Speaker
Dr
Jinyan Liu
(IHEP)
Description
The Large High Altitude Air Shower Observatory (LHAASO) is a multi-component experiment to study cosmic ray physics, which is under construction near Mt. Haizishan (4410 m a.s.l.) in Southwest China. The 78,000 m$^2$ Water Cherenkov Detector Array (WCDA), which is one of the main components of the LHAASO, will be able to survey the gamma-ray sky continuously in the energy range from 100 GeV to PeV. The precision of time measurement in the detector cells of WCDA determines the sensitivity to gamma ray sources, necessitating a hardware calibration system to be deployed in the WCDA. Effects such as environment temperature variations will introduce time offsets between detector cells. In order to calibrate the time offset, a technique using high statistics low energy cosmic rays has been developed. This contribution describes the technique and demonstrates that the performance meets the requirements. The high statistics of low energy cosmic rays makes it possible to calibrate the detector in real time. The performance for 1st water pool is also presented.
Primary author
Dr
Jinyan Liu
(IHEP)
Co-authors
Dr
Min Zha
(高能所)
Zhiguo Yao
(高能所)
