|Message: Re: Large system, very slow field tracking... how to improve?||Not Logged In (login)|
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Just in case anyone else has the same problem I thought I should post my solution... I implemented this code yesterday and it works great. It would not be an exaggeration to say the program runs more than 100x faster. in DetectorConstruction.cc: SolarField* theField = new SolarField(); G4FieldManager* fieldMgr = G4TransportationManager::GetTransportationManager() ->GetFieldManager(); G4double minStep = 1*mm; G4Mag_UsualEqRhs* theEqn = new G4Mag_UsualEqRhs(theField); G4MagIntegratorStepper* theStepper = new G4HelixExplicitEuler(theEqn); G4MagInt_Driver* theDriver = new G4MagInt_Driver(minStep, theStepper, theStepper->GetNumberOfVariables()); G4ChordFinder* theFinder = new G4ChordFinder(theDriver); fieldMgr->SetChordFinder(theFinder); fieldMgr->SetDetectorField(theField); In addition to using the Helix integrator, scaling the tracking parameters to match the simulation size gave me another noticeable improvement in the running time. Thanks all! -Tim Chambers
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