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25 //
26 /// \file electromagnetic/TestEm10/src/DetectorHarris73.cc
27 /// \brief Implementation of the DetectorHarris73 class
28 //
29 //
30 //
31 //
32
33 #include "DetectorHarris73.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 DetectorHarris73::DetectorHarris73() : fRadiatorDescription(0) {}
54
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
56
57 DetectorHarris73::~DetectorHarris73()
58 {
59 // delete fRadiatorDescription;
60 // the description is deleted in detector construction
61 }
62
63 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
64
65 G4VPhysicalVolume* DetectorHarris73::Construct()
66 {
67 // Geometry parameters
68 //
69
70 G4cout << "DetectorHarris73 setup" << G4endl;
71
72 G4double worldSizeZ = 400. * cm;
73 G4double worldSizeR = 20. * cm;
74
75 // Radiator and detector parameters
76
77 G4double radThickness = 0.0127 * mm;
78 G4double gasGap = 0.762 * mm;
79 G4double foilGasRatio = radThickness / (radThickness + gasGap);
80 G4double foilNumber = 100;
81
82 G4double absorberThickness = 15.0 * mm;
83 G4double absorberRadius = 100. * mm;
84
85 G4double windowThick = 51.0 * micrometer;
86 G4double electrodeThick = 10.0 * 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* mylar = Materials::GetInstance()->GetMaterial("Mylar");
98 G4Material* kr7ch4 = Materials::GetInstance()->GetMaterial("Kr7CH4");
99
100 // Preparation of mixed radiator material
101
102 G4double foilDensity = mylar->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 = gasDensity * (1.0 - foilGasRatio) / totDensity;
108 G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
109 radiatorMat->AddMaterial(mylar, fractionFoil);
110 radiatorMat->AddMaterial(air, fractionGas);
111
112 // Radiator description
113 fRadiatorDescription = new RadiatorDescription;
114 fRadiatorDescription->fFoilMaterial = mylar; // 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 = kr7ch4;
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 fRadiatorDescription->fLogicalVolume = logicRadiator;
144
145 new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
146 0);
147
148 // create region for radiator
149
150 G4Region* radRegion = new G4Region("XTRradiator");
151 radRegion->AddRootLogicalVolume(logicRadiator);
152
153 G4double windowZ = startZ + radThick + windowThick / 2. + 15.0 * mm;
154
155 G4double gapZ = windowZ + windowThick / 2. + gapThick / 2. + 0.01 * mm;
156
157 G4double electrodeZ = gapZ + gapThick / 2. + electrodeThick / 2. + 0.01 * mm;
158
159 // Absorber
160
161 G4double absorberZ = electrodeZ + electrodeThick / 2. + absorberThickness / 2. + 0.01 * mm;
162
163 G4VSolid* solidAbsorber =
164 new G4Box("Absorber", absorberRadius, absorberRadius, absorberThickness / 2.);
165
166 G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
167
168 new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
169 false, 0);
170
171 G4Region* regGasDet = new G4Region("XTRdEdxDetector");
172 regGasDet->AddRootLogicalVolume(logicAbsorber);
173
174 // Sensitive Detectors: Absorber
175
176 SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
177 G4SDManager::GetSDMpointer()->AddNewDetector(sd);
178 logicAbsorber->SetSensitiveDetector(sd);
179
180 // Print geometry parameters
181
182 G4cout << "\n The WORLD is made of " << worldSizeZ / mm << "mm of "
183 << worldMaterial->GetName();
184 G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
185 G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
186 << absorberMaterial->GetName();
187 G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
188 G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << " mm." << G4endl;
189
190 G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
191 G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
192
193 G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
194 G4cout << "fFoilNumber = " << foilNumber << G4endl;
195 G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
196 G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
197 G4cout << G4endl;
198
199 return physicsWorld;
200 }
201
202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
203