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THE DESIGN OF D-SHAPE COILS OF NULL BENDING-MOMENT AND CONSTANT TENSION FOR FUSION DEVICES

For magnets used in tokaamaks and other toroidal fusion devices, the concept of null bending-moment and constant tension coil was proposed to reduce the big stresses caused by the ring effect of toroidal magnetic field. The numerical solution is obtained for the differential equation of D-shape coil. At the singularity points we make transformations. And as examples, we have designed three types of D-shape superconducting coils. The results show that the stress in a D-shape coil is only one third of that in a circular coil.