DetectorConstruction.cc

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/// \file B3/B3a/src/DetectorConstruction.cc
/// \brief Implementation of the B3::DetectorConstruction class
 
#include "DetectorConstruction.hh"
 
#include "G4NistManager.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4RotationMatrix.hh"
#include "G4Transform3D.hh"
#include "G4SDManager.hh"
#include "G4MultiFunctionalDetector.hh"
#include "G4VPrimitiveScorer.hh"
#include "G4PSEnergyDeposit.hh"
#include "G4PSDoseDeposit.hh"
#include "G4VisAttributes.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
 
namespace B3
{
 
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DetectorConstruction::DetectorConstruction()
{
  DefineMaterials();
}
 
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void DetectorConstruction::DefineMaterials()
{
  G4NistManager* man = G4NistManager::Instance();
 
  G4bool isotopes = false;
 
  G4Element*  O = man->FindOrBuildElement("O" , isotopes);
  G4Element* Si = man->FindOrBuildElement("Si", isotopes);
  G4Element* Lu = man->FindOrBuildElement("Lu", isotopes);
 
  auto LSO = new G4Material("Lu2SiO5", 7.4 * g / cm3, 3);
  LSO->AddElement(Lu, 2);
  LSO->AddElement(Si, 1);
  LSO->AddElement(O , 5);
}
 
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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  // Gamma detector Parameters
  //
  G4double cryst_dX = 6*cm, cryst_dY = 6*cm, cryst_dZ = 3*cm;
  G4int nb_cryst = 32;
  G4int nb_rings = 9;
  //
  G4double dPhi = twopi/nb_cryst, half_dPhi = 0.5*dPhi;
  G4double cosdPhi = std::cos(half_dPhi);
  G4double tandPhi = std::tan(half_dPhi);
  //
  G4double ring_R1 = 0.5*cryst_dY/tandPhi;
  G4double ring_R2 = (ring_R1+cryst_dZ)/cosdPhi;
  //
  G4double detector_dZ = nb_rings*cryst_dX;
  //
  G4NistManager* nist = G4NistManager::Instance();
  G4Material* default_mat = nist->FindOrBuildMaterial("G4_AIR");
  G4Material* cryst_mat   = nist->FindOrBuildMaterial("Lu2SiO5");
 
  //
  // World
  //
  G4double world_sizeXY = 2.4*ring_R2;
  G4double world_sizeZ  = 1.2*detector_dZ;
 
  auto solidWorld = new G4Box("World",                           // its name
    0.5 * world_sizeXY, 0.5 * world_sizeXY, 0.5 * world_sizeZ);  // its size
 
  auto logicWorld = new G4LogicalVolume(solidWorld,  // its solid
    default_mat,                                     // its material
    "World");                                        // its name
 
  auto physWorld = new G4PVPlacement(nullptr,  // no rotation
    G4ThreeVector(),                           // at (0,0,0)
    logicWorld,                                // its logical volume
    "World",                                   // its name
    nullptr,                                   // its mother  volume
    false,                                     // no boolean operation
    0,                                         // copy number
    fCheckOverlaps);                           // checking overlaps
 
  //
  // ring
  //
  auto solidRing = new G4Tubs("Ring", ring_R1, ring_R2, 0.5 * cryst_dX, 0., twopi);
 
  auto logicRing = new G4LogicalVolume(solidRing,  // its solid
    default_mat,                                   // its material
    "Ring");                                       // its name
 
  //
  // define crystal
  //
  G4double gap = 0.5*mm;        //a gap for wrapping
  G4double dX = cryst_dX - gap, dY = cryst_dY - gap;
  auto solidCryst = new G4Box("crystal", dX / 2, dY / 2, cryst_dZ / 2);
 
  auto logicCryst = new G4LogicalVolume(solidCryst,  // its solid
    cryst_mat,                                       // its material
    "CrystalLV");                                    // its name
 
  // place crystals within a ring
  //
  for (G4int icrys = 0; icrys < nb_cryst ; icrys++) {
    G4double phi = icrys*dPhi;
    G4RotationMatrix rotm  = G4RotationMatrix();
    rotm.rotateY(90*deg);
    rotm.rotateZ(phi);
    G4ThreeVector uz = G4ThreeVector(std::cos(phi),  std::sin(phi),0.);
    G4ThreeVector position = (ring_R1+0.5*cryst_dZ)*uz;
    G4Transform3D transform = G4Transform3D(rotm,position);
 
    new G4PVPlacement(transform,             //rotation,position
                      logicCryst,            //its logical volume
                      "crystal",             //its name
                      logicRing,             //its mother  volume
                      false,                 //no boolean operation
                      icrys,                 //copy number
                      fCheckOverlaps);       // checking overlaps
  }
 
  //
  // full detector
  //
  auto solidDetector = new G4Tubs("Detector", ring_R1, ring_R2, 0.5 * detector_dZ, 0., twopi);
 
  auto logicDetector = new G4LogicalVolume(solidDetector,  // its solid
    default_mat,                                           // its material
    "Detector");                                           // its name
 
  //
  // place rings within detector
  //
  G4double OG = -0.5*(detector_dZ + cryst_dX);
  for (G4int iring = 0; iring < nb_rings ; iring++) {
    OG += cryst_dX;
    new G4PVPlacement(nullptr,  // no rotation
      G4ThreeVector(0, 0, OG),  // position
      logicRing,                // its logical volume
      "ring",                   // its name
      logicDetector,            // its mother  volume
      false,                    // no boolean operation
      iring,                    // copy number
      fCheckOverlaps);          // checking overlaps
  }
 
  //
  // place detector in world
  //
  new G4PVPlacement(nullptr,  // no rotation
    G4ThreeVector(),          // at (0,0,0)
    logicDetector,            // its logical volume
    "Detector",               // its name
    logicWorld,               // its mother  volume
    false,                    // no boolean operation
    0,                        // copy number
    fCheckOverlaps);          // checking overlaps
 
  //
  // patient
  //
  G4double patient_radius = 8*cm;
  G4double patient_dZ = 10*cm;
  G4Material* patient_mat = nist->FindOrBuildMaterial("G4_BRAIN_ICRP");
 
  auto solidPatient = new G4Tubs("Patient", 0., patient_radius, 0.5 * patient_dZ, 0., twopi);
 
  auto logicPatient = new G4LogicalVolume(solidPatient,  // its solid
    patient_mat,                                         // its material
    "PatientLV");                                        // its name
 
  //
  // place patient in world
  //
  new G4PVPlacement(nullptr,  // no rotation
    G4ThreeVector(),          // at (0,0,0)
    logicPatient,             // its logical volume
    "Patient",                // its name
    logicWorld,               // its mother  volume
    false,                    // no boolean operation
    0,                        // copy number
    fCheckOverlaps);          // checking overlaps
 
  // Visualization attributes
  //
  logicRing->SetVisAttributes (G4VisAttributes::GetInvisible());
  logicDetector->SetVisAttributes (G4VisAttributes::GetInvisible());
 
  // Print materials
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
 
  //always return the physical World
  //
  return physWorld;
}
 
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void DetectorConstruction::ConstructSDandField()
{
  G4SDManager::GetSDMpointer()->SetVerboseLevel(1);
 
  // declare crystal as a MultiFunctionalDetector scorer
  //
  auto cryst = new G4MultiFunctionalDetector("crystal");
  G4SDManager::GetSDMpointer()->AddNewDetector(cryst);
  G4VPrimitiveScorer* primitiv1 = new G4PSEnergyDeposit("edep");
  cryst->RegisterPrimitive(primitiv1);
  SetSensitiveDetector("CrystalLV",cryst);
 
  // declare patient as a MultiFunctionalDetector scorer
  //
  auto patient = new G4MultiFunctionalDetector("patient");
  G4SDManager::GetSDMpointer()->AddNewDetector(patient);
  G4VPrimitiveScorer* primitiv2 = new G4PSDoseDeposit("dose");
  patient->RegisterPrimitive(primitiv2);
  SetSensitiveDetector("PatientLV",patient);
}
 
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}