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/// \file electromagnetic/TestEm1/src/DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class
//
// 

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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 "G4RunManager.hh"

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

#include "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"

#include "G4GlobalMagFieldMessenger.hh"
#include "G4AutoDelete.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),fPBox(nullptr), fLBox(nullptr), 
  fBox(nullptr), fMaterial(nullptr)
{
  fBoxSize = 10*m;
  DefineMaterials();
  SetMaterial("G4_Al");  
  fDetectorMessenger = new DetectorMessenger(this);
}

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

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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* C  = new G4Element("Hydrogen" ,"C" , z= 6., a=  12.00*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);
  G4Element* Ge = new G4Element("Germanium","Ge", z=32., a=  72.59*g/mole);
  G4Element* Bi = new G4Element("Bismuth"  ,"Bi", z=83., a= 208.98*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* H2l = 
  new G4Material("H2liquid", density= 70.8*mg/cm3, ncomponents=1);
  H2l->AddElement(H, fractionmass=1.);

  G4Material* H2O = 
  new G4Material("Water", density= 1.000*g/cm3, ncomponents=2);
  H2O->AddElement(H, natoms=2);
  H2O->AddElement(O, natoms=1);
  ///H2O->SetChemicalFormula("H_2O");
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);

  density = 0.001*mg/cm3;
  G4Material* CO2 = new G4Material("CO2", density, ncomponents=2);
  CO2->AddElement(C, natoms=1);
  CO2->AddElement(O, natoms=2);

  G4Isotope* d = new G4Isotope("d", 1, 2, 0.0, 0);
  G4Element* D = new G4Element("Heavy-Hydrogen" ,"D", ncomponents=1);
  D->AddIsotope(d, 1.0);
  G4Material* D2 = 
    new G4Material("D2_gas", density= 0.036*mg/cm3, ncomponents=1);
  D2->AddElement(D, natoms=2);

  new G4Material("liquidArgon", z=18., a= 39.95*g/mole, density= 1.390*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("Chromium"   , z=24., a= 51.99*g/mole, density= 7.140*g/cm3);
  
  new G4Material("Germanium"  , z=32., a= 72.61*g/mole, density= 5.323*g/cm3);
  
  G4Material* BGO = 
  new G4Material("BGO", density= 7.10*g/cm3, ncomponents=3);
  BGO->AddElement(O , natoms=12);
  BGO->AddElement(Ge, natoms= 3);
  BGO->AddElement(Bi, natoms= 4);  

  new G4Material("Iron"       , z=26., a= 55.85*g/mole, density= 7.870*g/cm3);

  new G4Material("Tungsten"   , z=74., a=183.85*g/mole, density= 19.30*g/cm3);
  
  new G4Material("Gold"       , z=79., a=196.97*g/mole, density= 19.32*g/cm3);
  
  new G4Material("Lead"       , z=82., a=207.19*g/mole, density= 11.35*g/cm3);

  new G4Material("Uranium"    , z=92., a=238.03*g/mole, density= 18.95*g/cm3);

  
  G4Material* argonGas =   
  new G4Material("ArgonGas", z=18, a=39.948*g/mole, density= 1.782*mg/cm3,
                 kStateGas, 273.15*kelvin, 1*atmosphere);
                       
 G4Material* butane =
 new G4Material("Isobutane",density= 2.42*mg/cm3, ncomponents=2,
                 kStateGas,273.15*kelvin, 1*atmosphere);
 butane->AddElement(C, natoms=4);
 butane->AddElement(H, natoms=10);
 
 G4Material* ArButane =
 new G4Material("ArgonButane", density= 1.835*mg/cm3, ncomponents=2,
                 kStateGas,273.15*kelvin,1.*atmosphere);
 ArButane->AddMaterial(argonGas, fractionmass=70*perCent);
 ArButane->AddMaterial(butane ,  fractionmass=30*perCent);

 // example of vacuum
 //
 density = universe_mean_density;    //from PhysicalConstants.h
 new G4Material("Galactic", z=1., a=1.008*g/mole, density,
                            kStateGas,2.73*kelvin,3.e-18*pascal);

 // use Nist
 //
 G4NistManager* man = G4NistManager::Instance();
 
 G4bool isotopes = false;
 ///G4Element*  O = man->FindOrBuildElement("O" , isotopes); 
 G4Element* Si = man->FindOrBuildElement("Si", isotopes);
 G4Element* Lu = man->FindOrBuildElement("Lu", isotopes);  
 
 G4Material* LSO = new G4Material("Lu2SiO5", 7.4*g/cm3, 3);
 LSO->AddElement(Lu, 2);
 LSO->AddElement(Si, 1);
 LSO->AddElement(O , 5);
   
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  if(fPBox) { return fPBox; }
  fBox = new G4Box("Container",                         //its name
                   fBoxSize/2,fBoxSize/2,fBoxSize/2);   //its dimensions

  fLBox = new G4LogicalVolume(fBox,                     //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() << G4endl;
}

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

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void DetectorConstruction::SetSize(G4double value)
{
  fBoxSize = value;
  if(fBox) {
    fBox->SetXHalfLength(fBoxSize/2);
    fBox->SetYHalfLength(fBoxSize/2);
    fBox->SetZHalfLength(fBoxSize/2);
  }
}

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void DetectorConstruction::ConstructSDandField()
{
    if ( fFieldMessenger.Get() == 0 ) {
        // Create global magnetic field messenger.
        // Uniform magnetic field is then created automatically if
        // the field value is not zero.
        G4ThreeVector fieldValue = G4ThreeVector();
        G4GlobalMagFieldMessenger* msg =
        new G4GlobalMagFieldMessenger(fieldValue);
        //msg->SetVerboseLevel(1);
        G4AutoDelete::Register(msg);
        fFieldMessenger.Put( msg );
        
    }
}

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