UHDR/src/PrimaryGeneratorAction.cc

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0025
0026 #include "PrimaryGeneratorAction.hh"
0027
0028 #include "ChemistryWorld.hh"
0029 #include "DetectorConstruction.hh"
0030
0031 #include "G4Electron.hh"
0032 #include "G4Event.hh"
0033 #include "G4ParticleDefinition.hh"
0034 #include "G4ParticleGun.hh"
0035 #include "G4ParticleTable.hh"
0036 #include "G4SystemOfUnits.hh"
0037
0038 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0039
0040 PrimaryGeneratorAction::PrimaryGeneratorAction(DetectorConstruction* pDet)
0041   : G4VUserPrimaryGeneratorAction(), fpDetector(pDet)
0042 {
0043   fpMessenger = std::make_unique<PrimaryGeneratorMessenger>(this);
0044   fParticleGun = std::make_unique<G4SingleParticleSource>();
0045   G4ParticleDefinition* particle = G4Electron::Definition();
0046   fParticleGun->SetParticleDefinition(particle);
0047   fParticleGun->SetNumberOfParticles(1000000);  // by user
0048
0049   auto pPosDist = fParticleGun->GetPosDist();
0050   pPosDist->SetPosDisType("Plane");
0051   pPosDist->SetPosDisShape("Square");
0052   auto faceSiez = fpDetector->GetChemistryWorld()->GetChemistryBoundary()->halfSideLengthInY();
0053   pPosDist->SetCentreCoords(G4ThreeVector(0, 0, -faceSiez));
0054   pPosDist->SetHalfX(faceSiez);
0055   pPosDist->SetHalfY(faceSiez);
0056
0057   auto pAngleDist = fParticleGun->GetAngDist();
0058   pAngleDist->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0059
0060   auto pEnergyDis = fParticleGun->GetEneDist();
0061   pEnergyDis->SetMonoEnergy(0.9999 * MeV);
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0065
0066 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0067 {
0068   G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
0069   auto NumberOfParticlesToBeGenerated = fParticleGun->GetNumberOfParticles();
0070   auto pPosDist = fParticleGun->GetPosDist();
0071   auto pAngleDist = fParticleGun->GetAngDist();
0072   auto pEnDist = fParticleGun->GetEneDist();
0073   auto rnd = fParticleGun->GetBiasRndm();
0074   auto charge = particle->GetPDGCharge();
0075
0076   for (G4int i = 0; i < NumberOfParticlesToBeGenerated; i++) {
0077     auto angle = pAngleDist->GenerateOne();
0078     auto energy = pEnDist->GenerateOne(particle);
0079     auto pos = pPosDist->GenerateOne();
0080     auto mass = particle->GetPDGMass();
0081     auto p = new G4PrimaryParticle(particle);
0082     auto vertex = new G4PrimaryVertex(pos, 0);
0083     p->SetKineticEnergy(energy);
0084     p->SetMass(mass);
0085     p->SetMomentumDirection(angle);
0086     p->SetCharge(charge);
0087     p->SetPolarization(0., 0., 0.);
0088
0089     G4double weight = pEnDist->GetWeight() * rnd->GetBiasWeight();
0090     p->SetWeight(weight);
0091     vertex->SetPrimary(p);
0092     anEvent->AddPrimaryVertex(vertex);
0093   }
0094 }
0095
0096 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....