WHP005

We report on the status and upgrade plans for HiSOR, the synchrotron radiation facility at Hiroshima University. Operational since 1996, HiSOR is a compact source of soft X-rays and EUV light, having supported 155 external users in FY2024, 27% of whom were international researchers. However, the system is increasingly challenged by its aging infrastructure. Since January 2024, three water leaks have been recorded within just 6 months. Each incident occurred in the ultra-high vacuum section, resulting in extended operational downtimes. In late 2024, damage to the tuner of the RF cavity led to a three-month shutdown. Ongoing malfunctions are expected, posing a threat to the facility’s competitiveness and accessibility. To address these challenges, we are considering a major upgrade focused on redesigning the storage ring. Current plans include compact and low emittance magnetic lattice with combined-function magnets, double RF system and a full energy injector.