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25 //
26 /// \file 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 "G4RunManager.hh"
41
42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
43
44 SteppingAction::SteppingAction(DetectorConstruction* det, EventAction* evt)
45 : fDetector(det), fEventAct(evt)
46 {}
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49
50 void SteppingAction::UserSteppingAction(const G4Step* aStep)
51 {
52 // count processes
53 //
54 const G4StepPoint* prePoint = aStep->GetPreStepPoint();
55 const G4StepPoint* endPoint = aStep->GetPostStepPoint();
56 const G4VProcess* process = endPoint->GetProcessDefinedStep();
57 Run* run = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
58 run->CountProcesses(process);
59
60 // if World, return
61 //
62 G4VPhysicalVolume* volume = prePoint->GetTouchableHandle()->GetVolume();
63 // if sum of absorbers do not fill exactly a layer: check material, not volume.
64 const G4Material* mat = volume->GetLogicalVolume()->GetMaterial();
65 if (mat == fDetector->GetWorldMaterial()) return;
66
67 const G4ParticleDefinition* particle = aStep->GetTrack()->GetDefinition();
68
69 // here we are in an absorber. Locate it
70 //
71 G4int absorNum = prePoint->GetTouchableHandle()->GetCopyNumber(0);
72 G4int layerNum = prePoint->GetTouchableHandle()->GetCopyNumber(1);
73
74 // collect energy deposit (taking into account track weight)
75 G4double edep = aStep->GetTotalEnergyDeposit();
76 ////edep *= (aStep->GetTrack()->GetWeight());
77
78 // collect step length of charged particles
79 G4double stepl = 0.;
80 if (particle->GetPDGCharge() != 0.) stepl = aStep->GetStepLength();
81
82 // sum up per event
83 fEventAct->SumEnergy(absorNum, edep, stepl);
84
85 // longitudinal profile of edep per absorber
86 if (edep > 0.) {
87 G4AnalysisManager::Instance()->FillH1(kMaxAbsor + absorNum, G4double(layerNum + 1), edep);
88 }
89
90 // energy flow
91 //
92 // unique identificator of layer+absorber
93 G4int Idnow = (fDetector->GetNbOfAbsor()) * layerNum + absorNum;
94 G4int plane;
95 //
96 // leaving the absorber ?
97 if (endPoint->GetStepStatus() == fGeomBoundary) {
98 G4ThreeVector position = endPoint->GetPosition();
99 G4ThreeVector direction = endPoint->GetMomentumDirection();
100 G4double Eflow = endPoint->GetKineticEnergy();
101 if (direction.x() >= 0.)
102 run->SumEnergyFlow(plane = Idnow + 1, Eflow);
103 else
104 run->SumEnergyFlow(plane = Idnow, -Eflow);
105 }
106
107 //// example of Birk attenuation
108 /// G4double destep = aStep->GetTotalEnergyDeposit();
109 /// G4double response = BirksAttenuation(aStep);
110 /// G4cout << " Destep: " << destep/keV << " keV"
111 /// << " response after Birks: " << response/keV << " keV" << G4endl;
112 }
113
114 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
115
116 G4double SteppingAction::BirksAttenuation(const G4Step* aStep)
117 {
118 // Example of Birk attenuation law in organic scintillators.
119 // adapted from Geant3 PHYS337. See MIN 80 (1970) 239-244
120 //
121 const G4Material* material = aStep->GetTrack()->GetMaterial();
122 G4double birk1 = material->GetIonisation()->GetBirksConstant();
123 G4double destep = aStep->GetTotalEnergyDeposit();
124 G4double stepl = aStep->GetStepLength();
125 G4double charge = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
126 //
127 G4double response = destep;
128 if (birk1 * destep * stepl * charge != 0.) {
129 response = destep / (1. + birk1 * destep / stepl);
130 }
131 return response;
132 }
133
134 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
135