vecGeomNavigation/src/VG01PrimaryGeneratorAction.cc

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0026 //
0027 /// \file VG01PrimaryGeneratorAction.cc
0028 /// \brief Implementation of the VG01PrimaryGeneratorAction class
0029 //
0030 //  Authors: J. Apostolakis & S. Wenzel (CERN)  2018-2021
0031 //
0032 //  Started from FullCMS code by Mihaly Novak (CERN) 2017
0033
0034 #include "VG01PrimaryGeneratorAction.hh"
0035
0036 #include "G4Event.hh"
0037 #include "G4ParticleDefinition.hh"
0038 #include "G4ParticleGun.hh"
0039 #include "G4ParticleTable.hh"
0040 #include "G4RandomDirection.hh"
0041 #include "G4SystemOfUnits.hh"
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044
0045 VG01PrimaryGeneratorAction::VG01PrimaryGeneratorAction(EGeneratorMode mode)
0046   : G4VUserPrimaryGeneratorAction(), fParticleGun(0), fMode(mode)
0047 {
0048   G4int n_particle = 1;
0049   fParticleGun = new G4ParticleGun(n_particle);
0050
0051   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0052   G4String particleName;
0053   fParticleGun->SetParticleDefinition(particleTable->FindParticle(particleName = "geantino"));
0054   fParticleGun->SetParticleEnergy(1.0 * GeV);
0055   fParticleGun->SetParticlePosition(G4ThreeVector(0, 0, 0));  // -1.2*m, 0.1, 0.1));
0056 }
0057
0058 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0059
0060 VG01PrimaryGeneratorAction::~VG01PrimaryGeneratorAction()
0061 {
0062   delete fParticleGun;
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 void VG01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0068 {
0069   G4ThreeVector dir(1.0, 0.0, 0.0);
0070
0071   // G4ThreeVector FixedMode[3] =
0072   //  { G4ThreeVector(1,0,0), G4ThreeVector(1,0.1,0), G4ThreeVector( 1, 0, 0.1)};
0073   G4ThreeVector AxisModeVectors[3] = {G4ThreeVector(1, 0, 0), G4ThreeVector(0, 1, 0),
0074                                       G4ThreeVector(0, 0, 1.0)};
0075
0076   if (fMode == kFreeMode) {
0077     // Do not fix the direction
0078     //   -- UI commands to particle mode can change it!
0079     fParticleGun->GeneratePrimaryVertex(anEvent);
0080     return;
0081     //----
0082   }
0083   else if (fMode == kFixedMode) {
0084     G4int i = anEvent->GetEventID() % 3;
0085     dir = G4ThreeVector(1.0, 0.0, 0.0);
0086     switch (i) {
0087       case 0:
0088         break;
0089       case 1:
0090         dir.setY(0.1);
0091         break;
0092       case 2:
0093         dir.setZ(0.1);
0094         break;
0095     }
0096   }
0097   else if (fMode == kUniformMode) {
0098     dir = G4RandomDirection();
0099   }
0100   else if (fMode == kAxisMode) {
0101     G4int i = anEvent->GetEventID() % 3;
0102     dir = AxisModeVectors[i];
0103   }
0104
0105   fParticleGun->SetParticleMomentumDirection(dir);
0106   fParticleGun->GeneratePrimaryVertex(anEvent);
0107 }