G4VEmProcess.cc

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4VEmProcess
//
// Author:        Vladimir Ivanchenko on base of Laszlo Urban code
//
// Creation date: 01.10.2003
//
// Modifications: by V.Ivanchenko
//
// Class Description: based class for discrete and rest/discrete EM processes
//
 
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
#include "G4VEmProcess.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4ProcessManager.hh"
#include "G4LossTableManager.hh"
#include "G4LossTableBuilder.hh"
#include "G4Step.hh"
#include "G4ParticleDefinition.hh"
#include "G4VEmModel.hh"
#include "G4DataVector.hh"
#include "G4PhysicsTable.hh"
#include "G4EmDataHandler.hh"
#include "G4PhysicsLogVector.hh"
#include "G4VParticleChange.hh"
#include "G4PhysicsModelCatalog.hh"
#include "G4ProductionCutsTable.hh"
#include "G4Region.hh"
#include "G4Gamma.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4PhysicsTableHelper.hh"
#include "G4EmBiasingManager.hh"
#include "G4EmParameters.hh"
#include "G4EmProcessSubType.hh"
#include "G4LowEnergyEmProcessSubType.hh"
#include "G4DNAModelSubType.hh"
#include "G4GenericIon.hh"
#include "G4Log.hh"
#include <iostream>
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4VEmProcess::G4VEmProcess(const G4String& name, G4ProcessType type):
  G4VDiscreteProcess(name, type)
{
  theParameters = G4EmParameters::Instance();
  SetVerboseLevel(1);
 
  // Size of tables
  minKinEnergy = 0.1*CLHEP::keV;
  maxKinEnergy = 100.0*CLHEP::TeV;
 
  // default lambda factor
  logLambdaFactor = G4Log(lambdaFactor);
 
  // particle types
  theGamma     = G4Gamma::Gamma();
  theElectron  = G4Electron::Electron();
  thePositron  = G4Positron::Positron();
 
  pParticleChange = &fParticleChange;
  fParticleChange.SetSecondaryWeightByProcess(true);
  secParticles.reserve(5);
 
  modelManager = new G4EmModelManager();
  lManager = G4LossTableManager::Instance();
  lManager->Register(this);
  G4LossTableBuilder* bld = lManager->GetTableBuilder();
  theDensityFactor = bld->GetDensityFactors();
  theDensityIdx = bld->GetCoupleIndexes();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4VEmProcess::~G4VEmProcess()
{
  /*
  if(1 < verboseLevel) {
    G4cout << "G4VEmProcess destruct " << GetProcessName() 
           << "  " << this << "  " <<  theLambdaTable <<G4endl;
  }
  */
  if(isTheMaster) {
    delete theData;
    delete theEnergyOfCrossSectionMax;
  }
  delete modelManager;
  delete biasManager;
  lManager->DeRegister(this);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::Clear()
{
  currentCouple = nullptr;
  preStepLambda = 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::MinPrimaryEnergy(const G4ParticleDefinition*,
                                        const G4Material*)
{
  return 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::AddEmModel(G4int order, G4VEmModel* ptr, 
                              const G4Region* region)
{
  if(nullptr == ptr) { return; }
  G4VEmFluctuationModel* fm = nullptr;
  modelManager->AddEmModel(order, ptr, fm, region);
  ptr->SetParticleChange(pParticleChange);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetEmModel(G4VEmModel* ptr, G4int) 
{
  if(nullptr == ptr) { return; }
  if(!emModels.empty()) {
    for(auto & em : emModels) { if(em == ptr) { return; } }
  }
  emModels.push_back(ptr);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4VEmModel* G4VEmProcess::GetModelByIndex(G4int idx, G4bool ver) const
{
  return modelManager->GetModel(idx, ver);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::PreparePhysicsTable(const G4ParticleDefinition& part)
{
  isTheMaster = lManager->IsMaster();
  if(nullptr == particle) { SetParticle(&part); }
 
  if(part.GetParticleType() == "nucleus" && 
     part.GetParticleSubType() == "generic") {
 
    G4String pname = part.GetParticleName();
    if(pname != "deuteron" && pname != "triton" &&
       pname != "alpha" && pname != "He3" &&
       pname != "alpha+"   && pname != "helium" &&
       pname != "hydrogen") {
 
      particle = G4GenericIon::GenericIon();
      isIon = true;
    }
  }
 
  if(1 < verboseLevel) {
    G4cout << "G4VEmProcess::PreparePhysicsTable() for "
           << GetProcessName()
           << " and particle " << part.GetParticleName()
           << " local particle " << particle->GetParticleName() 
           << G4endl;
  }
 
  if(particle != &part) { return; }
 
  lManager->PreparePhysicsTable(&part, this, isTheMaster);
 
  Clear();
  InitialiseProcess(particle);
 
  G4LossTableBuilder* bld = lManager->GetTableBuilder();
  const G4ProductionCutsTable* theCoupleTable=
    G4ProductionCutsTable::GetProductionCutsTable();
 
  // initialisation of the process  
  if(!actMinKinEnergy) { minKinEnergy = theParameters->MinKinEnergy(); }
  if(!actMaxKinEnergy) { maxKinEnergy = theParameters->MaxKinEnergy(); }
 
  if(isTheMaster) { 
    SetVerboseLevel(theParameters->Verbose());
    if(nullptr == theData) { theData = new G4EmDataHandler(2); }
    if(fEmOnePeak == fXSType) { 
      if(nullptr == theEnergyOfCrossSectionMax) {
        theEnergyOfCrossSectionMax = new std::vector<G4double>;
      }
      size_t n = theCoupleTable->GetTableSize();
      theEnergyOfCrossSectionMax->resize(n, DBL_MAX);
    }
  } else {  
    SetVerboseLevel(theParameters->WorkerVerbose()); 
  }
  applyCuts       = theParameters->ApplyCuts();
  lambdaFactor    = theParameters->LambdaFactor();
  logLambdaFactor = G4Log(lambdaFactor);
  theParameters->DefineRegParamForEM(this);
 
  // integral option may be disabled
  if(!theParameters->Integral()) { fXSType = fEmNoIntegral; }
 
  // prepare tables
  if(buildLambdaTable && isTheMaster){
    theLambdaTable = theData->MakeTable(0);
    bld->InitialiseBaseMaterials(theLambdaTable);
  }
  // high energy table
  if(isTheMaster && minKinEnergyPrim < maxKinEnergy){
    theLambdaTablePrim = theData->MakeTable(1);
    bld->InitialiseBaseMaterials(theLambdaTablePrim);
  }
  baseMat = bld->GetBaseMaterialFlag();
 
  // initialisation of models
  numberOfModels = modelManager->NumberOfModels();
  for(G4int i=0; i<numberOfModels; ++i) {
    G4VEmModel* mod = modelManager->GetModel(i);
    if(nullptr == mod) { continue; }
    if(nullptr == currentModel) { currentModel = mod; }
    mod->SetPolarAngleLimit(theParameters->MscThetaLimit());
    mod->SetMasterThread(isTheMaster);
    if(mod->HighEnergyLimit() > maxKinEnergy) {
      mod->SetHighEnergyLimit(maxKinEnergy);
    }
    SetEmModel(mod);
    mod->SetUseBaseMaterials(baseMat);
  }
 
  if(nullptr != lManager->AtomDeexcitation()) { 
    modelManager->SetFluoFlag(true); 
  }
  fLambdaEnergy = 0.0;
 
  theCuts = 
    modelManager->Initialise(particle,secondaryParticle,1.0,verboseLevel);
  theCutsGamma    = theCoupleTable->GetEnergyCutsVector(idxG4GammaCut);
  theCutsElectron = theCoupleTable->GetEnergyCutsVector(idxG4ElectronCut);
  theCutsPositron = theCoupleTable->GetEnergyCutsVector(idxG4PositronCut);
 
  // forced biasing
  if(biasManager) { 
    biasManager->Initialise(part,GetProcessName(),verboseLevel); 
    biasFlag = false;
  }
 
  // defined ID of secondary particles
  G4int stype = GetProcessSubType();
  if(stype == fAnnihilation) {
    secID = _Annihilation;
    tripletID = _TripletGamma;
  } else if(stype == fGammaConversion) {
    secID = _PairProduction;
    mainSecondaries = 2;
  } else if(stype == fPhotoElectricEffect) {
    secID = _PhotoElectron;
  } else if(stype == fComptonScattering) {
    secID = _ComptonElectron;
  } else if(stype >= fLowEnergyElastic) {
    secID = fDNAUnknownModel;
  }  
  if(1 < verboseLevel) {
    G4cout << "### G4VEmProcess::PreparePhysicsTable() done for " 
           << GetProcessName()
           << " and particle " << part.GetParticleName()
           << "  baseMat=" << baseMat << G4endl;
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::BuildPhysicsTable(const G4ParticleDefinition& part)
{
  if(nullptr == masterProc) {
    if(isTheMaster) { masterProc = this; }
    else { masterProc = static_cast<const G4VEmProcess*>(GetMasterProcess());}
  }
 
  G4String num = part.GetParticleName();
  if(1 < verboseLevel) {
    G4cout << "### G4VEmProcess::BuildPhysicsTable() for "
           << GetProcessName()
           << " and particle " << num
           << " buildLambdaTable= " << buildLambdaTable
           << " isTheMaster= " << isTheMaster 
           << "  " << masterProc 
           << G4endl;
  }
 
  if(particle == &part) { 
 
    // worker initialisation
    if(!isTheMaster) {
      theLambdaTable = masterProc->LambdaTable();
      theLambdaTablePrim = masterProc->LambdaTablePrim();
      if(fXSType == fEmOnePeak) {
    SetEnergyOfCrossSectionMax(masterProc->EnergyOfCrossSectionMax());
      }
      baseMat = masterProc->UseBaseMaterial();
 
      // local initialisation of models
      G4bool printing = true;
      for(G4int i=0; i<numberOfModels; ++i) {
        G4VEmModel* mod = GetModelByIndex(i, printing);
        G4VEmModel* mod0= masterProc->GetModelByIndex(i, printing);
        //G4cout << i << ".  " << mod << "   " << mod0 << "  " 
        //     << particle->GetParticleName() << G4endl;
        mod->SetUseBaseMaterials(baseMat);
        mod->InitialiseLocal(particle, mod0);
      }
    // master thread
    } else {
      if(buildLambdaTable || minKinEnergyPrim < maxKinEnergy) {
        BuildLambdaTable();
      }
      if(fXSType == fEmOnePeak) { 
    delete theEnergyOfCrossSectionMax;
    theEnergyOfCrossSectionMax = nullptr;
    SetEnergyOfCrossSectionMax(FindLambdaMax());
      }
    }
  }
  // protection against double printout
  if(theParameters->IsPrintLocked()) { return; }
 
  // explicitly defined printout by particle name
  if(1 < verboseLevel || 
     (0 < verboseLevel && (num == "gamma" || num == "e-" || 
                           num == "e+"    || num == "mu+" || 
                           num == "mu-"   || num == "proton"|| 
                           num == "pi+"   || num == "pi-" || 
                           num == "kaon+" || num == "kaon-" || 
                           num == "alpha" || num == "anti_proton" || 
                           num == "GenericIon"|| num == "alpha++" ||
                           num == "alpha+" || num == "helium" ||
                           num == "hydrogen")))
    { 
      StreamInfo(G4cout, part);
    }
 
  if(1 < verboseLevel) {
    G4cout << "### G4VEmProcess::BuildPhysicsTable() done for "
           << GetProcessName()
           << " and particle " << num
           << " baseMat=" << baseMat
           << G4endl;
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::BuildLambdaTable()
{
  if(1 < verboseLevel) {
    G4cout << "G4EmProcess::BuildLambdaTable() for process "
           << GetProcessName() << " and particle "
           << particle->GetParticleName() << "  " << this
           << G4endl;
  }
 
  // Access to materials
  const G4ProductionCutsTable* theCoupleTable=
        G4ProductionCutsTable::GetProductionCutsTable();
  size_t numOfCouples = theCoupleTable->GetTableSize();
 
  G4LossTableBuilder* bld = lManager->GetTableBuilder();
 
  G4PhysicsLogVector* aVector = nullptr;
  G4PhysicsLogVector* aVectorPrim = nullptr;
  G4PhysicsLogVector* bVectorPrim = nullptr;
 
  G4double scale = theParameters->MaxKinEnergy()/theParameters->MinKinEnergy();
  G4int nbin = 
    theParameters->NumberOfBinsPerDecade()*G4lrint(std::log10(scale));
  scale = G4Log(scale);
  if(actBinning) { nbin = std::max(nbin, nLambdaBins); }
  G4double emax1 = std::min(maxKinEnergy, minKinEnergyPrim);
    
  for(size_t i=0; i<numOfCouples; ++i) {
 
    if (bld->GetFlag(i)) {
 
      // create physics vector and fill it
      const G4MaterialCutsCouple* couple = 
        theCoupleTable->GetMaterialCutsCouple(i);
 
      // build main table
      if(buildLambdaTable) {
        delete (*theLambdaTable)[i];
 
        // if start from zero then change the scale
        G4double emin = minKinEnergy;
        G4bool startNull = false;
        if(startFromNull) {
          G4double e = MinPrimaryEnergy(particle,couple->GetMaterial());
          if(e >= emin) {
            emin = e;
            startNull = true;
          }
        }
        G4double emax = emax1;
        if(emax <= emin) { emax = 2*emin; }
        G4int bin = G4lrint(nbin*G4Log(emax/emin)/scale);
        if(bin < 3) { bin = 3; }
        aVector = new G4PhysicsLogVector(emin, emax, bin, splineFlag);
        modelManager->FillLambdaVector(aVector, couple, startNull);
        if(splineFlag) { aVector->FillSecondDerivatives(); }
        G4PhysicsTableHelper::SetPhysicsVector(theLambdaTable, i, aVector);
      }
      // build high energy table
      if(minKinEnergyPrim < maxKinEnergy) { 
        delete (*theLambdaTablePrim)[i];
 
        // start not from zero and always use spline
        if(!bVectorPrim) {
          G4int bin = G4lrint(nbin*G4Log(maxKinEnergy/minKinEnergyPrim)/scale);
          if(bin < 3) { bin = 3; }
          aVectorPrim = 
            new G4PhysicsLogVector(minKinEnergyPrim, maxKinEnergy, bin, true);
          bVectorPrim = aVectorPrim;
        } else {
          aVectorPrim = new G4PhysicsLogVector(*bVectorPrim);
        }
        modelManager->FillLambdaVector(aVectorPrim, couple, false, 
                                       fIsCrossSectionPrim);
        aVectorPrim->FillSecondDerivatives();
        G4PhysicsTableHelper::SetPhysicsVector(theLambdaTablePrim, i, 
                                               aVectorPrim);
      }
    }
  }
 
  if(1 < verboseLevel) {
    G4cout << "Lambda table is built for "
           << particle->GetParticleName()
           << G4endl;
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::StreamInfo(std::ostream& out, 
                  const G4ParticleDefinition& part, G4bool rst) const
{
  G4String indent = (rst ? "  " : "");
  out << std::setprecision(6);
  out << G4endl << indent << GetProcessName() << ": ";
  if (!rst) {
    out << " for " << part.GetParticleName();
  }
  if(fXSType != fEmNoIntegral)  { out << " XStype:" << fXSType; }
  if(applyCuts) { out << " applyCuts:1 "; }
  out << " SubType=" << GetProcessSubType();
  if(biasFactor != 1.0) { out << "  BiasingFactor= " << biasFactor; }
  out << " BuildTable=" << buildLambdaTable << G4endl;
  if(buildLambdaTable) {
    if(particle == &part) { 
      size_t length = theLambdaTable->length();
      for(size_t i=0; i<length; ++i) {
        G4PhysicsVector* v = (*theLambdaTable)[i];
        if(v) {
          out << "      Lambda table from ";
          G4double emin = v->Energy(0);
          G4double emax = v->GetMaxEnergy();
          G4int nbin = v->GetVectorLength() - 1;
          if(emin > minKinEnergy) { out << "threshold "; }
          else { out << G4BestUnit(emin,"Energy"); } 
          out << " to "
              << G4BestUnit(emax,"Energy")
              << ", " << G4lrint(nbin/std::log10(emax/emin))
              << " bins/decade, spline: " 
              << splineFlag << G4endl;
          break;
        }
      }
    } else {
      out << "      Used Lambda table of " 
      << particle->GetParticleName() << G4endl;
    }
  }
  if(minKinEnergyPrim < maxKinEnergy) {
    if(particle == &part) { 
      size_t length = theLambdaTablePrim->length();
      for(size_t i=0; i<length; ++i) {
        G4PhysicsVector* v = (*theLambdaTablePrim)[i];
        if(v) { 
          out << "      LambdaPrime table from "
              << G4BestUnit(v->Energy(0),"Energy") 
              << " to "
              << G4BestUnit(v->GetMaxEnergy(),"Energy")
              << " in " << v->GetVectorLength()-1
              << " bins " << G4endl;
          break;
        }
      }
    } else {
      out << "      Used LambdaPrime table of " 
               << particle->GetParticleName() << G4endl;
    }
  }
  StreamProcessInfo(out);
  modelManager->DumpModelList(out, verboseLevel);
 
  if(verboseLevel > 2 && buildLambdaTable) {
    out << "      LambdaTable address= " << theLambdaTable << G4endl;
    if(theLambdaTable && particle == &part) { 
      out << (*theLambdaTable) << G4endl;
    }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::StartTracking(G4Track* track)
{
  // reset parameters for the new track
  currentParticle = track->GetParticleDefinition();
  theNumberOfInteractionLengthLeft = -1.0;
  mfpKinEnergy = DBL_MAX;
 
  if(isIon) { massRatio = proton_mass_c2/currentParticle->GetPDGMass(); }
 
  // forced biasing only for primary particles
  if(biasManager) {
    if(0 == track->GetParentID()) {
      // primary particle
      biasFlag = true; 
      biasManager->ResetForcedInteraction(); 
    }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::PostStepGetPhysicalInteractionLength(
                             const G4Track& track,
                             G4double   previousStepSize,
                             G4ForceCondition* condition)
{
  *condition = NotForced;
  G4double x = DBL_MAX;
 
  DefineMaterial(track.GetMaterialCutsCouple());
  preStepKinEnergy    = track.GetKineticEnergy();
  preStepLogKinEnergy = track.GetDynamicParticle()->GetLogKineticEnergy();
  const G4double scaledEnergy = preStepKinEnergy*massRatio;
  SelectModel(scaledEnergy, currentCoupleIndex);
  /*
  G4cout << "PostStepGetPhysicalInteractionLength: idx= " << currentCoupleIndex
         << "  couple: " << currentCouple << G4endl;
  */
  if(!currentModel->IsActive(scaledEnergy)) { 
    theNumberOfInteractionLengthLeft = -1.0;
    currentInteractionLength = DBL_MAX;
    return x; 
  }
 
  // forced biasing only for primary particles
  if(biasManager) {
    if(0 == track.GetParentID()) {
      if(biasFlag && 
         biasManager->ForcedInteractionRegion(currentCoupleIndex)) {
        return biasManager->GetStepLimit(currentCoupleIndex, previousStepSize);
      }
    }
  }
 
  // compute mean free path
  ComputeIntegralLambda(preStepKinEnergy, preStepLogKinEnergy);
 
  // zero cross section
  if(preStepLambda <= 0.0) { 
    theNumberOfInteractionLengthLeft = -1.0;
    currentInteractionLength = DBL_MAX;
 
  } else {
 
    // non-zero cross section
    if (theNumberOfInteractionLengthLeft < 0.0) {
 
      // beggining of tracking (or just after DoIt of this process)
      theNumberOfInteractionLengthLeft = -G4Log( G4UniformRand() );
      theInitialNumberOfInteractionLength = theNumberOfInteractionLengthLeft; 
 
    } else if(currentInteractionLength < DBL_MAX) {
 
      theNumberOfInteractionLengthLeft -= 
        previousStepSize/currentInteractionLength;
      theNumberOfInteractionLengthLeft = 
        std::max(theNumberOfInteractionLengthLeft, 0.0);
    }
 
    // new mean free path and step limit for the next step
    currentInteractionLength = 1.0/preStepLambda;
    x = theNumberOfInteractionLengthLeft * currentInteractionLength;
  }
  return x;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::ComputeIntegralLambda(G4double e, G4double loge)
{
  if(fXSType == fEmNoIntegral) {
    preStepLambda = GetCurrentLambda(e, loge);
 
  } else if(fXSType == fEmIncreasing) {
    if(e/lambdaFactor < mfpKinEnergy) {
      mfpKinEnergy = e;
      preStepLambda = GetCurrentLambda(e, loge); 
    }
 
  } else if(fXSType == fEmDecreasing) {
    if(e < mfpKinEnergy) { 
      const G4double e1 = e*lambdaFactor;
      preStepLambda = GetCurrentLambda(e1); 
      mfpKinEnergy = e1;
    }
 
  } else if(fXSType == fEmOnePeak) {
    const G4double epeak = (*theEnergyOfCrossSectionMax)[currentCoupleIndex];
    if(e <= epeak) {
      if(e/lambdaFactor < mfpKinEnergy) {
        mfpKinEnergy = e;
        preStepLambda = GetCurrentLambda(e, loge); 
      }
    } else if(e < mfpKinEnergy) { 
      const G4double e1 = std::max(epeak, e*lambdaFactor);
      preStepLambda = GetCurrentLambda(e1); 
      mfpKinEnergy = e1;
    }
 
  } else {
    preStepLambda = GetCurrentLambda(e, loge); 
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4VParticleChange* G4VEmProcess::PostStepDoIt(const G4Track& track,
                                              const G4Step& step)
{
  // In all cases clear number of interaction lengths
  theNumberOfInteractionLengthLeft = -1.0;
  mfpKinEnergy = DBL_MAX;
 
  fParticleChange.InitializeForPostStep(track);
 
  // Do not make anything if particle is stopped, the annihilation then
  // should be performed by the AtRestDoIt!
  if (track.GetTrackStatus() == fStopButAlive) { return &fParticleChange; }
 
  const G4double finalT    = track.GetKineticEnergy();
 
  // forced process - should happen only once per track
  if(biasFlag) {
    if(biasManager->ForcedInteractionRegion(currentCoupleIndex)) {
      biasFlag = false;
    }
  }
 
  // check active and select model
  const G4double scaledEnergy = finalT*massRatio;
  SelectModel(scaledEnergy, currentCoupleIndex);
  if(!currentModel->IsActive(scaledEnergy)) { return &fParticleChange; }
 
  // Integral approach
  if (fXSType != fEmNoIntegral) {
    const G4double logFinalT = track.GetDynamicParticle()->GetLogKineticEnergy();
    const G4double lx = std::max(GetCurrentLambda(finalT, logFinalT), 0.0);
    const G4double lg = preStepLambda;
    if(finalT < mfpKinEnergy) {
      mfpKinEnergy = finalT;
      preStepLambda = lx;
    }
#ifdef G4VERBOSE
    if(lg < lx && 1 < verboseLevel) {
      G4cout << "WARNING: for " << currentParticle->GetParticleName() 
             << " and " << GetProcessName()
             << " E(MeV)= " << finalT/MeV
             << " preLambda= " << lg << " < " << lx << " (postLambda) "
             << G4endl;  
    }
#endif
    if(lg*G4UniformRand() >= lx) {
      return &fParticleChange;
    }
  }
 
  // define new weight for primary and secondaries
  G4double weight = fParticleChange.GetParentWeight();
  if(weightFlag) { 
    weight /= biasFactor; 
    fParticleChange.ProposeWeight(weight);
  }
  
#ifdef G4VERBOSE
  if(1 < verboseLevel) {
    G4cout << "G4VEmProcess::PostStepDoIt: Sample secondary; E= "
           << finalT/MeV
           << " MeV; model= (" << currentModel->LowEnergyLimit()
           << ", " <<  currentModel->HighEnergyLimit() << ")"
           << G4endl;
  }
#endif
 
  // sample secondaries
  secParticles.clear();
  currentModel->SampleSecondaries(&secParticles, 
                                  currentCouple, 
                                  track.GetDynamicParticle(),
                                  (*theCuts)[currentCoupleIndex]);
 
  G4int num0 = secParticles.size();
 
  // splitting or Russian roulette
  if(biasManager) {
    if(biasManager->SecondaryBiasingRegion(currentCoupleIndex)) {
      G4double eloss = 0.0;
      weight *= biasManager->ApplySecondaryBiasing(
        secParticles, track, currentModel, &fParticleChange, eloss, 
        currentCoupleIndex, (*theCuts)[currentCoupleIndex],
        step.GetPostStepPoint()->GetSafety());
      if(eloss > 0.0) {
        eloss += fParticleChange.GetLocalEnergyDeposit();
        fParticleChange.ProposeLocalEnergyDeposit(eloss);
      }
    }
  }
 
  // save secondaries
  G4int num = secParticles.size();
  if(num > 0) {
 
    fParticleChange.SetNumberOfSecondaries(num);
    G4double edep = fParticleChange.GetLocalEnergyDeposit();
    G4double time = track.GetGlobalTime();
 
    G4int n1(0), n2(0);
    if(num > mainSecondaries) { 
      currentModel->FillNumberOfSecondaries(n1, n2);
    }
     
    for (G4int i=0; i<num; ++i) {
      G4DynamicParticle* dp = secParticles[i];
      if (nullptr != dp) {
        const G4ParticleDefinition* p = dp->GetParticleDefinition();
        G4double e = dp->GetKineticEnergy();
        G4bool good = true;
        if(applyCuts) {
          if (p == theGamma) {
            if (e < (*theCutsGamma)[currentCoupleIndex]) { good = false; }
 
          } else if (p == theElectron) {
            if (e < (*theCutsElectron)[currentCoupleIndex]) { good = false; }
 
          } else if (p == thePositron) {
            if (electron_mass_c2 < (*theCutsGamma)[currentCoupleIndex] &&
                e < (*theCutsPositron)[currentCoupleIndex]) {
              good = false;
              e += 2.0*electron_mass_c2;
            }
          }
          // added secondary if it is good
        }
        if (good) { 
          G4Track* t = new G4Track(dp, time, track.GetPosition());
          t->SetTouchableHandle(track.GetTouchableHandle());
          if (biasManager) {
            t->SetWeight(weight * biasManager->GetWeight(i));
          } else {
            t->SetWeight(weight);
          }
          pParticleChange->AddSecondary(t);
 
          // define type of secondary
          if(i < mainSecondaries) { 
            t->SetCreatorModelID(secID);
            if(GetProcessSubType() == fComptonScattering && p == theGamma) {
              t->SetCreatorModelID(_ComptonGamma);
            }
          } else if(i < mainSecondaries + n1) {
            t->SetCreatorModelID(tripletID);
          } else if(i < mainSecondaries + n1 + n2) {
            t->SetCreatorModelID(_IonRecoil);
          } else {
            if(i < num0) {
              if(p == theGamma) { 
                t->SetCreatorModelID(fluoID);
              } else {
                t->SetCreatorModelID(augerID);
              }
            } else {
              t->SetCreatorModelID(secID);
            }
          }
          /* 
          G4cout << "Secondary(post step) has weight " << t->GetWeight() 
                 << ", Ekin= " << t->GetKineticEnergy()/MeV << " MeV "
                 << GetProcessName() << " fluoID= " << fluoID
                 << " augerID= " << augerID <<G4endl;
          */
        } else {
          delete dp;
          edep += e;
        }
      } 
    }
    fParticleChange.ProposeLocalEnergyDeposit(edep);
  }
 
  if(0.0 == fParticleChange.GetProposedKineticEnergy() &&
     fAlive == fParticleChange.GetTrackStatus()) {
    if(particle->GetProcessManager()->GetAtRestProcessVector()->size() > 0)
         { fParticleChange.ProposeTrackStatus(fStopButAlive); }
    else { fParticleChange.ProposeTrackStatus(fStopAndKill); }
  }
 
  return &fParticleChange;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4bool G4VEmProcess::StorePhysicsTable(const G4ParticleDefinition* part,
                                       const G4String& directory,
                                       G4bool ascii)
{
  G4bool yes = true;
  if(!isTheMaster) { return yes; }
 
  if ( theLambdaTable && part == particle) {
    const G4String& nam = 
      GetPhysicsTableFileName(part,directory,"Lambda",ascii);
    yes = theLambdaTable->StorePhysicsTable(nam,ascii);
 
    if ( yes ) {
      if(0 < verboseLevel) G4cout << "Stored: " << nam << G4endl;
    } else {
      G4cout << "Fail to store Physics Table for " 
             << particle->GetParticleName()
             << " and process " << GetProcessName()
             << " in the directory <" << directory
             << "> " << G4endl;
    }
  }
  if ( theLambdaTablePrim && part == particle) {
    const G4String& name = 
      GetPhysicsTableFileName(part,directory,"LambdaPrim",ascii);
    yes = theLambdaTablePrim->StorePhysicsTable(name,ascii);
 
    if ( yes ) {
      if(0 < verboseLevel) {
        G4cout << "Physics table prim is stored for " 
               << particle->GetParticleName()
               << " and process " << GetProcessName()
               << " in the directory <" << directory
               << "> " << G4endl;
      }
    } else {
      G4cout << "Fail to store Physics Table Prim for " 
             << particle->GetParticleName()
             << " and process " << GetProcessName()
             << " in the directory <" << directory
             << "> " << G4endl;
    }
  }
  return yes;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.....
 
G4bool G4VEmProcess::RetrievePhysicsTable(const G4ParticleDefinition* part,
                                          const G4String& directory,
                                          G4bool ascii)
{
  if(1 < verboseLevel) {
    G4cout << "G4VEmProcess::RetrievePhysicsTable() for "
           << part->GetParticleName() << " and process "
           << GetProcessName() << G4endl;
  }
  G4bool yes = true;
 
  if((!buildLambdaTable && minKinEnergyPrim > maxKinEnergy) 
     || particle != part) { return yes; }
 
  const G4String particleName = part->GetParticleName();
 
  if(buildLambdaTable) {
    const G4String& filename = 
      GetPhysicsTableFileName(part,directory,"Lambda",ascii);
    yes = G4PhysicsTableHelper::RetrievePhysicsTable(theLambdaTable,
                                                     filename,ascii,
                                                     splineFlag);
    if ( yes ) {
      if (0 < verboseLevel) {
        G4cout << "Lambda table for " << particleName 
               << " is Retrieved from <"
               << filename << ">"
               << G4endl;
      }
      if(splineFlag) {
        for(auto & v : *theLambdaTable) {
          if(nullptr != v) { v->FillSecondDerivatives(); }
        }
      }
 
    } else {
      if (1 < verboseLevel) {
        G4cout << "Lambda table for " << particleName << " in file <"
               << filename << "> is not exist"
               << G4endl;
      }
    }
  }
  if(minKinEnergyPrim < maxKinEnergy) {
    const G4String& filename = 
      GetPhysicsTableFileName(part,directory,"LambdaPrim",ascii);
    yes = G4PhysicsTableHelper::RetrievePhysicsTable(theLambdaTablePrim,
                                                     filename,ascii,true);
    if ( yes ) {
      if (0 < verboseLevel) {
        G4cout << "Lambda table prim for " << particleName 
               << " is Retrieved from <"
               << filename << ">"
               << G4endl;
      }
      for(auto & v : *theLambdaTablePrim) {
        if(nullptr != v) { v->FillSecondDerivatives(); }
      }
    } else {
      if (1 < verboseLevel) {
        G4cout << "Lambda table prim for " << particleName << " in file <"
               << filename << "> is not exist"
               << G4endl;
      }
    }
  }
  return yes;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::CrossSectionPerVolume(G4double kinEnergy,
                                       const G4MaterialCutsCouple* couple,
                                             G4double)
{
  G4double cross = RecalculateLambda(kinEnergy, couple);
  return std::max(cross, 0.0);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::GetMeanFreePath(const G4Track& track,
                                       G4double,
                                       G4ForceCondition* condition)
{
  *condition = NotForced;
  return G4VEmProcess::MeanFreePath(track);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::MeanFreePath(const G4Track& track)
{
  const G4double kinEnergy = track.GetKineticEnergy();
  CurrentSetup(track.GetMaterialCutsCouple(), kinEnergy);
  const G4double xs = GetCurrentLambda(kinEnergy,
                             track.GetDynamicParticle()->GetLogKineticEnergy());
  return (0.0 < xs) ? 1.0/xs : DBL_MAX; 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double 
G4VEmProcess::ComputeCrossSectionPerAtom(G4double kinEnergy, 
                                         G4double Z, G4double A, G4double cut)
{
  SelectModel(kinEnergy, currentCoupleIndex);
  return (currentModel) ? 
    currentModel->ComputeCrossSectionPerAtom(currentParticle, kinEnergy,
                                             Z, A, cut) : 0.0;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
std::vector<G4double>* G4VEmProcess::FindLambdaMax()
{
  if(1 < verboseLevel) {
    G4cout << "### G4VEmProcess::FindLambdaMax: " 
           << particle->GetParticleName() 
           << " and process " << GetProcessName() << "  " << G4endl; 
  }
  std::vector<G4double>* ptr = nullptr;
  if(fXSType != fEmOnePeak) { return ptr; }
 
  const G4ProductionCutsTable* theCoupleTable=
        G4ProductionCutsTable::GetProductionCutsTable();
  size_t n = theCoupleTable->GetTableSize();
  ptr = new std::vector<G4double>;
  ptr->resize(n, DBL_MAX);
 
  G4bool isPeak = false;
  const G4double g4log10 = G4Log(10.);
  const G4double scale = theParameters->NumberOfBinsPerDecade()/g4log10;
 
  for(size_t i=0; i<n; ++i) {
    const G4MaterialCutsCouple* couple = theCoupleTable->GetMaterialCutsCouple(i);
    G4double emin = std::max(minKinEnergy, MinPrimaryEnergy(particle, couple->GetMaterial()));
    G4double emax = std::max(maxKinEnergy, emin + emin);
    G4double ee = G4Log(emax/emin);
    G4int nbin = G4lrint(ee*scale);
    if(nbin < 4) { nbin = 4; }
    G4double x = G4Exp(ee/nbin);
    G4double sm = 0.0;
    G4double em = emin;
    G4double e = emin;
    for(G4int j=0; j<=nbin; ++j) {
      G4double sig = RecalculateLambda(e, couple);
      //G4cout << j << "  E=" << e << " Lambda=" << sig << G4endl;
      if(sig >= sm) {
    em = e;
    sm = sig;
    e *= x;
      } else {
    isPeak = true;
    (*ptr)[i] = em;
    break;
      }
    }
    if(1 < verboseLevel) {
      G4cout << "  " << i << ".  Epeak(GeV)=" << em/GeV
         << " SigmaMax(1/mm)=" << sm
         << " Emin(GeV)=" << emin/GeV << " Emax(GeV)=" << emax/GeV
         << "   " << couple->GetMaterial()->GetName() << G4endl;
    }
  }
  // there is no peak for any material
  if(!isPeak) {
    delete ptr;
    ptr = nullptr;
  }
  return ptr;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetEnergyOfCrossSectionMax(std::vector<G4double>* ptr)
{
  if(nullptr == ptr) {
    fXSType = fEmIncreasing;
  } else {
    theEnergyOfCrossSectionMax = ptr;
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4PhysicsVector* 
G4VEmProcess::LambdaPhysicsVector(const G4MaterialCutsCouple* couple)
{
  DefineMaterial(couple);
  G4PhysicsVector* newv = new G4PhysicsLogVector(minKinEnergy, maxKinEnergy, 
                                                 nLambdaBins, splineFlag);
  return newv;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
const G4Element* G4VEmProcess::GetCurrentElement() const
{
  return (nullptr != currentModel) ? currentModel->GetCurrentElement() : nullptr; 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetCrossSectionBiasingFactor(G4double f, G4bool flag)
{
  if(f > 0.0) { 
    biasFactor = f; 
    weightFlag = flag;
    if(1 < verboseLevel) {
      G4cout << "### SetCrossSectionBiasingFactor: for " 
             << particle->GetParticleName() 
             << " and process " << GetProcessName()
             << " biasFactor= " << f << " weightFlag= " << flag 
             << G4endl; 
    }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void 
G4VEmProcess::ActivateForcedInteraction(G4double length, const G4String& r,
                                        G4bool flag)
{
  if(nullptr == biasManager) { biasManager = new G4EmBiasingManager(); }
  if(1 < verboseLevel) {
    G4cout << "### ActivateForcedInteraction: for " 
           << particle->GetParticleName() 
           << " and process " << GetProcessName()
           << " length(mm)= " << length/mm
           << " in G4Region <" << r 
           << "> weightFlag= " << flag 
           << G4endl; 
  }
  weightFlag = flag;
  biasManager->ActivateForcedInteraction(length, r);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void
G4VEmProcess::ActivateSecondaryBiasing(const G4String& region,
                 G4double factor,
                 G4double energyLimit)
{
  if (0.0 <= factor) {
 
    // Range cut can be applied only for e-
    if(0.0 == factor && secondaryParticle != G4Electron::Electron())
      { return; }
 
    if(!biasManager) { biasManager = new G4EmBiasingManager(); }
    biasManager->ActivateSecondaryBiasing(region, factor, energyLimit);
    if(1 < verboseLevel) {
      G4cout << "### ActivateSecondaryBiasing: for "
       << " process " << GetProcessName()
       << " factor= " << factor
       << " in G4Region <" << region
       << "> energyLimit(MeV)= " << energyLimit/MeV
       << G4endl;
    }
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetLambdaBinning(G4int n)
{
  if(5 < n && n < 10000000) {  
    nLambdaBins = n; 
    actBinning = true;
  } else { 
    G4double e = (G4double)n;
    PrintWarning("SetLambdaBinning", e); 
  } 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetMinKinEnergy(G4double e)
{
  if(1.e-3*eV < e && e < maxKinEnergy) { 
    nLambdaBins = G4lrint(nLambdaBins*G4Log(maxKinEnergy/e)
                          /G4Log(maxKinEnergy/minKinEnergy));
    minKinEnergy = e;
    actMinKinEnergy = true;
  } else { PrintWarning("SetMinKinEnergy", e); } 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetMaxKinEnergy(G4double e)
{
  if(minKinEnergy < e && e < 1.e+6*TeV) { 
    nLambdaBins = G4lrint(nLambdaBins*G4Log(e/minKinEnergy)
                          /G4Log(maxKinEnergy/minKinEnergy));
    maxKinEnergy = e;
    actMaxKinEnergy = true;
  } else { PrintWarning("SetMaxKinEnergy", e); } 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::SetMinKinEnergyPrim(G4double e)
{
  if(theParameters->MinKinEnergy() <= e && 
     e <= theParameters->MaxKinEnergy()) { minKinEnergyPrim = e; } 
  else { PrintWarning("SetMinKinEnergyPrim", e); } 
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4VEmProcess* G4VEmProcess::GetEmProcess(const G4String& nam)
{
  return (nam == GetProcessName()) ? this : nullptr;
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double 
G4VEmProcess::GetLambda(G4double kinEnergy, const G4MaterialCutsCouple* couple)
{
  CurrentSetup(couple, kinEnergy);
  return GetCurrentLambda(kinEnergy, G4Log(kinEnergy));
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
G4double G4VEmProcess::PolarAngleLimit() const
{
  return theParameters->MscThetaLimit();
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::PrintWarning(G4String tit, G4double val)
{
  G4String ss = "G4VEmProcess::" + tit;
  G4ExceptionDescription ed;
  ed << "Parameter is out of range: " << val 
     << " it will have no effect!\n" << "  Process " 
     << GetProcessName() << "  nbins= " << theParameters->NumberOfBins()
     << " Emin(keV)= " << theParameters->MinKinEnergy()/keV 
     << " Emax(GeV)= " << theParameters->MaxKinEnergy()/GeV;
  G4Exception(ss, "em0044", JustWarning, ed);
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
 
void G4VEmProcess::ProcessDescription(std::ostream& out) const
{
  if(particle) {
    StreamInfo(out, *particle, true);
  }
}
 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....