Boron nitride protective coating of beryllium window surfaces

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The use of beryllium windows on white synchrotron radiation beamlines is constrained by the fact that the downstream surfaces of these windows should not be exposed to ambient atmosphere. They should, rather, be protected by a tail-piece under vacuum or containing helium atmosphere. This tailpiece is typically capped by Kapton (3M Corporation, St. Paul, MN) or aluminum foil. The reason for such an arrangement is due to the health risk associated with contaminants (BeO) which from on the exposed beryllium window surfaces and due to possible loss of integrity of the windows. Such a tail-piece may, however, add unwanted complications ... continued below

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Pages: (21 p)

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Gmuer, N.F. December 1, 1991.

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Description

The use of beryllium windows on white synchrotron radiation beamlines is constrained by the fact that the downstream surfaces of these windows should not be exposed to ambient atmosphere. They should, rather, be protected by a tail-piece under vacuum or containing helium atmosphere. This tailpiece is typically capped by Kapton (3M Corporation, St. Paul, MN) or aluminum foil. The reason for such an arrangement is due to the health risk associated with contaminants (BeO) which from on the exposed beryllium window surfaces and due to possible loss of integrity of the windows. Such a tail-piece may, however, add unwanted complications to the beamline in the form of vacuum pumps or helium supplies and their related monitoring systems. The Kapton windows may burn through in the case of high intensity beams and lower energy radiation may be absorbed in the case of aluminum foil windows. A more ideal situation would be to provide a coating for the exposed beryllium window surface, sealing it off from the atmosphere, thus preventing contamination and/or degradation of the window, and eliminating the need for helium or vacuum equipment.

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Pages: (21 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 7. national conference and exhibition on synchrotron radiation instrumentation, Baton Rouge, LA (United States), 28-31 Oct 1991

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  • Other: DE92007632
  • Report No.: BNL-46597
  • Report No.: CONF-9110146--12
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5897436
  • Archival Resource Key: ark:/67531/metadc1098687

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  • December 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • April 20, 2018, 7:03 p.m.

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Gmuer, N.F. Boron nitride protective coating of beryllium window surfaces, article, December 1, 1991; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1098687/: accessed May 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.