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Abstract

First and second harmonic electron cyclotron current drive (ECCD) has been studied worldwide for many years: it has proven difficult to measure the true EC current drive. Initial ECCD experiments on TCV have concentrated on the influence of elliptical polarization on plasma performance and current drive efficiency. These experiments provide a check of the system performance as well as a reference experiment with small, close-to-circular, moderate-q(a) plasmas, before investigating shaped plasmas. Current and density are feedback-controlled and changes in surface loop voltage provide the main diagnostic for evidence of current drive. Power was provided by one gyrotron at the second harmonic (0.5 MW, 82.7 GHz, 0.6s, X2) of the cyclotron resonance.

Additional information

Authors: GOODMAN T P ET AL, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne Association EURATOM-Confédération Suisse (CH);RAZUMOVA K A, Russian Research Center Kurchatov, Moscow (RU)
Bibliographic Reference: Article: Second Europhysics Topical Conference on Radio Frequency Heating and Current Drive of Fusion Devices, Vol. 22A, pp. 245-248
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