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Summary
The commission of cryogenics and gas handling for PandaX-4T experiment has been carried out to study and demonstrate the ability of cryogenics at high purification speed. The total cooling power of the Cooling Bus with three cooperating coldheads is ~ 580 W at 178 K. The Cooling Bus with at least two coldheads running can handle ~ 6 tons of liquid xenon even when two loops are running.
The filling rate with the LN2 cooling coil reaches ~ 700 kg/day in the process of continuous liquification of about 6 tons of xenon. For LN2 recovery system, the recuperation rate is ~ 440 kg/day. It will be improved by using a high-pressure compressor in the future.
With the use of a high-capacity pump and low flow resistance pipes for purification system, the flow rate of LOOP1 reaches ~ 100 slpm and the getter of LOOP2 is the main restriction for the gas flow. The bigger parallel plate HE in the new designed loops provides $\sim 97.5\pm0.5\%$ efficiency of heat exchange. The sum of purification speed is up to ~ 155 slpm for LOOP1 and LOOP2. The LOOP2 could be improved in the future by replacing the Simpure getter with a low flow resistance purifier.
