High-heat-load studies of silicon and diamond monochromators using the APS/CHESS prototype undulator Metadata

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Title

  • Main Title High-heat-load studies of silicon and diamond monochromators using the APS/CHESS prototype undulator

Creator

  • Author: Mills, D.M.
    Creator Type: Personal
  • Author: Lee, W.K.
    Creator Type: Personal
  • Author: Smither, R.K.
    Creator Type: Personal
  • Author: Fernandez, P.B.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: USDOE, Washington, DC (United States)

Publisher

  • Name: Argonne National Laboratory
    Place of Publication: Illinois
    Additional Info: Argonne National Lab., IL (United States)

Date

  • Creation: 1994-09-16

Language

  • English

Description

  • Content Description: The results of the latest high-heat-load studies made on the APS/CHESS prototype undulator are summarized. Four different crystals were tested: two slotted, symmetrically cut silicon crystals and a core-drilled, asymmetrically cut silicon crystal and a diamond crystal that was jet cooled using water. The purpose of the silicon crystal tests was to reevaluate the surface power loading at which appreciable degradation of the diffraction efficiency was observed. The diamond tests, allotted only a brief period of time during the testing period, were our first attempt at using diamonds for high-heat-flux x-ray monochromators and were performed primarily to gain first-hand experience with diamond monochromators. Measurements with the silicon crystal at 5 keV reconfirmed our previous measurements of performance degradation at around 4-6 watts/mm{sup 2} using liquid gallium with slotted coolant channels. A value of only 2 watts/mm{sup 2} was observed to cause a degradation of the diffraction performance at 15 keV with the same crystals due to the increased sensitivity to strain because of the reduced Darwin widths. The performance of the asymmetric crystal, with its core-drilled coolant channels, was not found to be as good as that of the slotted crystals. This was probably due to poorer heat transfer properties of the core-drilled geometry in combination with the narrowing of the rocking curves because of the asymmetric cut. Fabrication issues for construction of the gallium-cooled crystals is also discussed. Although the diamonds were only successfully tested at low total power the results were very encouraging and motivated us to accelerate our program on the use of diamonds for high-heat-load monochromators.
  • Physical Description: 44 p.

Subject

  • Keyword: Advanced Photon Source
  • STI Subject Categories: 43 Particle Accelerators
  • Keyword: Monochromators
  • Keyword: Diamonds
  • Keyword: Thermal Analysis
  • Keyword: Wiggler Magnets
  • Keyword: Silicon

Source

  • Other Information: PBD: 16 Sep 1994

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE95015212
  • Report No.: LS--238
  • Grant Number: W-31-109-ENG-38
  • DOI: 10.2172/90418
  • Office of Scientific & Technical Information Report Number: 90418
  • Archival Resource Key: ark:/67531/metadc791889

Note

  • Display Note: INIS; OSTI as DE95015212