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Following experimental observations of localised heat flux on components magnetically connected to the radiating waveguides, the acceleration of electrons near lower hybrid (LH) antennas is investigated. A simple analytical model is developed to compute the dynamics of the particles in the near field approximation. It is found that Landau damping of the very high N(II) (20 < N(II) < 100) component of the launched spectrum on the thermal electrons of the scrape-off layers occurs. Simulation of a typical LH pulse on plasma indicates that the electrons can be accelerated up to 2-3 keV. The modelling of the interaction of this fast electron population with the edge plasma allows calculation of the heat flux on the connected components. For a LH power density of 25 MW/m{2}, the heat flux along the field lines (3.5 MW/m{2}) is easily manageable for the components connected to the antenna.

Additional information

Authors: GONICHE M ET AL, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);MAILLOUX J ET AL, Centre Canadian de Fusion Magnétique, Varennes (CA);HARRIS J H ET AL, Oak Ridge National Laboratory (US)
Bibliographic Reference: Report: EUR-CEA-FC-1598 EN (1997) 16pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
Record Number: 199710484 / Last updated on: 1997-05-09
Original language: en
Available languages: en