Data quality control system and long-term performance monitor of LHAASO-KM2A

IF 4.2 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Zhen Cao , F. Aharonian , Axikegu , Y.X. Bai , Y.W. Bao , D. Bastieri , X.J. Bi , Y.J. Bi , W. Bian , A.V. Bukevich , Q. Cao , W.Y. Cao , Zhe Cao , J. Chang , J.F. Chang , A.M. Chen , E.S. Chen , H.X. Chen , Liang Chen , Lin Chen , X. Zuo
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引用次数: 0

Abstract

The KM2A is the largest sub-array of the Large High Altitude Air Shower Observatory (LHAASO). It consists of 5216 electromagnetic particle detectors (EDs) and 1188 muon detectors (MDs). The data recorded by the EDs and MDs are used to reconstruct primary information of cosmic-ray and gamma-ray showers. To ensure the reliability of the LHAASO-KM2A data, a three-level quality control system has been established. It is used to monitor the status of detector units, stability of reconstructed parameters and the performance of the array based on observations of the Crab Nebula and Moon shadow. This paper will introduce the control system and its application on the LHAASO-KM2A data collected from August 2021 to July 2023. During this period, the pointing and angular resolution of the array were stable. From the observations of the Moon shadow and Crab Nebula, the results achieved using the two methods are consistent with each other. For example, according to the observation of the Crab Nebula with KM2A at energies from 25 TeV to 100 TeV, the time averaged pointing errors are estimated to be 0.003°±0.005° and 0.001°±0.006° in the R.A. and Dec directions, respectively.

LHAASO-KM2A 的数据质量控制系统和长期性能监测器
KM2A 是大型高空气流淋浴观测站(LHAASO)最大的子阵列。它由 5216 个电磁粒子探测器(ED)和 1188 个渺子探测器(MD)组成。电磁粒子探测器和μ介子探测器记录的数据用于重建宇宙射线和伽马射线阵雨的主要信息。为了确保 LHAASO-KM2A 数据的可靠性,建立了一个三级质量控制系统。它用于监测探测器单元的状态、重建参数的稳定性以及基于蟹状星云和月影观测的阵列性能。本文将介绍该控制系统及其在2021年8月至2023年7月收集的LHAASO-KM2A数据上的应用。在此期间,阵列的指向和角分辨率都很稳定。从对月影和蟹状星云的观测来看,两种方法取得的结果是一致的。例如,根据KM2A在25TeV至100TeV能量下对蟹状星云的观测,估计其时间平均指向误差在R.A.和Dec方向分别为-0.003°±0.005°和0.001°±0.006°。
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来源期刊
Astroparticle Physics
Astroparticle Physics 地学天文-天文与天体物理
CiteScore
8.00
自引率
2.90%
发文量
41
审稿时长
79 days
期刊介绍: Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.
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