An Approach to Gamma-Hadron Separation via Measurements of the Middle-UV Fraction of EAS emission by an Imaging Atmospheric Cherenkov Telescope with UV-Sensitive SiPM detectors

TL;DR

This paper models a Cherenkov gamma-ray telescope with UV-sensitive SiPM detectors to measure UV fractions in EAS emission, enhancing gamma-hadron separation efficiency in the 10-100 TeV range.

Contribution

It introduces a novel method using UV fraction measurements with specific filters for improved gamma-hadron separation in Cherenkov telescopes.

Findings

Quality factor up to 5.07 in 10-100 TeV range

Effective gamma-hadron separation based on UV fraction

Modeling results support new UV measurement approach

Abstract

The operation of a small-size Cherenkov gamma-ray telescope TAIGA-IACT with camera on SiPMs OnSemi MicroFJ-60035 has been modelled by multiparticle Monte Carlo (MC) methods. The model implies that telescope camera is equipped with two specific types of filters of 290-590 nm (visible+NUV) and 220-320 nm (MUV+UVB)-bands, each covering half of the camera pixels in some uniform order. This allows one to measure the fraction of UV-radiation in total amount of Cherenkov radiation of an extensive air shower (EAS), that can be used for efficient gamma-hadron separation. The corresponding quality factor takes values up to 5.07 in the 10-100 TeV range depending on the distance to EAS axis and camera orientation.