PLASMA CURRENT SUSTAINMENT IN LOW-Q DISCHARGES BY LOWER HYBRID WAVES IN THE PETULA-B TOKAMAK
Plasma currents up to 200 kA have been sustained in the iron core transformer Petula-B tokamak by lower hybrid waves at 1.25 GHz. This proved to be feasible even at q(a) about 2. For a density delta n-e = 1. x 10**13 cm**-3, 100 kW of RF power is sufficient to drive 150 kAmps without the help of ohmic current. This efficiency has a 1/delta n-e dependence up to delta n-e approximately equal to 2x10**13 cm**-3. The RF current, as inferred from the loop voltage drop, versus power dependence shows a saturation which can be explained by strong magnetic coupling to the primary winding and by the inclusion of the plasma resistivity decrease during the RF current drive.
Bibliographic Reference: WRITE TO CEA MENTIONING REPORT EUR-CEA-FC 1218 EN 1984
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Record Number: 1989122096800 / Last updated on: 1987-01-01
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