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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 in this paper 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:
 [1];  [2];  [3];  [1];  [1];  [4];  [5];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [2];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Gesellschaft fur Schwerionenphysik, Darmstadt (Germany)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1360157
Grant/Contract Number:
AC02-76SF00515; AC52-07NA27344; 13-ERD-073
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; X-ray spectrometers; X-ray detectors; Calibration; Molybdenum; Copper

Citation Formats

Döppner, T., Kraus, D., Neumayer, P., Bachmann, B., Emig, J., Falcone, R. W., Fletcher, L. B., Hardy, M., Kalantar, D. H., Kritcher, A. L., Landen, O. L., Ma, T., Saunders, A. M., and Wood, R. D. Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4959874.
Döppner, T., Kraus, D., Neumayer, P., Bachmann, B., Emig, J., Falcone, R. W., Fletcher, L. B., Hardy, M., Kalantar, D. H., Kritcher, A. L., Landen, O. L., Ma, T., Saunders, A. M., & Wood, R. D. Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility. United States. doi:10.1063/1.4959874.
Döppner, T., Kraus, D., Neumayer, P., Bachmann, B., Emig, J., Falcone, R. W., Fletcher, L. B., Hardy, M., Kalantar, D. H., Kritcher, A. L., Landen, O. L., Ma, T., Saunders, A. M., and Wood, R. D. 2016. "Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility". United States. doi:10.1063/1.4959874. https://www.osti.gov/servlets/purl/1360157.
@article{osti_1360157,
title = {Improving a high-efficiency, gated spectrometer for x-ray Thomson scattering experiments at the National Ignition Facility},
author = {Döppner, T. and Kraus, D. and Neumayer, P. and Bachmann, B. and Emig, J. and Falcone, R. W. and Fletcher, L. B. and Hardy, M. and Kalantar, D. H. and Kritcher, A. L. and Landen, O. L. and Ma, T. and Saunders, A. M. and Wood, R. D.},
abstractNote = {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 in this paper 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.},
doi = {10.1063/1.4959874},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
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