Abstract
When RF power P LHH near the lower hybrid frequency is injected into the ohmically heated plasma in the WT-2 tokamak, the RF -driven current is generated ( I rf ≃12 kA) and the plasma ( n e ≃3 ×10 12 cm -3 ) is sustained by this current without ohmic current during the injection of P LHH . The efficiency of RF current drive is obtained as I rf =0.06 P LHH / n e · R (kA, kW, 10 13 cm -3 , m), where R is the major radius. The current I rf is carried by suprathermal electrons which interact resonantly with lower hybrid waves. A high frequency instability and associated relaxation oscillation are observed, which can be suppressed by a simultaneous injection of the electron cyclotron heating power.
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