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Abstract

Collective Thomson scattering has been developed as a method to measure the ion temperature T(i) of a tokamak plasma. Using a laser source in the far infrared, the system can evaluate T(i) in a single shot. In a first series of experiments a scattering geometry was chosen where the difference wave vector K was almost perpendicular to the vector of of the total magnetic field B. Under these conditions a strong enhancement of the scattered intensity towards the centre of the spectrum was observed in agreement with theoretical predictions. The combined effect of the magnetic field and the impurity ions made interpretation of the spectra difficult. A second series of experiments was performed in a He-plasma with the geometry changed to avoid an orientation of K perpendicular to B, to minimise the effect of uncertainties in Z(eff) and improve the precision of measurement of T(i).

Additional information

Authors: BEHN R, Centre de Recherche en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);SALITO S A, Centre de Recherche en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);SIEGRIST M R, Centre de Recherche en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);DICKEN D, Institut für Laser- und Plasmaphysik, Universität Düsseldorf (DE);HACKMANN J, Institut für Laser- und Plasmaphysik, Universität Düsseldorf (DE)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT) March 13-17, 1989
Availability: Available from (1) as Paper EN 34441 ORA
Record Number: 198910512 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
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