トーラスプラズマ合体を用いた駆動型磁気リコネクションの実験的検証

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A laboratory experiment of magnetic reconnection has been developed in the TS-3 and TS-4 merging devices, using two colliding plasma toroids with cohelicity and counterhelicity. The conventional local 2-D reconnection was extended experimentally to global 3-D reconnections by introducing a new field component Bx parallel to the X-line, a global external force and a reconnection-driven global equilibrium transition. Selective ion heating accompanied by a 3-D field-aligned jet was documented during the counterhelicity reconnection without Bx, indicating its direct energy-conversion into the ion thermal energy. All of ion heating, current-sheet resistivity and reconnection rate increase significantly with decreasing Bx and with increasing external force, indicating three-component and driven features of reconnection. The anomalous sheet-current dissipation and the ion heating are both found to depend on whether the current-sheet is compressed shorter than the ion gyroradius or not.