I’m trying to collect some information about the refilling process of a helium cryogenic plant. Due to the physiologic losses I expect to have to foreseen a periodic refilling of helium. Our plant will be characterized by a refrigerator/liquefactor. A control cryostat with 4.5 K LHe coming from the liquefactor will be used to recirculate the cold helium. The warm gaseous helium will be stored in medium pressure tanks.
I would like to know:
– Whether the refilling of helium inside the plant has to be in gaseous phase inside the medium storage tanks or in liquid phase inside the cryostat
– How this refilling process is performed at CERN
– Any other information about the common procedure
