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DCLS (Dalian Coherent Light Source) is an FEL (Free-Electron Laser) userfacility at EUV (Extreme Ultraviolet). The primary accelerator of DCLS operatesat a repetition rate of 20 Hz, and the beam is divided at the end of the linearaccelerator through Kicker to make two 10 Hz beamlines work simultaneously. Inthe past year, we have completed the upgrade of the DCLS LLRF (Low-LevelRadiofrequency) system, including setting the microwave amplitude and phase fortwo beamlines based on event timing, optimizing the microwave stability, andgenerating microwave excitation with the arbitrary shape of amplitude andphase. We added two special event codes and a repetition rate division of 10 Hzin the event timing system and set the microwave amplitude and phase by judgingthe event code in LLRF. The amplitude and phase stability of the microwave wasimproved with an intra-pulse feedforward algorithm. In addition, we have alsogenerated microwave excitation with arbitrary amplitude and phase shapes tomeet the dual beam operation in the future. Detailed information on functionsor algorithms will be presented in this paper.

Low-level radiofrequency system upgrade for the Dalian Coherent Light Source