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26 // 26 //
27 /// \file GB04BOptnBremSplitting.cc 27 /// \file GB04BOptnBremSplitting.cc
28 /// \brief Implementation of the GB04BOptnBrem 28 /// \brief Implementation of the GB04BOptnBremSplitting class
29 29
30 #include "GB04BOptnBremSplitting.hh" 30 #include "GB04BOptnBremSplitting.hh"
31 <<
32 #include "G4BiasingProcessInterface.hh" 31 #include "G4BiasingProcessInterface.hh"
>> 32
33 #include "G4ParticleChangeForLoss.hh" 33 #include "G4ParticleChangeForLoss.hh"
34 34
35 //....oooOO0OOooo........oooOO0OOooo........oo 35 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
36 36
37 GB04BOptnBremSplitting::GB04BOptnBremSplitting 37 GB04BOptnBremSplitting::GB04BOptnBremSplitting(G4String name)
38 : G4VBiasingOperation(name), fSplittingFacto << 38 : G4VBiasingOperation(name),
39 {} << 39 fSplittingFactor(1),
>> 40 fParticleChange()
>> 41 {
>> 42 }
40 43
41 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
42 45
43 GB04BOptnBremSplitting::~GB04BOptnBremSplittin << 46 GB04BOptnBremSplitting::~GB04BOptnBremSplitting()
>> 47 {
>> 48 }
44 49
45 G4VParticleChange* << 50 G4VParticleChange*
46 GB04BOptnBremSplitting::ApplyFinalStateBiasing << 51 GB04BOptnBremSplitting::
47 << 52 ApplyFinalStateBiasing( const G4BiasingProcessInterface* callingProcess,
>> 53 const G4Track* track,
>> 54 const G4Step* step,
>> 55 G4bool& )
48 { 56 {
>> 57
49 // -- Collect brem. process (wrapped process 58 // -- Collect brem. process (wrapped process) final state:
50 G4VParticleChange* processFinalState = 59 G4VParticleChange* processFinalState =
51 callingProcess->GetWrappedProcess()->PostS 60 callingProcess->GetWrappedProcess()->PostStepDoIt(*track, *step);
52 61
53 // -- if no splitting requested, let the bre 62 // -- if no splitting requested, let the brem. process to return directly its
54 // -- generated final state: 63 // -- generated final state:
55 if (fSplittingFactor == 1) return processFin << 64 if ( fSplittingFactor == 1 ) return processFinalState;
56 65
57 // -- a special case here: the brem. process 66 // -- a special case here: the brem. process corrects for cross-section change
58 // -- over the step due to energy loss by so 67 // -- over the step due to energy loss by sometimes "abandoning" the interaction,
59 // -- returning an unchanged incoming electr 68 // -- returning an unchanged incoming electron/positron.
60 // -- We respect this correction, and if no 69 // -- We respect this correction, and if no secondary is produced, its means this
61 // -- case is happening: 70 // -- case is happening:
62 if (processFinalState->GetNumberOfSecondarie << 71 if ( processFinalState->GetNumberOfSecondaries() == 0 ) return processFinalState;
63 72
64 // -- Now start the biasing: 73 // -- Now start the biasing:
65 // -- - the electron state will be taken a 74 // -- - the electron state will be taken as the first one produced by the brem.
66 // -- process, hence the one stored in a 75 // -- process, hence the one stored in above processFinalState particle change.
67 // -- This state will be stored in our f 76 // -- This state will be stored in our fParticleChange object.
68 // -- - the photon accompagnying the elect 77 // -- - the photon accompagnying the electron will be stored also this way.
69 // -- - we will then do fSplittingFactor - 78 // -- - we will then do fSplittingFactor - 1 call to the brem. process to collect
70 // -- fSplittingFactor - 1 additionnal g 79 // -- fSplittingFactor - 1 additionnal gammas. All these will be stored in our
71 // -- fParticleChange object. 80 // -- fParticleChange object.
72 81
73 // -- We called the brem. process above. Its 82 // -- We called the brem. process above. Its concrete particle change is indeed
74 // -- a "G4ParticleChangeForLoss" object. We 83 // -- a "G4ParticleChangeForLoss" object. We cast this particle change to access
75 // -- methods of the concrete G4ParticleChan 84 // -- methods of the concrete G4ParticleChangeForLoss type:
76 G4ParticleChangeForLoss* actualParticleChang << 85 G4ParticleChangeForLoss* actualParticleChange =
77 << 86 ( G4ParticleChangeForLoss* ) processFinalState ;
>> 87
78 fParticleChange.Initialize(*track); 88 fParticleChange.Initialize(*track);
79 89
80 // -- Store electron final state: 90 // -- Store electron final state:
81 fParticleChange.ProposeTrackStatus(actualPar << 91 fParticleChange.
82 fParticleChange.ProposeEnergy(actualParticle << 92 ProposeTrackStatus ( actualParticleChange->GetTrackStatus() );
83 fParticleChange.ProposeMomentumDirection(act << 93 fParticleChange.
>> 94 ProposeEnergy ( actualParticleChange->GetProposedKineticEnergy() );
>> 95 fParticleChange.
>> 96 ProposeMomentumDirection( actualParticleChange->GetProposedMomentumDirection() );
84 97
85 // -- Now deal with the gamma's: 98 // -- Now deal with the gamma's:
86 // -- their common weight: 99 // -- their common weight:
87 G4double gammaWeight = track->GetWeight() / 100 G4double gammaWeight = track->GetWeight() / fSplittingFactor;
88 << 101
89 // -- inform we will have fSplittingFactor g 102 // -- inform we will have fSplittingFactor gamma's:
90 fParticleChange.SetNumberOfSecondaries(fSpli << 103 fParticleChange.SetNumberOfSecondaries( fSplittingFactor );
91 104
92 // -- inform we take care of secondaries wei 105 // -- inform we take care of secondaries weight (otherwise these
93 // -- secondaries are by default given the p 106 // -- secondaries are by default given the primary weight).
94 fParticleChange.SetSecondaryWeightByProcess( 107 fParticleChange.SetSecondaryWeightByProcess(true);
95 108
96 // -- Store first gamma: 109 // -- Store first gamma:
97 G4Track* gammaTrack = actualParticleChange-> 110 G4Track* gammaTrack = actualParticleChange->GetSecondary(0);
98 gammaTrack->SetWeight(gammaWeight); << 111 gammaTrack->SetWeight( gammaWeight );
99 fParticleChange.AddSecondary(gammaTrack); << 112 fParticleChange.AddSecondary( gammaTrack );
100 // -- and clean-up the brem. process particl 113 // -- and clean-up the brem. process particle change:
101 actualParticleChange->Clear(); 114 actualParticleChange->Clear();
102 115
103 // -- now start the fSplittingFactor-1 calls 116 // -- now start the fSplittingFactor-1 calls to the brem. process to store each
104 // -- related gamma: 117 // -- related gamma:
105 G4int nCalls = 1; 118 G4int nCalls = 1;
106 while (nCalls < fSplittingFactor) { << 119 while ( nCalls < fSplittingFactor )
107 // ( note: we don't need to cast to actual << 120 {
108 // secondary particles are from base cla << 121 // ( note: we don't need to cast to actual type here, as methods for accessing
109 processFinalState = callingProcess->GetWra << 122 // secondary particles are from base class G4VParticleChange )
110 if (processFinalState->GetNumberOfSecondar << 123 processFinalState = callingProcess->GetWrappedProcess()->PostStepDoIt(*track, *step);
111 gammaTrack = processFinalState->GetSecon << 124 if ( processFinalState->GetNumberOfSecondaries() == 1 )
112 gammaTrack->SetWeight(gammaWeight); << 125 {
113 fParticleChange.AddSecondary(gammaTrack) << 126 gammaTrack = processFinalState->GetSecondary(0);
114 nCalls++; << 127 gammaTrack->SetWeight( gammaWeight );
115 } << 128 fParticleChange.AddSecondary( gammaTrack );
116 // -- very rare special case: we ignore fo << 129 nCalls++;
117 else if (processFinalState->GetNumberOfSec << 130 }
118 for (G4int i = 0; i < processFinalState- << 131 // -- very rare special case: we ignore for now.
119 delete processFinalState->GetSecondary << 132 else if ( processFinalState->GetNumberOfSecondaries() > 1 )
>> 133 {
>> 134 for ( G4int i = 0 ; i < processFinalState->GetNumberOfSecondaries() ; i++)
>> 135 delete processFinalState->GetSecondary(i);
>> 136 }
>> 137 processFinalState->Clear();
120 } 138 }
121 processFinalState->Clear(); <<
122 } <<
123 139
124 // -- we are done: 140 // -- we are done:
125 return &fParticleChange; 141 return &fParticleChange;
126 } 142 }
127 143
128 //....oooOO0OOooo........oooOO0OOooo........oo 144 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
129 145