Characterization of the front-end EASIROC for read-out of SiPM in the ASTRI camera

TL;DR

This paper evaluates the performance of the EASIROC chip for reading out SiPM sensors in the ASTRI telescope camera, focusing on trigger capabilities, timing, linearity, and dynamic range to support Cherenkov light detection.

Contribution

It provides preliminary characterization results of the EASIROC ASIC for SiPM read-out in Cherenkov telescope applications, highlighting its suitability for the ASTRI camera.

Findings

EASIROC demonstrates effective autotriggering capabilities.

Trigger time walk and jitter are within acceptable ranges.

The ASIC's dynamic range is suitable for the application.

Abstract

The design and realization of a prototype for the Small-Size class Telescopes of the Cherenkov Telescope Array is one of the cornerstones of the ASTRI project. The prototype will adopt a focal plane camera based on Silicon Photo-Multiplier sensors that coupled with a dual mirror optics configuration represents an innovative solution for the detection of Atmospheric Cherenkov light. These detectors can be read by the Extended Analogue Silicon Photo-Multiplier Integrated Read Out Chip (EASIROC) equipped with 32-channels. In this paper, we report some preliminary results on measurements aimed to evaluate EASIROC capability of autotriggering and measurements of the trigger time walk, jitter, DAC linearity and trigger efficiency vs the injected charge. Moreover, the dynamic range of the ASIC is also reported.