phonon/src/XPrimaryGeneratorAction.cc

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0026 /// \file exoticphysics/phonon/src/XPrimaryGeneratorAction.cc
0027 /// \brief Implementation of the XPrimaryGeneratorAction class
0028 //
0029 //
0030
0031 #include "XPrimaryGeneratorAction.hh"
0032
0033 #include "G4Event.hh"
0034 #include "G4ParticleGun.hh"
0035 #include "G4PhononLong.hh"
0036 #include "G4PhononTransFast.hh"
0037 #include "G4PhononTransSlow.hh"
0038 #include "G4RandomDirection.hh"
0039 #include "G4SystemOfUnits.hh"
0040
0041 using namespace std;
0042
0043 XPrimaryGeneratorAction::XPrimaryGeneratorAction()
0044 {
0045   G4int n_particle = 1;
0046   fParticleGun = new G4ParticleGun(n_particle);
0047
0048   // default particle kinematic
0049   fParticleGun->SetParticleDefinition(G4PhononLong::PhononDefinition());
0050   fParticleGun->SetParticleMomentumDirection(G4RandomDirection());
0051   fParticleGun->SetParticlePosition(G4ThreeVector(0.0, 0.0, 0.0));
0052   fParticleGun->SetParticleEnergy(1e-4 * eV);
0053 }
0054
0055 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0056
0057 XPrimaryGeneratorAction::~XPrimaryGeneratorAction()
0058 {
0059   delete fParticleGun;
0060 }
0061
0062 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0063
0064 void XPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0065 {
0066   fParticleGun->SetParticleMomentumDirection(G4RandomDirection());
0067
0068   G4double selector = G4UniformRand();
0069   if (selector < 0.53539) {
0070     fParticleGun->SetParticleDefinition(G4PhononTransSlow::PhononDefinition());
0071   }
0072   else if (selector < 0.90217) {
0073     fParticleGun->SetParticleDefinition(G4PhononTransFast::PhononDefinition());
0074   }
0075   else {
0076     fParticleGun->SetParticleDefinition(G4PhononLong::PhononDefinition());
0077   }
0078
0079   // Set phonon energy.
0080   // Do not set momentum direction here.
0081   // Any momentum direction set here will be overwritten
0082   // by XPhononStackingAction::ClassifyNewTrack
0083   fParticleGun->SetParticleEnergy(0.0075 * eV);
0084   fParticleGun->GeneratePrimaryVertex(anEvent);
0085 }
0086
0087 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....