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Effect of static magnetic field on stimulated Raman and Brillouin scattering

Stimulated Raman and Brillouin scatterings have been investigated in the presence of a magnetic field parallel to the direction of propagation of the pump electromagnetic wave. Fluid equations with phenomenological damping factors have been used for the evaluation of thresholds and growth rates. When both right and left circularly polarised pump modes are present the nonlinear interaction between the scattered circularly polarised waves introduces interesting modifications. Sharp increase in thresholds and similar behaviour in growth rates even for moderate magnetic fields is apparent. Effects due to the self action of the pump electromagnetic wave have been pointed out. Relevance to fusion studies has been discussed.