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(EXP4/10) Behaviour of Compact Toroid Injected into the External Magnetic Field

M. Nagata¹⁾, N. Fukumoto¹⁾, H. Ogawa²⁾, T. Ogawa²⁾, K. Uehara²⁾, H. Niimi³⁾, T. Shibata²⁾, Y. Suzuki⁴⁾, Y. Miura²⁾, T. Uyama¹⁾, H. Kimura²⁾, JFT-2M Group^2)
 
1) Faculty of Engineering, Himeji Institute of Technology, Himeji, Hyogo, Japan
²⁾ Department of Fusion Plasma Research, Japan Atomic Energy Research Institute, Naka, Ibaraki, Japan
³⁾ Center for Advanced Research of Energy Technology, Hokkaido University, Sapporo, Hokkaido, Japan
⁴⁾ Plasma Theory Laboratory, Japan Atomic Energy Research Institute, Naka, Ibaraki, Japan

Abstract.  Interaction of a compact toroid (CT) plasma with an external field and with a tokamak plasma has been studied experimentally on the JFT-2M and FACT devices. Fast framing camera and SX emission profile measurements indicate shift and/or reflection motions of the CT plasma. New electrostatic probe measurements indicate that the CT plasma reaches at least up to the separatrix for discharges with the toroidal field strengths of 1.0-1.4 T, and that there exists a trailing plasma behind the CT. We have observed a large amplitude fluctuation on ion-saturation current and magnetic coil signals. Power spectrum analysis suggests that this fluctuation is related to magnetic reconnection between the CT plasmoid and the toroidal field. The low density trailing plasma may be able to move across the external magnetic field more easily in the injector owing to the Hall effect.

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