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Abstract

The Thomson scattering system installed on the TCV tokamak is based on a repetitively pulsed Nd-YAG laser permitting measurements at a sampling rate of 20 Hz. Spatial profiles of Te and Ne are measured with a resolution of 30-40 mm along the laser beam which intersects the plasma in a vertical direction at a radial position close to the magnetic axis. Collection optics have been installed on 3 horizontal ports giving full access for observation of highly elongated plasmas. The scattering volumes are imaged onto fibre bundles which transmit the radiation to sets of polychromators for spectral analysis. Raman calibration of the system using nitrogen gas has shown that stray light is negligible and has confirmed that the sensitivity of N(e) measurements is 3E18 m{-3}. Comparison of line integrated Ne data with those obtained from an FIR interferometer show good agreement.

Additional information

Authors: BEHN R, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);FRANKE S, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);PIETRZYK Z A, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);HOFMANN F, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);NIESWAND C, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 7th International Toki Conference on Plasma Physics and Controlled Nuclear Fusion (1995)
Record Number: 199610087 / Last updated on: 1996-02-16
Category: PUBLICATION
Original language: en
Available languages: en