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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Bibliographic Details
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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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2966378