userPrimaryGenerator/src/DetectorConstruction.cc

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0025 //
0026 /// \file DetectorConstruction.cc
0027 /// \brief Implementation of the DetectorConstruction class
0028 //
0029 //
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0032
0033 #include "DetectorConstruction.hh"
0034
0035 #include "G4Box.hh"
0036 #include "G4LogicalVolume.hh"
0037 #include "G4NistManager.hh"
0038 #include "G4PVPlacement.hh"
0039 #include "G4SystemOfUnits.hh"
0040
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0042
0043 DetectorConstruction::DetectorConstruction()
0044 {
0045   fWorldSizeXY = 2 * cm;
0046   fWorldSizeZ = 2 * cm;
0047 }
0048
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0050
0051 G4VPhysicalVolume* DetectorConstruction::Construct()
0052 {
0053   //
0054   // define a material
0055   //
0056   G4Material* Air = G4NistManager::Instance()->FindOrBuildMaterial("G4_AIR");
0057
0058   //
0059   // World
0060   //
0061   G4Box* solidWorld = new G4Box("World",  // its name
0062                                 fWorldSizeXY / 2, fWorldSizeXY / 2, fWorldSizeZ / 2);  // its size
0063
0064   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  // its solid
0065                                                     Air,  // its material
0066                                                     "World");  // its name
0067   G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,  // no rotation
0068                                                     G4ThreeVector(),  // at (0,0,0)
0069                                                     logicWorld,  // its logical volume
0070                                                     "World",  // its name
0071                                                     0,  // its mother  volume
0072                                                     false,  // no boolean operation
0073                                                     0);  // copy number
0074
0075   //
0076   // always return the physical World
0077   //
0078   return physiWorld;
0079 }
0080
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