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Title: The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma

Abstract

This work was motivated by previous findings that the measured laser-driven heat front propagation velocity in under-dense TiO2/SiO2 foams is slower than the simulated one [Pérez et al., Phys. Plasmas 21, 023102 (2014)]. In attempting to test the hypothesis that these differences result from effects of the foam microstructure, we designed and conducted an experiment on the GEKKO laser using an x-ray streak camera to compare the heat front propagation velocity in “equivalent” gas and foam targets, that is, targets that have the same initial density, atomic weight, and average ionization state. In this article, we first discuss the design and the results of this comparison experiment. To supplement the x-ray streak camera data, we designed and conducted an experiment on the Trident laser using a new high-resolution, time-integrated, spatially resolved crystal spectrometer to image the Ti K-shell spectrum along the laser-propagation axis in an under-dense TiO2/SiO2 foam cylinder. We discuss the details of the design of this experiment, and present the measured Ti K-shell spectra compared to the spectra simulated with a detailed superconfiguration non-LTE atomic model for Ti incorporated into a 2D radiation hydrodynamic code. Finally, we show that there is indeed a microstructure effect on heat frontmore » propagation in under-dense foams, and that the measured heat front velocities in the TiO2/SiO2 foams are consistent with the analytical model of Gus'kov et al. [Phys. Plasmas 18, 103114 (2011)].« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3];  [4];  [1];  [5];  [5];  [5]; ORCiD logo [6];  [5]; ORCiD logo [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Osaka Univ. (Japan); Tohoku Univ., Sendai (Japan)
  3. U. S. Air Force Academy, Colorado Springs, CO (United States)
  4. Alme and Associates, DTRA, Fort Belvoir, VA (United States)
  5. Osaka Univ. (Japan)
  6. Osaka Univ. (Japan); Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1548344
Alternate Identifier(s):
OSTI ID: 1423510
Report Number(s):
LLNL-JRNL-740992
Journal ID: ISSN 1070-664X; 895308
Grant/Contract Number:  
AC52-07NA27344; AC5207NA27344; 17-ERD-027
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 3; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Colvin, J. D., Matsukuma, H., Brown, K. C., Davis, J. F., Kemp, G. E., Koga, K., Tanaka, N., Yogo, A., Zhang, Z., Nishimura, H., and Fournier, K. B. The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma. United States: N. p., 2018. Web. doi:10.1063/1.5012523.
Colvin, J. D., Matsukuma, H., Brown, K. C., Davis, J. F., Kemp, G. E., Koga, K., Tanaka, N., Yogo, A., Zhang, Z., Nishimura, H., & Fournier, K. B. The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma. United States. doi:10.1063/1.5012523.
Colvin, J. D., Matsukuma, H., Brown, K. C., Davis, J. F., Kemp, G. E., Koga, K., Tanaka, N., Yogo, A., Zhang, Z., Nishimura, H., and Fournier, K. B. Fri . "The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma". United States. doi:10.1063/1.5012523. https://www.osti.gov/servlets/purl/1548344.
@article{osti_1548344,
title = {The effects of microstructure on propagation of laser-driven radiative heat waves in under-dense high-Z plasma},
author = {Colvin, J. D. and Matsukuma, H. and Brown, K. C. and Davis, J. F. and Kemp, G. E. and Koga, K. and Tanaka, N. and Yogo, A. and Zhang, Z. and Nishimura, H. and Fournier, K. B.},
abstractNote = {This work was motivated by previous findings that the measured laser-driven heat front propagation velocity in under-dense TiO2/SiO2 foams is slower than the simulated one [Pérez et al., Phys. Plasmas 21, 023102 (2014)]. In attempting to test the hypothesis that these differences result from effects of the foam microstructure, we designed and conducted an experiment on the GEKKO laser using an x-ray streak camera to compare the heat front propagation velocity in “equivalent” gas and foam targets, that is, targets that have the same initial density, atomic weight, and average ionization state. In this article, we first discuss the design and the results of this comparison experiment. To supplement the x-ray streak camera data, we designed and conducted an experiment on the Trident laser using a new high-resolution, time-integrated, spatially resolved crystal spectrometer to image the Ti K-shell spectrum along the laser-propagation axis in an under-dense TiO2/SiO2 foam cylinder. We discuss the details of the design of this experiment, and present the measured Ti K-shell spectra compared to the spectra simulated with a detailed superconfiguration non-LTE atomic model for Ti incorporated into a 2D radiation hydrodynamic code. Finally, we show that there is indeed a microstructure effect on heat front propagation in under-dense foams, and that the measured heat front velocities in the TiO2/SiO2 foams are consistent with the analytical model of Gus'kov et al. [Phys. Plasmas 18, 103114 (2011)].},
doi = {10.1063/1.5012523},
journal = {Physics of Plasmas},
number = 3,
volume = 25,
place = {United States},
year = {2018},
month = {3}
}

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    Works referencing / citing this record:

    Laser propagation in a subcritical foam: Ion and electron heating
    journal, December 2018

    • Belyaev, M. A.; Berger, R. L.; Jones, O. S.
    • Physics of Plasmas, Vol. 25, Issue 12
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