Speaker
Description
The JUNO (Jiangmen Underground Neutrino Observatory) detector is outfitted with two light collection systems, a set of Large PMTs (LPMTs, 20-inch) and a set of Small PMTs (SPMTs, 3-inch). LPMTs collect the majority of light, whereas SPMTs work in the single photon counting regime and have a linear energy response based on counting hits. Thus, SPMTs provide semi-independant, complementary informations for physics analyses and reactor neutrino analysis especially. In this poster we will address the energy calibration of the SPMT system.
The first part of this poster will present the energy non-linearity caused by Cerenkov radiation and quenching effects, as well as the resolution of the system. Using gamma calibration sources located at the center of the detector and cosmogenic isotopes (12B and 11C) for electrons and positrons, we characterize the energy response of the SPMTs.
The second part will focus on the characterization of spatial non-uniformity of the SPMT system using spallation neutrons and BiPo events spread throughout the detector, as well as gamma sources deployed in known positions.