Improvement of vacuum characteristics of cryostats for HPGe gamma-radiation detectors
Using mass spectrometry methods, the composition of residual gases and its temporal dynamics in experimental cryostats for HPGe detectors of gamma radiation, have been investigated.
The studies were carried out for a vertical dipstick cryostat with vacuum chamber of small volume (1200 cm3) and an U-type cryostat having its vacuum chamber combined with vacuum cavity of a Dewar vessel (total volume 36500 cm3).
Results of residual gas analysis are presented, showing the effect of Combogetter on a composition of residual gases of warm cryostats. Its use as an auxiliary getter for cryostats with HPGe detectors, maintaining a vacuum during storage or transportation, is considered.