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Title: Absolute stimulated Raman side scatter in direct-drive laser-produced plasmas

Abstract

Production of suprathermal electrons by stimulated Raman scattering (SRS) is a principal concern for contemporary direct-drive inertial confinement fusion experiments at the National Ignition Facility and similar systems since such electrons penetrate and preheat the target core, preventing efficient implosion. The higher temperatures and longer scale lengths in these experiments favor SRS over two-plasmon decay, which predominated in earlier experiments. In particular, current experiments are expected to exceed the threshold for absolute Raman side scatter, which would then dominate the interaction since it grows temporally until saturated by nonlinear mechanisms such as hot-electron production. Until recently, analyses of SRS side scatter have treated the case of a single laser beam incident on a plasma, but the direct-drive approach to laser fusion employs a multitude of beams to drive the implosion. Here in this paper, we present an analysis that can be applied to an arbitrary number of beams with varied angles of incidence and polarizations. In the case of a single beam, it allows a physically motivated derivation and verification of an analytic threshold formula. In the general case of multiple beams and arbitrary orientation and polarizations, the threshold is found by numerical integration of a set of first-order linearmore » partial differential equations.« less

Authors:
 [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1608640
Alternate Identifier(s):
OSTI ID: 1607948
Report Number(s):
2018-324; 1555
Journal ID: ISSN 1070-664X; 2018-324, 1555, 2511
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 4; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Short, R. W. Absolute stimulated Raman side scatter in direct-drive laser-produced plasmas. United States: N. p., 2020. Web. doi:10.1063/1.5131158.
Short, R. W. Absolute stimulated Raman side scatter in direct-drive laser-produced plasmas. United States. doi:https://doi.org/10.1063/1.5131158
Short, R. W. Wed . "Absolute stimulated Raman side scatter in direct-drive laser-produced plasmas". United States. doi:https://doi.org/10.1063/1.5131158. https://www.osti.gov/servlets/purl/1608640.
@article{osti_1608640,
title = {Absolute stimulated Raman side scatter in direct-drive laser-produced plasmas},
author = {Short, R. W.},
abstractNote = {Production of suprathermal electrons by stimulated Raman scattering (SRS) is a principal concern for contemporary direct-drive inertial confinement fusion experiments at the National Ignition Facility and similar systems since such electrons penetrate and preheat the target core, preventing efficient implosion. The higher temperatures and longer scale lengths in these experiments favor SRS over two-plasmon decay, which predominated in earlier experiments. In particular, current experiments are expected to exceed the threshold for absolute Raman side scatter, which would then dominate the interaction since it grows temporally until saturated by nonlinear mechanisms such as hot-electron production. Until recently, analyses of SRS side scatter have treated the case of a single laser beam incident on a plasma, but the direct-drive approach to laser fusion employs a multitude of beams to drive the implosion. Here in this paper, we present an analysis that can be applied to an arbitrary number of beams with varied angles of incidence and polarizations. In the case of a single beam, it allows a physically motivated derivation and verification of an analytic threshold formula. In the general case of multiple beams and arbitrary orientation and polarizations, the threshold is found by numerical integration of a set of first-order linear partial differential equations.},
doi = {10.1063/1.5131158},
journal = {Physics of Plasmas},
number = 4,
volume = 27,
place = {United States},
year = {2020},
month = {4}
}

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