A systematic study of suprathermal ions in TJ-II plasmas heated by electron cyclotron waves

摘要

INTRODUCTION. Previous works [1-3] carried out in the TJ-II stellarator have presented a technique for measuring the thermal ion temperature and information about suprathermal ion population using high resolution Doppler spectroscopy and an ion detector based on a luminescent probe. The present work studies the ion temperatures of the suprathermal component in hydrogen and helium discharges with spatial and time resolution. We compare, for selected discharges, the information on suprathermal confined ions provided by plasma spectroscopy with that of the luminescent probe on escaping ones.