A charge calibration method for the LHAASO-WCDA dynamic range expansion system
2019 July 22
The LHAASO-WCDA dynamic range expansion system (WCDA++) is designed as an important link between WCDA and WFCTA. It is used to transfer energy scale, and measure precisely the shower core of events, which is an important parameter to identify the composition of the primary particles, at the energy range from 1 TeV to 10 PeV. The photomultiplier tubes (PMT) used in WCDA++ are operated at a gain of about 2×10^5. In order to calibrate the working states of these PMTs, we had developed a dynamic calibration system, based on a network consisting of LEDs and optical fibers. At the beginning of 2019, this system has been installed and related testing is underway.