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Possibility of Profile Control using Compact Toroid Injection on Large Helical Device

Compact toroid (CT) injection is an attractive method for central fueling into hot fusion plasmas. Induction of plasma rotation is expected by momentum input along the three-dimensional trajectories of the injected CT. The CT trajectories in the magnetic field of a large helical device (LHD) are calculated while changing the initial injection velocity and injection point, to determine the optimum conditions for CT injection into LHD. The possibility of central fueling is confirmed with a model CT with a diameter of 20 cm, 1022 m-3 electron density, and 300 km/s initial velocity, in the case of CT injection into an LHD magnetic field of 1.5 T. The input profiles of the density and the momentum obtained assuming a simple CT decay model show the potential of CT injection as a profile control method.