ACAT ’02 CMS GEANT4 Sim. & Detector Desc. Pedro Arce(CERN/CIEMAT) 1 Simulation Framework and XML...

ACAT ’02 CMS GEANT4 Sim. & Detector Desc. Pedro Arce(CERN/CIEMAT)

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Simulation Framework and

XML Detector Description for the

CMS ExperimentARCE Pedro1,2, BANERJEE Sunanda3, BOCCALI Tomasso4, CASE Michael5, De

ROECK Albert2, LARA Vicente2, LIENDL Martin2,6, NIKITENKO Alexander7, SCHRODER Matthias2, STRAESSNER Arno2, Van LINGEN Frank2, WELLISCH Hans-

Peter2, WENZEL Hans8

1CIEMAT, Madrid, Spain, 2CERN, Geneva, Switzerland, 3Tata Institute, Bombay, India, 4INFN Bari, Italy, 5UC Davis, USA, 6HEPHY, Vienna, Austria, 7Imperial

College, UK, 8Fermilab, Chicago, USA

(for the CMS Collaboration)

ACAT 2002, Moscow, 23th June 2002


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Outline

GEANT4 simulation framework (OSCAR)

OSCAR – IGUANA Visualisation

OSCAR Physics comparison

GEANT4 Performance comparison

DDD scope

Basic aspects and architecture

Document structuring

Summary


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CMS Simulation & Reconstruction

Monte-Carlo generator

Ntuple

ZebraFZ

CMSIM

CMSIM

CMSjet

User AnalysisR

TR

AN

w

Monte-Carlo generator

OODB

OSCAR

ORCA

User Analysis

FAMOS

FAMOS

OO

world


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GEANT4 Simulation (OSCAR)Geometry:

All geometry up-to-date

Currently moving to geometry in XML database, common to Simulation/Reconstruction/Visualisation

Detailed checking in progress

CMS Overlap Detection ToolGEANT4 expects:

(a) Daughters of the same mother must not intersect each other

(b) Daughters of the same mother must be fully contained in their mother

(c) some refinements of the above in case of replication and parameterisation

If these conditions hold for every mother-volume and the first level of daughters therein, the geometry is OK!


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Shoot geantinos


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View of CMS muon system Sliced view of CMS barrel detectors


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OSCAR

Primary generator:

CMS particle gun: Scan in , , energy Random in , , energy

Interface with HEPEVT ASCII files Interface with PYTHIA ntuples

Persistency: Hits

Primary generator particles

Selected tracks

Using Objectivity, moving to ROOT


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OSCAR - IGUANA Interactive visualisation is done with IGUANA (see poster in this Conference)

Visualise any GEANT4 Geometry Select by logical volumes / by individual copies / by category Show volume/object details/properties Picking, slicing

GEANT4 command line A wizard to guide through OSCAR settings Integrated with overlap detection Adding other extensions is trivial (e.g. GUIs like overlap detection) Visualise TracksVisualise magnetic field

2D plane that can be rotated Field direction as an arrow Field intensity as colour


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OSCAR - IGUANA

CorrelatedPicking

Example extension (a trivial wizard)Queried from plug-in database, loaded on

request and bound to IGUANA G4 Run Manager

IGUANA viewer displaying OpenInventor scene

Control of arbitraryGEANT4 tree

Overlap detection


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CMS magnetic field in IGUANA


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OSCAR

Physics:

Electromagnetic processes needed at LHC

Hadronic processes needed at LHC

CMS Physics Technical Design Report is planned to be

written using OSCAR (due december 2004)

OSCAR milestone June 2003:

“Reproduce the physics results of the GEANT3 simulation with the same performance”


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GEANT4/GEANT3 simu. + ORCA reco.

CMS central tracker Single events


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GEANT4/GEANT3 simu. + ORCA reco.

CMS muon system Single events

phi_sim - phi_rec eta_sim - eta_rec Pt_sim - Pt_rec


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GEANT4/GEANT3 ECAL comparisons


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Full events in full CMS

> 10000 events without crashing

- H, tte, Z

- All CMS geometry

- 3D TOSCA magnetic field

- Production and tracking cuts as in CMSIM

- geant4.4.0.ref02

- Pentium III 850 Mhz, 640 Mb

OSCAR Time Performance


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H in all CMS (10 Events)

OSCAR (427136 tracks)

- CMSIM (442828 tracks)

MeV

Initial track energy

OSCAR (427136 tracks)

- CMSIM (442828 tracks)

Track length

MeV

No

Tra

cks

No

Tra

cks


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Time performance

- H (10 events)

CMSIM: 439k tracks 318 secondsOSCAR: 400k tracks 583 seconds (1.83)

- tte (10 events)


- Z (10 events)


No GEANT4 optimization done yet!


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ACAT ’02 CMS GEANT4 Sim. & Detector Desc. Pedro Arce(CERN/CIEMAT) 1 Simulation Framework and XML...

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