Pulse-to-pulse Beam Modulation for 4 Storage Rings with 64 Pulsed Magnets

Abstract

In 2017, sixty-four pulsed magnets (28 quadrupoles and 36 steerings) were installed in the KEK electron positron linac for simultaneous injection to four different rings. Since each ring requires different injection energy, magnetic field in the injector linac has to be changed shot by shot (every 20 ms) according to the destination of the beam. To realize such operation, novel pulsed power supplies and an EVENT timing system compatible PXI based control system were developed. Installation and commissioning of the system were successful and it has been working for one year without severe trouble.