Abstract
For exciting superconducting magnets has been used conventional power supply and power leads. This way has some problems: heat leak into the cryogenic part, occurrence of Joule loss in the power leads, etc. To overcome such problems, the use of superconducting magnetic flux pump has been studied. The magnetic flux pump can serve a permanent current mode switch and power leads to supply large current in superconducting magnets. However, the design method of the flux pump has not been known well. Therefore, we have developed a small size magnetic flux pump for analysis purposes to investigate its characteristics and actual performance when exciting a superconducting magnet. Furthermore, we have theoretically and experimentally examined the method to improve performances of the flux pump. As a result, we derived some important design parameters. This paper also gives a comparison between theoretical simulation and experimental results for the case of single and series-connected flux pump devices, respectively. Further it is clarified that the series- and parallel- connection of the flux pump can improve performances.
