Community Research and Development Information Service - CORDIS

A FIR laser scattering diagnostic on Tore Supra

A collective laser light scattering experiment using a carbon dioxide laser beam to measure plasma density fluctuations in the Tore Supra tokamak has been realised.

As the density fluctuations propagating in tokamaks have small wave numbers and require small scattering angles, such scattering experiments are considered to have no resolution along the beam. However, taking advantage of the pitch angle variation of the magnetic field lines around the magnetic axis along a vertical chord, it has been possible to obtain partial spatial localisation of the scattering volume by rotating the direction of the analysed wave vector in a horizontal plane. Heterodyne detection was used to determine the propagation direction of the fluctuations.

The experiment has been tested on acoustic waves, and the first results obtained on Tore Supra show the existence of a spatial resolution. It has been extensively used on Tore Supra since 1990 to analyse plasma fluctuations

Reported by

Commissariat à l'Energie Atomique (CEA)
Centre d'Études de Cadarache Sere-Ders
13108 Saint-Paul-lez-Durance
France
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