examples/advanced/microelectronics/src/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;
  
}

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G4VPhysicalVolume* DetectorConstruction::ConstructDetector()
{

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  // 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;
}