Francesco%20Longo

1
Validation of G4 status, prospects discussions

• Francesco Longo
• University of Trieste and INFN-Trieste
• After some discussion at Perugia meeting
• (P.Boinee, R.Rando, R.Giannitrapani,
  J.Cohen-Tanugi)
• Analysis Group 02.06.2003

2
Setup for the study(F.Longo and J.Cohen Tanugi)

• Standalone G4 tests use MC information to
  retrieve deflection angle between initial and
  final direction of an normally incident charged
  track.
• Converting Volume is a Tungstene Slab
  thin (0.105 mm) and thick
  (0.723mm)
• Projected angle is computed as
  arcsin(p_f.x()/p_f.mag())
• Test is to compare its distribution to Moliere
  formula (pdg 26.10),
• 1 and 10 GeV mu and e-

3
MCS status and developments

• Note that G4 uses another model than Moliere
  theory
• Discrepancy for muons at the 20-24 level in
  G4.5.1
• Contacts with G4 developers at CERN
• Bug fix in G4.5.2 (ok for muons and protons)
• For e-? G4 developers model fits well data on e-
  (low energy) could we give them more data?
• Using the Moliere theory also for e-?

4
G4 physics validation
5
G4 physics validation
Koi (SLAC)
6
G4 physics validation
7
G4 physics validation
Preliminary (not released with G4 5.2)
8
G4 validation for DC1

• Photon processes
• Photoelectric, Compton, Pair production
• Cross Section
• Angular Distribution
• Energy distribution
• Charged particle processes
• Ionisation
• Landau, Bethe Bloch
• Range, Stopping Power, Straggling
• Multiple Scattering
• Projected Angle, Energy dependence
• Bremsstrahlung
• Cross Section, Angular Distribution, Energy
  Distribution
• Delta ray production
• Energy distribution, Multiplicity
• Positron Annihilation
• Cross section
• EM shower profile
• Mizunos thesis confirmation

9
G4Validation

• Geant4 test and analysis
• G4 comparison projects
• E.g. ATLAS
• GLAST validation
• GEANT4TEST package in systests
• Low level validation on Gleam level
• High level comparison (Baloon, EM, test beam(s),
  )
• Requirements from Subsystems
• Statistical methods?