Investigation of the coupling between energetic electrons and the m/n=1/1 mode in the TCV tokamak

During ECRH/ECCD experiments on the TCV tokamak, a frequency-chirping mode with poloidal and toroidal mode numbers m=1 and n=1 is observed. Magnetic probe analysis, aided by toroidal rotation measurements with charge exchange spectroscopy, shows that the fishbone-like mode is rotating in the electron diamagnetic drift direction. The redistribution of thermal and suprathermal electrons by the mode is measured using the soft X-ray and the hard X-ray tomographic spectrometer systems. The interaction between energetic electrons and the mode is investigated by solving the dispersion relation of the fishbone mode, using the MIKE code coupled to the relativistic Fokker-Planck code LUKE.