DetectorConstruction.cc

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// $Id: DetectorConstruction.cc 77251 2013-11-22 10:06:41Z 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 "G4UniformMagField.hh"

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

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

#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"
#include "G4RunManager.hh"


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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),
 fPBox(0), fLBox(0), fMaterial(0), fMagField(0), fDetectorMessenger(0)
{
  fBoxSize = 10*m;
  DefineMaterials();
  SetMaterial("Molybdenum98");  
  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 a Material from isotopes
 //
 MaterialWithSingleIsotope("Molybdenum98", "Mo98",  10.28*g/cm3, 42, 98);
    
 // or use G4-NIST materials data base
 //
 G4NistManager* man = G4NistManager::Instance();
 man->FindOrBuildMaterial("G4_B");

}

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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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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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