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G4AdjointAlongStepWeightCorrection.cc
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27 #include "G4AdjointAlongStepWeightCorrection.hh"
28 #include "G4Step.hh"
29 #include "G4ParticleDefinition.hh"
30 #include "G4VParticleChange.hh"
31 #include "G4AdjointCSManager.hh"
32 
34 //
35 
36 G4AdjointAlongStepWeightCorrection::G4AdjointAlongStepWeightCorrection(const G4String& name,
37  G4ProcessType type): G4VContinuousProcess(name, type)
38 {fParticleChange = new G4ParticleChange();
39  currentMaterialIndex=0;
40  preStepKinEnergy=1.;
41  currentCouple=0;
42 }
43 
45 //
46 
47 G4AdjointAlongStepWeightCorrection::~G4AdjointAlongStepWeightCorrection()
48 {delete fParticleChange;
49 }
51 //
52 void G4AdjointAlongStepWeightCorrection::PreparePhysicsTable(
53  const G4ParticleDefinition& )
54 {
55 ;
56 }
58 //
59 
60 void G4AdjointAlongStepWeightCorrection::BuildPhysicsTable(const G4ParticleDefinition& )
61 {;
62 }
64 //
65 G4VParticleChange* G4AdjointAlongStepWeightCorrection::AlongStepDoIt(const G4Track& track,
66  const G4Step& step)
67 {
68 
69  fParticleChange->Initialize(track);
70 
71  // Get the actual (true) Step length
72  //----------------------------------
73  G4double length = step.GetStepLength();
74 
75 
76  G4double Tkin = step.GetPostStepPoint()->GetKineticEnergy();
77  G4ParticleDefinition* thePartDef= const_cast<G4ParticleDefinition*> (track.GetDynamicParticle()->GetDefinition());
78  G4double weight_correction=G4AdjointCSManager::GetAdjointCSManager()->GetContinuousWeightCorrection(thePartDef,
79  preStepKinEnergy,Tkin, currentCouple,length);
80 
81 
82 
83 
84  //Caution!!!
85  // It is important to select the weight of the post_step_point
86  // as the current weight and not the weight of the track, as t
87  // the weight of the track is changed after having applied all
88  // the along_step_do_it.
89 
90  // G4double new_weight=weight_correction*track.GetWeight(); //old
91  G4double new_weight=weight_correction*step.GetPostStepPoint()->GetWeight();
92 
93 
94 
95  //if (weight_correction >2.) new_weight=1.e-300;
96 
97 
98  //The following test check for zero weight.
99  //This happens after weight correction of gamma for photo electric effect.
100  //When the new weight is 0 it will be later on consider as nan by G4.
101  //Therefore we do put a lower limit of 1.e-300. for new_weight
102  //Correction by L.Desorgher on 15 July 2009
103  if (new_weight==0 || (new_weight<=0 && new_weight>0)){
104  //G4cout<<new_weight<<'\t'<<weight_correction<<'\t'<<track.GetWeight()<<G4endl;
105  new_weight=1.e-300;
106  }
107 
108  //G4cout<<new_weight<<'\t'<<weight_correction<<'\t'<<track.GetWeight()<<G4endl;
109  fParticleChange->SetParentWeightByProcess(false);
110  fParticleChange->SetSecondaryWeightByProcess(false);
111  fParticleChange->ProposeParentWeight(new_weight);
112 
113 
114  return fParticleChange;
115 
116 }
118 //
119 G4double G4AdjointAlongStepWeightCorrection::GetContinuousStepLimit(const G4Track& track,
120  G4double , G4double , G4double& )
121 {
122  G4double x = DBL_MAX;
123  DefineMaterial(track.GetMaterialCutsCouple());
124  preStepKinEnergy = track.GetKineticEnergy();
125  return x;
126 }