field01/src/F01PrimaryGeneratorAction.cc

0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 /// \file field/field01/src/F01PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the F01PrimaryGeneratorAction class
0028 //
0029 //
0030 //
0031 //
0032 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0033 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0034
0035 #include "F01PrimaryGeneratorAction.hh"
0036
0037 #include "F01DetectorConstruction.hh"
0038 #include "F01PrimaryGeneratorMessenger.hh"
0039
0040 #include "G4Event.hh"
0041 #include "G4ParticleDefinition.hh"
0042 #include "G4ParticleGun.hh"
0043 #include "G4ParticleTable.hh"
0044 #include "G4PhysicalConstants.hh"
0045 #include "G4SystemOfUnits.hh"
0046 #include "Randomize.hh"
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0049
0050 G4ParticleDefinition* F01PrimaryGeneratorAction::fgPrimaryParticle = nullptr;
0051
0052 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0053
0054 F01PrimaryGeneratorAction::F01PrimaryGeneratorAction(F01DetectorConstruction* det) : fDetector(det)
0055 {
0056   G4int n_particle = 1;
0057   fParticleGun = new G4ParticleGun(n_particle);
0058
0059   // create a messenger for this class
0060   fGunMessenger = new F01PrimaryGeneratorMessenger(this);
0061
0062   // default particle kinematic
0063
0064   G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
0065   G4String particleName;
0066   G4ParticleDefinition* particle = particleTable->FindParticle(particleName = "e-");
0067   fParticleGun->SetParticleDefinition(particle);
0068
0069   fgPrimaryParticle = particle;
0070
0071   fParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., -1.));
0072   fParticleGun->SetParticleEnergy(0.5 * GeV);
0073
0074   fZVertex = fDetector->GetAbsorberZpos() - 0.5 * (fDetector->GetAbsorberThickness());
0075   fParticleGun->SetParticlePosition(G4ThreeVector(fXVertex, fYVertex, fZVertex));
0076 }
0077
0078 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0079
0080 F01PrimaryGeneratorAction::~F01PrimaryGeneratorAction()
0081 {
0082   delete fParticleGun;
0083   delete fGunMessenger;
0084 }
0085
0086 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0087
0088 void F01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0089 {
0090   // this function is called at the begining of event
0091   //
0092   fgPrimaryParticle = fParticleGun->GetParticleDefinition();
0093
0094   G4double x0, y0, z0;
0095   if (fVertexDefined) {
0096     x0 = fXVertex;
0097     y0 = fYVertex;
0098     z0 = fZVertex;
0099   }
0100   else {
0101     x0 = 0.;
0102     y0 = 0.;
0103     z0 = fDetector->GetAbsorberZpos() - 0.5 * (fDetector->GetAbsorberThickness());
0104   }
0105
0106   G4double r0, phi0;
0107   if (fRndmFlag == "on") {
0108     r0 = (fDetector->GetAbsorberRadius()) * std::sqrt(G4UniformRand());
0109     phi0 = twopi * G4UniformRand();
0110     x0 = r0 * std::cos(phi0);
0111     y0 = r0 * std::sin(phi0);
0112   }
0113
0114   fParticleGun->SetParticlePosition(G4ThreeVector(x0, y0, z0));
0115   fParticleGun->GeneratePrimaryVertex(anEvent);
0116 }
0117
0118 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0119
0120 G4String F01PrimaryGeneratorAction::GetPrimaryName()
0121 {
0122   return fgPrimaryParticle->GetParticleName();
0123 }
0124
0125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0126
0127 void F01PrimaryGeneratorAction::SetZVertex(G4double z)
0128 {
0129   fVertexDefined = true;
0130   fZVertex = z;
0131   G4cout << " Z coordinate of the primary vertex = " << fZVertex / mm << " mm." << G4endl;
0132 }
0133
0134 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0135
0136 void F01PrimaryGeneratorAction::SetXVertex(G4double x)
0137 {
0138   fVertexDefined = true;
0139   fXVertex = x;
0140   G4cout << " X coordinate of the primary vertex = " << fXVertex / mm << " mm." << G4endl;
0141 }
0142
0143 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0144
0145 void F01PrimaryGeneratorAction::SetYVertex(G4double y)
0146 {
0147   fVertexDefined = true;
0148   fYVertex = y;
0149   G4cout << " Y coordinate of the primary vertex = " << fYVertex / mm << " mm." << G4endl;
0150 }
0151
0152 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......