DetectorConstruction.cc

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#include "DetectorConstruction.hh"
#include "DetectorMessenger.hh"
#include "G4NistManager.hh" 
#include "G4RunManager.hh" 

#include "G4Material.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4UniformMagField.hh"
#include "G4UserLimits.hh"

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

#include "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"

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DetectorConstruction::DetectorConstruction()
:G4VUserDetectorConstruction(),
 fP_Box(0), fL_Box(0), fBoxSize(500*m), fMaterial(0), fMagField(0),
 fUserLimits(0), fDetectorMessenger(0)
{
  DefineMaterials();
  SetMaterial("Iron");
  
  // create UserLimits
  fUserLimits = new G4UserLimits();

  // create commands for interactive definition of the detector  
  fDetectorMessenger = new DetectorMessenger(this);
}

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DetectorConstruction::~DetectorConstruction()
{ delete fDetectorMessenger;}

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

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void DetectorConstruction::DefineMaterials()
{  
 G4double a, z, density; 

 new G4Material("Beryllium", z= 4., a= 9.012182*g/mole, density= 1.848*g/cm3);
 new G4Material("Carbon",    z= 6., a= 12.011*g/mole,   density= 2.265*g/cm3);
 new G4Material("Iron",      z=26., a= 55.85*g/mole,    density= 7.870*g/cm3);

 G4cout << *(G4Material::GetMaterialTable()) << G4endl;
}

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G4VPhysicalVolume* DetectorConstruction::ConstructVolumes()
{
  G4GeometryManager::GetInstance()->OpenGeometry();
  G4PhysicalVolumeStore::GetInstance()->Clean();
  G4LogicalVolumeStore::GetInstance()->Clean();
  G4SolidStore::GetInstance()->Clean();
  
  G4Box*
  sBox = new G4Box("Container",                                //its name
                   fBoxSize/2,fBoxSize/2,fBoxSize/2);        //its dimensions
                                                                 
  fL_Box = new G4LogicalVolume(sBox,                        //its shape
                             fMaterial,                        //its material
                             fMaterial->GetName());        //its name
                             
  fL_Box->SetUserLimits(fUserLimits);                             
                                   
  fP_Box = new G4PVPlacement(0,                                //no rotation
                             G4ThreeVector(),                //at (0,0,0)
                           fL_Box,                        //its logical volume
                           fMaterial->GetName(),        //its name
                           0,                           //its mother  volume
                           false,                        //no boolean operation
                           0);                                //copy number
                           
  PrintParameters();
    
  //
  //always return the root volume
  //
  return fP_Box;
}

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void DetectorConstruction::PrintParameters()
{
  G4cout << "\n The Box is " << G4BestUnit(fBoxSize,"Length")
         << " of " << fMaterial->GetName() << G4endl;
}

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void DetectorConstruction::SetMaterial(const G4String& name)
{
  G4cout << "###SetMaterial"  << G4endl;

  // get the pointer to the existing material
  G4Material* mat = G4Material::GetMaterial(name, false);
  
  // create the material by its name
  if(!mat) { mat = G4NistManager::Instance()->FindOrBuildMaterial(name); }
  
  if (mat && mat != fMaterial) {
    G4cout << "### New target material: " << mat->GetName() << G4endl;
    fMaterial = mat;
    if(fL_Box) {
      fL_Box->SetMaterial(mat);
      G4RunManager::GetRunManager()->PhysicsHasBeenModified();
    } 
  }
}
  

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void DetectorConstruction::SetSize(G4double value)
{
  fBoxSize = value;
}  

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#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

void DetectorConstruction::SetMagField(G4double fieldValue)
{
  //apply a global uniform magnetic field along Z axis
  G4FieldManager* fieldMgr 
   = G4TransportationManager::GetTransportationManager()->GetFieldManager();
    
  if (fMagField) delete fMagField;        //delete the existing magn field
  
  if (fieldValue!=0.)                        // create a new one if non nul
    {
      fMagField = new G4UniformMagField(G4ThreeVector(0.,0.,fieldValue)); 
      fieldMgr->SetDetectorField(fMagField);
      fieldMgr->CreateChordFinder(fMagField);
    }
   else
    {
      fMagField = 0;
      fieldMgr->SetDetectorField(fMagField);
    }
}

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void DetectorConstruction::SetMaxStepSize(G4double val)
{
  // set the maximum allowed step size
  //
  if (val <= DBL_MIN)
    { G4cout << "\n --->warning from SetMaxStepSize: maxStep " 
             << val  << " out of range. Command refused" << G4endl;
      return;
    }       
  fUserLimits->SetMaxAllowedStep(val);
}  

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#include "G4RunManager.hh" 
 
void DetectorConstruction::UpdateGeometry()
{
  G4RunManager::GetRunManager()->DefineWorldVolume(ConstructVolumes());
}

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