Publications of Department of Research Technology

Involved institute: Department of Research Technology
"Online First" included
Without submitted and only approved publications
Only approved publications

173 Publications
Status report of Super-SIMS for resource technology
Rugel, G.; Akhmadaliev, S.; Belokonov, G.; Böttger, R.; von Borany, J.; Gutzmer, J.; Kaever, P.; Meyer, M.; Noga, P.; Renno, A. D.ORC; Scharf, A.; Tiessen, C. J.; Voigtländer, J.; Wagner, N.; Wiedenbeck, M.; Winter, A.; Wu, H. S.; Ziegenrücker, R.
Abstract: The combination of an ion source with very good spatial resolution with a tandem accelerator is a long standing idea to improve the sensitivity by orders of magnitude [1-3]. Translating this idea to reality has its challenges [e.g. 4-6]. Having a strong focus on natural, metal, and mineral resources the Helmholtz Institute Freiberg for Resource Technology installed such a system at the Ion Beam Centre at HZDR. This so-called Super-SIMS will be embedded into a system of consecutive micro-analytical methods devoted to the characterization of minerals and ores.
The secondary ion beam of the SIMS (CAMECA IMS 7f-auto) is injected into the pre-existing Dresden Accelerator Mass Spectrometry facility [7,8] which removes isobaric molecular signatures in the ion beam. The SIMS component remains as an autonomous analytical instrument with the additional option/advantage to inject the negative secondary ion beam at energies of up to 40 keV (to match the acceptance conditions) into the accelerator. A dedicated ion optical unit has been constructed and installed to focus the ion beam to the accelerator entrance.
First measurements of the performance parameters will be presented. We analyzed several matrices and mass ranges of isotopes like a P-doped Si-wafer, natural galena (PbS) and the elements between Ga and As in several natural and synthetic matrices.

[1] Purser et al. Surface and Interface Analysis 1(1), 1979, 12. [2] J. M. Anthony, D. J. Donahue, A. J. T. Jull, MRS Proceedings 69 (1986) 311-316. [3] S. Matteson, Mass Spectrom. Rev., 27 (2008) 470. [4] Ender et al. NIMB 123 (1997) 575. [5] Maden, PhD thesis, ETH Zurich 2003. [6] Fahey et al. Analytical Chemistry 88(14), 2016, 7145. [7] Akhmadaliev et al., NIMB 294 (2013) 5. [8] Rugel et al. NIMB 370 (2016) 94.
Keywords: Super-SIMS
  • Invited lecture (Conferences)
    23rd International Conference on Ion Beam Analysis IBA-2017, 08.-13.10.2017, Shanghai, China

Registration No. 25935 - Permalink


Status of the progress at the Dresden Super-SIMS
Rugel, G.; Akhmadaliev, S.; Belokonov, G.; Böttger, R.; von Borany, J.; Gutzmer, J.; Kaever, P.; Meyer, M.; Noga, P.; Renno, A. D.; Scharf, A.; Tiessen, C. J.; Voigtländer, J.; Wagner, N.; Wiedenbeck, M.; Winter, A.; Wu, H. S.; Ziegenrücker, R.
Abstract: The DREAMS (DREsden AMS) facility [1,2] has been proven to be very suitable for a number of applications. We are broadening our application scope by the implementation of a so-called Super-SIMS (SIMS = Secondary Ion Mass Spectrometry) device [3]. Our system combines the spatial resolution capability of a SIMS (CAMECA IMS 7f-auto) with the pre-existing DREAMS’s capability to remove isobaric molecular signatures in the ion beam. An improvement down to isotopic ratios of ~ 10-9 -10-12 is expected, i.e. an order of magnitude better than traditional dynamic SIMS (e.g. [4,5]).
To match the acceptance conditions of our 6 MV Tandetron accelerator, the SIMS device (providing an ion beam with 5 to 10 keV energy) can be raised to a potential of up to -30 kV. The connection between the SIMS device and the accelerator has been realized with a transition lens, which focusses the ion beam to the accelerator entrance. SIMS-extracted ion beams have already been successfully measured on the high-energy accelerator side detector.
First measurements were done with two matrices: a P-doped Si-wafer and a natural galena crystal (PbS). The wafer was analysed for all naturally occurring Si isotopes (28Si, 29Si, 30Si) as well as for 31P. Count rates for all of the aforementioned isotopes were measured. Galena was analysed for S isotopes (32S, 33S, 34S, 36S). We present ongoing developments, results, as well as plans to extend to other matrices and isotope systems. With more development this ultrasensitive analytical method could be best-suited for analysing geological samples within our resource technology focus.

[1] Akhmadaliev et al., NIMB 294 (2013) 5. [2] Rugel et al. NIMB 370 (2016) 94. [3] J. M. Anthony, D. J. Donahue, A. J. T. Jull, MRS Proceedings 69 (1986) 311-316. [4] Maden, PhD thesis, ETH Zurich 2003. [5] S. Matteson, Mass Spectrom. Rev., 27 (2008) 470.
Keywords: SIMS, Super-SIMS, Trace element AMS, galena
  • Poster
    The Fourteenth International AMS Conference (AMS 14), 14.-18.08.2017, Ottawa, Canada

Registration No. 25441 - Permalink


Development of a Super-SIMS for geological applications
Ziegenrücker, R.; Akhmadaliev, S.; Belokonov, G.; von Borany, J.; Böttger, R.; Gutzmer, J.; Kaever, P.; Meyer, M.; Noga, P.; Renno, A. D.; Rugel, G.; Scharf, A.; Tiessen, C. J.; Voigtländer, J.; Wagner, N.; Wiedenbeck, M.; Winter, A.; Wu, H. S.
Abstract: The DREAMS (DREsden Accelerator Mass Spectrometry) facility [1, 2] has been proven to be very suitable for a number of applications. We are broadening our application scope by the implementation of a so-called Super-SIMS (SIMS = Secondary Ion Mass Spectrometry) device [3]. Our system combines the spatial resolution capability of a SIMS (CAMECA IMS 7f-Auto) with the pre-existing DREAMS’s capacity to remove isobaric molecular signatures in the ion beam. An improvement down to ultra-trace element concentrations of 1 µg/g to 100 ng/g is expected, i.e. an order of magnitude better than traditional dynamic SIMS (see e.g. [4, 5]).
To match the acceptance conditions of our 6 MV Tandetron accelerator for all masses from 1 to 300 amu, the SIMS device (providing an ion beam with 5 to 10 keV energy) can be raised to a potential of up to -30 kV. The connection between the SIMS device and the accelerator has been realized with a transition lens, which focusses the ion beam to the accelerator entrance. SIMS-extracted ion beams have already been successfully measured on the high-energy accelerator side detector.
First measurements were done with two matrices: a P-doped Si-wafer and a natural galena crystal (PbS). The wafer was analysed for all naturally occurring Si isotopes (28Si, 29Si, 30Si) as well as 31P. Count rates for all of the aforementioned isotopes were measured. Galena was analysed for S isotopes (32S, 33S, 34S, 36S). We present ongoing developments, results, as well as plans to extend to other matrices and isotope systems. With more development this ultrasensitive analytical method could be best-suited for analysing geological samples within our resource technology focus.

[1] S. Akhmadaliev, et al., Nucl. Instrum. Meth. B 294, 2013, 5-10.
[2] G. Rugel, et al. Nucl. Instrum. Meth. B 370, 2016, 94-100.
[3] J. M. Anthony, D. J. Donahue, A. J. T. Jull, Mat. Res. Soc. Symp. Proc. 69, 1986, 311-316.
[4] C. Maden, PhD thesis, ETH Zurich, 2003.
[5] S. Matteson, Mass Spectrom. Rev. 27 (5), 2008, 470-484.
Keywords: SIMS, Super-SIMS, Trace element AMS, galena
  • Poster
    21st International Conference on Secondary Ion Mass Spectrometry - SIMS21, 10.-15.09.2017, Kraków, Poland

Registration No. 25437 - Permalink


The Common Data Acquisition Platform in the Helmholtz Association
Kaever, P.; Balzer, M.; Kopmann, A.; Zimmer, M.; Rongen, H.
Abstract: Various centres of the German Helmholtz Association (HGF) started in 2012 to develop a modular data acquisition (DAQ) platform, covering the entire range from detector readout to data transfer into parallel computing environments. This platform integrates generic hardware components like the multi-purpose HGF-Advanced Mezzanine Card or a smart scientific camera framework, adding user value with Linux drivers and board support packages. Technically the scope comprises the DAQ-chain from FPGA-modules to computing servers, notably frontend-electronics-interfaces, microcontrollers and GPUs with their software plus high-performance data transmission links. The core idea is a generic and component-based approach, enabling the implementation of specific experiment requirements with low effort. This so called DTS-platform will support standards like MTCA.4 in hard- and software to ensure compatibility with commercial components. Its capability to deploy on other crate standards or FPGA-boards with PCI express or Ethernet interfaces remains an essential feature. Competences of the participating centres are coordinated in order to provide a solid technological basis for both research topics in the Helmholtz Programme "Matter and Technology", "Detector Technology and Systems" and "Accelerator Research and Development". The DTS-platform aims at reducing costs and development time and will ensure access to latest technologies for the collaboration. Due to its flexible approach, it has the potential to be applied in other scientific programs.
Keywords: Data acquisition concepts; Software architectures (event data models, frameworks and databases); Detector control systems (detector and experiment monitoring and slow-control systems, architecture, hardware, algorithms, databases); Image reconstruction in medical imaging
  • Contribution to proceedings
    Topical Workshop on Electronics for Particle Physics (TWEPP2016), 26.-30.09.2016, Karlsruhe, Deutschland
    Journal of Instrumentation 12(2017),C04004: IOPscience
    DOI-Link: http://dx.doi.org/10.1088/1748-0221/12/04/C04004

Registration No. 25393 - Permalink


Single Bubble Dynamics during Subcooled Nucleate Boiling on a Vertical Heater Surface: An Experimental Analysis of the Effects of Surface Characteristics
Sarker, D.; Franz, R.; Ding, W.; Hampel, U.
Abstract: In the present experimental study we investigated the effects of surface characteristics, such as wettability and roughness, on nucleate boiling in de-ionized water at a vertical heater. In the experiments, bubbles were generated from an artificial nucleation site on a stainless steel heater surface. High-resolution optical imaging has been used to capture the bubble life cycle, that is, departure, sliding, and lift-off. We found, that the lower wettability leads to larger departure diameter, longer sliding and larger lift-off diameter of bubbles. Also surface roughness effects have been analyzed and it was found that bubble departure and lift-off diameters are smaller and departure period is longer for a smooth surface. Bubble sliding velocity was found faster for a rough surface compared to a smooth surface. It was also found that the roughness is very influential to bubble growth and departure, which can be explained by considering its interaction with the microlayer underneath the bubble. An “optimal roughness”, which accelerates the bubble growth, was found. The knowledge gained from this study shall be particularly useful to improve nucleate boiling models for numerical simulations.
Keywords: vertical heater; nucleate boiling; bubble dynamics; wettability; optimal roughness

Registration No. 24937 - Permalink


Gender Differences in Neural Networks for Color Processing in Mice: A PET/MR Study
Njemanze, P. C.; Kranz, M.; Amend, M.; Wehrl, H.; Brust, P.
Corresponding author: Brust, P.
Abstract: Color processing is a central component of mammalian vision. Gender-related differences of color processing revealed by non-invasive functional transcranial Doppler ultrasound suggested right hemisphere pattern for Blue/Yellow chromatic opponency by men, and a left hemisphere pattern by women. The present study measured the blood-flow related accumulation of [18F]fluorodeoxyglucose ([18F]FDG) in mouse brain using small animal positron emission tomography and magnetic resonance imaging (PET/MRI) with statistical parametric mapping during light stimulation with Blue and Yellow filters compared to darkness condition.
PET revealed a reverse pattern compared to previous human studies: Male mice presented with left visual cortex dominance for blueON-channels through the right eye, while female mice presented with right visual cortex dominance for blueON-channel through the left eye. We applied statistical parametric mapping (SPM) to examine gender differences in activated architectonic areas within the orbital and medial prefrontal cortex and their cortico-cortical connections and sub-cortical networks that lead to the striatum, medial thalamus and other brain areas. The connectivity evoked by Blue stimulation spread through a wide range of brain structures implicated in viscerosensory and visceromotor systems in the left intra-hemispheric regions in male mice, but in the right-to-left inter-hemispheric regions in female mice. Spatial and chromatic opponency was maintained using a yellowON-OFF push-pull interaction in male mice, but a blueON-ON push-forward interaction in female mice. Color functional ocular dominance plasticity was noted in the right eye in male mice but in the left eye in female mice. This animal model could be used in the study of color processing mechanisms and gender complementarity in normal and pathological brain conditions.

Registration No. 24464 - Permalink


Implementing High-Order FIR Filters in FPGAs
Födisch, P.; Bryksa, A.; Lange, B.; Enghardt, W.; Kaever, P.
Abstract: Contemporary field-programmable gate arrays (FPGAs) are predestined for the application of finite impulse response (FIR) filters. Their embedded digital signal processing (DSP) blocks for multiply-accumulate operations enable efficient fixed-point computations, in cases where the filter structure is accurately mapped to the dedicated hardware architecture. This brief presents a generic systolic structure for high-order FIR filters, efficiently exploiting the hardware resources of an FPGA in terms of routability and timing. Although this seems to be an easily implementable task, the synthesizing tools require an adaptation of the straightforward digital filter implementation for an optimal mapping. Using the example of a symmetric FIR filter with 90 taps, we demonstrate the performance of the proposed structure with FPGAs from Xilinx and Altera. The implementation utilizes less than 1% of slice logic and runs at clock frequencies up to 526 MHz. Moreover, an enhancement of the structure ultimately provides an extended dynamic range for the quantized coefficients without the costs of additional slice logic.
Keywords: digital filters, field-programmable gate arrays, FIR filters, fixed-point arithmetic

Downloads:

Registration No. 24197 - Permalink


Digital high-pass filter deconvolution by means of an infinite impulse response filter
Födisch, P.; Wohsmann, J.; Lange, B.; Schönherr, J.; Enghardt, W.; Kaever, P.
Abstract: In the application of semiconductor detectors, the charge-sensitive amplifier is widely used in front-end electronics. The output signal is shaped by a typical exponential decay. Depending on the feedback network, this type of front-end electronics suffers from the ballistic deficit problem, or an increased rate of pulse pile-ups. Moreover, spectroscopy applications require a correction of the pulse-height, while a shortened pulse-width is desirable for high-throughput applications. For both objectives, digital deconvolution of the exponential decay is convenient. With a general method and the signals of our custom charge-sensitive amplifier for cadmium zinc telluride detectors, we show how the transfer function of an amplifier is adapted to an infinite impulse response (IIR) filter. This paper investigates different design methods for an IIR filter in the discrete-time domain and verifies the obtained filter coefficients with respect to the equivalent continuous-time frequency response. Finally, the exponential decay is shaped to a step-like output signal that is exploited by a forward-looking pulse processing.
Keywords: Cadmium zinc telluride (CdZnTe,CZT) detector; Charge-sensitive amplifier; Digital pulse processing; Digital filter; Deconvolution; Field-programmable gate array (FPGA)

Downloads:

Registration No. 24196 - Permalink


Charge-sensitive front-end electronics with operational amplifiers for CdZnTe detectors
Födisch, P.; Berthel, M.; Lange, B.; Kirschke, T.; Enghardt, W.; Kaever, P.
Abstract: Cadmium zinc telluride (CdZnTe, CZT) radiation detectors are suitable for a variety of applications, due to their high spatial resolution and spectroscopic energy performance at room temperature. However, state-of-the-art detector systems require high-performance readout electronics. Though an application-specific integrated circuit (ASIC) is an adequate solution for the readout, requirements of high dynamic range and high throughput are not available in any commercial circuit. Consequently, the present study develops the analog front-end electronics with operational amplifiers for an 8x8 pixelated CZT detector. For this purpose, we modeled an electrical equivalent circuit of the CZT detector with the associated charge-sensitive amplifier (CSA). Based on a detailed network analysis, the circuit design is completed by numerical values for various features such as ballistic deficit, charge-to-voltage gain, rise time, and noise level. A verification of the performance is carried out by synthetic detector signals and a pixel detector. The experimental results with the pixel detector assembly and a 22Na radioactive source emphasize the depth dependence of the measured energy. After pulse processing with depth correction based on the fit of the weighting potential, the energy resolution is 2.2% (FWHM) for the 511 keV photopeak.
Keywords: Analogue electronic circuits; Front-end electronics for detector readout; Gamma detectors (scintillators, CZT, HPG, HgI etc)

Downloads:

Registration No. 24194 - Permalink


A synchronous Gigabit Ethernet protocol stack for high-throughput UDP/IP applications
Födisch, P.; Lange, B.; Sandmann, J.; Büchner, A.; Enghardt, W.; Kaever, P.
Abstract: State of the art detector readout electronics require high-throughput data acquisition (DAQ) systems. In many applications, e. g. for medical imaging, the front-end electronics are set up as separate modules in a distributed DAQ. A standardized interface between the modules and a central data unit is essential. The requirements on such an interface are varied, but demand almost always a high throughput of data. Beyond this challenge, a Gigabit Ethernet interface is predestined for the broad requirements of Systems-on-a-Chip (SoC) up to large-scale DAQ systems. We have implemented an embedded protocol stack for a Field Programmable Gate Array (FPGA) capable of high-throughput data transmission and clock synchronization. A versatile stack architecture for the User Datagram Protocol (UDP) and Internet Control Message Protocol (ICMP) over Internet Protocol (IP) such as Address Resolution Protocol (ARP) as well as Precision Time Protocol (PTP) is presented. With a point-to-point connection to a host in a MicroTCA system we achieved the theoretical maximum data throughput limited by UDP both for 1000BASE-T and 1000BASE-KX links. Furthermore, we show that the random jitter of a synchronous clock over a 1000BASE-T link for a PTP application is below 60 ps.
Keywords: Data acquisition circuits, Data acquisition concepts

Downloads:

Registration No. 23259 - Permalink


Ein VHDL basierter Gigabit Ethernet Protokollstapel für FPGAs
Födisch, P.; Lange, B.; Kaever, P.
Abstract: Mit diesem Beitrag wird ein Protokollstapel für einen ethernet-basierten Datenaustausch mit einem FPGA vorgestellt. Für den schnellen und verbindungslosen Datenaustausch ist das User Datagram Protocol (UDP) ein schlankes Protokoll der Transportschicht. Die dynamische Erzeugung der UDP Paketrahmen benötigt eine vollständige Abbildung der zugrunde liegenden Netzwerkschichten (Internetschicht und Netzwerkschicht). Es wird eine VHDL basierte Architektur für einen Protokollstapel vorgestellt, welche die Protokolle UDP, IP, ICMP und ARP in einem FPGA integriert. Der Schichtenaufbau soll den maximalen Datendurchsatz ermöglichen. Es werden die Ergebnisse der Implementierung und Tests auf unterschiedlichen FPGA Plattformen gezeigt.
  • Contribution to proceedings
    106. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2015, 02.-04.03.2015, Zeuthen, Deutschland, Hamburg: Verlag Deutsches Elektronen-Synchrotron, 978-3-935702-96-6, 52-76

Downloads:

Registration No. 23257 - Permalink


Don’t forget the wire
Bussmann, M.; Zacharias, M.; Schöne, S.; Jung, F.; Vogt, S.; Widera, R.; Lieber, S.; Konrad, U.; Kaever, P.; Bieberle, A.; Wagner, A.; Fiedler, F.
Abstract: Overview of HZDR DTS Activities in Parallel Data Analyis
Keywords: dts, data, analysis, parallel
  • Lecture (Conference)
    Matter and Technologies Kickoff Meeting, 23.-26.02.2015, Hamburg, Deutschland

Registration No. 23226 - Permalink


Primary and Secondary Beam Stabilization at the ELBE Accelerator Facility
Justus, M.; Jainsch, R.; Kirschke, T.; Lehnert, U.; Michel, P.; Seidel, W.
Abstract: Since 2003, ELBE operates as a user facility for fundamental research and life sciences, providing highly brilliant electromagnetic radiation in a broad spectral range, as well as particle beams. The driving source is a 40 MeV, 1 mA electron LINAC in cw mode, utilizing a 13 MHz pulsed thermionic gun and Tesla acceleration technology. Infrared light from two FELs between 3 and 280μm [1] is the foremost secondary radiation used at ELBE. For its applications, different demands in beam stability are put for successful experiments. Therefore, a feedback system for the electron beam position and energy in combination with IR beam intensity feedback using FPGA technology is under development. It is aimed at suppressing beam instabilities caused by thermal behaviour, microphonics and the 50 Hz mains frequency with upper harmonics. This article depicts hardware and software details of the measurement and feedback system and provides first performance results.
Keywords: ELBE, feedback, FEL, stability
  • Open Access LogoContribution to proceedings
    ICALEPCS 2009, 12.-16.10.2009, Kobe, Japan
    Proceedings of ICALEPCS 2009, Geneva: Jacow, 978-4-9905391-0-8
  • Lecture (others)
    ICALEPCS 2009, 12.-16.10.2009, Kobe, Japan

Registration No. 21787 - Permalink


High-field High-Repetition-rate sources for the Coherent THz Control of Matter
Green, B.; Kovalev, S.; Asgekar, V.; Geloni, G.; Lehnert, U.; Golz, T.; Kuntzsch, M.; Bauer, C.; Hauser, J.; Voigtlaender, J.; Wustmann, B.; Koesterke, I.; Schwarz, M.; Freitag, M.; Arnold, A.; Teichert, J.; Justus, M.; Seidel, W.; Ilgner, C.; Awari, N.; Nicoletti, D.; Kaiser, S.; Laplace, Y.; Rajasekaran, S.; Zhang, L.; Winnerl, S.; Schneider, H.; Schay, G.; Lorenzc, I.; Rauscher, A.; Radu, I.; Mährlein, S.; Kampfrath, T.; Wall, S.; Heberle, J.; Malnasi, A.; Cavalleri, A.; Steiger, A.; Müller, A. S.; Helm, M.; Schramm, U.; Cowan, T.; Michel, P.; Fisher, A. S.; Stojanovic, N.; Gensch, M.
Abstract: Ultra-short flashes of THz light with low quantum energies of a few meV, but strong electric or magnetic field transients have recently been employed to prepare various fascinating nonequilibrium states in matter. Here we present a new class of sources based on superradiant enhancement of radiation from relativistic ultra-short electron bunches in a compact electron accelerator that we believe will revolutionize experiments in this field. Our prototype source generates high-field THz pulses at unprecedented repetition rates up to the MHz regime. We demonstrate parameters that already exceed state of the art laser-based sources by more than 2 orders of magnitude. The parameters are scalable and once operational at their design parameters this type of sources will provide 1 MV/cm electric fields and magnetic fields in the few 100 mT regime at repetition rates of few 100 kHz.
Keywords: superradiance, coherent control, THz, High-field

Registration No. 21590 - Permalink


Fast Timing with BGO (and other Scintillators) on Digital Silicon Photomultipliers for Prompt Gamma Imaging
Petzoldt, J.; Roemer, K.; Kormoll, T.; Berthel, M.; Dreyer, A.; Enghardt, W.; Fiedler, F.; Hueso-Gonzalez, F.; Golnik, C.; Kirschke, T.; Wagner, A.; Pausch, G.
Abstract: Particle therapy is supposed to be an advanced treatment modality compared to conventional radiotherapy because of the well-defined range of the ions. Prompt gamma rays, produced in nuclear reactions between ion and nuclei, can be utilized for real-time range verification to exploit the full potential of particle therapy. Several devices have been investigated in the field of Prompt Gamma Imaging (PGI), like Slit and Compton Cameras. The latter need very high detection efficiency as well as good time and energy resolution, requiring a versatile scintillation detector. In positron emission tomography (PET), LSO and LYSO are known for their good timing resolution, while the lower cost alternative BGO shows worse performance. In PGI however, where gamma rays have energies up to 10 MeV, the light output of a scintillator is up to 20 times larger compared to PET with E gamma = 511 keV. This reduces the statistical contribution of the time resolution, which is the dominant part in case of BGO. Thus, BGO could be a reasonable alternative to LSO/LYSO for applications in PGI. Hence, experiments at the ELBE accelerator at Helmholtz-Zentrum Dresden Rossendorf (Germany) were performed using digital silicon photomultiplier (dSiPM) from Philips with monolithic BGO and LYSO crystals and for completeness with GAGG and CeBr3. The time resolution of BGO compared to the faster scintillators will be presented for a wide range of trigger- and validation levels as well as validation lengths of the dSiPM. Timing resolutions below 300 ps were obtained for BGO, while LYSO and CeBr3 achieve about 170 ps.
Keywords: fast timing, digital silicon photomultiplier, particle therapy, range verification
  • Lecture (Conference)
    2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (2014 NSS/MIC), 08.-15.11.2014, Seattle, USA
  • Contribution to proceedings
    2014 IEEE Nuclear Science Symposium and Medical Imaging Conference (2014 NSS/MIC), 08.-15.11.2014, Seattle, USA
    Proceedings of 2014 NSS/MIC

Registration No. 21473 - Permalink


Digital Pulse Processing for CdZnTe Detectors
Födisch, P.; Berthel, M.; Kormoll, T.; Hueso-González, F.; Lange, B.; Pausch, G.; Kaever, P.
Abstract: Segmented Cadmium Zinc Telluride (CdZnTe) detectors are promising candidates for a high resolution radiation detection system due to their good energy and spatial resolution. They are also well suited for medical imaging in a Compton camera application. This first Compton camera prototype is set up with a double sided strip detector in the scatter layer. Such an electrode layout enables a fast timing at the expense of efficiency losses. As a Compton camera needs an adequate number of valid scattering events with precise timing, a pixelated electrode layout performs best. The analog readout electronics for a 8 x 8 pixeldetector (20 x 20 x 5mm3) has been replaced by a digital FPGA-based system. All detector signals are sampled by charge sensitive preamplifiers with 100MS/s and 14 bit resolution. The pulse heights are extracted with an adjustable Moving Window Deconvolution in combination with a slow shaping IIR filter (Recursive Moving Average). To generate a trigger, we implemented a digital constant fraction discriminator (DCFD) on the fast shaped signal. This signal is derived by applying a FIR filter to the deconvoluted cathode signal. The algorithm uses a symmetric [−1, 1] coefficient structure for fast computation. Our results show that the accuracy of the DCFD can be improved by optimizing the filter length. Both algorithms for energy and timestamp calculation have been evaluated with measurements of a 22Na source and at the ELBE accelerator with a pulsed beam. The initial implementation results in an energy resolution of about 5% (FWHM at 511 keV) for a randomly selected pixel and a timing resolution better than 12 ns FWHM for all events up to 10MeV.
  • Poster
    Workshop on Range Assessment and Dose Verification in Particle Therapy, 29.-30.09.2014, Dresden, Deutschland

Downloads:

Registration No. 21376 - Permalink


Taktsynchronisierung und Zeitmessung in einem verteilten Datenerfassungssystem
Födisch, P.; Sandmann, J.; Lange, B.; Kaever, P.
Abstract: Die Zeitmessung mit einem verteilten Datenerfassungssystem erfordert die Synchronisierung der einzelnen Teilsysteme. Eine dedizierte Taktverteilung ist für diese Anwendung eine einfache und präzise Lösung, erfordert aber zusätzlichen Installationsaufwand und bereitet vor allem bei der Skalierung des Gesamtsystems Probleme. Stattdessen können auch die vorhandenen Datenlinks der einzelnen Module für eine Rückgewinnung des Systemtaktes verwendet werden. Hier wird gezeigt, wie mit industriellen Komponenten (FPGA und Gigabit-Ethernet PHY) die Synchronisierung auf eine gemeinsame Taktfrequenz realisiert wird. Der Abgleich der Uhren erfolgt anschließend protokollbasiert über die Ethernet-Schnittstelle. Es werden die hardwareseitigen Anforderungen, die Umsetzung sowie die experimentellen Ergebnisse vorgestellt. Das implementierte System erreicht Genauigkeiten im Sub-Nanosekunden Bereich mit einer 1000BASE-T Punkt-zu-Punkt Verbindung.
  • Open Access LogoContribution to proceedings
    105. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2014, 10.-12.03.2014, Geesthacht, Deutschland, Hamburg: Verlag Deutsches Elektronen-Synchrotron, 978-3-935702-85-0, 238-242

Downloads:

Registration No. 21015 - Permalink


Two Years Experience with the upgraded ELBE RF-System driven by 20 kW Solid State Amplifier Blocks
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: Since January 2012 the Superconducting CW Linac ELBE is equipped and in permanent operation with four 20 kW Solid State Amplifier Blocks. The poster gives an overview on the design of the new RF system and the experience gained within the first two years of operation.
Keywords: Solid State Power Amplifiers, Superconducting RF, ELBE-RF System,
  • Poster
    IPAC 2014 - 5th International Particle Accelerator Conference, 15.-20.06.2014, Dresden, Deutschland
  • Open Access LogoContribution to proceedings
    IPAC 2014 - 5th International Particle Accelerator Conference, 15.-20.06.2014, Dresden, Deutschland
    Proceedings of IPAC'14, CERN: JaCoW, MOPME067

Downloads:

Registration No. 20430 - Permalink


Status and Operating Experience of the ELBE RF System based on 10kW SSPAs
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntsch, M.; Lehnert, U.; Michel, P.; Staats, G.; Teichert, J.; Schurig, R.
Abstract: In January 2012 the 10 kW klystrons of the CW LINAC ELBE were replaced by pairs of 10kW solid state power amplifiers (SSPA).
The talk gives an overview on the SSPA based ELBE RF system. The experience gained during the first two years of operation is reviewed.
Keywords: SSPA, Solid State Power Amplifier, Superconducting Radio Frequency , Superconducting LINAC, RF-System for Particle Accelerators, 1.3GHz Power Aplifier,
  • Lecture (Conference)
    Continuous Wave and High Power RF Workshop 2014 (CWRF2014), 13.-16.05.2014, Trieste, Italy

Registration No. 20429 - Permalink


Upgrade of the Machine Interlock System for the ELBE Accelerator Facility
Justus, M.; Freitag, M.; Lange, B.; Michel, P.; Sorge, W.; Steinbrück, R.; Tietze, H.
Abstract: The ELBE facility with its 40 MeV C.W. LINAC has recently received an upgrade in terms of new secondary radiation sources and beam lines, while advancing the accelerator infrastructure towards 1.6 mA C.W. operation (1.0 mA before). Therefore, the machine interlock system (MIS) was in parts redesigned to meet the new timing requirements resulting from the increased overall beam power. It comprises fast beam loss detection and a PLC based equipment protection system (EPS), tripping the key components of the electron sources. The former tripping system using PLC interrupts was replaced by an in-house developed staggered CPLD based system with optical transmission and a PROFINET IO interface for control system integration. The EPS is distributed on several PLCs and has been improved in terms of M2M communication. Further, the vacuum inrush protection was completely renewed using brought-in equipment.
This contribution depicts the technical features and performance of the MIS subsystems, as well as the challenges posed by the project track of the ELBE upgrade during implementation.
Keywords: ELBE, MIS, Conrol System
  • Poster
    IPAC 2014 - 5th International Particle Accelerator Conference, 15.-20.06.2014, Dresden, Deutschland
  • Open Access LogoContribution to proceedings
    IPAC 2014 - 5th International Particle Accelerator Conference, 14.-20.06.2014, Dresden, Deutschland
    IPAC2014: Proceedings of the 5th International Particle Accelerator Conference, Geneva, Switzerland: JACoW, 978-3-95450-132-8, 469-471

Registration No. 19408 - Permalink


A New PSS for the ELBE Accelerator Facility
Justus, M.; Kösterke, I.; Kraft, S.; Michel, P.; Schramm, U.; Lenk, S.
Abstract: The ELBE facility (Electron Linear accelerator with high Brightness and low Emittance) is being upgraded towards a Center for High Power Radiation Sources in conjunction with Terawatt & Petawatt femtosecond lasers. The topological facility expansion and an increased number of radiation sources made a replacement of the former personnel safety system (PSS) necessary. The new system based on failsafe PLCs was designed to fulfil the requirements of radiation protection according to effective law, where it combines both laser and radiation safety for the new laser based particle sources. Conceptual design and general specification was done in-house, while detailed design and installation were carried out in close cooperation with an outside firm.
The article describes architecture, functions and some technical features of the new ELBE PSS. Special focus is on the implementation of IEC 61508 and the project track. The system was integrated in an existing (and mostly running) facility and is liable to third party approval. Operational experience after one year of run-time is also given.
Keywords: ELBE, PSS
  • Open Access LogoContribution to proceedings
    ICALEPCS 2013 - 14th International Conference on Accelerator & Large Experimental Physics Control Systems, 06.-11.10.2013, San Francisco, USA
    ICALEPCS2013: Proceedings of the 14th International Conference on Accelerator & Large Experimental Physics Control Systems, Geneva (Switzerland): JACoW / CERN, 978-3-95450-139-7, 191-194
  • Poster
    ICALEPCS 2013 - 14th International Conference on Accelerator & Large Experimental Physics Control Systems, 06.-11.10.2013, San Francisco, USA

Registration No. 19279 - Permalink


Measurements in a downscaled water-mockup and numerical simulations for the DRESDYN large scale precession dynamo experiment
Gundrum, T.; Wustmann, B.; Steglich, C.; Engel, H.; Stefani, F.; Gerbeth, G.; Albrecht, T.; Giesecke, A.; Nore, C.
Abstract: Precession has been discussed since long as a complementary energy source of homogeneous dynamo action. We delineate the present status of the preparations of the DRESDYN liquid sodium precession experiment, including numerical simulations, pressure measurements, velocity measurements, torque measurements and power measurements in a down scaled water mockup. Furthermore we give an overview about engineering and constructional aspects for the real sodium experiment.
Keywords: Dynamo, Precession, UDV, Sodium
  • Lecture (Conference)
    International Symposium on Geophysical and Astrophysical Dynamos, 07.-12.07.2013, Ascona, Switzerland

Registration No. 19271 - Permalink


Eine Ausleseelektronik für CZT-Detektoren mit dem RENA-3 IC von Nova R&D
Födisch, P.; Lange, B.; Kaever, P.
Abstract: Vorgestellt wird die Entwicklung einer kompakten Ausleseeinheit für CZT-Detektoren (Cadmiumzinktellurid) für die energieauflösende Spektroskopie von Gammastrahlung. Der von NOVA R&D verfügbare RENA-3 ASIC (Readout Electronics for Nuclear Applications) ist für den direkten Anschluss an die Detektoren vorgesehen und deckt so einen Großteil der analogen Funktionen ab. Im ASIC sind 36 konfigurierbare Eingangskanäle integriert, die mit ladungsempfindlichen Vorverstärkern und analoger Signalverarbeitung (pulse shaping) für CZT-Detektoren optimiert sind. Für die Ansteuerung des ASICs und die Verarbeitung der Ausgangssignale wurde eine digitale, FPGA-basierte Elektronik entwickelt. Die Konfiguration der Hardware wird mittels eines synthetischen Prozessors durch Software im FPGA und auf einem PC unterstützt. Gezeigt werden die Instrumentierung des Prototyps und die Ergebnisse der Kalibrierung des Gesamtsystems durch synthetische Detektorsignale in einer automatisierten Testumgebung. Mit dem entwickelten System werden der Messbereich, die Energieauflösung und das Zeitverhalten des ASICs untersucht und auf die geplante Anwendung mit CZT-Detektoren hin überprüft.
  • Open Access LogoContribution to proceedings
    104. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2013, 11.-13.03.2013, Jülich, Deutschland, Hamburg: Verlag Deutsches Elektronen-Synchrotron, 978-3-935702-72-0, 135-143

Registration No. 19183 - Permalink


Electron Bunch Diagnostic at the Upgraded ELBE Accelerator: Status and Challenges
Kuntzsch, M.; Findeisen, S.; Gensch, M.; Green, B. W.; Hauser, J.; Kovalev, S.; Lehnert, U.; Michel, P.; Roeser, F.; Schneider, C.; Schurig, R.; Kaya, C.; Al-Shemmary, A.; Bousonville, M.; Czwalinna, M. K.; Golz, T.; Schlarb, H.; Schmidt, B.; Schulz, S.; Stojanovic, N.; Vilcins, S.; Hass, E.
Abstract: Within the ELBE upgrade towards a Center for High Power Radiation Sources (HSQ), a mono energetic positron, a liquid lead photo neutron source and two new THz sources have been installed at the superconducting electron linac at ELBE. A variety of established as well as newly developed electron beam diagnostics were installed and tested. In this paper we want to present first results achieved with the currently existing prototype beam arrival time and bunch compression monitors (BAM, BCM) as well as one versatile EOS set-up. Based on these future developements and upgrades are discussed.
Keywords: ELBE Bunch Diagnostic
  • Lecture (Conference)
    International Beam Instrumentation Conference IBIC 2013, 16.-19.09.2013, Oxford, United Kingdom
  • Open Access LogoContribution to proceedings
    International Beam Instrumentation Conference IBIC 2013, 16.-19.09.2013, Oxford, United Kingdom
    Proceedings of IBIC 2013

Registration No. 19169 - Permalink


Simple transport system for solid targets
Franke, K.; Hauser, J.
Abstract: Reduction of the radiation dose during transfer of solid targets from the irradiation position of the cyclotron Cyclone 18/9
Keywords: cyclotron, target, transport system, radiation dose
  • Poster
    IBA User's Meeting 2013, 17.-19.06.2013, Hillerød, Denmark

Registration No. 18868 - Permalink


Optical Synchronization and Electron Bunch Diagnostic at ELBE
Kuntzsch, M.; Gensch, M.; Lehnert, U.; Roeser, F.; Schurig, R.; Bousonville, M.; Czwalinna, M. K.; Schlarb, H.; Schulz, S.; Vilcins, S.
Abstract: The continuous wave electron accelerator ELBE is upgraded to generate short and highly charged electron bunches (~100fs duration, up to 1 nC) . In the last years a prototype of an optical synchronization system using a mode locked fiber laser has been build up which is now in commissioning phase. The stabilized pulse train can be used for new methods of electron bunch diagnostics like bunch arrival time measurements with femtosecond resolution. At ELBE a Bunch arrival time monitor (BAM) has been designed and tested at the accelerator. The contribution will show the design of the BAM and some measurement results.
Keywords: Synchronization
  • Poster
    IPAC2013 - The 4th International Particle Accelerator Conference, 12.-17.05.2013, Shanghai, China
  • Open Access LogoContribution to proceedings
    IPAC2013 - The 4th International Particle Accelerator Conference, 12.-17.05.2013, Shanghai, China
    Proceedings of the 4th International Particle Accelerator Conference, 978-3-95450-122-9, 2932-2934

Registration No. 18814 - Permalink


Substitution of the Klystrons by Solid State Power Amplifiers (SSPA) at ELBE
Büttig, H.
Abstract: In January 2012 the 10 kW CW klystrons (CPI VKL7811St) used to operate the superconducting cavities of ELBE since 2001 have been replaced by pairs of 10 kW solid state amplifiers (SSPA) providing 20 kW RF power per cavity. The paper gives an overview on the activities and the problems during high power CW operation.
Keywords: ELBE RF-system, 1.3GHz SSPA, SC-LINAC RF Power Generation,
  • Lecture (Conference)
    ARD Workshop “Pushing the ELBE CW RF-system to high average beam current”, 14.-15.03.2013, Dresden, Deutschland

Registration No. 18718 - Permalink


Design and Performance of the Upgraded ELBE RF-System Based on Solid State Amplifiers
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: With the expansion of the radiation source ELBE, a centre for high power radiation sources is being built until 2014 at the Helmholtz Zentrum Dresden Rossendorf. One part of this program is to double the beam current of the ELBE LINAC. In January 2012 the 10 kW CW klystrons, used to operate the superconducting cavities of ELBE since 2001, had been replaced by a pair of 10 kW solid state amplifiers. The paper gives an overview on the activities around this project and the first experience with the new RF-system.
Keywords: ELBE RF system, Superconducting LINAC RF, 1.3 GHz Solid State Power Amplifiers, Solid State Poer Amplifiers for Particle Accelerators,
  • Invited lecture (Conferences)
    TIARA Workshop on RF Power Generation for Accelerators, 17.-19.06.2013, Uppsala, Schweden

Registration No. 18717 - Permalink


Commisioning of the upgraded superconducting linac ELBE
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: In January 2012 the 10 kW CW klystrons (CPI VKL7811St) used to operate the superconducting cavities of ELBE since 2001 have been replaced by pairs of 10 kW solid state amplifiers (SSPA) providing 20 kW RF power per cavity. The paper gives an overview on the activities and the problems during high power CW operation.
Keywords: Linac-RF, SSPA, High power solid state RF amplifiers, Accelerator RF systems, Superconducting Linac RF, CW Linac RF,
  • Open Access LogoContribution to proceedings
    4th International Particle Accelerator Conference, IPAC13, 12.-17.05.2013, Shanghai, China
    IPAC2013-Proceedings , Paper WEPME007, page 2935, Geneva: JACoW, 2935
  • Poster
    4th International Particle Accelerator Conference, IPAC13, 12.-17.05.2013, Shanghai, China

Registration No. 18715 - Permalink


Status of the Pulsed-Magnet-Development Program at the Dresden High Magnetic Field Laboratory
Zherlitsyn, S.; Wustmann, B.; Herrmannsdörfer, T.; Wosnitza, J.
Abstract: The Dresden High Magnetic Field Laboratory (HLD) is a pulsed-field user facility which offers to researches a variety of experimental techniques combined with non-destructive pulsed magnetic fields. Recently a new, 9.5 MJ dual-coil magnet has been commissioned. This magnet has achieved magnetic field of 91.4 T in a 16 mm bore and it is available for users now. In this paper, we report on some key upgrades in the magnet design which have led to breaking the 90 T limit at the HLD. Further possible design improvements are discussed. In addition, we share our operational experience obtained with the pulsed magnets.

Registration No. 17957 - Permalink


EtherCAT Feldbusknoten: Entwicklung, Systemunterstützung und -kompatibilität
Kaever, P.
Abstract: Die Verwendung selbst entwickelter Feldbusknoten und deren Einbindung in kommerzielle Automatisierungssysteme erfordert in der frühen Phase des Produktlebenszyklus einen erhöhten Entwicklungsaufwand. Nach erfolgreicher Integration bieten Hersteller von Automatisierungssystemen eine langfristig stabile und leistungsfähige Umgebung zur Projektierung und Programmierung von Anlagen, welche langfristig den Aufwand zur Pflege minimiert. Zur Überprüfung der Funktionsfähigkeit des Gesamtsystems ist die durch Testwerkzeuge unterstützte Systemkompatibilität eine entscheidende Voraussetzung. Die Vorgehensweise bei der Systemintegration eines Slave Device und der Prüfung der Systemkompatibilität wird im Folgenden vorgestellt.
Keywords: Fieldbus, slave devices, product life cycle, industrial Ethernet, EtherCAT, system integration, device test
  • Open Access LogoContribution to proceedings
    103. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2012, 12.-14.3.2012, Dresden, Deutschland
    103. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2012, ed.: Peter Göttlicher, 22607 Hamburg, Germany: Verlag Deutsches Elektronen-Synchrotron, 978-3-935702-65-2, 47-53
  • Lecture (Conference)
    103. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2012, 12.-14.3.2012, Dresden, Deutschland

Registration No. 17754 - Permalink


TELBE the coherent THz facility at ELBE: Enroute to naturally synchronized THz pump THz probe experiments beyond the 100 microjoule pulse energy limit
Gensch, M.; Seidel, W.; Stojanovic, N.; Hauser, J.; Lehnert, U.; Schneider, H.; Helm, M.; Michel, P.
Abstract: At the ELBE accelerator at the HZDR a new electron beamline, providing for femtosecond electron bunches with nC bunch charges and repetition rates in the 1 – 200 kHz regime is currently constructed. The 40 MeV electrons will be used in photon-electron interaction experiments with TW and PW class laser and for the generation of broad band and narrow bandwidth coherent THz pulses in the frequency range between 0.1 THz – 3 THz. Similar to previous work at FLASH the natural synchronization between light pulses generated by the same electron bunch shall be employed for fully synchronized experiments between narrow and broad band THz pulses as well as for novel electron bunch diagnostic (see also poster WEAP13). Pulse energies are expected to exceed the 100 μJ limit at scalable repetition rates between 1 and 200 kHz. The current status of the project and planned experiments are presented.
  • Poster
    33rd International Free Electron Laser Conference 2011, 22.-26.08.2011, Shanghai, China

Registration No. 17472 - Permalink


RF power upgrade at the superconducting 1.3 GHz CW LINAC “ELBE” with solid state amplifiers
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: The RF power for the superconducting CW LINAC has been doubled from 10 to 20 kW per cavity. In January 2012 the four 10 kW klystrons used to drive the four superconducting cavities of the LINAC have been replaced by a pair of 10 kW solid state power amplifiers. ELBE is now worldwide the first 1.3 GHz CW LINAC equipped with Solid State RF Power Amplifiers. This technical note details on this project.
Keywords: Solid state RF power amplifiers, Superconducting CW RF, 1.3 GHz Solid state RF-power amplifiers, ELBE-RF, Superconducting LINAC RF.

Registration No. 17265 - Permalink


DRESDYN - a new facility for MHD experiments with liquid sodium
Stefani, F.; Eckert, S.; Gerbeth, G.; Giesecke, A.; Gundrum, T.; Steglich, C.; Weier, T.; Wustmann, B.
Abstract: The DREsden Sodium facility for DYNamo and thermohydraulic studies (DRESDYN) is intended as a platform both for large-scale experiments related to geo- and astrophysics as well as for experiments related to thermohydraulic and safety aspects of liquid metal batteries and liquid metal fast reactors. The most ambitious projects in the framework of DRESDYN are a homogeneous hydromagnetic dynamo driven solely by precession and a large Taylor--Couette type experiment for the combined investigation of the magnetorotational instability and the Tayler instability. In this paper, we give a short summary about the ongoing preparations and delineate the next steps for the realization of DRESDYN.
  • Magnetohydrodynamics 48(2012)1, 103-113

Registration No. 17216 - Permalink


First Experience at ELBE with the new 1.3 GHz CW RF-System based on 10kW Solid State Amplifiers
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: With the expansion of the radiation source ELBE, a centre for high power radiation sources is being built between 2009 and 2014 at the Helmholtz Zentrum Dresden Rossendorf. One part of this program is to increase the beam current of the ELBE LINAC. In January 2012 each of the 10kW CW klystrons used to operate the superconducting cavities of ELBE since 2001 had been replaced by a pair of 10kW solid state amplifiers.The talk gives an overview on the new RF-system of ELBE and its performance.
Keywords: ELBE RF Solid State Power Amplifier 10 kW 1300MHz 10kW SSPA 1300MHz Superconducting Linac RF SSPA SSPA 10 kW
  • Lecture (Conference)
    CWRF2012,The Seventh CW and High Average Power RF Workshop, 07.-11.05.2012, Port Jefferson, NY, USA

Registration No. 17189 - Permalink


Status of the Femtosecond Synchronization System at ELBE
Kuntzsch, M.; Buechner, A.; Gensch, M.; Lehnert, U.; Roeser, F.; Bock, M. K.; Bousonville, M.; Felber, M.; Lamb, T.; Schlarb, H.; Schulz, S.; Sydlo, C.
Abstract: The superconducting electron accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently upgraded to enable continuous wave operation with bunch charges of up to 1 nC and durations down to 200 fs (RMS). The new beamline will drive a THz source and an X-ray source based on Thomson scattering. In collaboration with DESY, Hamburg, an optical synchronization system based on a mode locked master laser is currently being set up to ensure timing stability on the few 10 fs level. It allows high temporal resolution pump-probe experiments and new electron beam diagnostics like bunch arrival-time monitors. The synchronization system is assembled in a dedicated laboratory to ensure stable environmental conditions. In this paper the concept of the optical synchronization system is presented and first experience on the link stabilization system, its installation and commissioning is reported.
Keywords: Synchronization ELBE
  • Lecture (Conference)
    Beam Instrumentation Workshop (BIW12), 15.-19.04.2012, Newport News, USA
  • Open Access LogoContribution to proceedings
    Beam Instrumentation Workshop (BIW12), 15.-19.04.2012, Newport News, USA
    Status of the Femtosecond Synchronization System at ELBE

Registration No. 17098 - Permalink


20 kW Upgrade of the ELBE 1.3 GHz CW RF-System with BRUKER 10kW Solid State Amplifiers
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: Summary:
With the expansion of the radiation source ELBE, a centre for high power radiation sources is being built between 2009 and 2014 at the Helmholtz Zentrum Dresden Rossendorf. One part of this program is to increase the beam current of the ELBE LINAC. In January 2012 each of the 10kW CW klystrons used to operate the superconducting cavities of ELBE since 2001 had been replaced by a pair of 10kW solid state amplifiers.The talk gives an overview on the new RF-system of ELBE and its performance.
Keywords: Superconducting LINAC, 1.3GHz RF-System, Solid State RF-Power Amplifiers, 10kW RF Power, 10 kW RF SSPA, Turnkey SSPA, ELBE-RF System, ELBE-UPGRADE, HSQ,
  • Lecture (others)
    Eingeladener Vortrag KEK Tsukuba/Japan, 17.04.2012, KEK, Tsukuba, Japan

Registration No. 16988 - Permalink


Beam Loss Monitoring and Machine Protection at the ELBE CW Accelerator
Teichert, J.; Büchner; A.; Justus, M.; Lehnert, U.; Michel, P.; Schurig, R.
Abstract: The superconducting CW linac of the ELBE facility produces an electron beam up to 40 MeV and 1 mA average current. The beam is used to drive two IR FELs and target stations for production of bremsstrahlung, neutrons, and positrons. An upgrade of the ELBE facility is ongoing which includes an increase of beam current as well as new experimental opportunities such as the production of broadband THz radiation and the interaction of electrons with high power laser beams. The high beam power requires a fast and safe machine protection system. It was found that a continuous beam loss of about 10 µA or a total beam loss for longer than 2 ms produce damage. The beam loss at ELBE is monitored by two systems: beam loss monitors measuring the radiation in cable-like ionization chambers along the beamline, and beam current difference measurement system based on stripe line beam position monitors.
Keywords: Superconducting Linac, Beam Loss, Machine Protection, Ionization Chamber, Beam Position Monitor
  • Lecture (Conference)
    ERL 2011, The 50th ICFA Advanced Beam Dynamics Workshop on Energy Recovery Linacs, 16.-21.10.2011, Tsukuba, Japan

Registration No. 16583 - Permalink


Entwicklung von Feldbusknoten für den wissenschaftlichen Gerätebau
Kaever, P.
Abstract: Mit der Entwicklung spezialisierter Feldbusknoten lässt sich eine für den wissenschaftlichen Gerätebau in vielen Fällen sinnvolle Aufteilung zwischen selbst entwickelten und kommerziell verfügbaren Komponenten unter konsequenter Nutzung vorhandener Automatisierungssysteme erreichen. Im Folgenden wird vorgestellt, welche Schritte dabei erforderlich sind und welche Möglichkeiten sich mit diesem Ansatz ergeben.
Keywords: Automatisierung, Feldbus, Feldbusgeräte, wissenschaftlicher Gerätebau
  • Open Access LogoContribution to proceedings
    102. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2011, 21.-23.03.2011, Darmstadt, Deutschland
    Peter Göttlicher (DESY): 102. Tagung der Studiengruppe elektronische Instrumentierung im Frühjahr 2011, Hamburg: Deutsches Elektronen-Synchrotron, 978-3-935702-58-4, 213-223

Registration No. 16454 - Permalink


Temperature Measurement in Ultra-Short Annealing Processes
Reichel, D.; Skorupa, W.; Schumann, T.
Abstract: Industrial demands for short process times at low cost are steadily increasing. Considerable attention is thereby drawn to ultra-short annealing cycles on the order of just a few milliseconds. Flash Lamp Annealing allows for directed thermal treatment of surfaces within just a few milliseconds without or with drastically reduced thermal stress of the bulk material. Due to the selected wavelength range in the visible and near infrared region the lightpulse is absorbed by the near-surface layers and diffusion into the bulk is limited by the ultrashort time span. Thereby temperatures up to 2000°C are achieved dependent on the energy of the lightpulse and the optical properties of the sample. Cooling takes place by heat conduction into the bulk. To control the annealing process a precise temperature measurement is required that can filter the intense background radiation to obtain the true wafer temperature from its thermal radiation. A new method for temperature measurement will be presented which imposes a modulation on the lamp radiation to extract the true wafer signal.
Keywords: Flash Lamp Annealing, Ultra-Short Annealing, Temperature Measurement, Ripple Pyrometry
  • Lecture (Conference)
    Subsecond Thermal Processing of Advanced Materials, 25.-27.10.2011, Dresden, Deutschland

Registration No. 16424 - Permalink


Aus alt mach neu – Ripple Pyrometrie für die Blitzlampenausheilung
Reichel, D.; Skorupa, W.; Schumann, T.
Abstract: Dieser Vortrag befasst sich mit der Temperaturmessung in der Kurzzeitausheilung. Dazu werden die besonderen Anforderungen an die Temperaturmessung in Kurzzeitausheilungsprozessen beleuchtet und historische Lösungen vorgestellt, darunter auch die Ripple Pyrometrie. Letztere wird seit Mitte der Neunziger Jahre erfolgreich für Heißprozesse im Sekundenbereich angewandt. Den Autoren ist es gelungen, diese Methode für Prozesse im Millisekundenbereich (Blitzlampenausheilung) umzusetzen. Experimentelle Ergebnisse werden vorgestellt und hinsichtlich ihres Einflusses auf den Gesamtfehler der Messung analysiert.
Keywords: Ultra-Short Annealing, Temperature Measurement, Ripple Pyrometry, Flash Lamps
  • Lecture (Conference)
    Nutzertreffen Heißprozesse, 23.-24.11.2011, Blaubeuren, Deutschland

Registration No. 16423 - Permalink


Elektronik für einen Strahllagemonitor (BPM)
Büchner, A.
Abstract: Die geplante Elektronik für einen neuen Strahllagemonitor (BPM) an ELBE wird vorgestellt. Der neue Strahllagemonitor soll einen wesentlich höheren Dynamikbereich haben und gleichzeitig die alten Differenzstrommonitore (DCM) ablösen. Dazu werden die einzelnen Signale vom Stripline-Monitor aufbereitet, digitalisiert und in einem FPGA verarbeitet. Die Strahllage und der Strahlstrom werden bestimmt und sowohl analog wie auch digital ausgegeben. Die Differenz des Strahlstromes zweier Strahllagemonitore wird gebildet und für das Maschinenschutzsystem überwacht.
Keywords: ELBE; Beam Position Monitor; BPM; Stripline-Monitor; Differential Current Monitor; DCM;
  • Invited lecture (Conferences)
    102. Tagung der Studiengruppe elektronische Instrumentierung, 21.-23.03.2011, Darmstadt, Deutschland

Registration No. 16334 - Permalink


Concept of Femtosecond Timing and Synchronization Scheme at ELBE
Kuntzsch, M.; Buechner, A.; Gensch, M.; Jochmann, A.; Kirschke, T.; Lehner, U.; Roeser, F.; Bock, M. K.; Bousonville, M.; Felber, M.; Lamb, T.; Schlarb, H.; Schulz, S.
Abstract: The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is undergoing an extension to offer capacity for various applications. The extension includes the setup of a THz-beamline with a dedicated laboratory and a beamline for electron-beam - high-power laser interaction. The current synchronization scheme offers stability on the picoseconds level. For pump-probe experiments using optical lasers, the desired synchronization between the pump and the probe pulse should be on the femtosecond scale. In the future there will be an optical synchronization system with a pulsed fiber laser as an optical reference. The laser pulses will be distributed over stabilized fiber links to the remote stations. It is planned to install EOM-based beam arrival time monitors (BAMs) in order to monitor the bunch jitter and to establish a beam-based feedback to reduce the jitter. Besides that, the timing system has to be revised to generate triggers for experiments with low repetition rate, two electron guns (thermionic DC, superconducting RF) and several lasers. The Poster will show the possible layout of the future Timing and Synchronization System at ELBE.
Keywords: Synchronization Timing ELBE
  • Open Access LogoContribution to proceedings
    International Particle Accelerator Conference, 04.-09.09.2011, San Sebastian, Spain
    Concept of Femtosecond Timing and Synchronization Scheme at ELBE
  • Poster
    International Particle Accelerator Conference, 04.-09.09.2011, San Sebastian, Spain

Registration No. 16283 - Permalink


Future Timing and Synchronization Scheme at ELBE
Kuntzsch, M.; Buechner, A.; Lehnert, U.; Roeser, F.
Abstract: The Radiation Source ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently extended to oer capacity for new experiments. The reconstruction includes the setup of a THz-beamline with a dedicated user laboratory and a beamline for electron-beam - high-power laser experiments. The current synchronization scheme oers stability to the picoseconds level. The newexperiments require a femtosecond synchronization in order to get field-strength resolved THz-probes and to have a stable overlap between the electron-bunches with the laser pulses. In the future there will be a MIT/Desy-like System with a pulsed fiber laser as an optical reference oscillator. The laser pulses will be distributed over stabilized fiber links to the remote stations. Later on it is planned to install EOM-based beamarrival timemonitors (BAMs) in order tomonitor the bunch jitter and to establish a feedback system to reduce the jitter. Besides that, the timing system has to be revised to trigger experiments with lowrepetition rate, two guns (thermionic DC, superconducting RF) and lasers. The Posterwill showthe Layout of the possible future Timing and Synchronization System at ELBE.
Keywords: Timing Synchronization ELBE
  • Open Access LogoContribution to proceedings
    DIPAC2011 - Beam Diagnostics and Instrumentation for Particle Accelerators, 16.-18.05.2011, Hamburg, Germany
    Future Timing and Synchronization Scheme at ELBE
  • Poster
    DIPAC2011 - Beam Diagnostics and Instrumentation for Particle Accelerators, 16.-18.05.2011, Hamburg, Germany

Registration No. 16281 - Permalink


The ELBE Control System – 10 Years of Experience with Commercial Control, SCADA and DAQ Environments
Justus, M.; Herbrand, F.; Jainsch, R.; Kretzschmar, N.; Leege, K.-W.; Michel, P.; Schamlott, A.
Abstract: The electron accelerator facility ELBE is the central experimental site of the Helmholtz-Zentrum Dresden-Rossendorf, Germany. Experiments with Bremsstrahlung started in 2001 and since that, through a series of expansions and modifications, ELBE has evolved to a 24/7 user facility running a total of seven secondary sources including two IR FELs. As its control system, ELBE uses WinCC on top of a networked PLC architecture. For data acquisition with high temporal resolution, PXI and PC based systems are in use, applying National Instruments hardware and LabVIEW application software. Machine protection systems are based on in-house built digital and analogue hardware. An overview of the system is given, along with an experience report on maintenance, reliability and efforts to keep track with ongoing IT, OS and security developments. Limits of application and new demands imposed by the forthcoming facility upgrade as a centre for high intensity beams (in conjunction with TW/PW femtosecond lasers) are discussed.
Keywords: ELBE, control system,
  • Contribution to proceedings
    ICALEPCS 2011 - 13th International Conference on Accelerator and Large Experimental Physics Control Systems, 10.-14.10.2011, Grenoble, France
    Proceedings of the ICALEPCS 2011
  • Poster
    ICALEPCS 2011 - 13th International Conference on Accelerator and Large Experimental Physics Control Systems, 12.10.2011, Grenoble, France

Downloads:

Registration No. 16161 - Permalink


16 kW Upgrade of the 1.3 GHz ELBE RF-System with Solid State Amplifiers
Büttig, H.; Arnold, A.; Büchner, A.; Justus, M.; Kuntzsch, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: The superconducting CW- LINAC (1.3 GHz) of the radiation source ELBE is in permanent operation since May 2001/1/. In 2011 an upgrade program of ELBE is in progress to support additional applications. One part of the program is to double the RF-power per cavity to at least 16 kW. Since we started ELBE in May 2001 substantial progress was made in all fields contributing accelerator science. As far as RF-amplifier technology is concerned IOT-based and Solid State Amplifiers compete with klystrons. To prepare for the power upgrade of ELBE we developed a couple of activities, like:
Test of the ELBE RF-couplers and waveguide windows
Test of an available 30 kW IOT amplifier with beam
Test of a 10 kW solid state amplifier (SSPA) with beam
Test of two 10 kW SSPA’ s with beam
Redesign of the Low level RF controller
Redesign of the technical water cooling.
Keywords: LINAC RF ELBE RF 1300 MHz Solid State Power Amplifiers 1,3 GHz SSPA SC LINAC Power RF LINAC RF IOT Paralleling Solid State Power Rf Amplifiers
  • Open Access LogoContribution to proceedings
    IPAC 2011 (Second International Particle Accelerator Conference), 04.-09.09.2011, San Sebastian, Spain
    16 kW Upgrade of the 1.3 GHz ELBE RF-System with Solid State Amplifiers: JACoW, 379-381
  • Poster
    IPAC 2011, 04.-09.09.2011, San Sebastian, Spain

Registration No. 15967 - Permalink


Modellexperimente mit Flüssigmetallen
Gundrum, T.; Kretzschmar, N.; Leege, K.-W.; Stefani, F.; Timmel, K.; Wondrak, T.; Gerbeth, G.; Herbrand, F.
Abstract: Eine Übersicht über das Forschungszentrum und die Abteilung Magnetohydrodynamik soll die Zuhörer auf die Aufgaben für die Prozessautomation in der Forschung einstimmen. Die Prozessautomation bei Modellexperimenten mit Flüssigmetallen ist mannigfaltig und weicht durch die Versuchsanordnung stark von einer industriellen Prozessautomation ab. Hardwareseitig werden PC's und ADSP Systeme eingesetzt. Angepasst an vorhandenes Know-How werden die Systeme mit Fortran, C++, LabView und AdBasic programmiert. Anhand des Rigaer Dynamo Experimentes, der kontaklosen Strömungstomografie (CIFT) und der Strangguss-Modellanlage (LIMMCAST) wird der Herangehensweise und Ergebnisse erleutert.
Keywords: MSR, MHD, DYNAMO, CIFT, CONCAST, LabView
  • Invited lecture (Conferences)
    5. Technologietag Prozessautomation, 06.05.2010, Chemnitz, Deutschland

Registration No. 14035 - Permalink


P0706 - Gittersensor
Schleicher, E.; Sühnel, T.; Boden, D.; Fischer, F.; Futterschneider, H.
Abstract: Aufgabe der vorliegenden Erfindung ist es, einen Gittersensor vorzuschlagen, mit dem der Aufwand des Fertigungsprozesses sowie die Einbau- und Betriebskosten für den Gittersensor deutlich verringert und die Haltbarkeit sowie Druck- und Temperaturfestigkeit des Gittersensors gegenüber bisherigen Gittersensoren deutlich erhöht werden können.
Die technische Lösung beinhaltet im Wesentlichen, dass vom Rand des Messquerschnitts (2) aus Kanäle (3) mit einer Breite von mehr als dem Durchmesser der Drahtelektroden (6) und mit einer Tiefe von weniger als der halben Dicke der Sensorplatine (1) in dieser nach außen verlaufen, dass die Kanäle (3) mit einer Metallschicht (5) ausgekleidet sind, dass die Drahtelektroden (6) mit ihren beiden Enden jeweils in einem der gegenüberliegenden Kanäle (3) an der Peripherie des Messquerschnitts (2) eingelegt und in den Kanälen (3) mittels leitfähiger Verschlussmasse (8) fixiert sind, dass die leitfähige Verschlussmasse (8) in jedem Kanal (3) mit der Oberseite der Sensorplatine (1) plan abschließt und dass die Sensorplatine (1) zwischen zwei Spannplatten (10) eingespannt ist.
Fig. 2
  • Patent
    DE102007019926 - Erteilung: 09.04.2009, Nachanmeldungen: WO, EP (validiert in 12 Ländern), US

Registration No. 12695 - Permalink


The detector system for measurement of multiple cosmic muons in the central detector of KASCADE
Bozdog, H.; Elzer, M.; Gils, H.; Haungs, A.; Herm, F.; Koepernik, H.; Kohler, K.; Kretschmer, M.; Leibrock, H.; Mathes, H.; Petcu, M.; Proehl, D.; Rebel, H.; Wentz, J.; Wolf, A.; Zagromski, S.
Abstract: A detector system for directional and time correlation measurements of multiple cosmic muons has been set up within the extensive air shower experiment KASCADE. The system consists of two layers (129 m(2) area each) of position-sensitive multiwire proportional chambers (MWPC) triggered by a layer of segmented plastic scintillation counters placed upon an iron/concrete shielding above the MWPCs. Operation conditions and performance of the MWPCs have been studied by means of a prototype arrangement consisting of a stack of four detectors and two trigger layers. Results of the detailed prototype studies are presented and discussed. In particular, it has been found that for the present purposes an operation with a commonly used argon-methane gas mixture instead of previously used argon-isobutane leads to an excellent performance. The chambers are integrated into the KASCADE experiment as described and are in continuous operation since 1996. Some typical measurements with the full detector assembly are used to illustrate which features of extensive air showers can be studied. (C) 2001 Elsevier Science B.V. All rights reserved.
Keywords: multiwire proportional chambers; data processing; extensive air showers; cosmic muons; extensive air showers;
  • Nuclear Instruments and Methods in Physics Research A 465(2001)2-3, 455-471

Registration No. 12321 - Permalink


Study of the ELBE RF-couplers with a new 1.3 GHz RF- coupler test bench driven by a resonant ring
Büttig, H.; Arnold, A.; Büchner, A.; Freitag, M.; Krätzig, M.; Lehnert, U.; Michel, P.; Schurig, R.; Staats, G.; Teichert, J.; Voigtländer, J.; Winter, A.
Abstract: To study the performance of the ELBE RF-couplers until their limits a 1.3 GHz resonant ring driven by a 10 kW CW klystron (VKL7811St, CPI) has been built to operate a RF-coupler and RF-window test bench. The ring allows tests with RF power up to 100 kW in continuous wave (CW) mode and 200 kW in pulsed mode.
Details of the resonant ring, the test bench design and results of the ELBE RF-coupler tests will be presented.
Keywords: RF power couplers, Superconducting CW RF, Resonant Ring, Travelling wave resonator, Waveguide window, RF test bench, Linac RF-system.

Registration No. 12096 - Permalink


A High Resolution Time-of-Flight Spectrometer for Fission fragments and Ion beams
Kosev, K. M.
Abstract: Thesis For the purpose of fission-fragment detection a double time-of-flight (TOF) spectrometer has been developed. The key component of the spectrometer is a TOF detector consisting of multichannel-plate (MCP) detectors with a position-sensitive readout, a foil for secondary electron production and an electrostatic mirror. The spectrometer performance is tested at tandem and superconducting linear accelerator.
  • Other report
    Dissertation: Technische Universität Dresden, 2009
    119 Seiten

Registration No. 12023 - Permalink


Three years of cw-operation at FELBE - Experiences and applications
Seidel, W.; Cizmar, E.; Drachenko, O.; Helm, M.; Justus, M.; Lehnert, U.; Michel, P.; Ozerov, M.; Schneider, H.; Schurig, R.; Stehr, D.; Wagner, M.; Winnerl, S.; Wohlfarth, D.; Zvyagin, S.; Kehr, S. C.; Eng, L. M.
Abstract: This paper reviews the basic properties of the infrared free-electron laser FELBE at the Forschungszentrum Dresden-Rossendorf. A few highlight experiments using the cw-operation are discussed. Driven by a superconducting linear accelerator, FELBE continuously generates infrared pulses with a repetition rate of 13 MHz. In addition, operation in a macropulse modus (pulse duration >100µs, repetition rate ≤ 25 Hz) is possible. At present FELBE delivers µJ pulses with typical duration of about 0.9-30 ps in the wavelength range 4-230 µm. Furthermore we give an outlook on the experiments will use the beam of FELBE in the High Magnetic Field Laboratory Dresden (HLD). The HLD will provide pulsed magnetic fields up to 60 T. It operates as a user facility since 2007.
  • Poster
    30th International Free Electron Laser Conference FEL 2008, 24.-29.08.2008, Gyeongju, Korea
  • Contribution to proceedings
    30th International Free Electron Laser Conference FEL 2008, 24.-29.08.2008, Gyeongju, Korea

Registration No. 11937 - Permalink


Commissioning and Test Results of the Superconducting RF Gun at ELBE
Teichert, J.; Arnold, A.; Büchner, A.; Büttig, H.; Janssen, D.; Justus, M.; Kamps, T.; Klemz, G.; Lehnert, U.; Matheisen, A.; Michel, P.; Murcek, P.; Schurig, R.; Staats, G.; Staufenbiel, F.; Xiang, R.; Will, I.
  • Lecture (Conference)
    Sixth PHIN Collaboration Meeting, 17.-18.07.2008, Lecce, Italy
  • Lecture (Conference)
    Seventh PHIN Collaboration Meeting, 02.-03.12.2008, Geneva, Switzerland

Registration No. 11546 - Permalink


Results of ELBE Window and Coupler Tests with a Resonant Ring
Büchner, A.; Büttig, H.; Schurig, R.; Staats, G.; Winter, A.
Abstract: A new test bench based on a resonant ring has been built at ELBE to run window as well as coupler tests. The resonant ring is driven by a 10 kW klystron and allows tests with RF power up to 100 kW in CW mode and about 200 kW in pulsed mode. Coupler tests are done with liquid Nitrogen cooling under almost real conditions. The results of warm window and coupler tests in pulsed and CW mode will be presented. Also details about the ring and a special designed coupler tip to rectangular waveguide transition are given.
Keywords: ELBE RF WINDOW COUPLER
  • Contribution to proceedings
    EPAC 2008, 23.-27.06.2008, Genua, Italy
    Proceedings of EPAC 2008, 978-92-9083-315-4

Registration No. 11445 - Permalink


Beam Diagnostics around the ELBE LINAC at FZD
Schurig, R.; Buechner, A.; Buettig, H.; Gabriel, F.; Jainsch, R.; Justus, M.; Lehnert, U.; Michel, P.; Proehl, D.; Schneider, Ch.; Teichert, J.
Abstract: The ELBE linear electron accelerator (LINAC) was put into operation in 2001. It now consists of a thermionic injector and two superconducting modules, each employing two niobium 9 cell TESLA type cavities. The LINAC is capable of accelerating 1 mA up to 40 MeV. The electron beam is used to generate various types of secondary radiation (IR, Bremsstrahlung, x-rays) and particle beams (neutrons, positrons). Being a multi purpose machine with high demands on beam precision and stability and given the high average cw beam power, sophisticated beam instrumentation and machine protection systems had to be developed. Systems and methods to measure beam position, -loss, -energy and -current, energy spread, bunch length and emittance are described in this paper.
  • Lecture (Conference)
    IEEE Dresden 2008, 19.-25.10.2008, Dresden, Deutschland

Registration No. 11435 - Permalink


Beam Stabilization at the ELBE electron accelerator and the FELBE infrared user facility
Jainsch, R.; Proehl, D.; Seidel, W.; Lehnert, U.; Justus, M.; Gabriel, F.; Michel, P.
Abstract: Abstract. The high current SRF electron accelerator facility ELBE started user operation at the Bremsstrahlung facility in 2003, followed straight-line by channelling X-rays and the infrared FEL laboratories. Since then, automated beam stabilization in terms of energy, intensity and also trajectory became a clear necessity for a number of experiments carried out. This contribution describes observed instabilities of the electron beam and the infrared beam at FELBE and alludes to their certain or possible sources. For slow (mHz) beam energy drift compensation, a dispersion based feedback loop was developed and implemented, using strip line beam position monitors and the accelerating RF gradient. Further, the IR beam intensity is measured by a newly developed scatter wire detector system and stabilized via the electron beam current up to the few Hz range. Control theory aspects used to design both solutions are shown, also their implementation into the existing ELBE control landscape and performance characteristics.
  • Lecture (Conference)
    IEEE Dresden 2008, 19.-25.10.2008, Dresden, Deutschland

Registration No. 11427 - Permalink


Resonant Ring Test Bench for Warm Window and Coupler Tests at ELBE.
Staats, G.; Buechner, A.; Buettig, H.; Michel, P.; Schurig, R.; Teichert, J.; Winter, A.
Abstract: A new coupler test bench based on a resonant ring has been built at ELBE in Dresden-Rossendorf to run warm window as well as coupler tests with RF power up to 190 kW (warm window tests up to 250kW) in CW operation. The ring is driven by a 10 kW klystron. This test bench also includes liquid nitrogen cooling of the ceramic cold window of the RF-coupler which allows testing under almost real conditions. A special waveguide to coupler transition was designed to match couplers with different antenna tips. At the beginning with the test bench it was possible to test the warm windows used at ELBE. It has been shown that the used warm windows are usable up to 70kW of CW-RF power with additional air cooling, much more than the 10kW CW used at ELBE. After this test the coupler used at the ELBE cryomodules was tested, in CW operation a power level of about 20kW was reached. More tests are in program and in near future some improvements are planned.
  • Lecture (Conference)
    Fifth CW and High Average Power RF Workshop, 25.-28.03.2008, Geneva, Switzerland

Registration No. 11210 - Permalink


CW Operation of the Superconducting LINAC "ELBE"
Buettig, H.; Arnold, A.; Buechner, A.; Gabriel, F.; Justus, M.; Lehnert, U.; Michel, P.; Schneider, C.; Schurig, R.; Staats, G.; Teichert, J.
Abstract: The superconducting CW-LINAC of the Radiation Source ELBE, based on 1.3 GHz-TESLA cavities, has been operational since 2001. An overview of the ELBE facility and of the RF-system of the superconducting CW-LINAC are presented. It is reported on different improvements on RF components to ensure stable operation of this user facility and on experience gathered during 7 years of CW- operation.
  • Lecture (Conference)
    Fifth CW and High Average Power RF Workshop 2008, 25.-28.03.2008, Geneva, Switzerland

Registration No. 11206 - Permalink


Prospects for Applications of Laser-Accelerated Particles
Schramm, U.; Sauerbrey, R.
Abstract: Invited talk on possible medical applications of laser accelerated particle beams
Keywords: laser ion acceleration, FELs
  • Invited lecture (Conferences)
    International Symposium on Ultrafast Intense Laser Science ISUILS 07, 24.-27.9.2007, Pisa, Italy

Registration No. 10986 - Permalink


Realisation of a prototype superconducting CW cavity and cryomodule for energy recovery
Mcintosh, P. A.; Bate, R.; Beard, C. D.; Cordwell, M.; Dykes, D. M.; Pattalwar, S.; Strachan, J.; Wooldridge, E.; Belomestnykh, S.; Liepe, M.; Padamsee, H.; Buechner, A.; Gabriel, F.; Michel, P.; Kimura, T.; Smith, T. I.; Byrd, J.; Corlett, J. N.; Li, D.; Lidia, S.
Abstract: For Energy Recovery applications, the requirement for high-Q accelerating structures, operating in CW mode, at large beam currents, with precise phase & amplitude stability and modest accelerating gradients are all fundamental in achieving intense photon fluxes from the
synchronised FEL insertion devices. Both Daresbury Laboratory and Cornell University are developing designs for advanced Energy Recovery Linac (ERL) facilities which require accelerating Linacs which meet such demanding criteria. The specification for the main ERL accelerator for both facilities dictates a modest accelerating gradient of 20 MV/m, at a Qo of better than 10^10, with a Qext of up to 10^8. A collaborative R&D
program has been set-up to design and fabricate a ‘proofof-principle’ cryomodule (which is well underway) that can be tested on ERLP at Daresbury and also on the Cornell ERL injector. This paper details the new cryomodule design, provides an insight to the design solutions employed and reports on the present status of the project.
Keywords: Elbe; accelerator ; cryomodule; energy recovery; accelerator RF;
  • Contribution to proceedings
    13th International Workshop on RF Superconductivity, 14.-19.10.2007, Beijing, China

Registration No. 10708 - Permalink


The IR-Beam Transport System from the ELBE-FELs to the User Labs
Seidel, W.; Grosse, E.; Justus, M.; Leege, K.-W.; Proehl, D.; Schlenk, R.; Winter, A.; Wohlfarth, D.; Wuensch, R.
Abstract: In the Forschungszentrum Dresden-Rossendorf, two free-electron lasers (FELs) have been put into operation. They produce laser light in the medium and the far infrared wavelength range (4-150 ìm). The IR ligh is transported to several laboratories in the same building and to the adjacent building of the High Magnetic Field Laboratory as well, where the experimental setups are up to 70maway from the FELs. Constructional peculiarities, the large wavelength range, the high average power in cw regime, and the beam property requirements of the users pose a challenge to the beam line design. The transport system includes vacuum pipes, diagnostic elements, plane and toroidal gold-covered copper mirrors, and exit windows. The designed transport system produces a beam waist at selected spots in each laboratory representing a magnified image of the outcoupling hole. Spot size and position are independent of the wavelength.
  • Poster
    29th International Free Electron Laser Conference FEL 2007, 26.-31.08.2007, Novosibirsk, Russia
  • Contribution to proceedings
    29th International Free Electron Laser Conference FEL 2007, 26.-31.08.2007, Novosibirsk, Russia
    Proceedings of FEL 2007

Registration No. 10657 - Permalink


Multimodality Imaging of Tumor Xenografts in Mice with dedicated Small-Animal PET, Small-Animal CT, and Small-Animal MRI: Hardware and Software Solutions
Bergmann, R.; Hauser, J.; Strobel, K.; Pötzsch, C.; Hofheinz, F.; Pietzsch, J.; Beuthien-Baumann, B.
Abstract: Dedicated small-animal tomographs are nowadays available for the three major modalities PET, MRI, and CT. Utilization of all three techniques for true multimodality imaging requires the solution of several technical problems including reproducible animal positioning, overcoming file format incompatibilities and coregistration of the different image volumes, preferably without application of markers.
Methods: We developed an isolation chamber and adapter for imaging devices, enabling physiologic animal control, reproducible positioning, pathogen barrier, anesthesia, probe application and the use of catheter systems. Furthermore, we developed the necessary software for file format conversions and coregistration of the image volumes.
The basis is the animal holder system, consisting of the fixing adapters and the animal chamber that could be positioned in our three tomographs (microPET P4, SkyScan 1178, and BioScan 70/30 USR).
The animal holder system is temperature-controled. It allows gas anesthesia of the animals and could be used as a closed system. The bed is air heated.
In the different modalities the data are stored in different formats using different image matrix and pixel sizes. In order to analyze the data they are converted to a common data format (Siemens ECAT7) and the pixel sizes are adjusted. Residual differences in the relative positioning of the animals are corrected via coregistration. We implemented a mutual information algorithm using the conjugate gradient maximization method.
Validation studies showed a good coregistration of the images from PET, CT, and MRI. In longitudinal [18F]FDG studies the coregistration allowed to compare the tumor SUVmax data between different studies.
Conclusion: Multimodality imaging of small animal PET, -CT, and MRI allows the direct comparison and quantification of regional PET, CT, and MRI/MRS parameters enabling the characterization of functional and anatomical changes during tumor development and therapy.
The project was partly supported by the EU project BioCare No. 505785.
Keywords: small-animal PET, CT, MRI ; multimodality imaging ; animal chamber ; coregistration ; mutual information algorithm
  • Poster
    Joint Molecular Imaging Conference 2007, 08.-11.09.2007, Providence, Rhode Island, USA

Registration No. 10088 - Permalink


The Control System of Strahlungsquelle ELBE at Forschungszentrum
Leege, K.-W.
Abstract: Technisches Seminar, DESY Zeuthen, 13.03.2007 Zeuthen
Keywords: Control System of Strahlungsquelle ELBE
  • Invited lecture (Conferences)
    The Control System of Strahlungsquelle ELBE at Forschungszentrum, 13.03.2007, Zeuthen, Deutschland

Registration No. 9971 - Permalink


Konzeption und prototypische Realisierung einer Datenbankanwendung für die Verwaltung von Betriebsparametern von Ionenstrahlbeschleunigern
Kunze, P.
Abstract: Es wird beschrieben, wie eine Datenbank für Betriebswerte eines Teilchenbeschleunigers aufgebaut wurde. Der Schwerpunkt der Betrachtungen liegt dabei auf der Theorie zum Aufbau einer solchen Datenbank.
  • Other report
    Dresden: HTW Dresden, Diplomarbeit, 2005
    50 Seiten

Registration No. 9890 - Permalink


Digitalisierung der Signalverarbeitung eines Rotorvoltmeters
Arnold, S.
Abstract: Das Ziel der Diplomarbeit war, auf Basis eines 32-Bit Mikrocontrollers wesentliche Teile der Signalverarbeitung eines Rotorvoltmeters von analoger Schaltungstechnik in eine digitale Verarbeitung zu überführen. Mit diesem Schritt kann das am Institut für Ionenstrahlphysik und Materialforschung des FZR eingesetzte Rotorvoltmeter eines Van-de-Graaff-Ionenbeschleunigers in seiner Anwendung wesentlich verbessert werden. Erwartet werden neben der einfacheren Parametrierung und der erhöhten Flexibilität des Gerätes vor allem auch eine Erhöhung der Stabilität im Betrieb durch den Wegfall von Drifterscheinungen analoger Schaltungstechnik.
  • Other report
    Chemnitz: TU Chemnitz, Diplomarbeit, 2006
    50 Seiten

Registration No. 9887 - Permalink


Digitalisierung der Funktion eines Meßgerätes zur Bestimmung der Beschleunigungsspannung von Van-de-Graaff-Ionenbeschleunigern
Voigtländer, G.
Abstract: Das Ziel der Diplomarbeit war, auf Basis eines 32-Bit Mikrocontrollers wesentliche Teile der Signalverarbeitung eines Rotorvoltmeters von analoger Schaltungstechnik in eine digitale Verarbeitung zu überführen. Mit diesem Schritt kann das am Institut für Ionenstrahlphysik und Materialforschung des FZR eingesetzte Rotorvoltmeter eines Van-de-Graaff-Ionenbeschleunigers in seiner Anwendung wesentlich verbessert werden. Erwartet werden neben der einfacheren Parametrierung und der erhöhten Flexibilität des Gerätes vor allem auch eine Erhöhung der Stabilität im Betrieb durch den Wegfall von Drifterscheinungen analoger Schaltungstechnik.
  • Other report
    Dresden: HTW Dresden, Diplomarbeit, 2004
    50 Seiten

Registration No. 9886 - Permalink


Comparison of different buncher cavity designs for the 4GLS ERLP
Wooldridge, E.; Beard, C. D.; Gerth, C.; Büchner, A.
Abstract: A DC photocathode gun is part of the injector of the Energy Recovery Linac Prototype (ERLP) presently being built at Daresbury Laboratory. A buncher is required for the ERLP downstream of the photocathode gun to decrease the relatively long bunches (20-30ps) from the GaAs cathode. Three different single-cell cavity designs were investigated: the Cornell buncher, the ELBE buncher and an EU cavity without Higher Order Mode (HOM) dampers. The properties of these cavities were studied with the computer codes CSTs Microwave Studio and ASTRA. The fundamental frequency and field pattern of each buncher was investigated in Microwave Studio. The EU cavity was scaled from 500MHz to the required frequency for the buncher of 1.3GHz. As the anticipated kinetic energy of the electron beam after the gun is about 350keV a particle tracking code including the space charge forces is mandatory to study the effect of the different buncher cavity designs on the beam dynamics. The particle tracking code ASTRA was used to study the performance of the bunchers for a variety of beam parameters. From these investigations it was found that the three bunchers produce very similar effects on the particle bunch.
Keywords: ELBE; RF; Buncher; Injector
  • Poster
    EPAC 2004, 05.-09.07.2004, Luzern, Schweiz
  • Contribution to proceedings
    EPAC 2004, 05.-09.07.2004, Luzern, Schweiz
    Proceedings of EPAC 2004: European Physical Society Accelerator Group, 92-9083-232-0, 467-469

Registration No. 9880 - Permalink


Universeller Gateway zum Datenaustausch zwischen dem Steuerungssystem der Strahlenquelle ELBE und den Datenaufnahmesystemen der Experimentatoren
Jainsch, R.
Abstract: Software zum Datenaustausch zwischen dem Steuerungssystem der Strahlenquelle ELBE und den Datenaufnahmesystemen der Experimentatoren
  • Lecture (others)
    Herbsttagung der Studiengruppe für Elektronische Instrumentierung im FZ Rossendorf, 27.-29.09.2004, Rossendorf, Deutschland

Registration No. 9833 - Permalink


Technical development at the Materials Research end-station
Oehme, W.; Dienel, S.; Strauch, U.; Eichhorn, F.; Schell, N.
Abstract: The report summarizes the most important technical developments realized in 2003/2004 at the Materials Research end-station. There are described new programs which simplify the visualisation and analysis of a large amount of data. These data are collected by a linear position sensitive detector (PSD) and a multi-channel analyzer. Additionally, an electronic stepperrmotor controller switch had been developed. It allows to use two different types of stepper motor controllers to control four of the axes of a 6-circle HUBER-diffractometrer by two different instrumentation systems.
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-418 März 2005, 47-49

Downloads:

Registration No. 9775 - Permalink


Improving the detection limit of the Radiochemistry end-station
Oehme, W.; Dienel, S.; Claußner, J.; Strauch, U.; Hennig, C.; Scheinost, A. C.
Abstract: A new multi-element detector with higher energy resolution was aqcuired which is instrumented with a high-rate digital multi-analysis spectrometer from X-ray Instrumentation Associates (XIA) which is particularly well suited for EXAFS with multi-element detectors. The installation of this new detector involved not only electronic instrumentation and software development, but - due to the complex radiochemical safety system at the Radochemistry end-station -also mechanical engineering.
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-418 März 2005, 44-46

Downloads:

Registration No. 9773 - Permalink


Technical developments at ROBL
Oehme, W.; Pröhl, D.; Dienel, S.; Claußner, J.; Strauch, U.; Funke, H.; Scheinost, A. C.
Abstract: The article describes the most important technical improvments which had been performed at the beamline ROBL in 2005 and 2006. These are new systems such a cryostat and a sample holder which unifies the adjustment of samples in the glove box. Additionally, there was an update of electronics and basic software to enhance the compatibility with the standard equipment used at ESRF beamlines (migration from OS9 to Linux operating systems, new instrumentation of beamposition monitors.) There was also a SMS-based warning system installed to inform the responsible beamline scientist in case of problems during unattended experiments.
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Dresden-Rossendorf; FZD-463 März 2007, 43-46

Registration No. 9768 - Permalink


Hard- und Software des Radiochemiemessplatzes ROBL an der ESRF/Grenoble
Oehme, W.; Scheinost, A. C.; Hennig, C.; Funke, H.; Roßberg, A.; Reich, T.; Claußner, J.; Dienel, S.
Abstract: Der Messplatz des Instituts für Radiochemie am Synchrotron der ESRF in Grenoble/Frankreich wird aus der Sicht der elektronischen Instrumentierung beschrieben. Der Schwerpunkt liegt auf dem benutzten Messprinzip und der gewählten Hard- und insbesondere Softwarestruktur. Insbesonder wird auf das benutzte Messprogramm "xatros", das eine messplatzspezifische ROBL-Eigenentwicklung ist, eingegangen.
  • Contribution to external collection
    Dr.F.Wulf: Bericht Frühjahrstagung Studiengruppe Elektronische Instrumentierung 27.-29-März 2006, Berlin: Hahn-Meitner-Institut Berlin, 2006, 0936-0891, 197-212

Registration No. 9764 - Permalink


CW Operation of the TTF-III Input Coupler
Knobloch, J.; Martin, M.; Anders, W.; Bauer, S.; Pekeler, M.; Belomestnykh, S.; Kostin, D.; Möller, W.; Büchner, A.; Büttig, H.; Gabriel, F.
Abstract: Several newly proposed superconducting linacs are designed to use TESLA technology operating CW rather than pulsed for which the system was developed. It must therefore be demonstrated that CW operation is feasible. Here we describe a series of CW tests with the TTF-III power coupler to determine the average power limit. These tests were performed on a coupler test stand both at room temperature at the FZ Rossendorf and under cryogenic operating conditions in BESSY’s HOBICAT[1] facility. An extrapolation of the measurements suggests that the coupler can handle 5 kW CW standing wave. It was also demonstrated that even higher power levels are feasible if the cooling of the inner conductor is modified.
  • Contribution to proceedings
    PAC Particle Accelerator Conference 2005, 16.-20.05.2005, Knoxville, TN, USA
    Proceedings of 2005 Particle Accelerator Conference, 3292-3294

Registration No. 9760 - Permalink


Development of a neutron time-of-flight source at the ELBE accelerator
Klug, J.; Altstadt, E.; Beckert, C.; Beyer, R.; Freiesleben, H.; Galindo, V.; Grosse, E.; Junghans, A. R.; Legrady, D.; Naumann, B.; Noack, K.; Rusev, G.; Schilling, K. D.; Schlenk, R.; Schneider, S.; Wagner, A.; Weiß, F.-P.
Abstract: The radiation source ELBE at Forschungszentrum Dresden-Rossendorf (FZD) has a superconducting linear accelerator with electron energies up to 40 MeV as a central instrument, and it will be used to produce intense neutron beams. The neutron radiator consists of a liquid lead circuit where bremsstrahlung photons generated from the electron beam produce neutrons in (gamma,n) reactions. Monte Carlo simulations with MCNP4C3/MCNP5 were performed to characterise neutron and photon intensities as well as time and energy distributions, and to optimise the neutron transport.

The short beam pulses (5 ps at FWHM) provide the basis for an excellent time resolution for neutron time-of-flight experiments, allowing an energy resolution of about 1 % with a flight path of 4 m when using a fast detector stop signal (e. g., 1 ns for 5 MeV neutrons). The neutron beam is shaped by a 2.4 m long collimator made from borated polyethylene and lead, reducing the background of scattered neutrons and of photons at the sample position. About 96 % of the neutrons at the experiment site retain their correct energy to time-of-flight correlation. The neutron flux at the sample position is calculated to be 10^7 cm^−2 s^−1. As ELBE will be able to deliver a full intensity beam with a repetition rate of 0.5 MHz, the usable neutron energy range goes from 50 keV up to 10 MeV. In this energy interval, there is a need for neutron cross section measurements relevant for the transmutation of minor actinides in nuclear waste, as well as for applications to fission and fusion reactors.

A BaF2 scintillation detector array of 42 crystals is being constructed for neutron-capture gamma-rays. The setup covers up to 96 % of the total solid angle. Simulations of gamma-ray cascades from 56Fe(n,gamma)57Fe reactions have been combined with detector simulations to characterise the response of the detector setup.
Keywords: superconducting electron accelerator; liquid-lead radiator; neutron beam; neutron time-of-flight; nToF; neutron scattering; neutron detector

Registration No. 9541 - Permalink


Microphonics Measurements at ELBE
Buechner, A.; Gabriel, F.; Schurig, R.; Staats, G.
  • Lecture (Conference)
    2nd Annual EUROFEL Workshop 2006, 06.-08.11.2006, Daresbury, UK
  • Poster
    2nd Annual EUROFEL Workshop 2006, 06.-08.11.2006, Daresbury, UK

Registration No. 9394 - Permalink


Development of a prototype superconducting cw cavity and cryomodule for energy recovery
Mcintosh, P. A. Beard; Dykes, C. D.; Todd, D. M.; Belomestnykh, B.; Liepe, S.; Medjidzade, M.; Padamsee, V.; Sears, H.; Shemelin, J.; Proch, V. D.; Buechner, A.; Michel, P.; Teichert, J.; Kimura, T.; Smith, T. I.; Byrd, J.; Corlett, J. N.; Li, D.
Abstract: Energy Recovery LINAC (ERL) and LINAC-driven FEL proposals and developments are now widespread around the world. Superconducting RF (SRF) cavity advances made over the last 10 years for TESLA/TTF at 1.3 GHz, in reliably achieving accelerating gradients >20 MV/m, suggest their suitability for these ERL and FEL accelerators. Typically however, photon fluxes are maximised from the associated insertion devices when the electron bunch repetition rate is as high as possible, making CW-mode operation at high average current a fundamental requirement for these light sources. Challenges arise in controlling the substantial HOM power and in minimizing the power dissipated at cryogenic temperatures during acceleration and energy recovery, requiring novel techniques to be employed. This paper details a collaborative development for an advanced high-Q0 cavity and cryomodule system, based on a modified TESLA cavity, housed in a Stanford/Rossendorf cryomodule. The cavity incorporates a Cornell developed resistive-wall HOM damping scheme, capable of providing the improved level of HOM damping and reduced thermal load required.
  • Contribution to proceedings
    European Particle Accelerator Conference EPAC 2006, 26.-30.06.2006, Edinburgh, GB
    EPAC 2006 - Proceedings, 436

Registration No. 9240 - Permalink


Monitoring von PV-Anlagen mittels terrestrischer Strahlungsdaten
Bodach, M.; Gasch, S.; Rindelhardt, U.; Hiller, W.; König, S.; Mehlich, H.
Abstract: Die Performance Ratio ist die am häufigsten verwendete Größe zur Charakterisierung der Qualität von Photovoltaik-Anlagen. Diese Größe widerspiegelt dabei die Wirkungs-grade der einzelnen Komponenten als auch die Qualität des Gesamtdesigns (Anpassung WR/Generator, Verschattung, Hinterlüftung etc.) der Anlage.
Dieser Wert lässt sich einfach aus dem Quotient der abgegebenen Energie (hier eingespeiste Energie) und der zugeführten Energie (hier Einstrahlung in Modulebene) über dem gleichen Zeitintervall darstellen. Die meisten Anlagenbetreiber kennen zwar die eingespeiste Energie aus dem Daten-ogging ihrer Wechselrichter, aber insbesondere bei kleineren PV-Anlagen stehen keine Strahlungssensoren zur Verfügung.
Im Beitrag soll eine einfache Möglichkeit vorgestellt werden, wie diese Anlagenbetreiber trotzdem zu einer verlässlichen Aussage über die Performance Ratio ihrer Anlage kommen, indem die Daten aus anderen, vorhandenen Globalstrahlungsmessungen in der näheren Umgebung genutzt werden. Diese stehen - oft unentgeltlich - im Internet (z.B. Agrar- Meteorolo-gisches Messnetz in Sachsen) zur Verfügung und erlauben eine brauchbare Abschätzung des Performance Ratio. Die Untersuchungen dazu werden exemplarisch für Sachsen präsentiert.
Die Untersuchungen ergaben, dass die gemessenen Globalstrahlungswerte in Sachsen nur relativ gering voneinander abweichen. Weiterhin wurde untersucht, welcher Einfluss zu erwarten ist, wenn der Abstand zwischen der Einstrahlungsmessstelle und der zu bewertenden PV-Anlage weiter voneinander entfernt ist als 50 km.
In Erweiterung bisheriger Ergebnisse werden hier Auswertungen über ein bzw. zwei Kalenderjahre vorgestellt.
Keywords: PV plant performance, performance ratio,
  • Contribution to proceedings
    22. Symposium Photovoltaische Solarenergie, 07.-09.03.2007, Staffelstein, Germany
    Tagungsband, Beitrag 75, 978-3-934681-53-8
  • Poster
    22. Symposium Photovoltaische Solarenergie, 07.-09.03.2007, Staffelstein, Germany

Registration No. 9213 - Permalink


The partial waveguide resonator of the U100-FEL at FZ Rossendorf
Freitag, M.; Schlenck, R.; Seidel, W.; Willkommen, U.; Wünsch, R.; Wustmann, B.
Abstract: The partial waveguide resonator of the U100-FEL at FZ-Rossendorf and its peculiarities are ilustrated.
Keywords: free-electron laser, waveguide, resonator, beam diagnostics
  • Contribution to proceedings
    28th International Free Electron Laser Conference, 27.08.-01.09.2006, Berlin, Germany
    The partial-waveguide resonator of the U100-FEL at FZ Rossendorf
  • Poster
    28th Int. Free Electron Laser Conference, 27.08.-01.09.2006, Berlin, Germany

Registration No. 8912 - Permalink


Development of a neutron time-of-flight source at the ELBE accelerator
Klug, J.; Altstadt, E.; Beckert, C.; Beyer, R.; Freiesleben, H.; Galindo, V.; Greschner, M.; Grosse, E.; Junghans, A. R.; Légrády, D.; Naumann, B.; Noack, K.; Schilling, K. D.; Schlenk, R.; Schneider, S.; Seidel, K.; Wagner, A.; Weiss, F.-P.
Abstract: The ELBE electron beam at Forschungszentrum Rossendorf, Dresden, with energies up to 40 MeV, will be used to produce intense neutron beams. The neutron radiator consists of a liquid lead circuit where bremsstrahlung photons created by the electrons produce neutrons in (gamma,n) reactions. The short beam pulses (5 ps) provide the basis for an excellent time resolution for neutron time-of-flight experiments, giving an energy resolution of about 1 % with a flight path of 4 m. The neutron beam is shaped by a 2.4 m long collimator. The usable energy range is from 50 keV up to 10 MeV when ELBE delivers a beam repetition rate of 0.5 MHz. In this energy interval, there is a need for neutron cross section measurements relevant for the transmutation of minor actinides in nuclear waste, as well as for applications to fission and fusion reactors. The neutron flux at the sample position is 10^7 cm^-2 s^-1. Different detector types are being developed. For neutron capture gamma rays, a BaF2 scintillation detector array of 42 crystals is being constructed, whereas for neutron detection, an up to 1 m^2 large plastic scintillator wall consisting of 1 cm thick scintillation panels is being built.
  • Contribution to proceedings
    International Workshop on Fast Neutron Detectors and Applications, 03.-06.04.2006, Cape Town, South Africa
    Proceedings of Science, (FNDA2006) 015, Italy
  • Lecture (Conference)
    International Workshop on Fast Neutron Detectors and Applications, 03.-06.04.2006, Cape Town, South Africa

Registration No. 8911 - Permalink


The Rossendorf IR-FEL ELBE
Michel, P.; Buettig, H.; Gabriel, F. G.; Helm, M.; Lehnert, U.; Schneider, Ch.; Schurig, R.; Seidel, W.; Stehr, D.; Teichert, J.; Winnerl, S.; Wünsch, R.
Abstract: The radiation source ELBE is the central research facility in the Forschungszentrum Rossendorf. The machine is based on a 40 MeV superconducting RF Linac wich can be operated up to 1mA in cwmode. After commissioning the Bremsstrahlung and the X-ray facilities in 2002, and 2003 respectively, and the first lasing of the mid- IR FEL (4-22 um) in 2004 about 7000 hours user beam-time have been provided. At present a second FEL for long IR waves (15-150 um) using a partial waveguide is under commissioning. Besides in-house users especially the IR beam is available to external users in the FELBE (FEL@ELBE) program witch is a part of the integrated activity on synchrotron and free electron laser science in the EU. In this talk the fundamental features of the ELBE IR FEL’s and the parameters demanded by users are displayed. In addition, an overview about user experimental work and important machine date like availability are shown. Future projects like the combination of the new High Magnetic Field lab with the ELBE-IR beams will be described.
  • Invited lecture (Conferences)
    28th Free Electron Laser Conference 2006, 27.08.-01.09.2006, Berlin, Germany
  • Contribution to proceedings
    28th Free Electron Laser Conference 2006, 27.08.-01.09.2006, Berlin, Germany
    Proceedings of the 28th International Free Electron Laser Conference, 488-491

Registration No. 8838 - Permalink


Pulsed RF System for the ELBE Superconducting Accelerator
Buechner, A.; Gabriel, F. G.; Buettig, H.; Lehnert, U.; Michel, P.; Schneider, Ch.; Schurig, R.
Abstract: The RF system for the ELBE accelerator was originally designed for CW mode. Although this works problem-free tests have shown that it is possible to reach higher gradients in the TESLA cavities with a pulsed RF system. The new RF system will be presented together with measurements of the achievable gradients. Roughly 30% higher gradients could now be used in pulsed mode. As positive side effects the radiation by field emission is reduced by the duty cycle and an easy in situ RF conditioning of cavities and coupler windows is possible.
  • Poster
    European Particle Accelerator Conference, 26.-30.09.2006, Edinburgh, Scotland

Registration No. 8833 - Permalink


A Pulsed-RF High-power Processing Effect of Superconducting Niobium Cavities observed at the ELBE Linear Accelerator
Lehnert, U.; Buettig, H.; Michel, P.; Schneider, Ch.; Schurig, R.; Buechner, A.; Gabriel, F. G.
Abstract: The driver LINAC of the ELBE radiation source is built for cw operation. However, in some cases a pulsed-mode operation was desired to extend the otherwise stringent gradient limits. The main restriction results from field emission that decreases the Q of the cavities which was evaluated from measurements of the liquid helium consumption. After pulsed-mode operation with gradients exceeding the maximum cw accelerating gradients by 30–40\% a significant reduction in the field emission was observed. This in turn allows higher accelerating gradients to be used in cw as well. We attribute this behaviour to an rf-processing of the cavity surface which burns off field emitters.
  • Contribution to proceedings
    European Particle Accelerator Conference EPAC 2006, 26.-30.06.2006, Edinburgh, Scotland
    EPAC 2006 - Proceedings, 413-414

Registration No. 8832 - Permalink


Die Zweiquellenanlage des Forschungszentrum Rossendorf - Neue Möglichkeiten für Experimente mit hochgeladenen Ionen
Kost, D.; Facsko, S.; Heller, R.; Schlenk, R.; Wustmann, B.; Zschornack, G.
Abstract: Die Rossendorfer Zweiquellenionenstrahlanlage stellt eine weltweit einmalige Kombination aus einer Elektron-Zyklotron-Resonanz-Ionenquelle mit einer bei Raumtemperatur arbeitenden Elektronenstrahl-Ionenquelle, der Dresden EBIT, dar. Die Ionenstrahlen beider Quellen münden in eine gemeinsame Targetkammer und stehen dort für Experimente zur Verfügung. Die erreichbaren Ladungszustände, die Ionenströme sowie die Energien der Ionen aus beiden Quellen unterscheiden sich aufgrund der verschiedenen Wirkungsprinzipien und gewährleisten so ein breites Spektrum an Experimenten. Die Gesamtanlage kann gegenüber der Targetkammer auf ein negatives Potential gebracht werden, wodurch sich die Ionen beider Quellen bis auf Energien unter q*100V abbremsen lassen. Die Untersuchung der Wechselwirkung langsamer hochgeladener Ionen mit Festkörperoberflächen, insbesondere der Einfluss der Potentialenergie der Ionen, ist neben der Ionenquellendiagnostik Gegenstand aktueller Forschungen an der Rossendorfer Zweiquellenanlage.
  • Lecture (Conference)
    Energiereiche Atomare Stöße, 06.-10.02.2006, Riezlern, Östereich

Registration No. 8397 - Permalink


A Far-Infrared FEL for the Radiation Source ELBE
Grosse, E.; Lehnert, U.; Michel, P.; Schlenk, R.; Seidel, W.; Wolf, A.; Willkommen, U.; Wohlfarth, D.; Wünsch, R.
Abstract: After successfully commissioning the mid‐infrared FEL (U27) and adjoining a second accelerator unit (up to 35 MeV) at ELBE we have modified our plan how to produce radiation in the far infrared.To ensure the continuous variation of the wavelength up to 150 microns we want to complement the U27 undulator by a permanent magnet undulator with a period of 100 mm (U100). The minimum gap of 24 mm and the hybrid construction consisting of Sm/Co magnets and soft iron poles ensures sufficient radiation resistance and allows rms undulator parameters up to 2.7. The large field variation allows us to cover the whole wavelength range by only two different electron energies (e.g. 20 and 35 MeV). To reduce the transverse beam size we use a partial waveguide which is 10 mm high and wide enough to allow free propagation inhorizontal direction. It spans from the last quadrupole in front of the undulator up to the downstream mirror and is somewhat longer than 8 m. To minimize the coupling losses between free propagation and the waveguide mode appropriate bifocal resonator mirrors will be sed. Detailed calculations and computer simulations predict an outcoupled laser power of roughly 35 W around 40 microns and 20 W at150 microns.
Keywords: undulator, free-electron laser, waveguide, radiation source ELBE
  • Poster
    27th Int. Free Electron Laser Conference, 21.-26.08.2005, Palo Alto, USA
  • Contribution to proceedings
    27th Free Electron Laser Conference, 21.-26.08.2005, Palo Alto, USA
    Proceedings of the 27th International Free Electron Laser Conference, 290-292

Downloads:

Registration No. 7584 - Permalink


Status of superconducting module development suitable for cw operation: ELBE cryostats
Teichert, J.; Büttig, H.; Michel, P.; Lehnert, U.; Schneider, C.; Möller, K.; Büchner, A.; Gabriel, F.; Stephan, J.; Winter, A.
Abstract: For the ELBE electron linear accelerator a superconducting accerating module was developed and is now in routine operation. The cryostat contains two TESLA cavities (1.3 GHz) and is designed for cw operation with an accelerating gradient of 10 MV/m and a maximum average beam current of 1 mA. For the power RF two 10 kW klystrons are used. Special tuners, power couplers, low level rf control, cryogenic control systems and safety systems were developed. We will discuss engineering design, operation parameters and our experience with the module.
  • Nuclear Instruments and Methods in Physics Research A 557(2006), 239-242
    DOI-Link: http://dx.doi.org/PII: S0168-9002(5)02000-0
  • Invited lecture (Conferences)
    32nd Advanced ICFA Beam Dynamics Workshop on Energy Recovering Linacs ERL 2005, 19.-23.03.2005, Newport News, USA

Registration No. 7293 - Permalink


First Lasing at the ELBE mid-IR FEL
Michel, P.; Evtushenko, P.; Lehnert, U.; Dekorsy, T.; Gabriel, F.; Grosse, E.; Helm, M.; Krenz, M.; Seidel, W.; Wohlfarth, D.; Wolf, A.; Wünsch, R.
Abstract: First lasing of the mid infrared FEL at ELBE was achieved on May 7, 2004. The Radiation Source ELBE at the Forschungszentrum Rossendorf in Dresden is currently under transition from commissioning to regular user operation. Presently the electron linac produces an up to 18 MeV, 1 mA (cw) electron beam which is alotted to generate various kinds of secondary radiation. After the successful commissioning of the bremsstrahlung and channeling-X-ray facilities during 2003 stable lasing has now been observed in the IR range (15 to 22 μm). The oscillator FEL is equipped with two planar undulator units, both consisting of 34 hybrid permanent magnet periods of 27.3 mm (Krms = 0.3 - 0.8). The distance between the two parts is variable and the gaps can be adjusted and tapered independently. At 19.6 µm an optical power of 3W was out-coupled in a macro pulse of 0.6 ms duration using an electron beam energy of 16.1 MeV and an energy spread of less than 100 keV; the micropulse charge was 50 pC and its width slightly above 1ps. With the installation of a second acceleration module for additional 20 MeV smaller wavelengths will become available in the near future.
  • Lecture (Conference)
    26th International Free Electron Laser Conference FEL 2004, 29.08.-03.09.2004, Trieste, Italy
  • Contribution to proceedings
    26th International Free Electron Laser Conference and 11th FEL Users Workshop, 29.08.-03.09.2004, Trieste, Italy
    Proceedings of the 26th International Free Electron Laser Conference and 11th FEL Users Workshop, MOAIS04, Trieste: Graphart ts, 88-87992-02-9 (CD), 88-87992-02-9 (Book), 8-13

Downloads:

Registration No. 7288 - Permalink


Feasibility study of wrist watched based radiation survey meter
Wolf, A.
Abstract: Feasibility study of wrist watched based radiation survey meter
  • Invited lecture (Conferences)
    Research Coordination Meeting, 04.-08.10.2004, Sochi, Russische Förderation

Registration No. 7108 - Permalink


Mechanische und optische Anforderungen an die Cavity des FEL
Wolf, A.
Abstract: Mechanische und optische Anforderungen an die Cavity des FEL
  • Lecture (others)
    Studiengruppe für Elektronische Instrumentierung, 27.09.2004, Rossendorf, Deutschland

Registration No. 7107 - Permalink


CW test of the TTF-III input coupler at Rossendorf
Bauer, S.; Belomestnykh, S.; Buechner, A.; Büttig, H.; Gabriel, F.; Knobloch, J.; Moeller, W.-D.; Pekeler, M.
Abstract: While many laboratories plan to use TESLA-like cavities and/or cryomodules in CW regime, the TTF-III coupler [1] has never been tested in CW mode to find out what is its average power limit and what parts of the coupler would require upgrade/redesign for higher average power operation. ACCEL, BESSY, Cornell, DESY and Rossendorf agreed to collaborate on such a test of the TTF-III coupler. ACCEL manufactured one TTF-III coupler free of charge and assembled it on the test stand in clean-room condition. DESY provided the test stand, some additional hardware and its “know-how” in testing TTF-III couplers. Cornell provided IR viewports, instrumentation feedthroughs and its expertise and help during the coupler test and tried to coordinate joint efforts. BESSY participated in the test and offered a follow-up test in the new HoBiCaT horizontal test facility [2]. The test happened at Rossendorf at their 10 kWCW klystron test transmitter from June 14 to June 18.
  • Other report
    ERL - Report ERL 04-10, 2004

Registration No. 6938 - Permalink


Electron beam diagnostic and the undulator field adjustment of the ELBE IR-FEL
Evtushenko, P.; Gippner, P.; Grosse, E.; Michel, P.; Seidel, W.; Wohlfahrt, D.; Wolf, A.; Wolf, U.; Wünsch, R.; Wustmann, B.; van der Geer, C. A. J.
Abstract: For the electron beam diagnostic in the undulator of the ELBE FEL two systems are completed. The first one consists of insertable OTR (Optical Transition Radiation)view screens. The same view screens will be used for the FEL optical resonator alignment. This is why there are very strong requirements on the long-term positioning reproducibility of the view screens. The second system is based on a single moveable YAG (Yttrium Aluminum Garnet activated by Cerium) screen, which can travel within the undulator vacuum chamber such that the electron beam position can be measured at any place in the undulator. Both systems are completed and successfully tested. Results of the tests as well as design ideas are presented. After transporting two undulator units to Rossendorf and installing the stainless steel vacuum chamber the magnetic field has been measured again and adjusted applying the pulsed-wire method. Irregularities of the undulator magnetic field could affect gain and wavelength of the FEL. Such effects were analyzed using numerical simulations.
  • Poster
    25th International Free Electron Laser Conference, and the 10th FEL Users Workshop 2003, 08.-12.09.2003, Tsukuba, Ibaraki, Japan
  • Contribution to proceedings
    25th International Free Electron Laser Conference, and the 10th FEL Users Workshop, Part II, 08.-12.09.2003, Tsukuba, Ibaraki, Japan
    Extended Abstracts, book edition of the proceedings, 0-444-52727-8, II-29

Registration No. 5917 - Permalink


Status of the ELBE accelerator - a driver for different radiation sources
Michel, P.; Gabriel, F.; Grosse, E.
Abstract: At the Forschungszentrum Rossendorf (FZR) the new facility ELBE for research with various kinds of radiation (IR from FEL´s, quasi-monochomatic channeling X-rays, bremsstrahlung in the MeV range, neutrons) is presently under construction. ELBE is centered around a superconducting Electron Linac which will produce quasi-continuous beams of high Brilliance and low Emittance. Electron beams with variable bunch charges up to 80 pC and variable repetition rates up to 260 MHz are produced in a pulsed thermionic DC gun followed by a two-stage RF bunching system. Two cryomodules each containing two 9-cell RF-cavities (1.3 Gz) accelerate the electrons t 40 MeV. At present the 250 keV injector has been installed and tested. The accelerator is planned to deliver a 20 MeV beam at the end of 2000. First results of beam parameter measurements at the 250 keV injector will be shown. Detailed transverse emittance studies by multi-slit techniques and investigations concerning the longitudinal phase space will be discussed
  • Lecture (Conference)
    FEL-Conferenz 2000

Registration No. 5752 - Permalink


Comissioning of the ELBE Superconducting Electron Linac
Michel, P.; Büchner, A.; Evtushenko, P.; Gabriel, F.; Lehnert, U.; Teichert, J.; Voigtländer, J.
Abstract: The radiation source ELBE at Forschungszentrum Rossendorf is based on a superconducting linear accelerator that produces a cw electron beam up to 40 MeV and 1 mA. In 2001 first stage of the ELBE-linac was put into operation. The main electron beam parameters like energy, energy spread, transverse emittance and bunch length were specified and several online diagnostic tools for ELBE routine high-power operation were tested, such as λ/4-stripline monitors and beam-loss detectors.
  • Lecture (Conference)
    EPAC 2002, Paris, Frankreich, 03.06. - 07.06.2002
  • Contribution to proceedings
    EPAC 2002, 03.-07.06.2002, Paris, Frankreich
    Proceedings of EPAC 2002

Registration No. 5738 - Permalink


The optical resonator of the IR-FEL at ELBE
Seidel, W.; Evtushenko, P.; Gippner, P.; Grosse, E.; Jainsch, R.; Oepts, D.; Sobiella, M.; Wohlfarth, D.; Wolf, A.; Wolf, U.; Wünsch, R.; Wustmann, B.
Abstract: To allow first lasing at the ELBE FEL at the end of 2003 various efforts have been made. In particular, the optical resonator including the system which controls and stabilizes its length and alignment has been installed and tested. The resonator length is controlled by means of an interferometer beam passing diagonally from one side of the upstream mirror to a retroreflector on the opposite side of the downstream mirror.
To avoid temperature effects the mirror holders have been equiped with a special heating and cooling system which stabilizes the mirror temperature. Simulating maximum laser power the cavity detuning due to temperature changes has not exceeded 1micron.
The alignment of the resonator axis is controlled by the overlap of two He-Ne laser beams entering the resonator from each side. To predict the outcoupled laser power and the upper wavelength limit we have modeled the IR-beam propagation in the optical resonator. In particular, the vacuum chamber in the undulator, which is 10 mm high, and the outcoupling hole affect the beam power and profile significantly; respective results will be presented.
Keywords: Keine
  • Poster
    25th Int. Conf. on Free Electron Laser, Tsukuba, Ibaraki, Japan, 8 - 12 September 2003
  • Nuclear Instruments and Methods in Physics Research A 528(2004)1-2, 199-202

Registration No. 5695 - Permalink


A Resonant Beam Current Monitor for ELBE
Schurig, R.; Büttig, H.; Büchner, A.
Abstract: During the first stages of commissioning ELBE, the beam current could be measured directly at the gun, the macropulser aperture and at the beam dump. Later, a package consisting of a resonant beam current monitor (RBCM) and a resonant beam position monitor was added. The result of the RBCM test are described in this paper.
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-341 April 2002, 15-15

Registration No. 5673 - Permalink


The Radiation Source ELBE at the Research Center Rossendorf
Lehnert, U.; Büchner, A.; Büttig, H.; Enghardt, W.; Evtushenko, P.; Gabriel, F.; Gippner, P.; Grosse, E.; Guratzsch, H.; Michel, P.; Naumann, B.; Neubert, W.; Prade, H.; Schamlott, A.; Schilling, K. D.; Schwengner, R.; Seidel, W.; Teichert, J.; Voigtländer, J.; Wagner, A.; Wagner, W.; Wolf, A.; Wolf, U.; Wünsch, R.
Abstract: At the Forschungszentrum Rossendorf (FZR) the new facility ELBE for research with various kinds of radiation is presently under construction. ELBE is centered around a superconductiong Electron Linac which will produce quasi-continuous beams of high Brillance and low Emittance. Preliminary results of the first stage accelerator tests will be shown. The 40 MeV / 1 mA electron beam will be used to drive free-electron lasers for the production of infrared light in the 5-510µm wavelength range. X-ray beams in the 5-50 keV energy range will be generated using channeling radiation. Additionally, the ELBE facility will provide bremsstrahlung and photoneutron beams for investigations in nuclear physics and technology.
  • Contribution to external collection
    Electron-Photon Interaction in Dense Mediaed. H. Wiedemann NATO Science Series II Vol. (2002) 49 p. 313

Registration No. 5612 - Permalink


Design, Construction and Test of Stripline BPM Electronics
Schurig, R.; Evtushenko, P.; Gabriel, F.; Büttig, H.
Abstract: Commisioning and operating the ELBE accelerator requires exact knowledge and easy, reproduceable control of various parameters. Important parameters like beam position and beam current are measured with a system consisting of a stripline BPM (beam position monitor), conversion electronics, data acquisition and monitoring software. The design of the electronics is described in this paper
  • Contribution to HZDR-Annual report
    Wissenschaftlich-Technische Berichte / Forschungszentrum Rossendorf; FZR-341 April 2002, 14-14

Registration No. 5599 - Permalink


Stripline Beam Position Monitors for ELBE
Evtushenko, P.; Büchner, A.; Büttig, H.; Michel, P.; Schurig, R.; Wustmann, B.; Jordan, K.
Abstract: At the Forschungszentrum Rossendorf (FZR), the superconducting electron linear accelerator ELBE is under construction. It will deliver an electron beam with an energy of up to 40 MeV at an average beam current of up to 1mA. The accelerator uses standing wave DESY type RF cavities operating at 1.3 GHz. A non-destructive system for the measurement of the beam position at about 30 locations is needed. To obtain the required resolution of 100 mm, a system of stripline beam position monitors (BPM) is under design.
  • Poster
    5th European Workshop on Diagnostics and Beam Instrumentation Sunday 13th to Tuesday 15th May, 2001 ESRF, Grenoble, France

Registration No. 5593 - Permalink


First operation of the ELBE superconducting electron lineat accelerator
Büchner, A.; Evtushenko, P.; Gabriel, F.; Lehnert, U.; Michel, P.; Schneider, C.; Teichert, J.; Voigtländer, J.
Abstract: The ELBE project is intended to produce a wide spectrum of different radiation and neutrons, especially coherent light in the medium and far infrared by means of a free electron laser. The driver of the radiation source is a super-conducting electron linear accelerator designed for a wide range of beam parameters in order to satisfy the various requirements.
Recently, the forst cryostat containing two nine-cell niobium standing wave rf cavities for an acceleration up to 20 MeV has been put into operation and has been cooled down. For the first time, an accelerated electron beam has been produced successfully.
The helium cooling for the cryostat working at 1.8 K, the electron beam injector, the radio frequency system, beam control and beam diagnostics operate very reliably. In the paper the results of the beam parameter measurements and the experiences gained in the first operation period will be presented.
  • Poster
    23rd International Free Electron Laser Conference, 20.-24.08. 2001, Darmstadt, Deutschland
  • Open Access LogoContribution to proceedings
    23rd International Free Electron Laser Conference, 20.-24.08.2001, Darmstadt, Deutschland
    Proceedings of FEL 2001, II-19

Registration No. 5572 - Permalink


A transport and diagnostic system for the IR beam of ELBE
Dekorsy, Th.; Grosse, E.; Helm, M.; Seidel, W.; Wohlfarth, D.; Wolf, A.; Wünsch, R.
Abstract: We outline the diagnostic and transport system of the infrared beam produced by the two free-electron lasers of the ELBE facility.
  • Poster
    Proc. 24th Int. Conf. on Free Electron Lasers, Argonne (USA) 2002, Nucl. Instr. Meth. A 507 (2003) II-35
  • Contribution to external collection
    Proc. 24th Int. Conf. on Free Electron Lasers, Argonne (USA) 2002, Nucl. Instr. Meth. A 507 (2003) II-35

Registration No. 5416 - Permalink


Design study of a waveguide resonator for an infrared FEL at ELBE
Gallerano, G. P.; Gover, A.; Grosse, E.; Seidel, W.; Tecimer, M.; Wolf, A.; Wünsch, R.
Abstract: Es werden Entwurf und Rechnungen zu einem partiellen Wellenleiter f"ur den U50 Undulator des Rossendorfer ELBE Projektes vorgestellt.
  • Poster
    Proc. 22nd Int. Conf. on Free Electron Lasers, Durham USA 2000, (North-Holland, Amsterdam 2001) ed. V.N.Litvinenko, Y.K.Wu, pp. II-45,46
  • Contribution to external collection
    Proc. 22nd Int. Conf. on Free Electron Lasers, Durham USA 2000, (North-Holland, Amsterdam 2001) ed. V.N.Litvinenko, Y.K.Wu, pp. II-45,46

Registration No. 5415 - Permalink


Pages: [All] [1] [2]