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Title: Simulation study of enhancing laser driven multi-keV line-radiation through application of external magnetic fields

Abstract

Here, we present a path forward for enhancing laser driven, multi-keV line-radiation from mid- to high-Z, sub-quarter-critical density, non-equilibrium plasmas through inhibited thermal transport in the presence of an externally generated magnetic field. Preliminary simulations with Kr and Ag suggest that as much as 50%–100% increases in peak electron temperatures are possible—without any changes in laser drive conditions—with magnetized interactions. The increase in temperature results in ~2–3× enhancements in laser-to-x-ray conversion efficiency for K-shell emission with simultaneous ≲4× reduction in L-shell emission using current field generation capabilities on the Omega laser and near-term capabilities on the National Ignition Facility laser. Increased plasma temperatures and enhanced K-shell emission are observed to come at the cost of degraded volumetric heating. Such enhancements in high-photon-energy x-ray sources could expand the existing laser platforms for increasingly penetrating x-ray radiography.

Authors:
 [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1357372
Alternate Identifier(s):
OSTI ID: 1329490
Report Number(s):
LLNL-JRNL-692158
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION

Citation Formats

Kemp, G. E., Colvin, J. D., Blue, B. E., and Fournier, K. B. Simulation study of enhancing laser driven multi-keV line-radiation through application of external magnetic fields. United States: N. p., 2016. Web. doi:10.1063/1.4965236.
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Kemp, G. E., Colvin, J. D., Blue, B. E., & Fournier, K. B. Simulation study of enhancing laser driven multi-keV line-radiation through application of external magnetic fields. United States. https://doi.org/10.1063/1.4965236
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Kemp, G. E., Colvin, J. D., Blue, B. E., and Fournier, K. B. Thu . "Simulation study of enhancing laser driven multi-keV line-radiation through application of external magnetic fields". United States. https://doi.org/10.1063/1.4965236. https://www.osti.gov/servlets/purl/1357372.
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@article{osti_1357372,
title = {Simulation study of enhancing laser driven multi-keV line-radiation through application of external magnetic fields},
author = {Kemp, G. E. and Colvin, J. D. and Blue, B. E. and Fournier, K. B.},
abstractNote = {Here, we present a path forward for enhancing laser driven, multi-keV line-radiation from mid- to high-Z, sub-quarter-critical density, non-equilibrium plasmas through inhibited thermal transport in the presence of an externally generated magnetic field. Preliminary simulations with Kr and Ag suggest that as much as 50%–100% increases in peak electron temperatures are possible—without any changes in laser drive conditions—with magnetized interactions. The increase in temperature results in ~2–3× enhancements in laser-to-x-ray conversion efficiency for K-shell emission with simultaneous ≲4× reduction in L-shell emission using current field generation capabilities on the Omega laser and near-term capabilities on the National Ignition Facility laser. Increased plasma temperatures and enhanced K-shell emission are observed to come at the cost of degraded volumetric heating. Such enhancements in high-photon-energy x-ray sources could expand the existing laser platforms for increasingly penetrating x-ray radiography.},
doi = {10.1063/1.4965236},
journal = {Physics of Plasmas},
number = 10,
volume = 23,
place = {United States},
year = {Thu Oct 20 00:00:00 EDT 2016},
month = {Thu Oct 20 00:00:00 EDT 2016}
}
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https://doi.org/10.1063/1.4965236
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    Works referencing / citing this record:

    Nernst thermomagnetic waves in magnetized high energy density plasmas
    journal, November 2019

    • Velikovich, A. L.; Giuliani, J. L.; Zalesak, S. T.
    • Physics of Plasmas, Vol. 26, Issue 11
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    • Plasma Physics and Controlled Fusion, Vol. 60, Issue 5
    • DOI: 10.1088/1361-6587/aab2e6
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