Simulation study on photon generation and collection of tower applied to NICA-MPD electromagnetic calorimeter
Simulation study on photon generation and collection of tower applied to NICA-MPD electromagnetic calorimeter
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NICA-MPD电磁量热仪光子产生与收集塔仿真研究
DOI：
10.1088/1748-0221/17/01/t01004
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发表时间：
2022-01
影响因子：
1.3
通讯作者：
Xiaodong Wang
中科院分区：
文献类型：
--
作者：
Xiaoyu Peng;Kun Zhu;Xuantao Ji;Min Xiao;Fengjiao Luo;Yuhe Huang;Jin Zhu;Wangchen Xiao;Siyuan Luo;Lie He;Xiaodong Wang
Shashlik塔是俄罗斯核子离子对撞机（NICA）多用途探测器（MPD）的关键探测器——电磁量热计（ECal）中测量光子和电子能量和位置的重要部件，它由吸收体和闪烁体交替组成，被反射体包围，并通过移波长（WLS）光纤与硅光电倍增管（SiPM）耦合。本文基于GEANT4软件，模拟了吸收器、反射器和WLS光纤所采用的材料、光纤的长度和曲率以及电子入射位置对塔架光子传输性能的影响。研究了电子束能量高斯偏差和10%能量范围内的扩散对塔架能量分辨率的影响。结果表明，低抛光度的吸收器、高抛光度的TiO_2反射器以及弯曲曲率半径大于11 cm的Y-11 WLS光纤可以显著提高光输出。此外，沿塔中心注入的电子可以使SiPM中的光子位置分布更加均匀。闪烁体中光子的产生时间和到达SiPM的时间都服从朗道分布。最后，对于平均能量为3 GeV、分布在能量范围内10%的高斯偏差电子束，塔的能量分辨率可达3.8%/√(E) （GeV）以上。
Shashlik tower, which is composed of absorbers and scintillators alternately, surrounded by reflector and coupled with Silicon Photomultiplier (SiPM) by Wavelength-Shifting (WLS) fibers, is a significant component to measure the energy and position of photons and electrons in Electromagnetic Calorimeter (ECal), a key detector of the Multi Purpose Detector (MPD) at the Nuclotron-based Ion Collider facility (NICA) in Russia. In this paper, the effect of materials adopted for absorber, reflector and WLS fiber, the length and curvature of fibers and the electrons incident position on photons transmission performance of tower is simulated based on GEANT4 software. The impact of Gaussian deviation's electron beam energy and spread of 10% in the energy range on the energy resolution of tower is also studied. Results show that the low polishing degree absorber, the high polishing degree TiO_2 reflector and the type of Y-11 WLS fibers bent with a curvature radius of greater than 11 cm can significantly improve the light output. In addition, electrons injected along the centre of tower can make photons position distribution in SiPM more uniform. The generation time of photons in scintillators and time of arrival at the SiPM both obey the Landau distribution. Finally, the energy resolution of tower can be better than 3.8%/√(E) (GeV) for a Gaussian deviation's electron beam with an average energy of 3 GeV and spread of 10% in the energy range.
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影响因子：
2.8
作者：
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