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Abstract

Collective Thomson scattering from density fluctuations at the thermal level is used to measure the ion temperature of a tokamak plasma. The experiment installed at the TCA tokamak comprises a pulsed optically pumped D(2)O laser emitting at 385 microns and a heterodyne receiver with a Schottky barrier diode mixer. Measurements have been carried out in H, D, and He plasmas. At electron densities above 5 x 1.0 E19/m3 the signal-to-noise ratio is sufficient to obtain ion temperature measurements in a single laser shot with an estimated uncertainty of 20%. For the evaluation of the ion temperature from the spectrum of the scattered radiation, the contributions from impurity ions and the influence of the magnetic field are taken into account.

Additional information

Authors: BEHN R, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne, Lausanne (CH);SIEGRIST M R, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne, Lausanne (CH);SALITO S A, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne, 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: Fourth International Symposium on Laser-Aided Plasma Diagnostics, Fukuoka (JP), Nov. 20-23, 1989
Availability: Available from (1) as Paper EN 35566 ORA
Record Number: 199010679 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en
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