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Due to the properties of high temperature superconducting (HTS) materials,current attenuation is inevitable during the closed-loop operation of HTSmagnets. When a contact DC power supply is used to supplement this attenuation,it inevitably creates a huge thermal burden on the cryogenic system. The fluxpump is a revolutionary new power source that can charge closed-loop HTS magnetwirelessly. However, for HTS magnets with a large inductance, such as particleaccelerator magnets and magnetic confinement magnet in Tokamak devices, theflux pump cannot fast adjust the DC current of the magnet, due to its small DCoutput voltage. Here, we present a method to fast regulate the current in aclosed-loop HTS magnet using a contact DC power supply and persistent currentswitch (PCS). After current regulation, the HTS magnet is operated in thepersistent current mode (PCM) with a flux pump. By applying the "four-quadrant"control theory of the flux pump allows, the current in HTS magnet is controlledwith high stability. This study provide a power strategy for the fast currentregulation and maintenance of persistent current in the HTS magnet, enablingthe industrial applications of flux pumps for HTS magnets with largeinductance.

Fast Current Regulation and Persistent Current Maintenance of High-Temperature Superconducting Magnets with Contact Power Supply and Flux Pump