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Microwave transmission spectra measured on the Tore Supra tokamak exhibit systematic enhancement of the transmitted power at frequencies close to the electron gyrofrequency, often well beyond the corresponding level detected in vacuum. In order to explain such observations, the problem of electromagnetic wave propagation near the electron cyclotron frequency in a hot magnetised plasma is investigated in the framework of geometrical optics. The simple case of the ordinary mode injected vertically is studied by taking the finite plasma temperature and relativistic corrections to the dispersion relation into account. It is found that the ray trajectories are strongly affected in the anomalous dispersion region close to the cyclotron resonance. The local enhancement of the transmitted power observed experimentally can be explained as a focusing phenomenon related to hot plasma corrections to the wave refractive index.

Additional information

Authors: VÉZARD D, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);LAURENT L, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);SÉGUI L, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);GIRUZZI G, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Physics of Plasmas, Vol. 2 (1995) No. 3, pp. 876-882
Record Number: 199510819 / Last updated on: 1995-07-17
Original language: en
Available languages: en
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