#include <G4UrbanMscModel.hh>

Inheritance diagram for G4UrbanMscModel:

Public Member Functions
	G4UrbanMscModel (const G4String &nam="UrbanMsc")

	~G4UrbanMscModel () override

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

void	StartTracking (G4Track *) override

G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *particle, G4double KineticEnergy, G4double AtomicNumber, G4double AtomicWeight=0., G4double cut=0., G4double emax=DBL_MAX) override

G4ThreeVector &	SampleScattering (const G4ThreeVector &, G4double safety) override

G4double	ComputeTruePathLengthLimit (const G4Track &track, G4double &currentMinimalStep) override

G4double	ComputeGeomPathLength (G4double truePathLength) override

G4double	ComputeTrueStepLength (G4double geomStepLength) override

G4double	ComputeTheta0 (G4double truePathLength, G4double KineticEnergy)

void	SetDisplacementAlgorithm96 (const G4bool val)

void	SetPositronCorrection (const G4bool val)

G4UrbanMscModel &	operator= (const G4UrbanMscModel &right)=delete

	G4UrbanMscModel (const G4UrbanMscModel &)=delete

Public Member Functions inherited from G4VMscModel
	G4VMscModel (const G4String &nam)

	~G4VMscModel () override

void	InitialiseParameters (const G4ParticleDefinition *)

void	DumpParameters (std::ostream &out) const

void	SampleSecondaries (std::vector< G4DynamicParticle * > , const G4MaterialCutsCouple , const G4DynamicParticle *, G4double tmin, G4double tmax) override

void	SetStepLimitType (G4MscStepLimitType)

void	SetLateralDisplasmentFlag (G4bool val)

void	SetRangeFactor (G4double)

void	SetGeomFactor (G4double)

void	SetSkin (G4double)

void	SetLambdaLimit (G4double)

void	SetSafetyFactor (G4double)

void	SetSampleZ (G4bool)

G4VEnergyLossProcess *	GetIonisation () const

void	SetIonisation (G4VEnergyLossProcess , const G4ParticleDefinition part)

G4double	ComputeSafety (const G4ThreeVector &position, G4double limit=DBL_MAX)

G4double	ComputeGeomLimit (const G4Track &, G4double &presafety, G4double limit)

G4double	GetDEDX (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple)

G4double	GetDEDX (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple, G4double logKineticEnergy)

G4double	GetRange (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple)

G4double	GetRange (const G4ParticleDefinition part, G4double kineticEnergy, const G4MaterialCutsCouple couple, G4double logKineticEnergy)

G4double	GetEnergy (const G4ParticleDefinition part, G4double range, const G4MaterialCutsCouple couple)

G4double	GetTransportMeanFreePath (const G4ParticleDefinition *part, G4double kinEnergy)

G4double	GetTransportMeanFreePath (const G4ParticleDefinition *part, G4double kinEnergy, G4double logKinEnergy)

G4VMscModel &	operator= (const G4VMscModel &right)=delete

	G4VMscModel (const G4VMscModel &)=delete

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

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

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	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

Additional Inherited Members
Protected Member Functions inherited from G4VMscModel
G4ParticleChangeForMSC *	GetParticleChangeForMSC (const G4ParticleDefinition *p=nullptr)

G4double	ConvertTrueToGeom (G4double &tLength, G4double &gLength)

void	SetUseSplineForMSC (G4bool val)

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 inherited from G4VMscModel
G4double	facrange = 0.04

G4double	facgeom = 2.5

G4double	facsafety = 0.6

G4double	skin = 1.0

G4double	dtrl = 0.05

G4double	lambdalimit

G4double	geomMin

G4double	geomMax

G4ThreeVector	fDisplacement

G4MscStepLimitType	steppingAlgorithm

G4bool	samplez = false

G4bool	latDisplasment = true

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 69 of file G4UrbanMscModel.hh.

Constructor & Destructor Documentation

◆ G4UrbanMscModel() [1/2]

G4UrbanMscModel::G4UrbanMscModel ( const G4String & nam = "UrbanMsc" )

explicit

Definition at line 81 of file G4UrbanMscModel.cc.

  : G4VMscModel(nam)
{
  masslimite    = 0.6*CLHEP::MeV;
  fr            = 0.02;
  taubig        = 8.0;
  tausmall      = 1.e-16;
  taulim        = 1.e-6;
  currentTau    = taulim;
  tlimitminfix  = 0.01*CLHEP::nm;             
  tlimitminfix2 = 1.*CLHEP::nm;
  stepmin       = tlimitminfix;
  smallstep     = 1.e10;
  currentRange  = 0.;
  rangeinit     = 0.;
  tlimit        = 1.e10*CLHEP::mm;
  tlimitmin     = 10.*tlimitminfix;            
  tgeom         = 1.e50*CLHEP::mm;
  geombig       = tgeom;
  geommin       = 1.e-3*CLHEP::mm;
  geomlimit     = geombig;
  presafety     = 0.;
 
  positron      = G4Positron::Positron();
  rndmEngineMod = G4Random::getTheEngine();
 
  drr = 0.35;
  finalr = 10.*CLHEP::um;
 
  tlow = 5.*CLHEP::keV;
  invmev = 1.0/CLHEP::MeV;
 
  skindepth = skin*stepmin;
 
  mass = CLHEP::proton_mass_c2;
  charge = chargeSquare = 1.0;
  currentKinEnergy = currentRadLength = lambda0 = lambdaeff = tPathLength 
    = zPathLength = par1 = par2 = par3 = rndmarray[0] = rndmarray[1] = 0;
  currentLogKinEnergy = LOG_EKIN_MIN;
}

Referenced by G4UrbanMscModel(), and operator=().

◆ ~G4UrbanMscModel()

G4UrbanMscModel::~G4UrbanMscModel ( )

override

Definition at line 124 of file G4UrbanMscModel.cc.

{
  if(isFirstInstance) {
    for(auto const & ptr : msc) { delete ptr; }
    msc.clear();
  } 
}

◆ G4UrbanMscModel() [2/2]

G4UrbanMscModel::G4UrbanMscModel ( const G4UrbanMscModel & )

delete

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

G4double G4UrbanMscModel::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	particle,
		G4double	KineticEnergy,
		G4double	AtomicNumber,
		G4double	AtomicWeight = 0.,
		G4double	cut = 0.,
		G4double	emax = DBL_MAX )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 173 of file G4UrbanMscModel.cc.

{
  static const G4double epsmin = 1.e-4 , epsmax = 1.e10;
 
  static const G4double Zdat[15] = { 4.,  6., 13., 20., 26., 29., 32., 38.,47.,
                                     50., 56., 64., 74., 79., 82. };
 
  // corr. factors for e-/e+ lambda for T <= Tlim
  static const G4double celectron[15][22] =
          {{1.125,1.072,1.051,1.047,1.047,1.050,1.052,1.054,
            1.054,1.057,1.062,1.069,1.075,1.090,1.105,1.111,
            1.112,1.108,1.100,1.093,1.089,1.087            },
           {1.408,1.246,1.143,1.096,1.077,1.059,1.053,1.051,
            1.052,1.053,1.058,1.065,1.072,1.087,1.101,1.108,
            1.109,1.105,1.097,1.090,1.086,1.082            },
           {2.833,2.268,1.861,1.612,1.486,1.309,1.204,1.156,
            1.136,1.114,1.106,1.106,1.109,1.119,1.129,1.132,
            1.131,1.124,1.113,1.104,1.099,1.098            },
           {3.879,3.016,2.380,2.007,1.818,1.535,1.340,1.236,
            1.190,1.133,1.107,1.099,1.098,1.103,1.110,1.113,
            1.112,1.105,1.096,1.089,1.085,1.098            },
           {6.937,4.330,2.886,2.256,1.987,1.628,1.395,1.265,
            1.203,1.122,1.080,1.065,1.061,1.063,1.070,1.073,
            1.073,1.070,1.064,1.059,1.056,1.056            },
           {9.616,5.708,3.424,2.551,2.204,1.762,1.485,1.330,
            1.256,1.155,1.099,1.077,1.070,1.068,1.072,1.074,
            1.074,1.070,1.063,1.059,1.056,1.052            },
           {11.72,6.364,3.811,2.806,2.401,1.884,1.564,1.386,
            1.300,1.180,1.112,1.082,1.073,1.066,1.068,1.069,
            1.068,1.064,1.059,1.054,1.051,1.050            },
           {18.08,8.601,4.569,3.183,2.662,2.025,1.646,1.439,
            1.339,1.195,1.108,1.068,1.053,1.040,1.039,1.039,
            1.039,1.037,1.034,1.031,1.030,1.036            },
           {18.22,10.48,5.333,3.713,3.115,2.367,1.898,1.631,
            1.498,1.301,1.171,1.105,1.077,1.048,1.036,1.033,
            1.031,1.028,1.024,1.022,1.021,1.024            },
           {14.14,10.65,5.710,3.929,3.266,2.453,1.951,1.669,
            1.528,1.319,1.178,1.106,1.075,1.040,1.027,1.022,
            1.020,1.017,1.015,1.013,1.013,1.020            },
           {14.11,11.73,6.312,4.240,3.478,2.566,2.022,1.720,
            1.569,1.342,1.186,1.102,1.065,1.022,1.003,0.997,
            0.995,0.993,0.993,0.993,0.993,1.011            },
           {22.76,20.01,8.835,5.287,4.144,2.901,2.219,1.855,
            1.677,1.410,1.224,1.121,1.073,1.014,0.986,0.976,
            0.974,0.972,0.973,0.974,0.975,0.987            },
           {50.77,40.85,14.13,7.184,5.284,3.435,2.520,2.059,
            1.837,1.512,1.283,1.153,1.091,1.010,0.969,0.954,
            0.950,0.947,0.949,0.952,0.954,0.963            },
           {65.87,59.06,15.87,7.570,5.567,3.650,2.682,2.182,
            1.939,1.579,1.325,1.178,1.108,1.014,0.965,0.947,
            0.941,0.938,0.940,0.944,0.946,0.954            },
           {55.60,47.34,15.92,7.810,5.755,3.767,2.760,2.239,
            1.985,1.609,1.343,1.188,1.113,1.013,0.960,0.939,
            0.933,0.930,0.933,0.936,0.939,0.949            }};
            
  static const G4double cpositron[15][22] = {
           {2.589,2.044,1.658,1.446,1.347,1.217,1.144,1.110,
            1.097,1.083,1.080,1.086,1.092,1.108,1.123,1.131,
            1.131,1.126,1.117,1.108,1.103,1.100            },
           {3.904,2.794,2.079,1.710,1.543,1.325,1.202,1.145,
            1.122,1.096,1.089,1.092,1.098,1.114,1.130,1.137,
            1.138,1.132,1.122,1.113,1.108,1.102            },
           {7.970,6.080,4.442,3.398,2.872,2.127,1.672,1.451,
            1.357,1.246,1.194,1.179,1.178,1.188,1.201,1.205,
            1.203,1.190,1.173,1.159,1.151,1.145            },
           {9.714,7.607,5.747,4.493,3.815,2.777,2.079,1.715,
            1.553,1.353,1.253,1.219,1.211,1.214,1.225,1.228,
            1.225,1.210,1.191,1.175,1.166,1.174            },
           {17.97,12.95,8.628,6.065,4.849,3.222,2.275,1.820,
            1.624,1.382,1.259,1.214,1.202,1.202,1.214,1.219,
            1.217,1.203,1.184,1.169,1.160,1.151            },
           {24.83,17.06,10.84,7.355,5.767,3.707,2.546,1.996,
            1.759,1.465,1.311,1.252,1.234,1.228,1.238,1.241,
            1.237,1.222,1.201,1.184,1.174,1.159            },
           {23.26,17.15,11.52,8.049,6.375,4.114,2.792,2.155,
            1.880,1.535,1.353,1.281,1.258,1.247,1.254,1.256,
            1.252,1.234,1.212,1.194,1.183,1.170            },
           {22.33,18.01,12.86,9.212,7.336,4.702,3.117,2.348,
            2.015,1.602,1.385,1.297,1.268,1.251,1.256,1.258,
            1.254,1.237,1.214,1.195,1.185,1.179            },
           {33.91,24.13,15.71,10.80,8.507,5.467,3.692,2.808,
            2.407,1.873,1.564,1.425,1.374,1.330,1.324,1.320,
            1.312,1.288,1.258,1.235,1.221,1.205            },
           {32.14,24.11,16.30,11.40,9.015,5.782,3.868,2.917,
            2.490,1.925,1.596,1.447,1.391,1.342,1.332,1.327,
            1.320,1.294,1.264,1.240,1.226,1.214            },
           {29.51,24.07,17.19,12.28,9.766,6.238,4.112,3.066,
            2.602,1.995,1.641,1.477,1.414,1.356,1.342,1.336,
            1.328,1.302,1.270,1.245,1.231,1.233            },
           {38.19,30.85,21.76,15.35,12.07,7.521,4.812,3.498,
            2.926,2.188,1.763,1.563,1.484,1.405,1.382,1.371,
            1.361,1.330,1.294,1.267,1.251,1.239            },
           {49.71,39.80,27.96,19.63,15.36,9.407,5.863,4.155,
            3.417,2.478,1.944,1.692,1.589,1.480,1.441,1.423,
            1.409,1.372,1.330,1.298,1.280,1.258            },
           {59.25,45.08,30.36,20.83,16.15,9.834,6.166,4.407,
            3.641,2.648,2.064,1.779,1.661,1.531,1.482,1.459,
            1.442,1.400,1.354,1.319,1.299,1.272            },
           {56.38,44.29,30.50,21.18,16.51,10.11,6.354,4.542,
            3.752,2.724,2.116,1.817,1.692,1.554,1.499,1.474,
            1.456,1.412,1.364,1.328,1.307,1.282            }};
 
  //data/corrections for T > Tlim  
                                             
  static const G4double hecorr[15] = {
    120.70, 117.50, 105.00, 92.92, 79.23,  74.510,  68.29,
    57.39,  41.97,  36.14, 24.53, 10.21,  -7.855, -16.84,
    -22.30};
 
  G4double sigma;
  SetParticle(part);
 
  G4double Z23 = G4Pow::GetInstance()->Z23(G4lrint(atomicNumber));
 
  // correction if particle .ne. e-/e+
  // compute equivalent kinetic energy
  // lambda depends on p*beta ....
 
  G4double eKineticEnergy = kinEnergy;
 
  if(mass > CLHEP::electron_mass_c2)
  {
     G4double TAU = kinEnergy/mass ;
     G4double c = mass*TAU*(TAU+2.)/(CLHEP::electron_mass_c2*(TAU+1.)) ;
     G4double w = c-2.;
     G4double tau = 0.5*(w+std::sqrt(w*w+4.*c)) ;
     eKineticEnergy = CLHEP::electron_mass_c2*tau ;
  }
 
  G4double eTotalEnergy = eKineticEnergy + CLHEP::electron_mass_c2 ;
  G4double beta2 = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
                                 /(eTotalEnergy*eTotalEnergy);
  G4double bg2   = eKineticEnergy*(eTotalEnergy+CLHEP::electron_mass_c2)
                                 /(CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
 
  static const G4double epsfactor = 2.*CLHEP::electron_mass_c2*
    CLHEP::electron_mass_c2*CLHEP::Bohr_radius*CLHEP::Bohr_radius
    /(CLHEP::hbarc*CLHEP::hbarc);
  G4double eps = epsfactor*bg2/Z23;
 
  if     (eps<epsmin)  sigma = 2.*eps*eps;
  else if(eps<epsmax)  sigma = G4Log(1.+2.*eps)-2.*eps/(1.+2.*eps);
  else                 sigma = G4Log(2.*eps)-1.+1./eps;
 
  sigma *= chargeSquare*atomicNumber*atomicNumber/(beta2*bg2);
 
  // interpolate in AtomicNumber and beta2 
  G4double c1,c2,cc1;
 
  // get bin number in Z
  G4int iZ = 14;
  // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
  while ((iZ>=0)&&(Zdat[iZ]>=atomicNumber)) { --iZ; }
 
  iZ = std::min(std::max(iZ, 0), 13);
 
  G4double ZZ1 = Zdat[iZ];
  G4double ZZ2 = Zdat[iZ+1];
  G4double ratZ = (atomicNumber-ZZ1)*(atomicNumber+ZZ1)/
                  ((ZZ2-ZZ1)*(ZZ2+ZZ1));
 
  static const G4double Tlim = 10.*CLHEP::MeV;
  static const G4double sigmafactor =
    CLHEP::twopi*CLHEP::classic_electr_radius*CLHEP::classic_electr_radius;
  static const G4double beta2lim = Tlim*(Tlim+2.*CLHEP::electron_mass_c2)/
    ((Tlim+CLHEP::electron_mass_c2)*(Tlim+CLHEP::electron_mass_c2));
  static const G4double bg2lim   = Tlim*(Tlim+2.*CLHEP::electron_mass_c2)/
    (CLHEP::electron_mass_c2*CLHEP::electron_mass_c2);
 
  static const G4double sig0[15] = {
    0.2672*CLHEP::barn,  0.5922*CLHEP::barn,  2.653*CLHEP::barn, 6.235*CLHEP::barn,
    11.69*CLHEP::barn  , 13.24*CLHEP::barn  , 16.12*CLHEP::barn, 23.00*CLHEP::barn,
    35.13*CLHEP::barn  , 39.95*CLHEP::barn  , 50.85*CLHEP::barn, 67.19*CLHEP::barn,
    91.15*CLHEP::barn  , 104.4*CLHEP::barn  , 113.1*CLHEP::barn};
 
  static const G4double Tdat[22] = { 
    100*CLHEP::eV,  200*CLHEP::eV,  400*CLHEP::eV,  700*CLHEP::eV,
    1*CLHEP::keV,   2*CLHEP::keV,   4*CLHEP::keV,   7*CLHEP::keV,
    10*CLHEP::keV,  20*CLHEP::keV,  40*CLHEP::keV,  70*CLHEP::keV,
    100*CLHEP::keV, 200*CLHEP::keV, 400*CLHEP::keV, 700*CLHEP::keV,
    1*CLHEP::MeV,   2*CLHEP::MeV,   4*CLHEP::MeV,   7*CLHEP::MeV,
    10*CLHEP::MeV,  20*CLHEP::MeV};
 
  if(eKineticEnergy <= Tlim) 
  {
    // get bin number in T (beta2)
    G4int iT = 21;
    // Loop checking, 03-Aug-2015, Vladimir Ivanchenko
    while ((iT>=0)&&(Tdat[iT]>=eKineticEnergy)) iT -= 1;
 
    iT = std::min(std::max(iT, 0), 20);
 
    //  calculate betasquare values
    G4double T = Tdat[iT];
    G4double E = T + CLHEP::electron_mass_c2;
    G4double b2small = T*(E+CLHEP::electron_mass_c2)/(E*E);
 
    T = Tdat[iT+1];
    E = T + CLHEP::electron_mass_c2;
    G4double b2big = T*(E+CLHEP::electron_mass_c2)/(E*E);
    G4double ratb2 = (beta2-b2small)/(b2big-b2small);
 
    if (charge < 0.)
    {
       c1 = celectron[iZ][iT];
       c2 = celectron[iZ+1][iT];
       cc1 = c1+ratZ*(c2-c1);
 
       c1 = celectron[iZ][iT+1];
       c2 = celectron[iZ+1][iT+1];
    }
    else              
    {
       c1 = cpositron[iZ][iT];
       c2 = cpositron[iZ+1][iT];
       cc1 = c1+ratZ*(c2-c1);
 
       c1 = cpositron[iZ][iT+1];
       c2 = cpositron[iZ+1][iT+1];
    }
    G4double cc2 = c1+ratZ*(c2-c1);
    sigma *= sigmafactor/(cc1+ratb2*(cc2-cc1));
  }
  else
  {
    c1 = bg2lim*sig0[iZ]*(1.+hecorr[iZ]*(beta2-beta2lim))/bg2;
    c2 = bg2lim*sig0[iZ+1]*(1.+hecorr[iZ+1]*(beta2-beta2lim))/bg2;
    if((atomicNumber >= ZZ1) && (atomicNumber <= ZZ2))
      sigma = c1+ratZ*(c2-c1) ;
    else if(atomicNumber < ZZ1)
      sigma = atomicNumber*atomicNumber*c1/(ZZ1*ZZ1);
    else if(atomicNumber > ZZ2)
      sigma = atomicNumber*atomicNumber*c2/(ZZ2*ZZ2);
  }
  // low energy correction based on theory 
  sigma *= (1.+0.30/(1.+std::sqrt(1000.*eKineticEnergy)));  
 
  return sigma;
}

◆ ComputeGeomPathLength()

G4double G4UrbanMscModel::ComputeGeomPathLength ( G4double truePathLength )

overridevirtual

Implements G4VMscModel.

Definition at line 671 of file G4UrbanMscModel.cc.

{
  lambdaeff = lambda0;
  par1 = -1. ;  
  par2 = par3 = 0. ;  
 
  // this correction needed to run MSC with eIoni and eBrem inactivated
  // and makes no harm for a normal run
  tPathLength = std::min(tPathLength,currentRange); 
 
  //  do the true -> geom transformation
  zPathLength = tPathLength;
 
  // z = t for very small tPathLength
  if(tPathLength < tlimitminfix2) return zPathLength;
 
  /*
  G4cout << "ComputeGeomPathLength: tpl= " <<  tPathLength
         << " R= " << currentRange << " L0= " << lambda0
         << " E= " << currentKinEnergy << "  " 
         << particle->GetParticleName() << G4endl;
  */
  G4double tau = tPathLength/lambda0 ;
 
  if ((tau <= tausmall) || insideskin) {
    zPathLength = std::min(tPathLength, lambda0); 
 
  } else if (tPathLength < currentRange*dtrl) {
    zPathLength = (tau < taulim) ? tPathLength*(1.-0.5*tau)
      : lambda0*(1.-G4Exp(-tau));
 
  } else if(currentKinEnergy < mass || tPathLength == currentRange)  {
    par1 = 1./currentRange;
    par2 = currentRange/lambda0;
    par3 = 1.+par2;
    if(tPathLength < currentRange) {
      zPathLength = 
        (1.-G4Exp(par3*G4Log(1.-tPathLength/currentRange)))/(par1*par3);
    } else {
      zPathLength = 1./(par1*par3);
    }
 
  } else {
    G4double rfin = std::max(currentRange-tPathLength, 0.01*currentRange);
    G4double T1 = GetEnergy(particle,rfin,couple);
    G4double lambda1 = GetTransportMeanFreePath(particle,T1);
 
    par1 = (lambda0-lambda1)/(lambda0*tPathLength);
    //G4cout << "par1= " << par1 << " L1= " << lambda1 << G4endl;
    par2 = 1./(par1*lambda0);
    par3 = 1.+par2;
    zPathLength = (1.-G4Exp(par3*G4Log(lambda1/lambda0)))/(par1*par3);
  }
 
  zPathLength = std::min(zPathLength, lambda0);
  //G4cout<< "zPathLength= "<< zPathLength<< " L0= " << lambda0 << G4endl;
  return zPathLength;
}

◆ ComputeTheta0()

G4double G4UrbanMscModel::ComputeTheta0	(	G4double	truePathLength,
		G4double	KineticEnergy )

Definition at line 972 of file G4UrbanMscModel.cc.

{
  // for all particles take the width of the central part
  //  from a  parametrization similar to the Highland formula
  // ( Highland formula: Particle Physics Booklet, July 2002, eq. 26.10)
  G4double invbetacp = (kinEnergy+mass)/(kinEnergy*(kinEnergy+2.*mass));
  if(currentKinEnergy != kinEnergy) {
    invbetacp = std::sqrt(invbetacp*(currentKinEnergy+mass)/
              (currentKinEnergy*(currentKinEnergy+2.*mass)));
  }
  G4double y = trueStepLength/currentRadLength;
 
  if(fPosiCorrection && particle == positron)
  {
    static const G4double xl= 0.6;
    static const G4double xh= 0.9;
    static const G4double e = 113.0;
    G4double corr;
 
    G4double tau = std::sqrt(currentKinEnergy*kinEnergy)/mass;
    G4double x = std::sqrt(tau*(tau+2.)/((tau+1.)*(tau+1.)));
    G4double a = msc[idx]->posa; 
    G4double b = msc[idx]->posb;
    G4double c = msc[idx]->posc; 
    G4double d = msc[idx]->posd;
    if(x < xl) {
      corr = a*(1.-G4Exp(-b*x));  
    } else if(x > xh) {
      corr = c+d*G4Exp(e*(x-1.)); 
    } else {
      G4double yl = a*(1.-G4Exp(-b*xl));
      G4double yh = c+d*G4Exp(e*(xh-1.));
      G4double y0 = (yh-yl)/(xh-xl);
      G4double y1 = yl-y0*xl;
      corr = y0*x+y1;
    }
    //==================================================================
    y *= corr*msc[idx]->pose;
  }
 
  static const G4double c_highland = 13.6*CLHEP::MeV;
  G4double theta0 = c_highland*std::abs(charge)*std::sqrt(y)*invbetacp;
 
  // correction factor from e- scattering data
  theta0 *= (msc[idx]->coeffth1+msc[idx]->coeffth2*G4Log(y));
  return theta0;
}

◆ ComputeTruePathLengthLimit()

G4double G4UrbanMscModel::ComputeTruePathLengthLimit	(	const G4Track &	track,
		G4double &	currentMinimalStep )

overridevirtual

Implements G4VMscModel.

Definition at line 434 of file G4UrbanMscModel.cc.

{
  tPathLength = currentMinimalStep;
  const G4DynamicParticle* dp = track.GetDynamicParticle();
  
  G4StepPoint* sp = track.GetStep()->GetPreStepPoint();
  G4StepStatus stepStatus = sp->GetStepStatus();
  couple = track.GetMaterialCutsCouple();
  SetCurrentCouple(couple); 
  idx = couple->GetIndex();
  currentKinEnergy = dp->GetKineticEnergy();
  currentLogKinEnergy = dp->GetLogKineticEnergy();
  currentRange = GetRange(particle,currentKinEnergy,couple,currentLogKinEnergy);
  lambda0 = GetTransportMeanFreePath(particle,currentKinEnergy,
                                              currentLogKinEnergy);
  tPathLength = std::min(tPathLength,currentRange);
  /*  
  G4cout << "G4Urban::StepLimit tPathLength= " << tPathLength 
  << " range= " <<currentRange<< " lambda= "<<lambda0
            <<G4endl;
  */
  // extreme small step
  if(tPathLength < tlimitminfix) {
    latDisplasment = false;
    return ConvertTrueToGeom(tPathLength, currentMinimalStep);  
  }
 
  presafety = (stepStatus == fGeomBoundary) ? sp->GetSafety()
              : ComputeSafety(sp->GetPosition(), tPathLength);
  
  // stop here if small step or range is less than safety
  if((tPathLength == currentRange && tPathLength < presafety) ||
     tPathLength < tlimitminfix) { 
    latDisplasment = false;   
    return ConvertTrueToGeom(tPathLength, currentMinimalStep); 
  }
 
  // upper limit for the straight line distance the particle can travel
  // for electrons and positrons
  G4double distance = (mass < masslimite) 
    ? currentRange*msc[idx]->doverra
    // for muons, hadrons
    : currentRange*msc[idx]->doverrb;
 
  /*  
  G4cout << "G4Urban::StepLimit tPathLength= " 
            <<tPathLength<<" safety= " << presafety
          << " range= " <<currentRange<< " lambda= "<<lambda0
            << " Alg: " << steppingAlgorithm <<G4endl;
  */
  // far from geometry boundary
  if(distance < presafety)
    {
      latDisplasment = false;   
      return ConvertTrueToGeom(tPathLength, currentMinimalStep);  
    }
 
  latDisplasment = latDisplasmentbackup;
  // ----------------------------------------------------------------
  // distance to boundary 
  if (steppingAlgorithm == fUseDistanceToBoundary)
    {
      //compute geomlimit and presafety 
      geomlimit = ComputeGeomLimit(track, presafety, currentRange);
      /*
        G4cout << "G4Urban::Distance to boundary geomlimit= "
            <<geomlimit<<" safety= " << presafety<<G4endl;
      */
 
      smallstep += 1.;
      insideskin = false;
      tgeom = geombig;
 
      // initialisation at first step and at the boundary
      if(firstStep || (stepStatus == fGeomBoundary))
        {
          rangeinit = currentRange;
          if(!firstStep) { smallstep = 1.; }
 
          //stepmin ~ lambda_elastic
          stepmin = ComputeStepmin();
          skindepth = skin*stepmin;
          tlimitmin = ComputeTlimitmin();
        /* 
          G4cout << "rangeinit= " << rangeinit << " stepmin= " << stepmin
                 << " tlimitmin= " << tlimitmin << " geomlimit= " 
                 << geomlimit <<G4endl;
        */
        }
      // constraint from the geometry
      if((geomlimit < geombig) && (geomlimit > geommin))
        {
          // geomlimit is a geometrical step length
          // transform it to true path length (estimation)
          if(lambda0 > geomlimit) {
            geomlimit = -lambda0*G4Log(1.-geomlimit/lambda0)+tlimitmin;
          }
          tgeom = (stepStatus == fGeomBoundary) ? geomlimit/facgeom
        : facrange*rangeinit + stepmin;
        }
 
      //step limit 
      tlimit = (currentRange > presafety) ?
        std::max(facrange*rangeinit, facsafety*presafety) : currentRange;
 
      //lower limit for tlimit
      tlimit = std::min(std::max(tlimit,tlimitmin), tgeom);
      /*
      G4cout << "tgeom= " << tgeom << " geomlimit= " << geomlimit  
            << " tlimit= " << tlimit << " presafety= " << presafety << G4endl;
      */
      // shortcut
      if((tPathLength < tlimit) && (tPathLength < presafety) &&
         (smallstep > skin) && (tPathLength < geomlimit-0.999*skindepth))
      {
        return ConvertTrueToGeom(tPathLength, currentMinimalStep);   
      }
 
      // step reduction near to boundary
      if(smallstep <= skin)
        {
          tlimit = stepmin;
          insideskin = true;
        }
      else if(geomlimit < geombig)
        {
          if(geomlimit > skindepth)
            {
              tlimit = std::min(tlimit, geomlimit-0.999*skindepth);
            }
          else
            {
              insideskin = true;
              tlimit = std::min(tlimit, stepmin);
            }
        }
 
      tlimit = std::max(tlimit, stepmin); 
 
      // randomise if not 'small' step and step determined by msc
      tPathLength = (tlimit < tPathLength && smallstep > skin && !insideskin) 
        ? std::min(tPathLength, Randomizetlimit()) 
    : std::min(tPathLength, tlimit);
    }
  // ----------------------------------------------------------------
  // for simulation with or without magnetic field 
  // there no small step/single scattering at boundaries
  else if(steppingAlgorithm == fUseSafety)
    {
      if(firstStep || (stepStatus == fGeomBoundary)) {
        rangeinit = currentRange;
        fr = facrange;
        // stepping for e+/e- only (not for muons,hadrons)
        if(mass < masslimite) 
          {
            rangeinit = std::max(rangeinit, lambda0);
            if(lambda0 > lambdalimit) {
              fr *= (0.75+0.25*lambda0/lambdalimit);
            }
          }
        //lower limit for tlimit
        stepmin = ComputeStepmin();
        tlimitmin = ComputeTlimitmin();
      }
 
      //step limit
      tlimit = (currentRange > presafety) ?
        std::max(fr*rangeinit, facsafety*presafety) : currentRange;
  
      //lower limit for tlimit
      tlimit = std::max(tlimit, tlimitmin); 
     
      // randomise if step determined by msc
      tPathLength = (tlimit < tPathLength) ?
        std::min(tPathLength, Randomizetlimit()) : tPathLength; 
    }
  // ----------------------------------------------------------------
  // for simulation with or without magnetic field 
  // there is small step/single scattering at boundaries
  else if(steppingAlgorithm == fUseSafetyPlus)
    {
      if(firstStep || (stepStatus == fGeomBoundary)) {
        rangeinit = currentRange;
        fr = facrange;
        if(mass < masslimite)
          {
            if(lambda0 > lambdalimit) {
              fr *= (0.84+0.16*lambda0/lambdalimit);
            }
          }
        //lower limit for tlimit
        stepmin = ComputeStepmin();
        tlimitmin = ComputeTlimitmin();
      }
      //step limit
      tlimit = (currentRange > presafety) ?
    std::max(fr*rangeinit, facsafety*presafety) : currentRange;
 
      //lower limit for tlimit
      tlimit = std::max(tlimit, tlimitmin);
 
      // condition for tPathLength from drr and finalr
      if(currentRange > finalr) {
        G4double tmax = drr*currentRange+
                        finalr*(1.-drr)*(2.-finalr/currentRange);
        tPathLength = std::min(tPathLength,tmax); 
      }
 
      // randomise if step determined by msc
      tPathLength = (tlimit < tPathLength) ?
        std::min(tPathLength, Randomizetlimit()) : tPathLength; 
    }
 
  // ----------------------------------------------------------------
  // simple step limitation
  else
    {
      if (stepStatus == fGeomBoundary)
        {
          tlimit = (currentRange > lambda0) 
        ? facrange*currentRange : facrange*lambda0;
          tlimit = std::max(tlimit, tlimitmin);
        }
      // randomise if step determined by msc
      tPathLength = (tlimit < tPathLength) ?
        std::min(tPathLength, Randomizetlimit()) : tPathLength; 
    }
 
  // ----------------------------------------------------------------
  firstStep = false; 
  return ConvertTrueToGeom(tPathLength, currentMinimalStep);
}

◆ ComputeTrueStepLength()

G4double G4UrbanMscModel::ComputeTrueStepLength ( G4double geomStepLength )

overridevirtual

Implements G4VMscModel.

Definition at line 732 of file G4UrbanMscModel.cc.

{
  // step defined other than transportation 
  if(geomStepLength == zPathLength) { 
    //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength 
    //           << " step= " << geomStepLength << " *** " << G4endl;
    return tPathLength; 
  }
 
  zPathLength = geomStepLength;
 
  // t = z for very small step
  if(geomStepLength < tlimitminfix2) { 
    tPathLength = geomStepLength; 
  
  // recalculation
  } else {
 
    G4double tlength = geomStepLength;
    if((geomStepLength > lambda0*tausmall) && !insideskin) {
 
      if(par1 <  0.) {
        tlength = -lambda0*G4Log(1.-geomStepLength/lambda0) ;
      } else {
        const G4double par4 = par1*par3;
        if(par4*geomStepLength < 1.) {
          tlength = (1.-G4Exp(G4Log(1.-par4*geomStepLength)/par3))/par1;
        } else {
          tlength = currentRange;
        }
      }
 
      if(tlength < geomStepLength)   { tlength = geomStepLength; }
      else if(tlength > tPathLength) { tlength = tPathLength; }
    }  
    tPathLength = tlength; 
  }
  //G4cout << "Urban::ComputeTrueLength: tPathLength= " << tPathLength 
  //         << " step= " << geomStepLength << " &&& " << G4endl;
 
  return tPathLength;
}

◆ Initialise()

void G4UrbanMscModel::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &	)

overridevirtual

Implements G4VEmModel.

Definition at line 134 of file G4UrbanMscModel.cc.

{
  // set values of some data members
  SetParticle(p);
  fParticleChange = GetParticleChangeForMSC(p);
  InitialiseParameters(p);
 
  latDisplasmentbackup = latDisplasment;
 
  // if model is locked parameters should be defined via Set methods
  if(!IsLocked()) {
    dispAlg96 = G4EmParameters::Instance()->LateralDisplacementAlg96();
    fPosiCorrection = G4EmParameters::Instance()->MscPositronCorrection();
  }
 
  // initialise cache only once
  if(0 == msc.size()) {
    G4AutoLock l(&theUrbanMutex);
    if(0 == msc.size()) {
      isFirstInstance = true;
      msc.resize(1, nullptr);
    }
    l.unlock();
  }
  // initialise cache for each new run
  if(isFirstInstance) { InitialiseModelCache(); }
 
  /*
  G4cout << "### G4UrbanMscModel::Initialise done for " 
     << p->GetParticleName() << " type= " << steppingAlgorithm << G4endl;
  G4cout << "    RangeFact= " << facrange << " GeomFact= " << facgeom
     << " SafetyFact= " << facsafety << " LambdaLim= " << lambdalimit
     << G4endl;
  */
}

◆ operator=()

G4UrbanMscModel & G4UrbanMscModel::operator= ( const G4UrbanMscModel & right )

delete

◆ SampleScattering()

G4ThreeVector & G4UrbanMscModel::SampleScattering	(	const G4ThreeVector &	oldDirection,
		G4double	safety )

overridevirtual

Implements G4VMscModel.

Definition at line 778 of file G4UrbanMscModel.cc.

{
  fDisplacement.set(0.0,0.0,0.0);
  if(tPathLength >= currentRange) { return fDisplacement; }
 
  G4double kinEnergy = currentKinEnergy;
  if (tPathLength > currentRange*dtrl) {
    kinEnergy = GetEnergy(particle,currentRange-tPathLength,couple);
  } else if(tPathLength > currentRange*0.01) {
    kinEnergy -= tPathLength*GetDEDX(particle,currentKinEnergy,couple,
                                     currentLogKinEnergy);
  }
 
  if((tPathLength <= tlimitminfix) || (tPathLength < tausmall*lambda0) || 
     (kinEnergy <= CLHEP::eV)) { return fDisplacement; }
 
  G4double cth = SampleCosineTheta(tPathLength,kinEnergy);
 
  // protection against 'bad' cth values
  if(std::abs(cth) >= 1.0) { return fDisplacement; } 
 
  G4double sth = std::sqrt((1.0 - cth)*(1.0 + cth));
  G4double phi = CLHEP::twopi*rndmEngineMod->flat();
  G4ThreeVector newDirection(sth*std::cos(phi),sth*std::sin(phi),cth);
  newDirection.rotateUz(oldDirection);
 
  fParticleChange->ProposeMomentumDirection(newDirection);
  /*
  G4cout << "G4UrbanMscModel::SampleSecondaries: e(MeV)= " << kineticEnergy
         << " sinTheta= " << sth << " safety(mm)= " << safety
         << " trueStep(mm)= " << tPathLength
         << " geomStep(mm)= " << zPathLength
         << G4endl;
  */
 
  if (latDisplasment && currentTau >= tausmall) {
    if(dispAlg96) { SampleDisplacement(sth, phi); }
    else          { SampleDisplacementNew(cth, phi); }
    fDisplacement.rotateUz(oldDirection);
  }
  return fDisplacement;
}

◆ SetDisplacementAlgorithm96()

void G4UrbanMscModel::SetDisplacementAlgorithm96 ( const G4bool val )

inline

Definition at line 268 of file G4UrbanMscModel.hh.

{
  dispAlg96 = val;
}

◆ SetPositronCorrection()

void G4UrbanMscModel::SetPositronCorrection ( const G4bool val )

inline

Definition at line 275 of file G4UrbanMscModel.hh.

{
  fPosiCorrection = val;
}

◆ StartTracking()

void G4UrbanMscModel::StartTracking ( G4Track * track )

overridevirtual

Reimplemented from G4VEmModel.

Definition at line 419 of file G4UrbanMscModel.cc.

{
  SetParticle(track->GetDynamicParticle()->GetDefinition());
  firstStep = true; 
  insideskin = false;
  fr = facrange;
  tlimit = tgeom = rangeinit = geombig;
  smallstep     = 1.e10;
  stepmin       = tlimitminfix;
  tlimitmin     = 10.*tlimitminfix;            
  rndmEngineMod = G4Random::getTheEngine();
}

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ G4UrbanMscModel() [1/2]

◆ ~G4UrbanMscModel()

◆ G4UrbanMscModel() [2/2]

Member Function Documentation

◆ ComputeCrossSectionPerAtom()

◆ ComputeGeomPathLength()

◆ ComputeTheta0()

◆ ComputeTruePathLengthLimit()

◆ ComputeTrueStepLength()

◆ Initialise()

◆ operator=()

◆ SampleScattering()

◆ SetDisplacementAlgorithm96()

◆ SetPositronCorrection()

◆ StartTracking()