Abstract
The Large High Altitude Air Shower Observatory (LHAASO) is a new hybrid array for very high energy gamma ray astronomy and cosmic ray physics. The KM2A array, one of the main parts of LHAASO, covers an area of 1.3 km2 to observe gamma rays above 10 TeV up to 1 PeV for many sources. A prototype with 1% the size of the whole KM2A has been in stable operation for more than two years. A Monte Carlo simulation program named G4KM2A was developed; based on this work, the trigger rate, hit multiplicity, angular and core reconstruction are compared with KM2A prototype data. Finally, the moon shadow with -6.5 significance was obtained. The G4KM2A simulation results are consistent with KM2A prototype data and can be used for the whole KM2A array in future.
Highlights
Very high energy (VHE>30 GeV) gamma-rays, a neutral radiation carrying the information of primary sources without any deflection, play an important role to solve the origin and acceleration mechanism of cosmic rays
The flux of VHE gamma-rays is so low that detectors with large effective area are very essential for high energy gamma-ray observations
The KM2A array consists of 5195 electromagnetic detectors (EDs, 1m2 each) and 1171 muon detectors (MDs, 36m2 each) to detect secondary particles (γ,e±,μ±) in the extensive air shower (EAS) with a full duty cycle, and is dedicated to the observation of gamma-ray sources from 10 TeV to 1 PeV [2, 3]
Summary
Very high energy (VHE>30 GeV) gamma-rays, a neutral radiation carrying the information of primary sources without any deflection, play an important role to solve the origin and acceleration mechanism of cosmic rays. The flux of VHE gamma-rays is so low that detectors with large effective area are very essential for high energy gamma-ray observations. LHAASO is a large scale hybrid extensive air shower (EAS) array for VHE gamma-ray astronomy and cosmic ray physics, and consists of one square kilometer extensive air shower array (KM2A) covering an area about 1.3 km2, 78000 m2 water Cherenkov detector array (WCDA) and 12 wide-filed air Cherenkov/fluorescence telescopes (WFCTA) [1]. The KM2A array consists of 5195 electromagnetic detectors (EDs, 1m2 each) and 1171 muon detectors (MDs, 36m2 each) to detect secondary particles (γ,e±,μ±) in the EAS with a full duty cycle, and is dedicated to the observation of gamma-ray sources from 10 TeV to 1 PeV [2, 3]. The moon shadow with two years observation of prototype was analyzed
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