Abstract
The PIP-II cryogenic system consists of a Superfluid Helium Cryogenic Plant (SHCP) and a Cryogenic Distribution System (CDS) connecting the SHCP to the Superconducting (SC) Linac consisting of 25 cryomodules. The dynamic heat load of the SC cavities for continuous wave (CW) as well as pulsed mode of operation are determined. The static heat loads of the cavities along with the CDS are discussed. The supercritical helium (SHe) flow requirements for each cryomodule are computed through simulation study. Comparison between the flow requirements of the cryomodules for the CW and pulsed modes of operation are made. From the total computed heat load and pressure drop values in the CDS, the basic specifications for the SHCP, required for cooling the SC Linac, have evolved.
Highlights
supercritical helium (SHe) line divided into two streams inside each cryomodule, one directed to a sub-atmospheric heat exchanger (SP HX) and subsequently to a JT valve, while the other to the Low Temperature Thermal Intercepts (LTTI)
Superfluid Helium Cryogenic Plant (SHCP) will supply high-pressure helium gas at 35-40 K to the Cryogenic Distribution System (CDS) for the High Temperature Thermal Shield (HTTS). This shield flow is returned from the CDS to the CB at around 80K
Wide ranging heat load mitigation requirements pertaining to different modes of operation Holistic simulation study including the entire system Determination of mass flow rate in all the cold helium lines B, C, D, E and F in the CDS as well as 2 K gaseous helium (GHe) helium flow in cryomodules Estimation of helium supply requirements from SHCP
Summary
Maintain stable pressure (+/- 100 Pa) in the cryomodules to minimize microphonics Provide full segmentation of the SRF Linac and installation/removal of a cryomodule under cold conditions 2 K pulsed mode: reduced dynamic heat load
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