Аннотация
A high confinement equilibrium with nearly zero toroidal current in the central region (a ``current hole'') has been observed for the first time to persist stably for several seconds in the JT-60U tokamak. This observation indicates the possibility of stable tokamak operation without central toroidal current; the central current has previously been believed to be necessary in tokamaks. The radius of the current hole extended up to 40\% of the plasma minor radius. It was observed that the current hole was formed by the increase of the off-axis noninductive current.
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