| Summary: | probrem of accumulation of energy loss in standard EM | ||
|---|---|---|---|
| Product: | Geant4 | Reporter: | tkoi |
| Component: | processes/electromagnetic | Assignee: | Michel.Maire |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | ||
| Priority: | P2 | ||
| Version: | 7.0 | ||
| Hardware: | Other | ||
| OS: | Other | ||
We have identified the origin on the problem. Under study ... |
It looks like there is a problem of accumulation of energy loss (ionization loss) in standard EM. In example N03, I changed thickness of Gap and Absorber to 1 nm, then there is no energy loss is happened when e- 50MeV passing 20nm sandwich calorimeter. (I attached G4Track information at bottom.) I changed primary particle to proton, similar feature is also observed, however in this case, only 1 layer (1st lead absorber) has deposit energy of 21.0 eV. I changed physics list to use low energy EM module, then this curios feature disappeared. Tatsumi ******************************************************************************* ************************** * G4Track Information: Particle = e-, Track ID = 1, Parent ID = 0 ******************************************************************************* ************************** Step# X Y Z KineE dEStep StepLeng TrakLeng Volume Process 0 -12 nm 0 fm 0 fm 50 MeV 0 eV 0 fm 0 fm World initStep 1 -10 nm 0 fm 0 fm 50 MeV 0 eV 2 nm 2 nm World Transportation 2 -9 nm 0 fm 0 fm 50 MeV 0 eV 1 nm 3 nm Lead Transportation 3 -8 nm -20.5 fm 63 fm 50 MeV 0 eV 1 nm 4 nm liquidArgon Transportation 4 -7 nm -26.8 fm 126 fm 50 MeV 0 eV 1 nm 5 nm Lead Transportation 5 -6 nm -128 fm 109 fm 50 MeV 0 eV 1 nm 6 nm liquidArgon Transportation 6 -5 nm -236 fm 99.4 fm 50 MeV 0 eV 1 nm 7 nm Lead Transportation 7 -4 nm -327 fm 91.8 fm 50 MeV 0 eV 1 nm 8 nm liquidArgon Transportation 8 -3 nm -430 fm 125 fm 50 MeV 0 eV 1 nm 9 nm Lead Transportation 9 -2 nm -532 fm 150 fm 50 MeV 0 eV 1 nm 10 nm liquidArgon Transportation 10 -1 nm -628 fm 199 fm 50 MeV 0 eV 1 nm 11 nm Lead Transportation 11 -7.32e-11 fm -720 fm 221 fm 50 MeV 0 eV 1 nm 12 nm liquidArgon Transportation 12 1 nm -758 fm 220 fm 50 MeV 0 eV 1 nm 13 nm Lead Transportation 13 2 nm -848 fm 220 fm 50 MeV 0 eV 1 nm 14 nm liquidArgon Transportation 14 3 nm -929 fm 220 fm 50 MeV 0 eV 1 nm 15 nm Lead Transportation 15 4 nm -1.09e+03 fm 221 fm 50 MeV 0 eV 1 nm 16 nm liquidArgon Transportation 16 5 nm -1.22e+03 fm 214 fm 50 MeV 0 eV 1 nm 17 nm Lead Transportation 17 6 nm -1.39e+03 fm 236 fm 50 MeV 0 eV 1 nm 18 nm liquidArgon Transportation 18 7 nm -1.55e+03 fm 253 fm 50 MeV 0 eV 1 nm 19 nm Lead Transportation 19 8 nm -1.66e+03 fm 195 fm 50 MeV 0 eV 1 nm 20 nm liquidArgon Transportation 20 9 nm -1.77e+03 fm 138 fm 50 MeV 0 eV 1 nm 21 nm Lead Transportation 21 10 nm -1.88e+03 fm 130 fm 50 MeV 0 eV 1 nm 22 nm liquidArgon Transportation 22 12 nm -2.1e+03 fm 105 fm 50 MeV 0 eV 2 nm 24 nm OutOfWorld Transportation ---> End of event: 0 Absorber: total energy: 0 eV total track length: 0 fm Gap: total energy: 0 eV total track length: 0 fm