GB05/src/GB05DetectorConstruction.cc

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0025 //
0026 /// \file GB05DetectorConstruction.cc
0027 /// \brief Implementation of the GB05DetectorConstruction class
0028
0029 #include "GB05DetectorConstruction.hh"
0030
0031 #include "GB05BOptrSplitAndKillByCrossSection.hh"
0032 #include "GB05SD.hh"
0033
0034 #include "G4Box.hh"
0035 #include "G4LogicalVolume.hh"
0036 #include "G4LogicalVolumeStore.hh"
0037 #include "G4Material.hh"
0038 #include "G4NistManager.hh"
0039 #include "G4PVPlacement.hh"
0040 #include "G4SDManager.hh"
0041 #include "G4SystemOfUnits.hh"
0042
0043 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0044
0045 GB05DetectorConstruction::GB05DetectorConstruction(G4bool bf) : fBiasingFlag(bf) {}
0046
0047 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0048
0049 GB05DetectorConstruction::~GB05DetectorConstruction() = default;
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 G4VPhysicalVolume* GB05DetectorConstruction::Construct()
0054 {
0055   // -- Collect a few materials from NIST database:
0056   auto nistManager = G4NistManager::Instance();
0057   G4Material* worldMaterial = nistManager->FindOrBuildMaterial("G4_Galactic");
0058   G4Material* defaultMaterial = nistManager->FindOrBuildMaterial("G4_CONCRETE");
0059
0060   G4VSolid* solidWorld = new G4Box("World", 10 * m, 10 * m, 10 * m);
0061
0062   auto logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0063                                         worldMaterial,  // its material
0064                                         "World");  // its name
0065
0066   auto physiWorld = new G4PVPlacement(nullptr,  // no rotation
0067                                       G4ThreeVector(),  // at (0,0,0)
0068                                       logicWorld,  // its logical volume
0069                                       "World",  // its name
0070                                       nullptr,  // its mother volume
0071                                       false,  // no boolean operation
0072                                       0);  // copy number
0073
0074   // -----------------------------------
0075   // -- volume where biasing is applied:
0076   // -----------------------------------
0077   G4double halfXY = 5.0 * m;
0078   G4double halfZ = 1.0 * m;
0079   G4VSolid* solidShield = new G4Box("shield.solid", halfXY, halfXY, halfZ);
0080
0081   auto logicShield = new G4LogicalVolume(solidShield,  // its solid
0082                                          defaultMaterial,  // its material
0083                                          "shield.logical");  // its name
0084
0085   new G4PVPlacement(nullptr,  // no rotation
0086                     G4ThreeVector(0, 0, halfZ),  // volume entrance at (0,0,0)
0087                     logicShield,  // its logical volume
0088                     "shield.phys",  // its name
0089                     logicWorld,  // its mother  volume
0090                     false,  // no boolean operation
0091                     0);  // copy number
0092
0093   // --------------------------------------------------------------------
0094   // -- dummy volume to print information on particle exiting the shield:
0095   // --------------------------------------------------------------------
0096   G4double halfz = 1 * cm;
0097   G4VSolid* solidMeasurement = new G4Box("meas.solid", halfXY, halfXY, halfz);
0098
0099   auto logicMeasurement = new G4LogicalVolume(solidMeasurement,  // its solid
0100                                               worldMaterial,  // its material
0101                                               "meas.logical");  // its name
0102
0103   new G4PVPlacement(nullptr,  // no rotation
0104                     G4ThreeVector(0, 0, 2 * halfZ + halfz),  // volume entrance at (0,0,0)
0105                     logicMeasurement,  // its logical volume
0106                     "meas.phys",  // its name
0107                     logicWorld,  // its mother  volume
0108                     false,  // no boolean operation
0109                     0);  // copy number
0110
0111   return physiWorld;
0112 }
0113
0114 void GB05DetectorConstruction::ConstructSDandField()
0115 {
0116   if (fBiasingFlag) {
0117     // -- Fetch volume for biasing:
0118     G4LogicalVolume* logicShield = G4LogicalVolumeStore::GetInstance()->GetVolume("shield.logical");
0119
0120     // -------------------------------------------------------------
0121     // -- operator creation, configuration and attachment to volume:
0122     // -------------------------------------------------------------
0123     auto biasingOperator = new GB05BOptrSplitAndKillByCrossSection("neutron");
0124     // -- Now, we declare to our biasing operator all the processes we
0125     // -- their disapperance effect on neutrons to be counterbalanced
0126     // -- by the splitting by cross-section :
0127     biasingOperator->AddProcessToEquipoise("Decay");
0128     biasingOperator->AddProcessToEquipoise("nCapture");
0129     biasingOperator->AddProcessToEquipoise("neutronInelastic");
0130
0131     biasingOperator->AttachTo(logicShield);
0132
0133     G4cout << " Attaching biasing operator " << biasingOperator->GetName() << " to logical volume "
0134            << biasingOperator->GetName() << G4endl;
0135   }
0136   // ------------------------------------------------------------------------------------
0137   // -- Attach a sensitive detector to print information on particles exiting the shield:
0138   // ------------------------------------------------------------------------------------
0139   // -- create and register sensitive detector code module:
0140   G4SDManager* SDman = G4SDManager::GetSDMpointer();
0141   G4VSensitiveDetector* sd = new GB05SD("Scorer");
0142   SDman->AddNewDetector(sd);
0143   // -- Fetch volume for sensitivity and attach sensitive module to it:
0144   G4LogicalVolume* logicSD = G4LogicalVolumeStore::GetInstance()->GetVolume("meas.logical");
0145   logicSD->SetSensitiveDetector(sd);
0146 }