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Par01PiModel.cc
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31 #include "Par01PiModel.hh"
32 
33 #include "G4PionMinus.hh"
34 #include "G4PionPlus.hh"
35 #include "G4Gamma.hh"
36 
37 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
38 
39 Par01PiModel::Par01PiModel(G4Region *anEnvelope) :
40  G4VFastSimulationModel("Par01PiModel",anEnvelope)
41 {;}
42 
43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
44 
45 Par01PiModel::~Par01PiModel()
46 {;}
47 
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49 
50 G4bool Par01PiModel::IsApplicable(const G4ParticleDefinition& particleType)
51 {
52  return
53  &particleType == G4PionMinus::PionMinusDefinition() ||
54  &particleType == G4PionPlus::PionPlusDefinition();
55 }
56 
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58 
59 G4bool Par01PiModel::ModelTrigger(const G4FastTrack& fastTrack) {
60  //-------------------------------------------------------------
61  // UserTrigger() method: method which has to decide if
62  // the parameterisation has to be applied.
63  // Here ModelTrigger() asks the user (ie you) a 0/1 answer.
64  //
65  // Note that quantities like the local/global position/direction etc..
66  // are available at this level via the fastTrack parameter (allowing
67  // to check distance from boundaries, see below to allow the decision)
68  //--------------------------------------------------------------
69  G4cout << "\nPar01PiModel::ModelTrigger() called:" << G4endl;
70  G4cout << "--------------------------------" << G4endl;
71  G4cout << "(particle is a " << fastTrack.GetPrimaryTrack()->
72  GetDefinition()->GetParticleName() << " )\n" << G4endl;
73 
74  // -- Examples of available informations:
75 
76  // -- position:
77  G4cout << " Track position: " <<
78  fastTrack.GetPrimaryTrack()->GetPosition() << "(global coord.)" <<
79  fastTrack.GetPrimaryTrackLocalPosition() << "(in envelope coord.)"
80  << G4endl;
81 
82  // -- direction:
83  G4cout << " Track direction:" <<
84  fastTrack.GetPrimaryTrack()->GetMomentum().unit() <<
85  "(global coord.)" <<
86  fastTrack.GetPrimaryTrackLocalDirection() << "(in envelope coord.)" <<
87  G4endl;
88 
89  return true;
90 }
91 
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93 
94 void Par01PiModel::DoIt(const G4FastTrack& fastTrack,
95  G4FastStep& fastStep)
96  //--------------------------------------------------------
97  //
98  // User method to code the parameterisation properly said.
99  //
100  //--------------------------------------------------------
101 {
102 
103  //------------------------------------------------
104  // The primary track continues along its direction.
105  // One secondary (a photon) is added:
106  //------------------------------------------------
107  G4cout << " Pion `model' applied\n" << G4endl;
108 
109  //------------------------------
110  // Primary:
111  // idem as in "DefaultModel":
112  //
113  //------------------------------
114  G4ThreeVector position;
115  G4double distance;
116  distance = fastTrack.GetEnvelopeSolid()->
117  DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
118  fastTrack.GetPrimaryTrackLocalDirection());
119  position = fastTrack.GetPrimaryTrackLocalPosition() +
120  distance*fastTrack.GetPrimaryTrackLocalDirection();
121 
122  // -- set final position:
123  fastStep.ProposePrimaryTrackFinalPosition(position);
124 
125  //---------------------------
126  // Secondary:
127  // Adds one "secondary":
128  //---------------------------
129  // -- First, user has to say how many secondaries will be created:
130  fastStep.SetNumberOfSecondaryTracks(1);
131 
132  //------------------------
133  // -- Build the secondary:
134  //------------------------
135  // -- direction:
136  G4ParticleMomentum direction(fastTrack.GetPrimaryTrackLocalDirection());
137  direction.setZ(direction.z()*0.5);
138  direction.setY(direction.y()+direction.z()*0.1);
139  direction = direction.unit(); // necessary ?
140 
141  // -- dynamics (Note that many constructors exists for G4DynamicParticle
142  // -- see prototype/particle+matter/particles/management/include/G4DynamicParticle.hh)
143  G4DynamicParticle dynamique(G4Gamma::GammaDefinition(),
144  direction,
145  fastTrack.GetPrimaryTrack()->
146  GetKineticEnergy()/2.);
147  // -- position:
148  G4double Dist;
149  Dist = fastTrack.GetEnvelopeSolid()->
150  DistanceToOut(fastTrack.GetPrimaryTrackLocalPosition(),
151  direction);
152  G4ThreeVector posi;
153  posi = fastTrack.GetPrimaryTrackLocalPosition() + Dist*direction;
154 
155  //------------------------------------
156  //-- Creation of the secondary Track:
157  //------------------------------------
158  fastStep.CreateSecondaryTrack(dynamique, posi,
159  fastTrack.GetPrimaryTrack()->GetGlobalTime());
160 }