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25 // 25 //
>> 26 // $Id$
26 // 27 //
27 /// \file GB04BOptnBremSplitting.cc 28 /// \file GB04BOptnBremSplitting.cc
28 /// \brief Implementation of the GB04BOptnBrem 29 /// \brief Implementation of the GB04BOptnBremSplitting class
29 30
30 #include "GB04BOptnBremSplitting.hh" 31 #include "GB04BOptnBremSplitting.hh"
31 <<
32 #include "G4BiasingProcessInterface.hh" 32 #include "G4BiasingProcessInterface.hh"
>> 33
33 #include "G4ParticleChangeForLoss.hh" 34 #include "G4ParticleChangeForLoss.hh"
34 35
35 //....oooOO0OOooo........oooOO0OOooo........oo 36 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
36 37
37 GB04BOptnBremSplitting::GB04BOptnBremSplitting 38 GB04BOptnBremSplitting::GB04BOptnBremSplitting(G4String name)
38 : G4VBiasingOperation(name), fSplittingFacto << 39 : G4VBiasingOperation(name),
39 {} << 40 fSplittingFactor(1),
>> 41 fParticleChange()
>> 42 {
>> 43 }
40 44
41 //....oooOO0OOooo........oooOO0OOooo........oo 45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
42 46
43 GB04BOptnBremSplitting::~GB04BOptnBremSplittin << 47 GB04BOptnBremSplitting::~GB04BOptnBremSplitting()
>> 48 {
>> 49 }
44 50
45 G4VParticleChange* << 51 G4VParticleChange*
46 GB04BOptnBremSplitting::ApplyFinalStateBiasing << 52 GB04BOptnBremSplitting::
47 << 53 ApplyFinalStateBiasing( const G4BiasingProcessInterface* callingProcess,
>> 54 const G4Track* track,
>> 55 const G4Step* step,
>> 56 G4bool& )
48 { 57 {
>> 58
49 // -- Collect brem. process (wrapped process 59 // -- Collect brem. process (wrapped process) final state:
50 G4VParticleChange* processFinalState = 60 G4VParticleChange* processFinalState =
51 callingProcess->GetWrappedProcess()->PostS 61 callingProcess->GetWrappedProcess()->PostStepDoIt(*track, *step);
52 62
53 // -- if no splitting requested, let the bre 63 // -- if no splitting requested, let the brem. process to return directly its
54 // -- generated final state: 64 // -- generated final state:
55 if (fSplittingFactor == 1) return processFin << 65 if ( fSplittingFactor == 1 ) return processFinalState;
56 66
57 // -- a special case here: the brem. process 67 // -- a special case here: the brem. process corrects for cross-section change
58 // -- over the step due to energy loss by so 68 // -- over the step due to energy loss by sometimes "abandoning" the interaction,
59 // -- returning an unchanged incoming electr 69 // -- returning an unchanged incoming electron/positron.
60 // -- We respect this correction, and if no 70 // -- We respect this correction, and if no secondary is produced, its means this
61 // -- case is happening: 71 // -- case is happening:
62 if (processFinalState->GetNumberOfSecondarie << 72 if ( processFinalState->GetNumberOfSecondaries() == 0 ) return processFinalState;
63 73
64 // -- Now start the biasing: 74 // -- Now start the biasing:
65 // -- - the electron state will be taken a 75 // -- - the electron state will be taken as the first one produced by the brem.
66 // -- process, hence the one stored in a 76 // -- process, hence the one stored in above processFinalState particle change.
67 // -- This state will be stored in our f 77 // -- This state will be stored in our fParticleChange object.
68 // -- - the photon accompagnying the elect 78 // -- - the photon accompagnying the electron will be stored also this way.
69 // -- - we will then do fSplittingFactor - 79 // -- - we will then do fSplittingFactor - 1 call to the brem. process to collect
70 // -- fSplittingFactor - 1 additionnal g 80 // -- fSplittingFactor - 1 additionnal gammas. All these will be stored in our
71 // -- fParticleChange object. 81 // -- fParticleChange object.
72 82
73 // -- We called the brem. process above. Its 83 // -- We called the brem. process above. Its concrete particle change is indeed
74 // -- a "G4ParticleChangeForLoss" object. We 84 // -- a "G4ParticleChangeForLoss" object. We cast this particle change to access
75 // -- methods of the concrete G4ParticleChan 85 // -- methods of the concrete G4ParticleChangeForLoss type:
76 G4ParticleChangeForLoss* actualParticleChang << 86 G4ParticleChangeForLoss* actualParticleChange =
77 << 87 ( G4ParticleChangeForLoss* ) processFinalState ;
>> 88
78 fParticleChange.Initialize(*track); 89 fParticleChange.Initialize(*track);
79 90
80 // -- Store electron final state: 91 // -- Store electron final state:
81 fParticleChange.ProposeTrackStatus(actualPar << 92 fParticleChange.
82 fParticleChange.ProposeEnergy(actualParticle << 93 ProposeTrackStatus ( actualParticleChange->GetTrackStatus() );
83 fParticleChange.ProposeMomentumDirection(act << 94 fParticleChange.
>> 95 ProposeEnergy ( actualParticleChange->GetProposedKineticEnergy() );
>> 96 fParticleChange.
>> 97 ProposeMomentumDirection( actualParticleChange->GetProposedMomentumDirection() );
84 98
85 // -- Now deal with the gamma's: 99 // -- Now deal with the gamma's:
86 // -- their common weight: 100 // -- their common weight:
87 G4double gammaWeight = track->GetWeight() / 101 G4double gammaWeight = track->GetWeight() / fSplittingFactor;
88 << 102
89 // -- inform we will have fSplittingFactor g 103 // -- inform we will have fSplittingFactor gamma's:
90 fParticleChange.SetNumberOfSecondaries(fSpli << 104 fParticleChange.SetNumberOfSecondaries( fSplittingFactor );
91 105
92 // -- inform we take care of secondaries wei 106 // -- inform we take care of secondaries weight (otherwise these
93 // -- secondaries are by default given the p 107 // -- secondaries are by default given the primary weight).
94 fParticleChange.SetSecondaryWeightByProcess( 108 fParticleChange.SetSecondaryWeightByProcess(true);
95 109
96 // -- Store first gamma: 110 // -- Store first gamma:
97 G4Track* gammaTrack = actualParticleChange-> 111 G4Track* gammaTrack = actualParticleChange->GetSecondary(0);
98 gammaTrack->SetWeight(gammaWeight); << 112 gammaTrack->SetWeight( gammaWeight );
99 fParticleChange.AddSecondary(gammaTrack); << 113 fParticleChange.AddSecondary( gammaTrack );
100 // -- and clean-up the brem. process particl 114 // -- and clean-up the brem. process particle change:
101 actualParticleChange->Clear(); 115 actualParticleChange->Clear();
102 116
103 // -- now start the fSplittingFactor-1 calls 117 // -- now start the fSplittingFactor-1 calls to the brem. process to store each
104 // -- related gamma: 118 // -- related gamma:
105 G4int nCalls = 1; 119 G4int nCalls = 1;
106 while (nCalls < fSplittingFactor) { << 120 while ( nCalls < fSplittingFactor )
107 // ( note: we don't need to cast to actual << 121 {
108 // secondary particles are from base cla << 122 // ( note: we don't need to cast to actual type here, as methods for accessing
109 processFinalState = callingProcess->GetWra << 123 // secondary particles are from base class G4VParticleChange )
110 if (processFinalState->GetNumberOfSecondar << 124 processFinalState = callingProcess->GetWrappedProcess()->PostStepDoIt(*track, *step);
111 gammaTrack = processFinalState->GetSecon << 125 if ( processFinalState->GetNumberOfSecondaries() == 1 )
112 gammaTrack->SetWeight(gammaWeight); << 126 {
113 fParticleChange.AddSecondary(gammaTrack) << 127 gammaTrack = processFinalState->GetSecondary(0);
114 nCalls++; << 128 gammaTrack->SetWeight( gammaWeight );
115 } << 129 fParticleChange.AddSecondary( gammaTrack );
116 // -- very rare special case: we ignore fo << 130 nCalls++;
117 else if (processFinalState->GetNumberOfSec << 131 }
118 for (G4int i = 0; i < processFinalState- << 132 // -- very rare special case: we ignore for now.
119 delete processFinalState->GetSecondary << 133 else if ( processFinalState->GetNumberOfSecondaries() > 1 )
>> 134 {
>> 135 for ( G4int i = 0 ; i < processFinalState->GetNumberOfSecondaries() ; i++)
>> 136 delete processFinalState->GetSecondary(i);
>> 137 }
>> 138 processFinalState->Clear();
120 } 139 }
121 processFinalState->Clear(); <<
122 } <<
123 140
124 // -- we are done: 141 // -- we are done:
125 return &fParticleChange; 142 return &fParticleChange;
126 } 143 }
127 144
128 //....oooOO0OOooo........oooOO0OOooo........oo 145 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
129 146