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Argon and argon-oxygen glow discharge cleaning of the Main Ring beam pipe [electronic resource].

Published
Batavia, Ill. : Fermi National Accelerator Laboratory, 1989.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 9 : digital, PDF file
Additional Creators
Fermi National Accelerator Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This report presents the experimental results from the argon and argon-oxygen gas mixture glow discharge in the Main Ring beam pipe and is a follow-up to the proposal for vacuum improvements of the Main Ring magnets and straight sections and the warm Tevatron straight sections. Glow discharge was used in the experiment in order to clean the vacuum system instead of bakeout which could only be performed with great difficulty or not at all. It is a relatively simple and very effective method. The glow discharge occurs under specific gas pressures (10--120 mTorr) and current flows (10/sup /minus/5/ /minus/ 10/sup /minus/1/ A) through gas excitation and formation of plasma conditions. Deexcitation of the gas molecules produces visible light. Several mechanisms have been proposed to explain the glow discharge cleaning process. Ions can sputter adsorbed molecules or atoms at the cathode surface and even produce lattice damage extending several monolayers below the surface. The glow discharge has already been extensively used for vacuum improvements in accelerators. 9 refs.
Report Numbers
E 1.99:fnal-tm-1566
fnal-tm-1566
Subject(s)
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Note
Published through SciTech Connect.
02/15/1989.
"fnal-tm-1566"
"DE89011491"
Trbojevic, D.; Pastore, N.
Funding Information
AC02-76CH03000
View MARC record | catkey: 14696644