  The electron and positron accelerator complex at KEK offers unique
experimental opportunities in the fields of elementary particle physics with
SuperKEKB collider and photon science with two light sources. In order to
maximize the experimental performances at those facilities the injector LINAC
employs pulse-to-pulse modulation at 50 Hz, injecting beams with diverse
properties. The event-based control system effectively manages different beam
configurations. This injection scheme was initially designed 15 years ago and
has been in full operation since 2019. Over the years, quite a few enhancements
have been implemented. As the event-based controls are tightly coupled with
microwave systems, machine protection systems and so on, their modifications
require meticulous planning. However, the diverse requirements from particle
physics and photon science, stemming from the distinct nature of those
experiments, often necessitate patient negotiation to meet the demands of both
fields. This presentation discusses those operational aspects of the
multidisciplinary facility.
