Gabriele Cosmo
231 lines
8.5 KiB
C++
231 lines
8.5 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/// \file DetectorALICE06.cc
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/// \brief Implementation of the DetectorALICE06 class
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#include "DetectorALICE06.hh"
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#include "Materials.hh"
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#include "SensitiveDetector.hh"
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#include "G4Box.hh"
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#include "G4FieldManager.hh"
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#include "G4LogicalVolume.hh"
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#include "G4Material.hh"
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#include "G4PVPlacement.hh"
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#include "G4Region.hh"
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#include "G4SDManager.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4TransportationManager.hh"
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#include "G4UniformMagField.hh"
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#include "G4UnitsTable.hh"
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#include "G4ios.hh"
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#include <cmath>
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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DetectorALICE06::DetectorALICE06() : fRadiatorDescription(0) {}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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DetectorALICE06::~DetectorALICE06()
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{
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// delete fRadiatorDescription;
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// the description is deleted in detector construction
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4VPhysicalVolume* DetectorALICE06::Construct()
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{
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// Geometry parameters
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//
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G4cout << "DetectorALICE06 setup" << G4endl;
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G4double worldSizeZ = 600. * cm;
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G4double worldSizeR = 22. * cm;
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// Radiator and detector parameters
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G4double radThickness = 0.020 * mm;
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G4double gasGap = 0.500 * mm;
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G4double foilGasRatio = radThickness / (radThickness + gasGap);
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G4int foilNumber = 120;
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G4double absorberThickness = 37 * mm;
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G4double absorberRadius = 100. * mm;
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G4double electrodeThick = 100.0 * micrometer;
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G4double pipeLength = 160.0 * cm;
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G4double mylarThick = 20.0 * micrometer;
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G4double detGap = 0.01 * mm;
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G4double startZ = 100.0 * mm;
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// Materials
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//
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// Change to create materials using NIST
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G4Material* air = Materials::GetInstance()->GetMaterial("Air");
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G4Material* ch2 = Materials::GetInstance()->GetMaterial("CH2");
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G4Material* xe15CO2 = Materials::GetInstance()->GetMaterial("Xe15CO2");
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G4double foilDensity = ch2->GetDensity();
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G4double gasDensity = air->GetDensity();
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G4double totDensity = foilDensity * foilGasRatio + gasDensity * (1.0 - foilGasRatio);
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G4double fractionFoil = foilDensity * foilGasRatio / totDensity;
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G4double fractionGas = 1.0 - fractionFoil;
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G4Material* radiatorMat = new G4Material("radiatorMat", totDensity, 2);
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radiatorMat->AddMaterial(ch2, fractionFoil);
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radiatorMat->AddMaterial(air, fractionGas);
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// Radiator description
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fRadiatorDescription = new RadiatorDescription;
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fRadiatorDescription->fFoilMaterial = ch2; // CH2; // Kapton; // Mylar ; // Li ; // CH2 ;
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fRadiatorDescription->fGasMaterial = air; // CO2; // He; //
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fRadiatorDescription->fFoilThickness = radThickness;
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fRadiatorDescription->fGasThickness = gasGap;
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fRadiatorDescription->fFoilNumber = foilNumber;
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G4Material* worldMaterial = air; // CO2;
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G4Material* absorberMaterial = xe15CO2;
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// Volumes
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//
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G4VSolid* solidWorld = new G4Box("World", worldSizeR, worldSizeR, worldSizeZ / 2.);
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G4LogicalVolume* logicWorld = new G4LogicalVolume(solidWorld, worldMaterial, "World");
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G4VPhysicalVolume* physicsWorld =
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new G4PVPlacement(0, G4ThreeVector(), "World", logicWorld, 0, false, 0);
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// TR radiator envelope
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G4double radThick = foilNumber * (radThickness + gasGap) - gasGap + detGap;
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G4double radZ = startZ + 0.5 * radThick;
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G4VSolid* solidRadiator =
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new G4Box("Radiator", 1.1 * absorberRadius, 1.1 * absorberRadius, 0.5 * radThick);
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G4LogicalVolume* logicRadiator = new G4LogicalVolume(solidRadiator, radiatorMat, "Radiator");
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new G4PVPlacement(0, G4ThreeVector(0, 0, radZ), "Radiator", logicRadiator, physicsWorld, false,
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0);
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fRadiatorDescription->fLogicalVolume = logicRadiator;
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// Create region for radiator
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G4Region* radRegion = new G4Region("XTRradiator");
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radRegion->AddRootLogicalVolume(logicRadiator);
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// Drift Electrode on both sides of Radiator
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// (not placed)
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G4double zElectrode1 = radZ - radThick / 2. - electrodeThick / 2.;
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G4double zElectrode2 = radZ + radThick / 2. + electrodeThick / 2.;
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G4cout << "zElectrode1 = " << zElectrode1 / mm << " mm" << G4endl;
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G4cout << "zElectrode2 = " << zElectrode2 / mm << " mm" << G4endl;
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G4cout << "fElectrodeThick = " << electrodeThick / mm << " mm" << G4endl << G4endl;
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// Helium Pipe
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// (not placed)
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// Distance between pipe and radiator / absorber
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G4double pipeDist = 1. * cm;
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G4double zPipe = zElectrode2 + electrodeThick / 2. + pipeDist / 2. + pipeLength / 2.;
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G4cout << "zPipe = " << zPipe / mm << " mm" << G4endl;
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G4cout << "pipeLength = " << pipeLength / mm << " mm" << G4endl << G4endl;
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// Mylar Foil on both sides of helium pipe
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// (not placed)
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G4double zMylar1 = zPipe - pipeLength / 2. - mylarThick / 2. - 0.001 * mm;
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G4double zMylar2 = zPipe + pipeLength / 2. + mylarThick / 2. + 0.001 * mm;
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G4cout << "zMylar1 = " << zMylar1 / mm << " mm" << G4endl;
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G4cout << "zMylar2 = " << zMylar2 / mm << " mm" << G4endl;
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G4cout << "fMylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
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// Mylar Foil on Chamber
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// (not placed)
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G4double zMylar = zElectrode2 + electrodeThick / 2. + mylarThick / 2. + 1.0 * mm;
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zMylar += (pipeLength + pipeDist);
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G4cout << "zMylar = " << zMylar / mm << " mm" << G4endl;
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G4cout << "mylarThick = " << mylarThick / mm << " mm" << G4endl << G4endl;
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// Absorber
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G4double absorberZ = zMylar + mylarThick + absorberThickness / 2.;
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G4VSolid* solidAbsorber = new G4Box("Absorber", absorberRadius, 10. * mm, absorberThickness / 2.);
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G4LogicalVolume* logicAbsorber = new G4LogicalVolume(solidAbsorber, absorberMaterial, "Absorber");
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new G4PVPlacement(0, G4ThreeVector(0., 0., absorberZ), "Absorber", logicAbsorber, physicsWorld,
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false, 0);
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G4Region* regGasDet = new G4Region("XTRdEdxDetector");
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regGasDet->AddRootLogicalVolume(logicAbsorber);
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// Sensitive Detectors: Absorber
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SensitiveDetector* sd = new SensitiveDetector("AbsorberSD");
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G4SDManager::GetSDMpointer()->AddNewDetector(sd);
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logicAbsorber->SetSensitiveDetector(sd);
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// Print geometry parameters
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G4cout << "\n The WORLD is made of " << worldSizeZ / mm << "mm of "
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<< worldMaterial->GetName();
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G4cout << ", the transverse size (R) of the world is " << worldSizeR / mm << " mm. " << G4endl;
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G4cout << " The ABSORBER is made of " << absorberThickness / mm << "mm of "
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<< absorberMaterial->GetName();
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G4cout << ", the transverse size (R) is " << absorberRadius / mm << " mm. " << G4endl;
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G4cout << " Z position of the (middle of the) absorber " << absorberZ / mm << " mm." << G4endl;
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G4cout << "radZ = " << radZ / mm << " mm" << G4endl;
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G4cout << "startZ = " << startZ / mm << " mm" << G4endl;
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G4cout << "fRadThick = " << radThick / mm << " mm" << G4endl;
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G4cout << "fFoilNumber = " << foilNumber << G4endl;
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G4cout << "fRadiatorMat = " << radiatorMat->GetName() << G4endl;
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G4cout << "WorldMaterial = " << worldMaterial->GetName() << G4endl;
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G4cout << G4endl;
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return physicsWorld;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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