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Vlasov–Maxwell simulations of backward Raman amplification of seed pulses in plasmas

Published online by Cambridge University Press:  31 August 2016

Magdi Shoucri  and
Bedros Afeyan
Magdi Shoucri*
Affiliation:
Institut de recherche d'Hydro-Québec (IREQ), Varennes, Québec J3X1S1, Canada
Bedros Afeyan
Affiliation:
Polymath Research Inc., Pleasanton, CA 94566, USA
*
Address correspondence and reprint requests to: M. Shoucri, Institut de recherche d'Hydro-Québec (IREQ), Varennes, Québec J3X1S1, Canada. E-mail: [email protected]
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Abstract

We study the problem of the amplification of an ultra-short seed pulse via stimulated Raman backscattering (SRB) from a long pump pulse (assumed to have an envelope with a constant amplitude), in an underdense plasma. The SRB interaction couples the pump light wave to a daughter light seed wave propagating in the opposite direction, scattered off an electron plasma wave. In recent numerical simulations, it has been observed that besides stimulated Raman backward scattering (SRBS) and stimulated Raman forward scattering, other high-frequency kinetic instabilities can occur when modified distribution functions exist during the evolution of the system. In particular, we showed the prominent role played by kinetic electrostatic electron nonlinear (KEEN) waves (Afeyan et al., 2004). We continue this work by applying a relativistic Vlasov–Maxwell code to study stimulated KEEN wave scattering (SKEENS) and its role in the SRBS short pulse amplification processes. An analysis of the full spectrum of waves participating in the amplification processes is presented. The absence of spurious noise in grid-based Vlasov codes allows us to follow the evolution of the system with a kinetic (collisionless) description. This affords us a glimpse at the intricate phase-space structures such as trapped particle orbits, which coexist and interact nonlinearly in the electron distribution function.

Keywords

Laser–plasma instabilitiesRaman backward amplificationStimulated KEEN wave scatteringStimulated Raman ScatteringTrapped particle distribution functions
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 4 , December 2016 , pp. 576 - 600
Copyright
Copyright © Cambridge University Press 2016 

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