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

Journal Article · Wed May 01 04:00:00 EDT 1996 · Journal of Vacuum Science and Technology, A

DOI:https://doi.org/10.1116/1.579940· OSTI ID:284663

Foerster, C L; Lanni, C ^[1]; Noonan, J R; Rosenberg, R A ^[2]

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1. Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Argonne National Laboratory, Argonne, Illinois 60439 (United States)

The Advanced Photon Source (APS), presently being commissioned, will produce x rays of unprecedented brightness. The high energy ring of the APS is a 7 GeV positron storage ring, 1104 m in circumference designed to operate at less than 10{sup {minus}9} Torr with 300 mA of beam and a greater than 10 h 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 Beamline 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 Al, Be, and Cu were also exposed to white light having a critical energy of 5 keV. In addition to PSD, measurements were made of the specular and diffuse scattering of photons. The chamber and samples were each exposed to a dose greater than 10{sup 23} photons per m. Desorption yields for H{sub 2}, CO, CO{sub 2}, CH{sub 4}, and H{sub 2}O 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 Beamline U10B and PSD results of other laboratories published for aluminum. {copyright} {ital 1996 American Vacuum Society}

• Research Organization: Brookhaven National Laboratory
• DOE Contract Number: AC02-76CH00016; W-31109-ENG-38
• OSTI ID: 284663
• Report Number(s): CONF-9510385--
• Journal Information: Journal of Vacuum Science and Technology, A, Journal Name: Journal of Vacuum Science and Technology, A Journal Issue: 3 Vol. 14; ISSN JVTAD6; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ADVANCED PHOTON SOURCE
ALUMINIUM
ALUMINIUM ALLOYS
BERYLLIUM
COPPER
DESORPTION
RADIATION EFFECTS
SORPTIVE PROPERTIES
SYNCHROTRON RADIATION
VACUUM SYSTEMS
X RADIATION