Abstract
The electron cyclotron wave current startup as a scheme to initiate ohmic discharges has been in, estimated with two circuits of open and shorted primary winding of transformer in the CT 6B tokamak. A diode shorted circuit is proposed for connection with ohmic discharges. Two gyrotron systems operated at different frequencies were used as the wave sources. The experimental results indicate that approximately equivalent transformer flux saving and reduction of starting voltage are achieved in the initial phase of the ohmic discharges for both circuits. An estimation of plasma resistance for the open circuit shows that no obvious anomalous resistance of the wave started plasma is observed.
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