DetectorConstruction.cc

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// $Id: DetectorConstruction.cc 86064 2014-11-07 08:49:32Z gcosmo $

//
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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"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
:fWallMaterial(0),fWall(0),fCavityMaterial(0),fCavity(0),fDetectorMessenger(0)
{
  // default parameter values
  fCavityThickness = 2*mm;
  fCavityRadius    = 1*cm;      
  
  fWallThickness = 5*mm;
  
  DefineMaterials();
  SetWallMaterial("Water");
  SetCavityMaterial("Water_vapor");
  
  // 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()
{ 
  //
  // define Elements
  //
  G4double z,a;
  
  G4Element* H  = new G4Element("Hydrogen" ,"H" , z= 1., a=   1.01*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);

  //
  // define materials
  //  
  G4Material* H2O = 
  new G4Material("Water", 1.0*g/cm3, 2);
  H2O->AddElement(H, 2);
  H2O->AddElement(O, 1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
  G4Material* vapor = 
  new G4Material("Water_vapor", 1.0*mg/cm3, 2);
  vapor->AddElement(H, 2);
  vapor->AddElement(O, 1);
  vapor->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);
  
  G4Material* Air = 
  new G4Material("Air", 1.290*mg/cm3, 2);
  Air->AddElement(N, 70.*perCent);
  Air->AddElement(O, 30.*perCent);
  
  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();
                   
  // Chamber
  //
  fTotalThickness = fCavityThickness + 2*fWallThickness;
  fWallRadius     = fCavityRadius + fWallThickness;
  
  G4Tubs* 
  sChamber = new G4Tubs("Chamber",                                     //name
                         0.,fWallRadius,0.5*fTotalThickness,0.,twopi); //size

  G4LogicalVolume*
  lChamber = new G4LogicalVolume(sChamber,              //solid
                                     fWallMaterial,     //material
                                    "Chamber");         //name
                                   
  fWall = new G4PVPlacement(0,                          //no rotation
                            G4ThreeVector(),            //at (0,0,0)
                            lChamber,                   //logical volume
                            "Wall",                     //name
                            0,                          //mother  volume
                            false,                      //no boolean operation
                            0);                         //copy number

  // Cavity
  //                             
  G4Tubs*
  sCavity = new G4Tubs("Cavity",        
                       0.,fCavityRadius,0.5*fCavityThickness,0.,twopi);
                 
  G4LogicalVolume* 
  lCavity = new G4LogicalVolume(sCavity,                //shape
                                fCavityMaterial,        //material
                                "Cavity");              //name
                                
  fCavity = new G4PVPlacement(0,                        //no rotation
                             G4ThreeVector(),           //at (0,0,0)
                             lCavity,                   //logical volume
                            "Cavity",                   //name
                             lChamber,                  //mother  volume
                             false,                     //no boolean operation
                             1);                        //copy number
                                
  PrintParameters();
    
  //
  //always return the root volume
  //  
  return fWall;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Wall is " << G4BestUnit(fWallThickness,"Length")
         << " of " << fWallMaterial->GetName() << " ( " 
         << G4BestUnit(fWallMaterial->GetDensity(),"Volumic Mass") << " )\n";
  G4cout << "     The Cavity is " << G4BestUnit(fCavityThickness,"Length")
         << " of " << fCavityMaterial->GetName() << " ( " 
         << G4BestUnit(fCavityMaterial->GetDensity(),"Volumic Mass") << " )";
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << G4endl;
}

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void DetectorConstruction::SetWallThickness(G4double value)
{
  fWallThickness = value;
}
  
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void DetectorConstruction::SetWallMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) fWallMaterial = pttoMaterial;
}

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void DetectorConstruction::SetCavityThickness(G4double value)
{
  fCavityThickness = value;
}
  
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void DetectorConstruction::SetCavityRadius(G4double value)
{
  fCavityRadius  = value;
}  

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

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

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