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High power electromagnetic waves in the millimetre wavelength region can be used as an efficient and localized electron heating of Tokamak plasmas. The absorption takes place on a thin layer whose location depends on the harmonic of the local electron cyclotron frequency. Third harmonic extraordinary mode in the TCV Tokamak with top launch injection results as a compromise between heating of high density plasma (up to 1.2 x 10(E20) m(E-3) and the optimisation of single-pass absorption. The single-pass absorption in a top launch injection strongly depends on plasma refraction. In this launching configuration, the sensitivity of single-pass absorption on injection geometry is experimentally studied with an RF power as high as 500 kW. A comparison of the experimental results with a linear ray-tracing code will be presented.

Additional information

Authors: ARNOUX G ET AL, CRRP, Association EURATOM-Confederation Suisse, Lausanne (CH)
Bibliographic Reference: An oral report given at: Jahrestagung in Lausanne Organised by: Swiss Physical Society Held at: Lausanne (CH), 28 February to 1 March 2002
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