Fast wave electron heating experiments focusing on competition between damping mechanisms on Large Helical Device

摘要

Fast Wave electron heating experiments were performed in Large Helical Device. In this experiment, magnetic fields B = 1.5 T and 1.86 T were used. Electron cyclotron emission using modulation techniques of FW injection indicated central electron heating in the 1.5T case with electron cyclotron (EC) and neutral beam (NB). In the 1.86 T case, there was no evidence of direct electron heating. Energetic ions were observed during FW heating of the NB preheated plasma