The paper describes the main results of currentless operation in stellarator/heliotron experiments. Various heating methods (ECRH, ICRH and NBI) with a power up to 4MW have been applied in Wendelstein VII-A, Heliotron E, L-2 and Uragan 3. Strong increase of impurity radiation terminates the discharge in NBI-heated plasmas. Toroidal currents, driven either by the plasma pressure or the heating mechanism, have been observed in several experiments. New experiments, ATF and Wendelstein VII-AS will start operation in 1987. Main aim of theoretical efforts is to increase β-limits of equilibrium and MHD-stability. This led to the Heliac concept and the concept of the Advanced Stellarator. Both in the field of torsatrons/heliotrons and advanced stellarators activity has started to plan the next generation of major experiments.
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Horst F. G. Wobig (1987) studied this question.
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