Dear all, I am new to GEANT4 and would appreciate some help. I currently have a setup which consists of consecutive silicon discs. It is supposed to track e+ and e- coming from gamma conversion. I shoot a photon at these layers, but the photon conversion (to e+e-) probability is very low. The thi…

I recommend the biasing built into electromagnetics processes: https://geant4-userdoc.web.cern.ch/UsersGuides/ForApplicationDeveloper/html/TrackingAndPhysics/physicsProcess.html#electromagnetics-secondary-biasing

Dear @dsawkey , Thank you for your answer. That gives me something new to look into. The command to target a specific “region” is /process/em/setSecBiasing processName Region factor energyLimit energyUnit processName would be “conv” I assume. Line 80 at Geant4: G4GammaConversion.hh Source File W…

Update: I found out it does not find my logical (nor physical) volume. I suspect this is because you need to provide a “Region”. For that you need to register your logical volume as region. I did that as follows in DetectorConstruction::ConstructSDandField mRegion = new G4Region("target"); mRegion…

Indeed, “Region” is a G4Region. As a test, try the world region: /process/em/setSecBiasing conv world 2000 500 MeV (or it may be World with a capital W) If that works, try using the name of the relevant region, in your case “target”, instead of “world”.

Parallel thread: [image] Help me find information on biasing Particles, Track, Event, Run and Biasing Dear all, I week or so ago I posted a question about biasing in GEANT4 which was left unanswered. Perhaps I asked the wrong question, but to me it seems there might not…

Biasing of G4GammaConversion in a volume

Particles, Track, Event, Run and Biasing

dsawkey March 20, 2024, 6:28pm 6

Parallel thread: