RUNAWAY AND WAVE INDUCED CURRENTS.
The present understanding (May 1983) of current drive by lower hybrid waves in Tokamak plasmas is reviewed with particular stress on the theory. First, the classical model of Fisch and its variants are discussed in light of recent experimental data. It is argued that these simple models do not account for most of the features of the results obtained. Next, effects of runaways on current generation are considered. It is shown that runaways, resulting from a residual ohmic electric field, may play an important role. Further, the mechanism of runaway- current sustainment, as proposed by Liu et al., is re-examined. It is shown that, for a realistic range of parameters, this mechanism does not allow a significant current to be sustained. Finally, some results of a recently developed numerical code, which include the evolving electron distribution function, ray tracing and transport, are briefly noted. It is concluded that one of the existing theories can be used to interpret satisfactorily all the experimental observations.
Bibliographic Reference: WRITE TO CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE, CH-1007 LAUSANNE (SWITZERLAND), MENTIONING REPORT LRP 22/83
Record Number: 1989122017400 / Last updated on: 1987-01-01
Available languages: en