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The electron and positron accelerator complex at KEK offers uniqueexperimental opportunities in the fields of elementary particle physics withSuperKEKB collider and photon science with two light sources. In order tomaximize the experimental performances at those facilities the injector LINACemploys pulse-to-pulse modulation at 50 Hz, injecting beams with diverseproperties. The event-based control system effectively manages different beamconfigurations. This injection scheme was initially designed 15 years ago andhas been in full operation since 2019. Over the years, quite a few enhancementshave been implemented. As the event-based controls are tightly coupled withmicrowave systems, machine protection systems and so on, their modificationsrequire meticulous planning. However, the diverse requirements from particlephysics and photon science, stemming from the distinct nature of thoseexperiments, often necessitate patient negotiation to meet the demands of bothfields. This presentation discusses those operational aspects of themultidisciplinary facility.

Beam Operation for Particle Physics and Photon Science with Pulse-to-Pulse Modulation at KEK injector LINAC