DetectorConstruction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publication:
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
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// $ID$

#include "DetectorConstruction.hh"
#include "G4SystemOfUnits.hh"
#include "G4Region.hh"
#include "G4ProductionCuts.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),
 fpWaterMaterial(0),fpRegion(0)
{}  

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DetectorConstruction::~DetectorConstruction()
{}

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G4VPhysicalVolume* DetectorConstruction::Construct()

{
  DefineMaterials();
  return ConstructDetector();
}

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void DetectorConstruction::DefineMaterials()
{ 

  // Water is defined from NIST material database
  G4NistManager * man = G4NistManager::Instance();
  G4Material * H2O = man->FindOrBuildMaterial("G4_WATER");

  // Default materials in setup.
  fpWaterMaterial = H2O;

}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{
  // WORLD VOLUME
  G4double worldSizeX  = 1*mm;
  G4double worldSizeY  = 1*mm;
  G4double worldSizeZ  = 1*mm;

  G4VSolid* solidWorld = new G4Box("World",         //its name
                          worldSizeX/2,
                          worldSizeY/2,
                          worldSizeZ/2);  //its size

  G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld,  //its solid
                                    fpWaterMaterial,  //its material
                                    "World");    //its name

  G4VPhysicalVolume* physiWorld = new G4PVPlacement(0,      //no rotation
                                  G4ThreeVector(),  //at (0,0,0)
                                  "World",    //its name
                                  logicWorld,    //its logical volume
                                  0,      //its mother  volume
                                  false,      //no boolean operation
                                  0);      //copy number

  G4double TargetSizeZ =  worldSizeZ*0.05; 

  G4Box* targetSolid = new G4Box("Target",               //its name
                                 worldSizeX/2,
                                 worldSizeY/2,
                                 TargetSizeZ/2);   //its size

  G4LogicalVolume* logicTarget =
      new G4LogicalVolume(targetSolid,  //its solid
                          fpWaterMaterial,  //its material
                          "Target");    //its name

  new G4PVPlacement(0,  //no rotation
                    G4ThreeVector(),  //at (0,0,0)
                    "Target",  //its name
                    logicTarget,  //its logical volume
                    physiWorld,  //its mother  volume
                    false,        //no boolean operation
                    0);           //copy number

  // Visualization attributes
  G4VisAttributes* worldVisAtt =
      new G4VisAttributes(G4Colour(1.0,1.0,1.0)); //White
  worldVisAtt->SetVisibility(true);
  logicWorld->SetVisAttributes(worldVisAtt);

  G4VisAttributes* worldVisAtt1 = new G4VisAttributes(G4Colour(1.0,0.0,0.0));
  worldVisAtt1->SetVisibility(true);
  logicTarget->SetVisAttributes(worldVisAtt1);

  // Create Target G4Region and add logical volume

  fpRegion = new G4Region("Target");

  G4ProductionCuts* cuts = new G4ProductionCuts();

  G4double defCut = 1*nanometer;
  cuts->SetProductionCut(defCut,"gamma");
  cuts->SetProductionCut(defCut,"e-");
  cuts->SetProductionCut(defCut,"e+");
  cuts->SetProductionCut(defCut,"proton");

  fpRegion->SetProductionCuts(cuts);
  fpRegion->AddRootLogicalVolume(logicTarget); 

  return physiWorld;
}