Cross-field plasma acceleration and potential formation induced by electromagnetic waves in a magnetized plasma

摘要

A single-particle theory is developed to investigate particle acceleration along and across a magnetic field and the generation of an electric field transverse to the magnetic field induced by electromagnetic waves in a magnetized plasma. The almost perpendicularly propagating waves accelerate particles via their Landau and cyclotron damping, and the ratio of parallel and perpendicular drift velocities v_(s‖)/v_d can be proved to be proportional to k_‖/k_⊥. Simultaneously, an intense crossfield electric field E_0 = B_0 * v_d/c is generated via the dynamo effect owing to perpendicular particle acceleration to satisfy the generalized Ohm's law. This means that this cross-field particle drift in a collisionless plasma is identical to E * B drift. It is verified that the transport equations obtained are exactly equivalent to those derived from the θ-dependent quasilinear velocity-space diffusion equation obtained from the Vlasov-Maxwell equations.