Regular Article - Experimental Physics
Calibration strategy of the JUNO-TAO experiment
University of Chinese Academy of Sciences, Beijing, China
2 Institute of High Energy Physics, Beijing, China
3 Pontificia Universidad Católica de Chile, Santiago, Chile
4 Millennium Institute for Subatomic Physics at High-Energy Frontier-SAPHIR, Santiago, Chile
5 Sun Yat-sen University, Guangzhou, China
6 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
7 Centre d’Etudes Nucléaires de Bordeaux-Gradignan, Gradignan, France
8 Organisation de MicroÉlectronique Générale Avancée, Palaiseau, France
9 Physik-Department, Technische Universitä München, James-Franck-Str. 1, Garching, Germany
10 Cluster of Excellence PRISMA+ and Institute of Physics, Detector Laboratory, Staudingerweg 9, Mainz, Germany
11 INFN Catania and Dipartimento di Fisica e Astronomia dell’Universitá di Catania, Catania, Italy
12 Istituto Nazionale di Fisica Nucleare Sezione di Roma Tre, Rome, Italy
13 Joint Institute for Nuclear Research, Dubna, Russia
14 Moscow State University, Moscow, Russia
15 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow, Russia
16 Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
Accepted: 23 November 2022
Published online: 9 December 2022
The Taishan Antineutrino Observatory (TAO or JUNO-TAO) is a satellite experiment of the Jiangmen Underground Neutrino Observatory (JUNO). Located near a reactor of the Taishan Nuclear Power Plant, TAO will measure the reactor antineutrino energy spectrum with an unprecedented energy resolution of at 1 MeV. Energy calibration is critical to achieve such a high energy resolution. Using the Automated Calibration Unit (ACU) and the Cable Loop System (CLS), multiple radioactive sources are deployed to various positions in the TAO detector for energy calibration. The residual non-uniformity can be controlled within 0.2%. The energy resolution degradation and energy bias caused by the residual non-uniformity can be controlled within 0.05% and 0.3%, respectively. The uncertainty of the non-linear energy response can be controlled within 0.6% with the radioactive sources of various energies, and could be further improved with cosmogenic which is produced by the interaction of cosmic muon in the liquid scintillator. The stability of other detector parameters, e.g., the gain of each Silicon Photo-multiplier, will be monitored with an ultraviolet LED calibration system.
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