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25 //
26 /// \file electromagnetic/TestEm3/src/SteppingAction.cc
27 /// \brief Implementation of the SteppingAction class
28 //
29 //
30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32
33 #include "SteppingAction.hh"
34
35 #include "DetectorConstruction.hh"
36 #include "EventAction.hh"
37 #include "HistoManager.hh"
38 #include "Run.hh"
39
40 #include "G4PhysicalConstants.hh"
41 #include "G4Positron.hh"
42 #include "G4RunManager.hh"
43
44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
45
46 SteppingAction::SteppingAction(DetectorConstruction* det, EventAction* evt)
47 : fDetector(det), fEventAct(evt)
48 {}
49
50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
51
52 void SteppingAction::UserSteppingAction(const G4Step* aStep)
53 {
54 // track informations
55 const G4StepPoint* prePoint = aStep->GetPreStepPoint();
56
57 // if World, return
58 //
59 G4VPhysicalVolume* volume = prePoint->GetTouchableHandle()->GetVolume();
60 // if sum of absorbers do not fill exactly a layer: check material, not volume.
61 const G4Material* mat = volume->GetLogicalVolume()->GetMaterial();
62 if (mat == fDetector->GetWorldMaterial()) return;
63
64 const G4StepPoint* endPoint = aStep->GetPostStepPoint();
65 const G4ParticleDefinition* particle = aStep->GetTrack()->GetDefinition();
66
67 // here we are in an absorber. Locate it
68 //
69 G4int absorNum = prePoint->GetTouchableHandle()->GetCopyNumber(0);
70 G4int layerNum = prePoint->GetTouchableHandle()->GetCopyNumber(1);
71
72 // get Run
73 Run* run = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
74
75 // collect energy deposit taking into account track weight
76 G4double edep = aStep->GetTotalEnergyDeposit() * aStep->GetTrack()->GetWeight();
77
78 // collect step length of charged particles
79 G4double stepl = 0.;
80 if (particle->GetPDGCharge() != 0.) {
81 stepl = aStep->GetStepLength();
82 run->AddChargedStep();
83 }
84 else {
85 run->AddNeutralStep();
86 }
87
88 // G4cout << "Nabs= " << absorNum << " edep(keV)= " << edep << G4endl;
89
90 // sum up per event
91 fEventAct->SumEnergy(absorNum, edep, stepl);
92
93 // longitudinal profile of edep per absorber
94 if (edep > 0.) {
95 G4AnalysisManager::Instance()->FillH1(kMaxAbsor + absorNum, G4double(layerNum + 1), edep);
96 }
97 // energy flow
98 //
99 // unique identificator of layer+absorber
100 G4int Idnow = (fDetector->GetNbOfAbsor()) * layerNum + absorNum;
101 G4int plane;
102 //
103 // leaving the absorber ?
104 if (endPoint->GetStepStatus() == fGeomBoundary) {
105 G4ThreeVector position = endPoint->GetPosition();
106 G4ThreeVector direction = endPoint->GetMomentumDirection();
107 G4double sizeYZ = 0.5 * fDetector->GetCalorSizeYZ();
108 G4double Eflow = endPoint->GetKineticEnergy();
109 if (particle == G4Positron::Positron()) Eflow += 2 * electron_mass_c2;
110 if ((std::abs(position.y()) >= sizeYZ) || (std::abs(position.z()) >= sizeYZ))
111 run->SumLateralEleak(Idnow, Eflow);
112 else if (direction.x() >= 0.)
113 run->SumEnergyFlow(plane = Idnow + 1, Eflow);
114 else
115 run->SumEnergyFlow(plane = Idnow, -Eflow);
116 }
117
118 //// example of Birk attenuation
119 /// G4double destep = aStep->GetTotalEnergyDeposit();
120 /// G4double response = BirksAttenuation(aStep);
121 /// G4cout << " Destep: " << destep/keV << " keV"
122 /// << " response after Birks: " << response/keV << " keV" << G4endl;
123 }
124
125 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
126
127 G4double SteppingAction::BirksAttenuation(const G4Step* aStep)
128 {
129 // Example of Birk attenuation law in organic scintillators.
130 // adapted from Geant3 PHYS337. See MIN 80 (1970) 239-244
131 //
132 const G4Material* material = aStep->GetTrack()->GetMaterial();
133 G4double birk1 = material->GetIonisation()->GetBirksConstant();
134 G4double destep = aStep->GetTotalEnergyDeposit();
135 G4double stepl = aStep->GetStepLength();
136 G4double charge = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
137 //
138 G4double response = destep;
139 if (birk1 * destep * stepl * charge != 0.) {
140 response = destep / (1. + birk1 * destep / stepl);
141 }
142 return response;
143 }
144
145 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
146