Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel

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Electron clouds limit the performance of many major accelerators and storage rings. 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 kV Ion Source Test Stand (STS-500) at LLNL. The experimental electron yield scales with the electronic component (dE{sub e}/dx) of ... continued below

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Covo, M K; Molvik, A; Friedman, A; Westenskow, G; Barnard, J J; Cohen, R et al. March 6, 2006.

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Electron clouds limit the performance of many major accelerators and storage rings. 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 kV 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 and its angular dependence does not follow l/cos({theta}). 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. The experiment extends the range of energy from previous works and the model reproduces the angular dependence and magnitude of the electron yield.

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PDF-file: 21 pages; size: 0.3 Mbytes

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  • Journal Name: Physical Review Special Topics - Accelerator and Beams, vol. 9, no. 6, June 12, 2006, pp. 063201

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  • Report No.: UCRL-JRNL-219620
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 899118
  • Archival Resource Key: ark:/67531/metadc881690

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • March 6, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 9, 2016, 7:48 p.m.

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Covo, M K; Molvik, A; Friedman, A; Westenskow, G; Barnard, J J; Cohen, R et al. Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel, article, March 6, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc881690/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.