Controlled central fueling for ARIES-III by compact-toroid injection

An alternative fueling scheme for ARIES-III using accelerated compact-toroids (CT) is studied. The methodology of L.J. Perkins et al. (1988) for modeling CT penetration and deposition is followed. The calculations are performed using a self-consistent, radial-zoning scheme which includes several interrelated constraints such as CT ring decay, tilting, field-line reconnection, deceleration in the external field gradient, and ring expansion/contraction. The CT injection parameters optimized for fueling of ARIES-III are presented. Advantages of CT fueling with respect to other aspects of tokamak operations and uncertainties in the CT injection modeling are also discussed. From the conservative upper-limit estimation, CTs of 40 mg with 40 cm diameter can deposit fuel directly into the center and half-way of the plasma, requiring 49 MW and 14 MW, respectively