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The primary accelerator of DCLS (Dalian Coherent Light Source) operates at arepetition rate of 20 Hz now, and the beam is divided at the end of the linearaccelera-tor through Kicker to make two 10 Hz beamlines work simultaneously.For the simultaneous emission FEL of two beamlines, the beam energy of the twobeamlines is required to be controlled independently, so we need to set theamplitude and phase of each beamline. This paper implements a microwaveamplitude and phase setting function based on event timing. We upgraded theEVG/EVR event timing system and LLRF (Low-Level Radiofrequency) system. Twospecial event codes and a repetition rate division of 10 Hz are added to theevent timing system, and we can set the microwave amplitude and phase byjudging the event code in LLRF. We ulti-mately perform the microwave triggeringat a repetition rate of 10 Hz for each beamline and validate this functionthrough beam experiments.

The microwave amplitude and phase setting based on event timing for the DCLS