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Title: Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility

Abstract

The Gamma-to-Electron Magnetic Spectrometer (GEMS) diagnostic is designed to measure the prompt γ-ray energy spectrum during high yield deuterium-tritium (DT) implosions at the National Ignition Facility (NIF). The prompt γ-ray spectrum will provide ‘burn-averaged’ observables, including total DT fusion yield, total areal density (ρR), ablator ρR, and fuel ρR. These burn-averaged observables are unique because they are essentially averaged over 4π, providing a global reference for the line-of-sight-specific measurements typical of x-ray and neutron diagnostics. The GEMS conceptual design meets the physics-based requirements: ΔE/E = 3 - 5% can be achieved in the range of 2 - 25 MeV γ-ray energy. Minimum DT neutron yields required for 15% measurement uncertainty at low-resolution mode are: 5×1014 DT-n for ablator ρR (at 0.2 g/cm2); 2×1015 DT-n for total DT yield (at 4.2×10-5γ /n); and 1×1016 DT-n for fuel ρR (at 1 g/cm2).

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [1];  [1];  [3];  [4];  [1]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. General Atomics, San Diego, CA (United States)
  4. National Security Technologies, LLC. (NSTec), Santa Barbara, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1414367
Report Number(s):
LLNL-JRNL-741517
Journal ID: ISSN 0034-6748; TRN: US1800696
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 85; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Kim, Y., Herrmann, H. W., Jorgenson, H. J., Barlow, D. B., Young, C. S., Stoeffl, W., Casey, D., Clancy, T., Lopez, F. E., Oertel, J. A., Hilsabeck, T., Moy, K., and Batha, S. H. Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility. United States: N. p., 2014. Web. doi:10.1063/1.4892900.
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Kim, Y., Herrmann, H. W., Jorgenson, H. J., Barlow, D. B., Young, C. S., Stoeffl, W., Casey, D., Clancy, T., Lopez, F. E., Oertel, J. A., Hilsabeck, T., Moy, K., & Batha, S. H. Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility. United States. https://doi.org/10.1063/1.4892900
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Kim, Y., Herrmann, H. W., Jorgenson, H. J., Barlow, D. B., Young, C. S., Stoeffl, W., Casey, D., Clancy, T., Lopez, F. E., Oertel, J. A., Hilsabeck, T., Moy, K., and Batha, S. H. Fri . "Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility". United States. https://doi.org/10.1063/1.4892900. https://www.osti.gov/servlets/purl/1414367.
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@article{osti_1414367,
title = {Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility},
author = {Kim, Y. and Herrmann, H. W. and Jorgenson, H. J. and Barlow, D. B. and Young, C. S. and Stoeffl, W. and Casey, D. and Clancy, T. and Lopez, F. E. and Oertel, J. A. and Hilsabeck, T. and Moy, K. and Batha, S. H.},
abstractNote = {The Gamma-to-Electron Magnetic Spectrometer (GEMS) diagnostic is designed to measure the prompt γ-ray energy spectrum during high yield deuterium-tritium (DT) implosions at the National Ignition Facility (NIF). The prompt γ-ray spectrum will provide ‘burn-averaged’ observables, including total DT fusion yield, total areal density (ρR), ablator ρR, and fuel ρR. These burn-averaged observables are unique because they are essentially averaged over 4π, providing a global reference for the line-of-sight-specific measurements typical of x-ray and neutron diagnostics. The GEMS conceptual design meets the physics-based requirements: ΔE/E = 3 - 5% can be achieved in the range of 2 - 25 MeV γ-ray energy. Minimum DT neutron yields required for 15% measurement uncertainty at low-resolution mode are: 5×1014 DT-n for ablator ρR (at 0.2 g/cm2); 2×1015 DT-n for total DT yield (at 4.2×10-5γ /n); and 1×1016 DT-n for fuel ρR (at 1 g/cm2).},
doi = {10.1063/1.4892900},
journal = {Review of Scientific Instruments},
number = 11,
volume = 85,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.4892900
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Cited by: 12 works
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Works referenced in this record:

A study of 14N using the 13C(d, n)14N reaction
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The fusion diagnostic gamma experiment: A high-bandwidth fusion diagnostic of the National Ignition Facility
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  • Moran, Michael J.
  • Review of Scientific Instruments, Vol. 70, Issue 1
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Measurement of areal density in the ablators of inertial-confinement-fusion capsules via detection of ablator (n, n′γ) gamma-ray emission
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  • Hoffman, N. M.; Herrmann, H. W.; Kim, Y. H.
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  • DOI: 10.1063/1.4799799

Gamma-to-electron magnetic spectrometer (GEMS): An energy-resolved γ-ray diagnostic for the National Ignition Facility
journal, October 2012

  • Kim, Y.; Herrmann, H. W.; Hilsabeck, T. J.
  • Review of Scientific Instruments, Vol. 83, Issue 10
  • DOI: 10.1063/1.4738650

Determination of the deuterium-tritium branching ratio based on inertial confinement fusion implosions
journal, June 2012

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    journal, August 2019

    • Tiwari, G.; Kupfer, R.; Jiao, X.
    • Review of Scientific Instruments, Vol. 90, Issue 8
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    Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research
    journal, February 2018

    • Cerjan, Ch J.; Bernstein, L.; Hopkins, L. Berzak
    • Journal of Physics G: Nuclear and Particle Physics, Vol. 45, Issue 3
    • DOI: 10.1088/1361-6471/aa8693
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