The YAG Lidar System Applied in LHAASO

	The YAG Lidar System Applied in LHAASO
	Sun, Q. N.34; Geng, L. S.33; Li, X.34; Chen, L.34; Liu, H.34; Wang, Y.34; Zhu, F. R.34; Zhang, Y.33; Cao, Zhen 30,31,32; Aharonian, F.28,29
	2022-03-18
会议日期	2021-07-12
会议地点	Virtual, Berlin, Germany
关键词	YAG-Lidar system atmosphere monitoring LHAASO
卷号	395
英文摘要	The atmospheric quality plays an important role in the air shower observation by the Wide Field-of-view Cherenkov Telescope Array (WFCTA) of LHAASO. A YAG imaging lidar system was developed to continuously monitor the calorimetric information. The accuracy of atmospheric monitoring is dependent on the pulse energy, the YAG laser’s beam parameters and the angular repeatability of a High-precision 3D lifting Rotating Platform (HiRoP). Therefore, we designed an optical system for this lidar with a beam splitter to divide the laser beam into a reference beam and a calibrating beam with a certain ratio and coupled the beam paths with the movement of HiRoP. Thus, every pulse energy of the calibrating beam, which has the same energy fluctuation with respect to the reference beam recorded by a power meter, could be calculated by the ratio of the two beams. Great cares were also taken to characterize the beam size, polarization and divergence of the laser. Meanwhile, a high-precision home-made thermotank was designed to control the temperature and humidity to improve the performance and stability of our laser system, which resulting in a thermal fluctuation less than 2 C inside the container in the winter at an altitude of 4410 m. As a result, the pulse energy fluctuation of the laser beam for calibration was improved from 5 % to less than 2 %. As a result, we have successfully attained distinguishable full-WFCTA-view scanning Laser images in different air conditions, which could be used for the atmospheric quality analysis in further. © Copyright owned by the author(s).
产权排序	第31完成单位
会议录	Proceedings of Science
资助机构	National Natural Science Foundation of China[1194740] ; Department of Science and Technology of Sichuan Province[2020YFSY001] ; Department of Science and Technology of Sichuan Province[2021YFSY003]
会议录出版者	Sissa Medialab Srl
文献子类	Conference article (CA)
学科主题	天文学 ; 天体物理学 ; 高能天体物理学 ; 核科学技术
语种	英语
内容类型	会议论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/25689]
专题	星系类星体研究组
作者单位	1.College of Physics, Sichuan University, Sichuan, Chengdu, 610065, China; 2.National Space Science Center, Chinese Academy of Sciences, Beijing, 100190, China 3.Key Laboratory of Radio Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Jiangsu, Nanjing, 210023, China; 4.Moscow Institute of Physics and Technology, Moscow, 141700, Russia; 5.Department of Physics, Faculty of Science, Mahidol University, Bangkok, 10400, Thailand; 6.Yunnan Observatories, Chinese Academy of Sciences, Yunnan, Kunming, 650216, China; 7.Tsung-Dao Lee Institute, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China; 8.School of Physical Science and Technology, Guangxi University, Guangxi, Nanning, 530004, China; 9.School of Physics, Peking University, Beijing, 100871, China; 10.Institute for Nuclear Research of Russian Academy of Sciences, Moscow, 117312, Russia;
推荐引用方式 GB/T 7714	Sun, Q. N.,Geng, L. S.,Li, X.,et al. The YAG Lidar System Applied in LHAASO[C]. 见:. Virtual, Berlin, Germany. 2021-07-12.