Stress calculation in pulsed magnet with distributed windings

The stresses in pulsed magnet are calculated with a pulsed magnet design software (PMDS) package developed with Visual Basic 6. Stress model includes elastic and plastic deformation. The solution is given by Hooke's law and total strain theory. Prototype of 70 T coil was made. The coil windings were composed of two sections. In the inner section, four CuNb conductor layers were reinforced independently with Zylon epoxy composites. In the outer section, four soft copper layers were insulated with glass fibre and reinforced with a thick carbon layer. The thickness of reinforcing layers was optimized to distribute the strength evenly throughout the coil. Calculation indicated the stress in the coil was below the UTS (ultimate tensile strength) of the materials. In experiment., it survived at 70 T field