Overview of the Mini-EUSO $\mu$s trigger logic performance

TL;DR

Mini-EUSO, a UV telescope on the ISS, employs a specialized trigger logic to detect various atmospheric phenomena, including cosmic ray events, elves, and ground flashers, despite its high energy threshold.

Contribution

This paper presents the performance overview of Mini-EUSO's trigger system, highlighting its capability to detect diverse atmospheric events within the constraints of its design.

Findings

Trigger logic successfully detects diverse atmospheric events.

Performance analysis identifies event classes responsible for triggers.

System operates effectively within the constraints of the UV window.

Abstract

Mini-EUSO is the first detector of the JEM-EUSO program deployed on the ISS. It is a wide field of view telescope currently operating from a nadir-facing UV-transparent window on the ISS. It is based on an array of MAPMTs working in photon counting mode with a 2.5 $\mu$s time resolution. Among the different scientific objectives it searches for light signals with time duration compatible to those expected from Extensive Air Showers (EAS) generated by EECRs interacting in the atmosphere. Although the energy threshold for cosmic ray showers is above $E>10^{21}$ eV, due the constraints given by the size of the UV-transparent window, the dedicated trigger logic has been capable of the detection of other interesting classes of events, like elves and ground flashers. An overview of the general performance of the trigger system is provided, with a particular focus on the identification of classes of events responsible for the triggers.