// Primary event
void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
/*
* To avoid dependence on Detector Construction we will get an envelope volume
* from the G4LogicalVolumeStore
*
* Here we will be assuming our box is sitting in a world where the radiation flux
* is coming from the -x direction. Thus we will have a uniform random start location
* through the YZ plane
*/
G4double envSizeX = 0.;
G4double envSizeYZ = 0.;
if ( !EnvelopeBox )
{
G4LogicalVolume* envLV = G4LogicalVolumeStore::GetInstance() -> GetVolume("World");
if ( envLV ) EnvelopeBox = dynamic_cast<G4Box*>( envLV -> GetSolid() );
}
if ( EnvelopeBox )
{
envSizeYZ = EnvelopeBox -> GetYHalfLength() *2.;
envSizeX = EnvelopeBox -> GetXHalfLength() *2.;
}
else
{
G4ExceptionDescription msg;
msg << "World volume of box shape is not found.\n";
msg << "Perhaps you have changed the geometry.\n";
msg << "\nWhere has the world gone?";
G4Exception("PrimaryGeneratorAction::GeneratePrimaries()","Mycode0001",JustWarning,msg);
}
// We won't use the outer 10% edge
G4double size = 0.9;
// Since we are starting in the -x direction and firing in the x direction we want the
// particles to come uniformly out of the YZ plane
G4double x0 = 0.5 * envSizeX;
G4double y0 = size * envSizeYZ * (G4UniformRand() - 0.5);
G4double z0 = size * envSizeYZ * (G4UniformRand() - 0.5);
particleGun -> SetParticlePosition(G4ThreeVector(-x0,y0,z0));
//particleGun -> SetParticleMomentumDirection(G4ThreeVector(1.0,0.,0.)); // Pure x momentum
particleGun -> GeneratePrimaryVertex(anEvent); // creates the initial momentum
}
G4VParticleChange*
RichG4OpBoundaryProcess::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
{
// I do not know where these guys come, but I kill them explicitly
if(isnan(aTrack.GetPosition()[0]) || isnan(aTrack.GetMomentum()[0])){
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
// Initialization
aParticleChange.Initialize(aTrack);
// Get the properties of the particle
const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
G4double thePhotonMomentum = aParticle->GetTotalMomentum();
G4StepPoint* pPreStepPoint = aStep.GetPreStepPoint();
G4StepPoint* pPostStepPoint = aStep.GetPostStepPoint();
if(isnan(pPreStepPoint->GetPosition()[0])){
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
if (pPostStepPoint->GetStepStatus() != fGeomBoundary){
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
if (aTrack.GetStepLength()<=1e-7){
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
G4Material *Material1 = pPreStepPoint -> GetMaterial();
G4Material *Material2 = pPostStepPoint -> GetMaterial();
// Follow the standard path if not RICH radiator to vacuum transition
if(!(Material1->GetName()==aerogel_name))
return G4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
// return TOFG4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
if(Material2->GetName()==aerogel_name)
return G4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
// return TOFG4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
if(!Material1->GetMaterialPropertiesTable() ||
!Material2->GetMaterialPropertiesTable()){
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
OldMomentum = aParticle->GetMomentumDirection();
OldPolarization = aParticle->GetPolarization();
// Get the normal of the surface
G4ThreeVector theGlobalPoint = pPostStepPoint->GetPosition();
G4Navigator* theNavigator =
G4TransportationManager::GetTransportationManager()->
GetNavigatorForTracking();
G4ThreeVector theLocalPoint = theNavigator->
GetGlobalToLocalTransform().
TransformPoint(theGlobalPoint);
G4ThreeVector theLocalNormal; // Normal points back into volume
G4bool valid;
theLocalNormal = theNavigator->GetLocalExitNormal(&valid);
if (valid) {
theLocalNormal = -theLocalNormal;
}
else {
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
G4cerr << " RichG4OpBoundaryProcess/PostStepDoIt(): "
<< " The Navigator reports that it returned an invalid normal"
<< G4endl;
G4Exception("RichG4OpBoundaryProcess::PostStepDoIt",
"Invalid Surface Normal",
EventMustBeAborted,
"Geometry must return valid surface normal");
// return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
theGlobalNormal = theNavigator->GetLocalToGlobalTransform().
TransformAxis(theLocalNormal);
if (OldMomentum * theGlobalNormal > 0.0) {
theGlobalNormal = -theGlobalNormal;
}
// Get the refractive index
G4ThreeVector position = aTrack.GetPosition();
const G4double cvpwl=1.2398E-6;
G4double wavelength=cvpwl/thePhotonMomentum*GeV;
Rindex1=RichRadiatorTileManager::get_refractive_index(position[0]/cm,position[1]/cm,wavelength);
G4MaterialPropertyVector* Rindex = Material2->GetMaterialPropertiesTable()->GetProperty("RINDEX");
if(!Rindex){
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
#if G4VERSION_NUMBER >945
Rindex2 = Rindex->Value(thePhotonMomentum);
#else
Rindex2 = Rindex->GetProperty(thePhotonMomentum);
#endif
// SKIP photons exiting through the lateral sides of the tiles
if(std::abs(theGlobalNormal[2])<1e-6){
cout <<" g4rich::abs "<<std::abs(theGlobalNormal[2])<<" "<<abs(theGlobalNormal[2])<<" "<<theGlobalNormal[2]<<endl;
return G4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
}
// if(abs(theGlobalNormal[2])<1e-6) return TOFG4OpBoundaryProcess::PostStepDoIt(aTrack,aStep);
DielectricDielectric();
// return G4OpBoundaryProcess::PostStepDoIt(aTrack, aStep); //CJD this solves the f*****g problem
NewMomentum = NewMomentum.unit();
NewPolarization = NewPolarization.unit();
if(Material1->GetName()==aerogel_name){
// Simple parameterization to get the right number of p.e.
if(G4UniformRand()<RICHDB::scatloss){
aParticleChange.ProposeTrackStatus(fStopAndKill);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
// Forward scattering
if(G4UniformRand()<RICHDB::scatprob){
// Aerogel scattering effect
double phi=2*M_PI*G4UniformRand();
double theta=sqrt(-2*log(G4UniformRand()))*RICHDB::scatang;
// Build the vector
G4ThreeVector direction(sin(theta)*cos(phi),sin(theta)*sin(phi),cos(theta));
direction.rotateUz(NewMomentum);
NewMomentum=direction.unit();
}
}
aParticleChange.ProposeMomentumDirection(NewMomentum);
aParticleChange.ProposePolarization(NewPolarization);
return G4VDiscreteProcess::PostStepDoIt(aTrack, aStep);
}
