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 #include "G4RunManager.hh"
0038
0039 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0040
0041 PrimaryGeneratorAction::PrimaryGeneratorAction()
0042   : G4VUserPrimaryGeneratorAction()
0043 {
0044   fpMessenger = std::make_unique<PrimaryGeneratorMessenger>(this);
0045   fParticleGun = std::make_unique<G4SingleParticleSource>();
0046   G4ParticleDefinition* particle = G4Electron::Definition();
0047   fParticleGun->SetParticleDefinition(particle);
0048   fParticleGun->SetNumberOfParticles(1000000);  // by user
0049
0050   auto pPosDist = fParticleGun->GetPosDist();
0051   pPosDist->SetPosDisType("Plane");
0052   pPosDist->SetPosDisShape("Square");
0053   const auto* fpDetector = dynamic_cast<const DetectorConstruction*>(
0054   G4RunManager::GetRunManager()->GetUserDetectorConstruction());
0055   auto faceSiez = fpDetector->GetChemistryWorld()->GetChemistryBoundary()->halfSideLengthInY();
0056   pPosDist->SetCentreCoords(G4ThreeVector(0, 0, -faceSiez));
0057   pPosDist->SetHalfX(faceSiez);
0058   pPosDist->SetHalfY(faceSiez);
0059
0060   auto pAngleDist = fParticleGun->GetAngDist();
0061   pAngleDist->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0062
0063   auto pEnergyDis = fParticleGun->GetEneDist();
0064   pEnergyDis->SetMonoEnergy(0.9999 * MeV);
0065 }
0066
0067 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
0068
0069 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0070 {
0071   G4ParticleDefinition* particle = fParticleGun->GetParticleDefinition();
0072   auto NumberOfParticlesToBeGenerated = fParticleGun->GetNumberOfParticles();
0073   auto pPosDist = fParticleGun->GetPosDist();
0074   auto pAngleDist = fParticleGun->GetAngDist();
0075   auto pEnDist = fParticleGun->GetEneDist();
0076   auto rnd = fParticleGun->GetBiasRndm();
0077   auto charge = particle->GetPDGCharge();
0078
0079   for (G4int i = 0; i < NumberOfParticlesToBeGenerated; i++) {
0080     auto angle = pAngleDist->GenerateOne();
0081     auto energy = pEnDist->GenerateOne(particle);
0082     auto pos = pPosDist->GenerateOne();
0083     auto mass = particle->GetPDGMass();
0084     auto p = new G4PrimaryParticle(particle);
0085     auto vertex = new G4PrimaryVertex(pos, 0);
0086     p->SetKineticEnergy(energy);
0087     p->SetMass(mass);
0088     p->SetMomentumDirection(angle);
0089     p->SetCharge(charge);
0090     p->SetPolarization(0., 0., 0.);
0091
0092     G4double weight = pEnDist->GetWeight() * rnd->GetBiasWeight();
0093     p->SetWeight(weight);
0094     vertex->SetPrimary(p);
0095     anEvent->AddPrimaryVertex(vertex);
0096   }
0097 }
0098
0099 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....