Y. Demers

Abstract: As a result of experimental observations of localized heat flux on components magnetically connected to radiating waveguides in Tore Supra and in TdeV, the acceleration of electrons near lower hybrid (LH) antennas has been investigated A simple analytical model has been developed to compute the dynamics of the particles in the near field approximation Landau damping of the very high N|| (20 < N|| < 100) component of the launched spectrum on the thermal electrons of the scrape-off layer (SOL) is found to occur Simulation of a typical LH pulse in Tore Supra indicates that the electrons can be accelerated up to 2-3 keV Modelling of the interaction of this fast electron population with the edge plasma allows a calculation of the heat flux on plasma facing components that are magnetically connected to the antenna Model results and the results of experiments in Tore Supra and TdeV are compared The calculated heat fluxes are found to be fairly consistent when the variation of convective heat flux at the grill aperture is taken into account From this analysis, it is concluded that, for an LH power density of 25 MW/m2, the resulting heat flux along the field lines (35 MW/m2) is manageable for the components connected to the antenna, provided that good coupling can be maintained at a low density in front of the grill

TL;DR: In this article, the interaction of tokamak plasma edge electrons with the electric near field generated by a lower hybrid slow wave antenna is studied, and an area-preserving map is derived to study the electron dynamics.

TL;DR: In this paper, the physics basis of a simulation model for lower hybrid current drive (LHCD) is discussed, and the predictions of current density and loop voltage from ACCOME are then compared with experimental LHCD results.

TL;DR: In this article, an analysis of lower hybrid current drive experiments in high power regimes, where fast electrons (up to few keV) are generated in front of the lower hybrid grill, was carried out using a formulation of the dielectric tensor that incorporates the fast electron population (Thot≲5 keV).

TL;DR: In this article, the acceleration process described in this paper depends on mode overlap in the antenna electric field spectrum and on the presence of high-mode, resonant with the ambient ( eV) edge electrons.