DetectorConstruction.cc

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//
// $Id$
//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4NistManager.hh"
#include "G4Sphere.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4UniformMagField.hh"

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

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

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DetectorConstruction::DetectorConstruction()
{
  // default parameter values
  fAbsorRadius = 3*cm;
  fNbOfLayers = 1;
  
  fAbsorMaterial = 0;
  fMagField = 0;
  fAbsor   = 0;
  
  DefineMaterials();
  SetMaterial("G4_WATER");

  // create commands for interactive definition of the detector  
  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()
{ 
  G4NistManager* man = G4NistManager::Instance();
  
  G4bool isotopes = false;
  
  man->FindOrBuildMaterial("G4_Al", isotopes);
  man->FindOrBuildMaterial("G4_Si", isotopes);
  man->FindOrBuildMaterial("G4_Fe", isotopes);
  man->FindOrBuildMaterial("G4_Ge", isotopes);
  man->FindOrBuildMaterial("G4_W" , isotopes);
  man->FindOrBuildMaterial("G4_Pb", isotopes);
  
  man->FindOrBuildMaterial("G4_AIR"  , isotopes);
  man->FindOrBuildMaterial("G4_WATER", isotopes);
  
 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
                   
  // Absorber
  //
  G4Sphere* 
  sAbsor = new G4Sphere("Absorber",                        //name
                     0., fAbsorRadius, 0., twopi, 0., pi);        //size

  G4LogicalVolume*
  lAbsor = new G4LogicalVolume(sAbsor,                        //solid
                                     fAbsorMaterial,                //material
                                    "Absorber");                //name
                                   
  fAbsor = new G4PVPlacement(0,                                //no rotation
                             G4ThreeVector(),                //at (0,0,0)
                             lAbsor,                        //logical volume
                            "Absorber",                        //name
                             0,                                //mother  volume
                             false,                        //no boolean operation
                             0);                        //copy number

  // Layers
  //
  fLayerThickness = fAbsorRadius/fNbOfLayers;
                        
  for (G4int i=1; i<=fNbOfLayers; i++) {                           
    G4Sphere*
    sLayer = new G4Sphere("Layer", (i-1)*fLayerThickness, i*fLayerThickness,
                          0., twopi, 0., pi);
                 
    G4LogicalVolume*                                                                 
    lLayer = new G4LogicalVolume(sLayer,                //shape
                                 fAbsorMaterial,                //material
                                 "Layer");                //name
                                 
             new G4PVPlacement(0,                        //no rotation
                               G4ThreeVector(),                //at (0,0,0)
                               lLayer,                        //logical volume
                               "Layer",                        //name
                               lAbsor,                        //mother  volume
                               false,                        //no boolean operation
                               i);                        //copy number
                                                   
   }                                              

  PrintParameters();
    
  //
  //always return the root volume
  //  
  return fAbsor;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Absorber is a sphere of " 
         << G4BestUnit(fAbsorRadius,"Length") << " radius of "
         << fAbsorMaterial->GetName() << " divided in " << fNbOfLayers 
         << " slices of " << G4BestUnit(fLayerThickness,"Length") << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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void DetectorConstruction::SetRadius(G4double value)
{
  fAbsorRadius = value;
}

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) fAbsorMaterial = pttoMaterial;
}

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void DetectorConstruction::SetNbOfLayers(G4int value)
{
  fNbOfLayers = value; 
}
 
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#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

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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#include "G4RunManager.hh" 
 
void DetectorConstruction::UpdateGeometry()
{
G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
}

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