High order reflectivity of graphite (HOPG) crystals for x ray energies up to 22 keV

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We used Kr K{alpha} (12.6 keV) and Ag K{alpha} (22.1 keV) x-rays, produced by petawatt class laser pulses interacting with a Kr gas jet and a silver foil, to measure the integrated crystal reflectivity of flat Highly Oriented Pyrolytic Graphite (HOPG) up to fifth order. The reflectivity in fourth order is lower by a factor of 50 when compared to first order diffraction. In second order the integrated reflectivity decreases from 1.3 mrad at 12.6 keV to 0.5 mrad at 22.1 keV. The current study indicates that HOPG crystals are suitable for measuring scattering signals from high energy x ray ... continued below

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Doeppner, T; Neumayer, P; Girard, F; Kugland, N L; Landen, O L; Niemann, C et al. April 30, 2008.

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We used Kr K{alpha} (12.6 keV) and Ag K{alpha} (22.1 keV) x-rays, produced by petawatt class laser pulses interacting with a Kr gas jet and a silver foil, to measure the integrated crystal reflectivity of flat Highly Oriented Pyrolytic Graphite (HOPG) up to fifth order. The reflectivity in fourth order is lower by a factor of 50 when compared to first order diffraction. In second order the integrated reflectivity decreases from 1.3 mrad at 12.6 keV to 0.5 mrad at 22.1 keV. The current study indicates that HOPG crystals are suitable for measuring scattering signals from high energy x ray sources (E {ge} 20 keV). These energies are required to penetrate through the high density plasma conditions encountered in inertial confinement fusion capsule implosions on the National Ignition Facility.

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  • Presented at: High Temperature Plasma Diagnostics, Albuquerque, NM, United States, May 11 - May 15, 2008

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  • Report No.: LLNL-PROC-403603
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 938493
  • Archival Resource Key: ark:/67531/metadc902017

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  • April 30, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 29, 2016, 12:35 p.m.

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Doeppner, T; Neumayer, P; Girard, F; Kugland, N L; Landen, O L; Niemann, C et al. High order reflectivity of graphite (HOPG) crystals for x ray energies up to 22 keV, article, April 30, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc902017/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.