The ASST magnet string cryogenic refrigeration requirements were planned around an original design and a much smaller, backup, He refrigeration system. The ASST schedule required that the backup, or Plan B, helium refrigerator provide and meet all the requirements of the milestone test. The Plan B design, layout, sub-system commissioning tests, and the performance schedule will be provided. The magnet string cryogenic system pump and purge, cooldown and warmup, central and multiple shield cooling, temperature control and subcooling, and recooler operating experience are reported.
KeywordsCold Compressor Quench Response Magnet String Helium Refrigerator Supercritical Helium
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