R&D for a highly granular silicon tungsten electromagnetic calorimeter

Roman Pöschl,The Calice Collaboration

doi:10.1088/1742-6596/587/1/012032

Abstract

This article reports on first experience with the technological prototype of a highly- granular silicon-tungsten electromagnetic calorimeter as envisaged for the detectors at a future lepton collider. In the focus of the analysis is the performance of a highly integrated Application Specific Integrated Circuit designed to meet the requirements in terms of dynamic range, compactness and power consumption. The beam test results show that the circuit will allow a future detector with a signal over noise ratio of at least 10:1. To minimise the power dissipation the ASIC will be operated in a power pulsed mode. So far no conceptual problem was revealed but the studies show the way for further work. The prototype is read out by a DAQ system conceived to meet the needs of a trigger less system with a huge number of readout cells.

Highlights

The major worldwide project in high energy particle physics will be a linear electron positron collider at the TeV scale to complement and extend the scientific results of the LHC
Empty events occur if the same signal triggers a readout in two consecutive bunch crossing due to an non-optimal timing of the ASICs w.r.t. the arrival of particles
Calibration of detector modules The ASIC SKIROC2 [13] is operated in auto-trigger mode

Summary

Introduction

Each of the ASICs reads 64 calorimeter cells and realise the measuring of the analogue signal, the digitisation and the zero suppression such that only a limited number of channels are sent to the data acquisition. This time structure of the ILC beam allows to operate the ASIC in power pulsed mode.

Results

Conclusion