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SteppingAction.cc
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29 
30 #include "SteppingAction.hh"
31 
32 #include "DetectorConstruction.hh"
33 #include "EventAction.hh"
34 
35 #include "G4Step.hh"
36 
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38 
39 SteppingAction::SteppingAction(DetectorConstruction* det, EventAction* evt)
40 :G4UserSteppingAction(),detector(det),eventAct(evt)
41 {
42  first = true;
43  lvol_world = lvol_module = lvol_layer = lvol_fiber = 0;
44 }
45 
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47 
48 SteppingAction::~SteppingAction()
49 {}
50 
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52 
53 void SteppingAction::UserSteppingAction(const G4Step* step )
54 {
55  //some initialisation
56  //
57  if (first) {
58  lvol_world = detector->GetLvolWorld();
59  lvol_module = detector->GetLvolModule();
60  lvol_layer = detector->GetLvolLayer();
61  lvol_fiber = detector->GetLvolFiber();
62  first = false;
63  }
64 
65  //if no edep, return
66  //
67  G4double edep = step->GetTotalEnergyDeposit();
69 
70  //locate point in geometry
71  //
72  G4int iModule = 0;
73  G4int iLayer = 0;
74  G4int iFiber = 0;
75 
76  G4TouchableHandle touch1 = step->GetPreStepPoint()->GetTouchableHandle();
77  G4LogicalVolume* lvol = touch1->GetVolume()->GetLogicalVolume();
78 
79  if (lvol == lvol_world) return;
80  else if (lvol == lvol_module) { iModule = touch1->GetCopyNumber(0);}
81  else if (lvol == lvol_layer) { iLayer = touch1->GetCopyNumber(0);
82  iModule = touch1->GetCopyNumber(1);}
83  else if (lvol == lvol_fiber) { iFiber = touch1->GetCopyNumber(0);
84  iLayer = touch1->GetCopyNumber(1);
85  iModule = touch1->GetCopyNumber(2);}
86 
87  // sum edep
88  //
89  eventAct->SumDeStep(iModule, iLayer, iFiber, edep);
90 }
91 
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93 
94 G4double SteppingAction::BirksAttenuation(const G4Step* aStep)
95 {
96  //Example of Birk attenuation law in organic scintillators.
97  //adapted from Geant3 PHYS337. See MIN 80 (1970) 239-244
98  //
99  G4Material* material = aStep->GetTrack()->GetMaterial();
100  G4double birk1 = material->GetIonisation()->GetBirksConstant();
101  G4double destep = aStep->GetTotalEnergyDeposit();
102  G4double stepl = aStep->GetStepLength();
103  G4double charge = aStep->GetTrack()->GetDefinition()->GetPDGCharge();
104  //
105  G4double response = destep;
106  if (birk1*destep*stepl*charge != 0.)
107  {
108  response = destep/(1. + birk1*destep/stepl);
109  }
110  return response;
111 }
112 
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114