Some EGS Studies… Compare with Geant4 Questions of range/cutoff

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Presentation transcript:

Some EGS Studies… Compare with Geant4 Questions of range/cutoff EM Resolution understood? Moliere radius – readout gap relation Input shower widths for fast MC Calibration requirement (electronics design) ECal depth containment Transverse/long. segmentation for pattern recognition Optimize coarser sampling with depth Minimum number of silicon layers (30? 25? 20??) SiD Cal R. Frey

EGS4 Setup Config: 30 x [ 5/7 X0 (2.5 mm) + 1.25 mm gaps] Thin EM sampling (Si) If energy cutoffs (EGS) are too large, then the simulated range of low energy secondaries exceeds the physical range Their energy doesn’t get deposited in the sensitive region. Presumably the same issue exists for Geant4 (range cut) SiD Cal R. Frey

Do we need the “skins” in this case? with skins 10 GeV photons about 3x more CPU time σ/E = 0.160/E no skins σ/E = 0.167/E SiD Cal R. Frey

transverse spatial distributions (5 GeV photons) E vs x: all layers About a 20-25% difference skins no skins E vs x at layer 4 Note: rms is 0.44 pixel (2,2 mm) SiD Cal R. Frey

Superb Position Resolution for 1 GeV Photons Graham Wilson - Victoria Superb Position Resolution for 1 GeV Photons For illustration purposes only !: Si-W, 42 layers, 1mm x 1mm pixels, RM = 13.5 mm First 10/7 X0 330 mm First 15/7 X0 380 mm 1 GeV photons Transverse segmentations much finer than 5 mm may be useful – Si strips ? Integrated 1500 mm SiD Cal R. Frey Graham W. Wilson Position residual (mm)

energy resolution (photons) 5 GeV use rms for width: 0.16/E 10 GeV 20 GeV SiD Cal R. Frey

Compare with Geant4 N. Graf, G. Wilson, RF Used infinite planes of 2.5 mm W + 1mm G10 + 0.4mm Si Found that Geant4 with (standard?) 1mm range cut underestimated the energy deposited in the silicon by 15-20% (and hence the standard Geant4 gets poorer energy resolution) Found that the two converged for a Geant4 range cut of 0.1mm (or about 1 KeV equiv. energy cutoff) CPU time increases by factor 30 SiD Cal R. Frey

EGS4/Geant4 contd Can make EGS approximate Geant4 with 1mm range cut by removing the skins and changing energy step from 0.3% (upper plot) to 2% (lower) SiD Cal R. Frey

Effective Moliere radius - old Standard SD: 5x5 mm2 pixels with (1) 0.4mm or (2) 2.5mm readout gaps. 10 GeV photons; look at layer 10 SiD Cal R. Frey

Alternative Sampling Configurations – old study 50 GeV electrons 30 x 5/7 X0 20 x 5/7 X0 + 10 x 10/7 X0 better containment poorer sampling SiD Cal R. Frey