Abstract
Lower hybrid current-drive experiments have been carried out on the PLT Tokamak. Steady currents up to 175 kA have been maintained for three seconds and 400 kA for 0.3 s by the rf power alone. The principal current carrier appears to be a high energy (∼ 100 keV) electron tail, concentrated in the central 20–40 cm diameter core of the 80 cm PLT discharge. Effective current drive is observed only for n̄e ⩽ 8 × 1012 cm-3. This limitation may be a wave propagation phenomenon and not a fundamental plasma physics effect.
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