Study on Mode Conversion Process into Electron Bernstein Waves and on Plasma Current Drive Mechanism by Electron Bernstein Waves toward Steady-state ST Operation

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The plasma with 10kA current was sustained at the ST configuration for 180 sec aimed at operating in steady state. A phased-array antenna system has been developed for heating and current drive experiments, and its good performance was confirmed at high power operations. Multiple ray-tracing code taking the tunneling effect into account has been developed. It was indicated poloidal index evolution along the propagation affected ray trajectories in the oblique injection required at the mode conversion. New operational window to sustain the plasma current was observed in the RF-sustained high-density plasmas at the higher incident RF power. Electron Bernstein Wave Heating / Current Drive (EBWH/CD) effects were observed in superposed RF injection into the over dense ohmic plasma. Reflectometry and radiometry systems have been developed tomeasure the density profile which is important for the mode conversion study, and to observe the thermal emission in inversed mode conversion for the EBWH/D, respectively. Non-coherent thermal emission was successfully observed at the phased array condition in the radiometry.