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High order reflectivity of highly oriented pyrolytic graphite crystals for x-ray energies up to 22 keV

We used Kr K alpha (12.6 keV), Zr K alpha (15.7 keV), and Ag K alpha (22.2 keV) x-rays, produced by petawatt-class laser pulses, to measure the integrated crystal reflectivity R(int) of flat highly oriented pyrolytic graphite (HOPG) up to the fifth order. The maximum R(int) was observed in first ord...

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Published in:	Review of scientific instruments 2008-10, Vol.79 (10), p.10E311-10E311
Main Authors:	Döppner, T, Neumayer, P, Girard, F, Kugland, N L, Landen, O L, Niemann, C, Glenzer, S H
Format:	Article
Language:	English
Subjects:	07 ISOTOPES AND RADIATION SOURCES CRYSTALS GRAPHITE IMPLOSIONS INERTIAL CONFINEMENT INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY KEV RANGE 10-100 LASERS LIGHT TRANSMISSION PLASMA PLASMA DENSITY PULSES REFLECTIVITY SIGNALS US NATIONAL IGNITION FACILITY X RADIATION X-RAY DIFFRACTION X-RAY SOURCES
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cited_by	cdi_FETCH-LOGICAL-c377t-17163bc84efbdb0a9d52fc39e53f84a54ab9141a5e24982fa2d9e1a48827e88d3
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creator	Döppner, T Neumayer, P Girard, F Kugland, N L Landen, O L Niemann, C Glenzer, S H
description	We used Kr K alpha (12.6 keV), Zr K alpha (15.7 keV), and Ag K alpha (22.2 keV) x-rays, produced by petawatt-class laser pulses, to measure the integrated crystal reflectivity R(int) of flat highly oriented pyrolytic graphite (HOPG) up to the fifth order. The maximum R(int) was observed in first order (3.7 mrad at 12.6 keV), decreasing by a factor of 3-5 for every successive order, and dropping by a factor of 2-2.5 at 22.2 keV. The current study indicates that HOPG crystals are suitable for measuring scattering signals from high energy x-ray sources (E > or = 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.
doi_str_mv	10.1063/1.2966378
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The maximum R(int) was observed in first order (3.7 mrad at 12.6 keV), decreasing by a factor of 3-5 for every successive order, and dropping by a factor of 2-2.5 at 22.2 keV. The current study indicates that HOPG crystals are suitable for measuring scattering signals from high energy x-ray sources (E > or = 20 keV). 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The maximum R(int) was observed in first order (3.7 mrad at 12.6 keV), decreasing by a factor of 3-5 for every successive order, and dropping by a factor of 2-2.5 at 22.2 keV. The current study indicates that HOPG crystals are suitable for measuring scattering signals from high energy x-ray sources (E > or = 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.</abstract><cop>United States</cop><pmid>19044473</pmid><doi>10.1063/1.2966378</doi></addata></record>
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source	American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list); AIP - American Institute of Physics
subjects	07 ISOTOPES AND RADIATION SOURCES CRYSTALS GRAPHITE IMPLOSIONS INERTIAL CONFINEMENT INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY KEV RANGE 10-100 LASERS LIGHT TRANSMISSION PLASMA PLASMA DENSITY PULSES REFLECTIVITY SIGNALS US NATIONAL IGNITION FACILITY X RADIATION X-RAY DIFFRACTION X-RAY SOURCES
title	High order reflectivity of highly oriented pyrolytic graphite crystals for x-ray energies up to 22 keV
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