DetectorConstruction.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id: DetectorConstruction.cc 78723 2014-01-20 10:32:17Z gcosmo $
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#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"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4VPhysicalVolume* DetectorConstruction::Construct()
{
  return ConstructVolumes();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void DetectorConstruction::DefineMaterials()
{ 
  G4NistManager* man = G4NistManager::Instance();
  
  man->FindOrBuildMaterial("G4_WATER");
  
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
  
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;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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";
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

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

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void DetectorConstruction::SetMaterial(G4String materialChoice)
{
  // search the material by its name   
  G4Material* pttoMaterial = G4Material::GetMaterial(materialChoice);     
  if (pttoMaterial) fAbsorMaterial = pttoMaterial;
  G4RunManager::GetRunManager()->PhysicsHasBeenModified();  
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......