Plan2012

ELECTROMAGNETIC WORKING GROUP 
plan of activity for 2012
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(1) - June 2012
(2) - December 2012
[LE] - in collaboration with the Low-energy EM working group

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1) LHC experiments support
- EM shower shape - ATLAS and CMS (1/2)
- Energy deposition in tracking detectors - ALICE (1/2)
- Multiple and single scattering - LHCb (1/2)

2) R&D study on multi-threading and vectorized simulation for EM physics (1/2)

3) Validation and verification of EM physics:
- perform regular execution and regresion analysis using existing
testing suites (1/2)
- continue detailed comparison of Standard, Livermore and
Penelope models [LE] (1/2)
- adding ILC (including CALICE) calorimeter tests (2)
- adding extra benchmark for bremsstrahlung (2)
- improved CPU benchmarking (1/2)

4) EM infrastructure update:
- improved interface to angular generator (1)
- reduce initialisation time and memory for muons (1)
- move initialisation of tables for multiple scattering from process
to model, introduce base material approach for multiple scattering (1)

5) Further update of ionization processes:
- review and improvements for fluctuation models (1/2)

6) Further development of the processes of multiple and single scattering:
- further development of WentzelVI model (1)
- further development of Goudsmit-Saunderson model (1)
- review and improved interaction between Transportation
and Multiple scattering including lateral displacement
and step limitation (1/2)
- hadron multiple scattering coherent with hadron diffuse model (2)

7) Bremsstrahlung and gamma-conversion models:
- introduce parameterisation of Seltzer-Berger cross sections instead
of data table (1/2)
- improved parameterisation for positron cross section (2)
- improved angular generator (1/2)
- updated gamma-conversion model at low-energies [LE](2)

8) Improvements in high energy processes
- migration of mu+mu- production to model design(2)
- improved angular generator for synchrotron radiation (1)
- review of the model of e+e- pair production (1)

9) Optical photon physics
- Extension to the unified surface model to have both specular and
diffuse components for the transmitted photons (1)
- Modeling of optical transport in a volume that has different optical
treatments on different sides (2)

10) Shopping list for work items for which no manpower assigned

Infrastructure:
- provide range computations in G4EmCalculator
- improved ion stopping in G4EmCalculator
Validation/examples:
- adding test on fluctuation of energy loss at moderate energies
- improve and extend validation of shower shape
- adding extra automatic tests on hadron scattering
- new validation of EM showers in light media (air, ice)
- new validation for muon cooling simulations
- improve validation of energy loss fluctuations
- providing example for ultra-relativistic gamma-conversion model
New/improved models:
- improved X-rays fluorescence sampling in photo-electric model
- improved Compton scattering model with Doppler broading
New optical features:
- Implementation of a more flexible micro facet sampling method
for optical surfaces
- Extend some of the boundary process implementation to X-rays