Abstract
A conceptual design on the superconducting ohmic heating (OH) coil has been made for the GA/ANL TNS tokamak reactor studies. The primary advantage of a superconducting OH coil is the minimization of equipment and operational costs. This is primarily a result of the much reduced power supply and energy storage costs. Three-hundred megawatt peak power and 11-MW rms power would be required to drive a room-temperature copper OH coil system, as opposed to 16 and 4 MW, respectively, for a superconducting OH coil. Another reason is that, to reduce the overall TNS tokamak cost, the flux core of OH coils should be small. However, a much better utilization of the flux core can be achieved with superconducting OH coils by placing the support cylinder of superconducting toroidal field (TF) coils within the inner diameter of the superconducting OH coils, thus allowing the outer diameter of the OH coils to be in close contact with TF coils. Recent scoping studies indicate that superconducting OH coils will cost only half as much as room-temperature copper OH coils [1].
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