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Electron cyclotron wave absorption and emission by mildly relativistic electrons is investigated. The linear theory is developed for a small fraction of fast electrons, in order to determine the dynamics of such particles by using transmission measurements in tokamaks. Simple expressions for the dielectric tensor in the presence of a superthermal electron parallel-momentum distribution are obtained by taking the perpendicular energy of this population into account. It is shown that electron cyclotron wave absorption is weakly modified by the shape of the perpendicular-momentum distribution. On the other hand, wave attenuation at the fundamental resonance is significantly affected by the average perpendicular energy. A new diagnostic method is proposed to measure the perpendicular electron temperature and the parallel-momentum distribution simultaneously, by using the ordinary and extraordinary modes of polarisation.

Additional information

Authors: VEZARD D, CEA, Département de Recherches sur la Fusion Contrôlée, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1514 EN (1994) 22 pp.
Availability: Available from CEA, Département de Recherches sur la Fusion Contrôlée, Saint-Paul-lez-Durance (FR)
Record Number: 199410929 / Last updated on: 1994-11-28
Original language: en
Available languages: en