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25 //
26 /// \file electromagnetic/TestEm10/src/DetectorBarr90.cc
27 /// \brief Implementation of the DetectorBarr90 class
28 //
29 //
30 //
31 //
32
33 #include "DetectorBarr90.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 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
52
53 DetectorBarr90::DetectorBarr90() : fRadiatorDescription(0) {}
54
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56
57 DetectorBarr90::~DetectorBarr90()
58 {
59 // delete fRadiatorDescription;
60 // the description is deleted in detector construction
61 }
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65 G4VPhysicalVolume* DetectorBarr90::Construct()
66 {
67 // Geometry parameters
68 //
69
70 G4cout << "DetectorBarr90 setup" << G4endl;
71
72 G4double worldSizeZ = 400. * cm;
73 G4double worldSizeR = 20. * cm;
74
75 // Radiator and detector parameters
76
77 G4double radThickness = 0.019 * mm;
78 G4double gasGap = 0.6 * mm;
79 G4double foilGasRatio = radThickness / (radThickness + gasGap);
80 G4double foilNumber = 350;
81
82 G4double absorberThickness = 50.0 * mm;
83 G4double absorberRadius = 100. * mm;
84
85 G4double electrodeThick = 10.0 * micrometer;
86 G4double windowThick = 51.0 * micrometer;
87 G4double gapThick = 10.0 * cm;
88 G4double detGap = 0.01 * mm;
89
90 G4double startZ = 100.0 * mm;
91
92 // Materials
93 //
94
95 // Change to create materials using NIST
96 G4Material* air = Materials::GetInstance()->GetMaterial("Air");
97 G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
98 G4Material* co2 = Materials::GetInstance()->GetMaterial("CO2");
99 G4Material* xe55he15ch4 = Materials::GetInstance()->GetMaterial("Xe55He15CH4");
100
101 G4double foilDensity = ch2->GetDensity();
102 G4double gasDensity = co2->GetDensity();
103 G4double totDensity = foilDensity * foilGasRatio + gasDensity * (1.0 - foilGasRatio);
104
105 G4double fractionFoil = foilDensity * foilGasRatio / totDensity;
106 G4double fractionGas = gasDensity * (1.0 - foilGasRatio) / totDensity;
107 G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
108 radiatorMat->AddMaterial(ch2, fractionFoil);
109 radiatorMat->AddMaterial(co2, fractionGas);
110
111 // Radiator description
112 fRadiatorDescription = new RadiatorDescription;
113 fRadiatorDescription->fFoilMaterial = ch2; // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
114 fRadiatorDescription->fGasMaterial = co2; // CO2; // He; //
115 fRadiatorDescription->fFoilThickness = radThickness;
116 fRadiatorDescription->fGasThickness = gasGap;
117 fRadiatorDescription->fFoilNumber = foilNumber;
118
119 G4Material* worldMaterial = air; // CO2;
120 G4Material* absorberMaterial = xe55he15ch4;
121
122 // Volumes
123 //
124
125 G4VSolid* solidWorld = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ / 2.);
126
127 G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, worldMaterial, "World");
128
129 G4VPhysicalVolume* physicsWorld =
130 new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
131
132 // TR radiator envelope
133
134 G4double radThick = foilNumber * (radThickness + gasGap) - gasGap + detGap;
135 G4double radZ = startZ + 0.5 * radThick;
136
137 G4VSolid* solidRadiator =
138 new G4Box("Radiator", 1.1 * absorberRadius, 1.1 * absorberRadius, 0.5 * radThick);
139
140 G4LogicalVolume* logicRadiator = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
141
142 new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
143 0);
144
145 fRadiatorDescription->fLogicalVolume = logicRadiator;
146
147 // create region for radiator
148
149 G4Region* radRegion = new G4Region("XTRradiator");
150 radRegion->AddRootLogicalVolume(logicRadiator);
151
152 G4double windowZ = startZ + radThick + windowThick / 2. + 15.0 * mm;
153
154 G4double gapZ = windowZ + windowThick / 2. + gapThick / 2. + 0.01 * mm;
155
156 G4double electrodeZ = gapZ + gapThick / 2. + electrodeThick / 2. + 0.01 * mm;
157
158 // Absorber
159
160 G4double absorberZ = electrodeZ + electrodeThick / 2. + +absorberThickness / 2. + 0.01 * mm;
161
162 G4VSolid* solidAbsorber =
163 new G4Box("Absorber", absorberRadius, absorberRadius, absorberThickness / 2.);
164
165 G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
166
167 new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
168 false, 0);
169
170 G4Region* regGasDet = new G4Region("XTRdEdxDetector");
171 regGasDet->AddRootLogicalVolume(logicAbsorber);
172
173 // Sensitive Detectors: Absorber
174
175 SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
176 G4SDManager::GetSDMpointer()->AddNewDetector(sd);
177 logicAbsorber->SetSensitiveDetector(sd);
178
179 // Print geometry parameters
180
181 G4cout << "\n The WORLD is made of " << worldSizeZ / mm << "mm of "
182 << worldMaterial->GetName();
183 G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
184 G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
185 << absorberMaterial->GetName();
186 G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
187 G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << " mm." << G4endl;
188
189 G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
190 G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
191
192 G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
193 G4cout << "fFoilNumber = " << foilNumber << G4endl;
194 G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
195 G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
196 G4cout << G4endl;
197
198 return physicsWorld;
199 }
200
201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
202