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26 //
27 /// \file B4/B4d/src/DetectorConstruction.cc
28 /// \brief Implementation of the B4d::DetectorConstruction class
29
30 #include "DetectorConstruction.hh"
31
32 #include "G4AutoDelete.hh"
33 #include "G4Box.hh"
34 #include "G4Colour.hh"
35 #include "G4GlobalMagFieldMessenger.hh"
36 #include "G4LogicalVolume.hh"
37 #include "G4Material.hh"
38 #include "G4MultiFunctionalDetector.hh"
39 #include "G4NistManager.hh"
40 #include "G4PSEnergyDeposit.hh"
41 #include "G4PSTrackLength.hh"
42 #include "G4PVPlacement.hh"
43 #include "G4PVReplica.hh"
44 #include "G4PhysicalConstants.hh"
45 #include "G4SDChargedFilter.hh"
46 #include "G4SDManager.hh"
47 #include "G4SystemOfUnits.hh"
48 #include "G4VPrimitiveScorer.hh"
49 #include "G4VisAttributes.hh"
50
51 namespace B4d
52 {
53
54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
55
56 G4ThreadLocal G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;
57
58 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
59
60 G4VPhysicalVolume* DetectorConstruction::Construct()
61 {
62 // Define materials
63 DefineMaterials();
64
65 // Define volumes
66 return DefineVolumes();
67 }
68
69 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
70
71 void DetectorConstruction::DefineMaterials()
72 {
73 // Lead material defined using NIST Manager
74 auto nistManager = G4NistManager::Instance();
75 nistManager->FindOrBuildMaterial("G4_Pb");
76
77 // Liquid argon material
78 G4double a; // mass of a mole;
79 G4double z; // z=mean number of protons;
80 G4double density;
81 new G4Material("liquidArgon", z = 18., a = 39.95 * g / mole, density = 1.390 * g / cm3);
82 // The argon by NIST Manager is a gas with a different density
83
84 // Vacuum
85 new G4Material("Galactic", z = 1., a = 1.01 * g / mole, density = universe_mean_density,
86 kStateGas, 2.73 * kelvin, 3.e-18 * pascal);
87
88 // Print materials
89 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
90 }
91
92 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
93
94 G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
95 {
96 // Geometry parameters
97 G4int nofLayers = 10;
98 G4double absoThickness = 10. * mm;
99 G4double gapThickness = 5. * mm;
100 G4double calorSizeXY = 10. * cm;
101
102 auto layerThickness = absoThickness + gapThickness;
103 auto calorThickness = nofLayers * layerThickness;
104 auto worldSizeXY = 1.2 * calorSizeXY;
105 auto worldSizeZ = 1.2 * calorThickness;
106
107 // Get materials
108 auto defaultMaterial = G4Material::GetMaterial("Galactic");
109 auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
110 auto gapMaterial = G4Material::GetMaterial("liquidArgon");
111
112 if (!defaultMaterial || !absorberMaterial || !gapMaterial) {
113 G4ExceptionDescription msg;
114 msg << "Cannot retrieve materials already defined.";
115 G4Exception("DetectorConstruction::DefineVolumes()", "MyCode0001", FatalException, msg);
116 }
117
118 //
119 // World
120 //
121 auto worldS = new G4Box("World", // its name
122 worldSizeXY / 2, worldSizeXY / 2, worldSizeZ / 2); // its size
123
124 auto worldLV = new G4LogicalVolume(worldS, // its solid
125 defaultMaterial, // its material
126 "World"); // its name
127
128 auto worldPV = new G4PVPlacement(nullptr, // no rotation
129 G4ThreeVector(), // at (0,0,0)
130 worldLV, // its logical volume
131 "World", // its name
132 nullptr, // its mother volume
133 false, // no boolean operation
134 0, // copy number
135 fCheckOverlaps); // checking overlaps
136
137 //
138 // Calorimeter
139 //
140 auto calorimeterS = new G4Box("Calorimeter", // its name
141 calorSizeXY / 2, calorSizeXY / 2, calorThickness / 2); // its size
142
143 auto calorLV = new G4LogicalVolume(calorimeterS, // its solid
144 defaultMaterial, // its material
145 "Calorimeter"); // its name
146
147 new G4PVPlacement(nullptr, // no rotation
148 G4ThreeVector(), // at (0,0,0)
149 calorLV, // its logical volume
150 "Calorimeter", // its name
151 worldLV, // its mother volume
152 false, // no boolean operation
153 0, // copy number
154 fCheckOverlaps); // checking overlaps
155
156 //
157 // Layer
158 //
159 auto layerS = new G4Box("Layer", // its name
160 calorSizeXY / 2, calorSizeXY / 2, layerThickness / 2); // its size
161
162 auto layerLV = new G4LogicalVolume(layerS, // its solid
163 defaultMaterial, // its material
164 "Layer"); // its name
165
166 new G4PVReplica("Layer", // its name
167 layerLV, // its logical volume
168 calorLV, // its mother
169 kZAxis, // axis of replication
170 nofLayers, // number of replica
171 layerThickness); // witdth of replica
172
173 //
174 // Absorber
175 //
176 auto absorberS = new G4Box("Abso", // its name
177 calorSizeXY / 2, calorSizeXY / 2, absoThickness / 2); // its size
178
179 auto absorberLV = new G4LogicalVolume(absorberS, // its solid
180 absorberMaterial, // its material
181 "AbsoLV"); // its name
182
183 new G4PVPlacement(nullptr, // no rotation
184 G4ThreeVector(0., 0., -gapThickness / 2), // its position
185 absorberLV, // its logical volume
186 "Abso", // its name
187 layerLV, // its mother volume
188 false, // no boolean operation
189 0, // copy number
190 fCheckOverlaps); // checking overlaps
191
192 //
193 // Gap
194 //
195 auto gapS = new G4Box("Gap", // its name
196 calorSizeXY / 2, calorSizeXY / 2, gapThickness / 2); // its size
197
198 auto gapLV = new G4LogicalVolume(gapS, // its solid
199 gapMaterial, // its material
200 "GapLV"); // its name
201
202 new G4PVPlacement(nullptr, // no rotation
203 G4ThreeVector(0., 0., absoThickness / 2), // its position
204 gapLV, // its logical volume
205 "Gap", // its name
206 layerLV, // its mother volume
207 false, // no boolean operation
208 0, // copy number
209 fCheckOverlaps); // checking overlaps
210
211 //
212 // print parameters
213 //
214 G4cout << G4endl << "------------------------------------------------------------" << G4endl
215 << "---> The calorimeter is " << nofLayers << " layers of: [ " << absoThickness / mm
216 << "mm of " << absorberMaterial->GetName() << " + " << gapThickness / mm << "mm of "
217 << gapMaterial->GetName() << " ] " << G4endl
218 << "------------------------------------------------------------" << G4endl;
219
220 //
221 // Visualization attributes
222 //
223 worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());
224 calorLV->SetVisAttributes(G4VisAttributes(G4Colour::White()));
225
226 //
227 // Always return the physical World
228 //
229 return worldPV;
230 }
231
232 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
233
234 void DetectorConstruction::ConstructSDandField()
235 {
236 G4SDManager::GetSDMpointer()->SetVerboseLevel(1);
237 //
238 // Scorers
239 //
240
241 // declare Absorber as a MultiFunctionalDetector scorer
242 //
243 auto absDetector = new G4MultiFunctionalDetector("Absorber");
244 G4SDManager::GetSDMpointer()->AddNewDetector(absDetector);
245
246 G4VPrimitiveScorer* primitive;
247 primitive = new G4PSEnergyDeposit("Edep");
248 absDetector->RegisterPrimitive(primitive);
249
250 primitive = new G4PSTrackLength("TrackLength");
251 auto charged = new G4SDChargedFilter("chargedFilter");
252 primitive->SetFilter(charged);
253 absDetector->RegisterPrimitive(primitive);
254
255 SetSensitiveDetector("AbsoLV", absDetector);
256
257 // declare Gap as a MultiFunctionalDetector scorer
258 //
259 auto gapDetector = new G4MultiFunctionalDetector("Gap");
260 G4SDManager::GetSDMpointer()->AddNewDetector(gapDetector);
261
262 primitive = new G4PSEnergyDeposit("Edep");
263 gapDetector->RegisterPrimitive(primitive);
264
265 primitive = new G4PSTrackLength("TrackLength");
266 primitive->SetFilter(charged);
267 gapDetector->RegisterPrimitive(primitive);
268
269 SetSensitiveDetector("GapLV", gapDetector);
270
271 //
272 // Magnetic field
273 //
274 // Create global magnetic field messenger.
275 // Uniform magnetic field is then created automatically if
276 // the field value is not zero.
277 G4ThreeVector fieldValue;
278 fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
279 fMagFieldMessenger->SetVerboseLevel(1);
280
281 // Register the field messenger for deleting
282 G4AutoDelete::Register(fMagFieldMessenger);
283 }
284
285 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
286
287 } // namespace B4d
288