The authors consider the interaction of a plasma column in a constant magnetic field Hz with a system of two counter-rotating high-frequency magnetic fields whose axis of rotation is directed along a constant magnetic field. Both the first and the second wave are uniform along the axis of rotation. The configuration of the high-frequency field is such that the electrical component of the field is directed along the constant magnetic field, while the latter does not influence the effectiveness of the action of the high-frequency field on the plasma.It is assumed that the collision frequency ν of the charged particles in the plasma is non-zero. Taking into account entrainment of the plasma by the high-frequency field, one can use — instead of the second wave of the alternating field — the constant magnetic field of a multipole configuration, which behaves as a high-frequency field relative to the rotating plasma. The distribution of the plasma rotation velocity vφ, the charged particle concentrations N and the strength of the alternating fields φ, and r along the plasma column radius are determined by a system of Maxwellian equations and equations of motion for the ions and electrons. A system of equations with boundary conditions is solved by computer, and the radial dependences of the angular velocity of rotation, the plasma concentration and the high-frequency fields for different values of the multipole magnetic field and the plasma concentration are ascertained. If the ratio of the field strengths at the plasma boundary is of the order of unity, then the plasma column has a tubular structure.In the case of a rotating plasma, the radial distribution of the high-frequency field is of a peculiar type.
Interaction between a travelling electromagnetic fleld and a plasma