HIGH-REPETITION HIGH-DUTY TOKAMAK DISCHARGE WITH LONG-DURATION

A long duration of high-repetition high-duty discharge was successfull y obtained up to 60 s in a small research toroidal device, current sus taining tokamak in Nagoya University (CSTN-III), by employing a compac t pulse width modulation (PWM) invertor power supply. Slow variations of plasma parameters over the whole duration have been observed. The d evice has a useful potential for studying a long pulse discharge behav iour which is one of the critical issues for long or steady-state oper ation of magnetically confined fusion reactors.