Inflationary stimulated Raman scattering in shock-ignition plasmas
Abstract
In the shock-ignition inertial confinement fusion scheme, high-intensity lasers propagate through an inhomogeneous coronal plasma, driving a shock designed to cause fuel ignition. During the high-intensity ignitor laser pulse, in the long scale length coronal plasma, back-scattered stimulated Raman scattering (SRS) is likely to be in the kinetic regime. In this work, we use one-dimensional particle-in-cell simulations to show that there is a non-linear frequency shift caused by kinetic effects, resulting in the growth of SRS in an inhomogeneous plasma far exceeding the predictions of fluid theory, the so-called inflationary SRS or iSRS. We find that iSRS occurs over a wide range of density scale lengths relevant to shock-ignition and other directly-driven inertial confinement fusion schemes. The presence of iSRS in shock-ignition plasmas has implications for the theoretical gains from shock-ignition inertial confinement fusion. Here, we quantify the intensity threshold for the onset of iSRS for shock-ignition relevant parameters.
- Authors:
-
[1];
[2];
[1]
- Univ. of Warwick, Coventry (United Kingdom)
- Univ. of Warwick, Coventry (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); Engineering and Physical Sciences Research Council (EPSRC)
- OSTI Identifier:
- 1760606
- Report Number(s):
- LA-UR-20-25473
Journal ID: ISSN 1070-664X; TRN: US2205761
- Grant/Contract Number:
- 89233218CNA000001; EP/G054950/1; EP/G056803/1; EP/G055165/1; EP/ M022463/1; EP/P02212X/1; EP/P020232/1
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 27; Journal Issue: 12; 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
Spencer, S. J., Seaton, Alexander George, Goffrey, Thomas, and Arber, Tony D. Inflationary stimulated Raman scattering in shock-ignition plasmas. United States: N. p., 2020.
Web. doi:10.1063/5.0022901.
Spencer, S. J., Seaton, Alexander George, Goffrey, Thomas, & Arber, Tony D. Inflationary stimulated Raman scattering in shock-ignition plasmas. United States. https://doi.org/10.1063/5.0022901
Spencer, S. J., Seaton, Alexander George, Goffrey, Thomas, and Arber, Tony D. Mon .
"Inflationary stimulated Raman scattering in shock-ignition plasmas". United States. https://doi.org/10.1063/5.0022901. https://www.osti.gov/servlets/purl/1760606.
@article{osti_1760606,
title = {Inflationary stimulated Raman scattering in shock-ignition plasmas},
author = {Spencer, S. J. and Seaton, Alexander George and Goffrey, Thomas and Arber, Tony D.},
abstractNote = {In the shock-ignition inertial confinement fusion scheme, high-intensity lasers propagate through an inhomogeneous coronal plasma, driving a shock designed to cause fuel ignition. During the high-intensity ignitor laser pulse, in the long scale length coronal plasma, back-scattered stimulated Raman scattering (SRS) is likely to be in the kinetic regime. In this work, we use one-dimensional particle-in-cell simulations to show that there is a non-linear frequency shift caused by kinetic effects, resulting in the growth of SRS in an inhomogeneous plasma far exceeding the predictions of fluid theory, the so-called inflationary SRS or iSRS. We find that iSRS occurs over a wide range of density scale lengths relevant to shock-ignition and other directly-driven inertial confinement fusion schemes. The presence of iSRS in shock-ignition plasmas has implications for the theoretical gains from shock-ignition inertial confinement fusion. Here, we quantify the intensity threshold for the onset of iSRS for shock-ignition relevant parameters.},
doi = {10.1063/5.0022901},
journal = {Physics of Plasmas},
number = 12,
volume = 27,
place = {United States},
year = {Mon Dec 21 00:00:00 EST 2020},
month = {Mon Dec 21 00:00:00 EST 2020}
}
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