Understanding performance issues in Em showers and optical photon transport

General support to users

Via hyper news and others..
Will absorbe more than 50% of our availability.

Special mention to the LCG meetings:

  • Atlas, still open: Hadronic EndCap Calorimeter ..
  • General conclusions about Em physics.
  • Second iteration: shower profiles.

Model approach

To allow several models of the same process. Mainly concerned : Ionisation, Bremsstrahlung, MultipleScattering.
Default in Geant4 V6.0 —> waiting for feedback

Expected developments in standard electromagnetic physics

  • High Energy processes (above 10 TeV)
    The discussion with the MEPhI group (Kokoulin, Bogdanov) has continued.
    A priority list has been agreed for :

  • precise investigation of the current processes
  • a program of development for the next two years.

To be done in 2004:

  • revision of the Bremsstrahlung and Gamma Conversion, and implementation of the LPM effect in Gamma Conversion.

  • options for Mu Nuclear interaction, under discussion with experts on hadronic physics.

  • an alternative model to the Multiple Scattering for high energy muons.

  • A specific implementation of Multiple Scattering for generic ions.

  • Completion of the PhotoElecticEffect at the level of Geant3.21: deexcitation and Auger electrons

  • Revision of the Compton Effect. Inclusion of ‘Doppler broadening’ ?

  • New implementation of the Synchrotron radiation (Helmut Burkhardt /Cern).

  • Revision of the Transition Radiation models.

  • Revision of the implementation of Photo Absortion Ionization process.

  • Optical photon: design a flexible and expendable scheme with which to specify the sampling of micro facet normals, beyond the two models now available.

new TestEm example(s) and PhysicsLists

  • TestEm11 devoted to ultra high energy muons.

  • Substantial rewrite and extension of novice example N06

  • Provide examples of PhysicsList by use-cases, rather than to multiply complete examples.


Physics reference manual: revision after ‘rewording’.

Plot of cross sections

Provide an equivalent of the command drmat in Geant3: crosssections, de/dx.
Still pending.
The store/retrieve PhysicsTables could be a starting point.
Specific Visualisation application ?