Speaker
Description
The Jiangmen Underground Neutrino Observatory (JUNO) is a large-scale liquid scintillator detector under construction for neutrino detection. The detector will be situated in a laboratory ~700 meters underground. As its primary physics goals, neutrino mass ordering and precision oscillation parameter measurements require stringent systematic control of its measured reactor neutrino energy spectrum.Dual calorimetry, a pioneering technique in the JUNO experiment, ensures high-precision systematics control in detector calorimetry by integrating two distinct photosensor and electronic systems. This setup encircles a 20 kton liquid scintillator, featuring a photon-integration-based system with approximately 17,600 20-inch large PMTs (LPMTs) and a photon-counting-based system with around 25,600 3-inch small PMTs (SPMTs). The LPMT system is designed for maximal light detection to achieve 3% energy resolution at 1MeV. As the second calorimetry, the SPMT system is introduced to disentangle the degeneracy of calorimetry responses, isolate the charge non-linearity effects and provide a linear charge reference for LPMT. This dual-system approach enhances LPMT charge measurement accuracy through meticulous reconstruction, calibration, and monitoring, thereby fortifying JUNO's systematic control and measurement accuracy. Central to this strategy is the Dual Calorimetry Calibration (DCC), designed to fine-tune each LPMT channel's potential non-linear charge responses using UV laser, radioactive, and cosmogenic sources. Due to their design, the SPMTs can serve as a robust linear charge reference for LPMTs, thus controlling their charge response. This poster delves into the dual calorimetry's scientific basis, detailing its motivation, conceptual framework, and the DCC's methodology and anticipated efficacy. The discussion extends to practical DCC application techniques utilizing UV laser and radioactive sources.
| Poster prize | Yes |
|---|---|
| Given name | Jiajun |
| Surname | Li |
| First affiliation | Sun Yat-Sen University |
| Institutional email | lijj295@mail2.sysu.edu.cn |
| Gender | Male |
| Collaboration (if any) | JUNO |
