title: Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility.
abstract: 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.
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: T
authors.initials: T
authors.lastname: Döppner
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: D
authors.initials: D
authors.lastname: Kraus
authors.affiliation: Gesellschaft für Schwerionenphysik, Darmstadt, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Neumayer
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: B
authors.initials: B
authors.lastname: Bachmann
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: J
authors.initials: J
authors.lastname: Emig
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: R W
authors.initials: RW
authors.lastname: Falcone
authors.affiliation: SLAC National Accelerator Laboratory, Menlo Park, California 94720, USA.
authors.forename: L B
authors.initials: LB
authors.lastname: Fletcher
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: M
authors.initials: M
authors.lastname: Hardy
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: D H
authors.initials: DH
authors.lastname: Kalantar
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: A L
authors.initials: AL
authors.lastname: Kritcher
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: O L
authors.initials: OL
authors.lastname: Landen
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: T
authors.initials: T
authors.lastname: Ma
authors.affiliation: University of California, Berkeley, California 94720, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Saunders
authors.affiliation: Lawrence Livermore National Laboratory, Livermore, California 94720, USA.
authors.forename: R D
authors.initials: RD
authors.lastname: Wood