Development of a high-repetition-rate lumped-inductance kicker magnet prototype for the beam switchyard of SHINE

The Shanghai high-repetition-rate X-ray free-electron laser and extreme light facility (SHINE) operates at a maximum repetition rate of 1 MHz. Kicker magnets are key components that distribute electron bunches into three different undulator lines in a bunch-by-bunch mode. The kicker field width must be less than the time interval between bunches. A lumped-inductance kicker prototype was developed using a vacuum chamber with a single-turn coil. The full magnetic field strength was 0.005 T. This paper presents the requirements, design considerations, design parameters, magnetic field calculations, and measurements of the kicker magnets. The relevant experimental results are also presented. The pulse width of the magnetic field was approximately 600 ns, and the maximum operation repetition rate was 1 MHz. The developed kicker satisfies the requirements for the SHINE project. Finally, numerous recommendations for the future optimization of kicker magnets are provided.