Highly Resolved Measurements of a Developing Strong Collisional Plasma Shock
- 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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- LLNL Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1438627
- Alternate ID(s):
- OSTI ID: 1423500; OSTI ID: 1466160
- Report Number(s):
- LLNL-JRNL-741313; LLNL-JRNL-755398; TRN: US1900472
- Journal Information:
- Physical Review Letters, Vol. 120, Issue 9; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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