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25 //
26 /// \file Par01/src/Par01EMShowerModel.cc
27 /// \brief Implementation of the Par01EMShower
28 //
29 //
30 //
31 #include "Par01EMShowerModel.hh"
32
33 #include "Par01EnergySpot.hh"
34
35 #include "G4Electron.hh"
36 #include "G4Gamma.hh"
37 #include "G4NistManager.hh"
38 #include "G4PhysicalConstants.hh"
39 #include "G4Positron.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4TouchableHandle.hh"
42 #include "G4TransportationManager.hh"
43 #include "G4VSensitiveDetector.hh"
44 #include "Randomize.hh"
45
46 //....oooOO0OOooo........oooOO0OOooo........oo
47
48 Par01EMShowerModel::Par01EMShowerModel(G4Strin
49 : G4VFastSimulationModel(modelName, envelope
50 {
51 fFakeStep = new G4Step();
52 fFakePreStepPoint = fFakeStep->GetPreStepPoi
53 fFakePostStepPoint = fFakeStep->GetPostStepP
54 fTouchableHandle = new G4TouchableHistory();
55 fpNavigator = new G4Navigator();
56 fNaviSetup = false;
57 fCsI = nullptr;
58 }
59
60 //....oooOO0OOooo........oooOO0OOooo........oo
61
62 Par01EMShowerModel::Par01EMShowerModel(G4Strin
63 {
64 fFakeStep = new G4Step();
65 fFakePreStepPoint = fFakeStep->GetPreStepPoi
66 fFakePostStepPoint = fFakeStep->GetPostStepP
67 fTouchableHandle = new G4TouchableHistory();
68 fpNavigator = new G4Navigator();
69 fNaviSetup = false;
70 fCsI = nullptr;
71 }
72
73 //....oooOO0OOooo........oooOO0OOooo........oo
74
75 Par01EMShowerModel::~Par01EMShowerModel()
76 {
77 delete fFakeStep;
78 delete fpNavigator;
79 }
80
81 //....oooOO0OOooo........oooOO0OOooo........oo
82
83 G4bool Par01EMShowerModel::IsApplicable(const
84 {
85 return &particleType == G4Electron::Electron
86 || &particleType == G4Positron::Posit
87 || &particleType == G4Gamma::GammaDef
88 }
89
90 //....oooOO0OOooo........oooOO0OOooo........oo
91
92 G4bool Par01EMShowerModel::ModelTrigger(const
93 {
94 // Applies the parameterisation above 100 Me
95 return fastTrack.GetPrimaryTrack()->GetKinet
96 }
97
98 //....oooOO0OOooo........oooOO0OOooo........oo
99
100 void Par01EMShowerModel::DoIt(const G4FastTrac
101 {
102 // Kill the parameterised particle:
103 fastStep.KillPrimaryTrack();
104 fastStep.ProposePrimaryTrackPathLength(0.0);
105 fastStep.ProposeTotalEnergyDeposited(fastTra
106
107 // split into "energy spots" energy accordin
108 Explode(fastTrack);
109
110 // and put those energy spots into the cryst
111 BuildDetectorResponse();
112 }
113
114 //....oooOO0OOooo........oooOO0OOooo........oo
115
116 void Par01EMShowerModel::Explode(const G4FastT
117 {
118 //------------------------------------------
119 //
120 //------------------------------------------
121
122 // Reduced quantities:
123 // -- critical energy in CsI:
124 G4double Ec = 800 * MeV / (54. + 1.2); // 5
125 G4double Energy = fastTrack.GetPrimaryTrack(
126 G4double y = Energy / Ec;
127
128 // compute value of parameter "a" of longitu
129 G4double a, tmax, b(0.5), C;
130 if (fastTrack.GetPrimaryTrack()->GetDefiniti
131 C = 0.5;
132 else
133 C = -0.5;
134 tmax = 1.0 * (std::log(y) + C);
135 a = 1.0 + b * tmax;
136
137 // t : reduced quantity = z/X0:
138 G4double t, bt;
139 if (fCsI == nullptr) fCsI = G4NistManager::I
140 G4double X0 = fCsI->GetRadlen();
141 // Moliere radius:
142 G4double Es = 21 * MeV;
143 G4double Rm = X0 * Es / Ec;
144
145 // axis of the shower, in global reference f
146 G4ThreeVector xShower, yShower, zShower;
147 zShower = fastTrack.GetPrimaryTrack()->GetMo
148 xShower = zShower.orthogonal();
149 yShower = zShower.cross(xShower);
150 // starting point of the shower:
151 G4ThreeVector sShower = fastTrack.GetPrimary
152
153 // We shoot 100 spots of energy:
154 G4int nSpots = 100;
155 G4double deposit = Energy / double(nSpots);
156 Par01EnergySpot eSpot;
157 eSpot.SetEnergy(deposit);
158 G4ThreeVector ePoint;
159 G4double z, r, phi;
160
161 feSpotList.clear();
162 for (int i = 0; i < nSpots; i++) {
163 // Longitudinal profile:
164 // -- shoot z according to Gamma distribut
165 bt = G4RandGamma::shoot(a, 1.0);
166 t = bt / b;
167 z = t * X0;
168
169 // transverse profile:
170 // we set 90% of energy in one Rm,
171 // the rest between 1 and 3.5 Rm:
172 G4double xr = G4UniformRand();
173 if (xr < 0.9)
174 r = xr / 0.9 * Rm;
175 else
176 r = ((xr - 0.9) / 0.1 * 2.5 + 1.0) * Rm;
177 phi = G4UniformRand() * twopi;
178
179 // build the position:
180 ePoint = sShower + z * zShower + r * std::
181
182 // and the energy spot:
183 eSpot.SetPosition(ePoint);
184
185 // Records the eSpot:
186 feSpotList.push_back(eSpot);
187 }
188 }
189
190 //....oooOO0OOooo........oooOO0OOooo........oo
191
192 void Par01EMShowerModel::BuildDetectorResponse
193 {
194 // Does the assignation of the energy spots
195 for (size_t i = 0; i < feSpotList.size(); i+
196 // Draw the energy spot:
197 // feSpotList[i].Draw();
198 // feSpotList[i].Print();
199
200 // "converts" the energy spot into the fak
201 // G4Step to pass to sensitive detector:
202 AssignSpotAndCallHit(feSpotList[i]);
203 }
204 }
205
206 //....oooOO0OOooo........oooOO0OOooo........oo
207
208 void Par01EMShowerModel::AssignSpotAndCallHit(
209 {
210 //
211 // "converts" the energy spot into the fake
212 // G4Step to pass to sensitive detector:
213 //
214 FillFakeStep(eSpot);
215
216 //
217 // call sensitive part: taken/adapted from t
218 // Send G4Step information to Hit/Dig if the
219 //
220 G4VPhysicalVolume* pCurrentVolume = fFakeSte
221 G4VSensitiveDetector* pSensitive;
222
223 if (pCurrentVolume != nullptr) {
224 pSensitive = pCurrentVolume->GetLogicalVol
225 if (pSensitive != nullptr) {
226 pSensitive->Hit(fFakeStep);
227 }
228 }
229 }
230
231 //....oooOO0OOooo........oooOO0OOooo........oo
232
233 void Par01EMShowerModel::FillFakeStep(const Pa
234 {
235 //------------------------------------------
236 // find in which volume the spot is.
237 //------------------------------------------
238 if (!fNaviSetup) {
239 fpNavigator->SetWorldVolume(G4Transportati
240 ->GetNavigat
241 ->GetWorldVo
242 fpNavigator->LocateGlobalPointAndUpdateTou
243 eSpot.GetPosition(), G4ThreeVector(0., 0
244 fNaviSetup = true;
245 }
246 else {
247 fpNavigator->LocateGlobalPointAndUpdateTou
248 eSpot.GetPosition(), G4ThreeVector(0., 0
249 }
250 //--------------------------------------
251 // Fills attribute of the G4Step needed
252 // by our sensitive detector:
253 //-------------------------------------
254 // set touchable volume at PreStepPoint:
255 fFakePreStepPoint->SetTouchableHandle(fTouch
256 // set total energy deposit:
257 fFakeStep->SetTotalEnergyDeposit(eSpot.GetEn
258 }
259