Selective Electron-Cyclotron Wave Absorption for Remote Control of the Current Density Profile in Tore Supra

摘要

Electron-cyclotron wave absorption by the current-carrying electron tail generated during lower-hybrid current drive in Tore Supra is investigated. The tail structure is determined by means of a 3-D bounce-averaged Fokker-Planck code and the electron-cyclotron wave power deposition is evaluated along the ray trajectories determined by a ray-tracing code. It is shown that efficient control of the power deposition both in real and in momentum space can be achieved by varying the launching angles. Wave emission and transmission at the harmonics of the electron gyrofrequency is also investigated. The potential of this diagnostic of the electron tail before and during electron-cyclotron heating of the lower-hybrid tail is discussed. (ERA citation 14:007083)