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DetectorConstruction.cc
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29 //
30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 
33 #include "DetectorConstruction.hh"
34 #include "DetectorMessenger.hh"
35 
36 #include "G4Material.hh"
37 #include "G4NistManager.hh"
38 #include "G4Tubs.hh"
39 #include "G4LogicalVolume.hh"
40 #include "G4VPhysicalVolume.hh"
41 #include "G4PVPlacement.hh"
42 
43 #include "G4GeometryManager.hh"
44 #include "G4PhysicalVolumeStore.hh"
45 #include "G4LogicalVolumeStore.hh"
46 #include "G4SolidStore.hh"
47 
48 #include "G4UnitsTable.hh"
49 #include "G4PhysicalConstants.hh"
50 #include "G4SystemOfUnits.hh"
51 
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
53 
54 DetectorConstruction::DetectorConstruction()
55  : fWall(nullptr), fCavity(nullptr)
56 {
57  // default parameter values
58  fWallThickness = 5*cm;
59  fCavityThickness = 2*mm;
60  fCavityRadius = 10*m;
61 
62  DefineMaterials();
63  SetWallMaterial("G4_WATER");
64  SetCavityMaterial("g4Water_gas");
65 
66  // create commands for interactive definition of the detector
67  fDetectorMessenger = new DetectorMessenger(this);
68 }
69 
70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
71 
72 DetectorConstruction::~DetectorConstruction()
73 {
74  delete fDetectorMessenger;
75 }
76 
77 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
78 
79 void DetectorConstruction::DefineMaterials()
80 {
81  G4double z,a;
82 
83  G4Element* H = new G4Element("Hydrogen" ,"H" , z= 1., a= 1.01*g/mole);
84  G4Element* O = new G4Element("Oxygen" ,"O" , z= 8., a= 16.00*g/mole);
85 
86  G4Material* H2O =
87  new G4Material("Water", 1.0*g/cm3, 2);
88  H2O->AddElement(H, 2);
89  H2O->AddElement(O, 1);
90  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
91 
92  G4Material* gas =
93  new G4Material("Water_gas", 1.0*mg/cm3, 2);
94  gas->AddElement(H, 2);
95  gas->AddElement(O, 1);
96  gas->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
97 
98  new G4Material("Graphite", 6, 12.01*g/mole, 2.265*g/cm3);
99  new G4Material("Graphite_gas", 6, 12.01*g/mole, 2.265*mg/cm3);
100 
101  new G4Material("Aluminium", 13, 26.98*g/mole, 2.700*g/cm3);
102  new G4Material("Aluminium_gas", 13, 26.98*g/mole, 2.700*mg/cm3);
103 
104  // alternatively, use G4 data base
105  //
106  G4NistManager* nist = G4NistManager::Instance();
107 
108  nist->FindOrBuildMaterial("G4_WATER");
109  nist->BuildMaterialWithNewDensity("g4Water_gas","G4_WATER", 1.0*mg/cm3);
110 
111  // printout
112  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
113 }
114 
115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
116 
117 G4VPhysicalVolume* DetectorConstruction::Construct()
118 {
119  if(fWall) { return fWall; }
120 
121  // Chamber
122  //
123  fTotalThickness = fCavityThickness + 2*fWallThickness;
124  fWallRadius = fCavityRadius;
125 
126  G4Tubs*
127  sChamber = new G4Tubs("Chamber", //name
128  0.,fWallRadius,0.5*fTotalThickness,0.,twopi); //size
129 
130  G4LogicalVolume*
131  lChamber = new G4LogicalVolume(sChamber, //solid
132  fWallMaterial, //material
133  "Chamber"); //name
134 
135  fWall = new G4PVPlacement(0, //no rotation
136  G4ThreeVector(), //at (0,0,0)
137  lChamber, //logical volume
138  "Wall", //name
139  0, //mother volume
140  false, //no boolean operation
141  0); //copy number
142 
143  // Cavity
144  //
145  G4Tubs*
146  sCavity = new G4Tubs("Cavity",
147  0.,fCavityRadius,0.5*fCavityThickness,0.,twopi);
148 
149  G4LogicalVolume*
150  lCavity = new G4LogicalVolume(sCavity, //shape
151  fCavityMaterial, //material
152  "Cavity"); //name
153 
154  fCavity = new G4PVPlacement(0, //no rotation
155  G4ThreeVector(), //at (0,0,0)
156  lCavity, //logical volume
157  "Cavity", //name
158  lChamber, //mother volume
159  false, //no boolean operation
160  1); //copy number
161 
162  PrintParameters();
163 
164  //
165  //always return the root volume
166  //
167  return fWall;
168 }
169 
170 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
171 
172 void DetectorConstruction::PrintParameters()
173 {
174  G4cout << "\n---------------------------------------------------------\n";
175  G4cout << "---> The Wall is " << G4BestUnit(fWallThickness,"Length")
176  << " of " << fWallMaterial->GetName() << " ( "
177  << G4BestUnit(fWallMaterial->GetDensity(),"Volumic Mass") << " )\n";
178  G4cout << " The Cavity is " << G4BestUnit(fCavityThickness,"Length")
179  << " of " << fCavityMaterial->GetName() << " ( "
180  << G4BestUnit(fCavityMaterial->GetDensity(),"Volumic Mass") << " )";
181  G4cout << "\n---------------------------------------------------------\n";
182  G4cout << G4endl;
183 }
184 
185 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
186 
187 void DetectorConstruction::SetWallThickness(G4double value)
188 {
189  fWallThickness = value;
190 }
191 
192 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
193 
194 void DetectorConstruction::SetWallMaterial(const G4String& materialChoice)
195 {
196  // search the material by its name
197  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);
198  if (pttoMaterial) fWallMaterial = pttoMaterial;
199 }
200 
201 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
202 
203 void DetectorConstruction::SetCavityThickness(G4double value)
204 {
205  fCavityThickness = value;
206 }
207 
208 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
209 
210 void DetectorConstruction::SetCavityRadius(G4double value)
211 {
212  fCavityRadius = value;
213 }
214 
215 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
216 
217 void DetectorConstruction::SetCavityMaterial(const G4String& materialChoice)
218 {
219  // search the material by its name
220  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);
221  if (pttoMaterial) fCavityMaterial = pttoMaterial;
222 }
223 
224 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......