Qualification of a high-efficiency, gated spectrometer for x-ray Thomson scattering on the National Ignition Facility

Journal Article · Sat Nov 15 00:00:00 EST 2014 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4890253· OSTI ID:22308600

Döppner, T.; Kritcher, A. L.; Bachmann, B.; Burns, S.; Hawreliak, J.; House, A.; Landen, O. L.; LePape, S.; Ma, T.; Pak, A.; Swift, D. ^[1]; Neumayer, P. ^[2]; Kraus, D. ^[3]; Falcone, R. W. ^[3]; Glenzer, S. H. ^[4]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Gesellschaft für Schwerionenphysik, 64291 Darmstadt (Germany)
3. University of California, Berkeley, California 94720 (United States)
4. SLAC National Accelerator Laboratory, Menlo Park, California 94309 (United States)

We have designed, built, and successfully fielded a highly efficient and gated Bragg crystal spectrometer for x-ray Thomson scattering measurements on the National Ignition Facility (NIF). It utilizes a cylindrically curved Highly Oriented Pyrolytic Graphite crystal. Its spectral range of 7.4–10 keV is optimized for scattering experiments using a Zn He-α x-ray probe at 9.0 keV or Mo K-shell line emission around 18 keV in second diffraction order. The spectrometer has been designed as a diagnostic instrument manipulator-based instrument for the NIF target chamber at the Lawrence Livermore National Laboratory, USA. Here, we report on details of the spectrometer snout, its novel debris shield configuration and an in situ spectral calibration experiment with a Brass foil target, which demonstrated a spectral resolution of E/ΔE = 220 at 9.8 keV.

• OSTI ID: 22308600
• Journal Information: Review of Scientific Instruments, Vol. 85, Issue 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BRAGG REFLECTION
BRASS
CALIBRATION
CRYSTALS
DIFFRACTION
EFFICIENCY
GRAPHITE
HELIUM
K SHELL
KEV RANGE
LAWRENCE LIVERMORE NATIONAL LABORATORY
PROBES
RESOLUTION
SPECTROMETERS
TARGET CHAMBERS
THOMSON SCATTERING
US NATIONAL IGNITION FACILITY
X RADIATION
ZINC