Full-Scale Prototype Power Supply for SuperKEKB Final Focus Superconducting Magnets

A full-scale prototype power supply for the SuperKEKB final focus superconducting magnets was developed. The aiming specifications of the power supply are a dc rated output of 2 kA–10 V, a current setting resolution of < 0.1 ppm, current stability of < 2 ppm/8 h, a temperature coefficient of < 0.01 ppm/degree, and a current ripple of < 1 ppm, where the assumed magnet inductance and cable resistance are 0.88–13.28 mH and 5
$\text{m}\Omega$
, respectively. High-power tests were performed, and expected results were obtained.