pdb4dna/src/PrimaryGeneratorAction.cc

0001 //
0002 // ********************************************************************
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0024 // ********************************************************************
0025 //
0026 // This example is provided by the Geant4-DNA collaboration
0027 // Any report or published results obtained using the Geant4-DNA software
0028 // shall cite the following Geant4-DNA collaboration publication:
0029 // Med. Phys. 37 (2010) 4692-4708
0030 // Delage et al. PDB4DNA: implementation of DNA geometry from the Protein Data
0031 //                  Bank (PDB) description for Geant4-DNA Monte-Carlo
0032 //                  simulations (submitted to Comput. Phys. Commun.)
0033 // The Geant4-DNA web site is available at http://geant4-dna.org
0034 //
0035 //
0036 /// \file PrimaryGeneratorAction.cc
0037 /// \brief Implementation of the PrimaryGeneratorAction class
0038
0039 #include "PrimaryGeneratorAction.hh"
0040
0041 #include "G4Box.hh"
0042 #include "G4Event.hh"
0043 #include "G4LogicalVolume.hh"
0044 #include "G4LogicalVolumeStore.hh"
0045 #include "G4ParticleDefinition.hh"
0046 #include "G4ParticleGun.hh"
0047 #include "G4ParticleTable.hh"
0048 #include "G4PhysicalConstants.hh"
0049 #include "G4PhysicalVolumeStore.hh"
0050 #include "G4SystemOfUnits.hh"
0051 #include "Randomize.hh"
0052
0053 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0054
0055 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
0056 {
0057   G4int n_particle = 1;
0058   fpParticleGun = new G4ParticleGun(n_particle);
0059
0060   // default particle kinematic
0061
0062   G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
0063   fpParticleGun->SetParticleDefinition(particle);
0064   fpParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
0065   fpParticleGun->SetParticleEnergy(0.1 * MeV);
0066   fpParticleGun->SetParticlePosition(G4ThreeVector(0. * nm, 0. * nm, 0. * nm));
0067 }
0068
0069 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0070
0071 PrimaryGeneratorAction::~PrimaryGeneratorAction()
0072 {
0073   delete fpParticleGun;
0074 }
0075
0076 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0077
0078 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
0079 {
0080   // In order to avoid dependence of PrimaryGeneratorAction
0081   // on DetectorConstruction class we get world volume
0082   // from G4LogicalVolumeStore
0083   //
0084   G4double boundXHalfLength = 0;
0085   G4double boundYHalfLength = 0;
0086   G4double boundZHalfLength = 0;
0087
0088   G4VPhysicalVolume* boundPV = G4PhysicalVolumeStore::GetInstance()->GetVolume("boundingPV");
0089
0090   G4ThreeVector boundPos;
0091   if (boundPV) {
0092     boundPos = boundPV->GetTranslation();
0093   }
0094
0095   G4LogicalVolume* boundLV = G4LogicalVolumeStore::GetInstance()->GetVolume("BoundingLV");
0096
0097   G4Box* boundBox = 0;
0098   if (boundLV) {
0099     boundBox = dynamic_cast<G4Box*>(boundLV->GetSolid());
0100   }
0101
0102   if (boundBox) {
0103     boundXHalfLength = boundBox->GetXHalfLength();
0104     boundYHalfLength = boundBox->GetYHalfLength();
0105     boundZHalfLength = boundBox->GetZHalfLength();
0106
0107     // Set gun position
0108     // Select a starting position on a sphere including the target volume
0109     //
0110     G4double radius =
0111       std::sqrt(boundXHalfLength * boundXHalfLength + boundYHalfLength * boundYHalfLength
0112                 + boundZHalfLength * boundZHalfLength);
0113     G4double cosTheta = 2 * G4UniformRand() - 1;
0114     G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
0115     G4double phi = twopi * G4UniformRand();
0116
0117     G4ThreeVector positionStart(boundPos.x() + radius * sinTheta * std::cos(phi),
0118                                 boundPos.y() + radius * sinTheta * std::sin(phi),
0119                                 boundPos.z() + radius * cosTheta);
0120
0121     fpParticleGun->SetParticlePosition(positionStart);
0122
0123     // Set gun direction
0124     // To compute the direction, select a point inside the target volume
0125     //
0126     G4ThreeVector positionDir(boundPos.x() + boundXHalfLength * (2 * G4UniformRand() - 1),
0127                               boundPos.y() + boundYHalfLength * (2 * G4UniformRand() - 1),
0128                               boundPos.z() + boundZHalfLength * (2 * G4UniformRand() - 1));
0129
0130     fpParticleGun->SetParticleMomentumDirection((positionDir - positionStart).unit());
0131   }
0132   else {
0133     G4cerr << "Bounding volume not found." << G4endl;
0134     G4cerr << "Default particle kinematic used" << G4endl;
0135   }
0136
0137   fpParticleGun->GeneratePrimaryVertex(anEvent);
0138 }