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Particle-in-cell simulations of stimulated Raman scattering in the kinetic regime for direct-drive inertial confinement fusion
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Spencer, S. J. (2021) Particle-in-cell simulations of stimulated Raman scattering in the kinetic regime for direct-drive inertial confinement fusion. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3756235
Abstract
Stimulated Raman scattering (SRS) is a parametric instability of concern to inertial confinement fusion (ICF) schemes; since it scatters light away from the target, and accelerates hot electrons towards the cold fuel. In directly-driven ICF schemes we are concerned with the convective growth of SRS; which can have very large gain in the ICF corona, leading to pump-depletion of the laser ahead of the quarter critical density surface, where it can grow as an absolute instability. Recent shock-ignition experiments [Cristoforetti et al., 2021; Scott et al., 2021], have measured large back-scatter from convective SRS originating from very low plasma densities, where its behaviour is dominated by kinetic effects.
In this thesis we use one-dimensional particle-in-cell simulations to explore convective SRS in three scenarios. First, we consider inflationary SRS (iSRS) in isolation from other coronal laser-plasma instabilities, and study the dependence of the iSRS threshold on the density scale length of the coronal plasma [Spencer et al., 2020]. In the second scenario we study how the inflationary SRS behaviour identified in Spencer et al. [2020] changes when driven by a broadband laser. We model realistic laser and plasma profiles for shockignition on Nd : glass and argon fluoride laser systems. The third investigation concerns convective SRS, in both the kinetic and fluid regimes, for magnetised plasmas where it competes with other one-dimensional laser-plasma instabilities such as stimulated Brillouin scattering.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics | ||||
Library of Congress Subject Headings (LCSH): | Raman effect, Inertial confinement fusion, Laser plasmas, Hot carriers, Plasma instabilities | ||||
Official Date: | September 2021 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Arber, T. D. ; Bennett, K. H. (Keith H.), 1947- | ||||
Format of File: | |||||
Extent: | xv, 118 leaves : illustrations | ||||
Language: | eng |
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