Abstract
The dynamics of the magnetic island formed inside the reconnection current layer was investigated under the strong guide field in the UTST spherical tokamak merging experiment. A pair of proximately located O- and X-points was generated at ∼5 cm away from the other X-point. The formed O- and X-points immediately started to move toward the downstream region inside the current layer, but the O-point had larger velocity and caught up the preceding X-point within 0.5 μs. The results from Doppler spectroscopy indicated that the ion flow velocity had the intermediate value between the O- and X-point velocities, suggesting that the ions flowed with approximately the same velocity with the magnetic island.
Highlights
The dynamics of magnetic reconnection has been studied for many years by variety of approaches such as theoretical studies, numerical studies, space observations, and laboratory experiments
In early study of magnetic reconnection based on the magnetohydrodynamic (MHD) theory [1], evaluated reconnection time scale did not match the observations of the explosive reconnection events in space
The observed ion flow was generally unidirectional when the generated islands traveled in one direction. These results suggest that the ions inside the current layer travel in company with the island-like magnetic structure, which is considered to be formed by the localized electron current, at a nearly same velocity
Summary
Institutes of Natural Science, National Institute for Fusion Science, Toki, Gifu, 509-5292 Japan. The dynamics of the magnetic island formed inside the reconnection current layer was investigated under the strong guide field in the UTST spherical tokamak merging experiment. A pair of proximately-located O- and X-point was generated at ~ 5 cm away from the other X-point. The formed O- and X-points immediately started to move toward the downstream region inside the current layer, but the O-point had larger velocity and caught up the preceding X-point within 0.5 s. Doppler spectroscopy indicated that the ion flow velocity had the intermediate value between the O- and X-point velocities, suggesting that the ions flowed with approximately same velocity with the magnetic island
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