HO SiPM Simulation Rick Wilkinson, Jake Anderson 1

C++ SiPM Simulation By Jake & Jeremy Saturation as a function of effective # of pixels. # of pixels = area of fibers * pixel density Recovery time 2 See Jake’s talk –

HO SiPM Sim Parameters SiPMs hotter –SiPM: 18 photons/mip –HPD: 1.5 p.e./mip –Better for muons 36 Zecotek devices –36000 pixels Nonlinear ~ 80 GeV 96 Hamamatsu devices –960 pixels Nonlinear ~ 2 GeV 3

CMSSW HCAL Simulation Three gains are used as input –Calibration (GeV/fC) From DB, by channel –Electronics (fC/photoelectron) One parameter per subsystem –Sampling factor (GeV / deposited GeV) One parameter per ring These are used to calculate p.e./deposited GeV –All gains cancel themselves out in the chain So we should always reconstruct the correct energy, even if gains aren’t quite appropriate. –Signal/noise will be affected, though. 4

Plans All SiPM code is queued for 3_5_X. –Flag can make HO all HPD, all SiPM, or (hardcoded) current configuration. Anton will make an MC tag for us that includes SiPM gains –CRAFT tags have SiPM gains –MC tags do not. Jake will use that tag for final tuning –He’ll adjust electronics gain to get the correct size final digis Final validation to be done with Salavat’s package 5