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25 //
26 /// \file electromagnetic/TestEm10/src/DetectorALICE06.cc
27 /// \brief Implementation of the DetectorALICE06 class
28 //
29 //
30 //
31 //
32
33 #include "DetectorALICE06.hh"
34
35 #include "Materials.hh"
36 #include "SensitiveDetector.hh"
37
38 #include "G4Box.hh"
39 #include "G4FieldManager.hh"
40 #include "G4LogicalVolume.hh"
41 #include "G4Material.hh"
42 #include "G4PVPlacement.hh"
43 #include "G4Region.hh"
44 #include "G4SDManager.hh"
45 #include "G4SystemOfUnits.hh"
46 #include "G4TransportationManager.hh"
47 #include "G4UniformMagField.hh"
48 #include "G4UnitsTable.hh"
49 #include "G4ios.hh"
50
51 #include <cmath>
52
53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
54
55 DetectorALICE06::DetectorALICE06() : fRadiatorDescription(0) {}
56
57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
58
59 DetectorALICE06::~DetectorALICE06()
60 {
61 // delete fRadiatorDescription;
62 // the description is deleted in detector construction
63 }
64
65 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
66
67 G4VPhysicalVolume* DetectorALICE06::Construct()
68 {
69 // Geometry parameters
70 //
71
72 G4cout << "DetectorALICE06 setup" << G4endl;
73
74 G4double worldSizeZ = 600. * cm;
75 G4double worldSizeR = 22. * cm;
76
77 // Radiator and detector parameters
78
79 G4double radThickness = 0.020 * mm;
80 G4double gasGap = 0.500 * mm;
81 G4double foilGasRatio = radThickness / (radThickness + gasGap);
82 G4int foilNumber = 120;
83
84 G4double absorberThickness = 37 * mm;
85 G4double absorberRadius = 100. * mm;
86
87 G4double electrodeThick = 100.0 * micrometer;
88 G4double pipeLength = 160.0 * cm;
89 G4double mylarThick = 20.0 * micrometer;
90 G4double detGap = 0.01 * mm;
91
92 G4double startZ = 100.0 * mm;
93
94 // Materials
95 //
96
97 // Change to create materials using NIST
98 G4Material* air = Materials::GetInstance()->GetMaterial("Air");
99 G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
100 G4Material* xe15CO2 = Materials::GetInstance()->GetMaterial("Xe15CO2");
101
102 G4double foilDensity = ch2->GetDensity();
103 G4double gasDensity = air->GetDensity();
104 G4double totDensity = foilDensity * foilGasRatio + gasDensity * (1.0 - foilGasRatio);
105
106 G4double fractionFoil = foilDensity * foilGasRatio / totDensity;
107 G4double fractionGas = 1.0 - fractionFoil;
108 G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
109 radiatorMat->AddMaterial(ch2, fractionFoil);
110 radiatorMat->AddMaterial(air, fractionGas);
111
112 // Radiator description
113 fRadiatorDescription = new RadiatorDescription;
114 fRadiatorDescription->fFoilMaterial = ch2; // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
115 fRadiatorDescription->fGasMaterial = air; // CO2; // He; //
116 fRadiatorDescription->fFoilThickness = radThickness;
117 fRadiatorDescription->fGasThickness = gasGap;
118 fRadiatorDescription->fFoilNumber = foilNumber;
119
120 G4Material* worldMaterial = air; // CO2;
121 G4Material* absorberMaterial = xe15CO2;
122
123 // Volumes
124 //
125
126 G4VSolid* solidWorld = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ / 2.);
127
128 G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, worldMaterial, "World");
129
130 G4VPhysicalVolume* physicsWorld =
131 new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
132
133 // TR radiator envelope
134
135 G4double radThick = foilNumber * (radThickness + gasGap) - gasGap + detGap;
136 G4double radZ = startZ + 0.5 * radThick;
137
138 G4VSolid* solidRadiator =
139 new G4Box("Radiator", 1.1 * absorberRadius, 1.1 * absorberRadius, 0.5 * radThick);
140
141 G4LogicalVolume* logicRadiator = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
142
143 new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
144 0);
145
146 fRadiatorDescription->fLogicalVolume = logicRadiator;
147
148 // Create region for radiator
149
150 G4Region* radRegion = new G4Region("XTRradiator");
151 radRegion->AddRootLogicalVolume(logicRadiator);
152
153 // Drift Electrode on both sides of Radiator
154 // (not placed)
155
156 G4double zElectrode1 = radZ - radThick / 2. - electrodeThick / 2.;
157 G4double zElectrode2 = radZ + radThick / 2. + electrodeThick / 2.;
158
159 G4cout << "zElectrode1 = " << zElectrode1 / mm << " mm" << G4endl;
160 G4cout << "zElectrode2 = " << zElectrode2 / mm << " mm" << G4endl;
161 G4cout << "fElectrodeThick = " << electrodeThick / mm << " mm" << G4endl << G4endl;
162
163 // Helium Pipe
164 // (not placed)
165
166 // Distance between pipe and radiator / absorber
167 G4double pipeDist = 1. * cm;
168 G4double zPipe = zElectrode2 + electrodeThick / 2. + pipeDist / 2. + pipeLength / 2.;
169
170 G4cout << "zPipe = " << zPipe / mm << " mm" << G4endl;
171 G4cout << "pipeLength = " << pipeLength / mm << " mm" << G4endl << G4endl;
172
173 // Mylar Foil on both sides of helium pipe
174 // (not placed)
175
176 G4double zMylar1 = zPipe - pipeLength / 2. - mylarThick / 2. - 0.001 * mm;
177 G4double zMylar2 = zPipe + pipeLength / 2. + mylarThick / 2. + 0.001 * mm;
178
179 G4cout << "zMylar1 = " << zMylar1 / mm << " mm" << G4endl;
180 G4cout << "zMylar2 = " << zMylar2 / mm << " mm" << G4endl;
181 G4cout << "fMylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
182
183 // Mylar Foil on Chamber
184 // (not placed)
185
186 G4double zMylar = zElectrode2 + electrodeThick / 2. + mylarThick / 2. + 1.0 * mm;
187 zMylar += (pipeLength + pipeDist);
188
189 G4cout << "zMylar = " << zMylar / mm << " mm" << G4endl;
190 G4cout << "mylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
191
192 // Absorber
193
194 G4double absorberZ = zMylar + mylarThick + absorberThickness / 2.;
195
196 G4VSolid* solidAbsorber = new G4Box("Absorber", absorberRadius, 10. * mm, absorberThickness / 2.);
197
198 G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
199
200 new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
201 false, 0);
202
203 G4Region* regGasDet = new G4Region("XTRdEdxDetector");
204 regGasDet->AddRootLogicalVolume(logicAbsorber);
205
206 // Sensitive Detectors: Absorber
207
208 SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
209 G4SDManager::GetSDMpointer()->AddNewDetector(sd);
210 logicAbsorber->SetSensitiveDetector(sd);
211
212 // Print geometry parameters
213
214 G4cout << "\n The WORLD is made of " << worldSizeZ / mm << "mm of "
215 << worldMaterial->GetName();
216 G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
217 G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
218 << absorberMaterial->GetName();
219 G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
220 G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << " mm." << G4endl;
221
222 G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
223 G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
224
225 G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
226 G4cout << "fFoilNumber = " << foilNumber << G4endl;
227 G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
228 G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
229 G4cout << G4endl;
230
231 return physicsWorld;
232 }
233
234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
235