g4Config_opt.C File Reference

Go to the source code of this file.

Functions
void	Config ()

Function Documentation

void Config

(

)

Create the run configuration In constructor user has to specify the geometry input and select geometry navigation via the following options:

• geomVMCtoGeant4 - geometry defined via VMC, G4 native navigation
• geomVMCtoRoot - geometry defined via VMC, Root navigation
• geomRoot - geometry defined via Root, Root navigation
• geomRootToGeant4 - geometry defined via Root, G4 native navigation
• geomGeant4 - geometry defined via Geant4, G4 native navigation

The second argument in the constructor selects physics list:

• emStandard - standard em physics (default)
• emStandard+optical - standard em physics + optical physics
• XYZ - selected hadron physics list ( XYZ = LHEP, QGSP, ...)
• XYZ+optical - selected hadron physics list + optical physics

The third argument activates the special processes in the TG4SpecialPhysicsList, which implement VMC features:

• stepLimiter - step limiter (default)
• specialCuts - VMC cuts
• specialControls - VMC controls for activation/inactivation selected processes
• stackPopper - stackPopper process When more than one options are selected, they should be separated with '+' character: eg. stepLimit+specialCuts.

Create the G4 VMC

create the Specific stack

Customise Geant4 setting (verbose level, global range cut, ..)

Definition at line 2 of file g4Config_opt.C.

References PndStack::SetMinPoints(), PndStack::StoreSecondaries(), and TString.

{

   TG4RunConfiguration* runConfiguration 
           = new TG4RunConfiguration("geomRoot", "QGSP_BERT_EMV+optical", "stepLimiter+specialCuts+specialControls");

   TGeant4* geant4 = new TGeant4("TGeant4", "The Geant4 Monte Carlo", runConfiguration);
   cout << "Geant4 has been created." << endl;

  geant4->ProcessGeantCommand("/optics_engine/selectOpProcess Cerenkov");
  geant4->ProcessGeantCommand("/optics_engine/setTrackSecondariesFirst false");

   PndStack *stack = new PndStack(1000); 
   stack->StoreSecondaries(kTRUE);
   stack->SetMinPoints(2);
   geant4->SetStack(stack);

   if(FairRunSim::Instance()->IsExtDecayer()){
      TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
      geant4->SetExternalDecayer(decayer);
   }
  

   TString configm(gSystem->Getenv("VMCWORKDIR"));
   configm = configm + "/gconfig/g4config.in";
   cout << " -I g4Config() using g4conf  macro: " << configm << endl;

     //set geant4 specific stuff
   geant4->SetMaxNStep(10000);  // default is 30000

  Text_t buffer[50];
  sprintf(buffer,"/random/setSeeds %i  %i ",gRandom->GetSeed(), gRandom->GetSeed());
  geant4->ProcessGeantCommand(buffer);
 
  geant4->ProcessGeantMacro(configm.Data());


}