DetectorSimpleALICE.cc

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// $Id: DetectorSimpleALICE.cc 72517 2013-07-24 23:01:29Z gum $
//
//

#include "DetectorSimpleALICE.hh"
#include "SensitiveDetector.hh"
#include "Materials.hh"

#include "G4Material.hh"
#include "G4Box.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4UniformMagField.hh"
#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"
#include "G4SDManager.hh"

#include "G4Region.hh"

#include "G4UnitsTable.hh"
#include "G4SystemOfUnits.hh"
#include "G4ios.hh"

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DetectorSimpleALICE::DetectorSimpleALICE()
  : fRadiatorDescription(0) 
{}

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DetectorSimpleALICE::~DetectorSimpleALICE()
{
  // delete fRadiatorDescription;
        // the description is deleted in detector construction
}

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G4VPhysicalVolume* DetectorSimpleALICE::Construct()
{
  // Geometry parameters
  //

  G4cout << "DetectorSimpleALICE setup" << G4endl;

  G4double worldSizeZ = 400.*cm;
  G4double worldSizeR = 20.*cm;

  // Radiator and detector parameters

  G4double radThickness = 0.020*mm;
  G4double gasGap       = 0.250*mm;  
  G4double foilGasRatio = radThickness/(radThickness+gasGap);
  G4int foilNumber      = 220;

  G4double absorberThickness = 38.3*mm;
  G4double absorberRadius    = 100.*mm;

  G4double windowThick    = 51.0*micrometer;
  G4double electrodeThick = 10.0*micrometer;
  G4double gapThick       = 10.0*cm;
  G4double detGap         = 0.01*mm;

  G4double startZ       = 100.0*mm;

  // Materials
  //

  // Change to create materials using NIST
  G4Material* air   = Materials::GetInstance()->GetMaterial("Air");
  G4Material* mylar = Materials::GetInstance()->GetMaterial("Mylar");
  G4Material* xe15CO2 = Materials::GetInstance()->GetMaterial("Xe15CO2");

  G4double foilDensity = mylar->GetDensity();
  G4double gasDensity  = air->GetDensity();  
  G4double totDensity  = foilDensity*foilGasRatio 
                       + gasDensity*(1.0-foilGasRatio);

  G4double fractionFoil =  foilDensity*foilGasRatio/totDensity;
  G4double fractionGas  =  gasDensity*(1.0-foilGasRatio)/totDensity;

  G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
  radiatorMat->AddMaterial(mylar, fractionFoil);
  radiatorMat->AddMaterial(air, fractionGas);

  // Radiator description
  fRadiatorDescription = new RadiatorDescription;
  fRadiatorDescription->fFoilMaterial  = mylar; 
  // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
  fRadiatorDescription->fGasMaterial   = air; // CO2; // He; //
  fRadiatorDescription->fFoilThickness = radThickness;
  fRadiatorDescription->fGasThickness  = gasGap;
  fRadiatorDescription->fFoilNumber = foilNumber;

  G4Material* worldMaterial    = air; // CO2;
  G4Material* absorberMaterial = xe15CO2;

  // Volumes
  //
 
  G4VSolid* solidWorld 
    = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ/2.);
 
  G4LogicalVolume* logicWorld 
    = new G4LogicalVolume(solidWorld,  worldMaterial,  "World");

  G4VPhysicalVolume* physicsWorld 
    = new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0,  false, 0);

  // TR radiator envelope

  G4double radThick = foilNumber*(radThickness + gasGap) - gasGap + detGap;
  G4double radZ = startZ + 0.5*radThick;

  G4VSolid* solidRadiator 
    = new G4Box("Radiator", 1.1*absorberRadius, 1.1*absorberRadius, 
                0.5*radThick);

  G4LogicalVolume* logicRadiator 
    = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
 
  new G4PVPlacement(0, G4ThreeVector(0, 0, radZ),
                    "Radiator", logicRadiator, physicsWorld, false, 0 );

  fRadiatorDescription->fLogicalVolume = logicRadiator;

  // create region for window inside windowR for

  G4Region* radRegion = new G4Region("XTRradiator");
  radRegion->AddRootLogicalVolume(logicRadiator);

  // Absorber

  G4VSolid* solidAbsorber 
    = new G4Box("Absorber", absorberRadius, absorberRadius, 
                absorberThickness/2.);

  G4LogicalVolume* logicAbsorber 
    = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");

  G4double windowZ = startZ + radThick + windowThick/2. + 15.0*mm;
  G4double gapZ = windowZ + windowThick/2. + gapThick/2. + 0.01*mm;
  G4double electrodeZ = gapZ + gapThick/2. + electrodeThick/2. + 0.01*mm;
  G4double absorberZ = electrodeZ + electrodeThick/2. 
    + absorberThickness/2. + 0.01*mm;

  new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ),
                    "Absorber", logicAbsorber, physicsWorld, false, 0);

  G4Region* regGasDet = new G4Region("XTRdEdxDetector");
  regGasDet->AddRootLogicalVolume(logicAbsorber);

  // Sensitive Detectors: Absorber

  SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
  G4SDManager::GetSDMpointer()->AddNewDetector(sd );
  logicAbsorber->SetSensitiveDetector(sd);

  // Print geometry parameters

  G4cout << "\n The  WORLD   is made of "
         << worldSizeZ/mm << "mm of " << worldMaterial->GetName();
  G4cout << ", the transverse size (R) of the world is " 
         << worldSizeR/mm << " mm. " << G4endl;
  G4cout << " The ABSORBER is made of "
         << absorberThickness/mm << "mm of " << absorberMaterial->GetName();
  G4cout << ", the transverse size (R) is " 
         << absorberRadius/mm << " mm. " << G4endl;
  G4cout << " Z position of the (middle of the) absorber " 
         << absorberZ/mm << "  mm." << G4endl;

  G4cout << "radZ = " << radZ/mm << " mm" << G4endl;
  G4cout << "startZ = " << startZ/mm<< " mm" << G4endl;

  G4cout << "fRadThick = " << radThick/mm << " mm"<<G4endl;
  G4cout << "fFoilNumber = " << foilNumber << G4endl;
  G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
  G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
  G4cout << G4endl;

  return physicsWorld;
}

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