microdosimetry/src/DetectorConstruction.cc

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0026 // This example is provided by the Geant4-DNA collaboration
0027 // Any report or published results obtained using the Geant4-DNA software
0028 // shall cite the following Geant4-DNA collaboration publications:
0029 // Med. Phys. 45, (2018) e722-e739
0030 // Phys. Med. 31 (2015) 861-874
0031 // Med. Phys. 37 (2010) 4692-4708
0032 // Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
0033 // The Geant4-DNA web site is available at http://geant4-dna.org
0034 //
0035 //
0036 /// \file DetectorConstruction.cc
0037 /// \brief Implementation of the DetectorConstruction class
0038
0039 #include "DetectorConstruction.hh"
0040
0041 #include "DetectorMessenger.hh"
0042 #include "PhysicsList.hh"
0043
0044 #include "G4LogicalVolume.hh"
0045 #include "G4RunManager.hh"
0046 #include "G4SystemOfUnits.hh"
0047
0048 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0049
0050 DetectorConstruction::DetectorConstruction(PhysicsList* ptr)
0051   : G4VUserDetectorConstruction(),
0052     fpWaterMaterial(nullptr),
0053     fLogicWorld(nullptr),
0054     fPhysiWorld(nullptr)
0055 {
0056   fDetectorMessenger = new DetectorMessenger(this, ptr);
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0060
0061 DetectorConstruction::~DetectorConstruction()
0062 {
0063   delete fDetectorMessenger;
0064 }
0065
0066 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0067
0068 void DetectorConstruction::DefineMaterials()
0069 {
0070   // Water is defined from NIST material database
0071   G4NistManager* man = G4NistManager::Instance();
0072
0073   G4Material* H2O = man->FindOrBuildMaterial("G4_WATER");
0074
0075   /*
0076    If one wishes to test other density value for water material,
0077    one should use instead:
0078    G4Material * H2O = man->BuildMaterialWithNewDensity("G4_WATER_MODIFIED",
0079    "G4_WATER",1.100*g/cm3);
0080
0081    Note: any string for "G4_WATER_MODIFIED" parameter is accepted
0082    and "G4_WATER" parameter should not be changed
0083    Both materials are created and can be selected from dna.mac
0084   */
0085   fpWaterMaterial = H2O;
0086
0087   // G4cout << "-> Density of water material (g/cm3)="
0088   //  << fpWaterMaterial->GetDensity()/(g/cm/cm/cm) << G4endl;
0089
0090   G4cout << *(G4Material::GetMaterialTable()) << G4endl;
0091 }
0092
0093 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
0094
0095 G4VPhysicalVolume* DetectorConstruction::Construct()
0096 {
0097   if (fPhysiWorld) {
0098     return fPhysiWorld;
0099   }
0100   DefineMaterials();
0101
0102   // World volume
0103
0104   G4double worldSizeX = 10 * micrometer;
0105   G4double worldSizeY = worldSizeX;
0106   G4double worldSizeZ = worldSizeX;
0107
0108   G4Box* solidWorld = new G4Box("World",  // its name
0109                                 worldSizeX / 2, worldSizeY / 2, worldSizeZ / 2);  // its size
0110
0111   fLogicWorld = new G4LogicalVolume(solidWorld,  // its solid
0112                                     fpWaterMaterial,  // its material
0113                                     "World");  // its name
0114
0115   fPhysiWorld = new G4PVPlacement(0,  // no rotation
0116                                   G4ThreeVector(),  // at (0,0,0)
0117                                   "World",  // its name
0118                                   fLogicWorld,  // its logical volume
0119                                   0,  // its mother  volume
0120                                   false,  // no boolean operation
0121                                   0);  // copy number
0122
0123   // Target volume
0124
0125   G4Box* solidTarget = new G4Box("volumeTarget",  // its name
0126                                  worldSizeX / 10, worldSizeY / 2, worldSizeZ / 2);  // its size
0127
0128   fLogicTarget = new G4LogicalVolume(solidTarget,  // its solid
0129                                      fpWaterMaterial,  // its material
0130                                      "volumeTarget");  // its name
0131
0132   fPhysiTarget = new G4PVPlacement(0,  // no rotation
0133                                    G4ThreeVector(),  // at (0,0,0)
0134                                    "volumeTarget",  // its name
0135                                    fLogicTarget,  // its logical volume
0136                                    fPhysiWorld,  // its mother  volume
0137                                    false,  // no boolean operation
0138                                    0);  // copy number
0139
0140   // Target region
0141
0142   G4Region* targetRegion = new G4Region("regionTarget");
0143
0144   // Cuts needed to allow combination of Physics
0145   // Default EM settings for fast simulation for e+, e-, gammas
0146   // 1 um proton cut avoids creation of very slow recoil ions
0147   G4ProductionCuts* cuts = new G4ProductionCuts();
0148   cuts->SetProductionCut(0.7 * mm, "gamma");
0149   cuts->SetProductionCut(0.7 * mm, "e-");
0150   cuts->SetProductionCut(0.7 * mm, "e+");
0151   cuts->SetProductionCut(1 * micrometer, "proton");
0152   targetRegion->SetProductionCuts(cuts);
0153
0154   targetRegion->AddRootLogicalVolume(fLogicTarget);
0155
0156   // Visualization attributes - white
0157   G4VisAttributes* worldVisAtt = new G4VisAttributes(G4Colour(1.0, 1.0, 1.0));
0158   worldVisAtt->SetVisibility(true);
0159   fLogicWorld->SetVisAttributes(worldVisAtt);
0160
0161   G4VisAttributes* targetVisAtt = new G4VisAttributes(G4Colour(1.0, 0.0, 0.0));
0162   targetVisAtt->SetVisibility(true);
0163   fLogicTarget->SetVisAttributes(targetVisAtt);
0164
0165   return fPhysiWorld;
0166 }
0167
0168 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0169
0170 void DetectorConstruction::SetMaterial(const G4String& materialChoice)
0171 {
0172   // Search the material by its name
0173   G4Material* pttoMaterial = G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
0174
0175   if (pttoMaterial) {
0176     fpWaterMaterial = pttoMaterial;
0177     if (fLogicWorld) {
0178       fLogicWorld->SetMaterial(fpWaterMaterial);
0179     }
0180     G4RunManager::GetRunManager()->GeometryHasBeenModified();
0181   }
0182 }