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Abstract

The ECH system on TCV has recently been upgraded to a total of 4.5 MW of installed power. In order to extend the density range of ECH heated plasmas up to electron densities of 1.2 1020 m-3, three 0.5 MW gyrotrons at a frequency of 118 GHz have been added to the existing 3MW 2nd harmonic system operating at a frequency of 82.7 GHz. The launcher consists in 1 mirror placed at the top of the vessel, which collects the power of the 3 microwave sources, and can be moved radially and poloidally to ensure maximum flexibility. The choice of the top-launch scheme results as a compromise between heating of high density plasmas and the maximisation of single-pass absorption in ohmically heated target plasmas. In this launching configuration, the sensitivity of single-pass absorption on launching geometry is experimentally studied and a comparison between the experimental results with a linear ray-tracing/absorption code is presented.

Additional information

Authors: HOGGE J-P, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse (CH);ALBERTI S, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse (CH);PORTE L, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse (CH);ARNOUX G, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Association EURATOM-Confédération Suisse (CH)
Bibliographic Reference: An oral report given at: 12th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating Organised by: Association Euratom-CEA, Cadarache Held at: Aix-en-Provence (FR) May 13-16, 2002
Availability: Workshop papers are available online at: http://wshop.free.fr/ec12/ This paper is also published in report LRP 726/02, available free of charge from: École Polytechnique Fédérale de Lausanne, Ecublens, CH-1015 Lausanne Fax +41-21-693474
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