Study of fluid flow parameters of cryogen distribution system for E-Linac facility of RIB Project at VECC, Kolkata

The cryogenic infrastructure for the e-Linac will have LHe liquefier, LHe distribution lines and liquid nitrogen (LN₂) distribution lines. LN₂ distribution lines supply liquid nitrogen to the LHe liquefier, 80K thermal shields of the cryomodules and LHe distribution system. The total heat load to the nitrogen system has been estimated. Study was carried out for both series and parallel flow connections for LN₂ circulation. Various flow parameters e.g. mass flow rate, fluid quality, pressure and temperature at different locations of the helium distribution systems were calculated by considering two phase fluid flow. These flow parameters are very crucial to ensure the optimum operation of cryogenic distribution system. Provision of using the return cold helium vapour (40K/80K) as a coolant of thermal shield of the cryomodules were studied to rule out the LN₂ flow requirement to the cryomodules.