DetectorConstruction.cc

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// -------------------------------------------------------------------
// $Id: DetectorConstruction.cc,v 1.1 2012-09-20 mraine Exp $
// -------------------------------------------------------------------

#include "DetectorConstruction.hh"
#include "G4SystemOfUnits.hh"
#include "G4Region.hh"
#include "G4ProductionCuts.hh"

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DetectorConstruction::DetectorConstruction()
:fPhysiWorld(NULL), fLogicWorld(NULL), fSolidWorld(NULL)
{}  

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DetectorConstruction::~DetectorConstruction()
{}

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G4VPhysicalVolume* DetectorConstruction::Construct()

{
  DefineMaterials();
  return ConstructDetector();
}

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void DetectorConstruction::DefineMaterials()
{ 

  // Silicon is defined from NIST material database
  G4NistManager * man = G4NistManager::Instance();
  G4Material * Si = man->FindOrBuildMaterial("G4_Si");

  // Default materials in setup.
  fSiMaterial = Si;
  
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

  // WORLD VOLUME
  
  fWorldSizeX  = 1*um; 
  fWorldSizeY  = 1*um; 
  fWorldSizeZ  = 1*um;

  fSolidWorld = new G4Box("World",                   //its name
               fWorldSizeX/2,fWorldSizeY/2,fWorldSizeZ/2);  //its size
  

  fLogicWorld = new G4LogicalVolume(fSolidWorld,    //its solid
                   fSiMaterial,     //its material
                   "World");        //its name
  
  fPhysiWorld = new G4PVPlacement(0,            //no rotation
                 G4ThreeVector(),   //at (0,0,0)
                                 "World",       //its name
                                 fLogicWorld,       //its logical volume
                                 0,         //its mother  volume
                                 false,         //no boolean operation
                                 0);            //copy number

  G4double TargetSizeZ =  0.2*um; 

  G4Box* targetSolid = new G4Box("Target",                   //its name
                 fWorldSizeX/2,fWorldSizeY/2,TargetSizeZ/2);   //its size
  

  G4LogicalVolume* logicTarget = new G4LogicalVolume(targetSolid,       //its solid
                             fSiMaterial,   //its material
                             "Target");     //its name
  
  new G4PVPlacement(0,                                         //no rotation
            G4ThreeVector(),                                   //at (0,0,0)
            "Target",       //its name
            logicTarget,    //its logical volume
            fPhysiWorld,        //its mother  volume
            false,      //no boolean operation
            0);         //copy number

  // Visualization attributes
  G4VisAttributes* worldVisAtt= new G4VisAttributes(G4Colour(1.0,1.0,1.0)); //White
  worldVisAtt->SetVisibility(true);
  fLogicWorld->SetVisAttributes(worldVisAtt);

  G4VisAttributes* worldVisAtt1 = new G4VisAttributes(G4Colour(1.0,0.0,0.0)); 
  worldVisAtt1->SetVisibility(true);
  logicTarget->SetVisAttributes(worldVisAtt1);

  // Create Target G4Region and add logical volume
  
  fRegion = new G4Region("Target");
  
  G4ProductionCuts* cuts = new G4ProductionCuts();
  
  G4double defCut = 1*nanometer;
  cuts->SetProductionCut(defCut,"gamma");
  cuts->SetProductionCut(defCut,"e-");
  cuts->SetProductionCut(defCut,"e+");
  cuts->SetProductionCut(defCut,"proton");
  
  fRegion->SetProductionCuts(cuts);
  fRegion->AddRootLogicalVolume(logicTarget); 

  return fPhysiWorld;
}