The JUNO experiment Top Tracker

Abstract

The main task of the Top Tracker detector of the neutrino reactor experiment Jiangmen Underground Neutrino Observatory (JUNO) is to reconstruct and extrapolate atmospheric muon tracks down to the central detector. This muon tracker will help to evaluate the contribution of the cosmogenic background to the signal. The Top Tracker is located above JUNO's water Cherenkov Detector and Central Detector, covering about 60% of the surface above them. The JUNO Top Tracker is constituted by the decommissioned OPERA experiment Target Tracker modules. The technology used consists in walls of two planes of plastic scintillator strips, one per transverse direction. Wavelength shifting fibres collect the light signal emitted by the scintillator strips and guide it to both ends where it is read by multianode photomultiplier tubes. Compared to the OPERA Target Tracker, the JUNO Top Tracker uses new electronics able to cope with the high rate produced by the high rock radioactivity compared to the one in Gran Sasso underground laboratory. This paper will present the new electronics and mechanical structure developed for the Top Tracker of JUNO along with its expected performance based on the current detector simulation.

JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo

“…The veto detector is composed of a top tracker and a water Cherenkov detector. The top tracker [26] covers half of the top surface of the water pool as shown in figure 1. It is composed of 3-layer plastic scintillators originally used in the OPERA [27,28] experiment JCAP09(2023)001 and re-utilized by JUNO.…”

Prospects for detecting the diffuse supernova neutrino background with JUNO

“…JUNO is a multi-purpose neutrino experiment under construction at Jiangmen in Guangdong Province, China. The complete detector of JUNO consists of the central detector (CD), the water pool (WP) and the top tracker (TT) [29], all are placed about 700 m underground for shielding from cosmic rays.…”

“…Frédéric Druillole 43 Ran Du 10 Shuxian Du 36 Katherine Dugas 73 Stefano Dusini 59 Hongyue Duyang 25 Jessica Eck 53 Timo Enqvist 41 Andrea Fabbri 63 Ulrike Fahrendholz 51 Lei Fan 10 Jian Fang 10 Wenxing Fang 10 Marco Fargetta 54 Dmitry Fedoseev 66 Zhengyong Fei 10 Li-Cheng Feng 37 Qichun Feng 21 Federico Ferraro 56 Amélie Fournier 43 Haonan Gan 31 Feng Gao 47 Alberto Garfagnini 60 Arsenii Gavrikov 60,59 Marco Giammarchi 56 Nunzio Giudice 54 Maxim Gonchar 66 Guanghua Gong 13 Hui Gong 13 Yuri Gornushkin 66 Alexandre Göttel 49,47 Marco Grassi 60 Maxim Gromov 68 Vasily Gromov 66 Minghao Gu 10 Xiaofei Gu 36 Yu Gu 19 Mengyun Guan 10 Yuduo Guan 10 Nunzio Guardone 54 Cong Guo 10 Wanlei Guo 10 Xinheng Guo 8 Caren Hagner 48 Ran Han 7 Yang Han 20 Miao He 10 Wei He 10 Tobias Heinz 53 Patrick Hellmuth 43 Yuekun Heng 10 Rafael Herrera 6,5 YuenKeung Hor 20 Shaojing Hou 10 Yee Hsiung 39 Bei-Zhen Hu 39 Hang Hu 20 Jianrun Hu 10 Jun Hu 10 Shouyang Hu 9 Tao Hu 10 Yuxiang Hu 10 Zhuojun Hu 20 Guihong Huang 24 Hanxiong Huang 9 Jinhao Huang 10 Junting Huang 29 Kaixuan Huang 20 Wenhao Huang 25 Xi...…”