Laser-plasma instabilities in long scale-length plasmas relevant to shock-ignition

Seaton, A. G.; Arber, T. D.

doi:10.1063/5.0010920

Title: Laser-plasma instabilities in long scale-length plasmas relevant to shock-ignition

Journal Article · Thu Aug 06 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0010920· OSTI ID:1659216

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Univ. of Warwick (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Warwick (United Kingdom)

We present 2D particle-in-cell simulations of laser-plasma instabilities (LPI) performed using conditions relevant to experiments on the OMEGA and NIF laser facilities. The laser intensity used is 2×10¹⁵ W cm^-2, which allows comparison with previous experiments and simulations investigating shock ignition, though this is a relatively low intensity for the scheme. We find that the large convective gain of the instabilities leads to dynamics that are largely controlled by pump depletion and to scattering or absorption by LPIs predominantly occurring away from the quarter-critical density. The two-plasmon decay (TPD) instability is dominant for OMEGA-type conditions and remains important at the NIF-scale. In both cases, most absorption from TPD occurs near its Landau cutoff density, and we examine its nonlinear dynamics in this region, focusing on the ion-acoustic waves responsible for saturation. For NIF-type conditions, stimulated Raman scattering (SRS) and stimulated Brillouin scattering divert significant fractions of laser energy, and we find that SRS backscatter can occur with high gain at low densities due to kinetic effects. An in-depth analysis of hot-electron production is performed to identify the main sources and their characteristic electron temperature. For both simulations presented, the overall hot-electron temperature lies between 30 and 35 keV. This is relatively low and will likely increase shock pressure; however, the distributions also contain a significant number of high-energy (E_k>100 keV) electrons that would likely cause unacceptable preheat. We, therefore, suggest some strategies that may be utilized to minimize this high-energy component. I. INTROD

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1659216

Report Number(s):: LA-UR-20-22463; TRN: US2203414

Journal Information:: Physics of Plasmas, Vol. 27, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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References (59)

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