Energy Escaping Study in GRAiNITA Electromagnetic Calorimeter

Study by Denys Klekots focuses on analyzing energy escaping from the GRAiNITA electromagnetic calorimeter, using Geant4 simulations to investigate energy deposition, escaped energy fluctuations, and non-uniformity in the ECAL setup. The research delves into the impact of leakage and non-uniformity on energy accuracy, proposing simulation-based solutions to optimize detector performance.

• Energy Escaping Study
• GRAiNITA
• Electromagnetic Calorimeter
• Geant4 Simulation
• Energy Deposition

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1. Study of the energy escaping from the GRAiNITA electromagnetic calorimeter. Denys Klekots (Taras Shevchenko National University of Kyiv) denys.klekots@cern.ch denys.klekots@gmail.com 26.08.2024 Denys Klekots denys.klekots@cern.ch #

2. Outline Resolution: constant term simulation Geant4 simulation setup Shower development. Deposited energy Radial analysis of energy deposition Energy of escaped particles Escaped energy fluctuations Escaped energy vs gamma energy point 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 2 26.08.2024

3. Resolution: constant term simulation 2 ? The energy accuracy of ECAL is usually parametrized as usually caused by leakage or non uniformity. We have made a ANR for an ECAL 18cmx18cmx40 cm. : Is it big enough or will there be a y term from leakage Geant4 simulation presentation (material mixture 4.53 ZnWO4 +1.19 heavyliquid (25%water 75% hexasodium tungstate )). Next step if the scan of the small prototype with testbeam muons gives nonuniformity as in LHCb (plot => +-6% Grainita ?) + ?2. Where y is the constant term ? 1) Estimate by simulation our ECAL constant term for this type of nonuniformity. 2) Estimate constant term from light yield vs depth due to WLS absorption 3) Try simulation with fibers in crystal+ liquid mixture Other simulation ideas? Suggestions? Credit to Jacques Lefrancois for this slide 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 3 26.08.2024

4. Geant4 simulation setup Simulation is held in the box volume with dimensions 175 x 175 * 400 mm. Volume is simulated as with one material: 4.53 1.19 ? ??3(partial density) of ZnWO4 ? ??3(partial density) of heavy liquid Projectile particle energy - deposited energy = escaped energy escaped energy The sum of energy of escaped particles 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 4 26.08.2024

5. Shower development. Deposited energy Incoming gamma 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 5 26.08.2024

6. Radial analysis of energy deposition d? = 1 mm Incoming gamma ? 25 GeV 400 mm Most of the energy is deposited near the axis of incoming gamma 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 6 26.08.2024

7. Energy of escaped particles The energy of an escaped particle is: Its mass + kinetic energy if particle was created in pair production. It's kinetic energy otherwise. 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 7 26.08.2024

8. Escaped energy fluctuations The 1000 events were simulated for the gamma quanta of the 25 GeV with an entry point in the axis of the simulated box. The histogram shows the distribution of the escaped energy on event event-wise basis. ? 1 ? ?=1 ?? ?2 ??? = ? = 1000 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 8 26.08.2024

9. Escaped energy vs gamma energy point The figure describes the dependence of the escaped energy on the position of the gamma quanta entry point. The step size is 7 mm. gamma entry position y x 26.08.2024 Denys Klekots denys.klekots@cern.ch Denys Klekots denys.klekots@cern.ch # 9 26.08.2024

10. Thank you for your attention 26.08.2024 Denys Klekots denys.klekots@cern.ch #