ROLES OF ELECTRIC-FIELD ON TOROIDAL MAGNETIC CONFINEMENT

Theoretical research on the influence of electric field on toroidal ma gnetic confinement is surveyed. The static electric field is first des cribed. A physical picture of the radial electric field generation and its influence on confinement are shown. Neoclassical effects as well as the non-classical processes are discussed. Emphasis is made on the connection with improved confinement. Convective cells with a nonunifo rm potential on the magnetic surface are also discussed. The roles of the fluctuating electric field are then reviewed. Recent progress in a nomalous transport theory is addressed. Through these surveys, the imp act of experiments using the heavy ion beam probes on modern plasma ph ysics is illustrated.