pdb4dna/src/PrimaryGeneratorAction.cc

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0025 //
0026 /// \file PrimaryGeneratorAction.cc
0027 /// \brief Implementation of the PrimaryGeneratorAction class
0028
0029 // This example is provided by the Geant4-DNA collaboration
0030 // Any report or published results obtained using the Geant4-DNA software
0031 // shall cite the following Geant4-DNA collaboration publication:
0032 // Med. Phys. 37 (2010) 4692-4708
0033 // Delage et al. PDB4DNA: implementation of DNA geometry from the Protein Data
0034 //                  Bank (PDB) description for Geant4-DNA Monte-Carlo
0035 //                  simulations (submitted to Comput. Phys. Commun.)
0036 // The Geant4-DNA web site is available at http://geant4-dna.org
0037 //
0038 //
0039
0040 #include "PrimaryGeneratorAction.hh"
0041
0042 #include "G4Box.hh"
0043 #include "G4Event.hh"
0044 #include "G4LogicalVolume.hh"
0045 #include "G4LogicalVolumeStore.hh"
0046 #include "G4ParticleDefinition.hh"
0047 #include "G4ParticleGun.hh"
0048 #include "G4ParticleTable.hh"
0049 #include "G4PhysicalConstants.hh"
0050 #include "G4PhysicalVolumeStore.hh"
0051 #include "G4SystemOfUnits.hh"
0052 #include "Randomize.hh"
0053
0054 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0055
0056 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
0057 {
0058   G4int n_particle = 1;
0059   fpParticleGun = new G4ParticleGun(n_particle);
0060
0061   // default particle kinematic
0062
0063   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0064   fpParticleGun->SetParticleDefinition(particle);
0065   fpParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0066   fpParticleGun->SetParticleEnergy(0.1 * MeV);
0067   fpParticleGun->SetParticlePosition(G4ThreeVector(0. * nm, 0. * nm, 0. * nm));
0068 }
0069
0070 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0071
0072 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0073 {
0074   delete fpParticleGun;
0075 }
0076
0077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0078
0079 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0080 {
0081   // In order to avoid dependence of PrimaryGeneratorAction
0082   // on DetectorConstruction class we get world volume
0083   // from G4LogicalVolumeStore
0084   //
0085   G4double boundXHalfLength = 0;
0086   G4double boundYHalfLength = 0;
0087   G4double boundZHalfLength = 0;
0088
0089   G4VPhysicalVolume* boundPV = G4PhysicalVolumeStore::GetInstance()->GetVolume("boundingPV");
0090
0091   G4ThreeVector boundPos;
0092   if (boundPV) {
0093     boundPos = boundPV->GetTranslation();
0094   }
0095
0096   G4LogicalVolume* boundLV = G4LogicalVolumeStore::GetInstance()->GetVolume("BoundingLV");
0097
0098   G4Box* boundBox = 0;
0099   if (boundLV) {
0100     boundBox = dynamic_cast<G4Box*>(boundLV->GetSolid());
0101   }
0102
0103   if (boundBox) {
0104     boundXHalfLength = boundBox->GetXHalfLength();
0105     boundYHalfLength = boundBox->GetYHalfLength();
0106     boundZHalfLength = boundBox->GetZHalfLength();
0107
0108     // Set gun position
0109     // Select a starting position on a sphere including the target volume
0110     //
0111     G4double radius =
0112       std::sqrt(boundXHalfLength * boundXHalfLength + boundYHalfLength * boundYHalfLength
0113                 + boundZHalfLength * boundZHalfLength);
0114     G4double cosTheta = 2 * G4UniformRand() - 1;
0115     G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
0116     G4double phi = twopi * G4UniformRand();
0117
0118     G4ThreeVector positionStart(boundPos.x() + radius * sinTheta * std::cos(phi),
0119                                 boundPos.y() + radius * sinTheta * std::sin(phi),
0120                                 boundPos.z() + radius * cosTheta);
0121
0122     fpParticleGun->SetParticlePosition(positionStart);
0123
0124     // Set gun direction
0125     // To compute the direction, select a point inside the target volume
0126     //
0127     G4ThreeVector positionDir(boundPos.x() + boundXHalfLength * (2 * G4UniformRand() - 1),
0128                               boundPos.y() + boundYHalfLength * (2 * G4UniformRand() - 1),
0129                               boundPos.z() + boundZHalfLength * (2 * G4UniformRand() - 1));
0130
0131     fpParticleGun->SetParticleMomentumDirection((positionDir - positionStart).unit());
0132   }
0133   else {
0134     G4cerr << "Bounding volume not found." << G4endl;
0135     G4cerr << "Default particle kinematic used" << G4endl;
0136   }
0137
0138   fpParticleGun->GeneratePrimaryVertex(anEvent);
0139 }