DetectorConstruction.cc

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// $Id$

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

#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4UniformMagField.hh"

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

#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

#include "G4NistManager.hh"
#include "G4RunManager.hh"

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

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DetectorConstruction::DetectorConstruction()
:fNLtot(40),fNRtot(50),fDLradl(0.5),fDRradl(0.1),
 fDLlength(0.),fDRlength(0.),
 fMaterial(0),fMagField(0),
 fEcalLength(0.),fEcalRadius(0.),
 fSolidEcal(0),fLogicEcal(0),fPhysiEcal(0)
{
  DefineMaterials();
  SetMaterial("G4_PbWO4");
  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 few Elements by hand
  //
  G4double a, z;
    
  G4Element* H  = new G4Element("Hydrogen",  "H", z= 1., a=   1.01*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;

  // water with ionisation potential 78 eV
  G4Material* H2O = 
  new G4Material("Water", density= 1.00*g/cm3, ncomponents=2);
  H2O->AddElement(H, natoms=2);
  H2O->AddElement(O, natoms=1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);

  // pure materails
  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= 2.7*g/cm3);
  new G4Material("Iron",        z=26., a= 55.85*g/mole, density= 7.87*g/cm3);  
  new G4Material("Copper",      z=29., a= 63.55*g/mole, density= 8.960*g/cm3); 
  new G4Material("Tungsten",    z=74., a=183.84*g/mole, density=19.35*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);

  // compound material
  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);

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

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4double Radl = fMaterial->GetRadlen();

  fDLlength = fDLradl*Radl; fDRlength = fDRradl*Radl;
  fEcalLength = fNLtot*fDLlength;  fEcalRadius = fNRtot*fDRlength;

  // Cleanup old geometry
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();

  //
  // Ecal
  //
  fSolidEcal = new G4Tubs("Ecal",0.,fEcalRadius,0.5*fEcalLength,0.,360*deg);
  fLogicEcal = new G4LogicalVolume( fSolidEcal,fMaterial,"Ecal",0,0,0);
  fPhysiEcal = new G4PVPlacement(0,G4ThreeVector(),
                                fLogicEcal,"Ecal",0,false,0);

  G4cout << "Absorber is " << G4BestUnit(fEcalLength,"Length")
         << " of " << fMaterial->GetName() << G4endl;
  G4cout << fMaterial << G4endl;     

  //
  //always return the physical World
  //
  return fPhysiEcal;
}

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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(fLogicEcal) fLogicEcal->SetMaterial(fMaterial);
    G4RunManager::GetRunManager()->PhysicsHasBeenModified();
  }
}

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void DetectorConstruction::SetLBining(G4ThreeVector Value)
{
  fNLtot = (G4int)Value(0);
  if (fNLtot > MaxBin) {
    G4cout << "\n ---> warning from SetLBining: "
           << fNLtot << " truncated to " << MaxBin << G4endl;
    fNLtot = MaxBin;
  }  
  fDLradl = Value(1);
}

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void DetectorConstruction::SetRBining(G4ThreeVector Value)
{
  fNRtot = (G4int)Value(0);
  if (fNRtot > MaxBin) {
    G4cout << "\n ---> warning from SetRBining: "
           << fNRtot << " truncated to " << MaxBin << G4endl;
    fNRtot = MaxBin;
  }    
  fDRradl = Value(1);
}

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void DetectorConstruction::SetMagField(G4double fieldValue)
{
  //apply a global uniform magnetic field along Z axis
  G4FieldManager* fieldMgr
   = G4TransportationManager::GetTransportationManager()->GetFieldManager();

  if(fMagField) delete fMagField;                //delete the existing magn field

  if(fieldValue!=0.)                        // create a new one if non nul
  { fMagField = new G4UniformMagField(G4ThreeVector(0.,0.,fieldValue));
    fieldMgr->SetDetectorField(fMagField);
    fieldMgr->CreateChordFinder(fMagField);
  } else {
    fMagField = 0;
    fieldMgr->SetDetectorField(fMagField);
  }
}

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

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