#include <G4DNADoubleIonisationModel.hh>

Inheritance diagram for G4DNADoubleIonisationModel:

Public Member Functions
	G4DNADoubleIonisationModel (const G4ParticleDefinition *p=nullptr, const G4String &model_name="G4DNADoubleIonisationModel")

	~G4DNADoubleIonisationModel () override

G4DNADoubleIonisationModel &	operator= (const G4DNADoubleIonisationModel &)=delete

	G4DNADoubleIonisationModel (const G4DNADoubleIonisationModel &)=delete

void	Initialise (const G4ParticleDefinition *particle, const G4DataVector &) override

G4double	CrossSectionPerVolume (const G4Material material, const G4ParticleDefinition pdef, G4double ekin, G4double, G4double) override

void	SampleSecondaries (std::vector< G4DynamicParticle * > vsec, const G4MaterialCutsCouple couple, const G4DynamicParticle *particle, G4double, G4double) override

void	SelectStationary (G4bool in)

void	SelectVerboseLevel (G4int in)

void	UseChampionAlphaParameter (G4bool in)

void	SetMultipleIonisationEnergy (G4double in)

Public Member Functions inherited from G4VEmModel
	G4VEmModel (const G4String &nam)

virtual	~G4VEmModel ()

virtual void	InitialiseLocal (const G4ParticleDefinition , G4VEmModel masterModel)

virtual void	InitialiseForMaterial (const G4ParticleDefinition , const G4Material )

virtual void	InitialiseForElement (const G4ParticleDefinition *, G4int Z)

virtual G4double	ComputeDEDXPerVolume (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

virtual G4double	GetPartialCrossSection (const G4Material , G4int level, const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0., G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

virtual G4double	ComputeCrossSectionPerShell (const G4ParticleDefinition *, G4int Z, G4int shellIdx, G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

virtual G4double	ChargeSquareRatio (const G4Track &)

virtual G4double	GetChargeSquareRatio (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual G4double	GetParticleCharge (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	StartTracking (G4Track *)

virtual void	CorrectionsAlongStep (const G4MaterialCutsCouple , const G4DynamicParticle , const G4double &length, G4double &eloss)

virtual G4double	Value (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy)

virtual G4double	MinPrimaryEnergy (const G4Material , const G4ParticleDefinition , G4double cut=0.0)

virtual G4double	MinEnergyCut (const G4ParticleDefinition , const G4MaterialCutsCouple )

virtual void	SetupForMaterial (const G4ParticleDefinition , const G4Material , G4double kineticEnergy)

virtual void	DefineForRegion (const G4Region *)

virtual void	FillNumberOfSecondaries (G4int &numberOfTriplets, G4int &numberOfRecoil)

virtual void	ModelDescription (std::ostream &outFile) const

void	InitialiseElementSelectors (const G4ParticleDefinition *, const G4DataVector &)

std::vector< G4EmElementSelector * > *	GetElementSelectors ()

void	SetElementSelectors (std::vector< G4EmElementSelector * > *)

G4double	ComputeDEDX (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=DBL_MAX)

G4double	CrossSection (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeMeanFreePath (const G4ParticleDefinition , G4double kineticEnergy, const G4Material , G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition , const G4Element , G4double kinEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectTargetAtom (const G4MaterialCutsCouple , const G4ParticleDefinition , G4double kineticEnergy, G4double logKineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	SelectRandomAtom (const G4Material , const G4ParticleDefinition , G4double kineticEnergy, G4double cutEnergy=0.0, G4double maxEnergy=DBL_MAX)

const G4Element *	GetCurrentElement (const G4Material *mat=nullptr) const

G4int	SelectRandomAtomNumber (const G4Material *) const

const G4Isotope *	GetCurrentIsotope (const G4Element *elm=nullptr) const

G4int	SelectIsotopeNumber (const G4Element *) const

void	SetParticleChange (G4VParticleChange , G4VEmFluctuationModel f=nullptr)

void	SetCrossSectionTable (G4PhysicsTable *, G4bool isLocal)

G4ElementData *	GetElementData ()

G4PhysicsTable *	GetCrossSectionTable ()

G4VEmFluctuationModel *	GetModelOfFluctuations ()

G4VEmAngularDistribution *	GetAngularDistribution ()

G4VEmModel *	GetTripletModel ()

void	SetTripletModel (G4VEmModel *)

void	SetAngularDistribution (G4VEmAngularDistribution *)

G4double	HighEnergyLimit () const

G4double	LowEnergyLimit () const

G4double	HighEnergyActivationLimit () const

G4double	LowEnergyActivationLimit () const

G4double	PolarAngleLimit () const

G4double	SecondaryThreshold () const

G4bool	DeexcitationFlag () const

G4bool	ForceBuildTableFlag () const

G4bool	UseAngularGeneratorFlag () const

void	SetAngularGeneratorFlag (G4bool)

void	SetHighEnergyLimit (G4double)

void	SetLowEnergyLimit (G4double)

void	SetActivationHighEnergyLimit (G4double)

void	SetActivationLowEnergyLimit (G4double)

G4bool	IsActive (G4double kinEnergy) const

void	SetPolarAngleLimit (G4double)

void	SetSecondaryThreshold (G4double)

void	SetDeexcitationFlag (G4bool val)

void	SetForceBuildTable (G4bool val)

void	SetFluctuationFlag (G4bool val)

G4bool	IsMaster () const

void	SetUseBaseMaterials (G4bool val)

G4bool	UseBaseMaterials () const

G4double	MaxSecondaryKinEnergy (const G4DynamicParticle *dynParticle)

const G4String &	GetName () const

void	SetCurrentCouple (const G4MaterialCutsCouple *)

G4bool	IsLocked () const

void	SetLocked (G4bool)

void	SetLPMFlag (G4bool)

void	SetMasterThread (G4bool)

G4VEmModel &	operator= (const G4VEmModel &right)=delete

	G4VEmModel (const G4VEmModel &)=delete

Protected Member Functions
G4double	RandomizeEjectedElectronEnergy (G4ParticleDefinition *pdef, G4double ekin, G4int shell)

G4int	RandomSelect (G4double energy, G4double scale_param, const G4String &pname)

G4double	GenerateSecondaries (std::vector< G4DynamicParticle * > vsec, const G4MaterialCutsCouple couple, const G4DynamicParticle *particle, G4int ioni_shell, G4double &theta, G4double &phi, G4double &shell_energy)

G4double	GetLowEnergyLimit (const G4String &pname)

G4double	GetUppEnergyLimit (const G4String &pname)

Protected Member Functions inherited from G4VEmModel
G4ParticleChangeForLoss *	GetParticleChangeForLoss ()

G4ParticleChangeForGamma *	GetParticleChangeForGamma ()

virtual G4double	MaxSecondaryEnergy (const G4ParticleDefinition *, G4double kineticEnergy)

const G4MaterialCutsCouple *	CurrentCouple () const

void	SetCurrentElement (const G4Element *)

Protected Attributes
G4ParticleChangeForGamma *	particle_change_ = nullptr

G4bool	stat_code_

G4VAtomDeexcitation *	atom_deex_

EnergyLimitTable	elow_tab_

EnergyLimitTable	eupp_tab_

CrossSectionDataTable	xs_tab_

G4ParticleDefinition *	proton_def_ {nullptr}

G4ParticleDefinition *	alpha_def_ {nullptr}

G4ParticleDefinition *	carbon_def_ {nullptr}

const std::vector< G4double > *	water_density_

G4bool	is_initialized_

G4int	verbose_level_

std::map< G4double, G4double >	model_elow_tab_

G4DNAMultipleIonisationManager *	mioni_manager_ {nullptr}

G4bool	use_champion_param_

G4double	energy_threshold_

Protected Attributes inherited from G4VEmModel
G4ElementData *	fElementData = nullptr

G4VParticleChange *	pParticleChange = nullptr

G4PhysicsTable *	xSectionTable = nullptr

const G4Material *	pBaseMaterial = nullptr

const std::vector< G4double > *	theDensityFactor = nullptr

const std::vector< G4int > *	theDensityIdx = nullptr

G4double	inveplus

G4double	pFactor = 1.0

std::size_t	currentCoupleIndex = 0

std::size_t	basedCoupleIndex = 0

G4bool	lossFlucFlag = true

Detailed Description

Definition at line 59 of file G4DNADoubleIonisationModel.hh.

Constructor & Destructor Documentation

◆ G4DNADoubleIonisationModel() [1/2]

G4DNADoubleIonisationModel::G4DNADoubleIonisationModel	(	const G4ParticleDefinition *	p = nullptr,
		const G4String &	model_name = "G4DNADoubleIonisationModel" )

Definition at line 215 of file G4DNADoubleIonisationModel.cc.

    : G4VEmModel(model_name),
      is_initialized_(false)
{
  water_density_ = nullptr;
 
  model_elow_tab_[1] = 100 * eV;
  model_elow_tab_[4] = 1.0 * keV;
  model_elow_tab_[5] = 0.5 * MeV; // For A = 3 or above, limit is MeV/uma
 
  verbose_level_ = 0;
 
  // Define default angular generator
  SetAngularDistribution(new G4DNARuddAngle());
 
  // Mark this model as "applicable" for atomic deexcitation
  SetDeexcitationFlag(true);
  atom_deex_ = nullptr;
  particle_change_ = nullptr;
 
  // Selection of stationary mode
  stat_code_ = false;
 
  // True if use champion alpha parameter
  use_champion_param_ = false;
 
  // Double-ionization energy
  energy_threshold_ = 40.0 * eV;
}

Referenced by G4DNADoubleIonisationModel(), G4DNAQuadrupleIonisationModel::G4DNAQuadrupleIonisationModel(), G4DNATripleIonisationModel::G4DNATripleIonisationModel(), and operator=().

◆ ~G4DNADoubleIonisationModel()

G4DNADoubleIonisationModel::~G4DNADoubleIonisationModel ( )

override

Definition at line 247 of file G4DNADoubleIonisationModel.cc.

{
  for (const auto& x : xs_tab_) {
    G4DNACrossSectionDataSet* table = x.second;
    if (table) { delete table; }
  }
}

◆ G4DNADoubleIonisationModel() [2/2]

G4DNADoubleIonisationModel::G4DNADoubleIonisationModel ( const G4DNADoubleIonisationModel & )

delete

Member Function Documentation

◆ CrossSectionPerVolume()

G4double G4DNADoubleIonisationModel::CrossSectionPerVolume	(	const G4Material *	material,
		const G4ParticleDefinition *	pdef,
		G4double	ekin,
		G4double	,
		G4double	)

overridevirtual

Reimplemented from G4VEmModel.

Reimplemented in G4DNAQuadrupleIonisationModel, and G4DNATripleIonisationModel.

Definition at line 397 of file G4DNADoubleIonisationModel.cc.

{
 
  if (verbose_level_ > 3) {
    G4cout << "Calling G4DNADoubleIonisationModel::CrossSectionPerVolume()"
           << G4endl;
  }
 
  // Calculate total cross section for model
 
  if (pdef != proton_def_ && pdef != alpha_def_ && pdef != carbon_def_) {
    return 0.0;
  }
 
  static G4double water_dens = (*water_density_)[material->GetIndex()];
 
  const auto& pname = pdef->GetParticleName();
 
  const auto low_energy_lim = GetLowEnergyLimit(pname);
  const auto upp_energy_lim = GetUppEnergyLimit(pname);
 
  G4double sigma{0.0};
  if (ekin <= upp_energy_lim) {
 
    if (ekin < low_energy_lim) { ekin = low_energy_lim; }
 
    CrossSectionDataTable::iterator pos = xs_tab_.find(pname);
    if (pos == xs_tab_.end()) {
      G4Exception("G4DNADoubleIonisationModel::CrossSectionPerVolume",
                  "em0002", FatalException,
                  "Model not applicable to particle type.");
    }
 
    G4DNACrossSectionDataSet* table = pos->second;
    if (table != nullptr) {
      const auto a = mioni_manager_->GetAlphaParam(ekin);
      sigma = table->FindValue(ekin) * a;
    }
 
  }
 
  if (verbose_level_ > 2) {
 
    std::stringstream msg;
 
    msg << "----------------------------------------------------------------\n";
    msg << " G4DNADoubleIonisationModel - XS INFO START\n";
    msg << "  - Kinetic energy(eV): " << ekin/eV << ", Particle : "
        << pdef->GetParticleName() << "\n";
    msg << "  - Cross section per water molecule (cm^2):  "
        << sigma / cm / cm << "\n";
    msg << "  - Cross section per water molecule (cm^-1): "
        << sigma * water_dens / (1.0 / cm) << "\n";
    msg << " G4DNADoubleIonisationModel - XS INFO END\n";
    msg << "----------------------------------------------------------------\n";
 
    G4cout << msg.str() << G4endl;
 
  }
 
  return (sigma * water_dens);
 
}

◆ GenerateSecondaries()

G4double G4DNADoubleIonisationModel::GenerateSecondaries	(	std::vector< G4DynamicParticle * > *	vsec,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	particle,
		G4int	ioni_shell,
		G4double &	theta,
		G4double &	phi,
		G4double &	shell_energy )

protected

Definition at line 464 of file G4DNADoubleIonisationModel.cc.

{
  auto pdef = particle->GetDefinition();
 
  // get kinetic energy for a parent particle
  auto ekin1 = particle->GetKineticEnergy();
 
  // sample kinetic energy for a secondary electron
  auto ekin2 = RandomizeEjectedElectronEnergy(pdef, ekin1, ioni_shell);
 
  // sample momentum direction for a secondary electron
  auto sample_electron_direction = [this](
      const G4DynamicParticle* dp, G4double _ekin2, G4int _Z, G4int _ioni_shell,
      const G4MaterialCutsCouple* mcc, G4double& _theta, G4double& _phi) {
 
    G4ThreeVector locdir;
 
    if (_theta > 0.0) {
 
      auto costh = std::cos(_theta);
      auto sinth = std::sqrt((1.0 - costh) * (1.0 + costh));
      locdir.set(sinth * std::cos(_phi), sinth * std::sin(_phi), costh);
      locdir.rotateUz(dp->GetMomentumDirection());
 
    } else {
 
      locdir = GetAngularDistribution()->SampleDirectionForShell(
                  dp, _ekin2, _Z, _ioni_shell, mcc->GetMaterial());
      _theta = locdir.theta();
      _phi   = locdir.phi();
 
    }
 
    return locdir;
  };
 
  constexpr G4int Z = 8;
  auto delta_dir = sample_electron_direction(
                     particle, ekin2, Z, ioni_shell, couple, theta, phi);
 
  // generate a secondary electron and put it into the stack
  auto dp = new G4DynamicParticle(G4Electron::Electron(), delta_dir, ekin2);
  vsec->push_back(dp);
 
  if (!atom_deex_ || ioni_shell != 4) { return ekin2; }
 
  // ***************************************************************************
  // Only atomic deexcitation from K shell is considered
 
  constexpr auto k_shell = G4AtomicShellEnumerator(0);
  const auto shell = atom_deex_->GetAtomicShell(Z, k_shell);
 
  // get number of secondary electrons in the stack
  // before processing atomic deescitation
  const auto num_sec_init = vsec->size();
 
  // perform atomic deexcitation process
  atom_deex_->GenerateParticles(vsec, shell, Z, 0, 0);
 
  // get number of secondary electrons in the stack
  // after processing atomic deescitation
  const auto num_sec_final = vsec->size();
 
  if (num_sec_final == num_sec_init) { return ekin2; }
 
  for (auto i = num_sec_init; i < num_sec_final; i++) {
 
    auto e = ((*vsec)[i])->GetKineticEnergy();
 
    // Check if there is enough residual energy
    if (shell_energy < e) {
 
      // Invalid secondary: not enough energy to create it!
      // Keep its energy in the local deposit
      delete (*vsec)[i];
      (*vsec)[i] = 0;
 
      continue;
 
    }
 
    // Ok, this is a valid secondary: keep it
    shell_energy -= e;
  }
 
  // ***************************************************************************
 
  return ekin2;
}

Referenced by SampleSecondaries(), G4DNAQuadrupleIonisationModel::SampleSecondaries(), and G4DNATripleIonisationModel::SampleSecondaries().

◆ GetLowEnergyLimit()

G4double G4DNADoubleIonisationModel::GetLowEnergyLimit ( const G4String & pname )

protected

Definition at line 375 of file G4DNADoubleIonisationModel.cc.

{
  G4double elim{0.0};
 
  EnergyLimitTable::iterator itr = elow_tab_.find(pname);
  if (itr != elow_tab_.end()) { elim = itr->second; }
 
  return elim;
}

Referenced by CrossSectionPerVolume(), G4DNAQuadrupleIonisationModel::CrossSectionPerVolume(), G4DNATripleIonisationModel::CrossSectionPerVolume(), SampleSecondaries(), G4DNAQuadrupleIonisationModel::SampleSecondaries(), and G4DNATripleIonisationModel::SampleSecondaries().

◆ GetUppEnergyLimit()

G4double G4DNADoubleIonisationModel::GetUppEnergyLimit ( const G4String & pname )

protected

Definition at line 386 of file G4DNADoubleIonisationModel.cc.

{
  G4double elim{0.0};
 
  EnergyLimitTable::iterator itr = eupp_tab_.find(pname);
  if (itr != eupp_tab_.end()) { elim = itr->second; }
 
  return elim;
}

Referenced by CrossSectionPerVolume(), G4DNAQuadrupleIonisationModel::CrossSectionPerVolume(), and G4DNATripleIonisationModel::CrossSectionPerVolume().

◆ Initialise()

void G4DNADoubleIonisationModel::Initialise	(	const G4ParticleDefinition *	particle,
		const G4DataVector &	)

overridevirtual

Implements G4VEmModel.

Reimplemented in G4DNAQuadrupleIonisationModel, and G4DNATripleIonisationModel.

Definition at line 256 of file G4DNADoubleIonisationModel.cc.

{
  if (verbose_level_ > 3) {
    G4cout << "Calling G4DNADoubleIonisationModel::Initialise()" << G4endl;
  }
 
  proton_def_  = G4Proton::ProtonDefinition();
  alpha_def_   = G4DNAGenericIonsManager::Instance()->GetIon("alpha++");
  carbon_def_  = G4IonTable::GetIonTable()->GetIon(6, 12);
 
  constexpr G4double kScaleFactor = 1.0 * m * m;
 
  mioni_manager_ = new G4DNAMultipleIonisationManager();
 
  G4double Z{0.0}, A{0.0};
  G4String alpha_param_file{"dna/multipleionisation_alphaparam_champion.dat"};
 
  if (particle == proton_def_) {
 
    // *************************************************************************
    // for protons
    const auto& proton = proton_def_->GetParticleName();
    elow_tab_[proton] = model_elow_tab_[1];
    eupp_tab_[proton] = 3.0 * MeV;
 
    // load cross-section data for single ionization process
    auto xs_proton = new G4DNACrossSectionDataSet(
                          new G4LogLogInterpolation, eV, kScaleFactor);
    xs_proton->LoadData("dna/sigma_ionisation_p_rudd");
    xs_tab_[proton] = xs_proton;
 
    // set energy limits
    SetLowEnergyLimit(elow_tab_[proton]);
    SetHighEnergyLimit(eupp_tab_[proton]);
 
    if (!use_champion_param_) {
      alpha_param_file = "dna/multipleionisation_alphaparam_p.dat";
    }
 
    Z = static_cast<G4double>(proton_def_->GetAtomicNumber());
    A = static_cast<G4double>(proton_def_->GetAtomicMass());
 
  } else if (particle == alpha_def_) {
 
    //**************************************************************************
    // for alpha particles
    const auto& alpha = alpha_def_->GetParticleName();
    elow_tab_[alpha] = model_elow_tab_[4];
    eupp_tab_[alpha] = 23.0 * MeV;
 
    // load cross-section data for single ionization process
    auto xs_alpha = new G4DNACrossSectionDataSet(
                        new G4LogLogInterpolation, eV, kScaleFactor);
    xs_alpha->LoadData("dna/sigma_ionisation_alphaplusplus_rudd");
    xs_tab_[alpha] = xs_alpha;
 
    // set energy limits
    SetLowEnergyLimit(elow_tab_[alpha]);
    SetHighEnergyLimit(eupp_tab_[alpha]);
 
    if (!use_champion_param_) {
      alpha_param_file = "dna/multipleionisation_alphaparam_alphaplusplus.dat";
    }
 
    Z = static_cast<G4double>(alpha_def_->GetAtomicNumber());
    A = static_cast<G4double>(alpha_def_->GetAtomicMass());
 
  } else if (particle == G4GenericIon::GenericIonDefinition()) {
 
    // *************************************************************************
    // for carbon ions
    const auto& carbon = carbon_def_->GetParticleName();
    elow_tab_[carbon] = model_elow_tab_[5] * carbon_def_->GetAtomicMass();
    eupp_tab_[carbon] = 120.0 * MeV;
 
    // load cross-section data for single ionization process
    auto xs_carbon = new G4DNACrossSectionDataSet(
                        new G4LogLogInterpolation, eV, kScaleFactor);
    xs_carbon->LoadData("dna/sigma_ionisation_c_rudd");
    xs_tab_[carbon] = xs_carbon;
 
    // set energy limits
    SetLowEnergyLimit(elow_tab_[carbon]);
    SetHighEnergyLimit(eupp_tab_[carbon]);
 
    if (!use_champion_param_) {
      alpha_param_file = "dna/multipleionisation_alphaparam_c.dat";
    }
 
    Z = static_cast<G4double>(carbon_def_->GetAtomicNumber());
    A = static_cast<G4double>(carbon_def_->GetAtomicMass());
 
  }
 
  // load alpha parameter
  mioni_manager_->LoadAlphaParam(alpha_param_file, Z, A);
 
  if (verbose_level_ > 0) {
    G4cout << "G4DNADoubleIonisationModel is initialized " << G4endl
           << "Energy range: "
           << LowEnergyLimit() / eV << " eV - "
           << HighEnergyLimit() / keV << " keV for "
           << particle->GetParticleName()
           << G4endl;
  }
 
  water_density_ = G4DNAMolecularMaterial::Instance()->GetNumMolPerVolTableFor(
                      G4Material::GetMaterial("G4_WATER"));
 
  atom_deex_ = G4LossTableManager::Instance()->AtomDeexcitation();
 
  if (is_initialized_) { return; }
 
  particle_change_ = GetParticleChangeForGamma();
  is_initialized_ = true;
}

◆ operator=()

G4DNADoubleIonisationModel & G4DNADoubleIonisationModel::operator= ( const G4DNADoubleIonisationModel & )

delete

◆ RandomizeEjectedElectronEnergy()

G4double G4DNADoubleIonisationModel::RandomizeEjectedElectronEnergy	(	G4ParticleDefinition *	pdef,
		G4double	ekin,
		G4int	shell )

protected

Definition at line 651 of file G4DNADoubleIonisationModel.cc.

{
 
  //
  // based on RandomizeEjectedElectronEnergy()
  //     of G4DNARuddIonisationExtendedModel
  //
 
  ::FuncParams par;
  ::setup_rejection_function(pdef, ekin, shell, par);
 
  // calculate maximum value
  G4double emax{0.0}, val;
  for (G4double en = 0.0; en < 20.0; en += 1.0) {
    val = ::rejection_function(pdef, shell, par, en);
    if (val <= emax) { continue; }
    emax = val;
  }
 
  G4double proposed_energy, rand;
  do {
    // Proposed energy by inverse function sampling
    proposed_energy = ::proposed_sampled_energy(par);
    rand = G4UniformRand() * emax;
    val = ::rejection_function(pdef, shell, par, proposed_energy);
  } while (rand > val);
 
  return proposed_energy;
}

Referenced by GenerateSecondaries().

◆ RandomSelect()

G4int G4DNADoubleIonisationModel::RandomSelect	(	G4double	energy,
		G4double	scale_param,
		const G4String &	pname )

protected

Definition at line 683 of file G4DNADoubleIonisationModel.cc.

{
 
  //
  // based on RandomSelect() of G4DNARuddIonisationExtendedModel
  //
 
  // Retrieve data table corresponding to the current particle type
  CrossSectionDataTable::iterator pos = xs_tab_.find(pname);
 
  if (pos == xs_tab_.end()) {
    G4Exception("G4DNADoubleIonisationModel::RandomSelect", "em0002",
        FatalException, "Model not applicable to particle type.");
  }
 
  G4DNACrossSectionDataSet* table = pos->second;
 
  if (table != nullptr) {
 
    // get total number of energy level
    const auto num_component = table->NumberOfComponents();
 
    auto* valuesBuffer = new G4double[num_component];
 
    auto shell = num_component;
    G4double value = 0.0;
 
    while (shell > 0) {
      shell--;
      valuesBuffer[shell] = table->GetComponent((G4int)shell)->FindValue(ekin)
                              * scale_param;
      value += valuesBuffer[shell];
    }
 
    value *= G4UniformRand();
 
    shell = num_component;
 
    while (shell > 0) {
      shell--;
      if (valuesBuffer[shell] > value) {
        delete [] valuesBuffer;
        return (G4int)shell;
      }
      value -= valuesBuffer[shell];
    }
 
    delete [] valuesBuffer;
  }
 
  return 0;
}

Referenced by SampleSecondaries(), G4DNAQuadrupleIonisationModel::SampleSecondaries(), and G4DNATripleIonisationModel::SampleSecondaries().

◆ SampleSecondaries()

void G4DNADoubleIonisationModel::SampleSecondaries	(	std::vector< G4DynamicParticle * > *	vsec,
		const G4MaterialCutsCouple *	couple,
		const G4DynamicParticle *	particle,
		G4double	,
		G4double	)

overridevirtual

Implements G4VEmModel.

Reimplemented in G4DNAQuadrupleIonisationModel, and G4DNATripleIonisationModel.

Definition at line 558 of file G4DNADoubleIonisationModel.cc.

{
 
  if (verbose_level_ > 3) {
    G4cout << "Calling SampleSecondaries() of G4DNADoubleIonisationModel"
           << G4endl;
  }
 
  // get the definition for this parent particle
  auto pdef = particle->GetDefinition();
 
  // get kinetic energy
  auto ekin = particle->GetKineticEnergy();
 
  // get particle name
  const auto& pname = pdef->GetParticleName();
 
  // get energy limits
  const auto low_energy_lim = GetLowEnergyLimit(pname);
 
  // ***************************************************************************
  // stop the transportation process of this parent particle
  // if its kinetic energy  is below the lower limit
  if (ekin < low_energy_lim) {
    particle_change_->SetProposedKineticEnergy(0.0);
    particle_change_->ProposeTrackStatus(fStopAndKill);
    particle_change_->ProposeLocalEnergyDeposit(ekin);
    return;
  }
  // ***************************************************************************
 
  constexpr G4int kNumSecondaries = 2;
  constexpr G4double kDeltaTheta  = pi;
 
  G4int ioni_shell[kNumSecondaries];
  G4double shell_energy[kNumSecondaries];
 
  const auto scale_param = mioni_manager_->GetAlphaParam(ekin);
  G4double tot_ioni_energy{0.0};
  for (G4int i = 0; i < kNumSecondaries; i++) {
    ioni_shell[i]   = RandomSelect(ekin, scale_param, pname);
    shell_energy[i] = ::water_structure.IonisationEnergy(ioni_shell[i]);
    tot_ioni_energy += shell_energy[i];
  }
 
  if (ekin < tot_ioni_energy || tot_ioni_energy < energy_threshold_) {
    return;
  }
 
  // generate secondary electrons
  G4double theta{0.0}, phi{0.0}, tot_ekin2{0.0};
  for (G4int i = 0; i < kNumSecondaries; i++) {
    tot_ekin2 += GenerateSecondaries(vsec, couple, particle, ioni_shell[i],
                                     theta, phi, shell_energy[i]);
    theta += kDeltaTheta;
  }
 
  // This should never happen
  if (mioni_manager_->CheckShellEnergy(eDoubleIonisedMolecule, shell_energy)) {
    G4Exception("G4DNADoubleIonisatioModel::SampleSecondaries()",
        "em2050", FatalException, "Negative local energy deposit");
  }
 
  // ***************************************************************************
  // update kinematics for this parent particle
  const auto primary_dir = particle->GetMomentumDirection();
  particle_change_->ProposeMomentumDirection(primary_dir);
 
  const auto scattered_energy = ekin - tot_ioni_energy - tot_ekin2;
 
  // update total amount of shell energy
  tot_ioni_energy = shell_energy[0] + shell_energy[1];
 
  if (stat_code_) {
    particle_change_->SetProposedKineticEnergy(ekin);
    particle_change_->ProposeLocalEnergyDeposit(ekin - scattered_energy);
  } else {
    particle_change_->SetProposedKineticEnergy(scattered_energy);
    particle_change_->ProposeLocalEnergyDeposit(tot_ioni_energy);
  }
 
  // ***************************************************************************
  // generate double-ionized water molecules (H2O^2+)
  const auto the_track = particle_change_->GetCurrentTrack();
  mioni_manager_->CreateMultipleIonisedWaterMolecule(
                    eDoubleIonisedMolecule, ioni_shell, the_track);
  // ***************************************************************************
 
}