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Description
A two-cell 1.5-GHz superconducting radio-frequency (SRF) cavity was designed and optimized by NSRRC previously, and then manufactured by Mitsubishi Heavy Industry Machinery Systems (MHI MS), Japan. Following post processes on this SRF cavity such as electrical polishing (EP), annealing, and pre-tuning, had been finished in KEK, Japan in 2023 under a cooperation agreement between NSRRC and KEK. This SRF cavity’s frequency of pi-mode was successfully tuned to the expected frequency range, by applying a longitudinal displacement on its structure to elastoplastic range. It is the first time to practically tune the resonance frequency of an SRF cavity with its interior in vacuum, as to eliminate the effect of air’s permittivity on measured resonance frequency. Meanwhile, the cryostat for this SRF cavity was designed by NSRRC and contracted to local companies. The helium vessel has been delivered and passed the cold shock and helium leaking test, whereas the vacuum vessel is still in production. The higher-order-mode (HOM) damper is contracted to Research Instruments (RI), Germany and shall be delivered in 2024. It is expected to finish the vertical test of this SRF cavity in 2024 and the module assembly in 2025. Installation, system integration, and beam commissioning are scheduled in 2025-2026. The bunch length of stored electron beam in Taiwan Photon Source (TPS) is expected to increase with a factor of 1.6 to raise the beam life time and to reduce the beam-induced heat on the magnet arrays of the in-vacuum undulators.
