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.
KeywordsHelium Liquefaction Refrigeration
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