MINIMUM OHMIC DISSIPATION AND DC HELICITY INJECTION IN TOKAMAK-LIKE PLASMAS

The current and magnetic field profiles of a steady-state, tokamak-lik e plasma sustained by DC helicity injection are determined by assuming that the plasma relaxes to a state where the ohmic dissipation rate i s minimum, Helicity balance is imposed as a constraint and the basic f eatures required for DC helicity injection, a pair of electrodes magne tized by an externally produced flux, are included in a 2D model. The field is calculated self-consistently and only the values of experimen tally controllable parameters are used.