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Cryostat for the cryogenic current comparator.

Number: 0031

Author(s) : TROMMLER G., SCHOEPE F., SCHROEDER G., KADE A., HAIDER D., SIEBER T.

Summary

  For the non-destructive measurement of electric particle beam currents below the detection threshold of standard beam diagnostics in the beamlines and storage rings of FAIR, the so-called Cryogenic Current Comparator (CCC) will be used. In a joint effort between ILK Dresden and GSI Darmstadt a beamline cryostat for the CCC has been developed.  The CCC monitor uses a highly sensitive SQUID magnetometer to detect the magnetic field of the ion beam in order to obtain DC beam currents. SQUIDs demand a very stable operating environment to achieve good measurements. Therefore, the custom cryostat uses an exhaust-cooled copper shield to avoid vibrations that would come from an additional cold-head for shield cooling. Moreover, it was designed for minimum heat load to avoid temperature and pressure fluctuations due to boil-off effects. The temperature distribution is monitored on all major components of the cryostat. The operating time is prolonged by a helium liquefier with a capacity of 15 l/day. This value corresponds to the measured evaporation rate without liquefier. The final goal is to run cryostat and liquefier as a closed standalone system. Concerning the mechanical design, the new cryostat was built for efficient access to the detector and for the use of detectors of different sizes. It is installed at the UHV-beamline of the low-energy storage ring CRYRING at GSI for test operation and for support of the experimental program.  This publication shows several steps of the development of the LHe cryostat, the thermal shield, the vacuum chamber and the interaction of the cryostat with the external re-liquefaction in a closed circuit. Finally, details about the cryogenic setup at CRYRING and first measurement results of the CCC monitor are presented.

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Pages: 7

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Details

  • Original title: Cryostat for the cryogenic current comparator.
  • Record ID : 30029022
  • Languages: English
  • Source: Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
  • Publication date: 2021/10/05
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2021.0031
  • Document available for consultation in the library of the IIR headquarters only.

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