Journal
PHYSICS OF PLASMAS
Volume 16, Issue 7, Pages -Publisher
AIP Publishing
DOI: 10.1063/1.3160606
Keywords
plasma interactions; plasma temperature; plasma waves; plasma-beam interactions
Categories
Funding
- DOE [DEAC02-76CH03073]
- NNSA under the SSAA Program through DOE Research Grant [DE-FG5204NA00139, DE-FG52-08NA28553, DE-FG5207NA28122]
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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.
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