Performance of a scintillation detector array operated with LHAASO-KM2A electronics     

Zhen Wang  Yiqing Guo  Hui Cai  Jinfan Chang  Tianlu Chen  Danzengluobu  Youliang Feng  Qi Gao  Quanbu Gou  Yingying Guo  Chao Hou  Hongbo Hu  Labaciren  Cheng Liu  Haijin Li  Jia Liu  Maoyuan Liu  Bingqiang Qiao  Xiangli Qian  Xiangdong Sheng  Zhen Tian  Qun Wang  Liang Xue  Yuhua Yao  Shaoru Zhang  Xueyao Zhang  Yi Zhang 《Experimental Astronomy》2018,45(3):363-377

A scintillation detector array composed of 115 detectors and covering an area of about 20000 m² was installed at the end of 2016 at the Yangbajing international cosmic ray observatory and has been taking data since then. The array is equipped with electronics from Large High Altitude Air Shower Observatory Square Kilometer Complex Array (LHAASO-KM2A) and, in turn, currently serves as the largest debugging and testing platform for the LHAASO-KM2A. Furthermore, the array was used to study the performance of a wide field-of-view air Cherenkov telescope by providing accurate information on the shower core, direction and energy, etc. This work is mainly dealing with the scintillation detector array. The experimental setup and the offline calibration are described in detail. Then, a thorough comparison between the data and Monte Carlo (MC) simulations is presented and a good agreement is obtained. With the even-odd method, the resolutions of the shower direction and core are measured. Finally, successful observations of the expected Moon’s and Sun’s shadows of cosmic rays (CRs) verify the measured angular resolution.  相似文献