examples/extended/electromagnetic/TestEm7/src/DetectorConstruction.cc

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/// \file electromagnetic/TestEm7/src/DetectorConstruction.cc
/// \brief Implementation of the DetectorConstruction class
//
// $Id: DetectorConstruction.cc 68263 2013-03-20 10:16:46Z maire $
//
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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"

#include "G4Material.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 "G4NistManager.hh"
#include "G4UnitsTable.hh"

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

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

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DetectorConstruction::DetectorConstruction()
: G4VUserDetectorConstruction(),
  fWorldMaterial(0),fAbsorMaterial(0),fMagField(0),fLAbsor(0),
  fDetectorMessenger(0)
{
  // default parameter values
  fAbsorSizeX = fAbsorSizeYZ = 20*cm;
  fWorldSizeX = fWorldSizeYZ = 1.2*fAbsorSizeX;
  
  fWorldMaterial = fAbsorMaterial = 0;
  fMagField = 0;
  fLAbsor   = 0;
  
  fTallyNumber   = 0;
  for (G4int j=0; j<MaxTally; j++) {
     fTallySize[j] = fTallyPosition[j] = G4ThreeVector();
     fTallyMaterial[j] = 0;
     fTallyMass[j]     = 0.;
     fLTally[j]        = 0;        
  }
    
  DefineMaterials();
  SetMaterial("Water");
  for (G4int j=0; j<MaxTally; j++) { SetTallyMaterial(j,"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()
{ 
  //
  // define Elements
  //
  G4double z, a;

  G4Element* H = new G4Element("Hydrogen", "H", z= 1, a= 1.008*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.
  //
  G4double density, temperature, pressure;
  G4int    ncomponents, natoms;
  G4double fractionmass;
 
  G4Material* H2O = 
    new G4Material("Water", density= 1.0*g/cm3, ncomponents=2);
  H2O->AddElement(H, natoms=2);
  H2O->AddElement(O, natoms=1);
  H2O->GetIonisation()->SetMeanExcitationEnergy(78.0*eV);

  // In this line both G4_WATER and Water_1.05 will be constructed
  G4NistManager::Instance()->
    BuildMaterialWithNewDensity("Water_1.05","G4_WATER",1.05*g/cm3);

  G4Material* Air = 
    new G4Material("Air"  , density= 1.290*mg/cm3, ncomponents=2);
  Air->AddElement(N, fractionmass=0.7);
  Air->AddElement(O, fractionmass=0.3);

  density     = 1.e-5*g/cm3;
  pressure    = 2.e-2*bar;
  temperature = STP_Temperature;  // From PhysicalConstants.h .
  G4Material* vac = new G4Material( "TechVacuum", density, 1,
                           kStateGas, temperature, pressure );
  vac->AddMaterial( Air, 1. );

  density     = universe_mean_density;    //from PhysicalConstants.h
  pressure    = 3.e-18*pascal;
  temperature = 2.73*kelvin;
  G4Material* vacuum = 
    new G4Material("Galactic",z= 1,a= 1.008*g/mole,density,
                   kStateGas,temperature,pressure);

  //default materials
  fWorldMaterial = vacuum;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();

  // World
  //
  G4Box*
  sWorld = new G4Box("World",                                      //name
                   fWorldSizeX/2,fWorldSizeYZ/2,fWorldSizeYZ/2);   //dimensions

  G4LogicalVolume*
  lWorld = new G4LogicalVolume(sWorld,                        //shape
                               fWorldMaterial,                //material
                              "World");                       //name

  G4VPhysicalVolume*                                   
  pWorld = new G4PVPlacement(0,                           //no rotation
                             G4ThreeVector(),             //at (0,0,0)
                             lWorld,                      //logical volume
                             "World",                     //name
                             0,                           //mother  volume
                             false,                       //no boolean operation
                             0);                          //copy number
  //                           
  // Absorber
  //                           
  G4Box*
  sAbsor = new G4Box("Absorber",                                 //name
                   fAbsorSizeX/2,fAbsorSizeYZ/2,fAbsorSizeYZ/2); //dimensions
                                                                 
  fLAbsor = new G4LogicalVolume(sAbsor,                   //shape
                               fAbsorMaterial,            //material
                              "Absorber");                //name
  
                              
           new G4PVPlacement(0,                          //no rotation
                             G4ThreeVector(),            //at (0,0,0)
                            fLAbsor,                     //logical volume
                            "Absorber",                  //name
                            lWorld,                      //mother  volume
                            false,                       //no boolean operation
                            0);                          //copy number
  //
  // Tallies (optional)
  //
  if (fTallyNumber > 0) {
    for (G4int j=1; j<=fTallyNumber; j++) {
            
       G4Box* sTally = new G4Box("Tally",
                   fTallySize[j].x()/2,fTallySize[j].y()/2,fTallySize[j].z()/2);
                      
       fLTally[j] = new G4LogicalVolume(sTally,fTallyMaterial[j],"Tally");
           
       new G4PVPlacement(0,                        //no rotation
                         fTallyPosition[j],        //position
                         fLTally[j],               //logical volume
                         "Tally",                  //name
                         fLAbsor,                  //mother  volume
                         false,                    //no boolean operation
                         j);                       //copy number
       
      fTallyMass[j] = fTallySize[j].x()*fTallySize[j].y()*fTallySize[j].z()
               *(fTallyMaterial[j]->GetDensity());
    }               
  } 

  PrintParameters();
    
  //
  //always return the World volume
  //  
  return pWorld;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The Absorber is " << G4BestUnit(fAbsorSizeX,"Length")
         << " of " << fAbsorMaterial->GetName() << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
  
  if (fTallyNumber > 0) {
    G4cout << "---> There are " << fTallyNumber << " tallies : " << G4endl;    
    for (G4int j=1; j<=fTallyNumber; j++) {
      G4cout << "fTally " << j << ": "
             << fTallyMaterial[j]->GetName()
             << ",  mass = " << G4BestUnit(fTallyMass[j],"Mass")
             << " size = "   << G4BestUnit(fTallySize[j],"Length")           
             << " position = " << G4BestUnit(fTallyPosition[j],"Length")
             << G4endl;
    }                 
    G4cout << "\n---------------------------------------------------------\n";
  }  
}

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void DetectorConstruction::SetSizeX(G4double value)
{
  fAbsorSizeX = value; fWorldSizeX = 1.2*fAbsorSizeX;
  G4RunManager::GetRunManager()->GeometryHasBeenModified();
}
  
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void DetectorConstruction::SetSizeYZ(G4double value)
{
  fAbsorSizeYZ = value; 
  fWorldSizeYZ = 1.2*fAbsorSizeYZ;
  G4RunManager::GetRunManager()->GeometryHasBeenModified();
}  

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void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (pttoMaterial) {
    fAbsorMaterial = pttoMaterial;
    if(fLAbsor) {
      fLAbsor->SetMaterial(fAbsorMaterial);
      G4RunManager::GetRunManager()->PhysicsHasBeenModified();
    }
  }
}

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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::SetTallyNumber(G4int value)
{
  fTallyNumber = value;
}

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void DetectorConstruction::SetTallySize(G4int j, G4ThreeVector value)
{
  fTallySize[j] = value;
  G4RunManager::GetRunManager()->GeometryHasBeenModified();
}  

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void DetectorConstruction::SetTallyMaterial(G4int j, G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial =
    G4NistManager::Instance()->FindOrBuildMaterial(materialChoice);
  if (pttoMaterial) {
    fTallyMaterial[j] = pttoMaterial;
    if(fLTally[j]) {
      fLTally[j]->SetMaterial(fTallyMaterial[j]);
      G4RunManager::GetRunManager()->PhysicsHasBeenModified();
    }
  }
}

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void DetectorConstruction::SetTallyPosition(G4int j, G4ThreeVector value)
{

  fTallyPosition[j] = value; 
  G4RunManager::GetRunManager()->GeometryHasBeenModified();
}  

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

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