LHAASO缪子探测器电荷优化测量研究  

Optimization of Charge Measurement for LHAASO Muon Detector

作　　者：王昌贝 左雄 贾焕玉[1] 庞彬宇 王辉[1] Wang Changbei;Zuo Xiong;Jia Huanyu;Pang Binyu;Wang Hui(Southwest Jiaotong University,Chengdu 611756,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China,Email:[e-mail])

机构地区：[1]西南交通大学,四川成都611756 [2]中国科学院高能物理研究所,北京100049

出　　处：《天文研究与技术》2023年第3期258-266,共9页Astronomical Research & Technology

基　　金：国家重点研发计划(2018YFA0404202);国家自然科学基金(12147208)资助.

摘　　要：高海拔宇宙线观测站(Large High Altitude Air Shower Observatory,LHAASO)主要用于探索高能宇宙线起源、高能天体演化以及新物理前沿等。其中的大面积缪子探测器(Muon Detector,MD)阵列,具有对原初伽马射线的高鉴别能力,能够完成超高能伽马射线的高灵敏度探测。缪子探测器通过阳极和第七打拿极两路信号共同读出的方式,实现1~10000个缪子的大动态范围探测。为了减小在阳极信号饱和后的区域,直接转换为打拿极信号进行测量的误差,提出了将阳极(阳极未饱和部分)和打拿极(阳极饱和部分)两部分信号进行拼接测量的电荷测量优化方案。通过数值模拟得出阳极与打拿极之间的连接方式,可以采用实验室标定的阳极、打拿极关系进行连接。数值模拟结果表明,该方案在1~10000个缪子的大动态范围内有效降低了测量误差,误差小于1%,缪子谱结构得到明显改善。利用全波形信号进行数据分析的结果与模拟结果很好符合,验证了该方案的有效性。The Large High Altitude Air Shower Observatory(LHAASO)is mainly used for exploring the origin of high-energy cosmic rays,the evolution of high-energy celestial bodies and the research of new frontiers of physics.The large area Muon Detector(MD)array has high identification ability of primary gamma rays and can detect ultra-high energy gamma rays with high sensitivity.MD achieves a large dynamic range detection of 1-10000 muons through the common readout of the anode and the seventh dynode.In order to reduce the error of directly converting the anode signal into the dynode signal in the saturated area,an optimization scheme of charge measurement was proposed by combining the anode(the unsaturated part of the anode)and the dynode(the saturated part of the anode)signals.The connection mode between the anode and the dynode is obtained by numerical simulation,and the relationship between the anode and dynode calibrated in the laboratory could be used for connection.Numerical simulation results show that the proposed scheme can effectively reduce the measurement error in the large dynamic range of 1-10000 muons,the error is less than 1%,and the muons spectrum structure is obviously improved.The results of data analysis with full waveform signal are in good agreement with the simulation results,which verifies the effectiveness of the scheme.

关 键 词：电荷测量 高海拔宇宙线观测站 缪子探测器 非线性 

分 类 号：TL822[核科学技术—核技术及应用]