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Current Status of ECAL and HCAL Simulation: Insights and Developments

This document outlines the progress and intricacies involved in the simulation and digitization of the ECAL and HCAL systems. It highlights the reliance on GEANT4 for energy deposit simulations, emphasizes the importance of geometry modeling, and details the digitization process, including pulse shape, noise, and zero suppression. Various contributors discuss calibration techniques, such as gain switching and the correlation matrix used for noise simulation. The document also covers validation through experimental hits and future strategies for refining geometry to improve the accuracy of simulations.

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Current Status of ECAL and HCAL Simulation: Insights and Developments

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  1. ECAL and HCAL Simulation Status Rick Wilkinson Fabio Cossutti

  2. Simulation • Sim Hit: One ns of energy deposit in an active volume • Done by GEANT4 (Sunanda Banerjee) • Depends strongly on geometry modeling • ECAL (Paolo Meridiani) • HCAL (Jeremy Mans)

  3. Digitization • Digitization includes: pulse shape, pileup, amplification, noise, ADC encoding, trig prims, zero suppression • CMSSW Digitization has details not in ORCA • Common framework for all systems (Wilkinson) • ECAL (Cossutti, P. Govoni, Wilkinson) • HCAL (Fedor Ratnikov, Wilkinson) • Preshower (Chia-Ming Kuo)

  4. Digitization using Calibration? • Allows added realism • Make hot channels hot, noisy channels noisy • Allows blind test of calibration techniques • Simulate the data with one set of constants • Use derived calibration for reconstruction

  5. Noises

  6. Photostatistics

  7. ECAL Digitization: Details(Fabio Cossutti) • Gain Switching (including hysteresis) • Calibration Interface (Shahram Rahatlou) • No database access yet, just interface • Uses gain ratios, pedestals, & widths • Correlated Noise • Implemented with a global correlation matrix • Currently a unit matrix

  8. HCAL Digitization: Details • Layer 0: Weighting done by GEANT4 (Banerjee) • Calibration Interface (FedorRatnikov) • Fetch pedestals, gains, & noise • For each of four capacitors in channel • Time Slew (JeremyMans) • Small signals delayed by ~10 ns • Correlated Noise • Effect is big in HCAL (Michal Szleper) • Not simulated, but infrastructure exists

  9. Trig Prims • ECAL Trig Prims (Ursula Berthon) • HCAL Trig Prims (Jeremy Mans)

  10. Zero Suppression • ECAL Selective Readout (Philippe Gras) • Trig prim > 5 GeV: read all 25x25 crystals • Trig prim > 2.5 GeV: read 5x5 crystals • Otherwise • 90 MeV threshold in barrel • 450 MeV in endcap • HCAL Zero Suppression (Jeremy Mans) • Pedestal-subtracted amplitudes • Can store both suppressed & unsuppressed digis

  11. Validation ECAL • Hits (Xingtao Huang) • Digis (F.Cossutti) • RecHits (ChiaraRovelli) • 30 GeV photons • 400 GeV photons • 60 GeV pions • Neutrinos (for noise) • HCAL • Hits (Salavat Abdullin) • Digis (Dmitri Konstantinov) • 100 GeV Pions

  12. ECAL Simulation Plans • New Geometry (Brian Heltsley) • Handles material behind the crystals better • Important for HCAL • Study shower shape • ~1% discrepancy, maybe Cerenkov • Energy deposit inside APD

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