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// $Id: RemSimPositronStandard.cc,v 1.8 2009/11/12 05:29:47 cirrone Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// Author: Susanna Guatelli, guatelli@ge.infn.it
#include "RemSimPositronStandard.hh"
#include "G4ProcessManager.hh"
#include "G4Gamma.hh"
#include "G4ParticleDefinition.hh"
#include "G4eMultipleScattering.hh"
#include "G4eIonisation.hh"
#include "G4eBremsstrahlung.hh"
#include "G4eplusAnnihilation.hh"
#include "G4StepLimiter.hh"

RemSimPositronStandard::RemSimPositronStandard(const G4String& name): G4VPhysicsConstructor(name)
{ }

RemSimPositronStandard::~RemSimPositronStandard()
{ }

void RemSimPositronStandard::ConstructProcess()
{
  // Add standard processes for positrons
  
  theParticleIterator -> reset();

  while( (*theParticleIterator)() )
    {
      G4ParticleDefinition* particle = theParticleIterator -> value();
      G4ProcessManager* manager = particle -> GetProcessManager();
      G4String particleName = particle -> GetParticleName();
     
      if (particleName == "e+") 
	{
	    // Positron      
      G4eMultipleScattering* msc = new G4eMultipleScattering();
      msc->SetStepLimitType(fUseDistanceToBoundary);
      manager->AddProcess(msc,-1, 1, 1);
	
      // Ionisation
      G4eIonisation* eIonisation = new G4eIonisation();
      eIonisation->SetStepFunction(0.2, 100*um); //     
      manager->AddProcess(eIonisation,                 -1, 2, 2);

      //Bremsstrahlung (use default, no low-energy available)
      manager->AddProcess(new G4eBremsstrahlung(), -1,-1, 3);

      //Annihilation
      manager->AddProcess(new G4eplusAnnihilation(),0,-1, 4);    

      manager -> AddProcess(new G4StepLimiter(),  -1,-1,3);
	}
    }
}