TestEm10/src/DetectorHarris73.cc

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0026 /// \file electromagnetic/TestEm10/src/DetectorHarris73.cc
0027 /// \brief Implementation of the DetectorHarris73 class
0028 //
0029 //
0030 //
0031 //
0032
0033 #include "DetectorHarris73.hh"
0034
0035 #include "Materials.hh"
0036 #include "SensitiveDetector.hh"
0037
0038 #include "G4Box.hh"
0039 #include "G4FieldManager.hh"
0040 #include "G4LogicalVolume.hh"
0041 #include "G4Material.hh"
0042 #include "G4PVPlacement.hh"
0043 #include "G4Region.hh"
0044 #include "G4SDManager.hh"
0045 #include "G4SystemOfUnits.hh"
0046 #include "G4TransportationManager.hh"
0047 #include "G4UniformMagField.hh"
0048 #include "G4UnitsTable.hh"
0049 #include "G4ios.hh"
0050
0051 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0052
0053 DetectorHarris73::DetectorHarris73() : fRadiatorDescription(0) {}
0054
0055 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0056
0057 DetectorHarris73::~DetectorHarris73()
0058 {
0059   // delete fRadiatorDescription;
0060   // the description is deleted in detector construction
0061 }
0062
0063 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0064
0065 G4VPhysicalVolume* DetectorHarris73::Construct()
0066 {
0067   // Geometry parameters
0068   //
0069
0070   G4cout << "DetectorHarris73 setup" << G4endl;
0071
0072   G4double worldSizeZ = 400. * cm;
0073   G4double worldSizeR = 20. * cm;
0074
0075   // Radiator and detector parameters
0076
0077   G4double radThickness = 0.0127 * mm;
0078   G4double gasGap = 0.762 * mm;
0079   G4double foilGasRatio = radThickness / (radThickness + gasGap);
0080   G4double foilNumber = 100;
0081
0082   G4double absorberThickness = 15.0 * mm;
0083   G4double absorberRadius = 100. * mm;
0084
0085   G4double windowThick = 51.0 * micrometer;
0086   G4double electrodeThick = 10.0 * micrometer;
0087   G4double gapThick = 10.0 * cm;
0088   G4double detGap = 0.01 * mm;
0089
0090   G4double startZ = 100.0 * mm;
0091
0092   // Materials
0093   //
0094
0095   // Change to create materials using NIST
0096   G4Material* air = Materials::GetInstance()->GetMaterial("Air");
0097   G4Material* mylar = Materials::GetInstance()->GetMaterial("Mylar");
0098   G4Material* kr7ch4 = Materials::GetInstance()->GetMaterial("Kr7CH4");
0099
0100   // Preparation of mixed radiator material
0101
0102   G4double foilDensity = mylar->GetDensity();
0103   G4double gasDensity = air->GetDensity();
0104   G4double totDensity = foilDensity * foilGasRatio + gasDensity * (1.0 - foilGasRatio);
0105
0106   G4double fractionFoil = foilDensity * foilGasRatio / totDensity;
0107   G4double fractionGas = gasDensity * (1.0 - foilGasRatio) / totDensity;
0108   G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
0109   radiatorMat->AddMaterial(mylar, fractionFoil);
0110   radiatorMat->AddMaterial(air, fractionGas);
0111
0112   // Radiator description
0113   fRadiatorDescription = new RadiatorDescription;
0114   fRadiatorDescription->fFoilMaterial = mylar;  // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
0115   fRadiatorDescription->fGasMaterial = air;  // CO2; // He; //
0116   fRadiatorDescription->fFoilThickness = radThickness;
0117   fRadiatorDescription->fGasThickness = gasGap;
0118   fRadiatorDescription->fFoilNumber = foilNumber;
0119
0120   G4Material* worldMaterial = air;  // CO2;
0121   G4Material* absorberMaterial = kr7ch4;
0122
0123   // Volumes
0124   //
0125
0126   G4VSolid* solidWorld = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ / 2.);
0127
0128   G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, worldMaterial, "World");
0129
0130   G4VPhysicalVolume* physicsWorld =
0131     new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
0132
0133   // TR radiator envelope
0134
0135   G4double radThick = foilNumber * (radThickness + gasGap) - gasGap + detGap;
0136   G4double radZ = startZ + 0.5 * radThick;
0137
0138   G4VSolid* solidRadiator =
0139     new G4Box("Radiator", 1.1 * absorberRadius, 1.1 * absorberRadius, 0.5 * radThick);
0140
0141   G4LogicalVolume* logicRadiator = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
0142
0143   fRadiatorDescription->fLogicalVolume = logicRadiator;
0144
0145   new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
0146                     0);
0147
0148   // create region for radiator
0149
0150   G4Region* radRegion = new G4Region("XTRradiator");
0151   radRegion->AddRootLogicalVolume(logicRadiator);
0152
0153   G4double windowZ = startZ + radThick + windowThick / 2. + 15.0 * mm;
0154
0155   G4double gapZ = windowZ + windowThick / 2. + gapThick / 2. + 0.01 * mm;
0156
0157   G4double electrodeZ = gapZ + gapThick / 2. + electrodeThick / 2. + 0.01 * mm;
0158
0159   // Absorber
0160
0161   G4double absorberZ = electrodeZ + electrodeThick / 2. + absorberThickness / 2. + 0.01 * mm;
0162
0163   G4VSolid* solidAbsorber =
0164     new G4Box("Absorber", absorberRadius, absorberRadius, absorberThickness / 2.);
0165
0166   G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
0167
0168   new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
0169                     false, 0);
0170
0171   G4Region* regGasDet = new G4Region("XTRdEdxDetector");
0172   regGasDet->AddRootLogicalVolume(logicAbsorber);
0173
0174   // Sensitive Detectors: Absorber
0175
0176   SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
0177   G4SDManager::GetSDMpointer()->AddNewDetector(sd);
0178   logicAbsorber->SetSensitiveDetector(sd);
0179
0180   // Print geometry parameters
0181
0182   G4cout << "\n The  WORLD   is made of " << worldSizeZ / mm << "mm of "
0183          << worldMaterial->GetName();
0184   G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
0185   G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
0186          << absorberMaterial->GetName();
0187   G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
0188   G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << "  mm." << G4endl;
0189
0190   G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
0191   G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
0192
0193   G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
0194   G4cout << "fFoilNumber = " << foilNumber << G4endl;
0195   G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
0196   G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
0197   G4cout << G4endl;
0198
0199   return physicsWorld;
0200 }
0201
0202 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......