UrbanMscModel93 Class Reference

#include <UrbanMscModel93.h>

Inheritance diagram for UrbanMscModel93:

Public Member Functions
G4double	ComputeCrossSectionPerAtom (const G4ParticleDefinition *particle, G4double KineticEnergy, G4double AtomicNumber, G4double AtomicWeight=0., G4double cut=0., G4double emax=DBL_MAX)
G4double	ComputeGeomPathLength (G4double truePathLength)
G4double	ComputeTheta0 (G4double truePathLength, G4double KineticEnergy)
G4double	ComputeTruePathLengthLimit (const G4Track &track, G4double &currentMinimalStep)
G4double	ComputeTrueStepLength (G4double geomStepLength)
void	Initialise (const G4ParticleDefinition *, const G4DataVector &)
G4ThreeVector &	SampleScattering (const G4ThreeVector &, G4double safety)
void	StartTracking (G4Track *)
	UrbanMscModel93 (const G4String &nam="UrbanMsc93")
virtual	~UrbanMscModel93 ()

Private Member Functions
G4double	LatCorrelation ()
UrbanMscModel93 &	operator= (const UrbanMscModel93 &right)
G4double	SampleCosineTheta (G4double trueStepLength, G4double KineticEnergy)
G4double	SampleDisplacement ()
void	SetParticle (const G4ParticleDefinition *)
G4double	SimpleScattering (G4double xmeanth, G4double x2meanth)
void	UpdateCache ()
	UrbanMscModel93 (const UrbanMscModel93 &)

Private Attributes
G4double	charge
G4double	ChargeSquare
G4double	coeffc1
G4double	coeffc2
G4double	coeffth1
G4double	coeffth2
const G4MaterialCutsCouple *	couple
G4double	currentKinEnergy
G4int	currentMaterialIndex
G4double	currentRadLength
G4double	currentRange
G4double	currentTau
G4double	ea
G4double	eaa
G4bool	firstStep
G4ParticleChangeForMSC *	fParticleChange
G4double	fr
G4double	geombig
G4double	geomlimit
G4double	geommin
G4bool	inside
G4bool	insideskin
G4double	lambda0
G4double	lambdaeff
G4double	lambdalimit
G4double	lnZ
G4double	mass
G4double	masslimite
G4double	numlim
G4double	par1
G4double	par2
G4double	par3
const G4ParticleDefinition *	particle
G4double	presafety
G4double	rangeinit
G4double	rellossmax
G4double	scr1
G4double	scr1ini
G4double	scr2
G4double	scr2ini
G4double	skindepth
G4double	smallstep
G4double	stepmin
G4double	taubig
G4double	taulim
G4double	tausmall
G4double	tgeom
G4LossTableManager *	theManager
G4double	theta0max
G4double	third
G4double	tlimit
G4double	tlimitmin
G4double	tlimitminfix
G4double	tPathLength
G4double	xsi
G4double	y
G4double	Z2
G4double	Z23
G4double	Zeff
G4double	Zold
G4double	zPathLength

Detailed Description

Definition at line 69 of file UrbanMscModel93.h.

Constructor & Destructor Documentation

UrbanMscModel93::UrbanMscModel93

(

const G4String &

nam = "UrbanMsc93"

)

Definition at line 76 of file UrbanMscModel93.cc.

References charge, ChargeSquare, coeffc1, coeffc2, coeffth1, coeffth2, couple, currentKinEnergy, currentMaterialIndex, currentRadLength, currentRange, currentTau, ea, eaa, firstStep, fParticleChange, fr, geombig, geomlimit, geommin, inside, insideskin, lambda0, lambdaeff, lambdalimit, lnZ, mass, masslimite, MeV, numlim, par1, par2, par3, particle, pi, presafety, rangeinit, rellossmax, scr1, scr1ini, scr2, scr2ini, skindepth, smallstep, stepmin, taubig, taulim, tausmall, tgeom, theManager, theta0max, third, tlimit, tlimitmin, tlimitminfix, tPathLength, xsi, y, Z2, Z23, Zeff, Zold, and zPathLength.

  : G4VMscModel(nam)
{
  masslimite    = 0.6*MeV;
  lambdalimit   = 1.*mm;
  fr            = 0.02;
  taubig        = 8.0;
  tausmall      = 1.e-16;
  taulim        = 1.e-6;
  currentTau    = taulim;
  tlimitminfix  = 1.e-6*mm;            
  stepmin       = tlimitminfix;
  smallstep     = 1.e10;
  currentRange  = 0. ;
  rangeinit     = 0.;
  tlimit        = 1.e10*mm;
  tlimitmin     = 10.*tlimitminfix;            
  tgeom         = 1.e50*mm;
  geombig       = 1.e50*mm;
  geommin       = 1.e-3*mm;
  geomlimit     = geombig;
  presafety     = 0.*mm;
                          
  y             = 0.;

  Zold          = 0.;
  Zeff          = 1.;
  Z2            = 1.;                
  Z23           = 1.;                    
  lnZ           = 0.;
  coeffth1      = 0.;
  coeffth2      = 0.;
  coeffc1       = 0.;
  coeffc2       = 0.;
  scr1ini       = fine_structure_const*fine_structure_const*
                  electron_mass_c2*electron_mass_c2/(0.885*0.885*4.*pi);
  scr2ini       = 3.76*fine_structure_const*fine_structure_const;
  scr1          = 0.;
  scr2          = 0.;

  theta0max     = pi/6.;
  rellossmax    = 0.50;
  third         = 1./3.;
  particle      = 0;
  theManager    = G4LossTableManager::Instance(); 
  firstStep     = true; 
  inside        = false;  
  insideskin    = false;

  numlim        = 0.01;
  xsi           = 3.;
  ea            = G4Exp(-xsi);
  eaa           = 1.-ea ;

  skindepth = skin*stepmin;

  mass = proton_mass_c2;
  charge = ChargeSquare = 1.0;
  currentKinEnergy = currentRadLength = lambda0 = lambdaeff = tPathLength 
    = zPathLength = par1 = par2 = par3 = 0;

  currentMaterialIndex = -1;
  fParticleChange = 0;
  couple = 0;
  SetSampleZ(false);
}

UrbanMscModel93::~UrbanMscModel93 ( )

virtual

Definition at line 145 of file UrbanMscModel93.cc.

{}

UrbanMscModel93::UrbanMscModel93 ( const UrbanMscModel93 &  )

private

Member Function Documentation

G4double UrbanMscModel93::ComputeCrossSectionPerAtom	(	const G4ParticleDefinition *	particle,
		G4double	KineticEnergy,
		G4double	AtomicNumber,
		G4double	AtomicWeight = 0.,
		G4double	cut = 0.,
		G4double	emax = DBL_MAX
	)

Definition at line 170 of file UrbanMscModel93.cc.

References EnergyCorrector::c, alignmentValidation::c1, counter::c2, charge, ChargeSquare, corr, hbarc, mass, MeV, funct::pow(), SetParticle(), mathSSE::sqrt(), pat::TAU, metsig::tau, w, and Z23.

{
  static const G4double sigmafactor = 
    twopi*classic_electr_radius*classic_electr_radius;
  static const G4double epsfactor = 2.*electron_mass_c2*electron_mass_c2*
                            Bohr_radius*Bohr_radius/(hbarc*hbarc);
  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. };

  static const G4double Tdat[22] = { 100*eV,  200*eV,  400*eV,  700*eV,
                     1*keV,   2*keV,   4*keV,   7*keV,
                     10*keV,  20*keV,  40*keV,  70*keV,
                     100*keV, 200*keV, 400*keV, 700*keV,
                     1*MeV,   2*MeV,   4*MeV,   7*MeV,
                     10*MeV,  20*MeV};

  // 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 Tlim = 10.*MeV;
  static const G4double beta2lim = Tlim*(Tlim+2.*electron_mass_c2)/
                      ((Tlim+electron_mass_c2)*(Tlim+electron_mass_c2));
  static const G4double bg2lim   = Tlim*(Tlim+2.*electron_mass_c2)/
                      (electron_mass_c2*electron_mass_c2);

  static const G4double sig0[15] = {
                     0.2672*barn,  0.5922*barn, 2.653*barn,  6.235*barn,
                      11.69*barn  , 13.24*barn  , 16.12*barn, 23.00*barn ,
              35.13*barn  , 39.95*barn  , 50.85*barn, 67.19*barn ,
                      91.15*barn  , 104.4*barn  , 113.1*barn};
                           
  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);

  Z23 = pow(AtomicNumber,2./3.); 

  // correction if particle .ne. e-/e+
  // compute equivalent kinetic energy
  // lambda depends on p*beta ....

  G4double eKineticEnergy = KineticEnergy;

  if(mass > electron_mass_c2)
  {
     G4double TAU = KineticEnergy/mass ;
     G4double c = mass*TAU*(TAU+2.)/(electron_mass_c2*(TAU+1.)) ;
     G4double w = c-2. ;
     G4double tau = 0.5*(w+sqrt(w*w+4.*c)) ;
     eKineticEnergy = electron_mass_c2*tau ;
  }

  G4double eTotalEnergy = eKineticEnergy + electron_mass_c2 ;
  G4double beta2 = eKineticEnergy*(eTotalEnergy+electron_mass_c2)
                                 /(eTotalEnergy*eTotalEnergy);
  G4double bg2   = eKineticEnergy*(eTotalEnergy+electron_mass_c2)
                                 /(electron_mass_c2*electron_mass_c2);

  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,cc2,corr;

  // get bin number in Z
  G4int iZ = 14;
  while ((iZ>=0)&&(Zdat[iZ]>=AtomicNumber)) iZ -= 1;
  if (iZ==14)                               iZ = 13;
  if (iZ==-1)                               iZ = 0 ;

  G4double ZZ1 = Zdat[iZ];
  G4double ZZ2 = Zdat[iZ+1];
  G4double ratZ = (AtomicNumber-ZZ1)*(AtomicNumber+ZZ1)/
                  ((ZZ2-ZZ1)*(ZZ2+ZZ1));

  if(eKineticEnergy <= Tlim) 
  {
    // get bin number in T (beta2)
    G4int iT = 21;
    while ((iT>=0)&&(Tdat[iT]>=eKineticEnergy)) iT -= 1;
    if(iT==21)                                  iT = 20;
    if(iT==-1)                                  iT = 0 ;

    //  calculate betasquare values
    G4double T = Tdat[iT],   E = T + electron_mass_c2;
    G4double b2small = T*(E+electron_mass_c2)/(E*E);

    T = Tdat[iT+1]; E = T + electron_mass_c2;
    G4double b2big = T*(E+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];
       cc2 = c1+ratZ*(c2-c1);

       corr = cc1+ratb2*(cc2-cc1);

       sigma *= sigmafactor/corr;
    }
    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];
       cc2 = c1+ratZ*(c2-c1);

       corr = cc1+ratb2*(cc2-cc1);

       sigma *= sigmafactor/corr;
    }
  }
  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);
  }
  return sigma;

}

G4double UrbanMscModel93::ComputeGeomPathLength

(

G4double

truePathLength

)

Definition at line 645 of file UrbanMscModel93.cc.

References couple, currentKinEnergy, currentRange, firstStep, insideskin, lambda0, lambdaeff, mass, par1, par2, par3, particle, stepmin, metsig::tau, taulim, tausmall, third, tlimitminfix, tPathLength, and zPathLength.

{
  firstStep = false; 
  lambdaeff = lambda0;
  par1 = -1. ;  
  par2 = par3 = 0. ;  

  //  do the true -> geom transformation
  zPathLength = tPathLength;

  // z = t for very small tPathLength
  if(tPathLength < tlimitminfix) return zPathLength;

  // this correction needed to run MSC with eIoni and eBrem inactivated
  // and makes no harm for a normal run
  if(tPathLength > currentRange)
    tPathLength = currentRange ;

  G4double tau   = tPathLength/lambda0 ;

  if ((tau <= tausmall) || insideskin) {
    zPathLength  = tPathLength;
    if(zPathLength > lambda0) zPathLength = lambda0;
    return zPathLength;
  }

  G4double zmean = tPathLength;
  if (tPathLength < currentRange*dtrl) {
    if(tau < taulim) zmean = tPathLength*(1.-0.5*tau) ;
    else             zmean = lambda0*(1.-G4Exp(-tau));
  } else if(currentKinEnergy < mass || tPathLength == currentRange)  {
    par1 = 1./currentRange ;
    par2 = 1./(par1*lambda0) ;
    par3 = 1.+par2 ;
    if(tPathLength < currentRange)
      zmean = (1.-G4Exp(par3*G4Log(1.-tPathLength/currentRange)))/(par1*par3) ;
    else
      zmean = 1./(par1*par3) ;
  } else {
    G4double T1 = GetEnergy(particle,currentRange-tPathLength,couple);
    G4double lambda1 = GetTransportMeanFreePath(particle,T1);

    par1 = (lambda0-lambda1)/(lambda0*tPathLength) ;
    par2 = 1./(par1*lambda0) ;
    par3 = 1.+par2 ;
    zmean = (1.-G4Exp(par3*G4Log(lambda1/lambda0)))/(par1*par3) ;
  }

  zPathLength = zmean ;

  //  sample z
  if(samplez)
  {
    const G4double  ztmax = 0.99 ;
    G4double zt = zmean/tPathLength ;

    if (tPathLength > stepmin && zt < ztmax)              
    {
      G4double u,cz1;
      if(zt >= third)
      {
        G4double cz = 0.5*(3.*zt-1.)/(1.-zt) ;
        cz1 = 1.+cz ;
        G4double u0 = cz/cz1 ;
        G4double grej ;
        do {
            u = G4Exp(G4Log(G4UniformRand())/cz1) ;
            grej = G4Exp(cz*G4Log(u/u0))*(1.-u)/(1.-u0) ;
           } while (grej < G4UniformRand()) ;
      }
      else
      {
        cz1 = 1./zt-1.;
        u = 1.-G4Exp(G4Log(G4UniformRand())/cz1) ;
      }
      zPathLength = tPathLength*u ;
    }
  }

  if(zPathLength > lambda0) zPathLength = lambda0;
  //G4cout << "zPathLength= " << zPathLength << " lambda1= " << lambda0 << G4endl;
  return zPathLength;
}

G4double UrbanMscModel93::ComputeTheta0 ( G4double  truePathLength, G4double  KineticEnergy  )

inline

Definition at line 217 of file UrbanMscModel93.h.

References funct::abs(), charge, coeffth1, coeffth2, currentKinEnergy, currentRadLength, mass, MeV, mathSSE::sqrt(), and y.

Referenced by SampleCosineTheta().

{
  // 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)
  static const G4double c_highland = 13.6*CLHEP::MeV;
  G4double invbetacp = sqrt((currentKinEnergy+mass)*(KineticEnergy+mass)/
                (currentKinEnergy*(currentKinEnergy+2.*mass)*
                 KineticEnergy*(KineticEnergy+2.*mass)));
  y = trueStepLength/currentRadLength;
  G4double theta0 = c_highland*std::abs(charge)*sqrt(y)*invbetacp;
  // correction factor from e- scattering data
  theta0 *= (coeffth1+coeffth2*G4Log(y));             

  return theta0;
}

G4double UrbanMscModel93::ComputeTruePathLengthLimit	(	const G4Track &	track,
		G4double &	currentMinimalStep
	)

Definition at line 428 of file UrbanMscModel93.cc.

References couple, currentKinEnergy, currentMaterialIndex, currentRange, firstStep, fr, geombig, geomlimit, geommin, inside, insideskin, lambda0, lambdalimit, mass, masslimite, MeV, particle, presafety, rangeinit, skindepth, smallstep, stepmin, tgeom, tlimit, tlimitmin, tlimitminfix, and tPathLength.

{
  tPathLength = currentMinimalStep;
  const G4DynamicParticle* dp = track.GetDynamicParticle();
  G4StepPoint* sp = track.GetStep()->GetPreStepPoint();
  G4StepStatus stepStatus = sp->GetStepStatus();
  couple = track.GetMaterialCutsCouple();
  SetCurrentCouple(couple); 
  currentMaterialIndex = couple->GetIndex();
  currentKinEnergy = dp->GetKineticEnergy();
  currentRange = GetRange(particle,currentKinEnergy,couple);
  lambda0 = GetTransportMeanFreePath(particle,currentKinEnergy);

  // stop here if small range particle
  if(inside || tPathLength < tlimitminfix) { 
    return ConvertTrueToGeom(tPathLength, currentMinimalStep); 
  } 
  
  if(tPathLength > currentRange) { tPathLength = currentRange; }

  presafety = sp->GetSafety();

  // G4cout << "Urban2::StepLimit tPathLength= " 
  //     <<tPathLength<<" safety= " << presafety
  //        << " range= " <<currentRange<< " lambda= "<<lambda0
  //     << " Alg: " << steppingAlgorithm <<G4endl;

  // far from geometry boundary
  if(currentRange < presafety)
    {
      inside = true;
      return ConvertTrueToGeom(tPathLength, currentMinimalStep);  
    }

  // standard  version
  //
  if (steppingAlgorithm == fUseDistanceToBoundary)
    {
      //compute geomlimit and presafety 
      geomlimit = ComputeGeomLimit(track, presafety, currentRange);

      // is it far from boundary ?
      if(currentRange < presafety)
    {
      inside = true;
      return ConvertTrueToGeom(tPathLength, currentMinimalStep);   
    }

      smallstep += 1.;
      insideskin = false;

      if(firstStep || stepStatus == fGeomBoundary)
        {
          rangeinit = currentRange;
          if(firstStep) smallstep = 1.e10;
          else  smallstep = 1.;

          //define stepmin here (it depends on lambda!)
          //rough estimation of lambda_elastic/lambda_transport
          G4double rat = currentKinEnergy/MeV ;
          rat = 1.e-3/(rat*(10.+rat)) ;
          //stepmin ~ lambda_elastic
          stepmin = rat*lambda0;
          skindepth = skin*stepmin;
          //define tlimitmin
          tlimitmin = 10.*stepmin;
          if(tlimitmin < tlimitminfix) tlimitmin = tlimitminfix;
      //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((1.-geomlimit/lambda0) > 0.)
                geomlimit = -lambda0*G4Log(1.-geomlimit/lambda0)+tlimitmin ;

              if(stepStatus == fGeomBoundary)
                tgeom = geomlimit/facgeom;
              else
                tgeom = 2.*geomlimit/facgeom;
            }
            else
              tgeom = geombig;
        }


      //step limit 
      tlimit = facrange*rangeinit;              
      if(tlimit < facsafety*presafety)
        tlimit = facsafety*presafety; 

      //lower limit for tlimit
      if(tlimit < tlimitmin) tlimit = tlimitmin;

      if(tlimit > tgeom) tlimit = 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)
        {
          if(tlimit > geomlimit-0.999*skindepth)
        tlimit = geomlimit-0.999*skindepth;
        }
      else
        {
          insideskin = true;
          if(tlimit > stepmin) tlimit = stepmin;
        }
    }

      if(tlimit < stepmin) tlimit = stepmin;

      // randomize 1st step or 1st 'normal' step in volume
      if(firstStep || ((smallstep == skin) && !insideskin)) 
        { 
          G4double temptlimit = tlimit;
          if(temptlimit > tlimitmin)
          {
            do {
              temptlimit = G4RandGauss::shoot(tlimit,0.3*tlimit);        
               } while ((temptlimit < tlimitmin) || 
                        (temptlimit > 2.*tlimit-tlimitmin));
          }
          else
            temptlimit = tlimitmin;
          if(tPathLength > temptlimit) tPathLength = temptlimit;
        }
      else
        {  
          if(tPathLength > tlimit) tPathLength = tlimit  ; 
        }

    }
    // for 'normal' simulation with or without magnetic field 
    //  there no small step/single scattering at boundaries
  else if(steppingAlgorithm == fUseSafety)
    {
      // compute presafety again if presafety <= 0 and no boundary
      // i.e. when it is needed for optimization purposes
      if((stepStatus != fGeomBoundary) && (presafety < tlimitminfix)) 
    presafety = ComputeSafety(sp->GetPosition(),tPathLength); 

      // is far from boundary
      if(currentRange < presafety)
        {
          inside = true;
          return ConvertTrueToGeom(tPathLength, currentMinimalStep);  
        }

      if(firstStep || stepStatus == fGeomBoundary)
      {
        rangeinit = currentRange;
        fr = facrange;
        // 9.1 like stepping for e+/e- only (not for muons,hadrons)
        if(mass < masslimite) 
        {
          if(lambda0 > currentRange)
            rangeinit = lambda0;
          if(lambda0 > lambdalimit)
            fr *= 0.75+0.25*lambda0/lambdalimit;
        }

        //lower limit for tlimit
        G4double rat = currentKinEnergy/MeV ;
        rat = 1.e-3/(rat*(10.+rat)) ;
        tlimitmin = 10.*lambda0*rat;
        if(tlimitmin < tlimitminfix) tlimitmin = tlimitminfix;
      }
      //step limit
      tlimit = fr*rangeinit;               

      if(tlimit < facsafety*presafety)
        tlimit = facsafety*presafety;

      //lower limit for tlimit
      if(tlimit < tlimitmin) tlimit = tlimitmin;
      
      if(tPathLength > tlimit) tPathLength = tlimit;

    }
  
  // version similar to 7.1 (needed for some experiments)
  else
    {
      if (stepStatus == fGeomBoundary)
    {
      if (currentRange > lambda0) tlimit = facrange*currentRange;
      else                        tlimit = facrange*lambda0;

      if(tlimit < tlimitmin) tlimit = tlimitmin;
      if(tPathLength > tlimit) tPathLength = tlimit;
    }
    }
  //G4cout << "tPathLength= " << tPathLength 
  //     << " currentMinimalStep= " << currentMinimalStep << G4endl;
  return ConvertTrueToGeom(tPathLength, currentMinimalStep);
}

G4double UrbanMscModel93::ComputeTrueStepLength

(

G4double

geomStepLength

)

Definition at line 731 of file UrbanMscModel93.cc.

References currentRange, insideskin, lambda0, par1, par3, tausmall, tlimitminfix, tPathLength, and zPathLength.

{
  // step defined other than transportation 
  if(geomStepLength == zPathLength && tPathLength <= currentRange)
    return tPathLength;

  // t = z for very small step
  zPathLength = geomStepLength;
  tPathLength = geomStepLength;
  if(geomStepLength < tlimitminfix) return tPathLength;
  
  // recalculation
  if((geomStepLength > lambda0*tausmall) && !insideskin)
  {
    if(par1 <  0.)
      tPathLength = -lambda0*G4Log(1.-geomStepLength/lambda0) ;
    else 
    {
      if(par1*par3*geomStepLength < 1.)
        tPathLength = (1.-G4Exp(G4Log(1.-par1*par3*geomStepLength)/par3))/par1 ;
      else 
        tPathLength = currentRange;
    }  
  }
  if(tPathLength < geomStepLength) tPathLength = geomStepLength;

  //G4cout << "tPathLength= " << tPathLength << " step= " << geomStepLength << G4endl;

  return tPathLength;
}

void UrbanMscModel93::Initialise	(	const G4ParticleDefinition *	p,
		const G4DataVector &
	)

Definition at line 150 of file UrbanMscModel93.cc.

References fParticleChange, MeV, SetParticle(), skindepth, and stepmin.

{
  skindepth = skin*stepmin;

  // set values of some data members
  SetParticle(p);

  if(p->GetPDGMass() > MeV) {
    G4cout << "### WARNING: UrbanMscModel93 model is used for " 
       << p->GetParticleName() << " !!! " << G4endl;
    G4cout << "###          This model should be used only for e+-" 
       << G4endl;
  }

  fParticleChange = GetParticleChangeForMSC(p);
}

G4double UrbanMscModel93::LatCorrelation ( )

private

Definition at line 1102 of file UrbanMscModel93.cc.

References currentTau, insideskin, kappa, kappami1, kappapl1, lambdaeff, taubig, taulim, tausmall, and third.

Referenced by SampleScattering().

{
  G4double latcorr = 0.;
  if((currentTau >= tausmall) && !insideskin)
  {
    if(currentTau < taulim)
      latcorr = lambdaeff*kappa*currentTau*currentTau*
                (1.-kappapl1*currentTau*third)*third;
    else
    {
      G4double etau = 0.;
      if(currentTau < taubig) etau = G4Exp(-currentTau);
      latcorr = -kappa*currentTau;
      latcorr = G4Exp(latcorr)/kappami1;
      latcorr += 1.-kappa*etau/kappami1 ;
      latcorr *= 2.*lambdaeff*third ;
    }
  }

  return latcorr;
}

UrbanMscModel93& UrbanMscModel93::operator= ( const UrbanMscModel93 &  right )

private

G4double UrbanMscModel93::SampleCosineTheta ( G4double  trueStepLength, G4double  KineticEnergy  )

private

Definition at line 856 of file UrbanMscModel93.cc.

References b, EnergyCorrector::c, alignmentValidation::c1, coeffc1, coeffc2, ComputeTheta0(), funct::cos(), couple, currentKinEnergy, currentRadLength, currentRange, currentTau, ztail::d, ea, eaa, GeV, i, insideskin, lambda0, lambdaeff, mass, timingPdfMaker::mean, gen::n, numlim, par1, par2, phi, funct::pow(), rellossmax, scr1, scr2, SimpleScattering(), funct::sin(), mathSSE::sqrt(), stepmin, metsig::tau, taubig, taulim, tausmall, theta0max, third, UpdateCache(), MetTreeProducer::var(), x, xsi, y, Zeff, and Zold.

Referenced by SampleScattering().

{
  G4double cth = 1. ;
  G4double tau = trueStepLength/lambda0 ;

  Zeff = couple->GetMaterial()->GetTotNbOfElectPerVolume()/
         couple->GetMaterial()->GetTotNbOfAtomsPerVolume() ;

  if(Zold != Zeff)  
    UpdateCache();

  if(insideskin)
  {
    //no scattering, single or plural scattering
    G4double mean = trueStepLength/stepmin ;

    G4int n = G4Poisson(mean);
    if(n > 0)
    {
      //screening (Moliere-Bethe)
      G4double mom2 = KineticEnergy*(2.*mass+KineticEnergy);
      G4double beta2 = mom2/((KineticEnergy+mass)*(KineticEnergy+mass));
      G4double ascr = scr1/mom2;
      ascr *= 1.13+scr2/beta2;
      G4double ascr1 = 1.+2.*ascr;
      G4double bp1=ascr1+1.;
      G4double bm1=ascr1-1.;

      // single scattering from screened Rutherford x-section
      G4double ct,st,phi;
      G4double sx=0.,sy=0.,sz=0.;
      for(G4int i=1; i<=n; i++)
      {
        ct = ascr1-bp1*bm1/(2.*G4UniformRand()+bm1);
        if(ct < -1.) ct = -1.;
        if(ct >  1.) ct =  1.; 
        st = sqrt(1.-ct*ct);
        phi = twopi*G4UniformRand();
        sx += st*cos(phi);
        sy += st*sin(phi);
        sz += ct;
      }
      cth = sz/sqrt(sx*sx+sy*sy+sz*sz);
    }
  }
  else
  {
    if(trueStepLength >= currentRange*dtrl) 
    {
      if(par1*trueStepLength < 1.)
    tau = -par2*G4Log(1.-par1*trueStepLength) ;
      // for the case if ioni/brems are inactivated
      // see the corresponding condition in ComputeGeomPathLength 
      else if(1.-KineticEnergy/currentKinEnergy > taulim)
    tau = taubig ;
    }
    currentTau = tau ;
    lambdaeff = trueStepLength/currentTau;
    currentRadLength = couple->GetMaterial()->GetRadlen();

    if (tau >= taubig) cth = -1.+2.*G4UniformRand();
    else if (tau >= tausmall)
    {
      G4double xmeanth, x2meanth;
      if(tau < numlim) {
    xmeanth = 1.0 - tau*(1.0 - 0.5*tau);
        x2meanth= 1.0 - tau*(5.0 - 6.25*tau)*third;
      } else {
    xmeanth = G4Exp(-tau);
    x2meanth = (1.+2.*G4Exp(-2.5*tau))*third;
      }
      G4double relloss = 1.-KineticEnergy/currentKinEnergy;

      if(relloss > rellossmax) 
        return SimpleScattering(xmeanth,x2meanth);

      G4double theta0 = ComputeTheta0(trueStepLength,KineticEnergy);

      //G4cout << "Theta0= " << theta0 << " theta0max= " << theta0max 
      //         << "  sqrt(tausmall)= " << sqrt(tausmall) << G4endl;

      // protection for very small angles
      G4double theta2 = theta0*theta0;

      if(theta2 < tausmall) { return cth; }
    
      if(theta0 > theta0max) {
        return SimpleScattering(xmeanth,x2meanth);
      }

      G4double x = theta2*(1.0 - theta2/12.);
      if(theta2 > numlim) {
    G4double sth = 2.*sin(0.5*theta0);
    x = sth*sth;
      }

      G4double xmean1 = 1.-(1.-(1.+xsi)*ea)*x/eaa;
      G4double x0 = 1. - xsi*x;

      // G4cout << " xmean1= " << xmean1 << "  xmeanth= " << xmeanth << G4endl;

      if(xmean1 <= 0.999*xmeanth) {
        return SimpleScattering(xmeanth,x2meanth);
      }
      // from e- and muon scattering data                    
      G4double c = coeffc1+coeffc2*y; 

      // tail should not be too big
      if(c < 1.9) { 
    /*
    if(KineticEnergy > 200*MeV && c < 1.6) {
      G4cout << "UrbanMscModel93::SampleCosineTheta: E(GeV)= " 
         << KineticEnergy/GeV 
         << " !!** c= " << c
         << " **!! length(mm)= " << trueStepLength << " Zeff= " << Zeff 
         << " " << couple->GetMaterial()->GetName()
         << " tau= " << tau << G4endl;
    }
    */
    c = 1.9; 
      }

      if(fabs(c-3.) < 0.001)      { c = 3.001; }
      else if(fabs(c-2.) < 0.001) { c = 2.001; }

      G4double c1 = c-1.;

      //from continuity of derivatives
      G4double b = 1.+(c-xsi)*x;

      G4double b1 = b+1.;
      G4double bx = c*x;

      G4double eb1 = pow(b1,c1);
      G4double ebx = pow(bx,c1);
      G4double d = ebx/eb1;

      // G4double xmean2 = (x0*eb1+ebx-(eb1*bx-b1*ebx)/(c-2.))/(eb1-ebx);
      G4double xmean2 = (x0 + d - (bx - b1*d)/(c-2.))/(1. - d);
      
      G4double f1x0 = ea/eaa;
      G4double f2x0 = c1/(c*(1. - d));
      G4double prob = f2x0/(f1x0+f2x0);

      G4double qprob = xmeanth/(prob*xmean1+(1.-prob)*xmean2);

      // sampling of costheta
      //G4cout << "c= " << c << " qprob= " << qprob << " eb1= " << eb1
      // << " c1= " << c1 << " b1= " << b1 << " bx= " << bx << " eb1= " << eb1
      //         << G4endl;
      if(G4UniformRand() < qprob)
      {
        G4double var = 0;
        if(G4UniformRand() < prob) {
          cth = 1.+G4Log(ea+G4UniformRand()*eaa)*x;
        } else {
          var = (1.0 - d)*G4UniformRand();
          if(var < numlim*d) {
            var /= (d*c1); 
            cth = -1.0 + var*(1.0 - 0.5*var*c)*(2. + (c - xsi)*x);
      } else {
        cth = 1. + x*(c - xsi - c*pow(var + d, -1.0/c1));
        //b-b1*bx/G4Exp(log(ebx+(eb1-ebx)*G4UniformRand())/c1) ;
      }
    }
    if(KineticEnergy > 5*GeV && cth < 0.9) {
      G4cout << "UrbanMscModel93::SampleCosineTheta: E(GeV)= " 
         << KineticEnergy/GeV 
         << " 1-cosT= " << 1 - cth
         << " length(mm)= " << trueStepLength << " Zeff= " << Zeff 
         << " tau= " << tau
         << " prob= " << prob << " var= " << var << G4endl;
      G4cout << "  c= " << c << " qprob= " << qprob << " eb1= " << eb1
         << " ebx= " << ebx
         << " c1= " << c1 << " b= " << b << " b1= " << b1 
         << " bx= " << bx << " d= " << d
         << " ea= " << ea << " eaa= " << eaa << G4endl;
    }
      }
      else {
        cth = -1.+2.*G4UniformRand();
    if(KineticEnergy > 5*GeV) {
      G4cout << "UrbanMscModel93::SampleCosineTheta: E(GeV)= " 
         << KineticEnergy/GeV 
         << " length(mm)= " << trueStepLength << " Zeff= " << Zeff 
         << " qprob= " << qprob << G4endl;
    }
      }
    }
  }  
  return cth ;
}

G4double UrbanMscModel93::SampleDisplacement ( )

private

Definition at line 1052 of file UrbanMscModel93.cc.

References currentTau, insideskin, kappa, kappami1, kappapl1, lambdaeff, mathSSE::sqrt(), taubig, taulim, tausmall, third, tPathLength, and zPathLength.

Referenced by SampleScattering().

{
  // Compute rmean = sqrt(<r**2>) from theory
  G4double rmean = 0.0;
  if ((currentTau >= tausmall) && !insideskin) {
    if (currentTau < taulim) {
      rmean = kappa*currentTau*currentTau*currentTau*
             (1.-kappapl1*currentTau*0.25)/6. ;

    } else {
      G4double etau = 0.0;
      if (currentTau<taubig) etau = G4Exp(-currentTau);
      rmean = -kappa*currentTau;
      rmean = -G4Exp(rmean)/(kappa*kappami1);
      rmean += currentTau-kappapl1/kappa+kappa*etau/kappami1;
    }
    if (rmean>0.) rmean = 2.*lambdaeff*sqrt(rmean*third);
    else          rmean = 0.;
  }

  if(rmean == 0.) return rmean;

  // protection against z > t ...........................
  G4double rmax = (tPathLength-zPathLength)*(tPathLength+zPathLength);
    if(rmax <= 0.)
      rmax = 0.;
    else
      rmax = sqrt(rmax);

  if(rmean >= rmax) return rmax;
     
  return rmean;
  // VI comment out for the time being
  /*
  //sample r (Gaussian distribution with a mean of rmean )
  G4double r = 0.;
  G4double sigma = min(rmean,rmax-rmean);
  sigma /= 3.;
  G4double rlow  = rmean-3.*sigma;
  G4double rhigh = rmean+3.*sigma;
  do {
      r = G4RandGauss::shoot(rmean,sigma);  
     } while ((r < rlow) || (r > rhigh));   

  return r;
  */
}

G4ThreeVector & UrbanMscModel93::SampleScattering	(	const G4ThreeVector &	oldDirection,
		G4double	safety
	)

Definition at line 765 of file UrbanMscModel93.cc.

References funct::abs(), funct::cos(), couple, currentKinEnergy, currentRange, fParticleChange, lambda0, LatCorrelation(), particle, phi, colinearityKinematic::Phi, alignCSCRings::r, SampleCosineTheta(), SampleDisplacement(), funct::sin(), mathSSE::sqrt(), tausmall, tlimitminfix, and tPathLength.

{
  fDisplacement.set(0.0,0.0,0.0);
  G4double kineticEnergy = currentKinEnergy;
  if (tPathLength > currentRange*dtrl) {
    kineticEnergy = GetEnergy(particle,currentRange-tPathLength,couple);
  } else {
    kineticEnergy -= tPathLength*GetDEDX(particle,currentKinEnergy,couple);
  }
  if((kineticEnergy <= eV) || (tPathLength <= tlimitminfix) ||
     (tPathLength/tausmall < lambda0)) { return  fDisplacement; }

  G4double cth  = SampleCosineTheta(tPathLength,kineticEnergy);

  // protection against 'bad' cth values
  if(std::fabs(cth) > 1.) { return  fDisplacement; }

  // extra protection agaist high energy particles backscattered 
  //  if(cth < 1.0 - 1000*tPathLength/lambda0 && kineticEnergy > 20*MeV) { 
    //G4cout << "Warning: large scattering E(MeV)= " << kineticEnergy 
    //     << " s(mm)= " << tPathLength/mm
    //     << " 1-cosTheta= " << 1.0 - cth << G4endl;
    // do Gaussian central scattering
  //  if(kineticEnergy > 0.5*GeV && cth < 0.9) {
  /*
  if(cth < 1.0 - 1000*tPathLength/lambda0 && 
     cth < 0.9 && kineticEnergy > 500*MeV) { 
    G4ExceptionDescription ed;
    ed << particle->GetParticleName()
       << " E(MeV)= " << kineticEnergy/MeV
       << " Step(mm)= " << tPathLength/mm
       << " tau= " << tPathLength/lambda0
       << " in " << CurrentCouple()->GetMaterial()->GetName()
       << " CosTheta= " << cth 
       << " is too big";
    G4Exception("UrbanMscModel93::SampleScattering","em0004",
        JustWarning, ed,"");
  }
  */

  G4double sth  = sqrt((1.0 - cth)*(1.0 + cth));
  G4double phi  = twopi*G4UniformRand();
  G4double dirx = sth*cos(phi);
  G4double diry = sth*sin(phi);

  G4ThreeVector newDirection(dirx,diry,cth);
  newDirection.rotateUz(oldDirection);
  fParticleChange->ProposeMomentumDirection(newDirection);

  if (latDisplasment && safety > tlimitminfix) {

    G4double r = SampleDisplacement();
    /*    
    G4cout << "UrbanMscModel93::SampleSecondaries: e(MeV)= " << kineticEnergy
       << " sinTheta= " << sth << " r(mm)= " << r
           << " trueStep(mm)= " << tPathLength
           << " geomStep(mm)= " << zPathLength
           << G4endl;
    */
    if(r > 0.)
      {
        G4double latcorr = LatCorrelation();
        if(latcorr > r) latcorr = r;

        // sample direction of lateral displacement
        // compute it from the lateral correlation
        G4double Phi = 0.;
        if(std::abs(r*sth) < latcorr)
          Phi  = twopi*G4UniformRand();
        else
        {
          G4double psi = std::acos(latcorr/(r*sth));
          if(G4UniformRand() < 0.5)
            Phi = phi+psi;
          else
            Phi = phi-psi;
        }

        dirx = r*std::cos(Phi);
        diry = r*std::sin(Phi);

    fDisplacement.set(dirx,diry,0.0);
    fDisplacement.rotateUz(oldDirection);
      }
  }
  return fDisplacement;
}

void UrbanMscModel93::SetParticle ( const G4ParticleDefinition *  p )

inlineprivate

Definition at line 182 of file UrbanMscModel93.h.

References charge, ChargeSquare, mass, AlCaHLTBitMon_ParallelJobs::p, and particle.

Referenced by ComputeCrossSectionPerAtom(), Initialise(), and StartTracking().

{
  if (p != particle) {
    particle = p;
    mass = p->GetPDGMass();
    charge = p->GetPDGCharge()/CLHEP::eplus;
    ChargeSquare = charge*charge;
  }
}

G4double UrbanMscModel93::SimpleScattering ( G4double  xmeanth, G4double  x2meanth  )

inlineprivate

Definition at line 238 of file UrbanMscModel93.h.

References a.

Referenced by SampleCosineTheta().

{
  // 'large angle scattering'
  // 2 model functions with correct xmean and x2mean
  G4double a = (2.*xmeanth+9.*x2meanth-3.)/(2.*xmeanth-3.*x2meanth+1.);
  G4double prob = (a+2.)*xmeanth/a;

  // sampling
  G4double cth = 1.;
  if(G4UniformRand() < prob) {
    cth = -1.+2.*G4Exp(G4Log(G4UniformRand())/(a+1.));
  } else {
    cth = -1.+2.*G4UniformRand();
  }
  return cth;
}

void UrbanMscModel93::StartTracking

(

G4Track *

track

)

Definition at line 415 of file UrbanMscModel93.cc.

References firstStep, geombig, inside, insideskin, SetParticle(), stepmin, tlimit, tlimitmin, and tlimitminfix.

{
  SetParticle(track->GetDynamicParticle()->GetDefinition());
  firstStep = true; 
  inside = false;
  insideskin = false;
  tlimit = geombig;
  stepmin = tlimitminfix ;
  tlimitmin = 10.*stepmin ;
}

void UrbanMscModel93::UpdateCache ( )

inlineprivate

Definition at line 195 of file UrbanMscModel93.h.

References ChargeSquare, coeffc1, coeffc2, coeffth1, coeffth2, lnZ, scr1, scr1ini, scr2, scr2ini, Z2, Z23, Zeff, and Zold.

Referenced by SampleCosineTheta().

{
  lnZ = G4Log(Zeff);
  //new correction in theta0 formula
  coeffth1 = (1.-8.7780e-2/Zeff)*(0.87+0.03*lnZ);                   
  coeffth2 = (4.0780e-2+1.7315e-4*Zeff)*(0.87+0.03*lnZ);              
  // tail parameters
  G4double lnZ1 = G4Log(Zeff+1.);
  coeffc1  = 2.943-0.197*lnZ1;                  
  coeffc2  = 0.0987-0.0143*lnZ1;                              
  // for single scattering
  Z2   = Zeff*Zeff;
  Z23  = G4Exp(2.*lnZ/3.);
  scr1 = scr1ini*Z23;
  scr2 = scr2ini*Z2*ChargeSquare;
                                              
  Zold = Zeff;
}

Member Data Documentation

G4double UrbanMscModel93::charge

private

Definition at line 126 of file UrbanMscModel93.h.

Referenced by ComputeCrossSectionPerAtom(), ComputeTheta0(), SetParticle(), and UrbanMscModel93().

G4double UrbanMscModel93::ChargeSquare

private

Definition at line 126 of file UrbanMscModel93.h.

Referenced by ComputeCrossSectionPerAtom(), SetParticle(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::coeffc1

private

Definition at line 170 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::coeffc2

private

Definition at line 170 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::coeffth1

private

Definition at line 169 of file UrbanMscModel93.h.

Referenced by ComputeTheta0(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::coeffth2

private

Definition at line 169 of file UrbanMscModel93.h.

Referenced by ComputeTheta0(), UpdateCache(), and UrbanMscModel93().

const G4MaterialCutsCouple* UrbanMscModel93::couple

private

Definition at line 122 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), SampleCosineTheta(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::currentKinEnergy

private

Definition at line 154 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTheta0(), ComputeTruePathLengthLimit(), SampleCosineTheta(), SampleScattering(), and UrbanMscModel93().

G4int UrbanMscModel93::currentMaterialIndex

private

Definition at line 164 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::currentRadLength

private

Definition at line 157 of file UrbanMscModel93.h.

Referenced by ComputeTheta0(), SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::currentRange

private

Definition at line 155 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), ComputeTrueStepLength(), SampleCosineTheta(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::currentTau

private

Definition at line 132 of file UrbanMscModel93.h.

Referenced by LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), and UrbanMscModel93().

G4double UrbanMscModel93::ea

private

Definition at line 159 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::eaa

private

Definition at line 159 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4bool UrbanMscModel93::firstStep

private

Definition at line 173 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), StartTracking(), and UrbanMscModel93().

G4ParticleChangeForMSC* UrbanMscModel93::fParticleChange

private

Definition at line 120 of file UrbanMscModel93.h.

Referenced by Initialise(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::fr

private

Definition at line 127 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::geombig

private

Definition at line 138 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::geomlimit

private

Definition at line 140 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::geommin

private

Definition at line 139 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4bool UrbanMscModel93::inside

private

Definition at line 174 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), StartTracking(), and UrbanMscModel93().

G4bool UrbanMscModel93::insideskin

private

Definition at line 175 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), ComputeTrueStepLength(), LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::lambda0

private

Definition at line 146 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), ComputeTrueStepLength(), SampleCosineTheta(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::lambdaeff

private

Definition at line 147 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), and UrbanMscModel93().

G4double UrbanMscModel93::lambdalimit

private

Definition at line 127 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::lnZ

private

Definition at line 168 of file UrbanMscModel93.h.

Referenced by UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::mass

private

Definition at line 125 of file UrbanMscModel93.h.

Referenced by Particle.Particle::__str__(), ZMuMuRochCorAnalyzer.DiMuon::__str__(), DiObject.DiMuon::__str__(), ComputeCrossSectionPerAtom(), ComputeGeomPathLength(), ComputeTheta0(), ComputeTruePathLengthLimit(), SampleCosineTheta(), SetParticle(), and UrbanMscModel93().

G4double UrbanMscModel93::masslimite

private

Definition at line 127 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::numlim

private

Definition at line 159 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::par1

private

Definition at line 150 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTrueStepLength(), SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::par2

private

Definition at line 150 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::par3

private

Definition at line 150 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTrueStepLength(), and UrbanMscModel93().

const G4ParticleDefinition* UrbanMscModel93::particle

private

Definition at line 119 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), SampleScattering(), SetParticle(), and UrbanMscModel93().

G4double UrbanMscModel93::presafety

private

Definition at line 144 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::rangeinit

private

Definition at line 156 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::rellossmax

private

Definition at line 161 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::scr1

private

Definition at line 171 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::scr1ini

private

Definition at line 171 of file UrbanMscModel93.h.

Referenced by UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::scr2

private

Definition at line 171 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::scr2ini

private

Definition at line 171 of file UrbanMscModel93.h.

Referenced by UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::skindepth

private

Definition at line 141 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), Initialise(), and UrbanMscModel93().

G4double UrbanMscModel93::smallstep

private

Definition at line 142 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4double UrbanMscModel93::stepmin

private

Definition at line 152 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), Initialise(), SampleCosineTheta(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::taubig

private

Definition at line 129 of file UrbanMscModel93.h.

Referenced by LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), and UrbanMscModel93().

G4double UrbanMscModel93::taulim

private

Definition at line 131 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), and UrbanMscModel93().

G4double UrbanMscModel93::tausmall

private

Definition at line 130 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTrueStepLength(), LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::tgeom

private

Definition at line 136 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), and UrbanMscModel93().

G4LossTableManager* UrbanMscModel93::theManager

private

Definition at line 123 of file UrbanMscModel93.h.

Referenced by UrbanMscModel93().

G4double UrbanMscModel93::theta0max

private

Definition at line 161 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::third

private

Definition at line 162 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), LatCorrelation(), SampleCosineTheta(), SampleDisplacement(), and UrbanMscModel93().

G4double UrbanMscModel93::tlimit

private

Definition at line 133 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::tlimitmin

private

Definition at line 134 of file UrbanMscModel93.h.

Referenced by ComputeTruePathLengthLimit(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::tlimitminfix

private

Definition at line 135 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), ComputeTrueStepLength(), SampleScattering(), StartTracking(), and UrbanMscModel93().

G4double UrbanMscModel93::tPathLength

private

Definition at line 148 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTruePathLengthLimit(), ComputeTrueStepLength(), SampleDisplacement(), SampleScattering(), and UrbanMscModel93().

G4double UrbanMscModel93::xsi

private

Definition at line 159 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::y

private

Definition at line 166 of file UrbanMscModel93.h.

Referenced by svgfig.Ellipse::__repr__(), Vispa.Gui.WidgetContainer.WidgetContainer::autosize(), Vispa.Gui.VispaWidget.VispaWidget::boundingRect(), ComputeTheta0(), geometryXMLparser.Alignable::pos(), Vispa.Gui.ConnectableWidget.ConnectableWidget::positionizeMenuWidget(), SampleCosineTheta(), and UrbanMscModel93().

G4double UrbanMscModel93::Z2

private

Definition at line 168 of file UrbanMscModel93.h.

Referenced by UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::Z23

private

Definition at line 168 of file UrbanMscModel93.h.

Referenced by ComputeCrossSectionPerAtom(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::Zeff

private

Definition at line 168 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::Zold

private

Definition at line 167 of file UrbanMscModel93.h.

Referenced by SampleCosineTheta(), UpdateCache(), and UrbanMscModel93().

G4double UrbanMscModel93::zPathLength

private

Definition at line 149 of file UrbanMscModel93.h.

Referenced by ComputeGeomPathLength(), ComputeTrueStepLength(), SampleDisplacement(), and UrbanMscModel93().