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1. chinaXiv:201711.02280 [pdf]

The Application of SNiPER to the JUNO Simulation

Tao Lin; Jiaheng Zou; Weidong Li; Ziyan Deng; Xiao Fang; Guofu Cao; Xingtao Huang; Zhengyun You
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

The JUNO (Jiangmen Underground Neutrino Observatory) is a multipurpose neutrino experiment which is designed to determine neutrino mass hierarchy and precisely measure oscillation parameters. As one of the important systems, the JUNO o ine software is being developed using the SNiPER software. In this proceeding, we focus on the requirements of JUNO simulation and present the working solution based on the SNiPER. The JUNO simulation framework is in charge of managing event data, detector geometries and materials, physics processes, simulation truth information etc. It glues physics generator, detector simulation and electronics simulation modules together to achieve a full simulation chain. In the implementation of the framework, many attractive characteristics of the SNiPER have been used, such as dynamic loading, exible ow control, multiple event management and Python binding. Furthermore, additional e orts have been made to make both detector and electronics simulation exible enough to accommodate and optimize di erent detector designs. For the Geant4-based detector simulation, each sub-detector component is implemented as a SNiPER tool which is a dynamically loadable and con gurable plugin. So it is possible to select the detector con guration at runtime. The framework provides the event loop to drive the detector simulation and interacts with the Geant4 which is implemented as a passive service. All levels of user actions are wrapped into di erent customizable tools, so that user functions can be easily extended by just adding new tools. The electronics simulation has been implemented by following an event driven scheme. The SNiPER task component is used to simulate data processing steps in the electronics modules. The electronics and trigger are synchronized by triggered events containing possible physics signals. The JUNO simulation software has been released and is being used by the JUNO collaboration to do detector design optimization, event reconstruction algorithm development and physics sensitivity studies.

submitted time 2017-11-10 Hits320Downloads204 Comment 0

2. chinaXiv:201609.01023 [pdf]

Study of the Tracking Method and Expected Performance of the Silicon Pixel Inner Tracker Applied in BESIII

Qinglei Xiu; Mingyi Dong; Weidong Li; Huaimin Liu; Qiumei Ma; Qun Ouyang; Zhonghua Qin; Liangliang Wang; Linghui Wu; Ye Yuan; Yao Zhang
Subjects: Physics >> Nuclear Physics

The inner drift chamber of the BESIII is encountering serious aging problem after five year's running. For the first layer, the decrease in gas gain is about 26% from 2009 to 2013. The upgrade of the inner tracking detector has become an urgent problem for the BESIII experiment. An inner tracker using CMOS pixel sensors is an important candidate because of its great advantages on spatial resolution and radiation hardness. In order to carry out a Monte Carlo study on the expected performance, a Geant4-based full simulation for the silicon pixel detector has been implemented. The tracking method combining the silicon pixel inner tracker and outer drift chamber has been studied and a preliminary reconstruction software was developed. The Monte Carlo study shows that the performances including momentum resolution, vertex resolution and the tracking efficiency are significantly improved due to the good spatial resolution and moderate material budget of the silicon pixel detector.

submitted time 2016-09-14 Hits683Downloads399 Comment 0

3. chinaXiv:201609.00932 [pdf]

Simulation of natural radioactivity backgrounds in the JUNO central detector

Xinying Li; Ziyan Deng; Liangjian Wen; Weidong Li; Zhengyun You; Chunxu Yu; Yumei Zhang; Tao Lin
Subjects: Physics >> Nuclear Physics

The Jiangmen Underground Neutrino Observatory (JUNO) is an experiment proposed to determine the neutrino mass hierarchy and probe the fundamental properties of neutrino oscillation. The JUNO central detector is a spherical liquid scintillator detector with 20 kton fiducial mass. It is required to achieve a?3%/E(MeV)???????√?energy resolution with very low radioactive background, which is a big challenge to the detector design. In order to ensure the detector performance can meet the physics requirements, reliable detector simulation is necessary to provide useful information for detector design. A simulation study of natural radioactivity backgrounds in the JUNO central detector has been performed to guide the detector design and set requirements to the radiopurity of detector materials.

submitted time 2016-09-13 Hits361Downloads231 Comment 0

4. chinaXiv:201609.00922 [pdf]

Study of Photon Detection Efficiency and Position Resolution of BESIII Electromagnetic Calorimeter

Vindhyawasini Prasad; Chunxiu Liu; Xiaobin Ji; Weidong Li; Huaimin Liu; Xinchou Lou
Subjects: Physics >> Nuclear Physics

We study the photon detection efficiency and position resolution of the electromagnetic calorimeter (EMC) of the BESIII experiment. The control sample of the initial-state-radiation (ISR) process of?e+e?→γμ+μ??is used at?J/ψ?and?ψ(3770)?resonances for the EMC calibration and photon detection efficiency study. Photon detection efficiency is defined as the predicted photon, obtained by performing a kinematic fit with two muon tracks, matched with real photons in the EMC. The spatial resolution of the EMC is defined as the separation in polar (θ) and azimuthal (?) angles between charged track and associated cluster centroid on the front face of the EMC crystals.

submitted time 2016-09-13 Hits308Downloads188 Comment 0

5. chinaXiv:201609.00072 [pdf]

Study of BESIII electromagnetic calorimeter performance with radiative lepton pair events

Vindhyawasini Prasad1; Chunxiu Liu; Xiaobin Ji; Weidong Li; Huaimin Liu; Xinchou Lou
Subjects: Physics >> Nuclear Physics

We study the photon detection efficiency and position resolution of the electromagnetic calorimeter (EMC) of the BESIII detector. The control samples of the initial-state-radiation (ISR) process of?e+e?→γμ+μ??at?J/ψ?and?ψ(3770)?resonances are used for the calibration of the photon cluster shapes and photon detection efficiency study. The photon detection efficiency is defined as the fraction of predicted photon, determined by performing a kinematic fit with the four momenta of two charged tracks only, matched with the actual photons in the EMC. The spatial resolution of the EMC is studied in polar (θ) and azimuthal (?) angle directions in a cylindrical coordinate system centered at the interaction point, with z-axis along the beam direction.

submitted time 2016-09-06 Hits293Downloads182 Comment 0

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