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We discuss the design features of a commercial tokamak reactor in which day long pulses are provided by the volt-second capability of the ohmic heating transformer. Illustrative parameters are a major radius of 9.7 m, a minor radius of 1.95 m, an average toroidal beta of 0.036, a magnetic field on axis of 6.1 T, a neutron wall loading of 2.3 MW/m2 and a thermal power level of 4000 MW. The tokamak is modularized into units which consist of two toroidal field coils, blanket and shield and first wall. The removal of the two toroidal field coils associated with a module would be carried out without warming up the rest of the toroidal field coil set.

A modular commercial tokamak reactor with day long pulses