Behaviour of compact toroid injected into an external magnetic field

The interactions of a compact toroid (CT) plasma with an external magnetic field and a tokamak plasma have been studied experimentally on the FACT and JFT-2M devices. Fast framing camera and soft X ray emission profile measur ements indicate shift and/or reflection motions of the CT plasma. New elect rostatic probe measurements indicate that the CT plasma reaches at least up to the separatrix for discharges with toroidal field strengths of 1.0-1.4 T and that there exists a trailing plasma behind the CT. A large amplitude fluctuation on the ion saturation current and magnetic coil signals is obse rved. Power spectrum analysis suggests that this fluctuation is related to magnetic reconnection between the CT plasmoid and the toroidal field. The C T, including much of the trailing plasma, may be able to move across the ex ternal magnetic field more easily in the drift region of the injector owing to the Hall effect.