GeometryConstruction.cc

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#include "GeometryConstruction.hh"

#include "G4Material.hh"
#include "G4Element.hh"
#include "G4Box.hh"
#include "G4Sphere.hh"
#include "G4LogicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4PVPlacement.hh"
#include "G4VisAttributes.hh"
#include "G4Colour.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"


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GeometryConstruction::GeometryConstruction()
: G4VUserDetectorConstruction(),
  fUniverse_phys(0),
  fAl_phys(0),
  fSphere_phys(0)
{;}

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GeometryConstruction::~GeometryConstruction()
{;}

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G4VPhysicalVolume* GeometryConstruction::Construct()
{
  //
  //
  // Define materials.
  //
  G4double a, z, density,pressure, temperature;
  G4String name, symbol;

 
  density     = universe_mean_density;    //from PhysicalConstants.h
  pressure    = 3.e-18*pascal;
  temperature = 2.73*kelvin;
  G4Material* Vacuum   = new G4Material("Vacuum",
                                        1., 1.01*g/mole, density,
                                        kStateGas,temperature,pressure);    
  a = 26.98154*g/mole;
  density = 2.70*g/cm3;
  G4Material* Aluminium = new G4Material(name="aluminium", z=13., a, density);

  a = 28.0855*g/mole;
  G4Element* elSi = new G4Element(name="silicon", symbol="Si", z=14., a);

  a = 16.00*g/mole;
  G4Element* elO = new G4Element(name="Oxygen", symbol="O", z=8., a);

  density = 2.65*g/cm3;
  G4Material* SiliconDioxide =
    new G4Material(name="silicon oxide", density, 2);
  SiliconDioxide->AddElement(elSi, 1);
  SiliconDioxide->AddElement(elO,  2);
  //
  // Define size of world and volumes in it.
  //
  G4double world_r = 18*cm;

  G4double box_x = 10*cm;
  G4double box_y = 10*cm;
  G4double box_z = 10*cm;

  G4double sphere_r = 5*cm;

  // Define bodies, logical volumes and physical volumes.
  // First define the experimental hall.
  //
  G4Sphere * universe_s 
    = new G4Sphere("universe_s", 0, world_r, 0, twopi, 0, pi);
  G4LogicalVolume * universe_log
    = new G4LogicalVolume(universe_s,Vacuum,"universe_L",0,0,0);
  //
  fUniverse_phys
    = new G4PVPlacement(0,G4ThreeVector(),"universe_P",
                        universe_log,0,false,0);
                        
  //define an aluminium box
  //
  G4Box * Al_box
    = new G4Box("Al_b", box_x, box_y, box_z);
  G4LogicalVolume * Al_log
    = new G4LogicalVolume(Al_box,Aluminium,"Box_log",0,0,0);
  //
  fAl_phys
    = new G4PVPlacement(0,G4ThreeVector(0.,0.,0.),"Box_phys",
                        Al_log,fUniverse_phys,false,0);

  // Define an inner sphere.
  //
  G4Sphere * aSphere_sph
    = new G4Sphere("aSphere", 0, sphere_r, 0, twopi, 0, pi);
  G4LogicalVolume * aSphere_log
    = new G4LogicalVolume(aSphere_sph,SiliconDioxide,"Sphere_log",0,0,0);
  //
  fSphere_phys
    = new G4PVPlacement(0,G4ThreeVector(0.,0.,0.),"Sphere_phys",aSphere_log,
                        fAl_phys,false,0);
  
//--------- Visualization attributes -------------------------------
  universe_log->SetVisAttributes(G4VisAttributes::GetInvisible());
  G4VisAttributes* aVisAtt= new G4VisAttributes(G4Colour(0,1.0,1.0));
  Al_log->SetVisAttributes(aVisAtt);
  G4VisAttributes* bVisAtt= new G4VisAttributes(G4Colour(1.0,2.0,.0));
  aSphere_log->SetVisAttributes(bVisAtt);

  return fUniverse_phys;
}

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