コンパクトトロイド入射装置の性能とトカマクプラズマへの入射初期実験

抄録

Compact Toroid (CT) injection is considered to be an advanced deep fueling method in tokamaks. We developed a CT injector to investigate the possibility of refueling and density control of tokamak plasmas by CT injection in the JFT-2M tokamak. The velocity of the CT was controllable from 120km/s to 190km/s in the case of CT density-6×10²¹m^-3 by changing the voltage of the acceleration bank. We demonstrated the CT penetration into the central region of OH plasmas at B_T=0.8T. The tokamak electron density increased-0.2×1019m^-3 at a rate of 2×10²¹m^-3/s and the fueling efficiency was about 20%. The penetration depth into the tokamak magnetic field was determined by the balance between the CT kinetic energy density and the toroidal magnetic field density.