Abstract:

The Large High Altitude Air Shower Observatory (LHAASO) as the largest ground based Gamma Ray detector array is under construction. The first 1/2 array with the coverage of 1/2 km2 has been put in operation for science. It has an array of 2514 scintillator counters and 594 muon detectors in the array nearby a Water Cherenkov Detector with an active area of 45000 m2. The construction of the entire array will be concluded in next year. Finding the galactic Cosmic Ray (CR) origin has been set as the goal of the mega project, by surveying for the gamma ray sources and precisely measuring the gamma ray spectra of them up to 1 PeV. Many related scientific questions can be addressed with the experiment using LHAASO. Preliminary results of the analysis of data taken by the first quarter of array and expectations are presented.

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