Photon stimulated desorption measurement of an extruded aluminum beam chamber for the Advanced Photon Source

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The Advanced Photon Source (APS), presently being commisioned, will produce X-ray s of unprecedented brightness. The high energy ring of the APS is a 7 GeV positron storage ring, 1104 meters in circumference designed to operate at less than 10{sup {minus}9} Torr with 300 ma of beam and a greater than 10 hour lifetime. The storage ring vacuum chamber is constructed from an extruded 6063 aluminum alloy. During the construction phase, a 2.34 m long section of the APS extruded aluminum chamber was set up on National Synchrotron Light Source (NSLS) X-ray Beamlline X28A and Photon Stimulated Desorption (PSD) was ... continued below

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8 p.

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Foerster, C.L.; Lanni, C.; Noonan, J.R. & Rosenberg, R.A. December 31, 1995.

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The Advanced Photon Source (APS), presently being commisioned, will produce X-ray s of unprecedented brightness. The high energy ring of the APS is a 7 GeV positron storage ring, 1104 meters in circumference designed to operate at less than 10{sup {minus}9} Torr with 300 ma of beam and a greater than 10 hour lifetime. The storage ring vacuum chamber is constructed from an extruded 6063 aluminum alloy. During the construction phase, a 2.34 m long section of the APS extruded aluminum chamber was set up on National Synchrotron Light Source (NSLS) X-ray Beamlline X28A and Photon Stimulated Desorption (PSD) was measured. Cleaning and preparation of the chamber was identical to that of the APS construction. In addition to the chamber, small samples of M, Be, and Cu were also exposed to white light having a critical energy of 5 keV. In addition to PSD, measurements were made of specular and diffuse scattering of photons. The chamber and samples were each exposed to a dose greater than 10{sup 23} photons per meter. Desorption yields for H{sub 2}, CO, CO{sub 2}, CH{sub 4} and H{sub 2}0 are reported as a function of accumulated flux, critical energy, incidence angle, and preparation. These results are compared with previous results for aluminum on NSLS Beamlline U1OB and PSD results of other laboratories published for aluminum.

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8 p.

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OSTI as DE96004588

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  • 42. National Symposium of the American Vacuum Society (AVS), Minneapolis, MN (United States), 16-20 Oct 1995

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  • Other: DE96004588
  • Report No.: BNL--62542
  • Report No.: CONF-951030--7
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 195788
  • Archival Resource Key: ark:/67531/metadc672071

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  • December 31, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Nov. 24, 2015, 7:19 p.m.

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Foerster, C.L.; Lanni, C.; Noonan, J.R. & Rosenberg, R.A. Photon stimulated desorption measurement of an extruded aluminum beam chamber for the Advanced Photon Source, article, December 31, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc672071/: accessed June 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.