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
//
//

#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4SystemOfUnits.hh"
#include "G4UserLimits.hh"
#include "G4NistManager.hh"
#include "G4RunManager.hh"
#include "G4LogicalVolumeStore.hh"

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DetectorConstruction::DetectorConstruction() :
  G4VUserDetectorConstruction(), fpWaterMaterial(nullptr),
  fLogicWorld(nullptr),fPhysiWorld(nullptr)
{
  // create commands for interactive definition of the detector  
  fDetectorMessenger = new DetectorMessenger(this);
}

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DetectorConstruction::~DetectorConstruction()
{
  delete fDetectorMessenger;
}

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G4VPhysicalVolume* DetectorConstruction::Construct()

{
  if(fPhysiWorld) { return fPhysiWorld; }
  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");

  /*
   If one wishes to test other density value for water material,
   one should use instead:
   G4Material * H2O = man->BuildMaterialWithNewDensity("G4_WATER_MODIFIED",
   "G4_WATER",1.100*g/cm3);

   Note: any string for "G4_WATER_MODIFIED" parameter is accepted
   and "G4_WATER" parameter should not be changed
   Both materials are created and can be selected from dna.mac
   */
  fpWaterMaterial = H2O;

  //G4cout << "-> Density of water material (g/cm3)="
  // << fpWaterMaterial->GetDensity()/(g/cm/cm/cm) << G4endl;

  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{
  // WORLD VOLUME
  G4double worldSizeX = 100 * micrometer;
  G4double worldSizeY = worldSizeX;
  G4double worldSizeZ = worldSizeX;

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

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

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

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

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

  // 
  // Shows how to introduce a 20 eV tracking cut
  //
  //logicWorld->SetUserLimits(new G4UserLimits(DBL_MAX,DBL_MAX,DBL_MAX,20*eV));

  return fPhysiWorld;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // Search the material by its name   
  G4Material* pttoMaterial = G4NistManager::Instance()->FindOrBuildMaterial(
      materialChoice);

  if (pttoMaterial)
  {
    fpWaterMaterial = pttoMaterial;
    if(fLogicWorld) {
      fLogicWorld->SetMaterial(fpWaterMaterial);
    }
    G4RunManager::GetRunManager()->GeometryHasBeenModified();
  }
}