Abstract
As one of the important parts of the LHAASO Project, the Water Cherenkov Detector Array (WCDA) is planned to be built in Yangbajing, Tibet, China soon. In order to fully understand the engineering issues and the basic performance of the water Cherenkov detection technique, a prototype water Cherenkov detector has been built and operat- ed in Beijing, and an engineering array has been constructed on site. With the help of the prototype detector, performance related to cosmic muon signals and water quality maintenance has been studied and acquired. Studies of the engineering array are also progressing smoothly: nine 8-in PMTs and their electronics and DAQ systems have been deployed; an optical calibration system, a water recycling and purification system, and a slow control system, have been installed; the data taking started, and the data analysis is going on. These studies will offer a great help to the future work of the full array.
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