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Title: Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios

Abstract

The properties of hot, dense plasmas generated by the irradiation of GaAs targets by the Titan laser at Lawrence Livermore National Laboratory were determined by the analysis of high resolution K shell spectra in the 9 keV to 11 keV range. The laser parameters, such as relatively long pulse duration and large focal spot, were chosen to produce a steady-state plasma with minimal edge gradients, and the time-integrated spectra were compared to non-LTE steady state spectrum simulations using the FLYCHK and NOMAD codes. The bulk plasma streaming velocity was measured from the energy shifts of the Ga He-like transitions and Li-like dielectronic satellites. The electron density and the electron energy distribution, both the thermal and the hot non-thermal components, were determined from the spectral line ratios. After accounting for the spectral line broadening contributions, the plasma turbulent motion was measured from the residual line widths. The ionization balance was determined from the ratios of the He-like through F-like spectral features. The detailed comparison of the experimental Ga spectrum and the spectrum simulated by the FLYCHK code indicates two significant discrepancies, the transition energy of a Li-like dielectronic satellite (designated t) and the calculated intensity of a He-like line (x), thatmore » should lead to improvements in the kinetics codes used to simulate the X-ray spectra from highly-charged ions.« less

Authors:
 [1];  [2];  [3];  [4];  [4];  [4];  [4];  [5];  [5];  [1]
  1. Artep Inc., Ellicott City, MD (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. General Atomics, San Diego, CA (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA)
OSTI Identifier:
1485819
Report Number(s):
SAND-2018-13086J
Journal ID: ISSN 1574-1818; 669969
Grant/Contract Number:  
AC04-94AL85000; NA0001840; DTRA-1-10-0077
Resource Type:
Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 26; Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; X-ray spectroscopy; Plasma diagnostics; Laser-produced plasmas; Hard X-ray spectra

Citation Formats

Seely, J. F., Fein, J., Manuel, M., Keiter, P., Drake, P., Kuranz, C., Belancourt, Patrick, Ralchenko, Yu., Hudson, L., and Feldman, U. Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios. United States: N. p., 2018. Web. doi:10.1016/j.hedp.2018.02.002.
Seely, J. F., Fein, J., Manuel, M., Keiter, P., Drake, P., Kuranz, C., Belancourt, Patrick, Ralchenko, Yu., Hudson, L., & Feldman, U. Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios. United States. doi:10.1016/j.hedp.2018.02.002.
Seely, J. F., Fein, J., Manuel, M., Keiter, P., Drake, P., Kuranz, C., Belancourt, Patrick, Ralchenko, Yu., Hudson, L., and Feldman, U. Sat . "Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios". United States. doi:10.1016/j.hedp.2018.02.002. https://www.osti.gov/servlets/purl/1485819.
@article{osti_1485819,
title = {Properties of laser-produced GaAs plasmas measured from highly resolved X-ray line shapes and ratios},
author = {Seely, J. F. and Fein, J. and Manuel, M. and Keiter, P. and Drake, P. and Kuranz, C. and Belancourt, Patrick and Ralchenko, Yu. and Hudson, L. and Feldman, U.},
abstractNote = {The properties of hot, dense plasmas generated by the irradiation of GaAs targets by the Titan laser at Lawrence Livermore National Laboratory were determined by the analysis of high resolution K shell spectra in the 9 keV to 11 keV range. The laser parameters, such as relatively long pulse duration and large focal spot, were chosen to produce a steady-state plasma with minimal edge gradients, and the time-integrated spectra were compared to non-LTE steady state spectrum simulations using the FLYCHK and NOMAD codes. The bulk plasma streaming velocity was measured from the energy shifts of the Ga He-like transitions and Li-like dielectronic satellites. The electron density and the electron energy distribution, both the thermal and the hot non-thermal components, were determined from the spectral line ratios. After accounting for the spectral line broadening contributions, the plasma turbulent motion was measured from the residual line widths. The ionization balance was determined from the ratios of the He-like through F-like spectral features. The detailed comparison of the experimental Ga spectrum and the spectrum simulated by the FLYCHK code indicates two significant discrepancies, the transition energy of a Li-like dielectronic satellite (designated t) and the calculated intensity of a He-like line (x), that should lead to improvements in the kinetics codes used to simulate the X-ray spectra from highly-charged ions.},
doi = {10.1016/j.hedp.2018.02.002},
journal = {High Energy Density Physics},
number = C,
volume = 26,
place = {United States},
year = {2018},
month = {2}
}

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