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During pellet injection in the Tore Supra tokamak, a very fast electron temperature drop in the whole plasma column has been observed by means of a fast acquisition ECE Fabry-Perot interferometer system. The time delay of the temperature drop between plasma edge and centre is less than 20 micro-s, corresponding to a propagation velocity of the order of 25 km/s, much larger than both the pellet velocity and the ordinary diffusion velocity. A model of neutral atom diffusion, in which the charge-exchange process plays a key role, is proposed to explain such phenomena.

Additional information

Authors: LIU W D, University of Science and Technology of China, Department of Modern Physics, Hefei (CN);TALVARD M, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1489 EN (1993) 17 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
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