A RENORMALIZED THERMAL DIFFUSIVITY FOR TOKAMAKS
Generalizing our earlier work on a fluid approach due to Kadomtsev and Pogutse we derive a nonlinear equation for the electron thermal diffusivity in a tokamak due to small-scale, high radial wave number magnetic field fluctuations. We show that this equation has a non-trivial solution leading to enhanced energy transport in a region of finite volume which includes the resonant points. The volume fraction of this region has been calculated explicitly in terms of the assumed magnetic fluctuation spectrum. The enhancement of transport is the result of a new non linear phase-shift mechanism which depends on the interaction of parallel and perpendicular thermal conduction. We compare and contrast the present results with our earlier work, and also with alternative approaches to anomalous transport.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON. OX14 3DB (UK), MENTIONING REPORT CLM-P 717, 1983
Record Number: 1989122085600 / Last updated on: 1987-01-01
Available languages: en