MAGNETOHYDRODYNAMIC EQUILIBRIA OF A CYLINDRICAL PLASMA WITH POLOIDAL MASS-FLOW AND ARBITRARY CROSS-SECTIONAL SHAPE

The equilibrium of a cylindrical plasma with purely poloidal mass Bow and cross section of arbitrary shape is investigated within the framew ork of the ideal MHD theory. For the system under consideration it is shown that only incompressible Bows are possible and, consequently, th e general two-dimensional flow equilibrium equations reduce to a singl e second-order quasilinear partial differential equation for the poloi dal magnetic flux function psi, in which four profile functionals of p si appear. Apart from a singularity occurring when the modulus of Mach number associated with the Alfven velocity for the poloidal magnetic field is unity, this equation is always elliptic and permits the const ruction of several classes of analytic solutions. Specific exact equil ibria for a plasma confined within a perfectly conducting circular cyl indrical boundary and having (i) a flat current density and (ii) a pea ked current density are obtained and studied.