Gabriele Cosmo
379 lines
13 KiB
C++
379 lines
13 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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//
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/// \file B2aDetectorConstruction.cc
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/// \brief Implementation of the B2aDetectorConstruction class
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#include "B2aDetectorConstruction.hh"
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#include "B2aDetectorMessenger.hh"
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#include "B2TrackerSD.hh"
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#include "G4Material.hh"
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#include "G4NistManager.hh"
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#include "G4SDManager.hh"
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#include "G4Box.hh"
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#include "G4Tubs.hh"
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#include "G4LogicalVolume.hh"
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#include "G4PVPlacement.hh"
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#include "G4GlobalMagFieldMessenger.hh"
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#include "G4AutoDelete.hh"
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#include "G4GeometryTolerance.hh"
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#include "G4GeometryManager.hh"
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#include "G4UserLimits.hh"
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#include "G4VisAttributes.hh"
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#include "G4Colour.hh"
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#include "G4SystemOfUnits.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4ThreadLocal
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G4GlobalMagFieldMessenger* B2aDetectorConstruction::fMagFieldMessenger = 0;
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B2aDetectorConstruction::B2aDetectorConstruction()
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:G4VUserDetectorConstruction(),
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fNbOfChambers(0),
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fLogicTarget(NULL), fLogicChamber(NULL),
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fTargetMaterial(NULL), fChamberMaterial(NULL),
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fStepLimit(NULL),
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fCheckOverlaps(true)
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{
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fMessenger = new B2aDetectorMessenger(this);
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fNbOfChambers = 5;
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fLogicChamber = new G4LogicalVolume*[fNbOfChambers];
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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B2aDetectorConstruction::~B2aDetectorConstruction()
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{
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delete [] fLogicChamber;
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delete fStepLimit;
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delete fMessenger;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4VPhysicalVolume* B2aDetectorConstruction::Construct()
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{
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// Define materials
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DefineMaterials();
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// Define volumes
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return DefineVolumes();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::DefineMaterials()
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{
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// Material definition
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G4NistManager* nistManager = G4NistManager::Instance();
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// Air defined using NIST Manager
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nistManager->FindOrBuildMaterial("G4_AIR");
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// Lead defined using NIST Manager
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fTargetMaterial = nistManager->FindOrBuildMaterial("G4_Pb");
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// Xenon gas defined using NIST Manager
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fChamberMaterial = nistManager->FindOrBuildMaterial("G4_Xe");
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// Print materials
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G4cout << *(G4Material::GetMaterialTable()) << G4endl;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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G4VPhysicalVolume* B2aDetectorConstruction::DefineVolumes()
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{
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G4Material* air = G4Material::GetMaterial("G4_AIR");
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// Sizes of the principal geometrical components (solids)
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G4double chamberSpacing = 80*cm; // from chamber center to center!
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G4double chamberWidth = 20.0*cm; // width of the chambers
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G4double targetLength = 5.0*cm; // full length of Target
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G4double trackerLength = (fNbOfChambers+1)*chamberSpacing;
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G4double worldLength = 1.2 * (2*targetLength + trackerLength);
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G4double targetRadius = 0.5*targetLength; // Radius of Target
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targetLength = 0.5*targetLength; // Half length of the Target
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G4double trackerSize = 0.5*trackerLength; // Half length of the Tracker
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// Definitions of Solids, Logical Volumes, Physical Volumes
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// World
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G4GeometryManager::GetInstance()->SetWorldMaximumExtent(worldLength);
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G4cout << "Computed tolerance = "
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<< G4GeometryTolerance::GetInstance()->GetSurfaceTolerance()/mm
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<< " mm" << G4endl;
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G4Box* worldS
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= new G4Box("world", //its name
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worldLength/2,worldLength/2,worldLength/2); //its size
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G4LogicalVolume* worldLV
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= new G4LogicalVolume(
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worldS, //its solid
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air, //its material
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"World"); //its name
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// Must place the World Physical volume unrotated at (0,0,0).
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//
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G4VPhysicalVolume* worldPV
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= new G4PVPlacement(
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0, // no rotation
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G4ThreeVector(), // at (0,0,0)
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worldLV, // its logical volume
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"World", // its name
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0, // its mother volume
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false, // no boolean operations
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0, // copy number
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fCheckOverlaps); // checking overlaps
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// Target
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G4ThreeVector positionTarget = G4ThreeVector(0,0,-(targetLength+trackerSize));
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G4Tubs* targetS
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= new G4Tubs("target",0.,targetRadius,targetLength,0.*deg,360.*deg);
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fLogicTarget
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= new G4LogicalVolume(targetS, fTargetMaterial,"Target",0,0,0);
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new G4PVPlacement(0, // no rotation
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positionTarget, // at (x,y,z)
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fLogicTarget, // its logical volume
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"Target", // its name
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worldLV, // its mother volume
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false, // no boolean operations
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0, // copy number
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fCheckOverlaps); // checking overlaps
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G4cout << "Target is " << 2*targetLength/cm << " cm of "
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<< fTargetMaterial->GetName() << G4endl;
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// Tracker
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G4ThreeVector positionTracker = G4ThreeVector(0,0,0);
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G4Tubs* trackerS
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= new G4Tubs("tracker",0,trackerSize,trackerSize, 0.*deg, 360.*deg);
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G4LogicalVolume* trackerLV
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= new G4LogicalVolume(trackerS, air, "Tracker",0,0,0);
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new G4PVPlacement(0, // no rotation
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positionTracker, // at (x,y,z)
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trackerLV, // its logical volume
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"Tracker", // its name
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worldLV, // its mother volume
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false, // no boolean operations
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0, // copy number
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fCheckOverlaps); // checking overlaps
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// Visualization attributes
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G4VisAttributes* boxVisAtt= new G4VisAttributes(G4Colour(1.0,1.0,1.0));
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G4VisAttributes* chamberVisAtt = new G4VisAttributes(G4Colour(1.0,1.0,0.0));
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worldLV ->SetVisAttributes(boxVisAtt);
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fLogicTarget ->SetVisAttributes(boxVisAtt);
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trackerLV ->SetVisAttributes(boxVisAtt);
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// Tracker segments
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G4cout << "There are " << fNbOfChambers << " chambers in the tracker region. "
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<< G4endl
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<< "The chambers are " << chamberWidth/cm << " cm of "
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<< fChamberMaterial->GetName() << G4endl
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<< "The distance between chamber is " << chamberSpacing/cm << " cm"
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<< G4endl;
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G4double firstPosition = -trackerSize + chamberSpacing;
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G4double firstLength = trackerLength/10;
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G4double lastLength = trackerLength;
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G4double halfWidth = 0.5*chamberWidth;
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G4double rmaxFirst = 0.5 * firstLength;
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G4double rmaxIncr = 0.0;
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if( fNbOfChambers > 0 ){
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rmaxIncr = 0.5 * (lastLength-firstLength)/(fNbOfChambers-1);
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if (chamberSpacing < chamberWidth) {
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G4Exception("B2aDetectorConstruction::DefineVolumes()",
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"InvalidSetup", FatalException,
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"Width>Spacing");
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}
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}
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for (G4int copyNo=0; copyNo<fNbOfChambers; copyNo++) {
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G4double Zposition = firstPosition + copyNo * chamberSpacing;
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G4double rmax = rmaxFirst + copyNo * rmaxIncr;
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G4Tubs* chamberS
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= new G4Tubs("Chamber_solid", 0, rmax, halfWidth, 0.*deg, 360.*deg);
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fLogicChamber[copyNo] =
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new G4LogicalVolume(chamberS,fChamberMaterial,"Chamber_LV",0,0,0);
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fLogicChamber[copyNo]->SetVisAttributes(chamberVisAtt);
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new G4PVPlacement(0, // no rotation
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G4ThreeVector(0,0,Zposition), // at (x,y,z)
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fLogicChamber[copyNo], // its logical volume
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"Chamber_PV", // its name
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trackerLV, // its mother volume
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false, // no boolean operations
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copyNo, // copy number
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fCheckOverlaps); // checking overlaps
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}
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// Example of User Limits
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//
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// Below is an example of how to set tracking constraints in a given
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// logical volume
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//
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// Sets a max step length in the tracker region, with G4StepLimiter
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G4double maxStep = 0.5*chamberWidth;
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fStepLimit = new G4UserLimits(maxStep);
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trackerLV->SetUserLimits(fStepLimit);
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/// Set additional contraints on the track, with G4UserSpecialCuts
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///
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/// G4double maxLength = 2*trackerLength, maxTime = 0.1*ns, minEkin = 10*MeV;
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/// trackerLV->SetUserLimits(new G4UserLimits(maxStep,
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/// maxLength,
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/// maxTime,
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/// minEkin));
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// Always return the physical world
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return worldPV;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::ConstructSDandField()
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{
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// Sensitive detectors
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G4String trackerChamberSDname = "B2/TrackerChamberSD";
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B2TrackerSD* aTrackerSD = new B2TrackerSD(trackerChamberSDname,
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"TrackerHitsCollection");
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G4SDManager::GetSDMpointer()->AddNewDetector(aTrackerSD);
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// Setting aTrackerSD to all logical volumes with the same name
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// of "Chamber_LV".
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SetSensitiveDetector("Chamber_LV", aTrackerSD, true);
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// Create global magnetic field messenger.
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// Uniform magnetic field is then created automatically if
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// the field value is not zero.
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G4ThreeVector fieldValue = G4ThreeVector();
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fMagFieldMessenger = new G4GlobalMagFieldMessenger(fieldValue);
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fMagFieldMessenger->SetVerboseLevel(1);
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// Register the field messenger for deleting
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G4AutoDelete::Register(fMagFieldMessenger);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::SetTargetMaterial(G4String materialName)
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{
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G4NistManager* nistManager = G4NistManager::Instance();
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G4Material* pttoMaterial =
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nistManager->FindOrBuildMaterial(materialName);
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if (fTargetMaterial != pttoMaterial) {
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if ( pttoMaterial ) {
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fTargetMaterial = pttoMaterial;
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if (fLogicTarget) fLogicTarget->SetMaterial(fTargetMaterial);
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G4cout
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<< G4endl
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<< "----> The target is made of " << materialName << G4endl;
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} else {
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G4cout
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<< G4endl
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<< "--> WARNING from SetTargetMaterial : "
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<< materialName << " not found" << G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::SetChamberMaterial(G4String materialName)
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{
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G4NistManager* nistManager = G4NistManager::Instance();
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G4Material* pttoMaterial =
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nistManager->FindOrBuildMaterial(materialName);
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if (fChamberMaterial != pttoMaterial) {
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if ( pttoMaterial ) {
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fChamberMaterial = pttoMaterial;
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for (G4int copyNo=0; copyNo<fNbOfChambers; copyNo++) {
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if (fLogicChamber[copyNo]) fLogicChamber[copyNo]->
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SetMaterial(fChamberMaterial);
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}
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G4cout
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<< G4endl
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<< "----> The chambers are made of " << materialName << G4endl;
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} else {
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G4cout
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<< G4endl
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<< "--> WARNING from SetChamberMaterial : "
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<< materialName << " not found" << G4endl;
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}
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::SetMaxStep(G4double maxStep)
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{
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if ((fStepLimit)&&(maxStep>0.)) fStepLimit->SetMaxAllowedStep(maxStep);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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void B2aDetectorConstruction::SetCheckOverlaps(G4bool checkOverlaps)
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{
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fCheckOverlaps = checkOverlaps;
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}
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