Performances and long-term stability of the LHAASO-KM2A prototype array

LIU Jia; SHENG Xiang-Dong; HE Hui-Hai; ZHAO Jing; CHANG Jin-Fan; GU Min-Hao; HOU Chao; L&Uuml; Hong-Kui

doi:10.1088/1674-1137/38/2/026001

Chinese Physics C> 2014, Vol. 38> Issue(2) : 026001 DOI: 10.1088/1674-1137/38/2/026001

Performances and long-term stability of the LHAASO-KM2A prototype array

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Abstract：
A prototype array for the LHAASO-KM2A, which consists of 42 detector units and fully overlaps the ARGO-YBJ experiment, was set up at the Yangbajing cosmic ray observatory and has been in stable operation since Octoter 2010. The resulting performances of the KM2A electromagnetic particle detector prototypes fully meet the design requirements. Through hybrid observation of cosmic ray showers with the ARGO-YBJ experiment, the performances and long-term stability of the prototype array are tested and the results are consistent with expectation. The cosmic ray moon shadow observed by the prototype array is also presented.

References

[1]

CAO Zhen. Chinese Physics C (HEP NP), 2010, 34(2): 4, 249-252[2] HE Hai-Hui et al. (LHAASO collaboration). ICRC2009, Poland[3] SHENG Xiang-Dong et al. (LHAASO collaboration). ICRC2011, China[4] XIAO Gang et al. (LHAASO collaboration). ICRC2011, China[5] Aielli G et al. Nuclear Insrtuments and Methods A, 2006, 562: 92[6] GU Min-Hao et al. (LHAASO collaboration). ICRC2011, China[7] MA Xin-Hua et al. (LHAASO collaboration). ICRC2011, China[8] Bartoli B et al. The Astrophysical Journal, 2011, 734: 110 (8pp)

[1]	Zhen Cao , F. Aharonian , Q. An , , Y.X. Bai , Y.W. Bao , D. Bastieri , X.J. Bi , Y.J. Bi , J.T. Cai , Q. Cao , W.Y. Cao , Zhe Cao , J. Chang , J.F. Chang , A.M. Chen , E.S. Chen , Liang Chen , Lin Chen , Long Chen , M.J. Chen , M.L. Chen , Q.H. Chen , S.H. Chen , T.L. Chen , Y. Chen , N. Cheng , Y.D. Cheng , M.Y. Cui , S.W. Cui , X.H. Cui , Y.D. Cui , B.Z. Dai , H.L. Dai , Z.G. Dai , , D. della Volpe , X.Q. Dong , K.K. Duan , J.H. Fan , Y.Z. Fan , J. Fang , K. Fang , C.F. Feng , L. Feng , S.H. Feng , X.T. Feng , Y.L. Feng , S. Gabici , B. Gao , C.D. Gao , L.Q. Gao , Q. Gao , W. Gao , W.K. Gao , M.M. Ge , L.S. Geng , G. Giacinti , G.H. Gong , Q.B. Gou , M.H. Gu , F.L. Guo , X.L. Guo , Y.Q. Guo , Y.Y. Guo , Y.A. Han , H.H. He , H.N. He , J.Y. He , X.B. He , Y. He , M. Heller , Y.K. Hor , B.W. Hou , C. Hou , X. Hou , H.B. Hu , Q. Hu , S.C. Hu , D.H. Huang , T.Q. Huang , W.J. Huang , X.T. Huang , X.Y. Huang , Y. Huang , Z.C. Huang , X.L. Ji , H.Y. Jia , K. Jia , K. Jiang , X.W. Jiang , Z.J. Jiang , M. Jin , M.M. Kang , T. Ke , D. Kuleshov , K. Kurinov , B.B. Li , Cheng Li , Cong Li , D. Li , F. Li , H.B. Li , H.C. Li , H.Y. Li , J. Li , Jian Li , Jie Li , K. Li , W.L. Li , W.L. Li , X.R. Li , Xin Li , Y.Z. Li , Zhe Li , Zhuo Li , E.W. Liang , Y.F. Liang , S.J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H.D. Liu , J. Liu , J.L. Liu , J.Y. Liu , M.Y. Liu , R.Y. Liu , S.M. Liu , W. Liu , Y. Liu , Y.N. Liu , R. Lu , Q. Luo , H.K. Lv , B.Q. Ma , L.L. Ma , X.H. Ma , J.R. Mao , Z. Min , W. Mitthumsiri , H.J. Mu , Y.C. Nan , A. Neronov , Z.W. Ou , B.Y. Pang , P. Pattarakijwanich , Z.Y. Pei , M.Y. Qi , Y.Q. Qi , B.Q. Qiao , J.J. Qin , D. Ruffolo , A. Sáiz , D. Semikoz , C.Y. Shao , L. Shao , O. Shchegolev , X.D. Sheng , F.W. Shu , H.C. Song , Yu.V. Stenkin , V. Stepanov , Y. Su , Q.N. Sun , X.N. Sun , Z.B. Sun , P.H.T. Tam , Q.W. Tang , Z.B. Tang , W.W. Tian , C. Wang , C.B. Wang , G.W. Wang , H.G. Wang , H.H. Wang , J.C. Wang , K. Wang , L.P. Wang , L.Y. Wang , P.H. Wang , R. Wang , W. Wang , X.G. Wang , X.Y. Wang , Y. Wang , Y.D. Wang , Y.J. Wang , Z.H. Wang , Z.X. Wang , Zhen Wang , Zheng Wang , D.M. Wei , J.J. Wei , Y.J. Wei , T. Wen , C.Y. Wu , H.R. Wu , S. Wu , X.F. Wu , Y.S. Wu , S.Q. Xi , J. Xia , J.J. Xia , G.M. Xiang , D.X. Xiao , G. Xiao , G.G. Xin , Y.L. Xin , Y. Xing , Z. Xiong , D.L. Xu , R.F. Xu , R.X. Xu , W.L. Xu , L. Xue , D.H. Yan , J.Z. Yan , T. Yan , C.W. Yang , F. Yang , F.F. Yang , H.W. Yang , J.Y. Yang , L.L. Yang , M.J. Yang , R.Z. Yang , S.B. Yang , Y.H. Yao , Z.G. Yao , Y.M. Ye , L.Q. Yin , N. Yin , X.H. You , Z.Y. You , Y.H. Yu , Q. Yuan , H. Yue , H.D. Zeng , T.X. Zeng , W. Zeng , M. Zha , B.B. Zhang , F. Zhang , H.M. Zhang , H.Y. Zhang , J.L. Zhang , L.X. Zhang , Li Zhang , P.F. Zhang , P.P. Zhang , R. Zhang , S.B. Zhang , S.R. Zhang , S.S. Zhang , X. Zhang , X.P. Zhang , Y.F. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L.Z. Zhao , S.P. Zhao , F. Zheng , B. Zhou , H. Zhou , J.N. Zhou , M. Zhou , P. Zhou , R. Zhou , X.X. Zhou , C.G. Zhu , F.R. Zhu , H. Zhu , K.J. Zhu , X. Zuo , (LHAASO Collaboration) . Optimization of performance of the KM2A full array using the Crab Nebula. Chinese Physics C, 2024, 48(6): 065001. doi: 10.1088/1674-1137/ad2e82
[2]	F. Aharonian , Q. An , Axikegu , L.X. Bai , Y.X. Bai , Y.W. Bao , D. Bastieri , X.J. Bi , Y.J. Bi , J.T. Cai , Zhe Cao , Zhen Cao , J. Chang , J.F. Chang , E.S. Chen , Liang Chen , Liang Chen , Long Chen , M.J. Chen , M.L. Chen , S.H. Chen , S.Z. Chen , T.L. Chen , X. J. Chen , Y. Chen , H.L. Cheng , N. Cheng , Y.D. Cheng , S.W. Cui , X.H. Cui , Y.D. Cui , B.Z. Dai , H.L. Dai , Z.G. Dai , Danzengluobu , D. della Volpe , K.K. Duan , J.H. Fan , Y.Z. Fan , Z.X. Fan , J. Fang , K. Fang , C.F. Feng , L. Feng , S.H. Feng , X.T. Feng , Y.L. Feng , B. Gao , C.D. Gao , L.Q. Gao , Q. Gao , W. Gao , W.K. Gao , M.M. Ge , L.S. Geng , G.H. Gong , Q.B. Gou , M.H. Gu , F.L. Guo , J.G. Guo , X.L. Guo , Y.Q. Guo , Y.Y. Guo , Y.A. Han , H.H. He , H.N. He , S.L. He , X.B. He , Y. He , M. Heller , Y.K. Hor , C. Hou , X. Hou , H.B. Hu , Q. Hu , S. Hu , S.C. Hu , X.J. Hu , D.H. Huang , W.H. Huang , X.T. Huang , X.Y. Huang , Y. Huang , Z.C. Huang , X.L. Ji , H.Y. Jia , K. Jia , K. Jiang , Z.J. Jiang , M. Jin , M.M. Kang , T. Ke , D. Kuleshov , B.B. Li , Cheng Li , Cong Li , F. Li , H.B. Li , H.C. Li , H.Y. Li , J. Li , Jian Li , Jie Li , K. Li , W.L. Li , X.R. Li , Xin Li , Xin Li , Y.Z. Li , Zhe Li , Zhuo Li , E.W. Liang , Y.F. Liang , S.J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H.D. Liu , J. Liu , J.L. Liu , J.S. Liu , J.Y. Liu , M.Y. Liu , R.Y. Liu , S.M. Liu , W. Liu , Y. Liu , Y.N. Liu , W.J. Long , R. Lu , Q. Luo , H.K. Lv , B.Q. Ma , L.L. Ma , X.H. Ma , J.R. Mao , A. Masood , Z. Min , W. Mitthumsiri , Y.C. Nan , Z.W. Ou , B.Y. Pang , P. Pattarakijwanich , Z.Y. Pei , M.Y. Qi , Y.Q. Qi , B.Q. Qiao , J.J. Qin , D. Ruffolo , A. Sáiz , C.Y. Shao , L. Shao , O. Shchegolev , X.D. Sheng , J.Y. Shi , H.C. Song , Yu.V. Stenkin , V. Stepanov , Y. Su , Q.N. Sun , X.N. Sun , Z.B. Sun , P.H.T. Tam , Z.B. Tang , W.W. Tian , B.D. Wang , C. Wang , H. Wang , H.G. Wang , J.C. Wang , J.S. Wang , L.P. Wang , L.Y. Wang , R. Wang , R.N. Wang , W. Wang , X.G. Wang , X.Y. Wang , Y. Wang , Y.D. Wang , Y.J. Wang , Y.P. Wang , Z.H. Wang , Z.X. Wang , Zhen Wang , Zheng Wang , D.M. Wei , J.J. Wei , Y.J. Wei , T. Wen , C.Y. Wu , H.R. Wu , S. Wu , X.F. Wu , Y.S. Wu , S.Q. Xi , J. Xia , J.J. Xia , G.M. Xiang , D.X. Xiao , G. Xiao , G.G. Xin , Y.L. Xin , Y. Xing , Z. Xiong , D.L. Xu , R.X. Xu , L. Xue , D.H. Yan , J.Z. Yan , C.W. Yang , F.F. Yang , H.W. Yang , J.Y. Yang , L.L. Yang , M.J. Yang , R.Z. Yang , S.B. Yang , Y.H. Yao , Z.G. Yao , Y.M. Ye , L.Q. Yin , N. Yin , X.H. You , Z.Y. You , Y.H. Yu , Q. Yuan , H. Yue , H.D. Zeng , T.X. Zeng , W. Zeng , Z.K. Zeng , M. Zha , X.X. Zhai , B.B. Zhang , F. Zhang , H.M. Zhang , H.Y. Zhang , J.L. Zhang , L.X. Zhang , Li Zhang , Lu Zhang , P.F. Zhang , P.P. Zhang , R. Zhang , S.B. Zhang , S.R. Zhang , S.S. Zhang , X. Zhang , X.P. Zhang , Y.F. Zhang , Y.L. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L.Z. Zhao , S.P. Zhao , F. Zheng , Y. Zheng , B. Zhou , H. Zhou , J.N. Zhou , P. Zhou , R. Zhou , X.X. Zhou , C.G. Zhu , F.R. Zhu , H. Zhu , K.J. Zhu , X. Zuo , (LHAASO Collaboration) . Flux variations of cosmic ray air showers detected by LHAASO-KM2A during a thunderstorm on June 10, 2021. Chinese Physics C, 2023, 47(1): 015001. doi: 10.1088/1674-1137/ac9371
[3]	F. Aharonian , Q. An , , L. X. Bai , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , H. Cai , J. T. Cai , Z. Cao , Z. Cao , J. Chang , J. F. Chang , X. C. Chang , B. M. Chen , J. Chen , L. Chen , L. Chen , L. Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. L. Chen , Y. Chen , N. Cheng , Y. D. Cheng , S. W. Cui , X. H. Cui , Y. D. Cui , B. Z. Dai , H. L. Dai , Z. G. Dai , , D. della Volpe , B. D'Ettorre Piazzoli , X. J. Dong , J. H. Fan , Y. Z. Fan , Z. X. Fan , J. Fang , K. Fang , C. F. Feng , L. Feng , S. H. Feng , Y. L. Feng , B. Gao , C. D. Gao , Q. Gao , W. Gao , M. M. Ge , L. S. Geng , G. H. Gong , Q. B. Gou , M. H. Gu , J. G. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , H. H. He , H. N. He , J. C. He , S. L. He , X. B. He , Y. He , M. Heller , Y. K. Hor , C. Hou , X. Hou , H. B. Hu , S. Hu , S. C. Hu , X. J. Hu , D. H. Huang , Q. L. Huang , W. H. Huang , X. T. Huang , Z. C. Huang , F. Ji , X. L. Ji , H. Y. Jia , K. Jiang , Z. J. Jiang , C. Jin , D. Kuleshov , K. Levochkin , B. B. Li , C. Li , C. Li , F. Li , H. B. Li , H. C. Li , H. Y. Li , J. Li , K. Li , W. L. Li , X. Li , X. Li , X. R. Li , Y. Li , Y. Z. Li , Z. Li , Z. Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. S. Liu , J. Y. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. N. Liu , Z. X. Liu , W. J. Long , R. Lu , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , A. Masood , W. Mitthumsiri , T. Montaruli , Y. C. Nan , B. Y. Pang , P. Pattarakijwanich , Z. Y. Pei , M. Y. Qi , D. Ruffolo , V. Rulev , A. Sáiz , L. Shao , O. Shchegolev , X. D. Sheng , J. R. Shi , H. C. Song , Yu. V. Stenkin , V. Stepanov , Q. N. Sun , X. N. Sun , Z. B. Sun , P. H. T. Tam , Z. B. Tang , W. W. Tian , B. D. Wang , C. Wang , H. Wang , H. G. Wang , J. C. Wang , J. S. Wang , L. P. Wang , L. Y. Wang , R. N. Wang , W. Wang , W. Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. D. Wang , Y. J. Wang , Y. P. Wang , Z. Wang , Z. Wang , Z. H. Wang , Z. X. Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , S. Wu , W. X. Wu , X. F. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , G. Xiao , H. B. Xiao , G. G. Xin , Y. L. Xin , Y. Xing , D. L. Xu , R. X. Xu , L. Xue , D. H. Yan , C. W. Yang , F. F. Yang , J. Y. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , S. B. Yang , Y. H. Yao , Z. G. Yao , Y. M. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. D. Zeng , T. X. Zeng , W. Zeng , Z. K. Zeng , M. Zha , X. X. Zhai , B. B. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. W. Zhang , L. Zhang , L. Zhang , L. X. Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. Zhang , Y. Zhang , Y. F. Zhang , Y. L. Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , F. Zheng , Y. Zheng , B. Zhou , H. Zhou , J. N. Zhou , P. Zhou , R. Zhou , X. X. Zhou , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , X. Zuo , (LHAASO Collaboration) . Observation of the Crab Nebula with LHAASO-KM2A − a performance study. Chinese Physics C, 2021, 45(2): 025002. doi: 10.1088/1674-1137/abd01b
[4]	Chao Jin , Song-zhan Chen , Hui-hai He , (for the LHAASO Collaboration) . Classifying cosmic-ray proton and light groups in LHAASO-KM2A experiment with graph neural network. Chinese Physics C, 2020, 44(6): 065002. doi: 10.1088/1674-1137/44/6/065002
[5]	Cong Ma , Lei Zhao , Yu-Xiang Guo , Jian-Feng Liu , Shu-Bin Liu , Qi An . Analog front-end prototype electronics for the LHAASO WCDA. Chinese Physics C, 2016, 40(1): 016101. doi: 10.1088/1674-1137/40/1/016101
[6]	Xu Wang , Zhong-Quan Zhang , Ye Tian , Yan-Yan Du , Xiao Zhao , Fu-Wang Shen , Chang-Yu Li , Yan-Sheng Sun , Cun-Feng Feng . Setup of a photomultiplier tube test bench for LHAASO-KM2A. Chinese Physics C, 2016, 40(8): 086003. doi: 10.1088/1674-1137/40/8/086003
[7]	Xiang Liu , Jing-Fan Chang , Zheng Wang , Lei Fan . Prototype of readout electronics for the LHAASO KM2A electromagnetic particle detectors. Chinese Physics C, 2016, 40(7): 076101. doi: 10.1088/1674-1137/40/7/076101
[8]	ZHAO Lei , LIU Shu-Bin , AN Qi . Proposal of the readout electronics for the WCDA in the LHAASO experiment. Chinese Physics C, 2014, 38(1): 016101. doi: 10.1088/1674-1137/38/1/016101
[9]	LI Hui-Cai , CHEN Ming-Jun , JIA Huan-Yu , GAO Bo , YAO Zhi-Guo , YUO Xiao-Hao , ZHOU Bin , ZHU Feng-Rong , . Study on the optimization of the water Cherenkov detector array of the LHAASO project for surveying VHE gamma ray sources. Chinese Physics C, 2014, 38(1): 016002. doi: 10.1088/1674-1137/38/1/016002
[10]	YI Han , ZHANG Zhao , XIAO Zhi-Gang , CHENG Wen-Jing , YAN Wei-Hua , WANG Ren-Sheng , LI Hong-Jie , HUANG Yan , ZHANG Yan , DUAN Li-Min , HU Rong-Jiang , LU Chen-Gui , YANG He-Run , MA Peng , . Prototype studies on the forward MWDC tracking array of theexternal target experiment at HIRFL-CSR. Chinese Physics C, 2014, 38(12): 126002. doi: 10.1088/1674-1137/38/12/126002
[11]	GAO Bo , CHEN Ming-Jun , GU Min-Hao , HAO Xin-Jun , LI Hui-Cai , WU Han-Rong , YAO Zhi-Guo , YOU Xiao-Hao , ZHOU Bin . Online charge calibration of LHAASO-WCDA-a study with the engineering array. Chinese Physics C, 2014, 38(2): 026003. doi: 10.1088/1674-1137/38/2/026003
[12]	XU Tong-Ye , DU Yan-Yan , WANG Xu , SHAO Ruo-Bin , ZHANG Deng-Feng , ZHU Cheng-Guang . Test of the LHAASO electron detector prototype using cosmic rays. Chinese Physics C, 2014, 38(11): 116004. doi: 10.1088/1674-1137/38/11/116004
[13]	ZHAO Jing , LIU Jia , SHENG Xiang-Dong , HE Hui-Hai , GUO Yi-Qing , HOU Chao , LÜ Hong-Kui . Design and performances of electromagnetic particle detector for LHAASO-KM2A. Chinese Physics C, 2014, 38(3): 036002. doi: 10.1088/1674-1137/38/3/036002
[14]	JIANG Wei-Zhou . Rearrangement term with relativistic density-dependenthyperon potentials. Chinese Physics C, 2013, 37(6): 064101. doi: 10.1088/1674-1137/37/6/064101
[15]	LIU Bo , LIU Ran , LI Quan-Jun , YAO Ming-Guang , ZOU Bo , CUI Tian , LIU Bing-Bing , LIU Jing . Study of high pressure structural stability of CeO₂ nanoparticles. Chinese Physics C, 2013, 37(9): 098003. doi: 10.1088/1674-1137/37/9/098003
[16]	TANG Liang , LI Xue-Qian . Discussions on the stability of diquarks. Chinese Physics C, 2012, 36(7): 578-584. doi: 10.1088/1674-1137/36/7/002
[17]	GE Yong-Shuai , WANG Zhi-Gang , YU Bo-Xiang , XIE Yu-Guang , ZHANG Ai-Wu , XUE Zhen , LIU Ying-Biao , GAO Long , NIU Shun-Li , CAI Xiao , FANG Jian , SUN Xi-Lei , NING Fei-Peng , ZHOU Li , HU Tao , , . A novel 2-dimensional cosmic ray position detector based on a CsI(Na) pixel array and an ICCD camera. Chinese Physics C, 2012, 36(11): 1101-1105. doi: 10.1088/1674-1137/36/11/011
[18]	YU Bo-Xiang , LIU Hong-Bang , XIE Yi-Gang , ZHANG Ai-Wu , TANG Ai-Song , YANG Ya-Dan , DONG Yang , LI Min , WANG Zhi-Gang , XIE Yu-Guang , CAI Xiao , ZHOU Li , HU Tao , . Performances of RETGEM with resistive electrodes made of kapton foils. Chinese Physics C, 2011, 35(12): 1120-1123. doi: 10.1088/1674-1137/35/12/007
[19]	LIU Xiang . Derivation of a 1/r² potential term for QQ in a potential model. Chinese Physics C, 2010, 34(9): 1482-1484. doi: 10.1088/1674-1137/34/9/078
[20]	Gao Xiaochun , Xu Donghui . Removability of the Topological Term in the 2+1 Dimensional CP¹ Model. Chinese Physics C, 1995, 19(S3): 257-264.

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LIU Jia, SHENG Xiang-Dong, HE Hui-Hai, ZHAO Jing, CHANG Jin-Fan, GU Min-Hao, HOU Chao and LÜ Hong-Kui. Performances and long-term stability of the LHAASO-KM2A prototype array[J]. Chinese Physics C, 2014, 38(2): 026001. doi: 10.1088/1674-1137/38/2/026001

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Received: 2013-03-21
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Performances and long-term stability of the LHAASO-KM2A prototype array

Corresponding author: LIU Jia,

Received Date: 2013-03-21
Accepted Date: 1900-01-01
Available Online: 2014-02-05

Abstract: A prototype array for the LHAASO-KM2A, which consists of 42 detector units and fully overlaps the ARGO-YBJ experiment, was set up at the Yangbajing cosmic ray observatory and has been in stable operation since Octoter 2010. The resulting performances of the KM2A electromagnetic particle detector prototypes fully meet the design requirements. Through hybrid observation of cosmic ray showers with the ARGO-YBJ experiment, the performances and long-term stability of the prototype array are tested and the results are consistent with expectation. The cosmic ray moon shadow observed by the prototype array is also presented.