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

Journal Article · Wed Oct 15 04:00:00 EDT 2008 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2966378· OSTI ID:21266476

Doeppner, T; Neumayer, P; Landen, O L; Glenzer, S H ^[1]; Girard, F ^[2]; Kugland, N L; Niemann, C ^[1]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)
2. Commissariat a l'Energie Atomique, Boite Postale 12, 91680 Bruyeres-le-Chatel (France)

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{sub int} of flat highly oriented pyrolytic graphite (HOPG) up to the fifth order. The maximum R{sub 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{>=}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.

• OSTI ID: 21266476
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 79; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

07 ISOTOPE AND RADIATION SOURCES
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CRYSTALS
GRAPHITE
IMPLOSIONS
INERTIAL CONFINEMENT
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