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Abstract

The time and space evolution of an RFP discharge is simulated by a onedimensional time dependent transport model. A good simulation of the magnetic field profiles and of the electron temperature on axis measured on the Eta-Beta II experiment is obtained with transport coefficients that are multiples of their classical expression. Their absolute value is sensitive to the variation of the discharge parameters. With the classical onedimensional MHD diffusion the magnetic field cannot be sustained for a time scale longer than about 100 msec. Hence a phenomenological dynamo term has been included in the magnetic field diffusion equations, to obtain quasi-stationary conditions for about 350 msec. This term leads to a dynamo electric field whose value is about -0.5 V/m on the plasma axis and +1 V/m at the wall, i.e. power is extracted from the inner region and supplied to the external region of the plasma; the total dissipated power is about twice the classical ohmic power.

Additional information

Authors: ORTOLANI S, CONSIGLIO NAZIONALE DELLE RICERCHE, PADOVA (ITALY);PUIATTI M E CONSIGLIO NAZIONALE DELLE RICERCHE, PADOVA (ITALY), CONSIGLIO NAZIONALE DELLE RICERCHE, PADOVA (ITALY)
Bibliographic Reference: COURSE ON MIRROR-BASED AND FIELD-REVERSED APPROACHES TO MAGNETIC FUSION, HELD AT VARENNA (ITALY), SEPT. 7-17, 1983 VOL. 2, PP. 161-189 VOL. 1: 388 P., VOL. 2: 324 P., 1984 WRITE TO MONTYPIA FRANCHI, ST. LUCIA - VIALE UMBRIA NO. 28, 06012 CITTA DI CASTELLO
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