Stable and clean AC tokamak discharges have been achieved in the STOR-1M device. The plasma current is reversed from +4.1 kA to −4.0 kA within 1.9 ms. During the reversal, no disruptive behaviour is observed, the loop voltage changes smoothly from +1 V to −5 V without any spike, and impurities are not released. An electron density of (2–4) × 10 12 cm −3 is maintained during current reversal. The possibility of continuous tokamak operation with a low frequency alternating plasma current is discussed.
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Mitarai et al. (1987) studied this question.
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