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The TCV tokamak is a medium size device which has been designed for operation at high elongation (up to 3) and plasma currents up to 1 MA.
The Thomson scattering system is the main diagnostic to provide information on the spatial and temporal evolution of Te and Ne throughout the duration of a discharge (up to 2 S). It is based on a repetitively pulsed Nd:YAG laser operated at 20 Hz. Measurements are made along a vertical chord close to the centre of the vacuum vessel (R=0.9 m) using horizontal observation ports on 3 levels. In its final state the system will be capable of covering the vertical extent of fully elongated plasmas (Kappa=3), however, at present only 10 spatial channels have been implemented. An upgrade to 25 channels is in preparation.

Additional information

Authors: BEHN R ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 7th International Symposium on Laser-aided Plasma Diagnostics (1996)
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