Detector Simulation of LHAASO-KM2A with Geant4
Detector Simulation of LHAASO-KM2A with Geant4
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DOI：
10.22323/1.358.0219
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
Song-zhan Chen
中科院分区：
文献类型：
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作者：
Song-zhan Chen
LHAASO是位于四川稻城海子山的一个大型混合EAS实验。KM 2A是LHAASO的主要子阵之一，主要用于20 TeV以上的γ射线天文和宇宙线物理。整个KM 2A阵列由5195个电磁探测器（ED）和1171个μ子探测器（MD）组成。探测器的建设正在进行中，部分KM 2A阵列已于2018年2月开始运行。整个阵列将在2021年之前完成。探测器仿真是探测器性能评估和数据分析的重要基础。由于KM 2A探测器单元数多（$> 6000）、覆盖范围大（1.36 km$^{2}$）、高度差大（30 m）、光子追踪量大，在Geant 4框架下构建KM 2A探测器仿真软件是一个很大的挑战。本文介绍了基于Geant 4的KM 2A阵列仿真程序G4 KM 2A的设计。对G4 KM 2A进程进行了内存优化，避免了内存溢出。使用一些简化来显著加快G4 KM 2A的执行。文中还将MC与部分KM 2A阵列数据进行了比较。
LHAASO is a large hybrid EAS experiment located in at Haizi Mountain, Daocheng, Sichuan province. KM2A is one of the main subarrays of LHAASO mainly for $\gamma$-ray astronomy and cosmic ray physics at energy above 20 TeV. The whole KM2A array consists of 5195 electromagnetic detectors (EDs) and 1171 muon detectors (MDs). The detectors construction is underway and a part of KM2A array have been operated since February 2018. The whole array will be finished until year 2021. Detector simulation is the important foundation for estimating detector performance and data analysis. While it is a big challenge to construct the KM2A detector simulation software in the framework of Geant4 due to large number of detector units ($>$6000), huge coverage (1.36 km$^{2}$), large altitude difference (30m), and huge photons tracing. In this talk, the design of KM2A array simulation code G4KM2A basing on Geant4 is introduced. The process of G4KM2A is optimized in memory consuming to avoid memory overflow. Some simplifications are used to significantly speed up the executing of G4KM2A. A comparison between MC and the part KM2A array data are also presented.