THE LEAKAGE CURRENT INDUCED BY STRAY CAPACITANCE IN THE PULSE MAGNET SYSTEM

A huge amount of current must be provided during the nominal operation of the pulse magnet system in TPS (Taiwan Photon Source).It comes with all kinds of electromagnetic noises, including radiated and conducted EMI (electromagnetic interferences). The EM interferences will affect the sophisticated electronic equipments near the pulse magnets. Therefore, how to design the supporting and enclosure of the pulse magnet becomes a very far reaching issue. The primary object of this article is to clarify the paths of conducted EMI, especially resulted from capacitance induction. Furthermore, some geometrical suggestions which had been tested are listed in this paper as the guidelines of the pulse magnet design. According to the measurement, proper distance and surface area lead to sufficient insulation and reduce the leakage current under the expected value.