Abstract
The superconducting magnet which is installed on a maglev vehicle suffers a disturbance of magnetic fluctuation from the ground coils. This magnetic disturbance has a frequency ranging from zero to several hundred hertz and is proportional to the speed of the maglev vehicle. We constructed facilities which can simulate an actual electromagnetic disturbance on the magnet during running, and carried out electromagnetic vibrating tests. It was revealed that an extreme increase of heat load on the inner vessel of the energized magnet occurred at a particular frequency. The initial amount of the heat load surpassed the capacity of the refrigerator installed in the tank of the superconducting magnets. We have investigated the causes of these phenomena and performed an experiment for confirming the effect of an improvement in a new setup. As a result, we could broadly identify three factors of heating and now there are good prospects of largely suppressing the heating by reducing the disturbance through the folded arrangement of the ground coils and structural improvement of the magnet. This paper describes the heating phenomena of a magnet under an electromagnetic disturbance and an improvement for suppressing them as well as the historical background of maglev development.
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