Speaker
Description
The Wide Field-of-view Cherenkov Telescope Array (WFCTA) at the Large High Altitude Air Shower Observatory (LHAASO) detects cosmic-ray-induced air showers by measuring Cherenkov light produced by secondary particles in the atmosphere. Precise reconstruction of primary cosmic-ray properties necessitates rigorous calibration of atmospheric attenuation effects and telescope response. This study presents an integrated calibration system deployed at the LHAASO site, comprising four fixed laser calibration stations, a 20-meter meteorological tower, and a sun photometer: 1) The meteorological tower provides real-time atmospheric densityderived from temperature and humidity measurements; 2) The sun photometer acquires daytime vertical aerosol optical depth; 3) A novel laser calibration system employs a multi-angle scanning strategy, utilizing adjustable azimuth (0–360°) and elevation (0–90°) to systematically scan the WFCTA’s full field-of-view (14°×16°). Results demonstrate that this synergistic approach effectively decouples atmospheric attenuation from detector response, ensuring reliable energy reconstruction for TeV–PeV cosmic rays. This work establishes a benchmark for atmospheric and instrumental calibration in ground-based cosmic-ray observatories.
| Collaboration(s) | LHAASO |
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