G4hICRU49He Class Reference

#include <G4hICRU49He.hh>

Inheritance diagram for G4hICRU49He:

Public Member Functions
G4double	ElectronicStoppingPower (G4double z, G4double kineticEnergy) const override
	G4hICRU49He ()
G4bool	HasMaterial (const G4Material *material) override
G4double	StoppingPower (const G4Material *material, G4double kineticEnergy) override
	~G4hICRU49He ()

Protected Member Functions
G4double	GetHeMassAMU () const
G4double	HeEffChargeSquare (const G4double z, const G4double kineticEnergyHe) const

Private Member Functions
void	SetMoleculaNumber (G4int number)

Private Attributes
G4int	iMolecula
G4double	rateMass
const G4double	theHeMassAMU

Detailed Description

Definition at line 58 of file G4hICRU49He.hh.

Constructor & Destructor Documentation

G4hICRU49He()

G4hICRU49He::G4hICRU49He ( )

explicit

Definition at line 67 of file G4hICRU49He.cc.

                        :G4VhElectronicStoppingPower(),
  rateMass(4.0026/1.007276),
  iMolecula(0)
{;}

~G4hICRU49He()

G4hICRU49He::~G4hICRU49He

(

)

Definition at line 74 of file G4hICRU49He.cc.

{;}

Member Function Documentation

ElectronicStoppingPower()

G4double G4hICRU49He::ElectronicStoppingPower ( G4double  z, G4double  kineticEnergy  ) const

overridevirtual

Implements G4VhElectronicStoppingPower.

Definition at line 204 of file G4hICRU49He.cc.

{
  G4double ionloss ;
  G4int i = G4int(z)-1 ;  // index of atom
  if(i < 0)  i = 0 ;
  if(i > 91) i = 91 ;
 
  // The data and the fit from:
  // ICRU Report 49, 1993. Ziegler's type of parametrisations
  // Reduced kinetic energy
 
  // He energy in internal units of parametrisation formula (MeV)
  G4double T = kineticEnergy*rateMass/MeV ;
 
  static const G4double a[92][5] = {
    {0.35485, 0.6456, 6.01525,  20.8933, 4.3515
   },{ 0.58,    0.59,   6.3,     130.0,   44.07
   },{ 1.42,    0.49,   12.25,    32.0,    9.161
   },{ 2.1895,  0.47183,7.2362,   134.30,  197.96
   },{ 3.691,   0.4128, 18.48,    50.72,   9.0
   },{ 3.83523, 0.42993,12.6125,  227.41,  188.97
   },{ 1.9259,  0.5550, 27.15125, 26.0665, 6.2768
   },{ 2.81015, 0.4759, 50.0253,  10.556,  1.0382
   },{ 1.533,   0.531,  40.44,    18.41,   2.718
   },{ 2.303,   0.4861, 37.01,    37.96,   5.092
   },{ 9.894,   0.3081, 23.65,    0.384,   92.93
   },{ 4.3,     0.47,   34.3,     3.3,     12.74
   },{ 2.5,     0.625,  45.7,     0.1,     4.359
   },{ 2.1,     0.65,   49.34,    1.788,   4.133
   },{ 1.729,   0.6562, 53.41,    2.405,   3.845
   },{ 1.402,   0.6791, 58.98,    3.528,   3.211
   },{ 1.117,   0.7044, 69.69,    3.705,    2.156
   },{ 2.291,   0.6284, 73.88,    4.478,    2.066
   },{ 8.554,   0.3817, 83.61,    11.84,    1.875
   },{ 6.297,   0.4622, 65.39,    10.14,    5.036
   },{ 5.307,   0.4918, 61.74,    12.4,    6.665
   },{ 4.71,    0.5087, 65.28,    8.806,    5.948
   },{ 6.151,   0.4524, 83.0,    18.31,    2.71
   },{ 6.57,    0.4322, 84.76,    15.53,    2.779
   },{ 5.738,   0.4492, 84.6,    14.18,    3.101
   },{ 5.013,   0.4707, 85.8,    16.55,    3.211
   },{ 4.32,    0.4947, 76.14,    10.85,    5.441
   },{ 4.652,   0.4571, 80.73,    22.0,    4.952
   },{ 3.114,   0.5236, 76.67,    7.62,    6.385
   },{ 3.114,   0.5236, 76.67,    7.62,    7.502
   },{ 3.114,   0.5236, 76.67,    7.62,    8.514
   },{ 5.746,   0.4662, 79.24,    1.185,    7.993
   },{ 2.792,   0.6346, 106.1,    0.2986,   2.331
   },{ 4.667,   0.5095, 124.3,    2.102,    1.667
   },{ 2.44,    0.6346, 105.0,    0.83,    2.851
   },{ 1.413,   0.7377, 147.9,    1.466,    1.016
   },{ 11.72,   0.3826, 102.8,    9.231,    4.371
   },{ 7.126,   0.4804, 119.3,    5.784,    2.454
   },{ 11.61,   0.3955, 146.7,    7.031,    1.423
   },{ 10.99,   0.41,   163.9,   7.1,      1.052
   },{ 9.241,   0.4275, 163.1,    7.954,    1.102
   },{ 9.276,   0.418,  157.1,   8.038,    1.29
   },{ 3.999,   0.6152, 97.6,    1.297,    5.792
   },{ 4.306,   0.5658, 97.99,    5.514,    5.754
   },{ 3.615,   0.6197, 86.26,    0.333,    8.689
   },{ 5.8,     0.49,   147.2,   6.903,    1.289
   },{ 5.6,     0.49,   130.0,   10.0,     2.844
   },{ 3.55,    0.6068, 124.7,    1.112,    3.119
   },{ 3.6,     0.62,   105.8,   0.1692,   6.026
   },{ 5.4,     0.53,   103.1,   3.931,    7.767
   },{ 3.97,    0.6459, 131.8,    0.2233,   2.723
   },{ 3.65,    0.64,   126.8,   0.6834,   3.411
   },{ 3.118,   0.6519, 164.9,    1.208,    1.51
   },{ 3.949,   0.6209, 200.5,    1.878,    0.9126
   },{ 14.4,    0.3923, 152.5,    8.354,    2.597
   },{ 10.99,   0.4599, 138.4,    4.811,    3.726
   },{ 16.6,    0.3773, 224.1,    6.28,    0.9121
   },{ 10.54,   0.4533, 159.3,   4.832,    2.529
   },{ 10.33,   0.4502, 162.0,   5.132,    2.444
   },{ 10.15,   0.4471, 165.6,   5.378,    2.328
   },{ 9.976,   0.4439, 168.0,   5.721,    2.258
   },{ 9.804,   0.4408, 176.2,   5.675,    1.997
   },{ 14.22,   0.363,  228.4,   7.024,    1.016
   },{ 9.952,   0.4318, 233.5,   5.065,    0.9244
   },{ 9.272,   0.4345, 210.0,   4.911,    1.258
   },{ 10.13,   0.4146, 225.7,   5.525,    1.055
   },{ 8.949,   0.4304, 213.3,   5.071,    1.221
   },{ 11.94,   0.3783, 247.2,   6.655,    0.849
   },{ 8.472,   0.4405, 195.5,   4.051,    1.604
   },{ 8.301,   0.4399, 203.7,   3.667,    1.459
   },{ 6.567,   0.4858, 193.0,   2.65,     1.66
   },{ 5.951,   0.5016, 196.1,   2.662,    1.589
   },{ 7.495,   0.4523, 251.4,   3.433,    0.8619
   },{ 6.335,   0.4825, 255.1,   2.834,    0.8228
   },{ 4.314,   0.5558, 214.8,   2.354,    1.263
   },{ 4.02,    0.5681, 219.9,   2.402,    1.191
   },{ 3.836,   0.5765, 210.2,   2.742,    1.305
   },{ 4.68,    0.5247, 244.7,   2.749,    0.8962
   },{ 3.223,   0.5883, 232.7,   2.954,    1.05
   },{ 2.892,   0.6204, 208.6,   2.415,    1.416
   },{ 4.728,   0.5522, 217.0,   3.091,    1.386
   },{ 6.18,    0.52,   170.0,   4.0,      3.224
   },{ 9.0,     0.47,   198.0,   3.8,      2.032
   },{ 2.324,   0.6997, 216.0,   1.599,    1.399
   },{ 1.961,   0.7286, 223.0,   1.621,    1.296
   },{ 1.75,    0.7427, 350.1,   0.9789,   0.5507
   },{ 10.31,   0.4613, 261.2,   4.738,    0.9899
   },{ 7.962,   0.519,  235.7,   4.347,    1.313
   },{ 6.227,   0.5645, 231.9,   3.961,    1.379
   },{ 5.246,   0.5947, 228.6,   4.027,    1.432
   },{ 5.408,   0.5811, 235.7,   3.961,    1.358
   },{ 5.218,   0.5828, 245.0,   3.838,    1.25}
  };
 
  // Free electron gas model
  if ( T < 0.001 ) {
    G4double slow  = a[i][0] ;
    G4double shigh = std::log( 1.0 + a[i][3]*1000.0 + a[i][4]*0.001 )
                   * a[i][2]*1000.0 ;
    ionloss  = slow*shigh / (slow + shigh) ;
    ionloss *= std::sqrt(T*1000.0) ;
 
  // Main parametrisation
  } else {
    G4double slow  = a[i][0] * std::pow((T*1000.0), a[i][1]) ;
    G4double shigh = std::log( 1.0 + a[i][3]/T + a[i][4]*T ) * a[i][2]/T ;
    ionloss = slow*shigh / (slow + shigh) ;
 
  }
  if ( ionloss < 0.0) ionloss = 0.0 ;
 
  // He effective charge
  ionloss /= HeEffChargeSquare(z, kineticEnergy*rateMass) ;
 
  return ionloss;
}

References G4VhElectronicStoppingPower::HeEffChargeSquare(), MeV, and rateMass.

Referenced by StoppingPower().

GetHeMassAMU()

G4double G4VhElectronicStoppingPower::GetHeMassAMU ( ) const

inlineprotectedinherited

Definition at line 86 of file G4VhElectronicStoppingPower.hh.

{return theHeMassAMU;};

References G4VhElectronicStoppingPower::theHeMassAMU.

Referenced by G4VhElectronicStoppingPower::HeEffChargeSquare().

HasMaterial()

G4bool G4hICRU49He::HasMaterial ( const G4Material *  material )

overridevirtual

Implements G4VhElectronicStoppingPower.

Definition at line 79 of file G4hICRU49He.cc.

{
  G4String chFormula = material->GetChemicalFormula() ;
  G4String myFormula = G4String(" ");
 
  if (myFormula == chFormula ) {
    if(1 == (material->GetNumberOfElements())) {return true;}
    return false ;
  }
 
  // ICRU Report N49, 1993. Power's model for He.
  const size_t numberOfMolecula = 30 ;
  static const G4String name[numberOfMolecula] = {
    "H_2", "Be-Solid", "C-Solid", "Graphite", "N_2",
    "O_2", "Al-Solid", "Si-Solid", "Ar-Solid", "Cu-Solid",
    "Ge", "W-Solid", "Au-Solid", "Pb-Solid", "C_2H_2",
    "CO_2", "Cellulose-Nitrat", "C_2H_4", "LiF",
    "CH_4", "Nylon", "Polycarbonate", "(CH_2)_N-Polyetilene", "PMMA",
    "(C_8H_8)_N", "SiO_2", "CsI", "H_2O", "H_2O-Gas"};
 
  // Special treatment for water in gas state
 
  myFormula = G4String("H_2O") ;
  const G4State theState = material->GetState() ;
  if( theState == kStateGas && myFormula == chFormula) {
    chFormula = G4String("H_2O-Gas");
  }
 
  // Search for the material in the table
  for (size_t i=0; i<numberOfMolecula; i++) {
      if (chFormula == name[i]) {
        SetMoleculaNumber(i) ;
    return true ;
      }
  }
  return false ;
}

References kStateGas, eplot::material, G4InuclParticleNames::name(), numberOfMolecula, and SetMoleculaNumber().

HeEffChargeSquare()

G4double G4VhElectronicStoppingPower::HeEffChargeSquare ( const G4double  z, const G4double  kineticEnergyHe  ) const

protectedinherited

This method returns He effective charge square parametrised according to J.F.Ziegler, J.P. Biersack, U. Littmark The Stopping and Range of Ions in Matter, Vol.1, Pergamon Press, 1985

Definition at line 69 of file G4VhElectronicStoppingPower.cc.

{
  // The aproximation of He effective charge from:
  // J.F.Ziegler, J.P. Biersack, U. Littmark
  // The Stopping and Range of Ions in Matter,
  // Vol.1, Pergamon Press, 1985
 
  static const G4double c[6] = {0.2865,  0.1266, -0.001429,
                0.02402,-0.01135, 0.001475} ;
 
  G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
  G4double x = c[0] ;
  G4double y = 1.0 ;
  for (G4int i=1; i<6; i++) {
    y *= e ;
    x += y * c[i] ;
  }
 
  G4double w = 7.6 -  e ;
  w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w ) ;
  w = 4.0 * (1.0 - G4Exp(-x)) * w * w ;
  return w;
}

References G4Exp(), G4VhElectronicStoppingPower::GetHeMassAMU(), keV, and G4INCL::Math::max().

Referenced by ElectronicStoppingPower(), and StoppingPower().

SetMoleculaNumber()

void G4hICRU49He::SetMoleculaNumber ( G4int  number )

inlineprivate

Definition at line 75 of file G4hICRU49He.hh.

{iMolecula = number;};

References iMolecula.

Referenced by HasMaterial().

StoppingPower()

G4double G4hICRU49He::StoppingPower ( const G4Material *  material, G4double  kineticEnergy  )

overridevirtual

Implements G4VhElectronicStoppingPower.

Definition at line 119 of file G4hICRU49He.cc.

{
  G4double ionloss = 0.0 ;
 
  // pure material (normally not the case for this function)
  if(1 == (material->GetNumberOfElements())) {
    G4double z = material->GetZ() ;
    ionloss = ElectronicStoppingPower( z, kineticEnergy ) ;
 
  // The data and the fit from:
  // ICRU Report N49, 1993. Power's model for He.
  } else if ( iMolecula < 30 ) {
 
    // Reduced kinetic energy
    // in internal units of parametrisation formula (MeV)
    G4double T = kineticEnergy*rateMass/MeV ;
 
    static const G4double c[30][7] = {
      {8.0080,  3.6287,  23.0700,  14.9900,  0.8507, 0.60, 2.0
   },{ 13.3100,  3.7432,  39.4130,  12.1990,  1.0950, 0.38, 1.4
   },{ 22.7240,  3.6040,  47.1810,  17.5490,  0.9040, 0.40, 1.4
   },{ 24.4040,  2.4032,  48.9440,  27.9730,  1.2933, 0.40, 1.6
   },{ 58.4719,  1.5115,  77.6421,  102.490,  1.5811, 0.50, 2.0
   },{ 60.5408,  1.6297,  91.7601,  94.1260,  1.3662, 0.50, 2.0
   },{ 48.4480,  6.4323,  59.2890,  18.3810,  0.4937, 0.48, 1.6
   },{ 59.0346,  5.1305,  47.0866,  30.0857,  0.3500, 0.60, 2.0
   },{ 71.8691,  2.8250,  51.1658,  57.1235,  0.4477, 0.60, 2.0
   },{ 78.3520,  4.0961,  136.731,  28.4470,  1.0621, 0.52, 1.2
   },{ 120.553,  1.5374,  49.8740,  82.2980,  0.8733, 0.45, 1.6
   },{ 249.896,  0.6996,  -37.274,  248.592,  1.1052, 0.50, 1.5
   },{ 246.698,  0.6219,  -58.391,  292.921,  0.8186, 0.56, 1.8
   },{ 248.563,  0.6235,  -36.8968, 306.960,  1.3214, 0.50, 2.0
   },{ 25.5860,  1.7125,  154.723,  118.620,  2.2580, 0.50, 2.0
   },{ 138.294,  25.6413, 231.873,  17.3780,  0.3218, 0.58, 1.3
   },{ 83.2091,  1.1294,  135.7457, 190.865,  2.3461, 0.50, 2.0
   },{ 263.542,  1.4754,  1541.446, 781.898,  1.9209, 0.40, 2.0
   },{ 59.5545,  1.5354,  132.1523, 153.3537, 2.0262, 0.50, 2.0
   },{ 31.7380,  19.820,  125.2100, 6.8910,   0.7242, 0.50, 1.1
   },{ 31.7549,  1.5682,  97.4777,  106.0774, 2.3204, 0.50, 2.0
   },{ 230.465,  4.8967,  1845.320, 358.641,  1.0774, 0.46, 1.2
   },{ 423.444,  5.3761,  1189.114, 319.030,  0.7652, 0.48, 1.5
   },{ 86.3410,  3.3322,  91.0433,  73.1091,  0.4650, 0.50, 2.0
   },{ 146.105,  9.4344,  515.1500, 82.8860,  0.6239, 0.55, 1.5
   },{ 238.050,  5.6901,  372.3575, 146.1835, 0.3992, 0.50, 2.0
   },{ 124.2338, 2.6730,  133.8175, 99.4109,  0.7776, 0.50, 2.0
   },{ 221.723,  1.5415,  87.7315,  192.5266, 1.0742, 0.50, 2.0
   },{ 26.7537,  1.3717,  90.8007,  77.1587,  2.3264, 0.50, 2.0
   },{ 37.6121,  1.8052,  73.0250,  66.2070,  1.4038, 0.50, 2.0} };
 
    G4double a1,a2 ;
 
  // Free electron gas model
    if ( T < 0.001 ) {
      G4double T0 = 0.001 ;
      a1 = 1.0 - G4Exp(-c[iMolecula][1]*std::pow(T0,-2.0+c[iMolecula][5])) ;
      a2 = (c[iMolecula][0]*std::log(T0)/T0 + c[iMolecula][2]/T0) *
            G4Exp(-c[iMolecula][4]*std::pow(T0,-c[iMolecula][6])) +
            c[iMolecula][3]/(T0*T0) ;
 
      ionloss = a1*a2*std::sqrt(T/T0) ;
 
  // Main parametrisation
    } else {
      a1 = 1.0 - G4Exp(-c[iMolecula][1]*std::pow(T,-2.0+c[iMolecula][5])) ;
      a2 = (c[iMolecula][0]*std::log(T)/T + c[iMolecula][2]/T) *
            G4Exp(-c[iMolecula][4]*std::pow(T,-c[iMolecula][6])) +
            c[iMolecula][3]/(T*T) ;
      ionloss = a1*a2;
    }
 
  // He effective charge
    G4double z = (material->GetTotNbOfElectPerVolume()) /
                 (material->GetTotNbOfAtomsPerVolume()) ;
 
    ionloss /= HeEffChargeSquare(z, kineticEnergy*rateMass) ;
 
    if ( ionloss < 0.0) ionloss = 0.0 ;
  }
 
  return ionloss ;
}

References ElectronicStoppingPower(), G4Exp(), G4VhElectronicStoppingPower::HeEffChargeSquare(), iMolecula, eplot::material, MeV, rateMass, and T0.

Field Documentation

iMolecula

G4int G4hICRU49He::iMolecula

private

Definition at line 78 of file G4hICRU49He.hh.

Referenced by SetMoleculaNumber(), and StoppingPower().

rateMass

G4double G4hICRU49He::rateMass

private

Definition at line 77 of file G4hICRU49He.hh.

Referenced by ElectronicStoppingPower(), and StoppingPower().

theHeMassAMU

const G4double G4VhElectronicStoppingPower::theHeMassAMU

privateinherited

Definition at line 90 of file G4VhElectronicStoppingPower.hh.

Referenced by G4VhElectronicStoppingPower::GetHeMassAMU().

---

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

• source/processes/electromagnetic/lowenergy/include/G4hICRU49He.hh
• source/processes/electromagnetic/lowenergy/src/G4hICRU49He.cc