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The response of the ASDEX plasma to Alfvén wave heating (AWH) is studied. Antenna excitation was provided by the TCA rf generator with output power capability of 500 kW, using only a single element on the low field side. The most important plasma effect seen during the Alfvén pulse was an uncontrolled density rise. This was not due to impurities, nor to a change in recycling. In general the effect of rf on the plasma was largest at lowest density, but no significant difference was detected between the effects of gas puffing and of AWH. Experiments with AWH applied during a long 1MW NBI pulse produced no observable effects beyond those of NBI. The density rise observed with AWH into ohmic discharges was absent, although the coupling was perhaps reduced by changes in the edge profiles during NBI.

Additional information

Authors: BESSON G ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);BRAUN F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Paper presented: 17th EPS Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35299 ORA
Record Number: 199011645 / Last updated on: 1994-12-02
Original language: en
Available languages: en