Abstract
Stimulated Raman scattering (SRS) with ordinary (O-mode) wave at phase space (x, v) is investigated. For this purpose Vlasov equation is solved with one simulation method. Evolution of distribution function for an early time and a later time is presented. Initial distribution function has Gaussian shape, that is important in plasma heating, but as the time passed, this function due to the perturbation extends over space and velocity. In this situation, the behavior of distribution function has an important role in instability rate. Then instability rate for SRS is obtained and these results are showed in some special times and special cells. Density fluctuations affect instability rate and there is no remarkable damping at early times. At later times instability rate reduces sensitively which is in accordance to electron plasma wave damping and then heating the electrons. Also with increase in frequency of the incident wave, the instability rate due to saturation decreases sensitively.
Highlights
There is increasing experimental evidence that parametric instabilities especially stimulated Raman scattering (SRS) play an important role in laser induced fusion and the radio frequency heating of magnetized plasmas [1,2,3,4,5,6].The need for auxiliary heating in tokamaks, in addition to the Ohmic heating result from the toroidal currents, has been recognized since the early days of tokamak research
Initial distribution function has Gaussian shape, that is important in plasma heating, but as the time passed, this function due to the perturbation extends over space and velocity
In this paper we present our simulation results on the Stimulated Raman scattering (SRS) with injection of an O-mode radio frequency wave with frequencies 28 and 58 GHz
Summary
There is increasing experimental evidence that parametric instabilities especially stimulated Raman scattering (SRS) play an important role in laser induced fusion and the radio frequency heating of magnetized plasmas [1,2,3,4,5,6]. An incident pump pulse is scattered by the electron density perturbation of a plasma wave in the stimulated Raman instability, while the plasma wave, in turn, arises from the decay of pump light wave. It is a resonant three-wave instability, which requires phase matching in both time and space that imposes frequency and wavenumber matching condition.
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