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The confinement of ohmically heated stellarator plasma is studied experimentally. The energy confinement time ??E increases with the total rotational transform angle ???? in the case of ????/2?? < 0.25, that is, q??(a) > 4, while ??E decreases with ????/2?? > 0.3, that is, q??(a) < 3-4, which is consistent with the Alcator scaling. When the rotational transform angle due to helical field...
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