Testbeam performance of a shashlik calorimeter with fine-grained longitudinal segmentation

TL;DR

This paper reports on the testing of a finely segmented shashlik calorimeter at CERN, demonstrating its effective performance for neutrino physics applications through measurements of energy resolution, linearity, and shower response.

Contribution

It introduces a novel compact fiber-SiPM readout system for shashlik calorimeters with fine longitudinal segmentation, suitable for neutrino experiments.

Findings

Achieved good electron energy resolution and linearity

Validated detector response to muons and hadron showers

Demonstrated the system's suitability for neutrino physics applications

Abstract

An iron- plastic-scintillator shashlik calorimeter with a 4.3 $X_0$ longitudinal segmentation was tested in November 2016 at the CERN East Area facility with charged particles up to 5 GeV. The performance of this detector in terms of electron energy resolution, linearity, response to muons and hadron showers are presented in this paper and compared with simulation. Such a fine-grained longitudinal segmentation is achieved using a very compact light readout system developed by the SCENTT and ENUBET Collaborations, which is based on fiber-SiPM coupling boards embedded in the bulk of the detector. We demonstrate that this system fulfills the requirements for neutrino physics applications and discuss performance and additional improvements.