TestEm10/src/DetectorALICE06.cc

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0026 /// \file electromagnetic/TestEm10/src/DetectorALICE06.cc
0027 /// \brief Implementation of the DetectorALICE06 class
0028 //
0029 //
0030 //
0031 //
0032
0033 #include "DetectorALICE06.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 #include <cmath>
0052
0053 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0054
0055 DetectorALICE06::DetectorALICE06() : fRadiatorDescription(0) {}
0056
0057 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0058
0059 DetectorALICE06::~DetectorALICE06()
0060 {
0061   // delete fRadiatorDescription;
0062   // the description is deleted in detector construction
0063 }
0064
0065 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
0066
0067 G4VPhysicalVolume* DetectorALICE06::Construct()
0068 {
0069   // Geometry parameters
0070   //
0071
0072   G4cout << "DetectorALICE06 setup" << G4endl;
0073
0074   G4double worldSizeZ = 600. * cm;
0075   G4double worldSizeR = 22. * cm;
0076
0077   // Radiator and detector parameters
0078
0079   G4double radThickness = 0.020 * mm;
0080   G4double gasGap = 0.500 * mm;
0081   G4double foilGasRatio = radThickness / (radThickness + gasGap);
0082   G4int foilNumber = 120;
0083
0084   G4double absorberThickness = 37 * mm;
0085   G4double absorberRadius = 100. * mm;
0086
0087   G4double electrodeThick = 100.0 * micrometer;
0088   G4double pipeLength = 160.0 * cm;
0089   G4double mylarThick = 20.0 * micrometer;
0090   G4double detGap = 0.01 * mm;
0091
0092   G4double startZ = 100.0 * mm;
0093
0094   // Materials
0095   //
0096
0097   // Change to create materials using NIST
0098   G4Material* air = Materials::GetInstance()->GetMaterial("Air");
0099   G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
0100   G4Material* xe15CO2 = Materials::GetInstance()->GetMaterial("Xe15CO2");
0101
0102   G4double foilDensity = ch2->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 = 1.0 - fractionFoil;
0108   G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
0109   radiatorMat->AddMaterial(ch2, fractionFoil);
0110   radiatorMat->AddMaterial(air, fractionGas);
0111
0112   // Radiator description
0113   fRadiatorDescription = new RadiatorDescription;
0114   fRadiatorDescription->fFoilMaterial = ch2;  // 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 = xe15CO2;
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   new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
0144                     0);
0145
0146   fRadiatorDescription->fLogicalVolume = logicRadiator;
0147
0148   // Create region for radiator
0149
0150   G4Region* radRegion = new G4Region("XTRradiator");
0151   radRegion->AddRootLogicalVolume(logicRadiator);
0152
0153   // Drift Electrode on both sides of Radiator
0154   // (not placed)
0155
0156   G4double zElectrode1 = radZ - radThick / 2. - electrodeThick / 2.;
0157   G4double zElectrode2 = radZ + radThick / 2. + electrodeThick / 2.;
0158
0159   G4cout << "zElectrode1 = " << zElectrode1 / mm << " mm" << G4endl;
0160   G4cout << "zElectrode2 = " << zElectrode2 / mm << " mm" << G4endl;
0161   G4cout << "fElectrodeThick = " << electrodeThick / mm << " mm" << G4endl << G4endl;
0162
0163   // Helium Pipe
0164   // (not placed)
0165
0166   // Distance between pipe and radiator / absorber
0167   G4double pipeDist = 1. * cm;
0168   G4double zPipe = zElectrode2 + electrodeThick / 2. + pipeDist / 2. + pipeLength / 2.;
0169
0170   G4cout << "zPipe = " << zPipe / mm << " mm" << G4endl;
0171   G4cout << "pipeLength = " << pipeLength / mm << " mm" << G4endl << G4endl;
0172
0173   // Mylar Foil on both sides of helium pipe
0174   // (not placed)
0175
0176   G4double zMylar1 = zPipe - pipeLength / 2. - mylarThick / 2. - 0.001 * mm;
0177   G4double zMylar2 = zPipe + pipeLength / 2. + mylarThick / 2. + 0.001 * mm;
0178
0179   G4cout << "zMylar1 = " << zMylar1 / mm << " mm" << G4endl;
0180   G4cout << "zMylar2 = " << zMylar2 / mm << " mm" << G4endl;
0181   G4cout << "fMylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
0182
0183   // Mylar Foil on Chamber
0184   // (not placed)
0185
0186   G4double zMylar = zElectrode2 + electrodeThick / 2. + mylarThick / 2. + 1.0 * mm;
0187   zMylar += (pipeLength + pipeDist);
0188
0189   G4cout << "zMylar = " << zMylar / mm << " mm" << G4endl;
0190   G4cout << "mylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
0191
0192   // Absorber
0193
0194   G4double absorberZ = zMylar + mylarThick + absorberThickness / 2.;
0195
0196   G4VSolid* solidAbsorber = new G4Box("Absorber", absorberRadius, 10. * mm, absorberThickness / 2.);
0197
0198   G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
0199
0200   new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
0201                     false, 0);
0202
0203   G4Region* regGasDet = new G4Region("XTRdEdxDetector");
0204   regGasDet->AddRootLogicalVolume(logicAbsorber);
0205
0206   // Sensitive Detectors: Absorber
0207
0208   SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
0209   G4SDManager::GetSDMpointer()->AddNewDetector(sd);
0210   logicAbsorber->SetSensitiveDetector(sd);
0211
0212   // Print geometry parameters
0213
0214   G4cout << "\n The  WORLD   is made of " << worldSizeZ / mm << "mm of "
0215          << worldMaterial->GetName();
0216   G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
0217   G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
0218          << absorberMaterial->GetName();
0219   G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
0220   G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << "  mm." << G4endl;
0221
0222   G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
0223   G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
0224
0225   G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
0226   G4cout << "fFoilNumber = " << foilNumber << G4endl;
0227   G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
0228   G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
0229   G4cout << G4endl;
0230
0231   return physicsWorld;
0232 }
0233
0234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......