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学科：天体物理. 空间物理学. 等离子体物理
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[Title] Accurate Reflectance Measurement of Spherical Mirror at Multi-wavelength on LHAASO-WFCTA
教研室：天体物理
发表刊物：Proceedings of Science
关键字：Cherenkov telescope;WFCTA;spherical mirror;reflectance;multi-wavelength measurement
摘要：The Wide Field of View Cherenkov Telescope Array (WFCTA) is an important component of the Large High Altitude Air Shower Observatory (LHAASO). Each Cherenkov telescope is equipped with a large-aperture spherical mirror composed of multiple sub-mirrors,whose reflectance directly affects the measurement of Cherenkov light and thus the reconstruction of cosmic-ray energy. This paper presents a dedicated reflectance measurement system designed for spherical mirrors,employing semiconductor lasers at five wavelengths (405,450,488,520,and 650 nm) and an integrating sphere coupled with a photomultiplier tube. System stability and systematic errors are carefully evaluated in laboratory tests. On-site measurements are then carried out on all 18 WFCTA telescopes,with 175 measurement points covering each spherical mirror. The average reflectance values at different wavelengths are obtained,providing a reliable experimental basis for long-term calibration and performance evaluation of the LHAASO-WFCTA telescopes.
合写作者：Wang YD,Zhu FR,Zhang SS,Wang Y,Chen L,Liu Y
第一作者：Jin M
论文编号：029
学科门类：理学
一级学科：天文学
卷号：444(HEASA2023)
页面范围：id.502
是否译文：否
发表时间：2024-09-01