Fast muon simulation in the JUNO central detector

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Tao Lin, Zi-Yan Deng, Wei-Dong Li, Guo-Fu Cao, Zheng-Yun You and Xin-Ying Li. Fast muon simulation in the JUNO central detector[J]. Chinese Physics C, 2016, 40(8): 086201. doi: 10.1088/1674-1137/40/8/086201
Tao Lin, Zi-Yan Deng, Wei-Dong Li, Guo-Fu Cao, Zheng-Yun You and Xin-Ying Li. Fast muon simulation in the JUNO central detector[J]. Chinese Physics C, 2016, 40(8): 086201.  doi: 10.1088/1674-1137/40/8/086201 shu
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Received: 2016-01-19
Revised: 2016-03-15
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    Supported by Strategic Priority Research Program of Chinese Academy of Sciences (XDA10010900) and National Natural Science Foundation of China (11405279, 11575224)

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Fast muon simulation in the JUNO central detector

    Corresponding author: Tao Lin,
  • 1.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2.  School of Physics, Sun Yat-sen University, Guangzhou 510275, China
  • 3.  School of Physics, Nankai University, Tianjin 300071, China
Fund Project:  Supported by Strategic Priority Research Program of Chinese Academy of Sciences (XDA10010900) and National Natural Science Foundation of China (11405279, 11575224)

Abstract: The Jiangmen Underground Neutrino Observatory (JUNO) is a multi-purpose neutrino experiment designed to measure the neutrino mass hierarchy using a central detector (CD), which contains 20 kton liquid scintillator (LS) surrounded by about 17000 photomultiplier tubes (PMTs). Due to the large fiducial volume and huge number of PMTs, the simulation of a muon particle passing through the CD with the Geant4 toolkit becomes an extremely computation-intensive task. This paper presents a fast simulation implementation using a so-called voxel method: for scintillation photons generated in a certain LS voxel, the PMT's response is produced beforehand with Geant4 and then introduced into the simulation at runtime. This parameterisation method successfully speeds up the most CPU consuming process, the optical photon's propagation in the LS, by a factor of 50. In the paper, the comparison of physics performance between fast and full simulation is also given.

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