Configuration of Superconducting Magnet for the reduction of leakage magnetic field and improvement of electromagnetic force characteristics

Abstract

In this paper, we consider configurations of the superconducting magnet (so call SCM) for reduction of weight of magnetic shielding and improvement of electromagnetic force characteristics. We can reduce leakage flux by SCM configuration with small size superconducting coils (so call SC coils) on these ends and make use of it to reduce the weight of magnetic shielding. We vary SCM size (parameter), keeping constant length of bogie, to seek optimal configuration of SCM. Generally speaking, SCM configuration with smaller size SC coils on these ends of coil array (and long pitch SCM configuration) is more advantageous for magnetic shielding, magnetic drag force and levitation force. On the other hands, propulsion force decreases in this case. Therefore compromise must be taken between the former and latter. Optimal SCM configuration designed from the viewpoint of magnetic shielding is consistent with the one which is designed from the viewpoint of electromagnetic characteristics.