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Ar beam induced desorption from different materials at TSL

Malyshev, O. B.; Zajec, B.; Haase, A.; Westerberg, L.; Leandersson, Mats LU ; Bender, M.; Kramer, A.; Kollmus, H. and Reich-Sprenger, H. (2010) In Vacuum 85(2). p.338-343
Abstract
This paper describes new experiments on the heavy ion desorption yield measurements with 5 MeV/u Ar8+ and summarizes all results of experiments with 5 MeV/u Ar8+ performed at The Svedberg Laboratory in Uppsala (Sweden). These results are important for the update and design of the FAIR facility at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt (Germany) where the required increase in beam intensity is limited by ion induced pressure instability. It was shown that lowest desorption yields can be achieved with gold coatings, whereas grazing incident loss increases the desorption yield by roughly an order of magnitude compared to perpendicular loss. The desorption yield of saturated NEG samples was measured to be higher compared... (More)
This paper describes new experiments on the heavy ion desorption yield measurements with 5 MeV/u Ar8+ and summarizes all results of experiments with 5 MeV/u Ar8+ performed at The Svedberg Laboratory in Uppsala (Sweden). These results are important for the update and design of the FAIR facility at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt (Germany) where the required increase in beam intensity is limited by ion induced pressure instability. It was shown that lowest desorption yields can be achieved with gold coatings, whereas grazing incident loss increases the desorption yield by roughly an order of magnitude compared to perpendicular loss. The desorption yield of saturated NEG samples was measured to be higher compared to any non pumping samples. The desorption yield of copper can be lower and higher compared to stainless steel depending on cleaning procedure and sample history. Additionally the secondary electron and ion yield was measured to be a few tens of electrons and ions emitted per projectile impact in backward direction. Their influence on the desorption yield due to secondary effects was less than 5% compared to the primary desorption by the high energetic projectile. (C) 2010 Elsevier Ltd. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Secondary, Vacuum system, Desorption yield, Heavy ions, Gas desorption, particles
in
Vacuum
volume
85
issue
2
pages
338 - 343
publisher
Elsevier
external identifiers
  • wos:000282548700040
  • scopus:77956614679
ISSN
0042-207X
DOI
10.1016/j.vacuum.2010.07.007
language
English
LU publication?
yes
id
06d9d0a2-1d04-4a34-aba6-13a4bb6d9c5b (old id 1726271)
date added to LUP
2010-12-03 15:46:26
date last changed
2018-05-29 09:26:22
@article{06d9d0a2-1d04-4a34-aba6-13a4bb6d9c5b,
  abstract     = {This paper describes new experiments on the heavy ion desorption yield measurements with 5 MeV/u Ar8+ and summarizes all results of experiments with 5 MeV/u Ar8+ performed at The Svedberg Laboratory in Uppsala (Sweden). These results are important for the update and design of the FAIR facility at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt (Germany) where the required increase in beam intensity is limited by ion induced pressure instability. It was shown that lowest desorption yields can be achieved with gold coatings, whereas grazing incident loss increases the desorption yield by roughly an order of magnitude compared to perpendicular loss. The desorption yield of saturated NEG samples was measured to be higher compared to any non pumping samples. The desorption yield of copper can be lower and higher compared to stainless steel depending on cleaning procedure and sample history. Additionally the secondary electron and ion yield was measured to be a few tens of electrons and ions emitted per projectile impact in backward direction. Their influence on the desorption yield due to secondary effects was less than 5% compared to the primary desorption by the high energetic projectile. (C) 2010 Elsevier Ltd. All rights reserved.},
  author       = {Malyshev, O. B. and Zajec, B. and Haase, A. and Westerberg, L. and Leandersson, Mats and Bender, M. and Kramer, A. and Kollmus, H. and Reich-Sprenger, H.},
  issn         = {0042-207X},
  keyword      = {Secondary,Vacuum system,Desorption yield,Heavy ions,Gas desorption,particles},
  language     = {eng},
  number       = {2},
  pages        = {338--343},
  publisher    = {Elsevier},
  series       = {Vacuum},
  title        = {Ar beam induced desorption from different materials at TSL},
  url          = {http://dx.doi.org/10.1016/j.vacuum.2010.07.007},
  volume       = {85},
  year         = {2010},
}