Geant4  9.6.p02
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MicrobeamPrimaryGeneratorAction.cc
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26 // -------------------------------------------------------------------
27 // $Id$
28 // -------------------------------------------------------------------
29 
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31 
32 #include "G4SystemOfUnits.hh"
33 #include "G4Event.hh"
34 #include "G4ParticleTable.hh"
35 #include "Randomize.hh"
36 
37 #include "MicrobeamPrimaryGeneratorAction.hh"
38 #include "MicrobeamDetectorConstruction.hh"
39 
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41 
42 MicrobeamPrimaryGeneratorAction::MicrobeamPrimaryGeneratorAction(MicrobeamDetectorConstruction* DC)
43  :Detector(DC)
44 {
45  particleGun = new G4ParticleGun(1);
46 }
47 
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49 
50 MicrobeamPrimaryGeneratorAction::~MicrobeamPrimaryGeneratorAction()
51 {
52  delete particleGun;
53 }
54 
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56 
57 void MicrobeamPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
58 {
59  G4int numEvent;
60  numEvent=anEvent->GetEventID()+1;
61  G4double x0,y0,z0,theta,phi,xMom0,yMom0,zMom0,e0;
62 
63  // INITIAL BEAM POSITION
64 
65  z0=-10000*mm;
66  x0=10*mm;
67  y0=10*mm;
68 
69  G4double sizeMax = 0.5*micrometer; // INITIAL BEAM POSITION UNIFORMLY SPREAD ON A DISK
70  while (! (std::sqrt(x0*x0+y0*y0)<= sizeMax) )
71  {
72  x0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax);
73  y0 = CLHEP::RandFlat::shoot(-sizeMax,sizeMax);
74  }
75 
76  // INITIAL BEAM ENERGY
77 
78  e0= G4RandGauss::shoot(3*MeV,5.0955e-5*MeV); // AIFIRA ENERGY RESOLUTION
79 
80  // INITIAL BEAM DIVERGENCE
81 
82  do {
83  theta=std::acos(1-G4UniformRand()*(1.0-std::cos(1.1e-6)))*rad;
84  }
85  while(theta>1.1e-6*rad);
86 
87  phi=CLHEP::twopi*G4UniformRand()*rad;
88 
89  xMom0=std::sin(theta)*std::cos(phi);
90  yMom0=std::sin(theta)*std::sin(phi);
91  zMom0=std::cos(theta);
92 
93  // VERBOSE
94 
95  G4cout
96  << "-> Event # " << numEvent
97  << " generated "
98  << G4endl;
99 
100 /*
101  G4cout
102  << "-> Event # " << numEvent
103  << " : THETA from Z axis (mrad) = " << theta*1000
104  << " -- PHI (deg) = " << phi*180/CLHEP::pi
105  << " -- x0 (um) = " << x0/micrometer
106  << " -- y0 (um) = " << y0/micrometer
107  << " -- z0 (m) = " << z0/m
108  << " -- e0 (MeV) = " << e0/MeV
109  << G4endl;
110 */
111 
112  particleGun->SetParticleEnergy(e0);
113 
114  particleGun->SetParticleMomentumDirection(G4ThreeVector(xMom0,yMom0,zMom0));
115 
116  particleGun->SetParticlePosition(G4ThreeVector(x0,y0,z0));
117 
118  G4ParticleDefinition* particle=
119  G4ParticleTable::GetParticleTable()->FindParticle("alpha");
120 
121  particleGun->SetParticleDefinition(particle);
122 
123  particleGun->GeneratePrimaryVertex(anEvent);
124 
125 }
126 
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128 
129 
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