Stimulated Raman scattering in the presence of trapped particle instability

Mašek, M.; Rohlena, K.

doi:10.1016/j.cnsns.2007.04.011

Cited by 10 publications

(2 citation statements)

References 9 publications

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“…2(b), where shortly after the EPW amplitude saturation at pe t = 360 the fully developed structures of well trapped electrons are visible around the SRS-B EPW phase velocity for P = 5 × 10 16 W/cm 2 . The simulation was intentionally set to prevent a development of side modes connected with the trapped particle instability and thus an energy exchange between these modes was forbidden (compare 05013-p. 3 EPJ Web of Conferences [5]). We thus cannot observe a typical bursting behaviour of the instability caused by the interaction of these side modes with the trapped electrons.…”

Section: Results Of Numerical Simulationmentioning

confidence: 99%

Intensity dependence of electron gas kinetics in a laser corona

Mašek

Rohlena

2013

EPJ Web of Conferences

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Abstract. In various experimental situations relevant to the laser fusion, such as plasma near the light entrance holes of hohlraum in the indirect drive experiments or more recently in the shock ignition direct drive a relatively long underdense plasma of corona type is encountered, which is subject to an intense nanosecond laser beam. The plasma is only weakly collisional and thus in the electron phase space a complicated kinetic evolution is going on, which is taking the electron gas fairly far from the thermal equilibrium and contributes to its unstable behaviour. These phenomena impede the absorption and thermalization of the incoming laser energy, create groups of fast electrons and also may lead to a nonlinear reflection of the heating laser beam. One of the key processes leading to the electron acceleration is the stimulated Raman scattering (SRS) in its non-linear phase. The SRS in the presence of electronion collisions requires a certain threshold intensity above which the mentioned non-dissipative phenomena can occur and develop to the stage, where they may become unpleasant for the fusion experiments. To assess this intensity limit a computational model has been developed based on the Vlasov-Maxwell kinetics describing such a plasma in 1D geometry. At a relatively high intensity of 10 16 W/cm 2 a number of non-linear phenomena are predicted by the code such as a saturation of Landau damping, which is then translated in an unfavourable time dependence of the reflected light intensity and formation of accelerated electron groups due to the electron trapping. The purpose of the present contribution is to map the intensity dependence of this non-linear development with the aim of assessing its weight in fusion relevant situations.

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Section: Results Of Numerical Simulationmentioning

confidence: 99%

Intensity dependence of electron gas kinetics in a laser corona

Mašek

Rohlena

2013

EPJ Web of Conferences

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“…Mašek and Rohlena discussed the behavior of electron gas in a laser plasma corona in the presence of stimulated Raman scattering [12]; photodynamic damage (PDD) study using stimulated Raman scattering is made by AlSalhi et al [13]. Ackerhalt analyzed the theory mechanisms of stimulated Raman scattering and gave the steady state coupled-wave equations of the electric field amplitude of antiStokes light, pump light and Stokes light when the phase match exactly [14].…”

Section: Introductionmentioning

confidence: 99%