TestEm10/src/DetectorBarr90.cc

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0025 //
0026 /// \file DetectorBarr90.cc
0027 /// \brief Implementation of the DetectorBarr90 class
0028
0029 #include "DetectorBarr90.hh"
0030
0031 #include "Materials.hh"
0032 #include "SensitiveDetector.hh"
0033
0034 #include "G4Box.hh"
0035 #include "G4FieldManager.hh"
0036 #include "G4LogicalVolume.hh"
0037 #include "G4Material.hh"
0038 #include "G4PVPlacement.hh"
0039 #include "G4Region.hh"
0040 #include "G4SDManager.hh"
0041 #include "G4SystemOfUnits.hh"
0042 #include "G4TransportationManager.hh"
0043 #include "G4UniformMagField.hh"
0044 #include "G4UnitsTable.hh"
0045 #include "G4ios.hh"
0046
0047 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0048
0049 DetectorBarr90::DetectorBarr90() : fRadiatorDescription(0) {}
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 DetectorBarr90::~DetectorBarr90()
0054 {
0055   // delete fRadiatorDescription;
0056   // the description is deleted in detector construction
0057 }
0058
0059 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0060
0061 G4VPhysicalVolume* DetectorBarr90::Construct()
0062 {
0063   // Geometry parameters
0064   //
0065
0066   G4cout << "DetectorBarr90 setup" << G4endl;
0067
0068   G4double worldSizeZ = 400. * cm;
0069   G4double worldSizeR = 20. * cm;
0070
0071   // Radiator and detector parameters
0072
0073   G4double radThickness = 0.019 * mm;
0074   G4double gasGap = 0.6 * mm;
0075   G4double foilGasRatio = radThickness / (radThickness + gasGap);
0076   G4double foilNumber = 350;
0077
0078   G4double absorberThickness = 50.0 * mm;
0079   G4double absorberRadius = 100. * mm;
0080
0081   G4double electrodeThick = 10.0 * micrometer;
0082   G4double windowThick = 51.0 * micrometer;
0083   G4double gapThick = 10.0 * cm;
0084   G4double detGap = 0.01 * mm;
0085
0086   G4double startZ = 100.0 * mm;
0087
0088   // Materials
0089   //
0090
0091   // Change to create materials using NIST
0092   G4Material* air = Materials::GetInstance()->GetMaterial("Air");
0093   G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
0094   G4Material* co2 = Materials::GetInstance()->GetMaterial("CO2");
0095   G4Material* xe55he15ch4 = Materials::GetInstance()->GetMaterial("Xe55He15CH4");
0096
0097   G4double foilDensity = ch2->GetDensity();
0098   G4double gasDensity = co2->GetDensity();
0099   G4double totDensity = foilDensity * foilGasRatio + gasDensity * (1.0 - foilGasRatio);
0100
0101   G4double fractionFoil = foilDensity * foilGasRatio / totDensity;
0102   G4double fractionGas = gasDensity * (1.0 - foilGasRatio) / totDensity;
0103   G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
0104   radiatorMat->AddMaterial(ch2, fractionFoil);
0105   radiatorMat->AddMaterial(co2, fractionGas);
0106
0107   // Radiator description
0108   fRadiatorDescription = new RadiatorDescription;
0109   fRadiatorDescription->fFoilMaterial = ch2;  // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
0110   fRadiatorDescription->fGasMaterial = co2;  // CO2; // He; //
0111   fRadiatorDescription->fFoilThickness = radThickness;
0112   fRadiatorDescription->fGasThickness = gasGap;
0113   fRadiatorDescription->fFoilNumber = foilNumber;
0114
0115   G4Material* worldMaterial = air;  // CO2;
0116   G4Material* absorberMaterial = xe55he15ch4;
0117
0118   // Volumes
0119   //
0120
0121   G4VSolid* solidWorld = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ / 2.);
0122
0123   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, worldMaterial, "World");
0124
0125   G4VPhysicalVolume* physicsWorld =
0126     new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
0127
0128   // TR radiator envelope
0129
0130   G4double radThick = foilNumber * (radThickness + gasGap) - gasGap + detGap;
0131   G4double radZ = startZ + 0.5 * radThick;
0132
0133   G4VSolid* solidRadiator =
0134     new G4Box("Radiator", 1.1 * absorberRadius, 1.1 * absorberRadius, 0.5 * radThick);
0135
0136   G4LogicalVolume* logicRadiator = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
0137
0138   new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
0139                     0);
0140
0141   fRadiatorDescription->fLogicalVolume = logicRadiator;
0142
0143   // create region for radiator
0144
0145   G4Region* radRegion = new G4Region("XTRradiator");
0146   radRegion->AddRootLogicalVolume(logicRadiator);
0147
0148   G4double windowZ = startZ + radThick + windowThick / 2. + 15.0 * mm;
0149
0150   G4double gapZ = windowZ + windowThick / 2. + gapThick / 2. + 0.01 * mm;
0151
0152   G4double electrodeZ = gapZ + gapThick / 2. + electrodeThick / 2. + 0.01 * mm;
0153
0154   // Absorber
0155
0156   G4double absorberZ = electrodeZ + electrodeThick / 2. + +absorberThickness / 2. + 0.01 * mm;
0157
0158   G4VSolid* solidAbsorber =
0159     new G4Box("Absorber", absorberRadius, absorberRadius, absorberThickness / 2.);
0160
0161   G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
0162
0163   new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
0164                     false, 0);
0165
0166   G4Region* regGasDet = new G4Region("XTRdEdxDetector");
0167   regGasDet->AddRootLogicalVolume(logicAbsorber);
0168
0169   // Sensitive Detectors: Absorber
0170
0171   SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
0172   G4SDManager::GetSDMpointer()->AddNewDetector(sd);
0173   logicAbsorber->SetSensitiveDetector(sd);
0174
0175   // Print geometry parameters
0176
0177   G4cout << "\n The  WORLD   is made of " << worldSizeZ / mm << "mm of "
0178          << worldMaterial->GetName();
0179   G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
0180   G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
0181          << absorberMaterial->GetName();
0182   G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
0183   G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << "  mm." << G4endl;
0184
0185   G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
0186   G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
0187
0188   G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
0189   G4cout << "fFoilNumber = " << foilNumber << G4endl;
0190   G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
0191   G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
0192   G4cout << G4endl;
0193
0194   return physicsWorld;
0195 }
0196
0197 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......