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APS » Journals » Phys. Rev. ST Accel. Beams » Volume 10 » Issue 9
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Phys. Rev. ST Accel. Beams 10, 093201 (2007) [9 pages]

Time-resolved measurements of desorbed gas during 1-MeV K+ pulsed beam deposition in a stainless steel target

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F. M. Bieniosek*, L. R. Prost†, and P. A. Seidl
Lawrence Berkeley National Laboratory, Heavy Ion Fusion Science Virtual National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA

A. W. Molvik and M. Kireeff Covo
Lawrence Livermore National Laboratory, Heavy Ion Fusion Science Virtual National Laboratory, Livermore, California 94550, USA

Received 3 April 2007; published 5 September 2007

Measurements were made of the density, species, and velocity of the desorbed gas cloud on intense K+ beam bombardment of a stainless steel target. Residual gas analyzer measurements indicate that the gas cloud consists of predominantly H2. Energy analyzer measurements of doubly ionized beam ions show that the ratio of hydrogen gas production to beam density was approximately 3000  molecules/ion at normal incidence. Optical measurements of the evolution of the gas cloud during the beam pulse show a distribution with an average expansion velocity of about 0.5  mm/μs. Comparison is made with a simple model of the gas cloud behavior.

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevSTAB.10.093201
DOI:
10.1103/PhysRevSTAB.10.093201
PACS:
52.59.−f, 52.70.Kz, 52.58.Hm

*fmbieniosek@lbl.gov

†Current address: Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA.

 
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