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Report to Simulation Meeting. 20 May, 2004 Akiya Miyamoto, KEK. Jupiter. : Geant4 based Full Detector Simulator. Features: Modular structure for easy update, install/uninstall of sub-detectors Powerful base classes that provide unified interface to

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Report to Simulation Meeting

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Report to simulation meeting

Report to Simulation Meeting

20 May, 2004

Akiya Miyamoto, KEK



: Geant4 based Full Detector Simulator

  • Features:

    • Modular structure for easy update, install/uninstall of sub-detectors

    • Powerful base classes that provide unified interface to

      • facilitate easy (un)installation of components by methods such as InstallIn, Assemble, Cabling

      • Help implementation of detailed hierarchiral structures.

        This helps to save memory size.

      • Minimize user-written source code by

        • Automatic naming system & material management

        • B-field compositions for accelerators

    • Input: HEPEVT, CAIN (ASCII) or generators in JSF.

    • Output

      • Output class allows extrnal methods. Using this mechanism, it can output ASCII flat file and JSF/ROOT fie.

Core developper: K.Hoshina and K.Fujii

Standard geometry of jupiter

Standard Geometry of Jupiter

Super Conducting Solenoid




Central Tracker(CDC)

Intermediate Tracker(IT)

Vertex Detector(VTX)

Detector geometries in jupiter

Detector geometries in Jupiter


Individual drift cells and wires

Axial and stereo geometry

VTX detector

VTX sensor


Geometry parameters

such as #layers, #pixels,….

controled by a ParameterList class

for easy modification




Beam delivery system

Beam Delivery System

for Beam BG Study


Crossing 3mrad

Detector Model

Model d)

L*=4.3 m

3T (Solenoid)







Sample events by jupiter

Sample events by Jupiter

Beam Background Simulated

By Jupiter

Event source : CAIN

Jupiter and jsfj4

Jupiter and JSFJ4

  • JSFJ4 is a Jupiter-JSF interface

Jupiter commponents

Jupiter Commponents

  • Jupiter1)Framework 1-1)LCIO 1-2)Geometry Management2)Component (Red letter was established component) 2-1)IR 2-2)VTX 2-3)CT <- Jet                   (TPC) 2-4)IT+FT 2-5)Cal <- Spherical model (Tower/2parts, Tile?)                   More realistic model (Tile, Strip)                   Digital model 2-6)Mag(Simple Solenoid) 2-7)Muon+Return Yoke

For jet mass reconstruction

For Jet mass reconstruction

  • Following packages are required for jet mass reconstruction

    • Track reconstruction

      • Central Tracker track finder and fitter

      • Link Central Tracker and IT/VTX for refitting

      • Track extrapolation to CAL

    • Cal reconstruction

      • Two algorithm

        • (a) Cal clustering

          • EM clustering -> EMC-Track Match -> e/gamma ID

            -> mu-ID -> HD clustering -> HDC-Track Match -> Neutral Particle

        • (b) Track based clustering

          • Remove Charged track energy from cell -> muID -> EM Clustering -> HD Clustering

    • Jet Clustering

    • Vertexing and heavy quark tagger

Develop them in parallel, not serially

Study items and works to do

Study items and works to do

  • Implement CAL geometries

    • Spherical, cylindrical, realistic with tilt and gaps

    • For spherical, 5x5mm2, Pb 8mm, Sci. 2mm or Pb 4mm, Sci 1mm (?)

  • Single particle performances

    • Linearity, resolution, lateral/longitudinal spread

    • Caliburation and optimum cut values

    • How strongly these performances depend on geometries

  • Two-particle or jet performance

    • Develop clustering algorithm

    • Study electron/gamma ID performance

    • Study pi+/n ID performance

      Study dependences on detector geometry and parameters

Study items 2

Study items - 2

  • Jet reconstruction

    • Masses of W, Z, H, T …. Which process ?ee-> ZH->nnH @ 250GeV or WW->enW @500GeV

      or ee-> ZZ->nnqq @ 500 or 1000 GeV

    • Energy and direction of jets

  • Background rejection

    • Off timing mini-jet tracks

    • Muon from upstream

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