Ion beam induced surface graphitization of CVD diamond for x-ray beam position monitor applications

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The Advanced Photon Source at ANL is a third-generation synchrotron facility that generates powerful x-ray beams on its undulator beamlines. It is important to know the position and angle of the x- ray beam during experiments. Due to very high heat flux levels, several patented x-ray beam position monitors (XBPM) exploiting chemical vapor deposition (CVD) diamond have been developed. These XBPMs have a thin layer of low-atomic-mass metallic coating so that photoemission from the x rays generate a minute but measurable current for position determination. Graphitization of the CVD diamond surface creates a very thin, intrinsic and conducting layer that ... continued below

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20 p.

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Liu, Chian; Shu, D.; Kuzay, T.M.; Wen, L. & Melendres, C.A. December 31, 1996.

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Description

The Advanced Photon Source at ANL is a third-generation synchrotron facility that generates powerful x-ray beams on its undulator beamlines. It is important to know the position and angle of the x- ray beam during experiments. Due to very high heat flux levels, several patented x-ray beam position monitors (XBPM) exploiting chemical vapor deposition (CVD) diamond have been developed. These XBPMs have a thin layer of low-atomic-mass metallic coating so that photoemission from the x rays generate a minute but measurable current for position determination. Graphitization of the CVD diamond surface creates a very thin, intrinsic and conducting layer that can stand much higher temperatures and minimal x-ray transmission losses compared to the coated metallic layers. In this paper, a laboratory sputter ion source was used to transform selected surfaces of a CVD diamond substrate into graphite. The effect of 1-5 keV argon ion bombardment on CVD diamond surfaces at various target temperatures from 200 to 500 C was studied using Auger electron spectroscopy and in-situ electrical resistivity measurements. Graphitization after the ion bombardment has been confirmed and optimum conditions for graphitization studied. Raman spectroscopy was used to identify the overall diamond structure in the bulk of CVD diamond substrate after the ion bombardments. It was found that target temperature plays an important role in stability and electrical conductivity of the irradiated CVD diamonds.

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20 p.

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INIS; OSTI as DE97001399

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  • 43. national symposium of the American Vacuum Society (AVS), Philadelphia, PA (United States), 14-18 Oct 1996

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  • Other: DE97001399
  • Report No.: ANL/XFD/CP--90145
  • Report No.: CONF-961002--5
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 434345
  • Archival Resource Key: ark:/67531/metadc688226

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 31, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Dec. 14, 2015, 6:55 p.m.

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Liu, Chian; Shu, D.; Kuzay, T.M.; Wen, L. & Melendres, C.A. Ion beam induced surface graphitization of CVD diamond for x-ray beam position monitor applications, article, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc688226/: accessed October 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.