vecGeomNavigation/src/VG01PrimaryGeneratorAction.cc

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0025 //
0026 /// \file VG01PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the VG01PrimaryGeneratorAction class
0028
0029 //  Authors: J. Apostolakis & S. Wenzel (CERN)  2018-2021
0030 //
0031 //  Started from FullCMS code by Mihaly Novak (CERN) 2017
0032
0033 #include "VG01PrimaryGeneratorAction.hh"
0034
0035 #include "G4Event.hh"
0036 #include "G4ParticleDefinition.hh"
0037 #include "G4ParticleGun.hh"
0038 #include "G4ParticleTable.hh"
0039 #include "G4RandomDirection.hh"
0040 #include "G4SystemOfUnits.hh"
0041
0042 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0043
0044 VG01PrimaryGeneratorAction::VG01PrimaryGeneratorAction(EGeneratorMode mode)
0045   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fMode(mode)
0046 {
0047   G4int n_particle = 1;
0048   fParticleGun = new G4ParticleGun(n_particle);
0049
0050   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0051   G4String particleName;
0052   fParticleGun->SetParticleDefinition(particleTable->FindParticle(particleName = "geantino"));
0053   fParticleGun->SetParticleEnergy(1.0 * GeV);
0054   fParticleGun->SetParticlePosition(G4ThreeVector(0, 0, 0));  // -1.2*m, 0.1, 0.1));
0055 }
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 VG01PrimaryGeneratorAction::~VG01PrimaryGeneratorAction()
0060 {
0061   delete fParticleGun;
0062 }
0063
0064 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0065
0066 void VG01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0067 {
0068   G4ThreeVector dir(1.0, 0.0, 0.0);
0069
0070   // G4ThreeVector FixedMode[3] =
0071   //  { G4ThreeVector(1,0,0), G4ThreeVector(1,0.1,0), G4ThreeVector( 1, 0, 0.1)};
0072   G4ThreeVector AxisModeVectors[3] = {G4ThreeVector(1, 0, 0), G4ThreeVector(0, 1, 0),
0073                                       G4ThreeVector(0, 0, 1.0)};
0074
0075   if (fMode == kFreeMode) {
0076     // Do not fix the direction
0077     //   -- UI commands to particle mode can change it!
0078     fParticleGun->GeneratePrimaryVertex(anEvent);
0079     return;
0080     //----
0081   }
0082   else if (fMode == kFixedMode) {
0083     G4int i = anEvent->GetEventID() % 3;
0084     dir = G4ThreeVector(1.0, 0.0, 0.0);
0085     switch (i) {
0086       case 0:
0087         break;
0088       case 1:
0089         dir.setY(0.1);
0090         break;
0091       case 2:
0092         dir.setZ(0.1);
0093         break;
0094     }
0095   }
0096   else if (fMode == kUniformMode) {
0097     dir = G4RandomDirection();
0098   }
0099   else if (fMode == kAxisMode) {
0100     G4int i = anEvent->GetEventID() % 3;
0101     dir = AxisModeVectors[i];
0102   }
0103
0104   fParticleGun->SetParticleMomentumDirection(dir);
0105   fParticleGun->GeneratePrimaryVertex(anEvent);
0106 }