LXeDetectorConstruction.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// $Id: LXeDetectorConstruction.cc 77882 2013-11-29 08:39:07Z gcosmo $
//
//
//
#include "LXeDetectorConstruction.hh"
#include "LXePMTSD.hh"
#include "LXeScintSD.hh"
#include "LXeDetectorMessenger.hh"
#include "LXeMainVolume.hh"
#include "LXeWLSSlab.hh"

#include "G4SDManager.hh"
#include "G4RunManager.hh"

#include "G4GeometryManager.hh"
#include "G4SolidStore.hh"
#include "G4LogicalVolumeStore.hh"
#include "G4PhysicalVolumeStore.hh"
#include "G4LogicalBorderSurface.hh"
#include "G4LogicalSkinSurface.hh"

#include "G4OpticalSurface.hh"
#include "G4MaterialTable.hh"
#include "G4VisAttributes.hh"
#include "G4Material.hh"
#include "G4Box.hh"
#include "G4Tubs.hh"
#include "G4Sphere.hh"
#include "G4LogicalVolume.hh"
#include "G4ThreeVector.hh"
#include "G4PVPlacement.hh"
#include "globals.hh"
#include "G4UImanager.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"

G4bool LXeDetectorConstruction::fSphereOn = true;

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

LXeDetectorConstruction::LXeDetectorConstruction()
: fLXe_mt(NULL), fMPTPStyrene(NULL)
{
  fExperimentalHall_box = NULL;
  fExperimentalHall_log = NULL;
  fExperimentalHall_phys = NULL;

  fLXe = fAl = fAir = fVacuum = fGlass = NULL;
  fPstyrene = fPMMA = fPethylene1 = fPethylene2 = NULL;

  fN = fO = fC = fH = NULL;

  SetDefaults();

  fDetectorMessenger = new LXeDetectorMessenger(this);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

LXeDetectorConstruction::~LXeDetectorConstruction() {}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::DefineMaterials(){
  G4double a;  // atomic mass
  G4double z;  // atomic number
  G4double density;

  G4int polyPMMA = 1;
  G4int nC_PMMA = 3+2*polyPMMA;
  G4int nH_PMMA = 6+2*polyPMMA;

  G4int polyeth = 1;
  G4int nC_eth = 2*polyeth;
  G4int nH_eth = 4*polyeth;

  //***Elements
  fH = new G4Element("H", "H", z=1., a=1.01*g/mole);
  fC = new G4Element("C", "C", z=6., a=12.01*g/mole);
  fN = new G4Element("N", "N", z=7., a= 14.01*g/mole);
  fO = new G4Element("O"  , "O", z=8., a= 16.00*g/mole);

  //***Materials
  //Liquid Xenon
  fLXe = new G4Material("LXe",z=54.,a=131.29*g/mole,density=3.020*g/cm3);
  //Aluminum
  fAl = new G4Material("Al",z=13.,a=26.98*g/mole,density=2.7*g/cm3);
  //Vacuum
  fVacuum = new G4Material("Vacuum",z=1.,a=1.01*g/mole,
                          density=universe_mean_density,kStateGas,0.1*kelvin,
                          1.e-19*pascal);
  //Air
  fAir = new G4Material("Air", density= 1.29*mg/cm3, 2);
  fAir->AddElement(fN, 70*perCent);
  fAir->AddElement(fO, 30*perCent);
  //Glass
  fGlass = new G4Material("Glass", density=1.032*g/cm3,2);
  fGlass->AddElement(fC,91.533*perCent);
  fGlass->AddElement(fH,8.467*perCent);
  //Polystyrene
  fPstyrene = new G4Material("Polystyrene", density= 1.03*g/cm3, 2);
  fPstyrene->AddElement(fC, 8);
  fPstyrene->AddElement(fH, 8);
  //Fiber(PMMA)
  fPMMA = new G4Material("PMMA", density=1190*kg/m3,3);
  fPMMA->AddElement(fH,nH_PMMA);
  fPMMA->AddElement(fC,nC_PMMA);
  fPMMA->AddElement(fO,2);
  //Cladding(polyethylene)
  fPethylene1 = new G4Material("Pethylene1", density=1200*kg/m3,2);
  fPethylene1->AddElement(fH,nH_eth);
  fPethylene1->AddElement(fC,nC_eth);
  //Double cladding(flourinated polyethylene)
  fPethylene2 = new G4Material("Pethylene2", density=1400*kg/m3,2);
  fPethylene2->AddElement(fH,nH_eth);
  fPethylene2->AddElement(fC,nC_eth);
 
  //***Material properties tables

  const G4int lxenum = 3;
  G4double lxe_Energy[lxenum]    = { 7.0*eV , 7.07*eV, 7.14*eV };

  G4double lxe_SCINT[lxenum] = { 0.1, 1.0, 0.1 };
  G4double lxe_RIND[lxenum]  = { 1.59 , 1.57, 1.54 };
  G4double lxe_ABSL[lxenum]  = { 35.*cm, 35.*cm, 35.*cm};
  fLXe_mt = new G4MaterialPropertiesTable();
  fLXe_mt->AddProperty("FASTCOMPONENT", lxe_Energy, lxe_SCINT, lxenum);
  fLXe_mt->AddProperty("SLOWCOMPONENT", lxe_Energy, lxe_SCINT, lxenum);
  fLXe_mt->AddProperty("RINDEX",        lxe_Energy, lxe_RIND,  lxenum);
  fLXe_mt->AddProperty("ABSLENGTH",     lxe_Energy, lxe_ABSL,  lxenum);
  fLXe_mt->AddConstProperty("SCINTILLATIONYIELD",12000./MeV);
  fLXe_mt->AddConstProperty("RESOLUTIONSCALE",1.0);
  fLXe_mt->AddConstProperty("FASTTIMECONSTANT",20.*ns);
  fLXe_mt->AddConstProperty("SLOWTIMECONSTANT",45.*ns);
  fLXe_mt->AddConstProperty("YIELDRATIO",1.0);
  fLXe->SetMaterialPropertiesTable(fLXe_mt);

  // Set the Birks Constant for the LXe scintillator

  fLXe->GetIonisation()->SetBirksConstant(0.126*mm/MeV);
 
  G4double glass_RIND[lxenum]={1.49,1.49,1.49};
  G4double glass_AbsLength[lxenum]={420.*cm,420.*cm,420.*cm};
  G4MaterialPropertiesTable *glass_mt = new G4MaterialPropertiesTable();
  glass_mt->AddProperty("ABSLENGTH",lxe_Energy,glass_AbsLength,lxenum);
  glass_mt->AddProperty("RINDEX",lxe_Energy,glass_RIND,lxenum);
  fGlass->SetMaterialPropertiesTable(glass_mt);

  G4double vacuum_Energy[lxenum]={2.0*eV,7.0*eV,7.14*eV};
  G4double vacuum_RIND[lxenum]={1.,1.,1.};
  G4MaterialPropertiesTable *vacuum_mt = new G4MaterialPropertiesTable();
  vacuum_mt->AddProperty("RINDEX", vacuum_Energy, vacuum_RIND,lxenum);
  fVacuum->SetMaterialPropertiesTable(vacuum_mt);
  fAir->SetMaterialPropertiesTable(vacuum_mt);//Give air the same rindex

  const G4int wlsnum = 4;
  G4double wls_Energy[] = {2.00*eV,2.87*eV,2.90*eV,3.47*eV};
 
  G4double rIndexPstyrene[wlsnum]={ 1.5, 1.5, 1.5, 1.5};
  G4double absorption1[wlsnum]={2.*cm, 2.*cm, 2.*cm, 2.*cm};
  G4double scintilFast[wlsnum]={0.00, 0.00, 1.00, 1.00};
  fMPTPStyrene = new G4MaterialPropertiesTable();
  fMPTPStyrene->AddProperty("RINDEX",wls_Energy,rIndexPstyrene,wlsnum);
  fMPTPStyrene->AddProperty("ABSLENGTH",wls_Energy,absorption1,wlsnum);
  fMPTPStyrene->AddProperty("FASTCOMPONENT",wls_Energy, scintilFast,wlsnum);
  fMPTPStyrene->AddConstProperty("SCINTILLATIONYIELD",10./keV);
  fMPTPStyrene->AddConstProperty("RESOLUTIONSCALE",1.0);
  fMPTPStyrene->AddConstProperty("FASTTIMECONSTANT", 10.*ns);
  fPstyrene->SetMaterialPropertiesTable(fMPTPStyrene);

  // Set the Birks Constant for the Polystyrene scintillator

  fPstyrene->GetIonisation()->SetBirksConstant(0.126*mm/MeV);

  G4double RefractiveIndexFiber[wlsnum]={ 1.60, 1.60, 1.60, 1.60};
  G4double AbsFiber[wlsnum]={9.00*m,9.00*m,0.1*mm,0.1*mm};
  G4double EmissionFib[wlsnum]={1.0, 1.0, 0.0, 0.0};
  G4MaterialPropertiesTable* fiberProperty = new G4MaterialPropertiesTable();
  fiberProperty->AddProperty("RINDEX",wls_Energy,RefractiveIndexFiber,wlsnum);
  fiberProperty->AddProperty("WLSABSLENGTH",wls_Energy,AbsFiber,wlsnum);
  fiberProperty->AddProperty("WLSCOMPONENT",wls_Energy,EmissionFib,wlsnum);
  fiberProperty->AddConstProperty("WLSTIMECONSTANT", 0.5*ns);
  fPMMA->SetMaterialPropertiesTable(fiberProperty);

  G4double RefractiveIndexClad1[wlsnum]={ 1.49, 1.49, 1.49, 1.49};
  G4MaterialPropertiesTable* clad1Property = new G4MaterialPropertiesTable();
  clad1Property->AddProperty("RINDEX",wls_Energy,RefractiveIndexClad1,wlsnum);
  clad1Property->AddProperty("ABSLENGTH",wls_Energy,AbsFiber,wlsnum);
  fPethylene1->SetMaterialPropertiesTable(clad1Property);

  G4double RefractiveIndexClad2[wlsnum]={ 1.42, 1.42, 1.42, 1.42};
  G4MaterialPropertiesTable* clad2Property = new G4MaterialPropertiesTable();
  clad2Property->AddProperty("RINDEX",wls_Energy,RefractiveIndexClad2,wlsnum);
  clad2Property->AddProperty("ABSLENGTH",wls_Energy,AbsFiber,wlsnum);
  fPethylene2->SetMaterialPropertiesTable(clad2Property);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4VPhysicalVolume* LXeDetectorConstruction::Construct(){

  if (fExperimentalHall_phys) {
     G4GeometryManager::GetInstance()->OpenGeometry();
     G4PhysicalVolumeStore::GetInstance()->Clean();
     G4LogicalVolumeStore::GetInstance()->Clean();
     G4SolidStore::GetInstance()->Clean();
     G4LogicalSkinSurface::CleanSurfaceTable();
     G4LogicalBorderSurface::CleanSurfaceTable();
  }

  DefineMaterials();
  return ConstructDetector();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4VPhysicalVolume* LXeDetectorConstruction::ConstructDetector()
{
  //The experimental hall walls are all 1m away from housing walls
  G4double expHall_x = fScint_x+fD_mtl+1.*m;
  G4double expHall_y = fScint_y+fD_mtl+1.*m;
  G4double expHall_z = fScint_z+fD_mtl+1.*m;

  //Create experimental hall
  fExperimentalHall_box
    = new G4Box("expHall_box",expHall_x,expHall_y,expHall_z);
  fExperimentalHall_log = new G4LogicalVolume(fExperimentalHall_box,
                                             fVacuum,"expHall_log",0,0,0);
  fExperimentalHall_phys = new G4PVPlacement(0,G4ThreeVector(),
                              fExperimentalHall_log,"expHall",0,false,0);

  fExperimentalHall_log->SetVisAttributes(G4VisAttributes::Invisible);

  //Place the main volume
  if(fMainVolumeOn){
    fMainVolume
      = new LXeMainVolume(0,G4ThreeVector(),fExperimentalHall_log,false,0,this);
  }

  //Place the WLS slab
  if(fWLSslab){
    G4VPhysicalVolume* slab = new LXeWLSSlab(0,G4ThreeVector(0.,0.,
                                             -fScint_z/2.-fSlab_z-1.*cm),
                                             fExperimentalHall_log,false,0,
                                             this);

    //Surface properties for the WLS slab
    G4OpticalSurface* scintWrap = new G4OpticalSurface("ScintWrap");
 
    new G4LogicalBorderSurface("ScintWrap", slab,
                               fExperimentalHall_phys,
                               scintWrap);
 
    scintWrap->SetType(dielectric_metal);
    scintWrap->SetFinish(polished);
    scintWrap->SetModel(glisur);

    const G4int num = 2;

    G4double pp[num] = {2.0*eV, 3.5*eV};
    G4double reflectivity[num] = {1., 1.};
    G4double efficiency[num] = {0.0, 0.0};
    
    G4MaterialPropertiesTable* scintWrapProperty 
      = new G4MaterialPropertiesTable();

    scintWrapProperty->AddProperty("REFLECTIVITY",pp,reflectivity,num);
    scintWrapProperty->AddProperty("EFFICIENCY",pp,efficiency,num);
    scintWrap->SetMaterialPropertiesTable(scintWrapProperty);
  }

  return fExperimentalHall_phys;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::ConstructSDandField() {

  if (!fMainVolume) return;

  // PMT SD

  if (!fPmt_SD.Get()) {
    //Created here so it exists as pmts are being placed
    G4cout << "Construction /LXeDet/pmtSD" << G4endl;
    LXePMTSD* pmt_SD = new LXePMTSD("/LXeDet/pmtSD");
    fPmt_SD.Put(pmt_SD);

    pmt_SD->InitPMTs((fNx*fNy+fNx*fNz+fNy*fNz)*2); //let pmtSD know # of pmts
    pmt_SD->SetPmtPositions(fMainVolume->GetPmtPositions());
  }

  //sensitive detector is not actually on the photocathode.
  //processHits gets done manually by the stepping action.
  //It is used to detect when photons hit and get absorbed&detected at the
  //boundary to the photocathode (which doesnt get done by attaching it to a
  //logical volume.
  //It does however need to be attached to something or else it doesnt get
  //reset at the begining of events

  SetSensitiveDetector(fMainVolume->GetLogPhotoCath(), fPmt_SD.Get());

  // Scint SD

  if (!fScint_SD.Get()) {
    G4cout << "Construction /LXeDet/scintSD" << G4endl;
    LXeScintSD* scint_SD = new LXeScintSD("/LXeDet/scintSD");
    fScint_SD.Put(scint_SD);
  }
  SetSensitiveDetector(fMainVolume->GetLogScint(), fScint_SD.Get());
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetDimensions(G4ThreeVector dims) {
  this->fScint_x=dims[0];
  this->fScint_y=dims[1];
  this->fScint_z=dims[2];
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetHousingThickness(G4double d_mtl) {
  this->fD_mtl=d_mtl;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetNX(G4int nx) {
  this->fNx=nx;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetNY(G4int ny) {
  this->fNy=ny;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetNZ(G4int nz) {
  this->fNz=nz;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetPMTRadius(G4double outerRadius_pmt) {
  this->fOuterRadius_pmt=outerRadius_pmt;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetDefaults() {

  //Resets to default values
  fD_mtl=0.0635*cm;

  fScint_x = 17.8*cm;
  fScint_y = 17.8*cm;
  fScint_z = 22.6*cm;

  fNx = 2;
  fNy = 2;
  fNz = 3;

  fOuterRadius_pmt = 2.3*cm;

  fSphereOn = true;
  fRefl=1.0;

  fNfibers=15;
  fWLSslab=false;
  fMainVolumeOn=true;
  fMainVolume=NULL;
  fSlab_z=2.5*mm;

  G4UImanager::GetUIpointer()
    ->ApplyCommand("/LXe/detector/scintYieldFactor 1.");

  if(fLXe_mt)fLXe_mt->AddConstProperty("SCINTILLATIONYIELD",12000./MeV);
  if(fMPTPStyrene)fMPTPStyrene->AddConstProperty("SCINTILLATIONYIELD",10./keV);

  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetSphereOn(G4bool b) {
  fSphereOn=b;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetHousingReflectivity(G4double r) {
  fRefl=r;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetWLSSlabOn(G4bool b) {
  fWLSslab=b;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetMainVolumeOn(G4bool b) {
  fMainVolumeOn=b;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetNFibers(G4int n) {
  fNfibers=n;
  G4RunManager::GetRunManager()->ReinitializeGeometry();
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void LXeDetectorConstruction::SetMainScintYield(G4double y) {
  fLXe_mt->AddConstProperty("SCINTILLATIONYIELD",y/MeV);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
void LXeDetectorConstruction::SetWLSScintYield(G4double y) {
  fMPTPStyrene->AddConstProperty("SCINTILLATIONYIELD",y/MeV);
}