Dear All experts,
I am new to Geant4. I have simulated a modified Linac iX for the electron flash (9MeV) system using PMMA collimator. Before that I simulated it as conventional linac and the PDD was reasonable. However, when I place PMMA collimator as shown in the image below, the geant4 show a short dmax compared to measurement. May I know if anyone can suggest any aspect to look at?
Best regards,
Vannyat
Geant4 Version:11.3.2
Operating System: Window
Compiler/Version: 1.95.3
CMake Version: