G4AdjointPrimaryGenerator.cc

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//
// $Id$
//
//      Class Name:     G4AdjointCrossSurfChecker
//      Author:         L. Desorgher
//      Organisation:   SpaceIT GmbH
//      Contract:       ESA contract 21435/08/NL/AT
//      Customer:       ESA/ESTEC

#include "G4AdjointPrimaryGenerator.hh"
#include "G4PhysicalConstants.hh"
#include "G4Event.hh"
#include "G4SingleParticleSource.hh"
#include "G4ParticleDefinition.hh"
#include "G4AdjointPosOnPhysVolGenerator.hh" 

//
G4AdjointPrimaryGenerator::G4AdjointPrimaryGenerator()
  : radius_spherical_source(0.)
{
  theSingleParticleSource  = new G4SingleParticleSource();
 
  theSingleParticleSource->GetEneDist()->SetEnergyDisType("Pow");
  theSingleParticleSource->GetEneDist()->SetAlpha(-1.);
  theSingleParticleSource->GetPosDist()->SetPosDisType("Point");
  theSingleParticleSource->GetAngDist()->SetAngDistType("planar");

  theG4AdjointPosOnPhysVolGenerator = G4AdjointPosOnPhysVolGenerator::GetInstance();
}
//
G4AdjointPrimaryGenerator::~G4AdjointPrimaryGenerator()
{
  delete theSingleParticleSource;
}
//
void G4AdjointPrimaryGenerator::GenerateAdjointPrimaryVertex(G4Event* anEvent,G4ParticleDefinition* adj_part,G4double E1,G4double E2)
{
   if (type_of_adjoint_source == "ExternalSurfaceOfAVolume") {
        
        //Generate position and direction relative to the external surface of sensitive volume
        //-------------------------------------------------------------

        G4double costh_to_normal;
        G4ThreeVector pos,direction;
        theG4AdjointPosOnPhysVolGenerator->GenerateAPositionOnTheExtSurfaceOfThePhysicalVolume(pos, direction,costh_to_normal);
        if (costh_to_normal <1.e-4) costh_to_normal =1.e-4;
        theSingleParticleSource->GetAngDist()->SetParticleMomentumDirection(-direction);
        theSingleParticleSource->GetPosDist()->SetCentreCoords(pos);
   }    

   theSingleParticleSource->GetEneDist()->SetEmin(E1); 
   theSingleParticleSource->GetEneDist()->SetEmax(E2);  
        
   theSingleParticleSource->SetParticleDefinition(adj_part);
   theSingleParticleSource->GeneratePrimaryVertex(anEvent);
}
//
void G4AdjointPrimaryGenerator::SetSphericalAdjointPrimarySource(G4double radius, G4ThreeVector center_pos)
{ 
  radius_spherical_source = radius;
  center_spherical_source = center_pos;
  type_of_adjoint_source ="Spherical"; 
  theSingleParticleSource->GetPosDist()->SetPosDisType("Surface");
  theSingleParticleSource->GetPosDist()->SetPosDisShape("Sphere");
  theSingleParticleSource->GetPosDist()->SetCentreCoords(center_pos);
  theSingleParticleSource->GetPosDist()->SetRadius(radius);
  theSingleParticleSource->GetAngDist()->SetAngDistType("cos");
  theSingleParticleSource->GetAngDist()->SetMaxTheta(pi);
  theSingleParticleSource->GetAngDist()->SetMinTheta(halfpi);
}
//
void G4AdjointPrimaryGenerator::SetAdjointPrimarySourceOnAnExtSurfaceOfAVolume(const G4String& volume_name)
{
  theG4AdjointPosOnPhysVolGenerator->DefinePhysicalVolume1(volume_name);
  type_of_adjoint_source ="ExternalSurfaceOfAVolume";
  theSingleParticleSource->GetPosDist()->SetPosDisType("Point");
  theSingleParticleSource->GetAngDist()->SetAngDistType("planar"); 
}

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