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Certifying Geant4-based calorimeter simulations for the LCD

Certifying Geant4-based calorimeter simulations for the LCD. Dhiman Chakraborty, Guilherme Lima, Jeremy McCormick, Vishnu Zutshi NICADD, NIU ALCWG-Cal Meeting November 24, 2003. Why comparing Mokka and LCDG4?. Previous LCD studies based on Gismo

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Certifying Geant4-based calorimeter simulations for the LCD

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  1. Certifying Geant4-basedcalorimeter simulationsfor the LCD Dhiman Chakraborty, Guilherme Lima, Jeremy McCormick, Vishnu Zutshi NICADD, NIU ALCWG-Cal Meeting November 24, 2003

  2. Why comparing Mokka and LCDG4? • Previous LCD studies based on Gismo • Geant4-based LCD simulations are rather new, they need to be certified (then Gismo should be dropped) • (LCD)Mokka and LCDG4 were developed independently. Both are based on Geant4, so they should provide compatible results • XML-based geometry representation, like in Gismo

  3. Fair comparison • Geant4 version 5.2 • SDJan03 geometry (cylindrical layers with virtual cells) • Physics list from Mokka • Range cut of 0.1mm • Text output implemented into projective LCDG4 • Same events are processed in both detector simulators (single particles: 50 GeV e, μ, π) input from binary stdhep file: θ = 90°, flat in φ • Same materials in sub-detectors (look at X0, λI )

  4. Distributions used for comparisons • Energy depositions per layer • Energy depositions per cell • Number of hits per layer • Dependence of Nhits with threshold

  5. Ecal: Energies per layer R A N G E O U T S MIP peaks

  6. Hcal: energies per layer Significant Disagreements?

  7. Ecal: energies per cell Discrepancies! ECal threshold at 0.04 MeV

  8. Hcal: energies per cell Slightly different slopes… HCal threshold at 0.7 MeV

  9. Ecal: energies in absorbers LCDG4 only, Mokka does not provide energies in absorbers MIP peaks

  10. HCal: energies in absorber LCDG4 only, Mokka does not provide energies in absorbers MIP peaks

  11. Cross checking: Ecal+Hcal, cell+abs LCDG4 only

  12. Number of hits per layer

  13. ECal Nhits x threshold – 50 GeV muons ECal threshold

  14. Ecal Nhits x threshold – 50 GeV pions ECal threshold

  15. Ecal Nhits x threshold – 50 GeV positrons ECal threshold

  16. Nhits on Hcal – Dependence on thresholds HCal threshold HCal threshold

  17. Conclusions • Energy deposition: very good agreement on both layer and cell distributions • Number of hits: Good agreement on shapes, small disagreement on normalization • LCDG4 and Mokka give compatible results for the calorimeter simulations of SD detectors • MC particles contributing to hits: expect a bug fix quite soon! • Requests for event processing are welcome, pleasesend a message to jeremy@nicadd.niu.edu.

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