DetectorConstruction.cc

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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 "G4GeometryManager.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4SolidStore.hh"
#include "G4RunManager.hh"

#include "G4UnitsTable.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4UserLimits.hh"

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DetectorConstruction::DetectorConstruction()
 : G4VUserDetectorConstruction(),
   fAbsorMaterial(0),
   fAbsor(0),
   fDetectorMessenger(0)
{
  //default tracking cut  
  fTrackingCut = 7.4*eV;
  
  // default parameter values
  fAbsorRadius = 1*m;
  
  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();
  
  man->FindOrBuildMaterial("G4_WATER");
  
}

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

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

  PrintParameters();
    
  fLogicalAbsor->SetUserLimits(new G4UserLimits(DBL_MAX,DBL_MAX,DBL_MAX,
    fTrackingCut));
    
  //
  //always return the root volume
  //  
  return fAbsor;
}

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void DetectorConstruction::PrintParameters() const
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The tracking cut to all particles is set to " 
         << G4BestUnit(fTrackingCut,"Energy") << G4endl;
  G4cout << "---> The Absorber is a sphere of " 
         << G4BestUnit(fAbsorRadius,"Length") << " radius of "
         << fAbsorMaterial->GetName() << " made of"
         << "\n \n" << fAbsorMaterial << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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void DetectorConstruction::SetTrackingCut(G4double value)
{
  fTrackingCut = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();  
}

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void DetectorConstruction::SetRadius(G4double value)
{
  fAbsorRadius = value;
  G4RunManager::GetRunManager()->ReinitializeGeometry();  
}

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