B4DetectorConstruction.cc

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#include "B4DetectorConstruction.hh"

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

#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4GlobalMagFieldMessenger.hh"
#include "G4AutoDelete.hh"

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

#include "G4VisAttributes.hh"
#include "G4Colour.hh"

#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

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G4ThreadLocal 
G4GlobalMagFieldMessenger* B4DetectorConstruction::fMagFieldMessenger = nullptr; 

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B4DetectorConstruction::B4DetectorConstruction()
 : G4VUserDetectorConstruction(),
   fAbsorberPV(nullptr),
   fGapPV(nullptr),
   fCheckOverlaps(true)
{
}

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B4DetectorConstruction::~B4DetectorConstruction()
{ 
}

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G4VPhysicalVolume* B4DetectorConstruction::Construct()
{
  // Define materials 
  DefineMaterials();
  
  // Define volumes
  return DefineVolumes();
}

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void B4DetectorConstruction::DefineMaterials()
{ 
  // Lead material defined using NIST Manager
  auto nistManager = G4NistManager::Instance();
  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
  new G4Material("Galactic", z=1., a=1.01*g/mole,density= universe_mean_density,
                  kStateGas, 2.73*kelvin, 3.e-18*pascal);

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

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G4VPhysicalVolume* B4DetectorConstruction::DefineVolumes()
{
  // Geometry parameters
  G4int nofLayers = 10;
  G4double absoThickness = 10.*mm;
  G4double gapThickness =  5.*mm;
  G4double calorSizeXY  = 10.*cm;

  auto layerThickness = absoThickness + gapThickness;
  auto calorThickness = nofLayers * layerThickness;
  auto worldSizeXY = 1.2 * calorSizeXY;
  auto worldSizeZ  = 1.2 * calorThickness; 
  
  // Get materials
  auto defaultMaterial = G4Material::GetMaterial("Galactic");
  auto absorberMaterial = G4Material::GetMaterial("G4_Pb");
  auto gapMaterial = G4Material::GetMaterial("liquidArgon");
  
  if ( ! defaultMaterial || ! absorberMaterial || ! gapMaterial ) {
    G4ExceptionDescription msg;
    msg << "Cannot retrieve materials already defined."; 
    G4Exception("B4DetectorConstruction::DefineVolumes()",
      "MyCode0001", FatalException, msg);
  }  
   
  //     
  // World
  //
  auto worldS 
    = new G4Box("World",           // its name
                 worldSizeXY/2, worldSizeXY/2, worldSizeZ/2); // its size
                         
  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
                 fCheckOverlaps);  // checking overlaps 
  
  //                               
  // Calorimeter
  //  
  auto calorimeterS
    = new G4Box("Calorimeter",     // its name
                 calorSizeXY/2, calorSizeXY/2, calorThickness/2); // its size
                         
  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
                 fCheckOverlaps);  // 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
                                   
  fAbsorberPV
    = 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
                 fCheckOverlaps);  // 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
                                   
  fGapPV
    = 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
                 fCheckOverlaps);  // checking overlaps 
  
  //
  // print parameters
  //
  G4cout
    << G4endl 
    << "------------------------------------------------------------" << G4endl
    << "---> The calorimeter is " << nofLayers << " layers of: [ "
    << absoThickness/mm << "mm of " << absorberMaterial->GetName() 
    << " + "
    << gapThickness/mm << "mm of " << gapMaterial->GetName() << " ] " << G4endl
    << "------------------------------------------------------------" << G4endl;
  
  //                                        
  // Visualization attributes
  //
  worldLV->SetVisAttributes (G4VisAttributes::GetInvisible());

  auto simpleBoxVisAtt= new G4VisAttributes(G4Colour(1.0,1.0,1.0));
  simpleBoxVisAtt->SetVisibility(true);
  calorLV->SetVisAttributes(simpleBoxVisAtt);

  //
  // Always return the physical World
  //
  return worldPV;
}

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void B4DetectorConstruction::ConstructSDandField()
{ 
  // Create global magnetic field messenger.
  // Uniform magnetic field is then created automatically if
  // the field value is not zero.
  G4ThreeVector fieldValue;
  fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
  fMagFieldMessenger->SetVerboseLevel(1);
  
  // Register the field messenger for deleting
  G4AutoDelete::Register(fMagFieldMessenger);
}

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