Abstract

Titanium sublimation pumps have been studied in reasonable detail over the past few decades. This type of pump evolved primarily to ensure fast pump down in industrial systems. Though it has been adopted for accelerator, fusion and space applications, it has always been used as an auxiliary pump. We have tried to evaluate the various commercially available sublimation pumps, including TiBall®, for use in storage rings. A number of interesting aspects like the influence of impurities in titanium, the vacuum chamber walls, operating parameters, the purity of gases and consequent substitution reactions while pumping H 2, N 2, CO, CO 2, CH 4 and mixtures of gases were studied. Besides possibility of trapping of gases like Ar and their evolution in the system are investigated. In essence, there is still a lot to be understood about the mechanism of sublimation pumping and we present here some new data and analysis.

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