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Optimal condition for oscillating field current drive in a bootstrapped tokamak

A simple physical form of the optimal condition for oscillating field current drive (OFCD) in a bootstrapped tokamak is given. The results of the analysis suggest that the required OFCD driving frequency can be reduced in a bootstrapped tokamak directly in proportion to the reduction in the OFCD fraction of the total toroidal current, while the total required poloidal magnetic flux content is independent of the OFCD driving frequency.