Current Particle Detector Arrays in Gamma-Ray Astronomy

LHAASO, which was fully completed and started taking data in July 2021, is currently the most sensitive particle detector array. It has high sensitivity to measure both the very high-energy and ultra-high-energy gamma rays. In particular, the sensitivity for ultra-high-energy gamma rays is more than ten times better than all previous experiments. Recently, a breakthrough has been made in ultra-high-energy gamma-ray observations. Twelve ultra-high-energy gamma-ray sources accompanied by several PeV photons were detected. ARGO-YBJ and Tibet ASγ, the predecessors of LHAASO, are also famous gamma-ray particle detector arrays. They have made important contributions in the observations of very high-energy gamma rays, which are important stages in the development of particle detector arrays. The development history of Tibet ASγ, ARGO-YBJ, and LHAASO, as well as their achievements in gamma-ray astronomy, will be introduced in this chapter.