Contribution to WP2 Reconstruction Toolkit: from SDHCAL Group Manqi RUAN Laboratoire Leprince-Ringuet (LLR) Ecole Polytechnique 91128, Palaiseau 17/02/2011 AIDA Kick Off @ CERN 1
Outline GOAL: Reconstruction toolkit for detector with a high granularity gaseous HCAL To understand gaseous HCAL physics ● Study shower developments under different conditions ● – Contribution from Neutrons Reliable simulation: ● Different models ● Digitization module with experimental input ● Reconstruction toolkit ● Shower recognition, Linking, Energy Estimation, Particle ● Identification... 17/02/2011 AIDA Kick Off @ CERN 2
Gaseous HCAL Gaseous: ● Economic option with extremely high granularity ~ Better separation ● Almost blind to neutrons ● Recorded Information: energy deposition + Shower shape (hit positions) ● Very small sampling factor ~ huge fluctuation in analogue readout ~ Digital ● Readout Shower shape: Depend on ● – Particle type ~ Particle ID – Energy ~ Energy estimation – Detector setting ~ geometry optimization Proton/ion hits with E > 100 mips in 40GeV Klong sample 17/02/2011 AIDA Kick Off @ CERN 3
Neutron hits 40GeV Pion @ AHCAL with/without 0.1 mip cut 40GeV Pion @ DHCAL Hit Colour: EM (blue), Neutron (yellow) or hadronic (red) AHCAL: Shower centre surrounded by lots of low energy ● neutron hits Impact needs careful analysis: Confusion & Energy resolution ● 17/02/2011 AIDA Kick Off @ CERN 4
Simulation ● MC Models G4 Test beam prototype ● Full detector simulation in Mokka ( ILD with Scintillator & RPC HCAL ) ● 17/02/2011 AIDA Kick Off @ CERN 5
Simulation MC Models: To distinguish sensor performance from detector ● geometry: RPC adapted to Tesla ( R. Han @ IPNL, G. Musat @ LLR) A la videau RPC Scintillator New! TESLA 17/02/2011 AIDA Kick Off @ CERN 6
Reliable Simulation Digitization module: ● Energy deposition - induced charge dependence, saturation effects ● Test beam input: efficiency, multiplicity, noise rate, homogeneity ● fluctuation R. Han @ IPNL: induced charge & avalanche spatial distribution Geant 4 comparison with TB data (cubic meter) ● 17/02/2011 AIDA Kick Off @ CERN 7
Reconstruction toolkit Sub detector: ● – Tracker: Kink & vertex tagging & treatment – Calorimeter: shower recognition for extremely high granularity: ● Optimize the algorithm & parameters ( to balance separation and double counting ) Particle reconstruction: ● – Charged particle: Matching & Linking – Neutral particle: Energy estimator based on topological information ● Identify EM/MIP part in hadronic shower; Kalman filter to reconstruct MIP track momentum... ● Compensation – PID 17/02/2011 AIDA Kick Off @ CERN 8
Reconstruction toolkit MIP tagging in ● hadronic shower in gaseous DHCAL: 40GeV pion Calibration/Stability 1 TeV ttH@CLIC_SID – monitoring in situ Maintain & upgrade ● Druid event display 17/02/2011 AIDA Kick Off @ CERN 9
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