Abstract
Research activities on the JIPP Ia and Ib stellarators, the JIPP T-IIU stellarator/tokamak and the JIPP T-IIU tokamak are surveyed. In the ℓ = 3 JIPP Ia stellarator, convective transport and enhanced fluctuations were found to be responsible for the confinement behaviour. The dependence of plasma transport on the magnetic field configuration was studied on the ℓ = 2 + ℓ = 3 JIPP Ib stellarator. In the tokamak operation of JIPP T-II, a stable high-density plasma was obtained, free from major disruptions by programmed gas puffing and a second plasma current rise. Scaling laws fortthe ohmically heated ℓ = 2 stellarator plasma were obtained and compared to those for tokamaks. Major disruptions were suppressed when ι/2π>0.14. Heating characteristics of NBI, LHH, ECH and ICH were compared in both configurations. On JIPP T-IIU, ICRF heating experiments were carried out. The radial profile control of plasma parameters by programming gas puffing and plasma current waveform was shown to be effective in reducing the impurities and suppressing the growth of an m = 2 mode. Ion Bernstein wave heating was found to be promising. A current start-up experiment is also carried out on JIPP T-IIU, giving a physical picture of the start-up and the return current heating of the bulk plasma.
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