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SUMMARY:Implementation of the World's Largest Liquid Scintillator Detector
  and Its Radioactivity Background Measurement
DTSTART;VALUE=DATE-TIME:20260423T020000Z
DTEND;VALUE=DATE-TIME:20260423T033000Z
DTSTAMP;VALUE=DATE-TIME:20260506T225400Z
UID:indico-event-4951@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Jiajun Li (中山大学)\n\nAbstract:The Jiangmen Un
 derground Neutrino Observatory (JUNO) is a 20-kiloton liquid scintillator 
 (LS) detector built to determine the neutrino mass hierarchy and achieve p
 recision measurements of neutrino oscillation parameters. Its rich physics
  program also includes solar neutrinos\, supernova neutrinos\, geoneutrino
 s\, and atmospheric neutrinos. Achieving these goals requires both an unpr
 ecedentedly large and ultrapure LS target\, as well as a thoroughly charac
 terized radioactive background environment. This talk presents my core con
 tributions to the JUNO experiment\, spanning detector commissioning to fir
 st physics results\, with a focus on the detector filling and background a
 nalysis. I will describe the design and operation of the Filling\, Overflo
 w and Circulation (FOC) system\, which completed the filling of the world'
 s largest LS detector with high precision\, high safety\, a high degree of
  automation\, and exceptional radiopurity preservation. Real-time monitori
 ng during filling revealed LS stratification due to temperature difference
 s. I will then present a systematic analysis of key radioactive background
 s. Using 214BiPo\, 212BiPo\, and 210Po as probes\, I quantified the intrin
 sic 238U and 232Th concentrations at the 10−17 g/g level—directly veri
 fying the ultra-high purity of JUNO's LS. These results establish a solid 
 low-background foundation for JUNO's broad physics program.Biography:Jiaju
 n Li is a PhD candidate in Physics at Sun Yat-sen University under the sup
 ervision of Professor Jiajie Ling. He specializes in neutrino physics\, de
 tector development\, low-background measurement and liquid handling system
 s. During his doctoral studies\, he has taken a leading role in the JUNO e
 xperiment\, especially in detector filling and background characterization
 . During his master’s studies\, he worked on dual-phase argon TPC detect
 ors and liquid argon detector projects\, where he also gained rich experie
 nce in cryogenic systems and safety design. He has accumulated comprehensi
 ve expertise in detector development\, system integration and experimental
  operation.Host: Prof. Yue MengAlternative online link：https://meeting.t
 encent.com/dm/EhxtwcIUit4kID:436212821  Password: 123456\n\nhttps://indic
 o-tdli.sjtu.edu.cn/event/4951/
LOCATION:5#/6th-603 - Meeting Room 603 (Science Building)
URL:https://indico-tdli.sjtu.edu.cn/event/4951/
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