LOWER HYBRID CURRENT DRIVE AND RECHARGING OF THE OHMIC HEATING TRANSFORMER IN ASDEX
The lower hybrid current drive experiments in ASDEX are performed in two different modes. In a first mode the current in the primary coil of the OH transformer is kept constant and the plasma current is allowed to change. At high powers and low densities the plasma current is ramped-up. In a second mode the plasma current is feedback controlled to a constant value, required a primary current rate of change which depends on the applied RF power. At high power and low densities this leads to a recharging of the OH transformer. The recharging efficiency shows a maximum as a function of density and saturates or even decreases with increasing RF power. The results are compared with a current drive theory including the effects of a low dc electric field.
Bibliographic Reference: COURSE AND WORKSHOP ON APPLICATIONS OF RF WAVES TO TOKAMAK PLASMAS, VILLA MONASTERO, VARENNA (ITALY), SEPT. 5-14, 1985 PP. 633-643, VOL. II 908 P., 1985, VOL. I AND VOL. II WRITE TO MONOTYPIA FRANCHI, VIALE UMBRIA 28/C, 06012 CITTA DI CASTELLO, PERUGIA (I
Record Number: 1989124100500 / Last updated on: 1987-01-01
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