Enhanced scattering in magnetized laser-produced plasma

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Abstract
A simple model of Bernstein mode parametric excitation near the electron plasma frequency in a subcritical laser-produced plasma is presented. It is argued that the instability threshold of such modes might become much lower than the usual thresholds for both convective and absolute Raman scattering, in particular, near the so-called “ωqn” resonances. This would occur in high-temperature plasmas (2–5 keV) and over very small (about ten microns long) regions of flat magnetic field and plasma density, corresponding to hot spot locations. A special emphasis is placed on a simplified formulation of the growth rates and thresholds for parameters domains wherein Bernstein mode parametric excitation might be of importance, to allow applications in any experimental situation. Many features of the resulting backscatter compare favorably with experimental observations.