Mitigation of stimulated Raman scattering in the kinetic regime by external magnetic fields

Winjum, B. J.; Tsung, F. S.; Mori, W. B.

doi:10.1103/physreve.98.043208

Title: Mitigation of stimulated Raman scattering in the kinetic regime by external magnetic fields

Journal Article · Mon Oct 29 00:00:00 EDT 2018 · Physical Review E

DOI:https://doi.org/10.1103/physreve.98.043208· OSTI ID:1614554

Winjum, B. J. ^[1]; Tsung, F. S. ^[1]; Mori, W. B. ^[1]

Univ. of California, Los Angeles, CA (United States)

Here, we show via particle-in-cell simulations that small normalized magnetic fields (ω_c/ω_p << 1) can significantly modify the evolution of backward stimulated Raman scattering (SRS) in the kinetic regime due to the enhanced dissipation of nonlinear electron plasma waves propagating perpendicular to magnetic fields. A magnetic field applied perpendicularly to the electron plasma wave (and driving light wave) increases the SRS threshold for kinetic inflation and decreases the amount of reflectivity when SRS is driven significantly above threshold. Analysis indicates that this arises because trapped electrons are accelerated as they surf across the wave, leading to the continual dissipation of the electron plasma waves over a wider range of wave amplitudes. The reduction in SRS reflectivity is most significant for a purely perpendicular field, although reduction also occurs for other angles; a parallel field can slightly increase single-speckle SRS but decreases multispeckle SRS. These simulations demonstrate the significance of magnetic-field contributions to nonlinear electron plasma wave damping with respect to nonlinear parametric decay instabilities; the simulation parameters are directly relevant for SRS in inertial confinement fusion devices and indicate that approximately 30 tesla magnetic fields might significantly reduce SRS backscatter.

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Research Organization:: Univ. of California, Los Angeles, CA (United States)

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

Grant/Contract Number:: SC0019010; NA0002953

OSTI ID:: 1614554

Alternate ID(s):: OSTI ID: 1479615

Journal Information:: Physical Review E, Vol. 98, Issue 4; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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Cited By (4)

Interactions of laser speckles due to kinetic stimulated Raman scattering Winjum, B. J.; Tableman, A.; Tsung, F. S. Physics of Plasmas, Vol. 26, Issue 11 https://doi.org/10.1063/1.5110513	journal	November 2019
Petascale particle-in-cell simulations of kinetic effects in inertial fusion energy plasmas Wen, H.; Tsung, F. S.; Mori, W. B. Plasma Physics and Controlled Fusion, Vol. 61, Issue 4 https://doi.org/10.1088/1361-6587/ab019a	journal	March 2019
Suppression of parametric instabilities in inhomogeneous plasma with multi-frequency light Zhao, Yao; Weng, Suming; Sheng, Zhengming Plasma Physics and Controlled Fusion, Vol. 61, Issue 11 https://doi.org/10.1088/1361-6587/ab4691	journal	October 2019
Laser Amplification in Strongly-Magnetized Plasma Edwards, Matthew R.; Shi, Yuan; Mikhailova, Julia M. arXiv https://doi.org/10.48550/arxiv.1812.09429	text	January 2018

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Title: Mitigation of stimulated Raman scattering in the kinetic regime by external magnetic fields

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