DetectorConstruction.cc

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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"
#include "G4Material.hh"
#include "G4NistManager.hh"

#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"

#include "G4GeometryManager.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4SolidStore.hh"
#include "G4RunManager.hh"

#include "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),
 fPBox(0), fLBox(0), fMaterial(0), fDetectorMessenger(0)
{
  fBoxSize = 1*m;
  DefineMaterials();
  SetMaterial("Water_ts");  
  fDetectorMessenger = new DetectorMessenger(this);
}

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

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  return ConstructVolumes();
}

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void DetectorConstruction::DefineMaterials()
{
  // specific element name for thermal neutronHP
  // (see G4ParticleHPThermalScatteringNames.cc)

  G4int ncomponents, natoms;

  // pressurized water
  G4Element* H  = new G4Element("TS_H_of_Water" ,"H" , 1., 1.0079*g/mole);
  G4Element* O  = new G4Element("Oxygen"        ,"O" , 8., 16.00*g/mole);
  G4Material* H2O = 
  new G4Material("Water_ts", 1.000*g/cm3, ncomponents=2,
                         kStateLiquid, 593*kelvin, 150*bar);
  H2O->AddElement(H, natoms=2);
  H2O->AddElement(O, natoms=1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
  // heavy water
  G4Isotope* H2 = new G4Isotope("H2",1,2);
  G4Element* D  = new G4Element("TS_D_of_Heavy_Water", "D", 1);
  D->AddIsotope(H2, 100*perCent);  
  G4Material* D2O = new G4Material("HeavyWater", 1.11*g/cm3, ncomponents=2,
                        kStateLiquid, 293.15*kelvin, 1*atmosphere);
  D2O->AddElement(D, natoms=2);
  D2O->AddElement(O, natoms=1);
  
  // graphite
  G4Isotope* C12 = new G4Isotope("C12", 6, 12);  
  G4Element* C   = new G4Element("TS_C_of_Graphite","C", ncomponents=1);
  C->AddIsotope(C12, 100.*perCent);
  G4Material* graphite = 
  new G4Material("graphite", 2.27*g/cm3, ncomponents=1,
                         kStateSolid, 293*kelvin, 1*atmosphere);
  graphite->AddElement(C, natoms=1);    
  
}

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G4Material* DetectorConstruction::MaterialWithSingleIsotope( G4String name,
                           G4String symbol, G4double density, G4int Z, G4int A)
{
 // define a material from an isotope
 //
 G4int ncomponents;
 G4double abundance, massfraction;

 G4Isotope* isotope = new G4Isotope(symbol, Z, A);
 
 G4Element* element  = new G4Element(name, symbol, ncomponents=1);
 element->AddIsotope(isotope, abundance= 100.*perCent);
 
 G4Material* material = new G4Material(name, density, ncomponents=1);
 material->AddElement(element, massfraction=100.*perCent);

 return material;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  // Cleanup old geometry
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();

  G4Box*
  sBox = new G4Box("Container",                         //its name
                   fBoxSize/2,fBoxSize/2,fBoxSize/2);   //its dimensions

  fLBox = new G4LogicalVolume(sBox,                     //its shape
                             fMaterial,                 //its material
                             fMaterial->GetName());     //its name

  fPBox = new G4PVPlacement(0,                          //no rotation
                            G4ThreeVector(),            //at (0,0,0)
                            fLBox,                      //its logical volume
                            fMaterial->GetName(),       //its name
                            0,                          //its mother  volume
                            false,                      //no boolean operation
                            0);                         //copy number
                           
  PrintParameters();
  
  //always return the root volume
  //
  return fPBox;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n The Box is " << G4BestUnit(fBoxSize,"Length")
         << " of " << fMaterial->GetName() 
         << "\n \n" << fMaterial << G4endl;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name
  G4Material* pttoMaterial =
     G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);   
  
  if (pttoMaterial) { 
    if(fMaterial != pttoMaterial) {
      fMaterial = pttoMaterial;
      if(fLBox) { fLBox->SetMaterial(pttoMaterial); }
      G4RunManager::GetRunManager()->PhysicsHasBeenModified();
    }
  } else {
    G4cout << "\n--> warning from DetectorConstruction::SetMaterial : "
           << materialChoice << " not found" << G4endl;
  }              
}

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void DetectorConstruction::SetSize(G4double value)
{
  fBoxSize = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

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