Abstract Details
Nonlinear Plasma Waves in SRS and Two Plasmon Decay
Author: Jay E Fahlen
Requested Type: Poster Only
Submitted: 2009-04-21 21:39:09
Co-authors: B.J. Winjum, T. Grismayer, F.S. Tsung, V.K. Decyk, W.B. Mori
Contact Info:
University of California, Los Angeles
405 Hilgard Ave
Los Angeles, CA 90095
United States
Abstract Text:
Stimulated Raman scattering (SRS) and the two-plasmon decay instability (2ωp) are laser-driven plasma instabilities found in inertial confinement fusion experiments. Both tend to reflect incident laser energy and generate hot electrons by coupling to finite-size electron plasma waves. Both instabilities have been studied in detail, but finite-size effects were typically ignored. This poster examines wave packets in 1D and 2D particle-in-cell simulations using the electromagnetic code Osiris and the electrostatic code BEPS. Focusing first on finite length effects, we show results of SRS and 2ωp simulations, but also simple yet detailed pure plasma wave simulations that allow a clear understanding of these finite effects. In 2D, we use the simulations to examine the localization of finite-width plasma waves and how it affects SRS’s recurrence. We also present results from simulations performed to study how finite numbers of particles can affect nonlinear Landau damping and frequency shifts.
Work supported by DOE under Grant Nos. DE-FG52-03-NA00065, DE-FG52-06NA26195, and DE-FG02-03ER54721.
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