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Simulations of Ion Migration in the LCLS RF Gun and Injector [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2012.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators
SLAC National Accelerator Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The motivation for this work was the observed surface contamination of the first LCLS RF gun copper cathode. We will present the results of simulations in regards to ion migration in the LCLS gun. Ions of residual gases will be created by interaction of molecular gas species with the UV drive laser beam and by the electron beam itself. The larger part of those ionized molecules remain in the vicinity of creation, are transported towards beam line walls or away from the cathode. However a small fraction gains enough kinetic energy, focused by RF and magnetic fields and propagates to the cathode, producing an undesirable increase of the cathode's surface work function. Although this fraction is small, during long term operation, this effect may become a significant factor limiting the source performance.
Report Numbers
E 1.99:slac-pub-15114
slac-pub-15114
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Note
Published through SciTech Connect.
06/25/2012.
"slac-pub-15114"
Conf.Proc.C100523:TUPE064,2010
1st International Particle Accelerator Conference: IPAC'10, 23-28 May 2010, Kyoto, Japan.
Brachmann, Axel; Dowell, David.
Funding Information
AC02-76SF00515
View MARC record | catkey: 14676428