examples/advanced/amsEcal/src/DetectorConstruction.cc

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// $Id: DetectorConstruction.cc 101905 2016-12-07 11:34:39Z gunter $
//
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#include "DetectorConstruction.hh"

#include "G4SystemOfUnits.hh"
#include "G4PhysicalConstants.hh"
#include "G4Material.hh"
#include "G4Tubs.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4PVReplica.hh"
#include "G4Transform3D.hh"
#include "G4RotationMatrix.hh"

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

#include "G4VisAttributes.hh"


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DetectorConstruction::DetectorConstruction()
:fiberMat(0),lvol_fiber(0), absorberMat(0),lvol_layer(0),
 moduleMat(0),lvol_module(0), calorimeterMat(0),lvol_calorimeter(0),
 worldMat(0),pvol_world(0), defaultMat(0)
{
  // materials
  DefineMaterials();
  
  // default parameter values of calorimeter
  //
  fiberDiameter       = 1.13*mm;  //1.08*mm
  nbOfFibers          = 490;    //490
  distanceInterFibers = 1.35*mm;  //1.35*mm
  layerThickness      = 1.73*mm;  //1.68*mm  
  milledLayer         = 1.00*mm;    //1.40*mm ?
  nbOfLayers          = 10;       //10
  nbOfModules         = 9;        //9
     
  fiberLength         = (nbOfFibers+0.5)*distanceInterFibers; //662.175*mm
}

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DetectorConstruction::~DetectorConstruction()
{ }

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G4VPhysicalVolume* DetectorConstruction::Construct()
{
  return ConstructCalorimeter();
}

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void DetectorConstruction::DefineMaterials()
{
  // define Elements
  //
  G4Element* H  = new G4Element("Hydrogen","H", 1,  1.01*g/mole);
  G4Element* C  = new G4Element("Carbon",  "C", 6, 12.01*g/mole);
  G4Element* N  = new G4Element("Nitrogen","N", 7, 14.01*g/mole);
  G4Element* O  = new G4Element("Oxygen",  "O", 8, 16.00*g/mole);

  G4int natoms, ncomponents;
  G4double density, massfraction;            

  // Lead
  //
  G4Material* Pb =   
  new G4Material("Lead", 82., 207.20*g/mole, density= 0.98*11.20*g/cm3);

  // Scintillator
  //
  G4Material* Sci = 
  new G4Material("Scintillator", density= 1.032*g/cm3, ncomponents=2);
  Sci->AddElement(C, natoms=8);
  Sci->AddElement(H, natoms=8);
  
  Sci->GetIonisation()->SetBirksConstant(0.126*mm/MeV);

  // Air
  //
  G4Material* Air = 
  new G4Material("Air", density= 1.290*mg/cm3, ncomponents=2);
  Air->AddElement(N, massfraction=70*perCent);
  Air->AddElement(O, massfraction=30.*perCent);

  // example of vacuum
  //
  density     = universe_mean_density;    //from PhysicalConstants.h
  G4double pressure    = 3.e-18*pascal;
  G4double temperature = 2.73*kelvin;
  G4Material* Vacuum =   
  new G4Material("Galactic", 1., 1.008*g/mole, density,
                             kStateGas,temperature,pressure);

  //attribute materials
  //
  defaultMat     = Vacuum;  
  fiberMat       = Sci;
  absorberMat    = Pb;
  moduleMat      = defaultMat;
  calorimeterMat = defaultMat;
  worldMat       = defaultMat;

  // print table
  //      
  G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructCalorimeter()
{
  // Cleanup old geometry
  //
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
  
  // fibers
  //
  G4Tubs*
  svol_fiber = new G4Tubs("fiber",      //name
                         0*mm, 0.5*fiberDiameter, //r1, r2
       0.5*fiberLength,   //half-length 
       0., twopi);      //theta1, theta2
       
  lvol_fiber = new G4LogicalVolume(svol_fiber,    //solid
                                   fiberMat,    //material
                                   "fiber");    //name
           
  // layer
  //
  G4double sizeX = layerThickness;
  G4double sizeY = distanceInterFibers*nbOfFibers;
  G4double sizeZ = fiberLength;
  
  G4Box*      
  svol_layer = new G4Box("layer",     //name
                  0.5*sizeX, 0.5*sizeY, 0.5*sizeZ); //size


  lvol_layer = new G4LogicalVolume(svol_layer,    //solid
                                   absorberMat,   //material
                                   "layer");    //name

  // put fibers within layer
  //
  G4double Xcenter = 0.;
  G4double Ycenter = -0.5*(sizeY + distanceInterFibers);
  
  for (G4int k=0; k<nbOfFibers; k++) {
    Ycenter += distanceInterFibers;
    new G4PVPlacement(0,          //no rotation
            G4ThreeVector(Xcenter,Ycenter,0.),    //position
                      lvol_fiber,             //logical volume  
                      "fiber",          //name
                      lvol_layer,           //mother
                      false,                //no boulean operat
                      k+1);                   //copy number

  }
           
  // modules
  //
  moduleThickness = layerThickness*nbOfLayers + milledLayer;       
  sizeX = moduleThickness;
  sizeY = fiberLength;
  sizeZ = fiberLength;
  
  G4Box*      
  svol_module = new G4Box("module",     //name
                  0.5*sizeX, 0.5*sizeY, 0.5*sizeZ); //size

  lvol_module = new G4LogicalVolume(svol_module,  //solid
                                   absorberMat,   //material
                                   "module");   //name

  // put layers within module
  //
  Xcenter = -0.5*(nbOfLayers+1)*layerThickness;
  Ycenter =  0.25*distanceInterFibers;
  
  for (G4int k=0; k<nbOfLayers; k++) {
    Xcenter += layerThickness;
    Ycenter  = - Ycenter;
    new G4PVPlacement(0,          //no rotation
            G4ThreeVector(Xcenter,Ycenter,0.),    //position
                      lvol_layer,             //logical volume  
                      "layer",          //name
                      lvol_module,            //mother
                      false,                //no boulean operat
                      k+1);                   //copy number

  }                    

  // calorimeter
  //
  calorThickness = moduleThickness*nbOfModules;
  sizeX = calorThickness;
  sizeY = fiberLength;
  sizeZ = fiberLength;
  
  G4Box*      
  svol_calorimeter = new G4Box("calorimeter",   //name
                  0.5*sizeX, 0.5*sizeY, 0.5*sizeZ); //size


  lvol_calorimeter = new G4LogicalVolume(svol_calorimeter,  //solid
                                   calorimeterMat,    //material
                                   "calorimeter");    //name  

  // put modules inside calorimeter
  //  
  Xcenter = -0.5*(calorThickness + moduleThickness);
  

  for (G4int k=0; k<nbOfModules; k++) {
    Xcenter += moduleThickness;     
    G4RotationMatrix rotm;                    //rotation matrix to place modules    
    if ((k+1)%2 == 0) rotm.rotateX(90*deg);
  G4Transform3D transform(rotm, G4ThreeVector(Xcenter,0.,0.));    
    new G4PVPlacement(transform,          //rotation+position
                      lvol_module,          //logical volume  
                      "module",             //name
                      lvol_calorimeter,         //mother
                      false,                //no boulean operat
                      k+1);                   //copy number
  }

  // world
  //
  sizeX = 1.2*calorThickness;
  sizeY = 1.2*fiberLength;
  sizeZ = 1.2*fiberLength;
  
  worldSizeX = sizeX;
  
  G4Box*      
  svol_world = new G4Box("world",     //name
                  0.5*sizeX, 0.5*sizeY, 0.5*sizeZ); //size

  lvol_world = new G4LogicalVolume(svol_world,    //solid
                                   worldMat,    //material
                                   "world");    //name 
            
  pvol_world = new G4PVPlacement(0,     //no rotation
           G4ThreeVector(), //at (0,0,0)
                                 lvol_world,    //logical volume
                                 "world",   //name
                                 0,     //mother  volume
                                 false,     //no boolean operation
                                 0);      //copy number

  //put calorimeter in world
  //  
  new G4PVPlacement(0,        //no rotation
                    G4ThreeVector(),    //at (0,0,0)
                    lvol_calorimeter,   //logical volume
                    "calorimeter",    //name
                    lvol_world,     //mother  volume
                    false,      //no boolean operation
                    0);       //copy number
                 
  PrintCalorParameters();
  
  // Visualization attributes
  //
  lvol_fiber->SetVisAttributes (G4VisAttributes::GetInvisible());  
  lvol_layer->SetVisAttributes (G4VisAttributes::GetInvisible());
  lvol_world->SetVisAttributes (G4VisAttributes::GetInvisible());
    
  //always return the physical World
  //
  return pvol_world;
}

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#include "G4UnitsTable.hh"

void DetectorConstruction::PrintCalorParameters()
{
  G4cout << "\n-------------------------------------------------------------"
     << "\n ---> The calorimeter is " << nbOfModules << " Modules"
     << "\n ---> A Module is " << nbOfLayers << " Layers + 1 milled Layer";
     
  G4cout  
     << "\n ---> A Layer is " << G4BestUnit(layerThickness,"Length")  
     << " thickness of " << absorberMat->GetName();    
     
  G4cout 
     << "\n ---> A Layer includes " << nbOfFibers << " fibers of " 
     << fiberMat->GetName();
     
  G4cout 
     << "\n      ---> diameter : " << G4BestUnit(fiberDiameter,"Length")
     << "\n      ---> length   : " << G4BestUnit(fiberLength,"Length")
     << "\n      ---> distance : " << G4BestUnit(distanceInterFibers,"Length");
     
  G4cout  
     << "\n ---> The milled Layer is " << G4BestUnit(milledLayer,"Length")  
     << " thickness of " << absorberMat->GetName();
     
  G4cout 
   << "\n\n ---> Module thickness " << G4BestUnit(moduleThickness,"Length");
  
  G4cout 
   << "\n\n ---> Total calor thickness " << G4BestUnit(calorThickness,"Length")
   <<   "\n      Tranverse size        " << G4BestUnit(fiberLength,"Length");

  G4cout << "\n-------------------------------------------------------------\n";
  G4cout << G4endl;
}

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#include "G4GlobalMagFieldMessenger.hh"
#include "G4AutoDelete.hh"

void DetectorConstruction::ConstructSDandField()
{
    if ( fFieldMessenger.Get() == 0 ) {
        // Create global magnetic field messenger.
        // Uniform magnetic field is then created automatically if
        // the field value is not zero.
        G4ThreeVector fieldValue = G4ThreeVector();
        G4GlobalMagFieldMessenger* msg =
        new G4GlobalMagFieldMessenger(fieldValue);
        //msg->SetVerboseLevel(1);
        G4AutoDelete::Register(msg);
        fFieldMessenger.Put( msg );
        
    }
}

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