B4DetectorConstruction.cxx

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// $Id: B4DetectorConstruction.cc 77601 2013-11-26 17:08:44Z gcosmo $
//
/// \file B4DetectorConstruction.cxx
/// \brief Implementation of the B4DetectorConstruction class
 
#include "B4DetectorConstruction.hh"
 
// Added for VMC
#include "TG4GeometryManager.h"
 
#include "G4Material.hh"
#include "G4NistManager.hh"
 
#include "G4AutoDelete.hh"
#include "G4Box.hh"
#include "G4GlobalMagFieldMessenger.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
 
#include "G4GeometryManager.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4SolidStore.hh"
 
#include "G4Colour.hh"
#include "G4VisAttributes.hh"
 
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
 
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G4ThreadLocal G4GlobalMagFieldMessenger*
  B4DetectorConstruction::fMagFieldMessenger = 0;
 
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B4DetectorConstruction::B4DetectorConstruction()
  : G4VUserDetectorConstruction(),
    fAbsorberPV(0),
    fGapPV(0),
    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
  G4NistManager* 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;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4VPhysicalVolume* B4DetectorConstruction::DefineVolumes()
{
  // Geometry parameters
  G4int nofLayers = 10;
  G4double absoThickness = 10. * mm;
  G4double gapThickness = 5. * mm;
  G4double calorSizeXY = 10. * cm;
 
  G4double layerThickness = absoThickness + gapThickness;
  G4double calorThickness = nofLayers * layerThickness;
  G4double worldSizeXY = 1.2 * calorSizeXY;
  G4double worldSizeZ = 1.2 * calorThickness;
 
  // Get materials
  G4Material* defaultMaterial = G4Material::GetMaterial("Galactic");
  G4Material* absorberMaterial = G4Material::GetMaterial("G4_Pb");
  G4Material* gapMaterial = G4Material::GetMaterial("liquidArgon");
 
  if (!defaultMaterial || !absorberMaterial || !gapMaterial) {
    G4ExceptionDescription msg;
    msg << "Cannot retrieve materials already defined.";
    G4Exception("B4DetectorConstruction::DefineVolumes()", "MyCode0001",
      FatalException, msg);
  }
 
  //
  // World
  //
  G4VSolid* worldS = new G4Box("World",                // its name
    worldSizeXY / 2, worldSizeXY / 2, worldSizeZ / 2); // its size
 
  G4LogicalVolume* worldLV = new G4LogicalVolume(worldS, // its solid
    defaultMaterial,                                     // its material
    "WRLD");                                             // its name
 
  G4VPhysicalVolume* worldPV = new G4PVPlacement(0, // no rotation
    G4ThreeVector(),                                // at (0,0,0)
    worldLV,                                        // its logical volume
    "WRLD",                                         // its name
    0,                                              // its mother  volume
    false,                                          // no boolean operation
    0,                                              // copy number
    fCheckOverlaps);                                // checking overlaps
 
  //
  // Calorimeter
  //
  G4VSolid* calorimeterS = new G4Box("Calorimeter",        // its name
    calorSizeXY / 2, calorSizeXY / 2, calorThickness / 2); // its size
 
  G4LogicalVolume* calorLV = new G4LogicalVolume(calorimeterS, // its solid
    defaultMaterial,                                           // its material
    "CALO");                                                   // its name
 
  new G4PVPlacement(0, // no rotation
    G4ThreeVector(),   // at (0,0,0)
    calorLV,           // its logical volume
    "CALO",            // its name
    worldLV,           // its mother  volume
    false,             // no boolean operation
    0,                 // copy number
    fCheckOverlaps);   // checking overlaps
 
  //
  // Layer
  //
  G4VSolid* layerS = new G4Box("Layer",                    // its name
    calorSizeXY / 2, calorSizeXY / 2, layerThickness / 2); // its size
 
  G4LogicalVolume* layerLV = new G4LogicalVolume(layerS, // its solid
    defaultMaterial,                                     // its material
    "LAYE");                                             // its name
 
  new G4PVReplica("LAYE", // its name
    layerLV,              // its logical volume
    calorLV,              // its mother
    kZAxis,               // axis of replication
    nofLayers,            // number of replica
    layerThickness);      // witdth of replica
 
  //
  // Absorber
  //
  G4VSolid* absorberS = new G4Box("Abso",                 // its name
    calorSizeXY / 2, calorSizeXY / 2, absoThickness / 2); // its size
 
  G4LogicalVolume* 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
  //
  G4VSolid* gapS = new G4Box("Gap",                      // its name
    calorSizeXY / 2, calorSizeXY / 2, gapThickness / 2); // its size
 
  G4LogicalVolume* gapLV = new G4LogicalVolume(gapS, // its solid
    gapMaterial,                                     // its material
    "GAPX");                                         // its name
 
  fGapPV = new G4PVPlacement(0,               // no rotation
    G4ThreeVector(0., 0., absoThickness / 2), // its position
    gapLV,                                    // its logical volume
    "GAPX",                                   // its name
    layerLV,                                  // its mother  volume
    false,                                    // no boolean operation
    0,                                        // copy number
    fCheckOverlaps);                          // checking overlaps
 
  //
  // print parameters
  //
  G4cout << "\n------------------------------------------------------------"
         << "\n---> The calorimeter is " << nofLayers << " layers of: [ "
         << absoThickness / mm << "mm of " << absorberMaterial->GetName()
         << " + " << gapThickness / mm << "mm of " << gapMaterial->GetName()
         << " ] "
         << "\n------------------------------------------------------------\n";
 
  //
  // Visualization attributes
  //
  worldLV->SetVisAttributes(G4VisAttributes::GetInvisible());
 
  G4VisAttributes* simpleBoxVisAtt =
    new G4VisAttributes(G4Colour(1.0, 1.0, 1.0));
  simpleBoxVisAtt->SetVisibility(true);
  calorLV->SetVisAttributes(simpleBoxVisAtt);
 
  //
  // Always return the physical World
  //
  return worldPV;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void B4DetectorConstruction::ConstructSDandField()
{
  // Added for VMC
  TG4GeometryManager::Instance()->ConstructSDandField();
  /*
    // Create global magnetic field messenger.
    // Uniform magnetic field is then created automatically if
    // the field value is not zero.
    G4ThreeVector fieldValue = G4ThreeVector();
    fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
    fMagFieldMessenger->SetVerboseLevel(1);
 
    // Register the field messenger for deleting
    G4AutoDelete::Register(fMagFieldMessenger);
  */
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......