Design and Performance of Power Supplies for Superconductor Insertion Devices at TLS 1.5-GeV Ring

A sophisticated power supply system was developed, installed, and successfully put into operation for the superconducting insertion devices at the 1.5-GeV Taiwan Light Source. These magnets include a superconducting wavelength shifter, a superconducting multipole wiggler, and three in-achromate superconducting wigglers. The power supply, with ±350-A/±15-V output power, is a four-quadrant bipolar switching step-down converter. The power supply, employing multiple regulation loops, slew rate control, and ultra high precision current transducer for feedback loop, is capable of delivering highly stable and reliable current to the superconducting loads. The topology, control scheme, and its performance are described in this paper. The power supply system's performance and reliability will be further improved and adopted to power low-temperature superconducting devices at the National Synchrotron Radiation Research Center in the future.