NONEVAPORABLE GETTER APPLICATIONS IN CRYOGENIC SYSTEMS

The application of non-evaporable Zr-V-Fe getters to enhance and maint ain the vacuum of cryogenic systems have been studied. It has been sho wn that the pressur erise rate of the insulation space of these system s are significantly reduced by the getter activation. The gettering ac tion is substantial even at abient temperature for many gases includin g hydrogen which can not be cryosorbed at LN2 temperatures. The getter can be activated several times and they can act as in-situ pumps for cryogenic systems, especially for field units.