Magnetic shielding of small high power SMES

Abstract

Small high power SMES in toroidal and solenoidal geometries are compared. The toroidal 1.4 MJ SMES currently under construction at Technische Universitat Munchen serves as example. The hypothetical equivalent solenoid is surrounded by a ferromagnetic shield, so that the stray field of the toroidal SMES is not exceeded. The shape of the shield is optimized with respect to the mass by using a stochastic strategy in combination with a deterministic method. Finally the superconductor losses and the eddy current losses in the shield are calculated for a sinusoidal load cycle.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>