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Abstract

Thomson scattering is a well-known method to measure accurately the local electron temperature T(e) and density N(e) in tokamaks. Such a system has recently been installed in a basic version on the TCV tokamak, comprising one repetitively pulsed Nd:YAG laser at 20 Hz and 10 observation points along a vertical chord. So far it is possible to follow the temporal evolution of T(e) and N(e) during tokamak discharges and give an estimation of Z(eff) on the basis of the measurements with a temporal resolution of 50 ms. The results show the capabilities of the system, but also its present limitations due to the restriction to only 10 observation points. The main features of a future upgrade version are discussed.

Additional information

Authors: BEHN R, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);PIETRZYK Z A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);FRANKE S, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings : Herbsttagung 1994, Bulletin SPG/SSP, Vol. 11 (1994) No. 2
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