DYNAMO EFFECT AND CURRENT DRIVE BY LOW-FREQUENCY WAVES

The dynamo effect due to low-frequency oscillations and its applicatio n to the nonresonant current drive-are examined. The relevant single p article forces are analyzed and the possibility of the dynamo effect e nhancement by thermal effects is investigated. In the collisional two- fluid theory with isotropic pressure the flux-surface averaged paralle l dynamo field is found to be solely due to frictional forces. In the collisionless, double-adiabatic approximation the previously reported steady-state collisionless alpha-effect is shown to be absent. The ori gin of this discrepancy is discussed.