| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
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14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 // This example is provided by the Geant4-DNA collaboration
27 // Any report or published results obtained using the Geant4-DNA software
28 // shall cite the following Geant4-DNA collaboration publication:
29 // Med. Phys. 37 (2010) 4692-4708
30 // Delage et al. PDB4DNA: implementation of DNA geometry from the Protein Data
31 // Bank (PDB) description for Geant4-DNA Monte-Carlo
32 // simulations (submitted to Comput. Phys. Commun.)
33 // The Geant4-DNA web site is available at http://geant4-dna.org
34 //
35 //
36 /// \file PrimaryGeneratorAction.cc
37 /// \brief Implementation of the PrimaryGeneratorAction class
38
39 #include "PrimaryGeneratorAction.hh"
40
41 #include "G4Box.hh"
42 #include "G4Event.hh"
43 #include "G4LogicalVolume.hh"
44 #include "G4LogicalVolumeStore.hh"
45 #include "G4ParticleDefinition.hh"
46 #include "G4ParticleGun.hh"
47 #include "G4ParticleTable.hh"
48 #include "G4PhysicalConstants.hh"
49 #include "G4PhysicalVolumeStore.hh"
50 #include "G4SystemOfUnits.hh"
51 #include "Randomize.hh"
52
53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55 PrimaryGeneratorAction::PrimaryGeneratorAction() : G4VUserPrimaryGeneratorAction()
56 {
57 G4int n_particle = 1;
58 fpParticleGun = new G4ParticleGun(n_particle);
59
60 // default particle kinematic
61
62 G4ParticleDefinition* particle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
63 fpParticleGun->SetParticleDefinition(particle);
64 fpParticleGun->SetParticleMomentumDirection(G4ThreeVector(0., 0., 1.));
65 fpParticleGun->SetParticleEnergy(0.1 * MeV);
66 fpParticleGun->SetParticlePosition(G4ThreeVector(0. * nm, 0. * nm, 0. * nm));
67 }
68
69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70
71 PrimaryGeneratorAction::~PrimaryGeneratorAction()
72 {
73 delete fpParticleGun;
74 }
75
76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
77
78 void PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
79 {
80 // In order to avoid dependence of PrimaryGeneratorAction
81 // on DetectorConstruction class we get world volume
82 // from G4LogicalVolumeStore
83 //
84 G4double boundXHalfLength = 0;
85 G4double boundYHalfLength = 0;
86 G4double boundZHalfLength = 0;
87
88 G4VPhysicalVolume* boundPV = G4PhysicalVolumeStore::GetInstance()->GetVolume("boundingPV");
89
90 G4ThreeVector boundPos;
91 if (boundPV) {
92 boundPos = boundPV->GetTranslation();
93 }
94
95 G4LogicalVolume* boundLV = G4LogicalVolumeStore::GetInstance()->GetVolume("BoundingLV");
96
97 G4Box* boundBox = 0;
98 if (boundLV) {
99 boundBox = dynamic_cast<G4Box*>(boundLV->GetSolid());
100 }
101
102 if (boundBox) {
103 boundXHalfLength = boundBox->GetXHalfLength();
104 boundYHalfLength = boundBox->GetYHalfLength();
105 boundZHalfLength = boundBox->GetZHalfLength();
106
107 // Set gun position
108 // Select a starting position on a sphere including the target volume
109 //
110 G4double radius =
111 std::sqrt(boundXHalfLength * boundXHalfLength + boundYHalfLength * boundYHalfLength
112 + boundZHalfLength * boundZHalfLength);
113 G4double cosTheta = 2 * G4UniformRand() - 1;
114 G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta);
115 G4double phi = twopi * G4UniformRand();
116
117 G4ThreeVector positionStart(boundPos.x() + radius * sinTheta * std::cos(phi),
118 boundPos.y() + radius * sinTheta * std::sin(phi),
119 boundPos.z() + radius * cosTheta);
120
121 fpParticleGun->SetParticlePosition(positionStart);
122
123 // Set gun direction
124 // To compute the direction, select a point inside the target volume
125 //
126 G4ThreeVector positionDir(boundPos.x() + boundXHalfLength * (2 * G4UniformRand() - 1),
127 boundPos.y() + boundYHalfLength * (2 * G4UniformRand() - 1),
128 boundPos.z() + boundZHalfLength * (2 * G4UniformRand() - 1));
129
130 fpParticleGun->SetParticleMomentumDirection((positionDir - positionStart).unit());
131 }
132 else {
133 G4cerr << "Bounding volume not found." << G4endl;
134 G4cerr << "Default particle kinematic used" << G4endl;
135 }
136
137 fpParticleGun->GeneratePrimaryVertex(anEvent);
138 }
139