Simulation of stimulated Brillouin scattering and stimulated Raman scattering in shock ignition

被引：20

作者：

Hao, L. ^{[1
,2
,4
]}

Li, J. ^{[1
,2
]}

Liu, W. D. ^{[1
,2
]}

Yan, R. ^{[1
,2
]}

Ren, C. ^{[1
,2
,3
]}

机构：

[1] Univ Rochester, Dept Mech Engn, Rochester, NY 14627 USA

[2] Univ Rochester, Laser Energet Lab, 250 E River Rd, Rochester, NY 14627 USA

[3] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[4] Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China

来源：

PHYSICS OF PLASMAS | 2016年 / 23卷 / 04期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

ION-ACOUSTIC-WAVES; PARAMETRIC-INSTABILITIES; PLASMA;

D O I：

10.1063/1.4945647

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We study stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) in shock ignition by comparing fluid and particle-in-cell (PIC) simulations. Under typical parameters for the OMEGA experiments [Theobald et al., Phys. Plasmas 19, 102706 (2012)], a series of 1D fluid simulations with laser intensities ranging between 2 x 10(15) and 2 x 10(16) W/cm(2) finds that SBS is the dominant instability, which increases significantly with the incident intensity. Strong pump depletion caused by SBS and SRS limits the transmitted intensity at the 0.17n(c) to be less than 3.5 x 10(15) W/cm(2). The PIC simulations show similar physics but with higher saturation levels for SBS and SRS convective modes and stronger pump depletion due to higher seed levels for the electromagnetic fields in PIC codes. Plasma flow profiles are found to be important in proper modeling of SBS and limiting its reflectivity in both the fluid and PIC simulations. (c) 2016 AIP Publishing LLC.

引用

页数：7

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