Processing of O.F.E. copper beam chambers for PEP-II high energy ring

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Using laboratory scale and full size PEP-II vacuum chambers, chemical cleaning, glow discharge and thermal process effects were evaluated using surface analysis by x-ray photoelectron spectroscopy (XPS). These processes were optimized to reduce surface carbon and thereby minimize photodesorption gas loads. The relation of surface carbon to ion dose was investigated and compared for pure argon, 5% oxygen in argon, and pure hydrogen plasmas. Argon incorporation was noted only when the copper was oxidized in the mixed gas. Surfaces, stable in ambient atmosphere, were obtained having surface carbon values less than 10%. These optimized recipes will be used in processing ... continued below

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5 p.

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Hoyt, E.; Hoyt, M.; Kirby, R.; Perkins, C.; Wright, D. & Farvid, A. August 1, 1995.

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Description

Using laboratory scale and full size PEP-II vacuum chambers, chemical cleaning, glow discharge and thermal process effects were evaluated using surface analysis by x-ray photoelectron spectroscopy (XPS). These processes were optimized to reduce surface carbon and thereby minimize photodesorption gas loads. The relation of surface carbon to ion dose was investigated and compared for pure argon, 5% oxygen in argon, and pure hydrogen plasmas. Argon incorporation was noted only when the copper was oxidized in the mixed gas. Surfaces, stable in ambient atmosphere, were obtained having surface carbon values less than 10%. These optimized recipes will be used in processing copper vacuum chambers for the PEP-II B-Factory.

Physical Description

5 p.

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OSTI as DE97009079

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE97009079
  • Report No.: SLAC-PUB--95-6990
  • Report No.: CONF-950512--
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 620983
  • Archival Resource Key: ark:/67531/metadc697554

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Office of Scientific & Technical Information Technical Reports

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  • August 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 9, 2016, 12:30 p.m.

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Hoyt, E.; Hoyt, M.; Kirby, R.; Perkins, C.; Wright, D. & Farvid, A. Processing of O.F.E. copper beam chambers for PEP-II high energy ring, article, August 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc697554/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.