Beam Energy Scaling on Ion-Induced Electron Yield from K+ Impacton Stainless Steel
Electron clouds limit the performance of many major accelerators. Significant quantities of electrons result when halo ions are lost to beam tubes, generating gas which can be ionized and ion-induced electrons that can multiply and accumulate, causing degradation or loss of the ion beam. In order to understand the physical mechanisms of ion-induced electron production, experiments studied the impact of 50 to 400 keV K{sup +} ions on stainless steel surfaces near grazing incidence, using the 500 kilovolts Ion Source Test Stand (STS-500) at LLNL. The experimental electron yield scales with the electronic component (dE{sub e}/dx) of the stopping power. A theoretical model is developed, using TRIM code to evaluate dE{sub e}/dx at several depths in the target, to estimate the electron yield, which is compared with the experimental results.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of AdvancedScientific Computing Research. Office of Fusion Energy Sciences, LawrenceLivermore National Laboratory
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 893745
- Report Number(s):
- LBNL-59523; HIFAN 1439; R&D Project: Z41003; BnR: AT5015031; TRN: US0606079
- Journal Information:
- Physical Review Special Topics, Vol. 9; Related Information: Journal Publication Date: 2006
- Country of Publication:
- United States
- Language:
- English
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