Low-aspect-ratio stellarator configurations can be realized by using torsatron windings. Plasmas with aspect ratios in the range of 3.5 to 5 can be confined by these low-aspect-ratio torsatron configurations. Stable operation at high beta should be possible in these devices if a vertical field coil system is adequately designed to avoid breaking of the magnetic surfaces at finite beta.
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Carreras et al. (1988) studied this question.
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