Highly Resolved Measurements of a Developing Strong Collisional Plasma Shock

Rinderknecht, Hans G.; Park, H. -S.; Ross, J. S.; Amendt, P. A.; Higginson, D. P.; Wilks, S. C.; Haberberger, D.; Katz, J.; Froula, D. H.; Hoffman, N. M.; Kagan, G.; Keenan, B. D.; Vold, E. L.

doi:10.1103/PhysRevLett.120.095001

Title: Highly Resolved Measurements of a Developing Strong Collisional Plasma Shock

Journal Article · 01 March 2018 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.120.095001 · OSTI ID:1438627

Rinderknecht, Hans G. ^[1]; Park, H. -S. ^[1]; Ross, J. S. ^[1]; Amendt, P. A. ^[1]; Higginson, D. P. ^[1]; Wilks, S. C. ^[1]; Haberberger, D. ^[2]; Katz, J. ^[2]; Froula, D. H. ^[2]; Hoffman, N. M. ^[3]; Kagan, G. ^[3]; Keenan, B. D. ^[3]; Vold, E. L. ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this paper, the structure of a strong collisional shock front forming in a plasma is directly probed for the first time in laser-driven gas-jet experiments. Thomson scattering of a 526.5 nm probe beam was used to diagnose temperature and ion velocity distribution in a strong shock ($$M{\sim}11$$) propagating through a low-density ($${\rho}{\sim}0.01\text{ }\text{ }\mathrm{mg}/\mathrm{cc}$$) plasma composed of hydrogen. A forward-streaming population of ions traveling in excess of the shock velocity was observed to heat and slow down on an unmoving, unshocked population of cold protons, until ultimately the populations merge and begin to thermalize. Finally, instabilities are observed during the merging, indicating a uniquely plasma-phase process in shock front formation.

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

Sponsoring Organization:: USDOE; LLNL Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1438627

Report Number(s):: LLNL-JRNL--741313

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 120; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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