A Vlasov Code Simulation of the Amplification of Seed Pulses by Brillouin Backscattering in Plasmas

We use an Eulerian Vlasov code to study the problem of the amplification of seed pulses by Brillouin backscattering in the strong-coupling regime. In this process, there is an energy transfer, mediated by a resonant ion wave, from a long, high energy pump electromagnetic wave, to an initially counter-propagating ultra-short seed pulse. The code solves the onedimensional Vlasov-Maxwell set of equations, and has been previously used to study the problem of the plasma-based backward Raman amplification of seed pulses in underdense plasmas [1], and the problem of the Brillouin backscattering amplification of seed pulses in overdense plasma in the strong coupling regime [2]. In the example we present here, we use the parameters which have been used in [2], but we increase the plasma amplifier length from the value of 1000 / pe c  to 1600 / pe c  , which is the length used in the PIC