Cylindrical Plasma Model Research Articles

The effect of HF field on diffusion and convection in a plasma column

A cylindrical plasma model with both axial and azimuthal steady magnetic field is used. Nonlinear excitation of time averaged electric currents by the HF field is analyzed. Ponderomotive forces of the HF field also lead to translational and rotational plasma motions. Radial plasma diffusion can be modified by the presence of the HF field at sufficiently low frequencies. The analysis can be applied to problems of anomalous transport.

The influence of finite Larmor radius upon the resistive tearing mode in the low-beta, compressible limit

A cylindrical plasma model is discussed in the low magnetic shear limit where FLR effects are relevant. Two regimes of the drift frequency are found. When FLR effects are large, they dominate finite-beta phenomena, producing cut-off of the main tearing mode independent of plasma pressure gradient. With small FLR, a smooth transition to the zero Larmor radius approximation is discussed. In both regimes, overstable modes with small growth rate and frequency characterized by the ion drift frequency are found, but the theory is less reliable in these cases.