In:
Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, American Vacuum Society, Vol. 13, No. 4 ( 1995-07-01), p. 1994-1998
Abstract:
Photodesorption of gas, particularly H2, by synchrotron radiation in the proposed next generation of superconducting proton colliders is a critical issue confronting the design of the vacuum system. As an initial step in understanding the source of this hydrogen, we report measurements of the surface and bulk concentrations of hydrogen in candidate beam tube materials and compare the surface concentration to the amount of H2 desorbed in photodesorption experiments. Hydrogen profiling measurements using the 6.4 MeV H(15N,αγ) 12C resonant nuclear reaction were performed on representative vacuum system materials including stainless steel, stainless steel electroplated with copper, and high purity bulk copper. All of the Cu samples examined had a hydrogen-rich surface layer & lt;100 Å thick containing 2–5×1016 H atoms/cm2 and a bulk concentration of approximately 1% atomic hydrogen.
Type of Medium:
Online Resource
ISSN:
0734-2101
,
1520-8559
Language:
English
Publisher:
American Vacuum Society
Publication Date:
1995
detail.hit.zdb_id:
1475424-1
detail.hit.zdb_id:
797704-9
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