Stress distributions of coils for toroidal magnetic field

The stress distributions of D shape coils and circular coils are computed by a finite element method. The dependence of the stress distribution on the geometrical parameters of the coils and supporting methods are examined. The maximum amount of the stress of D shape coils is not much smaller than that of circular coils. However the stress distribution of D shape coils becomes much more uniform. The supporting method is as influential as the geometrical parameters of the coils on the stress distribution.