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The fundamental phenomena governing the dynamics of anisotropic electron distributions in a tokamak plasma are investigated. A fast electron tail driven by modulated pulses of lower hybrid waves is analysed by a combination of three diagnostics: hard X-rays, electron cyclotron emissions, and transmission. Three different time constants, characterising radial diffusion, collisional friction, and pitch-angle scattering, respectively, are identified. Two distinct relaxation regimes are observed, related to the degree of anisotropy of the electron distribution.

Additional information

Authors: GIRUZZI G ET AL., CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Physical Review Letters, Vol. 74 (1995) No. 4, pp. 550-553
Record Number: 199510611 / Last updated on: 1995-06-06
Original language: en
Available languages: en