g4Config_Cherenkov.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

Definition at line 2 of file g4Config_Cherenkov.C.

References PndStack::SetMinPoints().

{

  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("/mcVerbose/all 0"); 
  geant4->ProcessGeantCommand("/mcVerbose/eventAction 1");
  
  // geant4->ProcessGeantCommand("/optics_engine/selectOpProcess Cerenkov");
  // geant4->ProcessGeantCommand("/optics_engine/setTrackSecondariesFirst false"); 
  // geant4->ProcessGeantCommand("/optics_engine/setCerenkovMaxPhotons 5");
  // geant4->ProcessGeantCommand("/optics_engine/setCerenkovMaxBetaChange 0.1");
  
  PndStack *stack = new PndStack(1000); 
  //stack->StoreSecondaries(kFALSE); //default is kTRUE
  stack->SetMinPoints(2);
  geant4->SetStack(stack);

  if(FairRunSim::Instance()->IsExtDecayer()){
    TVirtualMCDecayer* decayer = TPythia6Decayer::Instance();
    geant4->SetExternalDecayer(decayer);
  }
  
  geant4->SetMaxNStep(10000);  // default is 30000

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