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SUMMARY:High quality factor and accelerating gradient of 650 MHz supercond
 ucting cavity for CEPC
DTSTART;VALUE=DATE-TIME:20240418T063000Z
DTEND;VALUE=DATE-TIME:20240418T065000Z
DTSTAMP;VALUE=DATE-TIME:20260907T000735Z
UID:indico-contribution-231@indico.nsrrc.org.tw
DESCRIPTION:Speakers: Peng Sha (IHEP\, CAS)\nThe 650 MHz single-cell super
 conducting radio-frequency (SRF) cavities used for the Circular Electron P
 ositron Collider (CEPC) were studied to achieve a high accelerating gradie
 nt (Eacc) and high intrinsic quality factor (Q0). The 650 MHz single-cell 
 cavities were subjected to a combination of buffered chemical polishing (B
 CP) and electropolishing (EP)\, and their Eacc exceeded 40 MV/m. Such a hi
 gh Eacc may result from the cold EP with more uniform removal. BCP is easy
 \, cheap\, and rough\, whereas EP is complicated\, expensive\, and precise
 . Therefore\, the combination of BCP and EP investigated in our study is s
 uitable for surface treatments of mass SRF cavities. Medium temperature (m
 id-T) furnace baking was also conducted\, which demonstrated an ultrahigh 
 Q0 of > 8E10 at 22 MV/m\, and an extremely low BCS resistance of ~ 1.0 nΩ
  was achieved at 2.0 K.  The study of CEPC 650 MHz SRF cavities may benefi
 t SRF community\, which has been referenced by PIP II.\n\nhttps://indico.n
 srrc.org.tw/event/16/contributions/231/
LOCATION: Research Building L100
URL:https://indico.nsrrc.org.tw/event/16/contributions/231/
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