Spherical Tokamak Generation and Merging on UTST using Ex-Vessel Poloidal Field Coils Only

Magnetic energy injection through pull magnetic reconnection has been studied in the University of Tokyo Spherical Tokamak (UTST) using external poloidal field coils. Under constant plasma inflow, the magnetic energy of the produced ST increases as the guide field B t is increased from zero to the optimized value B t0 , while it decreases after B t exceeds B t0 . The pull reconnection process was often accompanied by the formation of plasmoids around the X-point. The reconnection rate was found to change with time, depending on the formation of plasmoids and the magnetic energy injection. Plamoids enhance the reconnection rate.

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Plasmoid-Induced Pull Reconnection Experiments in University of Tokyo Spherical Tokamak

Watanabe

Ono

Yamada

et al. 2013

Plasma and Fusion Research

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Experimental Results of Ion Heating by Magnetic Reconnection Using External Coils

Kamio

Watanabe

Yamasaki

et al. 2014

Plasma and Fusion Research

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One of the purposes of the UTST device is to demonstrate of magnetic reconnection heating using external coils to conduct field line merging. In order to measure the ion heating, a Doppler spectroscopy system was developed. By increasing the reconnection magnetic field to 17 mT from 4 mT after the UTST upgrade, the ion heating was observed for the first time in the UTST reconnection experiments. The ion temperature increased to 50 eV from 15 eV due to reconnection during the plasma merging.

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Spherical Tokamak Generation and Merging on UTST using Ex-Vessel Poloidal Field Coils Only

Cited by 2 publications

References 12 publications

Plasmoid-Induced Pull Reconnection Experiments in University of Tokyo Spherical Tokamak

Plasmoid-Induced Pull Reconnection Experiments in University of Tokyo Spherical Tokamak

Experimental Results of Ion Heating by Magnetic Reconnection Using External Coils

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