G4DNAMolecularDissociation.cc

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//
// Author: Mathieu Karamitros (kara (AT) cenbg . in2p3 . fr) 
//
// WARNING : This class is released as a prototype.
// It might strongly evolve or even disapear in the next releases.
//
// History:
// -----------
// 10 Oct 2011 M.Karamitros created
//
// -------------------------------------------------------------------
 
#include "G4DNAMolecularDissociation.hh"
#include "G4VITRestDiscreteProcess.hh"
#include "G4SystemOfUnits.hh"
#include "G4Track.hh"
#include "G4Molecule.hh"
#include "G4ParticleChange.hh"
#include "G4ITTransportationManager.hh"
#include "G4ITNavigator.hh"
#include "G4LowEnergyEmProcessSubType.hh"
 
//______________________________________________________________________________
 
G4DNAMolecularDissociation::
G4DNAMolecularDissociation(const G4String& processName,
                           G4ProcessType type)
   : G4VITRestDiscreteProcess(processName, type)
{
    // set Process Sub Type
    SetProcessSubType(fLowEnergyMolecularDecay); // DNA sub-type
    enableAlongStepDoIt = false;
    enablePostStepDoIt = true;
    enableAtRestDoIt = true;
 
    fVerbose = 0;
 
#ifdef G4VERBOSE
    if (verboseLevel > 1)
    {
        G4cout << "G4MolecularDissociationProcess constructor " << "  Name:"
               << processName << G4endl;
    }
#endif
 
    pParticleChange = &aParticleChange;
 
    fDecayAtFixedTime = true;
    fProposesTimeStep = true;
}
 
//______________________________________________________________________________
 
G4DNAMolecularDissociation::~G4DNAMolecularDissociation() = default;
 
//______________________________________________________________________________
 
G4bool G4DNAMolecularDissociation::
IsApplicable(const G4ParticleDefinition& aParticleType)
{
    if (aParticleType.GetParticleType() == "Molecule")
    {
#ifdef G4VERBOSE
 
        if (fVerbose > 1)
        {
            G4cout << "G4MolecularDissociation::IsApplicable(";
            G4cout << aParticleType.GetParticleName() << ",";
            G4cout << aParticleType.GetParticleType() << ")" << G4endl;
        }
#endif
        return (true);
    }
    else
    {
        return false;
    }
}
 
//______________________________________________________________________________
 
G4double G4DNAMolecularDissociation::GetMeanLifeTime(const G4Track& track,
                                                     G4ForceCondition*)
{
    G4double output = GetMolecule(track)->GetDecayTime() - track.GetProperTime();
    return output > 0. ? output : 0.;
}
 
//______________________________________________________________________________
 
G4VParticleChange* G4DNAMolecularDissociation::DecayIt(const G4Track& track,
                                                       const G4Step&)
{
    aParticleChange.Initialize(track);
    auto pMotherMolecule = GetMolecule(track);
    auto pMotherMoleculeDefinition = pMotherMolecule->GetDefinition();
 
    if (pMotherMoleculeDefinition->GetDecayTable())
    {
        const auto pDissociationChannels = pMotherMolecule->GetDissociationChannels();
 
        if (pDissociationChannels == nullptr)
        {
            G4ExceptionDescription exceptionDescription;
            pMotherMolecule->PrintState();
            exceptionDescription << "No decay channel was found for the molecule : "
                                 << pMotherMolecule->GetName() << G4endl;
            G4Exception("G4DNAMolecularDissociation::DecayIt",
                        "G4DNAMolecularDissociation::NoDecayChannel",
                        FatalException,
                        exceptionDescription);
            return &aParticleChange;
        }
 
        auto decayVectorSize = pDissociationChannels->size();
        G4double RdmValue = G4UniformRand();
 
        const G4MolecularDissociationChannel* pDecayChannel = nullptr;
        size_t i = 0;
        do
        {
            pDecayChannel = (*pDissociationChannels)[i];
            if (RdmValue < pDecayChannel->GetProbability())
            {
                break;
            }
            RdmValue -= pDecayChannel->GetProbability();
            i++;
        } while (i < decayVectorSize);
 
        G4double decayEnergy = pDecayChannel->GetEnergy();
        auto nbProducts = pDecayChannel->GetNbProducts();
 
        if (decayEnergy > 0.)
        {
            aParticleChange.ProposeLocalEnergyDeposit(pDecayChannel->GetEnergy());
        }
 
        if (nbProducts)
        {
            std::vector<G4ThreeVector> productsDisplacement(nbProducts);
            G4ThreeVector motherMoleculeDisplacement;
 
            auto it = fDisplacementMap.find(pMotherMoleculeDefinition);
 
            if (it != fDisplacementMap.end())
            {
                auto pDisplacer = it->second.get();
                productsDisplacement = pDisplacer->GetProductsDisplacement(pDecayChannel);
                motherMoleculeDisplacement =
                        pDisplacer->GetMotherMoleculeDisplacement(pDecayChannel);
            }
            else
            {
                G4ExceptionDescription errMsg;
                errMsg << "No G4MolecularDecayProcess::theDecayDisplacementMap["
                       << pMotherMolecule->GetName() + "]";
                G4Exception("G4MolecularDecayProcess::DecayIt",
                            "DNAMolecularDecay001",
                            FatalErrorInArgument,
                            errMsg);
            }
 
            aParticleChange.SetNumberOfSecondaries(nbProducts);
 
#ifdef G4VERBOSE
            if (fVerbose)
            {
                G4cout << "Decay Process : " << pMotherMolecule->GetName()
                       << " (trackID :" << track.GetTrackID() << ") "
                       << pDecayChannel->GetName() << G4endl;
            }
#endif
 
            auto pNavigator = G4ITTransportationManager::GetTransportationManager()->GetNavigatorForTracking();
 
            for (G4int j = 0; j < nbProducts; j++)
            {
                auto pProduct = new G4Molecule(pDecayChannel->GetProduct(j));
 
                G4ThreeVector displacement = motherMoleculeDisplacement + productsDisplacement[j];
                double mag_displacement = displacement.mag();
                G4ThreeVector displacement_direction = displacement / (mag_displacement + 1e-30);
 
                double prNewSafety = DBL_MAX;
 
                //double step =
                pNavigator->CheckNextStep(track.GetPosition(),
                                         displacement_direction,
                                         mag_displacement,
                                         prNewSafety);
 
                //if(prNewSafety < mag_displacement || step < mag_displacement)
                mag_displacement = std::min(prNewSafety * 0.8, mag_displacement);
 
                G4ThreeVector product_pos = track.GetPosition()
                                            + displacement_direction * mag_displacement;
 
                const G4AffineTransform& transform = pNavigator->GetGlobalToLocalTransform();
 
                G4ThreeVector localPoint = transform.TransformPoint(product_pos); //track.GetPosition());
 
                if (track.GetTouchable()->GetSolid()->Inside(localPoint) !=
                    EInside::kInside)
                {
                    G4ExceptionDescription ED;
                    ED << "The decayed product is outside of the volume : "
                       << track.GetTouchable()->GetVolume()->GetName() << G4endl;
                    G4Exception("G4DNAMolecularDissociation::DecayIt()",
                                "OUTSIDE_OF_MOTHER_VOLUME",
                                JustWarning, ED);
                }
 
                auto pSecondary = pProduct->BuildTrack(track.GetGlobalTime(), product_pos);
 
                pSecondary->SetTrackStatus(fAlive);
#ifdef G4VERBOSE
                if (fVerbose)
                {
                    G4cout << "Product : " << pProduct->GetName() << G4endl;
                }
#endif
                // add the secondary track in the List
                aParticleChange.G4VParticleChange::AddSecondary(pSecondary);
            }
#ifdef G4VERBOSE
            if (fVerbose)
            {
                G4cout << "-------------" << G4endl;
            }
#endif
        }
            //DEBUG
        else if (fVerbose && decayEnergy)
        {
            G4cout << "No products for this channel" << G4endl;
            G4cout << "-------------" << G4endl;
        }
        /*
         else if(!decayEnergy && !nbProducts)
         {
         G4ExceptionDescription errMsg;
         errMsg << "There is no products and no energy specified in the molecular "
         "dissociation channel";
         G4Exception("G4MolecularDissociationProcess::DecayIt",
         "DNAMolecularDissociation002",
         FatalErrorInArgument,
         errMsg);
         }
         */
    }
 
    aParticleChange.ProposeTrackStatus(fStopAndKill);
 
    return &aParticleChange;
}
 
//______________________________________________________________________________
 
void G4DNAMolecularDissociation::SetDisplacer(Species* pSpecies, Displacer* pDisplacer)
{
    fDisplacementMap.emplace(pSpecies, std::unique_ptr<Displacer>(pDisplacer));
}
 
//______________________________________________________________________________
 
G4DNAMolecularDissociation::Displacer* G4DNAMolecularDissociation::GetDisplacer(Species* pSpecies)
{
    return fDisplacementMap[pSpecies].get();
}
 
//______________________________________________________________________________
 
G4double G4DNAMolecularDissociation::PostStepGetPhysicalInteractionLength(const G4Track&,
                                                                          G4double,
                                                                          G4ForceCondition*)
{
    return 0; //-1*(-log(1-G4UniformRand())*100*1e-15*s);
}
 
//______________________________________________________________________________
 
void G4DNAMolecularDissociation::SetVerbose(G4int verbose)
{
    fVerbose = verbose;
}
 
//______________________________________________________________________________
 
G4VParticleChange* G4DNAMolecularDissociation::AtRestDoIt(const G4Track& track,
                                                          const G4Step& step)
{
    ClearNumberOfInteractionLengthLeft();
    ClearInteractionTimeLeft();
    return DecayIt(track, step);
}
 
//______________________________________________________________________________
 
G4double G4DNAMolecularDissociation::AtRestGetPhysicalInteractionLength(const G4Track& track,
                                                                        G4ForceCondition* condition)
{
    if (fDecayAtFixedTime)
    {
        return GetMeanLifeTime(track, condition);
    }
 
    return G4VITRestDiscreteProcess::AtRestGetPhysicalInteractionLength(track, condition);
}
 
//______________________________________________________________________________
 
G4VParticleChange* G4DNAMolecularDissociation::PostStepDoIt(const G4Track& track,
                                                            const G4Step& step)
{
    return AtRestDoIt(track, step);
}
 
//______________________________________________________________________________
 
G4double G4DNAMolecularDissociation::GetMeanFreePath(const G4Track&,
                                                     G4double,
                                                     G4ForceCondition*)
{
    return 0;
}