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26 //
27 /// \file GB03BOptnSplitOrKillOnBoundary.cc
28 /// \brief Implementation of the GB03BOptnSpli
29
30 #include "GB03BOptnSplitOrKillOnBoundary.hh"
31
32 #include "Randomize.hh"
33
34 //....oooOO0OOooo........oooOO0OOooo........oo
35
36 GB03BOptnSplitOrKillOnBoundary::GB03BOptnSplit
37 : G4VBiasingOperation(name), fParticleChange
38 {}
39
40 //....oooOO0OOooo........oooOO0OOooo........oo
41
42 GB03BOptnSplitOrKillOnBoundary::~GB03BOptnSpli
43
44 //....oooOO0OOooo........oooOO0OOooo........oo
45
46 G4double GB03BOptnSplitOrKillOnBoundary::Dista
47
48 {
49 // -- return "infinite" distance for interac
50 // -- being called anyway at the end of the
51 // -- flag.
52 *condition = Forced;
53 return DBL_MAX;
54 }
55
56 //....oooOO0OOooo........oooOO0OOooo........oo
57
58 G4VParticleChange* GB03BOptnSplitOrKillOnBound
59
60 {
61 // Check if step is limited by the geometry:
62 // to the absorber layer, this volume bounda
63 // (check of current step # of track is inel
64 // that a cloned track can wrongly be seen i
65 // precision issue. In this case it makes a
66 if ((step->GetPostStepPoint()->GetStepStatus
67 && (track->GetCurrentStepNumber() != 1))
68 {
69 // -- Before deciding for killing or split
70 // -- the technique or not:
71 G4double trial = G4UniformRand(); // -- N
72 // -- e
73 if (trial <= fApplyProbability) {
74 // -- Get z component of track, to see i
75 G4double pz = track->GetMomentum().z();
76
77 if (pz > 0.0) {
78 // -----------------------------------
79 // Here, we are moving "forward". We d
80 // -----------------------------------
81
82 // Get track weight:
83 G4double initialWeight = track->GetWei
84 // Define the tracks weight:
85 G4double weightOfTrack = initialWeight
86
87 // The "particle change" is the object
88 // the tracking the update of the prim
89 // secondary tracks.
90 fParticleChange.Initialize(*track);
91
92 // ask currect track weight to be chan
93 fParticleChange.ProposeParentWeight(we
94
95 // Now make clones of this track (this
96 // we will then have the primary and N
97 // splitting by a factor N:
98 fParticleChange.SetNumberOfSecondaries
99 for (G4int iSplit = 1; iSplit < fSplit
100 G4Track* clone = new G4Track(*track)
101 clone->SetWeight(weightOfTrack);
102 fParticleChange.AddSecondary(clone);
103 }
104 fParticleChange.SetSecondaryWeightByPr
105 // -- take it as is ;) [though not nec
106
107 // this new final state is returned to
108 return &fParticleChange;
109 }
110
111 else {
112 // -----------------------------------
113 // Here, we are moving backward. We do
114 // roulette, killing 1/fSplittingFacto
115 // -----------------------------------
116
117 // Get track weight:
118 G4double initialWeight = track->GetWei
119
120 // The "particle change" is the object
121 // the tracking the update of the prim
122 // secondary tracks.
123 fParticleChange.Initialize(*track);
124
125 // Shoot a random number (in ]0,1[ seg
126 G4double random = G4UniformRand();
127
128 // Decide to kill, keeping 1/fSplittin
129 G4double survivingProbability = 1.0 /
130 if (random > survivingProbability) {
131 // We ask for the the track to be ki
132 fParticleChange.ProposeTrackStatus(f
133 }
134 else {
135 // In this case, the track survives.
136 // to conserve weight among killed a
137 fParticleChange.ProposeParentWeight(
138 }
139
140 // this new final state is returned to
141 return &fParticleChange;
142 }
143 } // -- end of : if ( trial > probaForApp
144 } // -- end of : if ( ( step->GetPostStepPo
145 //
146
147 // Here, the step was not limited by the geo
148 // process). We do nothing: ie we make no ch
149 fParticleChangeForNothing.Initialize(*track)
150 return &fParticleChangeForNothing;
151 }
152
153 //....oooOO0OOooo........oooOO0OOooo........oo
154