particleGun/src/DetectorConstruction.cc

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0025 //
0026 /// \file DetectorConstruction.cc
0027 /// \brief Implementation of the DetectorConstruction class
0028
0029 #include "DetectorConstruction.hh"
0030
0031 #include "G4Box.hh"
0032 #include "G4LogicalVolume.hh"
0033 #include "G4NistManager.hh"
0034 #include "G4PVPlacement.hh"
0035 #include "G4SystemOfUnits.hh"
0036
0037 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0038
0039 DetectorConstruction::DetectorConstruction()
0040 {
0041   fWorldSizeXY = 2 * cm;
0042   fWorldSizeZ = 2 * cm;
0043 }
0044
0045 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0046
0047 G4VPhysicalVolume* DetectorConstruction::Construct()
0048 {
0049   //
0050   // define a material
0051   //
0052   G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0053
0054   //
0055   // World
0056   //
0057   G4Box* solidWorld = new G4Box("World",  // its name
0058                                 fWorldSizeXY / 2, fWorldSizeXY / 2, fWorldSizeZ / 2);  // its size
0059
0060   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0061                                                     Air,  // its material
0062                                                     "World");  // its name
0063   G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,  // no rotation
0064                                                     G4ThreeVector(),  // at (0,0,0)
0065                                                     logicWorld,  // its logical volume
0066                                                     "World",  // its name
0067                                                     0,  // its mother  volume
0068                                                     false,  // no boolean operation
0069                                                     0);  // copy number
0070
0071   //
0072   // always return the physical World
0073   //
0074   return physiWorld;
0075 }
0076
0077 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......