B4c/src/DetectorConstruction.cc

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0027 /// \file B4/B4c/src/DetectorConstruction.cc
0028 /// \brief Implementation of the B4c::DetectorConstruction class
0029
0030 #include "DetectorConstruction.hh"
0031
0032 #include "CalorimeterSD.hh"
0033
0034 #include "G4AutoDelete.hh"
0035 #include "G4Box.hh"
0036 #include "G4Colour.hh"
0037 #include "G4GlobalMagFieldMessenger.hh"
0038 #include "G4LogicalVolume.hh"
0039 #include "G4Material.hh"
0040 #include "G4NistManager.hh"
0041 #include "G4PVPlacement.hh"
0042 #include "G4PVReplica.hh"
0043 #include "G4PhysicalConstants.hh"
0044 #include "G4SDManager.hh"
0045 #include "G4SystemOfUnits.hh"
0046 #include "G4VisAttributes.hh"
0047
0048 namespace B4c
0049 {
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 G4ThreadLocal G4GlobalMagFieldMessenger* DetectorConstruction::fMagFieldMessenger = nullptr;
0054
0055 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0056
0057 G4VPhysicalVolume* DetectorConstruction::Construct()
0058 {
0059   // Define materials
0060   DefineMaterials();
0061
0062   // Define volumes
0063   return DefineVolumes();
0064 }
0065
0066 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0067
0068 void DetectorConstruction::DefineMaterials()
0069 {
0070   // Lead material defined using NIST Manager
0071   auto nistManager = G4NistManager::Instance();
0072   nistManager->FindOrBuildMaterial("G4_Pb");
0073
0074   // Liquid argon material
0075   G4double a;  // mass of a mole;
0076   G4double z;  // z=mean number of protons;
0077   G4double density;
0078   new G4Material("liquidArgon", z = 18., a = 39.95 * g / mole, density = 1.390 * g / cm3);
0079   // The argon by NIST Manager is a gas with a different density
0080
0081   // Vacuum
0082   new G4Material("Galactic", z = 1., a = 1.01 * g / mole, density = universe_mean_density,
0083                  kStateGas, 2.73 * kelvin, 3.e-18 * pascal);
0084
0085   // Print materials
0086   G4cout << *(G4Material::GetMaterialTable()) << G4endl;
0087 }
0088
0089 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0090
0091 G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
0092 {
0093   // Geometry parameters
0094   fNofLayers = 10;
0095   G4double absoThickness = 10. * mm;
0096   G4double gapThickness = 5. * mm;
0097   G4double calorSizeXY = 10. * cm;
0098
0099   auto layerThickness = absoThickness + gapThickness;
0100   auto calorThickness = fNofLayers * layerThickness;
0101   auto worldSizeXY = 1.2 * calorSizeXY;
0102   auto worldSizeZ = 1.2 * calorThickness;
0103
0104   // Get materials
0105   auto defaultMaterial = G4Material::GetMaterial("Galactic");
0106   auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
0107   auto gapMaterial = G4Material::GetMaterial("liquidArgon");
0108
0109   if (!defaultMaterial || !absorberMaterial || !gapMaterial) {
0110     G4ExceptionDescription msg;
0111     msg << "Cannot retrieve materials already defined.";
0112     G4Exception("DetectorConstruction::DefineVolumes()", "MyCode0001", FatalException, msg);
0113   }
0114
0115   //
0116   // World
0117   //
0118   auto worldS = new G4Box("World",  // its name
0119                           worldSizeXY / 2, worldSizeXY / 2, worldSizeZ / 2);  // its size
0120
0121   auto worldLV = new G4LogicalVolume(worldS,  // its solid
0122                                      defaultMaterial,  // its material
0123                                      "World");  // its name
0124
0125   auto worldPV = new G4PVPlacement(nullptr,  // no rotation
0126                                    G4ThreeVector(),  // at (0,0,0)
0127                                    worldLV,  // its logical volume
0128                                    "World",  // its name
0129                                    nullptr,  // its mother  volume
0130                                    false,  // no boolean operation
0131                                    0,  // copy number
0132                                    fCheckOverlaps);  // checking overlaps
0133
0134   //
0135   // Calorimeter
0136   //
0137   auto calorimeterS = new G4Box("Calorimeter",  // its name
0138                                 calorSizeXY / 2, calorSizeXY / 2, calorThickness / 2);  // its size
0139
0140   auto calorLV = new G4LogicalVolume(calorimeterS,  // its solid
0141                                      defaultMaterial,  // its material
0142                                      "Calorimeter");  // its name
0143
0144   new G4PVPlacement(nullptr,  // no rotation
0145                     G4ThreeVector(),  // at (0,0,0)
0146                     calorLV,  // its logical volume
0147                     "Calorimeter",  // its name
0148                     worldLV,  // its mother  volume
0149                     false,  // no boolean operation
0150                     0,  // copy number
0151                     fCheckOverlaps);  // checking overlaps
0152
0153   //
0154   // Layer
0155   //
0156   auto layerS = new G4Box("Layer",  // its name
0157                           calorSizeXY / 2, calorSizeXY / 2, layerThickness / 2);  // its size
0158
0159   auto layerLV = new G4LogicalVolume(layerS,  // its solid
0160                                      defaultMaterial,  // its material
0161                                      "Layer");  // its name
0162
0163   new G4PVReplica("Layer",  // its name
0164                   layerLV,  // its logical volume
0165                   calorLV,  // its mother
0166                   kZAxis,  // axis of replication
0167                   fNofLayers,  // number of replica
0168                   layerThickness);  // witdth of replica
0169
0170   //
0171   // Absorber
0172   //
0173   auto absorberS = new G4Box("Abso",  // its name
0174                              calorSizeXY / 2, calorSizeXY / 2, absoThickness / 2);  // its size
0175
0176   auto absorberLV = new G4LogicalVolume(absorberS,  // its solid
0177                                         absorberMaterial,  // its material
0178                                         "AbsoLV");  // its name
0179
0180   new G4PVPlacement(nullptr,  // no rotation
0181                     G4ThreeVector(0., 0., -gapThickness / 2),  // its position
0182                     absorberLV,  // its logical volume
0183                     "Abso",  // its name
0184                     layerLV,  // its mother  volume
0185                     false,  // no boolean operation
0186                     0,  // copy number
0187                     fCheckOverlaps);  // checking overlaps
0188
0189   //
0190   // Gap
0191   //
0192   auto gapS = new G4Box("Gap",  // its name
0193                         calorSizeXY / 2, calorSizeXY / 2, gapThickness / 2);  // its size
0194
0195   auto gapLV = new G4LogicalVolume(gapS,  // its solid
0196                                    gapMaterial,  // its material
0197                                    "GapLV");  // its name
0198
0199   new G4PVPlacement(nullptr,  // no rotation
0200                     G4ThreeVector(0., 0., absoThickness / 2),  // its position
0201                     gapLV,  // its logical volume
0202                     "Gap",  // its name
0203                     layerLV,  // its mother  volume
0204                     false,  // no boolean operation
0205                     0,  // copy number
0206                     fCheckOverlaps);  // checking overlaps
0207
0208   //
0209   // print parameters
0210   //
0211   G4cout << G4endl << "------------------------------------------------------------" << G4endl
0212          << "---> The calorimeter is " << fNofLayers << " layers of: [ " << absoThickness / mm
0213          << "mm of " << absorberMaterial->GetName() << " + " << gapThickness / mm << "mm of "
0214          << gapMaterial->GetName() << " ] " << G4endl
0215          << "------------------------------------------------------------" << G4endl;
0216
0217   //
0218   // Visualization attributes
0219   //
0220   worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());
0221   calorLV->SetVisAttributes(G4VisAttributes(G4Colour::White()));
0222
0223   //
0224   // Always return the physical World
0225   //
0226   return worldPV;
0227 }
0228
0229 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0230
0231 void DetectorConstruction::ConstructSDandField()
0232 {
0233   // G4SDManager::GetSDMpointer()->SetVerboseLevel(1);
0234
0235   //
0236   // Sensitive detectors
0237   //
0238   auto absoSD = new CalorimeterSD("AbsorberSD", "AbsorberHitsCollection", fNofLayers);
0239   G4SDManager::GetSDMpointer()->AddNewDetector(absoSD);
0240   SetSensitiveDetector("AbsoLV", absoSD);
0241
0242   auto gapSD = new CalorimeterSD("GapSD", "GapHitsCollection", fNofLayers);
0243   G4SDManager::GetSDMpointer()->AddNewDetector(gapSD);
0244   SetSensitiveDetector("GapLV", gapSD);
0245
0246   //
0247   // Magnetic field
0248   //
0249   // Create global magnetic field messenger.
0250   // Uniform magnetic field is then created automatically if
0251   // the field value is not zero.
0252   G4ThreeVector fieldValue;
0253   fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
0254   fMagFieldMessenger->SetVerboseLevel(1);
0255
0256   // Register the field messenger for deleting
0257   G4AutoDelete::Register(fMagFieldMessenger);
0258 }
0259
0260 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0261
0262 }  // namespace B4c