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25 //
26 /// \file electromagnetic/TestEm15/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 "HistoManager.hh"
37 #include "RunAction.hh"
38
39 #include "G4ParticleTypes.hh"
40 #include "G4RunManager.hh"
41
42 #include <G4RotationMatrix.hh>
43 #include <G4ThreeVector.hh>
44
45 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
46
47 SteppingAction::SteppingAction(DetectorConstruction* det, RunAction* RuAct)
48 : G4UserSteppingAction(), fDetector(det), fRunAction(RuAct)
49 {}
50
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52
53 SteppingAction::~SteppingAction() {}
54
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56
57 void SteppingAction::UserSteppingAction(const G4Step* aStep)
58 {
59 G4StepPoint* prePoint = aStep->GetPreStepPoint();
60
61 // if World --> return
62 if (prePoint->GetTouchableHandle()->GetVolume() == fDetector->GetWorld()) return;
63
64 // here we enter in the absorber Box
65 // tag the event to be killed anyway after this step
66 //
67 G4RunManager::GetRunManager()->AbortEvent();
68
69 // count processes and keep only Multiple Scattering or gamma converion
70 //
71 G4StepPoint* endPoint = aStep->GetPostStepPoint();
72 G4String procName = endPoint->GetProcessDefinedStep()->GetProcessName();
73 fRunAction->CountProcesses(procName);
74
75 if (procName == "msc" || procName == "muMsc" || procName == "stepMax") {
76 // below, only multiple Scattering happens
77 //
78 G4ThreeVector position = endPoint->GetPosition();
79 G4ThreeVector direction = endPoint->GetMomentumDirection();
80
81 G4double truePathLength = aStep->GetStepLength();
82 G4double geomPathLength = position.x() + 0.5 * fDetector->GetBoxSize();
83 G4double ratio = geomPathLength / truePathLength;
84 fRunAction->SumPathLength(truePathLength, geomPathLength);
85 G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
86 analysisManager->FillH1(1, truePathLength);
87 analysisManager->FillH1(2, geomPathLength);
88 analysisManager->FillH1(3, ratio);
89
90 G4double yend = position.y(), zend = position.z();
91 G4double lateralDisplacement = std::sqrt(yend * yend + zend * zend);
92 fRunAction->SumLateralDisplacement(lateralDisplacement);
93 analysisManager->FillH1(4, lateralDisplacement);
94
95 G4double psi = std::atan(lateralDisplacement / geomPathLength);
96 fRunAction->SumPsi(psi);
97 analysisManager->FillH1(5, psi);
98
99 G4double xdir = direction.x(), ydir = direction.y(), zdir = direction.z();
100 G4double tetaPlane = std::atan2(ydir, xdir);
101 fRunAction->SumTetaPlane(tetaPlane);
102 analysisManager->FillH1(6, tetaPlane);
103 tetaPlane = std::atan2(zdir, xdir);
104 fRunAction->SumTetaPlane(tetaPlane);
105 analysisManager->FillH1(6, tetaPlane);
106
107 G4double phiPos = std::atan2(zend, yend);
108 analysisManager->FillH1(7, phiPos);
109 G4double phiDir = std::atan2(zdir, ydir);
110 analysisManager->FillH1(8, phiDir);
111
112 G4double phiCorrel = 0.;
113 if (lateralDisplacement > 0.) phiCorrel = (yend * ydir + zend * zdir) / lateralDisplacement;
114 fRunAction->SumPhiCorrel(phiCorrel);
115 analysisManager->FillH1(9, phiCorrel);
116 }
117 else if (procName == "conv" || procName == "GammaToMuPair") {
118 // gamma conversion
119
120 G4StepPoint* PrePoint = aStep->GetPreStepPoint();
121 G4double EGamma = PrePoint->GetTotalEnergy();
122 G4ThreeVector PGamma = PrePoint->GetMomentum();
123 G4ThreeVector PolaGamma = PrePoint->GetPolarization();
124
125 G4double Eplus = -1;
126 G4ThreeVector Pplus, Pminus, Precoil;
127
128 const G4TrackVector* secondary = fpSteppingManager->GetSecondary();
129
130 const size_t Nsecondaries = (*secondary).size();
131
132 // No conversion , E < threshold
133 if (Nsecondaries == 0) return;
134
135 for (size_t lp = 0; lp < std::min(Nsecondaries, size_t(2)); lp++) {
136 if (((*secondary)[lp]->GetDefinition() == G4Electron::Definition())
137 || ((*secondary)[lp]->GetDefinition() == G4MuonMinus::Definition()))
138 {
139 Pminus = (*secondary)[lp]->GetMomentum();
140 }
141 if (((*secondary)[lp]->GetDefinition() == G4Positron::Definition())
142 || ((*secondary)[lp]->GetDefinition() == G4MuonPlus::Definition()))
143 {
144 Eplus = (*secondary)[lp]->GetTotalEnergy();
145 Pplus = (*secondary)[lp]->GetMomentum();
146 }
147 }
148
149 if (Nsecondaries >= 3) {
150 Precoil = (*secondary)[2]->GetMomentum();
151 }
152
153 G4AnalysisManager* analysisManager = G4AnalysisManager::Instance();
154
155 // Fill Histograms
156
157 G4ThreeVector z = PGamma.unit(); // gamma direction
158 G4ThreeVector x(1., 0., 0.);
159
160 // pola perpendicular to direction
161
162 if (PolaGamma.mag() != 0.0) {
163 x = PolaGamma.unit();
164 }
165 else { // Pola = 0 case
166 x = z.orthogonal().unit();
167 }
168
169 G4ThreeVector y = z;
170 y = y.cross(x);
171
172 G4RotationMatrix GtoW(x, y, z); // from gamma ref. sys. to World
173 G4RotationMatrix WtoG = inverseOf(GtoW); // from World to gamma ref. sys.
174
175 G4double angleE = Pplus.angle(Pminus) * EGamma;
176 analysisManager->FillH1(10, angleE);
177
178 if (Nsecondaries >= 3) {
179 // recoil returned
180 analysisManager->FillH1(11, std::log10(Precoil.mag()));
181 analysisManager->FillH1(12, Precoil.transform(WtoG).phi());
182 }
183 G4double phiPlus = Pplus.transform(WtoG).phi();
184 G4double phiMinus = Pminus.transform(WtoG).phi();
185 analysisManager->FillH1(13, phiPlus);
186 analysisManager->FillH1(14, std::cos(phiPlus + phiMinus) * -2.0);
187 analysisManager->FillH1(15, Eplus / EGamma);
188
189 G4double phiPola = PolaGamma.transform(WtoG).phi();
190 analysisManager->FillH1(16, phiPola);
191 }
192 }
193
194 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
195