Basic Configuration of an Indestructible Quasi-Force-Free Magnet with Magnetic Flux Density above 100 T

Abstract

The initial step in the development of an indestructible magnet with a megagauss level is the construction of its two-dimensional basic configuration, which is based on the assumption of continuous current distribution along the radius and the thickness of the winding layer. This problem is considered for a magnet with equilibrated winding layers, which generates field above 100 T. The thickness of the conductors is chosen according to the condition of allowed heating and the boundary of each conductive layer meets the condition of the absence of magnetic flux density normal component. A multi-parameter optimization of the magnetic system is performed with the purpose of achieving the acceptable von Mises stresses in the conductors. The shape of the conducting layers, distance between them and poloidal current in them are varied during optimization. Maxwell's and elasticity equations are solved by the use of ANSYS code at each iteration. The specific features of the optimization process are described, and the results of optimization are presented. The magnets configurations obtained provide the basis for further development of a three-dimensional magnet configuration, where gaps between the coil turns are filled with dielectric.