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The excitation of longitudinal oscillations by an external h.f. field is investigated in a non-homogeneous magneto-active plasma. It is shown that when the frequency of the subharmonic of the external h.f. field approaches one of the plasma hybrid frequencies, the plasma develops a parametric-type resonance.

A 1-D relativistic Eulerian Vlasov code, with a fluid description of the plasma motion in the direction normal to the external magnetic field, is used to study the laser-plasma beat wave or backward Raman scattering current drive and heating. The code is validated by comparison with a fully kinetic 1-D 2/2 Vlasov code. Emphasis is placed on the dynamics of electrons in the low density region of phase space which generally is badly represented in the usual particle-in-cell methods. The low noise level of the Vlasov code allows precise measurements to be made of action transfer between photons, plasmons and electrons in Raman scattering processes. Results relevant to MTX- and ITER=like parameters are presented

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An analytical study of the reflection of an electrostatic wave propagating along a magnetized nonuniform plasma slab subject to an intense HF electric field is presented. It is found that when the frequency of the incident wave ωg is close to the electron plasma frequency ωPe, the plasma is less reflective due to the presence of the HF field. On the other hand, for a low-frequency incident wave (ωg ∼ ωPi), the reflection coefficient is directly proportional to the amplitude of the HF field.