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Abstract

A sophisticated system of electron cyclotron diagnostics is available on Tore Supra, including Michelson interferometers measuring the full spectrum of the first three harmonics, twelve Fabry-Perot interferometers viewing the plasma along several poloidal chords, and microwave transmission on a vertical chord using the ordinary mode in the electron-cyclotron frequency range (77-109 GHz). This set of diagnostics is used to investigate the dynamical behaviour of strongly anisotropic fast electron distributions generated during lower hybrid current drive. The transmission diagnostics and the Fabry-Perot interferometers are well suited to study the relaxation of the fast electron tail, which takes place on a time scale of a few ms. This has allowed the first experimental measurement of both collisional time constants, related to slowing-down and pitch-angle scattering, respectively. The interpretation is corroborated by extensive 3-D Fokker-Planck simulations.

Additional information

Authors: GIRUZZI G, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);MICHELOT Y, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);SÉGUI J L, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);TALVARD M, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR);SEGUI J L, CEA, Departement de Recherches sur la Fusion Controlee, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Paper presented: 9th Workshop on Electron Cyclotron Waves, San Diego (US), January 22-26, 1995
Availability: Available from (1) as Paper EN 38836 ORA
Record Number: 199510210 / Last updated on: 1995-02-21
Category: PUBLICATION
Original language: en
Available languages: en