B3DetectorConstruction.cc

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// $Id$
//

#include "B3DetectorConstruction.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"

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B3DetectorConstruction::B3DetectorConstruction()
: G4VUserDetectorConstruction(),
  fLogicCryst(0),fLogicPatient(0),
  fCheckOverlaps(true)
{
  DefineMaterials();
}

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B3DetectorConstruction::~B3DetectorConstruction()
{ }

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void B3DetectorConstruction::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);  
  
  G4Material* 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* B3DetectorConstruction::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", false);
  G4Material* cryst_mat   = nist->FindOrBuildMaterial("Lu2SiO5");
        
  //     
  // World
  //
  G4double world_sizeXY = 2.4*ring_R2;
  G4double world_sizeZ  = 1.2*detector_dZ;
  
  G4Box* solidWorld =    
    new G4Box("World",                       //its name
       0.5*world_sizeXY, 0.5*world_sizeXY, 0.5*world_sizeZ); //its size
      
  G4LogicalVolume* logicWorld =                         
    new G4LogicalVolume(solidWorld,          //its solid
                        default_mat,         //its material
                        "World");            //its name
                                   
  G4VPhysicalVolume* physWorld = 
    new G4PVPlacement(0,                     //no rotation
                      G4ThreeVector(),       //at (0,0,0)
                      logicWorld,            //its logical volume
                      "World",               //its name
                      0,                     //its mother  volume
                      false,                 //no boolean operation
                      0,                     //copy number
                      fCheckOverlaps);       // checking overlaps 
                 
  //
  // ring
  //
  G4Tubs* solidRing =
    new G4Tubs("Ring", ring_R1, ring_R2, 0.5*cryst_dX, 0., twopi);
      
  G4LogicalVolume* 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;
  G4Box* solidCryst = new G4Box("crystal", dX/2, dY/2, cryst_dZ/2);
                     
  fLogicCryst = 
    new G4LogicalVolume(solidCryst,          //its solid
                        cryst_mat,           //its material
                        "crystal");          //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
                      fLogicCryst,           //its logical volume
                      "crystal",             //its name
                      logicRing,             //its mother  volume
                      false,                 //no boolean operation
                      icrys,                 //copy number
                      fCheckOverlaps);       // checking overlaps 
  }
                                                      
  //
  // full detector
  //
  G4Tubs* solidDetector =
    new G4Tubs("Detector", ring_R1, ring_R2, 0.5*detector_dZ, 0., twopi);
      
  G4LogicalVolume* 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(0,                     //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(0,                       //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", false);
    
  G4Tubs* solidPatient =
    new G4Tubs("Patient", 0., patient_radius, 0.5*patient_dZ, 0., twopi);
      
  fLogicPatient =                         
    new G4LogicalVolume(solidPatient,        //its solid
                        patient_mat,         //its material
                        "Patient");          //its name
               
  //
  // place patient in world
  //                    
  new G4PVPlacement(0,                       //no rotation
                    G4ThreeVector(),         //at (0,0,0)
                    fLogicPatient,           //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::Invisible);
  logicDetector->SetVisAttributes (G4VisAttributes::Invisible);    

  // Print materials
  G4cout << *(G4Material::GetMaterialTable()) << G4endl; 
    
  //
  CreateScorers();
                                                                                
  //
  //always return the physical World
  //
  return physWorld;
}

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void B3DetectorConstruction::CreateScorers()
{
  G4SDManager* SDman = G4SDManager::GetSDMpointer();
  SDman->SetVerboseLevel(2);
  
  // declare crystal as a MultiFunctionalDetector scorer
  //  
  G4MultiFunctionalDetector* cryst = new G4MultiFunctionalDetector("crystal");
  G4VPrimitiveScorer* primitiv1 = new G4PSEnergyDeposit("edep");
  cryst->RegisterPrimitive(primitiv1);
  SDman->AddNewDetector(cryst);
  fLogicCryst->SetSensitiveDetector(cryst);
  
  // declare patient as a MultiFunctionalDetector scorer
  //  
  G4MultiFunctionalDetector* patient = new G4MultiFunctionalDetector("patient");
  G4VPrimitiveScorer* primitiv2 = new G4PSDoseDeposit("dose");
  patient->RegisterPrimitive(primitiv2);
  SDman->AddNewDetector(patient);
  fLogicPatient->SetSensitiveDetector(patient);  
}

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