examples/extended/electromagnetic/TestEm18/src/DetectorConstruction.cc

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// $Id: DetectorConstruction.cc 105252 2017-07-17 09:40:37Z gcosmo $
//
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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 "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),fPBox(0), fLBox(0), fMaterial(0),
 fDetectorMessenger(0)
{
  fBoxSize = 1*cm;
  DefineMaterials();
  SetMaterial("Water");  
  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()
{
  //
  // define Elements
  //
  G4double z,a;
  
  G4Element* H  = new G4Element("Hydrogen" ,"H" , z= 1., a=   1.01*g/mole);
  G4Element* N  = new G4Element("Nitrogen" ,"N" , z= 7., a=  14.01*g/mole);
  G4Element* O  = new G4Element("Oxygen"   ,"O" , z= 8., a=  16.00*g/mole);
  
  //
  // define materials
  //
  G4double density;
  G4int ncomponents, natoms;
  G4double fractionmass;  
  
  G4Material* Air = 
  new G4Material("Air", density= 1.290*mg/cm3, ncomponents=2);
  Air->AddElement(N, fractionmass=70.*perCent);
  Air->AddElement(O, fractionmass=30.*perCent);

  G4Material* H2O = 
  new G4Material("Water", density= 1.000*g/cm3, ncomponents=2);
  H2O->AddElement(H, natoms=2);
  H2O->AddElement(O, natoms=1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
  G4Material* vapor = 
  new G4Material("Water_vapor", density= 1.000*mg/cm3, ncomponents=2);
  vapor->AddElement(H, natoms=2);
  vapor->AddElement(O, natoms=1);
  vapor->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
  new G4Material("Carbon"     , z=6.,  a= 12.01*g/mole, density= 2.267*g/cm3);
  new G4Material("Aluminium"  , z=13., a= 26.98*g/mole, density= 2.700*g/cm3);
  new G4Material("Silicon"    , z=14., a= 28.09*g/mole, density= 2.330*g/cm3);
  new G4Material("liquidArgon", z=18., a= 39.95*g/mole, density= 1.390*g/cm3);
  new G4Material("Iron"       , z=26., a= 55.85*g/mole, density= 7.870*g/cm3);  
  new G4Material("Germanium"  , z=32., a= 72.61*g/mole, density= 5.323*g/cm3);
  new G4Material("Tungsten"   , z=74., a=183.85*g/mole, density= 19.30*g/cm3);
  new G4Material("Lead"       , z=82., a=207.19*g/mole, density= 11.35*g/cm3);
  
  new G4Material("ArgonGas"   , z=18., a=39.948*g/mole, density= 1.782*mg/cm3,
                 kStateGas, 273.15*kelvin, 1*atmosphere);
                 
}

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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 "  << fMaterial << G4endl;
}

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void DetectorConstruction::SetMaterial(const G4String& name)
{
  // search the material by its name
  G4Material* mat = G4Material::GetMaterial(name, false);

  // create the material by its name
  if(!mat) { mat = G4NistManager::Instance()->FindOrBuildMaterial(name); }

  if(mat && mat != fMaterial) {
    G4cout << "### New material " << mat->GetName() << G4endl;
    fMaterial = mat;
    UpdateGeometry();
  }

  if(!mat) {
    G4cout << "\n--> warning from DetectorConstruction::SetMaterial : "
           << name << " not found" << G4endl;  
  } 
}

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void DetectorConstruction::SetSize(G4double value)
{
  fBoxSize = value;
  UpdateGeometry();  
}

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#include "G4RunManager.hh"

void DetectorConstruction::UpdateGeometry()
{
  G4RunManager::GetRunManager()->GeometryHasBeenModified();
}

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