The Comic power loss in the coils of external ring traps is minimized with respect to the thermonuclear power production. In the case of the DT-reaction this leads to dimensions and power densities being relevant to full-scale reactors. Not only superconducting or refrigerated coil windings can thus be used, but also hot-coil systems which are operated at several hundred degrees centigrade and form part of a steam cycle and power extraction system, for hot coils the problems of void formation and tritium regeneration have to be further examined. The high beta value leads to moderately large coil stresses;finally, replacement and repair become simplified by the present coil geometry.
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