Study on the Impact of Cross-Talk in the ATLAS Electromagnetic Calorimeter on the Signal Prediction in the Strip Layer

The Liquid Argon (LAr) Calorimeters play a central role in the ATLAS detector at the LHC. They measure electrons and photons with high resolution and detect hadronic jets and missing energy signatures. This thesis is dedicated to study the electronic calibration of the electromagnetic barrel calorimeter, which is a lead-liquid argon sampling calorimeter. ATLAS LAr calorimeters have a special electronic calibration system that injects and measures well known current pulses on the detector cells. This procedure leads to well predicted and calibrated pulses of physics signals. The effect of capacitive cross-talk between the front compartment (strips) of the LAr calorimeter is considerably high, the strip-strip peak to peak capacitive cross-talk is about 7.2 % and 0.81 % for 1st neighbor strip and 2nd neighbor strip, respectively [29]. A mathematical model which expresses the effects of the capacitive cross-talk is derived. The effect of capacitive cross-talk on the pulse prediction is analyzed. The relative change in the energy content of a single cell, (ΔE/E), is found to be around 0.3 % for a 10% relative cross-talk capacitance.