Physical Review Letters -- July 27, 1992
Volume 69, Issue 4, pp. 616-619

Fluctuation and Edge-Current Sustainment in a Reversed-Field Pinch

H. Ji, H.Toyama, A.Fujisawa, S.Shinohara and K.Miyamoto
Department of Physics, Faculty of Science, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Simple Ohm's law eta j_parallel = E_parallel is not satisfied in the a/2 <= r <= a region of the REPUTE-1 RFP plasma. Fluctuation-induced electric fields, such as , are not sufficient to account for eta j_parallel - E_parallel at the edge. Current-diffusion due to magnetic fluctuations, carried by fast electrons rather than bulk cold electrons, sustains the edge parallel equilibrium current.

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