Contribution to WP2 Reconstruction Toolkit: from SDHCAL Group Manqi - - PowerPoint PPT Presentation

17/02/2011 AIDA Kick Off @ CERN 1

Manqi RUAN

Laboratoire Leprince-Ringuet (LLR) Ecole Polytechnique 91128, Palaiseau

Contribution to WP2 Reconstruction Toolkit: from SDHCAL Group

17/02/2011 AIDA Kick Off @ CERN 2

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...

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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

• ptimization

Proton/ion hits with E > 100 mips in 40GeV Klong sample

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Neutron hits

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

40GeV Pion @ AHCAL with/without 0.1 mip cut 40GeV Pion @ DHCAL

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Simulation

• MC Models
• G4 Test beam prototype
• Full detector simulation in Mokka ( ILD with Scintillator & RPC HCAL )

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Simulation

• MC Models: To distinguish sensor performance from detector

geometry: RPC adapted to Tesla ( R. Han @ IPNL, G. Musat @ LLR)

New!

A la videau TESLA RPC Scintillator

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Reliable Simulation

• Digitization module:
• Energy deposition - induced charge dependence, saturation effects
• Test beam input: efficiency, multiplicity, noise rate, homogeneity

fluctuation

• Geant 4 comparison with TB data (cubic meter)
• R. Han @ IPNL: induced charge & avalanche spatial distribution

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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

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• MIP tagging in

hadronic shower in gaseous DHCAL: Calibration/Stability monitoring in situ

• Maintain & upgrade

Druid event display

Reconstruction toolkit

40GeV pion

–

1 TeV ttH@CLIC_SID