Speaker
Qingmin Zhang
(Xi'an Jiaotong University)
Description
The Jiangmen Underground Neutrino Observatory (JUNO), a 20 kton multi-purpose underground liquid scintillator (LS) detector, is under construction in China to mainly determine the neutrino mass hierarchy (MH) by detecting reactor anti-neutrinos. The center detector of JUNO is an acrylic sphere with a diameter of 35.4 m containing about 20,000 ton of liquid scintillator as the target and equipped with ~17000 20’’ PMT + ~35000 3’’ PMT , which is the key of the whole facility. The details of the CD will be presented.
JUNO Central Detector needs to be thoroughly calibrated to achieve an overall energy resolution of 3% at 1 MeV, and an energy nonlinearity much better than 1%. Therefore a thorough calibration system complex is is needed to be capable to deploy multiply sources, to cover the entire energy range of reactor neutrinos, and to achieve a full-volume position coverage inside the detector. Radiation source geometry has been designed to minimize the optical shadowing effects as well as the energy loss effects. Then the calibration system including a fully automated calibration unit (ACU) serving the central axis of the detector, a cable loop system (CLS) carrying the sources to scan an off-center plane, a remotely operated under-liquid-scintillator vehicles (ROV) and a Guide Tube Calibration System(GTCS) aiming at calibrating the boundary effect, will be demonstrated respectively.
Author
Qingmin Zhang
(Xi'an Jiaotong University)
Co-authors
Dr
Mengjiao Xiao
(University of Maryland, College Park)
Stefano Dusini
(Universita e INFN, Padova (IT))
Zhimin Wang
(Institute of high energy physics, Beijing)
