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25 //
26 /// \file eventgenerator/HepMC/MCTruth/src/DetectorConstruction.cc
27 /// \brief Implementation of the DetectorConstruction class
28 //
29 //
30 //
31 //
32 // --------------------------------------------------------------
33 // GEANT 4 - DetectorConstruction class
34 // --------------------------------------------------------------
35 //
36 // Author: Witold POKORSKI (Witold.Pokorski@cern.ch)
37 //
38 // --------------------------------------------------------------
39 //
40 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
41
42 #include "DetectorConstruction.hh"
43
44 #include "G4Box.hh"
45 #include "G4LogicalVolume.hh"
46 #include "G4Material.hh"
47 #include "G4NistManager.hh"
48 #include "G4PVPlacement.hh"
49 #include "G4PhysicalConstants.hh"
50 #include "G4SystemOfUnits.hh"
51 #include "G4ThreeVector.hh"
52 #include "globals.hh"
53
54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
55
56 DetectorConstruction::DetectorConstruction() : G4VUserDetectorConstruction(), fAbsorberMaterial(0)
57 {}
58
59 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
60
61 DetectorConstruction::~DetectorConstruction() {}
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64
65 G4VPhysicalVolume* DetectorConstruction::Construct()
66 {
67 //------------------- materials ------------------------
68
69 //--- simple materials
70
71 G4NistManager* nistManager = G4NistManager::Instance();
72
73 // Iron has a X0 = 1.7585 cm and lambda_I = 16.760 cm.
74 G4Material* iron = nistManager->FindOrBuildMaterial("G4_Fe");
75
76 // Copper has a X0 = 1.4353 cm and lambda_I = 15.056 cm.
77 G4Material* copper = nistManager->FindOrBuildMaterial("G4_Cu");
78
79 // Tungsten has a X0 = 0.35 cm and lambda_I = 9.5855 cm.
80 G4Material* tungsten = nistManager->FindOrBuildMaterial("G4_W");
81
82 // Lead has a X0 = 0.56120 cm and lambda_I = 17.092 cm.
83 G4Material* lead = nistManager->FindOrBuildMaterial("G4_Pb");
84
85 // Uranium has a X0 = 0.31662 cm and lambda_I = 10.501 cm.
86 G4Material* uranium = nistManager->FindOrBuildMaterial("G4_U");
87
88 // Liquid Argon has a X0 = 10.971 cm and lambda_I = 65.769 cm.
89 G4double a, z, density;
90 density = 1.4 * g / cm3;
91 a = 39.95 * g / mole;
92 G4Material* liquidArgon = new G4Material("LiquidArgon", z = 18., a, density);
93
94 //--- mixtures
95
96 G4Material* air = nistManager->FindOrBuildMaterial("G4_AIR");
97
98 // 4-May-2006 : We rename "Vacuum" as "G4vacuum" to avoid
99 // problems with Flugg.
100 G4double pressure, temperature, fractionMass;
101 G4int nel;
102 density = 1.e-5 * g / cm3;
103 pressure = 2.e-2 * bar;
104 temperature = STP_Temperature; // From PhysicalConstants.h .
105 G4Material* vacuum =
106 new G4Material("G4vacuum", density, nel = 1, kStateGas, temperature, pressure);
107 vacuum->AddMaterial(air, fractionMass = 1.);
108
109 // Plastic scintillator tiles (used both in CMS hadron calorimeter
110 // and ATLAS hadron barrel calorimeter):
111 // X0 = 42.4 cm and lambda_I = 79.360 cm.
112 G4int natoms;
113 G4Element* elH = nistManager->FindOrBuildElement("H");
114 G4Element* elC = nistManager->FindOrBuildElement("C");
115 density = 1.032 * g / cm3;
116 G4Material* polystyrene = new G4Material("Polystyrene", density, nel = 2);
117 polystyrene->AddElement(elC, natoms = 19);
118 polystyrene->AddElement(elH, natoms = 21);
119
120 // PbWO4 CMS crystals. It has a X0 = 0.89 cm and lambda_I = 22.4 cm.
121 G4Element* elPb = nistManager->FindOrBuildElement("Pb");
122 G4Element* elW = nistManager->FindOrBuildElement("W");
123 G4Element* elO = nistManager->FindOrBuildElement("O");
124 density = 8.28 * g / cm3;
125 G4Material* pbWO4 = new G4Material("PbWO4", density, nel = 3);
126 pbWO4->AddElement(elPb, natoms = 1);
127 pbWO4->AddElement(elW, natoms = 1);
128 pbWO4->AddElement(elO, natoms = 4);
129
130 //------------------- volumes --------------------------
131
132 // --- experimental hall (world volume)
133 // beam line along z axis
134
135 //***LOOKHERE***
136 const G4double sizeExpHall = 4.0 * m; // For normal calorimeter
137 // const G4double sizeExpHall = 10.0*m; // For Scintillator calorimeter
138
139 G4double expHall_x = sizeExpHall / 2.0; // half dimension along x
140 G4double expHall_y = sizeExpHall / 2.0; // half dimension along y
141 G4double expHall_z = sizeExpHall / 2.0; // half dimension along z
142
143 G4Box* experimentalHall_box = new G4Box("expHall_box", expHall_x, expHall_y, expHall_z);
144
145 G4LogicalVolume* experimentalHallLog = new G4LogicalVolume(experimentalHall_box, // solid
146 vacuum, // material
147 "expHall_log", // name
148 0, // field manager
149 0, // sensitive detector
150 0); // user limits
151
152 G4VPhysicalVolume* experimentalHallPhys =
153 new G4PVPlacement(0, // rotation
154 G4ThreeVector(), // translation
155 "expHall", // name
156 experimentalHallLog, // logical volume
157 0, // mother physical volume
158 false, // boolean operation
159 0); // copy number
160
161 // --- Detector
162
163 //***LOOKHERE***
164 const G4double sizeCalo = 2.0 * m; // For normal calorimeter
165 // const G4double sizeCalo = 8.0*m; // For Scintillator calorimeter
166
167 G4double xAbsorber = sizeCalo / 2.0; // half dimension along x
168 G4double yAbsorber = sizeCalo / 2.0; // half dimension along y
169 G4double zAbsorber = sizeCalo / 2.0; // half dimension along z
170
171 G4Box* solidAbsorber = new G4Box("solidAbsorber", xAbsorber, yAbsorber, zAbsorber);
172
173 G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, // solid
174 fAbsorberMaterial, // material
175 "logicAbsorber", // name
176 0, // field manager
177 0, // sensitive detector
178 0); // user limits
179
180 new G4PVPlacement(0, // rotation
181 G4ThreeVector(), // translation
182 "physiAbsorber", // its name
183 logicAbsorber, // logical volume
184 experimentalHallPhys, // mother physical volume
185 false, // boolean operation
186 100); // copy number
187
188 // --- Check if all materials were built
189 if ((!iron) || (!copper) || (!tungsten) || (!lead) || (!uranium) || (!pbWO4) || (!polystyrene)
190 || (!liquidArgon))
191 {
192 G4cerr << "Failure in building materials." << G4endl;
193 }
194
195 // --- Set default values ***LOOKHERE***
196 fAbsorberMaterial = iron;
197 // fAbsorberMaterial = copper;
198 // fAbsorberMaterial = tungsten;
199 // fAbsorberMaterial = lead;
200 // fAbsorberMaterial = uranium;
201 // fAbsorberMaterial = pbWO4;
202 // fAbsorberMaterial = polystyrene;
203 // fAbsorberMaterial = liquidArgon;
204
205 logicAbsorber->SetMaterial(fAbsorberMaterial);
206
207 PrintParameters();
208
209 return experimentalHallPhys;
210 }
211
212 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
213
214 void DetectorConstruction::PrintParameters()
215 {
216 G4cout << G4endl << G4endl << " ------ DetectorConstruction::PrintParameters() ------ " << G4endl
217 << " Absorber Material = ";
218 if (fAbsorberMaterial) {
219 G4cout << fAbsorberMaterial->GetName();
220 }
221 else {
222 G4cout << " UNDEFINED ";
223 }
224 G4cout << G4endl << " -------------------------------------------------------- " << G4endl
225 << G4endl;
226 }
227
228 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
229