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Title: Using L-shell x-ray spectra to determine conditions of non-local thermal dynamic equilibrium plasmas

Abstract

K-shell x-ray spectra of Li- to H-like ions have long been used to determine plasma conditions. The ratio of integrated line intensities is used to determine the temperature. At the density of non-local thermal dynamic equilibrium (NLTE) plasmas (ne ≈ 10 21 cm -3), the K-shell spectrum is not very sensitive to density. We propose using the L-shell emission of open L-shell ions (C- to Li-like) as an alternative to determine both temperature and density of NLTE plasmas. First, the L-shell models of a mid-Z material need to be verified against the temperatures obtained using a K-shell spectrum of a low-Z material. A buried layer platform is being developed at the OMEGA laser to study the open L-shell spectra of NLTE plasmas of mid-Z materials. Studies have been done using a 250 μm diameter dot composed of a layer of 1200 Å thick Zn between two 600 Å thick layers of Ti, in the center of a 1000 μm diameter, 13 μm thick beryllium tamper. Lasers heat the target from both sides for up to 3 ns. The size of the emitting volume vs time was measured with x-ray imaging (face-on and side-on) to determine the density. The temperature wasmore » measured from the Ti K-shell spectra. The use of this platform for the verification of atomic L-shell models is discussed.« less

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1545513
Alternate Identifier(s):
OSTI ID: 1465241
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Conference: 22. Topical Conference on High-Temperature Plasma Diagnostics , San Diego, CA (United States), Apr. 2018; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE

Citation Formats

Marley, E. V., Liedahl, D. A., Schneider, M. B., Heeter, R. F., Jarrott, L. C., Mauche, C. W., Kemp, G. E., Foord, M. E., Frank, Y., Widmann, K., and Emig, J. Using L-shell x-ray spectra to determine conditions of non-local thermal dynamic equilibrium plasmas. United States: N. p., 2018. Web. doi:10.1063/1.5039357.
Marley, E. V., Liedahl, D. A., Schneider, M. B., Heeter, R. F., Jarrott, L. C., Mauche, C. W., Kemp, G. E., Foord, M. E., Frank, Y., Widmann, K., & Emig, J. Using L-shell x-ray spectra to determine conditions of non-local thermal dynamic equilibrium plasmas. United States. doi:10.1063/1.5039357.
Marley, E. V., Liedahl, D. A., Schneider, M. B., Heeter, R. F., Jarrott, L. C., Mauche, C. W., Kemp, G. E., Foord, M. E., Frank, Y., Widmann, K., and Emig, J. Mon . "Using L-shell x-ray spectra to determine conditions of non-local thermal dynamic equilibrium plasmas". United States. doi:10.1063/1.5039357. https://www.osti.gov/servlets/purl/1545513.
@article{osti_1545513,
title = {Using L-shell x-ray spectra to determine conditions of non-local thermal dynamic equilibrium plasmas},
author = {Marley, E. V. and Liedahl, D. A. and Schneider, M. B. and Heeter, R. F. and Jarrott, L. C. and Mauche, C. W. and Kemp, G. E. and Foord, M. E. and Frank, Y. and Widmann, K. and Emig, J.},
abstractNote = {K-shell x-ray spectra of Li- to H-like ions have long been used to determine plasma conditions. The ratio of integrated line intensities is used to determine the temperature. At the density of non-local thermal dynamic equilibrium (NLTE) plasmas (ne ≈ 1021 cm-3), the K-shell spectrum is not very sensitive to density. We propose using the L-shell emission of open L-shell ions (C- to Li-like) as an alternative to determine both temperature and density of NLTE plasmas. First, the L-shell models of a mid-Z material need to be verified against the temperatures obtained using a K-shell spectrum of a low-Z material. A buried layer platform is being developed at the OMEGA laser to study the open L-shell spectra of NLTE plasmas of mid-Z materials. Studies have been done using a 250 μm diameter dot composed of a layer of 1200 Å thick Zn between two 600 Å thick layers of Ti, in the center of a 1000 μm diameter, 13 μm thick beryllium tamper. Lasers heat the target from both sides for up to 3 ns. The size of the emitting volume vs time was measured with x-ray imaging (face-on and side-on) to determine the density. The temperature was measured from the Ti K-shell spectra. The use of this platform for the verification of atomic L-shell models is discussed.},
doi = {10.1063/1.5039357},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {8}
}

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