Optic detectors calibration for measuring ultra-high energy extensive air showers Cherenkov radiation by 532 nm laser

Stanislav Knurenko,Igor Petrov,Yuri Egorov

doi:10.1088/1742-6596/632/1/012099

Abstract

Calibration of a PMT matrix is crucial for the treatment of the data obtained with Cherenkov tracking detector. Furthermore, due to high variability of the aerosol abundance in the atmosphere depending on season, weather etc. A constant monitoring of the atmospheric transparency is required during the measurements. For this purpose, besides traditional methods, a station for laser atmospheric probing is used.

Highlights

At the Yakutsk array, atmosphere laser sensing station is deployed
Profile measurements of the transmission function of the atmosphere conducted in the area of Yakutsk array showed that in periods of observation implemented a number of scenarios of atmospheric conditions, from Rayleigh scattering, when practically note the clear atmosphere (Fig. 4), to almost full or partial absorption of laser radiation in a thick continuous layer of clouds or to separate layers, as shown in the Figure 5
Since the spectral characteristics of Cherenkov detectors is within wavelength range

Summary

INTRODUCTION

At the Yakutsk array, atmosphere laser sensing station is deployed. Laser radiation of remote atmosphere sensing attenuates when passing through molecules of gases and aerosols of the atmosphere. Part of radiation scatters off aerosols particles and falls through a narrow gap on tiled PMT. At Yakutsk array, measurement of Cherenkov radiation characteristics carried out by large number of integral and track detectors [4]. Each PMT of track detector registers Cherenkov photons throughout dense part of the atmosphere. Such detector can trace the entire longitudinal development of the shower particles and allows us to study the physics of the process. Since these measurements are precise nature, the accuracy of the cascade curve is crucial for this technique, LIDAR data can significantly improve the accuracy of the experiment

WEATHER CONDITION REQUIREMENTS FOR CHERENKOV

CALIBRATION ALGORITHM CHERENKOV DETECTORS USING LASER

METHOD OF CALIBRATION AND MEASUREMENTS TESTING OF EAS

CONCLUSION