Cryogenic Experience at the Hera Magnet Measurement Facility
The proton storage ring of HERA will contain 422 superconducting dipole magnets1 and 224 superconducting quadrupole magnets.2 At the newly constructed HERA magnet measurement facility, each of the superconducting magnets will be individually tested before being installed in the 6-km ring tunnel. This paper describes the design and initial operation of the helium cryogenic distribution system that allows independent testing of the HERA cold-iron magnet. Operation of each magnet at liquid helium temperature insures the quality of the magnetic characteristics and the cryogenic performance. Six test stands are completely instrumented to monitor the cryogenic conditions of the magnet under test. A process-control computer system is used to record the measurements and automate the cryogenic operation of the measurement facility. Helium for magnet testing is supplied by one of the 6.5-kW helium refrigerators for HERA. A large, helium subcooler is included in the measurement facility to produce the correct operating temperature at the test stands. The performance of the cryogenic system and the schedule for magnet testing are discussed.
KeywordsTest Stand Cryogenic System Measurement Facility Ring Tunnel Isolation Valve
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- 1.H. Kaiser, “Design of Superconducting Dipole for HERA,” DESY HERA 1986–14, Deutsches Elektronen-Synchrotron DESY, Hamburg (1986).Google Scholar
- 2.R. Anzolla, P. Le Marrec, A. Patoux, J. Perot and J. M. Rifflet, Superconducting Quadrupoles for HERA, in “Proceedings of the Workshop on Superconducting Magnets and Cryogenics,” Brookhaven National Laboratory BNL 52006 (1986), pp. 195–198.Google Scholar
- 3.P. Beurer, et al., Performance Test of the HERA 3 X 6500 W Helium Refrigeration Plant, paper CB-4 at this conference.Google Scholar
- 4.H. R. Baron, Jr., M. Clausen and G. Keßler, Cryogenic System for the HERA Magnet Measurement Facility, in: “Proc. Eleventh Int. Cryo. Engr. Conf.,” Butterworth, Guildford, UK (1986), pp. 173–177.Google Scholar