{sup 15}N hydrogen depth profiling measurements of candidate superconducting supercollider beam pipe materials
- Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
- Department of Physics, State University of New York (SUNY) at Albany, Albany, New York 12222 (United States)
- Superconducting Super Collider Laboratory, Dallas, Texas 75237 (United States)
Photodesorption of gas, particularly H{sub 2}, 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 H{sub 2} desorbed in photodesorption experiments. Hydrogen profiling measurements using the 6.4 MeV H({sup 15}N,{alpha}{gamma}){sup 12}C 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 A thick containing 2--5{times}10{sup 16} H atoms/cm{sup 2} and a bulk concentration of approximately 1% atomic hydrogen. {copyright} {ital 1995} {ital American} {ital Vacuum} {ital Society}
- DOE Contract Number:
- AC35-89ER40486
- OSTI ID:
- 69452
- Journal Information:
- Journal of Vacuum Science and Technology, A, Journal Name: Journal of Vacuum Science and Technology, A Journal Issue: 4 Vol. 13; ISSN JVTAD6; ISSN 0734-2101
- Country of Publication:
- United States
- Language:
- English
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