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Title: Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas

Abstract

We present the first experimental measurement of temperature and density of a warm dense plasma produced by a pulsed power driver at the Nevada Terawatt Facility (NTF). In the early phases of discharge, most of the mass remains in the core, and it has been challenging to diagnose with traditional methods, e.g. optical probing, because of the high density and low temperature. Accurate knowledge of the transport coefficients as well as the thermodynamic state of the plasma is important to precisely test or develop theoretical models. Here, we have used spectrally resolved non-collective X-ray Thomson scattering to characterize the dense core region. We used a graphite load driven by the Zebra current generator (0.6 MA in 200 ns rise time) and the Ti He-α line produced by irradiating a Ti target with the Leopard laser (30 J, 0.8 ns) as an X-ray probing source. Using this configuration, we obtained a signal-to-noise ratio ~2.5 for the scattered signal. Finally, by fitting the experimental data with predicted spectra, we measured T = 2±1.9 eV, ρ = 0.6±0.5 gr/cc, 70 ns into the current pulse. The complexity of the dense core is revealed by the electrons in the dense core that are foundmore » to be degenerate and weakly coupled, while the ions remain highly coupled.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [2];  [3];  [4];  [4];  [5];  [5];  [1]
  1. Univ. of California, San Diego, CA (United States). Center for Energy Research
  2. Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of Oxford (United Kingdom). Dept. of Physics
  5. Univ. of Nevada, Reno, NV (United States). Nevada Terawatt Facility, Dept. of Physics
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1466942
Report Number(s):
LLNL-JRNL-755378
Journal ID: ISSN 2045-2322; 942273
Grant/Contract Number:  
AC52-07NA27344; NA0001995; LFR-17-449059; EP/M022331; EP/N014472/1
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Valenzuela, J. C., Krauland, C., Mariscal, D., Krasheninnikov, I., Niemann, C., Ma, T., Mabey, P., Gregori, G., Wiewior, P., Covington, A. M., and Beg, F. N. Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas. United States: N. p., 2018. Web. doi:10.1038/s41598-018-26608-w.
Valenzuela, J. C., Krauland, C., Mariscal, D., Krasheninnikov, I., Niemann, C., Ma, T., Mabey, P., Gregori, G., Wiewior, P., Covington, A. M., & Beg, F. N. Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas. United States. doi:10.1038/s41598-018-26608-w.
Valenzuela, J. C., Krauland, C., Mariscal, D., Krasheninnikov, I., Niemann, C., Ma, T., Mabey, P., Gregori, G., Wiewior, P., Covington, A. M., and Beg, F. N. Wed . "Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas". United States. doi:10.1038/s41598-018-26608-w. https://www.osti.gov/servlets/purl/1466942.
@article{osti_1466942,
title = {Measurement of temperature and density using non-collective X-ray Thomson scattering in pulsed power produced warm dense plasmas},
author = {Valenzuela, J. C. and Krauland, C. and Mariscal, D. and Krasheninnikov, I. and Niemann, C. and Ma, T. and Mabey, P. and Gregori, G. and Wiewior, P. and Covington, A. M. and Beg, F. N.},
abstractNote = {We present the first experimental measurement of temperature and density of a warm dense plasma produced by a pulsed power driver at the Nevada Terawatt Facility (NTF). In the early phases of discharge, most of the mass remains in the core, and it has been challenging to diagnose with traditional methods, e.g. optical probing, because of the high density and low temperature. Accurate knowledge of the transport coefficients as well as the thermodynamic state of the plasma is important to precisely test or develop theoretical models. Here, we have used spectrally resolved non-collective X-ray Thomson scattering to characterize the dense core region. We used a graphite load driven by the Zebra current generator (0.6 MA in 200 ns rise time) and the Ti He-α line produced by irradiating a Ti target with the Leopard laser (30 J, 0.8 ns) as an X-ray probing source. Using this configuration, we obtained a signal-to-noise ratio ~2.5 for the scattered signal. Finally, by fitting the experimental data with predicted spectra, we measured T = 2±1.9 eV, ρ = 0.6±0.5 gr/cc, 70 ns into the current pulse. The complexity of the dense core is revealed by the electrons in the dense core that are found to be degenerate and weakly coupled, while the ions remain highly coupled.},
doi = {10.1038/s41598-018-26608-w},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {2018},
month = {5}
}

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