Speaker
Description
The Wide Field of View Cherenkov Telescope Array (WFCTA) of Large High Altitude Air Shower Observatory(LHAASO) is designed to measure the extensive air showers created by cosmic rays from ~30 TeV to several EeV. In order to employ an end-to-end calibration method for WFCTA, four laser lidar systems have been developed successfully and installed at the LHAASO. Two N2 lasers with the 337.1 nm wavelength have been operating continuously since October 2019 and a YAG laser with wavelength of 355 nm, has been running since December 2020. In this presentation, the performance of the N2 and YAG lasers at the an altitude of 4410 m are introduced in detail. Great cares were taken to select the laser events data observed by telescopes at clear nights for our analyses with the help of infrared cloud instrument on-site. After excluding the inconsistency of all SiPMs of telescope, we are able to obtain the calibration gains or the detection efficiency for each telescope by matching the observed light flux with the expected one at the entrance of the telescope. Furthermore, we will discuss the systematic uncertainties for the calibration of WFCTA.
| Subcategory | Experimental Methods & Instrumentation |
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