Commissioning of the Helium Cryogenic System and LN2 Transfer System in the TPS Ring

Abstract Because civil construction was delayed, a separate test area for a refrigerator and liquefier (R/L area) was constructed for the assembly and testing of a TPS helium cryogenic system in year 2012. In 2012 March the TPS helium cryogenic system was installed and tested in the test area with a transfer line for liquid nitrogen (LN 2 ) without a vacuum jacket in October 2012. Completion of the civil construction of the TPS ring enabled installation of the system in mid-2013. The cryogenic system in the R/L area was then disassembled and relocated from the R/L test area to the TPS ring. The vacuum-jacketed LN 2 transfer line with a phase separator was installed in November 2013. We present here the results of disassembly, reinstallation and recommissioning of the cryogenic system. The testing of the functioning and the heat load of the transfer line and phase separator for LN 2 is also discussed.