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The ECH system on the tokamak TCV (Tokamak a Configuration Variable) has reached completion of the first of three stages of auxiliary heating installations with the operation of the first cluster of three 82.7 GHz gyrotrons each of 0.5 MW, 2.0 s pulse length second harmonic X-mode (X2). The overall ECRH project is to have 3.0 MW of X2 (six gyrotrons at 82.7 GHz) and 1.5 MW (three gyrotrons at 118 GHz, capable of 210 c pulse lengths but to be operated up to 2.0 s at CRPP) at the third harmonic X-mode (X3). During the past operational campaign a variety of experiments have been performed using the available ECH power of 1.5 MW. Some of these include commissioning of the launching antenna, studies of confinement as a function of plasma shape and assisted L to H-mode transitions. Also studies with non-zero toroidal launch angles have been performed, including scans of toroidal injection angle with co- and counter-ECCD, up-down asymmetry associated with an inherent off-axis ECCD component, and full inductive current replacement. This report will give a brief description of the X2 and X3 systems and relevant diagnostics on TCV in section 1, followed by a description of the experimental campaign. These results are divided into two groups: Section 2 will summarize the results of the ECH experiments (zero toroidal launch angle) and Section 3 will describe the ECCD experiments.

Additional information

Authors: HENDERSON M A ET AL, CRPP, Ecole Polytechnique Federale de Lausanne, Lausanne (CH);THE TCV TEAM, CRPP, Ecole Polytechnique Federale de Lausanne, Lausanne (CH);PEYSSON Y, CEA, Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral report given at: The Fourth International Workshop on Strong Microwaves in Plasma, Nizhny Novgorod (RU), 1-8 August 1999
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