| Geant4 Cross Reference |
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25 //
26 //
27 //
28
29 #include "FlashPrimaryGeneratorAction.hh"
30 #include "G4SystemOfUnits.hh"
31
32 #include "G4Event.hh"
33 #include "G4GeneralParticleSource.hh"
34 #include "G4ParticleDefinition.hh"
35 #include "G4ParticleGun.hh"
36 #include "G4ParticleTable.hh"
37 #include "Randomize.hh"
38 #include "globals.hh"
39
40 FlashPrimaryGeneratorAction::FlashPrimaryGeneratorAction() {
41
42 particleGun = new G4GeneralParticleSource();
43
44 SetDefaultPrimaryParticle();
45 }
46
47 FlashPrimaryGeneratorAction::~FlashPrimaryGeneratorAction() {
48 delete particleGun;
49 }
50
51 void FlashPrimaryGeneratorAction::SetDefaultPrimaryParticle() {
52
53 G4ParticleTable *particleTable = G4ParticleTable::GetParticleTable();
54 G4ParticleDefinition *particle = particleTable->FindParticle("e-");
55 particleGun->SetParticleDefinition(particle);
56
57
58 G4double defaultX0 = -113 * cm; //the beam propagates in the x direction from x=-100cm
59
60 X0 = defaultX0;
61
62 G4double defaultY0 = 0.0 * mm;
63 Y0 = defaultY0;
64
65 G4double defaultZ0 = 0.0 * mm;
66 Z0 = defaultZ0;
67
68 G4double defaultsigmaY = 2.5*mm;
69
70 sigmaY = defaultsigmaY;
71
72 G4double defaultsigmaZ = 2.5*mm;
73
74 sigmaZ = defaultsigmaZ;
75
76 G4double defaultTheta = 2 * deg;
77
78 Theta = defaultTheta;
79 }
80
81 void FlashPrimaryGeneratorAction::GeneratePrimaries(G4Event *anEvent) {
82
83 //Energy is defined in 9MeVEF.mac and 7MeVEF.mac for the 9 MeV and 7 MeV spectrum respectively
84
85 G4double x = X0;//the beam has a gaussian shape
86 G4double y = Y0;
87 G4double z = Z0;
88
89 if (sigmaY > 0.0) {
90 y += G4RandGauss::shoot(Y0, sigmaY);
91 }
92
93 if (sigmaZ > 0.0) {
94 z += G4RandGauss::shoot(Z0, sigmaZ);
95 }
96
97 particleGun->GetCurrentSource()->GetPosDist()->SetCentreCoords(G4ThreeVector(x, y, z));
98
99 particleGun->GetCurrentSource()->GetAngDist()->SetAngDistType("beam2d"); //define angular divergence
100 particleGun->GetCurrentSource()->GetAngDist()->DefineAngRefAxes("angref1", G4ThreeVector( 0, 0,1.));//define reference axis for divergence
101
102 particleGun->GetCurrentSource()->GetAngDist()->SetBeamSigmaInAngX(Theta);//set planar divergence
103 particleGun->GetCurrentSource()->GetAngDist()->SetBeamSigmaInAngY(Theta);//set planar divergence
104 particleGun->GetCurrentSource()->GetAngDist()->SetParticleMomentumDirection(G4ThreeVector(1,0,0));//beam propagates in the x direction
105
106 particleGun->GeneratePrimaryVertex(anEvent);
107 }
108