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ITTF Detector Model

ITTF Detector Model. Ben Norman Kent State University For the Integrated Tracker Task Force. Outline. Introduction Detector Representation Material Shape Placement Usage Detector Container Detector Builder Extension Subsystem responsibilities ITTF responsibilities

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ITTF Detector Model

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  1. ITTF Detector Model Ben Norman Kent State University For the Integrated Tracker Task Force

  2. Outline • Introduction • Detector Representation • Material • Shape • Placement • Usage • Detector Container • Detector Builder • Extension • Subsystem responsibilities • ITTF responsibilities • Material Interaction • Intersection • Scattering & Energy Loss • Summary ITTF Review (BNL)

  3. Detector Representation • Detector  Volume • Active Detector  Hit Information • Passive Detector  Simple Scatterer • Flags • On: added to detector container • Active: provides hit information • Discreet: discreet scatterer (SVT ladder) • Continuous: continuous scatterer (TPC padrow) ITTF Review (BNL)

  4. Detector Representation II • Material • Density • Radiation length • Shape (Cylindrical,Rectangular,Conical) • Extent • Boundaries (including edge regions) • Placement • Normal representation • Center representation ITTF Review (BNL)

  5. Detector Representation III ITTF Review (BNL)

  6. Usage • Sti(Coded)DetectorBuilder • Reads offline dB • Creates all materials, shapes, placements, & detectors • StiDetectorContainer • Stores Detectors in tree structure • Ordered by: (extensible) • Forward/mid/backward rapidity • Radial position / z • Azimuth ITTF Review (BNL)

  7. Root Mid Backward Forward Layer 1 Layer n Section 1 Section n Element 1 Element n (StiDetectorContainer) [Thanks, Mike] ITTF Review (BNL)

  8. Extension • Subsystem tasks: • Write StXXXHits objects into StEvent • Transformation functor StXXXCoordinateTransform • StXXXLocalCoordinate  StGlobalCoordinate • SqlDB access to detector physical characteristics: • Size • Position • Material – density & radiation length approximations ITTF Review (BNL)

  9. Extension II • ITTF Responsibilities: • Create StiKalmanTrackNode subclass • Use z as independent parameter (instead of r) • Add to StiHitFiller • fillXXXHits(): copies StHits to StiHits for tracking • Add to StiGeometryTransform: • Pointers to transform functors • Utility methods • Add to StiCodedDetectorBuilder: • Materials in buildMaterials() • Shapes in buildShapes() • Placements in buildDetectors() • Detectors in buildDetectors() • Add to StiLocalTrackSeedFinder • Starting points for seed-finding (eg., outer layers of FTPC) ITTF Review (BNL)

  10. Material Interaction • Intersection - StiMaterialInteraction • Line extrapolation for short steps • Helix extrapolation available for long steps • Scattering / Energy Loss • StiMaterialInteraction determines • # of radiation lengths traversed in each step • Radial distance traversed • Mean density • Track finder computes E-loss & effect of scattering on error matrix ITTF Review (BNL)

  11. Conclusions • Modularity assures extensibility • Well defined path for extension • Tracker truly integrates heterogeneous STAR components ITTF Review (BNL)

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