Prototype of repetitive pulsed power supply for the RCS beam extraction kicker in the CSNS upgrade

Abstract

A repetitive pulsed power supply prototype has been designed and implemented for the RCS beam extraction kicker in the CSNS upgrade. The pulsed power supply features an ultra-low impedance Blumlein PFN to generate a fast front and high-current pulse, and a saturable magnetic switch to sharpen the pulse’s rising edge at the nanosecond time scale. A detailed report is provided on the practical engineering issues arising from the ultra-low impedance Blumlein PFN in the paper. Additionally, we have utilized simulation and experimental methods to evaluate the effectiveness of the saturation magnetic switch in sharpening the excitation current at the nanosecond time scale. The developed pulsed power supply is capable of generating a pulse current of 6660 A with a rise time of 248 ns, a pulse flat-top duration of 628 ns, a time jitter of ±4.5 ns, and a flat-top ripple of ≤±1 % at a repetition rate of 25 Hz. The design and experimental results of this pulsed power supply are presented in detail in this paper.