Parametric dependence of two-plasmon decay in homogeneous plasma

The Multiple-Beam Two-Plasmon-Decay Instability

vii

Decay of homogeneous two-dimensional quantum turbulence

3/2omega0 radiation from the laser-driven two-plasmon decay instability in an inhomogeneous plasma.

We present the results of the first reduced model simulations of the nonlinear development of the two-plasmon decay instability in an inhomogeneous plasma, including properties of the 3/2 harmonic emission. A sharp increase in radiation and Langmuir turbulence fluctuation levels occurs above a threshold laser intensity that depends on initial fluctuation levels. We study the competition between...

Direct observation of the two-plasmon-decay common plasma wave using ultraviolet Thomson scattering.

A 263-nm Thomson-scattering beam was used to directly probe two-plasmon-decay (TPD) excited electron plasma waves (EPWs) driven by between two and five 351-nm beams on the OMEGA Laser System. The amplitude of these waves was nearly independent of the number of drive beams at constant overlapped intensity, showing that the observed EPWs are common to the multiple beams. In an experimental config...

On Novel Mechanism of a Pump Electromagnetic Wave Absolute Two- Plasmon Parametric Decay Instability Excitation in Tokamak ECRH Experiments

Novel mechanism leading to excitation of absolute two – upper hybrid – plasmon parametric decay instability (TPDI) of a pump extraordinary (X) wave is discussed. It is shown that the upper hybrid (UH) plasmon can be 3D trapped in the presence of both a non-monotonous density profile and a finite-size pump beam in a plane perpendicular to the plasma inhomogeneity direction. This leads to excitat...