DetectorConstruction.cc

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//
// This example is provided by the Geant4-DNA collaboration
// Any report or published results obtained using the Geant4-DNA software 
// shall cite the following Geant4-DNA collaboration publications:
// Phys. Med. 31 (2015) 861-874
// Med. Phys. 37 (2010) 4692-4708
// The Geant4-DNA web site is available at http://geant4-dna.org
//
 
#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"
#include "TrackerSD.hh"

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

#include "G4Box.hh"
#include "G4PVPlacement.hh"

#include "G4GeometryTolerance.hh"
#include "G4GeometryManager.hh"

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

#include "G4SDManager.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),
fDetectorMessenger(0)
{
  // Default tracking cut
  fpTrackingCut = 11.*eV; 
    
  // Default maximum step size
  fpMaxStepSize = DBL_MAX; 
    
  // 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()
{
  // Define materials
  DefineMaterials();

  // Define volumes
  return DefineVolumes();
}

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void DetectorConstruction::DefineMaterials()
{
  // Water is defined from NIST material database
  G4NistManager * man = G4NistManager::Instance();

  G4Material * H2O = man->FindOrBuildMaterial("G4_WATER");
  
  fpWaterMaterial = H2O;

  // Print materials
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::DefineVolumes()
{
  G4double worldLength = 10*m;

  // World

  G4GeometryManager::GetInstance()->SetWorldMaximumExtent(worldLength);

  G4cout << "Computed tolerance = "
         << G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()/nm
         << " nm" << G4endl;

  G4Box* worldS
    = new G4Box("world",                                    //its name
                worldLength/2,worldLength/2,worldLength/2); //its size
  
  G4LogicalVolume* worldLV
    = new G4LogicalVolume(
                 worldS,   //its solid
                 fpWaterMaterial,      //its material
                 "World_LV"); //its name
  
  G4VPhysicalVolume* worldPV
    = new G4PVPlacement(
                 0,               // no rotation
                 G4ThreeVector(), // at (0,0,0)
                 worldLV,         // its logical volume
                 "World",         // its name
                 0,               // its mother  volume
                 false,           // no boolean operations
                 0,               // copy number
                 false); // checking overlaps 
  
  worldLV->SetUserLimits(new G4UserLimits(fpMaxStepSize,DBL_MAX,DBL_MAX,
                             fpTrackingCut));    

  PrintParameters();
  
  return worldPV;
}

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void DetectorConstruction::ConstructSDandField()
{
  // Sensitive detectors

  G4String trackerChamberSDname = "TrackerChamberSD";
  
  TrackerSD* aTrackerSD = new TrackerSD(trackerChamberSDname,
                                            "TrackerHitsCollection");
  
  G4SDManager::GetSDMpointer()->AddNewDetector(aTrackerSD);

  // Setting aTrackerSD to all logical volumes with the same name 
  // of "Chamber_LV".
  SetSensitiveDetector("World_LV", aTrackerSD, true);

}  

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void DetectorConstruction::SetTrackingCut(G4double value)
{
  fpTrackingCut = value;
}

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void DetectorConstruction::SetMaxStepSize(G4double value)
{
  fpMaxStepSize = value;
}

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void DetectorConstruction::PrintParameters() const
{
  G4cout << "\n---------------------------------------------------------\n";
  G4cout << "---> The tracking cut is set to " 
         << G4BestUnit(fpTrackingCut,"Energy") << G4endl;
  G4cout << "---> The maximum step size is set to " 
         << G4BestUnit(fpMaxStepSize,"Length") << G4endl;
  G4cout << "\n---------------------------------------------------------\n";
}

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