Abstract
Abstract High-power ion heating of merging spherical tokamak (ST) plasma has been investigated using TS-3U, TS-4, UTST at the University of Tokyo for future direct access to burning high-beta ST plasma without using any additional heating. We developed a two-fluid / kinetic interpretation of the promising scaling of ion heating energy increasing with the square of reconnecting magnetic field Brec ~ poloidal magnetic field Bp. We found that the reconnection heating forms interesting high-beta ST plasmas with hollow current and broad/ hollow Ti profiles. Those high-beta ST plasmas often have reversed-shear or absolute minimum-B profiles, depending on their reconnection heating power and q-values.
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