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

Abstract

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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
899118
Report Number(s):
UCRL-JRNL-219620
TRN: US0701740
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Special Topics - Accelerator and Beams, vol. 9, no. 6, June 12, 2006, pp. 063201
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 29 ENERGY PLANNING, POLICY AND ECONOMY; 36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; CLOUDS; ELECTRONS; ION BEAMS; ION SOURCES; LAWRENCE LIVERMORE NATIONAL LABORATORY; PERFORMANCE; PRODUCTION; STAINLESS STEELS; STOPPING POWER; STORAGE RINGS

Citation Formats

Covo, M K, Molvik, A, Friedman, A, Westenskow, G, Barnard, J J, Cohen, R, Seidl, P, Kwan, J W, Logan, G, Baca, D, Bieniosek, F, Celata, C M, Vay, J, and Vujic, J L. Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel. United States: N. p., 2006. Web.
Covo, M K, Molvik, A, Friedman, A, Westenskow, G, Barnard, J J, Cohen, R, Seidl, P, Kwan, J W, Logan, G, Baca, D, Bieniosek, F, Celata, C M, Vay, J, & Vujic, J L. Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel. United States.
Covo, M K, Molvik, A, Friedman, A, Westenskow, G, Barnard, J J, Cohen, R, Seidl, P, Kwan, J W, Logan, G, Baca, D, Bieniosek, F, Celata, C M, Vay, J, and Vujic, J L. Mon . "Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel". United States. doi:. https://www.osti.gov/servlets/purl/899118.
@article{osti_899118,
title = {Beam Energy Scaling of Ion-Induced Electron Yield from K+ Impact on Stainless Steel},
author = {Covo, M K and Molvik, A and Friedman, A and Westenskow, G and Barnard, J J and Cohen, R and Seidl, P and Kwan, J W and Logan, G and Baca, D and Bieniosek, F and Celata, C M and Vay, J and Vujic, J L},
abstractNote = {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.},
doi = {},
journal = {Physical Review Special Topics - Accelerator and Beams, vol. 9, no. 6, June 12, 2006, pp. 063201},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2006},
month = {Mon Mar 06 00:00:00 EST 2006}
}