Direct Coupling of SiPMs to Scintillator Tiles for Imaging Calorimetry and Triggering

TL;DR

This paper explores direct coupling of blue-sensitive SiPMs to scintillator tiles for calorimetry and triggering, aiming for compact, high-granularity detectors with optimized geometries and fiberless readout.

Contribution

It develops a scanning setup to optimize scintillator geometries for SiPM readout and demonstrates the feasibility of fiberless coupling for calorimetry and trigger applications.

Findings

Optimized scintillator geometries for SiPM coupling.

Feasibility of fiberless readout in calorimetry.

Initial results on SiPM-coupled trigger tiles.

Abstract

The recent availability of blue sensitive silicon photomultipliers allows the direct readout of blue emitting plastic scintillator tiles without the use of a wavelength shifting fiber. Such directly read out tiles, without light guides, are attractive for the use in highly granular calorimeters that use large numbers of individual cells and in other applications where very compact designs are needed. However, the total signal amplitude and the uniformity of the response can be problematic in such cases. We have developed a scanning setup to investigate the response of scintillator tiles with SiPM readout in detail. It was used to develop optimized scintillator tile geometries for highly granular hadronic calorimetry at future colliders and to investigate the feasibility of a SiPM readout for the trigger of the ATLAS ALFA luminosity detectors. We report on results obtained with specialized scintillator tile geometries, discuss first results obtained with directly coupled SiPM readout of the ATLAS ALFA trigger tiles and introduce the application of fiberless readout in an experiment to study the time structure of hadronic showers.