Superconducting magnet development for fusion

The challenge of superconductivity in magnet design is discussed. Stability requirements imply that sufficient helium will be used. The largest magnet in the Mirror Program is the MFTF Yan-yang coil pair, as shown. The structure, with its solenoids, and cryogenic aspects, is defined. A Tandem Mirror TDF and several other Tandem Mirror Reactor studies are touched upon. The tandem mirror concept represents a linear system with special end cells to reduce losses. An alternate concept is a set of linked mirrors formed into a large aspect ratio Tokamak, called a ''bumpy torus.'' This EBT-P will be constructed at Oak Ridge National Laboratory. Finally, tokamak systems, and the difficulties which the pulsed nature and the more complex magnetic system raises, are discussed. Toroidal field coils and poloidal magnets (a 50kA poloidal field conductor) are being developed