source: trunk/examples/extended/medical/fanoCavity2/src/DetectorConstruction.cc @ 1282

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// $Id: DetectorConstruction.cc,v 1.2 2007/11/05 13:19:16 maire Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $

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

#include "G4Material.hh"
#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4VPhysicalVolume.hh"
#include "G4PVPlacement.hh"

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

#include "G4UnitsTable.hh"

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DetectorConstruction::DetectorConstruction()
:pWall(0), pCavity(0)
{
  // default parameter values
  wallThickness   = 5*cm;  
  cavityThickness = 2*mm;
  worldRadius     = 10*m;    
  
  DefineMaterials();
  SetWallMaterial("Water");
  
  // create commands for interactive definition of the detector  
  detectorMessenger = new DetectorMessenger(this);
}

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

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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* O  = new G4Element("Oxygen"   ,"O" , z= 8., a=  16.00*g/mole);

  //
  // define materials
  //  
  G4Material* H2O = 
  new G4Material("Water", 1.0*g/cm3, 2);
  H2O->AddElement(H, 2);
  H2O->AddElement(O, 1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(75.0*eV);
  
  G4Material* gas = 
  new G4Material("Water_gas", 1.0*mg/cm3, 2);
  gas->AddElement(H, 2);
  gas->AddElement(O, 1);
  gas->GetIonisation()->SetMeanExcitationEnergy(75.0*eV);
  
  new G4Material("Graphite",     6, 12.01*g/mole, 2.265*g/cm3);
  new G4Material("Graphite_gas", 6, 12.01*g/mole, 2.265*mg/cm3);  
  
  new G4Material("Aluminium",     13, 26.98*g/mole, 2.700*g/cm3);
  new G4Material("Aluminium_gas", 13, 26.98*g/mole, 2.700*mg/cm3);  
          
 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
                   
  // Wall
  //
  worldThickness = cavityThickness + 2*wallThickness;
  
  G4Tubs* 
  sWall = new G4Tubs("Wall",                                            //name
                      0.,worldRadius,0.5*worldThickness,0.,twopi);      //size

  G4LogicalVolume*
  lWall = new G4LogicalVolume(sWall,                    //solid
                               wallMaterial,            //material
                              "Wall");                  //name
                                   
  pWall = new G4PVPlacement(0,                          //no rotation
                             G4ThreeVector(),           //at (0,0,0)
                             lWall,                     //logical volume
                            "Wall",                     //name
                             0,                         //mother  volume
                             false,                     //no boolean operation
                             0);                        //copy number

  // Cavity
  //                       
  G4Tubs*
  sCavity = new G4Tubs("Cavity",        
                       0.,worldRadius,0.5*cavityThickness,0.,twopi);
                 
  G4LogicalVolume*                                                            
  lCavity = new G4LogicalVolume(sCavity,                //shape
                                cavityMaterial,         //material
                                "Cavity");              //name
                                
  pCavity = new G4PVPlacement(0,                        //no rotation
                             G4ThreeVector(),           //at (0,0,0)
                             lCavity,                   //logical volume
                            "Cavity",                   //name
                             lWall,                     //mother  volume
                             false,                     //no boolean operation
                             1);                        //copy number
                                
  PrintParameters();
    
  //
  //always return the root volume
  //  
  return pWall;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Wall is " << G4BestUnit(wallThickness,"Length")
         << " of " << wallMaterial->GetName() << " ( " 
         << G4BestUnit(wallMaterial->GetDensity(),"Volumic Mass") << " )\n";
  G4cout << "     The Cavity is " << G4BestUnit(cavityThickness,"Length")
         << " of " << cavityMaterial->GetName() << " ( " 
         << G4BestUnit(cavityMaterial->GetDensity(),"Volumic Mass") << " )";             
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << G4endl;
}
 
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void DetectorConstruction::SetWallMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) wallMaterial = pttoMaterial;
  
  pttoMaterial = G4Material::GetMaterial(materialChoice + "_gas");
  if (pttoMaterial) cavityMaterial = pttoMaterial;       
}

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void DetectorConstruction::SetWallThickness(G4double value)
{
  wallThickness = value;
}

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void DetectorConstruction::SetCavityThickness(G4double value)
{
  cavityThickness = value;
  
}
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void DetectorConstruction::SetWorldRadius(G4double value)
{
  worldRadius = value;
}
  
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#include "G4RunManager.hh" 
 
void DetectorConstruction::UpdateGeometry()
{
G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
}

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