Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Technical concepts for the operation of a Cameca 7f-Auto as ion source for the HZDR Super-SIMS
Ziegenrücker, R.; Merchel, S.; Renno, A. D.; Rugel, G.; Akhmadaliev, S.; Wustmann, B.
Super-SIMS - also called Accelerator-SIMS - is an ultrasensitive analytical method (Döbeli et al., 2013; Renno et al., 2013). A Super-SIMS-Set-up is now under installation at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) by connecting a conventional SIMS-source (Cameca 7f-Auto) to a 6 MV tandem accelerator (Akhmadaliev et al., 2013). The operation of a classical SIMS demands strong structural and building technological efforts [Cameca, 2012]. The requirements for the 6 MV tandem accelerator at the HZDR are of the same complexity.
Requirements # Cameca 7f-Auto # 6 MV tandem accelerator
vibrations # very strict # -
temperature | fluctuation # 19°C < T < 23°C|< 1°C•h-1 # max. 25°C
relative humidity | fluctuation # 30% < RH < 75% | < 10%•h-1 # 30%< RH < 75%
spurious magnetic field # < 3•10-7 Tesla # < 10-4 Tesla
vacuum # 10-9 mbar # 10-6 mbar
cooling | fluctuation # 17°C – 19°C | < 1°C•h-1 # 20°C – 25°C
nitrogen # N4.8 # N4.8
compressed air # dry | 5 – 7 bar | 35 – 50 L•min-1 # dry | 5 – 7 bar
uninterruptible power supply # 10 min # only for PC
radiation safety # - # very strict
The original specifications to optimally run both machines are in many cases incompatible. An additional challenge originates from the fact that a pre-acceleration voltage of 30 kV to inject negative secondary ions into the accelerator is needed. To guarantee the compliance with all specifications and safety regulations a specific concept for the housing of the Cameca 7f-Auto following a house-in-house-principle was developed. This concept guarantees the following operational options:
- independent operation of the 6 MV tandem accelerator
- independent operation of the Cameca 7f-Auto
- combined operation as a Super-SIMS by remote control
- operation of the Super-SIMS by remote control from outside the HZDR in the framework of the planned Helmholtz-SIMS network SIGMA
Döbeli et al., 2013, this meeting.
Renno et al., 2013, this meeting.
Akhmadaliev S., Heller R., Hanf D., Rugel G., Merchel S. (2013) The new 6 MV AMS-facility DREAMS at Dresden. Nucl. Instr. Meth. Phys. Res. B, 294, 5-10.
CAMECA (2012) IMS 7F Auto Installation & Delivery Conditions
Keywords: 6 MV Tandemaccelerator; SIMS; CAMECA 7f-Auto; Super-SIMS; Housing; Gabro; SIGMA
Seventh Biennial Geo-SIMS Workshop, 20.-22.08.2013, Potsdam, Deutschland