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26 //
27 /// \file B4/B4a/src/DetectorConstruction.cc
28 /// \brief Implementation of the B4::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 "G4NistManager.hh"
39 #include "G4PVPlacement.hh"
40 #include "G4PVReplica.hh"
41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh"
43 #include "G4VisAttributes.hh"
44
45 namespace B4
46 {
47
48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
49
50 G4ThreadLocal G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;
51
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53
54 G4VPhysicalVolume* DetectorConstruction::Construct()
55 {
56 // Define materials
57 DefineMaterials();
58
59 // Define volumes
60 return DefineVolumes();
61 }
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65 void DetectorConstruction::DefineMaterials()
66 {
67 // Lead material defined using NIST Manager
68 auto nistManager = G4NistManager::Instance();
69 nistManager->FindOrBuildMaterial("G4_Pb");
70
71 // Liquid argon material
72 G4double a; // mass of a mole;
73 G4double z; // z=mean number of protons;
74 G4double density;
75 new G4Material("liquidArgon", z = 18., a = 39.95 * g / mole, density = 1.390 * g / cm3);
76 // The argon by NIST Manager is a gas with a different density
77
78 // Vacuum
79 new G4Material("Galactic", z = 1., a = 1.01 * g / mole, density = universe_mean_density,
80 kStateGas, 2.73 * kelvin, 3.e-18 * pascal);
81
82 // Print materials
83 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
84 }
85
86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
87
88 G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
89 {
90 // Geometry parameters
91 G4int nofLayers = 10;
92 G4double absoThickness = 10. * mm;
93 G4double gapThickness = 5. * mm;
94 G4double calorSizeXY = 10. * cm;
95
96 auto layerThickness = absoThickness + gapThickness;
97 auto calorThickness = nofLayers * layerThickness;
98 auto worldSizeXY = 1.2 * calorSizeXY;
99 auto worldSizeZ = 1.2 * calorThickness;
100
101 // Get materials
102 auto defaultMaterial = G4Material::GetMaterial("Galactic");
103 auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
104 auto gapMaterial = G4Material::GetMaterial("liquidArgon");
105
106 if (!defaultMaterial || !absorberMaterial || !gapMaterial) {
107 G4ExceptionDescription msg;
108 msg << "Cannot retrieve materials already defined.";
109 G4Exception("DetectorConstruction::DefineVolumes()", "MyCode0001", FatalException, msg);
110 }
111
112 //
113 // World
114 //
115 auto worldS = new G4Box("World", // its name
116 worldSizeXY / 2, worldSizeXY / 2, worldSizeZ / 2); // its size
117
118 auto worldLV = new G4LogicalVolume(worldS, // its solid
119 defaultMaterial, // its material
120 "World"); // its name
121
122 auto worldPV = new G4PVPlacement(nullptr, // no rotation
123 G4ThreeVector(), // at (0,0,0)
124 worldLV, // its logical volume
125 "World", // its name
126 nullptr, // its mother volume
127 false, // no boolean operation
128 0, // copy number
129 fCheckOverlaps); // checking overlaps
130
131 //
132 // Calorimeter
133 //
134 auto calorimeterS = new G4Box("Calorimeter", // its name
135 calorSizeXY / 2, calorSizeXY / 2, calorThickness / 2); // its size
136
137 auto calorLV = new G4LogicalVolume(calorimeterS, // its solid
138 defaultMaterial, // its material
139 "Calorimeter"); // its name
140
141 new G4PVPlacement(nullptr, // no rotation
142 G4ThreeVector(), // at (0,0,0)
143 calorLV, // its logical volume
144 "Calorimeter", // its name
145 worldLV, // its mother volume
146 false, // no boolean operation
147 0, // copy number
148 fCheckOverlaps); // checking overlaps
149
150 //
151 // Layer
152 //
153 auto layerS = new G4Box("Layer", // its name
154 calorSizeXY / 2, calorSizeXY / 2, layerThickness / 2); // its size
155
156 auto layerLV = new G4LogicalVolume(layerS, // its solid
157 defaultMaterial, // its material
158 "Layer"); // its name
159
160 new G4PVReplica("Layer", // its name
161 layerLV, // its logical volume
162 calorLV, // its mother
163 kZAxis, // axis of replication
164 nofLayers, // number of replica
165 layerThickness); // witdth of replica
166
167 //
168 // Absorber
169 //
170 auto absorberS = new G4Box("Abso", // its name
171 calorSizeXY / 2, calorSizeXY / 2, absoThickness / 2); // its size
172
173 auto absorberLV = new G4LogicalVolume(absorberS, // its solid
174 absorberMaterial, // its material
175 "Abso"); // its name
176
177 fAbsorberPV = new G4PVPlacement(nullptr, // no rotation
178 G4ThreeVector(0., 0., -gapThickness / 2), // its position
179 absorberLV, // its logical volume
180 "Abso", // its name
181 layerLV, // its mother volume
182 false, // no boolean operation
183 0, // copy number
184 fCheckOverlaps); // checking overlaps
185
186 //
187 // Gap
188 //
189 auto gapS = new G4Box("Gap", // its name
190 calorSizeXY / 2, calorSizeXY / 2, gapThickness / 2); // its size
191
192 auto gapLV = new G4LogicalVolume(gapS, // its solid
193 gapMaterial, // its material
194 "Gap"); // its name
195
196 fGapPV = new G4PVPlacement(nullptr, // no rotation
197 G4ThreeVector(0., 0., absoThickness / 2), // its position
198 gapLV, // its logical volume
199 "Gap", // its name
200 layerLV, // its mother volume
201 false, // no boolean operation
202 0, // copy number
203 fCheckOverlaps); // checking overlaps
204
205 //
206 // print parameters
207 //
208 G4cout << G4endl << "------------------------------------------------------------" << G4endl
209 << "---> The calorimeter is " << nofLayers << " layers of: [ " << absoThickness / mm
210 << "mm of " << absorberMaterial->GetName() << " + " << gapThickness / mm << "mm of "
211 << gapMaterial->GetName() << " ] " << G4endl
212 << "------------------------------------------------------------" << G4endl;
213
214 //
215 // Visualization attributes
216 //
217 worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());
218 calorLV->SetVisAttributes(G4VisAttributes(G4Colour::White()));
219
220 //
221 // Always return the physical World
222 //
223 return worldPV;
224 }
225
226 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
227
228 void DetectorConstruction::ConstructSDandField()
229 {
230 // Create global magnetic field messenger.
231 // Uniform magnetic field is then created automatically if
232 // the field value is not zero.
233 G4ThreeVector fieldValue;
234 fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
235 fMagFieldMessenger->SetVerboseLevel(1);
236
237 // Register the field messenger for deleting
238 G4AutoDelete::Register(fMagFieldMessenger);
239 }
240
241 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
242
243 } // namespace B4
244