Development of superfluid helium vacuum unit based on decompression and cooling
2 K superfluid helium is obtained by vacuum pumping the helium to saturated va-por pressure at the entrance of the helium pool in Southern Advanced Photon Source Test Platform(SAPS-TP)in order to provide a cryogenic environment for the superconducting cavity.A set of decompression and cooling vacuum unit is developed for vacuum pumping.The design and selec-tion calculation are discussed in detail.The operation experience of various large-scale 2 K cryo-genic systems is used for reference and optimization.The performance test of the superconducting cavity has been completed for more than 20 times,and the vacuum unit exhibits a stable perform-ance and accurate control of the helium pool pressure,temperature and liquid level.Test results show that the performance of the developed vacuum unit meets the design requirements.
cryogenic system2 K superfluid heliumdeveloped and designpump unit
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