Simulation-Rooted Assessment of Electromagnetic Calorimeters Based on Silicon Sensors

Area of Science:

• High-energy physics instrumentation
• Particle detector simulation
• Electromagnetic calorimetry

Background:

• Precise measurement of positrons and electrons is vital for the LUXE experiment.
• An electromagnetic sampling calorimeter (ECAL) is designed for this purpose.
• Understanding detector response is key for accurate physics analysis.

Purpose of the Study:

• To perform a Geant4-based simulation study of the proposed LUXE ECAL.
• To evaluate the ECAL's electromagnetic shower response, energy resolution, and linearity.
• To validate the simulation model against existing data and literature.

Main Methods:

• Developed a Geant4 simulation model of a Si-W sampling calorimeter with segmented pads.
• Simulated electron beams with energies ranging from 2 to 18 GeV.
• Analyzed simulated data to characterize electromagnetic shower reconstruction and detector performance.

Main Results:

• The Geant4 simulation accurately reproduces literature data and test beam signal distributions.
• Achieved stochastic energy resolution comparable to state-of-the-art Si-W calorimeters.
• Demonstrated good linearity and electromagnetic shower response characteristics.

Conclusions:

• The Geant4 simulation model is a reliable tool for ECAL design and performance prediction.
• The simulated ECAL design shows promising performance for precise particle measurements.
• Further validation confirms the accuracy of the simulation approach for detector optimization.