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

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.

doi:10.1063/1.5012523

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

Journal Article · Fri Mar 02 00:00:00 EST 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5012523· OSTI ID:1548344

^[1];

^[2]; Brown, K. C. ^[3]; Davis, J. F. ^[4]; Kemp, G. E. ^[1]; Koga, K. ^[5]; Tanaka, N. ^[5]; Yogo, A. ^[5];

^[6]; Nishimura, H. ^[5];

^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Osaka Univ. (Japan); Tohoku Univ., Sendai (Japan)
U. S. Air Force Academy, Colorado Springs, CO (United States)
Alme and Associates, DTRA, Fort Belvoir, VA (United States)
Osaka Univ. (Japan)
Osaka Univ. (Japan); Chinese Academy of Sciences (CAS), Beijing (China)

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)].

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344; AC5207NA27344; 17-ERD-027

OSTI ID:: 1548344

Alternate ID(s):: OSTI ID: 1423510

Report Number(s):: LLNL-JRNL-740992; 895308

Journal Information:: Physics of Plasmas, Vol. 25, Issue 3; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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References (17)

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Cited By (1)

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