MoviesDetectorConstruction.cc

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/// \file MoviesDetectorConstruction.cc
/// \brief Implementation of the MoviesDetectorConstruction class
// 
 
#include "MoviesDetectorConstruction.hh"
 
#include "G4Material.hh"
#include "G4NistManager.hh"
 
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
 
#include "G4VisAttributes.hh"
 
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
 
G4VPhysicalVolume* MoviesDetectorConstruction::Construct()
{
  // Define materials 
  DefineMaterials();
  
  // Define volumes
  return DefineVolumes();
}
 
void MoviesDetectorConstruction::DefineMaterials()
{ 
  auto nistManager = G4NistManager::Instance();
 
  // Lead material defined using NIST Manager
  nistManager->FindOrBuildMaterial("G4_Pb");
 
  // Liquid argon material
  G4double a;  // mass of a mole;
  G4double z;  // z=mean number of protons;  
  G4double density; 
  new G4Material("liquidArgon", z=18., a=39.95*g/mole, density=1.390*g/cm3);
         // The argon by NIST Manager is a gas with a different density
 
  // Vacuum
  nistManager->FindOrBuildMaterial("G4_Galactic");
 
  // Print materials
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}
 
G4VPhysicalVolume* MoviesDetectorConstruction::DefineVolumes()
{
  // Geometry parameters
  const G4bool checkOverlaps = true;
 
  // A generous world
  const G4double worldSizeXY = 1.*m;
  const G4double worldSizeZ  = 1.*m;
 
  // Lead-argon calorimeter
  G4int nofLayers = 10;
  G4double absoThickness = 10.*mm;
  G4double gapThickness =  5.*mm;
  G4double calorSizeXY  = 10.*cm;
 
  auto layerThickness = absoThickness + gapThickness;
  auto calorThickness = nofLayers * layerThickness;
 
  // Get materials
  auto defaultMaterial = G4Material::GetMaterial("G4_Galactic");
  auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
  auto gapMaterial = G4Material::GetMaterial("liquidArgon");
 
  // World
  auto worldS
    = new G4Box("World",worldSizeXY/2,worldSizeXY/2,worldSizeZ/2);
                         
  auto worldLV
    = new G4LogicalVolume(
                 worldS,           // its solid
                 defaultMaterial,  // its material
                 "World");         // its name
                                   
  auto 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 operation
                 0,                // copy number
                 checkOverlaps);  // checking overlaps
  
 
  // Calorimeter
 
  auto calorimeterS
    = new G4Box("Calorimeter",calorSizeXY/2,calorSizeXY/2,calorThickness/2);
                         
  auto calorLV
    = new G4LogicalVolume(
                 calorimeterS,     // its solid
                 defaultMaterial,  // its material
                 "Calorimeter");   // its name
                                   
  new G4PVPlacement(
                 0,                // no rotation
                 G4ThreeVector(),  // at (0,0,0)
                 calorLV,          // its logical volume                         
                 "Calorimeter",    // its name
                 worldLV,          // its mother  volume
                 false,            // no boolean operation
                 0,                // copy number
                 checkOverlaps);  // checking overlaps
  
  // Layer
 
  auto layerS 
    = new G4Box("Layer",           // its name
                 calorSizeXY/2, calorSizeXY/2, layerThickness/2); // its size
                         
  auto layerLV
    = new G4LogicalVolume(
                 layerS,           // its solid
                 defaultMaterial,  // its material
                 "Layer");         // its name
 
  new G4PVReplica(
                 "Layer",          // its name
                 layerLV,          // its logical volume
                 calorLV,          // its mother
                 kZAxis,           // axis of replication
                 nofLayers,        // number of replica
                 layerThickness);  // witdth of replica
  
  // Absorber
 
  auto absorberS 
    = new G4Box("Abso",            // its name
                 calorSizeXY/2, calorSizeXY/2, absoThickness/2); // its size
                         
  auto absorberLV
    = new G4LogicalVolume(
                 absorberS,        // its solid
                 absorberMaterial, // its material
                 "Abso");          // its name
                                   
  new G4PVPlacement(
                 0,                // no rotation
                 G4ThreeVector(0., 0., -gapThickness/2), // its position
                 absorberLV,       // its logical volume                         
                 "Abso",           // its name
                 layerLV,          // its mother  volume
                 false,            // no boolean operation
                 0,                // copy number
                 checkOverlaps);  // checking overlaps
 
  // Gap
 
  auto gapS
    = new G4Box("Gap",             // its name
                 calorSizeXY/2, calorSizeXY/2, gapThickness/2); // its size
                         
  auto gapLV
    = new G4LogicalVolume(
                 gapS,             // its solid
                 gapMaterial,      // its material
                 "Gap");           // its name
                                   
  new G4PVPlacement(
                 0,                // no rotation
                 G4ThreeVector(0., 0., absoThickness/2), // its position
                 gapLV,            // its logical volume                         
                 "Gap",            // its name
                 layerLV,          // its mother  volume
                 false,            // no boolean operation
                 0,                // copy number
                 checkOverlaps);  // checking overlaps
  
  // Visualization attributes
  worldLV->SetVisAttributes (G4VisAttributes::GetInvisible());
 
  return worldPV;
}