Nonevaporable getter investigation at the National Synchrotron Light Source
Journal Article
·
· Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)
- Brookhaven National Laboratory, Upton, New York 11973 (US)
We report H{sub 2}, CO, and CO{sub 2} pumping speed measurements on a linear pump using NEG strip St 707 (Saes Getters Inc.) as a function of both adsorbed gases and number of activations. To simulate the conditions of an operating storage ring a gas mixture of 50% H{sub 2}, 35% CO, and 15% CO{sub 2} is used in all measurements. Initial measured pumping speeds of {gt}450 l m{sup {minus}1} s{sup {minus}1} decrease to 200 and 100 l m{sup {minus}1} s{sup {minus}1} for H{sub 2} and CO, respectively, after 70 air exposures. A further drop to 50 l m{sup {minus}1} s{sup {minus}1} for CO occurs at CO loading of 1{times}10{sup {minus}2} Torr l m{sup {minus}1}. CO{sub 2} and CO pumping speeds are about the same. The photon stimulated desorption for both baked and activated strips is an order of magnitude lower than that for stainless steel.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5688068
- Journal Information:
- Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Vol. 9:3; ISSN 0734-2101; ISSN JVTAD
- Country of Publication:
- United States
- Language:
- English
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