Measurement of density fluctuations in the Tore Supra tokamak
An ALTAIR device (Localised Infra-Red Analysis of Abnormal Transport) was implanted in the Tore Supra tokamak. It makes use of the diffusion of a CO(2) laser beam to measure microfluctuations of the plasma. An original feature of the device is that the direction of the analysis vector can be varied within a plane parallel to the equatorial plane of the torus, thus enabling the direction and the location of the density fluctuations to be determined. These are presumed to be propagated perpendicular to the magnetic field, with a high degree of precision. The results show that, depending on which angle of orientation and which analysis vector are chosen, the signal can come from the top, the centre or the bottom of the torus (when the analysis beam passes through the centre of the plasma). The signal detected for a given wave number is subsequently compared to measurements obtained for different orientation angles. The experimental results agree well with the model, confirming hypotheses put forward, especially those relating to the direction of propagation of the fluctuations.
Bibliographic Reference: Paper presented: 2ème Congrès de la Division de Plasma, Orsay (FR), Sept. 3-4, 1990
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Record Number: 199011502 / Last updated on: 1994-12-02
Original language: fr
Available languages: fr