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SUMMARY:Design and Construction of a 1.5-GHz Two-Cell SRF Module in NSRRC
DTSTART;VALUE=DATE-TIME:20240418T084000Z
DTEND;VALUE=DATE-TIME:20240418T090000Z
DTSTAMP;VALUE=DATE-TIME:20260906T235006Z
UID:indico-contribution-239@indico.nsrrc.org.tw
DESCRIPTION:Speakers: Chih-Hung Lo ()\nA two-cell 1.5-GHz superconducting 
 radio-frequency (SRF) cavity was designed and optimized by NSRRC previousl
 y\, and then manufactured by Mitsubishi Heavy Industry Machinery Systems (
 MHI MS)\, Japan.  Following post processes on this SRF cavity such as elec
 trical 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 exp
 ected frequency range\, by applying a longitudinal displacement on its str
 ucture to elastoplastic range.  It is the first time to practically tune t
 he resonance frequency of an SRF cavity with its interior in vacuum\, as t
 o eliminate the effect of air’s permittivity on measured resonance frequ
 ency.  Meanwhile\, the cryostat for this SRF cavity was designed by NSRRC 
 and contracted to local companies.  The helium vessel has been delivered a
 nd passed the cold shock and helium leaking test\, whereas the vacuum vess
 el is still in production.  The higher-order-mode (HOM) damper is contract
 ed 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 bea
 m commissioning are scheduled in 2025-2026.  The bunch length of stored el
 ectron beam in Taiwan Photon Source (TPS) is expected to increase with a f
 actor of 1.6 to raise the beam life time and to reduce the beam-induced he
 at on the magnet arrays of the in-vacuum undulators.\n\nhttps://indico.nsr
 rc.org.tw/event/16/contributions/239/
LOCATION: Research Building L100
URL:https://indico.nsrrc.org.tw/event/16/contributions/239/
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