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Open Access Publications from the University of California

Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility.

  • Author(s): Döppner, T
  • Kraus, D
  • Neumayer, P
  • Bachmann, B
  • Emig, J
  • Falcone, RW
  • Fletcher, LB
  • Hardy, M
  • Kalantar, DH
  • Kritcher, AL
  • Landen, OL
  • Ma, T
  • Saunders, AM
  • Wood, RD
  • et al.

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We are developing x-ray Thomson scattering for applications in implosion experiments at the National Ignition Facility. In particular we have designed and fielded MACS, a high-efficiency, gated x-ray spectrometer at 7.5-10 keV [T. Döppner et al., Rev. Sci. Instrum. 85, 11D617 (2014)]. Here we report on two new Bragg crystals based on Highly Oriented Pyrolytic Graphite (HOPG), a flat crystal and a dual-section cylindrically curved crystal. We have performed in situ calibration measurements using a brass foil target, and we used the flat HOPG crystal to measure Mo K-shell emission at 18 keV in 2nd order diffraction. Such high photon energy line emission will be required to penetrate and probe ultra-high-density plasmas or plasmas of mid-Z elements.

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