Effect of nonlinear landau damping in plasma-based backward raman amplifier

N. A. Yampolsky, N. J. Fisch

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30 Scopus citations

Abstract

A plasma wave can mediate laser coupling in a plasma-based resonant backward Raman amplifier for high power amplification of short laser pulses. The resonant nature of amplification requires a long lifetime of the plasma wave. However, the plasma wave can be heavily Landau damped in warm plasma. On the other hand, Landau damping can be saturated in the presence of a strong plasma wave. We study backward Raman amplifier in the nonlinear regime of Landau damping using a simplified fluid model. We find the regime in which initially high linear Landau damping can be significantly saturated. Because of the saturation effect, higher temperatures can be tolerated in achieving efficient amplification. The plasma temperature can be as much as 50% larger compared to the case of unsaturated Landau damping.

Original languageEnglish (US)
Article number072105
JournalPhysics of Plasmas
Volume16
Issue number7
DOIs
StatePublished - Aug 12 2009

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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