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Nonevaporable getter investigation at the National Synchrotron Light Source

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2 Author(s)
Halama, Henry J. ; Brookhaven National Laboratory, Upton, New York 11973 ; Guo, Yaohua

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We report H2, CO, and CO2 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% H2, 35% CO, and 15% CO2 is used in all measurements. Initial measured pumping speeds of ≫450 l m-1 s-1 decrease to 200 and 100 l m-1 s-1 for H2 and CO, respectively, after 70 air exposures. A further drop to 50 l m-1 s-1 for CO occurs at CO loading of 1×10-2 Torr l m-1. CO2 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.

Published in:

Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films  (Volume:9 ,  Issue: 3 )

Date of Publication:

May 1991

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