Contact

Dr. Arnd Junghans
Project leader
Nuclear Physics
a.junghansAthzdr.de
Phone: +49 351 260 - 3589
Fax: +49 351 260 - 13589

Dr. Roland Beyer
Postdoc, beam line scientist
Nuclear Physics
roland.beyer@hzdr.de
Phone: +49 351 260 - 3281

Neutrons at ELBE

Fast neutron facilities are generally of two types: white neutron sources and quasi-monoenergetic neutron sources. While the latter deliver neutron beams at a single energy, the white sources produce neutrons in a continuous range of energies when a beam of charged particles hits a heavy target like tungsten or lead. In this case, the energy of a neutron can be determined by measuring its velocity by flight time.

At the ELBE - Center for High-Power Radiation Sources of HZDR the very compact neutron time-of-flight system nELBE has been built. The electron beam emitted by the superconducting electron linear accelerator ELBE is used to produce a white neutron spectrum in a liquid-lead neutron radiator. The neutron kinetic energy ranges from below 100 keV to above 10 MeV with a variable repetition rate from single pulse operation to 400 kHz (c.w.). The flight path range is about 5 – 11 m.

Floorplan nELBE
Floorplan of the nELBE time-of-flight facility with photoneutron source (bottom) and low-background experimental hall (top). The insets show details of the photoneutron production in a liquid lead circuit, the neutron beam collimator and an experimental setup with γ-ray detectors for inelastic scattering.

In the fast neutron energy range, there is a need for neutron-induced reaction data relevant for basic science and technical applications. The long-term needs for nuclear data are updated every ten years by international experts at the International Atomic Energy Agency [1].

Characteristic parameters:

HZDR Quadrat  repetition rate: 102, 203, 406 kHz
HZDR Quadrat  flight path: 5 - 11 m
HZDR Quadrat  source strength: ca. 1.6·1011 n/s
HZDR Quadrat  flux at target: ca. 2.5·104 n/cm2/s
HZDR Quadrat  energy range: 10 keV - 15 MeV
HZDR Quadrat  energy resolution: < 1%
Characteristic parameters of the nELBE facility for time-of-flight experiments. Source strength and flux at target are the values for 200 kHz repetition rate and the maximum electron bunch charge of 77 pC.

In addition, the TU Dresden DT neutron generator (contact: Prof. Dr. Kai Zuber, TU Dresden) that produces monoenergetic neutrons at 14 MeV is located in the ELBE accelerator hall. This facility is used for fusion neutronics studies and neutron activation experiments related to fundamental physics, e.g. the search for the neutrinoless double-beta decay.

[1] Long Term Needs for Nuclear Data Development (INDC(NDS)-0601, ed. A. Plompen 2011, Vienna: International Atomic Energy Agency Nuclear Data section)


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Transnational Access

Transnational access to the nELBE facility is possible through the FP7-Project CHANDA


Research Grants

  • CHANDA ”Solving Challenges in Nuclear Data for the Safety of European Nuclear Facilities ”
    01.12.2013 - 30.12.2017, EURATOM FP7-605203 

former:


Recent publications

Backward-forward reaction asymmetry of neutron elastic scattering on deuterium
E. Pirovano; R. Beyer; A. R. Junghans; N. Nankov; R. Nolte; M. Nyman; A. J. M. Plompen

Improving material properties and performance of nuclear targets for transmutation-relevant experiments
A. Vascon; N. Wiehl; J. Runke; J. Drebert; T. Reich; N. Trautmann; B. Cremer; T. Kögler; R. Beyer; A. R. Junghans; K. Eberhardt; C. E. Düllmann

Neutron-induced fission measurements at the time-of-flight facility nELBE
T. Kögler; R. Beyer; A. R. Junghans; R. Massarczyk; R. Schwengner; A. Wagner
  • Open Access LogoContribution to proceedings
    Scientific Workshop on Nuclear Fission Dynamics and the Emission of Prompt Neutrons and Gamma-Rays, THEORY-3, 16.-18.09.2014, Opatija, Kroatien
    Physics Procedia, Amsterdam: Elsevier, 150-155
    DOI-Link: http://dx.doi.org/10.1016/j.phpro.2015.04.020


All nELBE publications


Contact

Dr. Arnd Junghans
Project leader
Nuclear Physics
a.junghansAthzdr.de
Phone: +49 351 260 - 3589
Fax: +49 351 260 - 13589

Dr. Roland Beyer
Postdoc, beam line scientist
Nuclear Physics
roland.beyer@hzdr.de
Phone: +49 351 260 - 3281