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

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.
Authors:
; ; ; ; ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5]
  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. (United States)
  5. SLAC National Accelerator Laboratory, Menlo Park, California 94309 (United States)
Publication Date:
OSTI Identifier:
22308600
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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