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1 // 1 //
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15 // * use. Please see the license in the file << 14 // * use. *
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18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
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21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
>> 23 //
>> 24 // $Id: G4Electron.cc,v 1.7 2001/10/16 08:16:17 kurasige Exp $
>> 25 // GEANT4 tag $Name: geant4-05-00 $
>> 26 //
>> 27 //
26 // ------------------------------------------- 28 // ----------------------------------------------------------------------
27 // GEANT 4 class implementation file 29 // GEANT 4 class implementation file
28 // 30 //
29 // History: first implementation, based o 31 // History: first implementation, based on object model of
30 // 4th April 1996, G.Cosmo 32 // 4th April 1996, G.Cosmo
31 // ******************************************* 33 // **********************************************************************
32 // New impelemenataion as an utility class M << 34 // Added particle definitions, H.Kurashige, 19 April 1996
>> 35 // Added SetCuts implementation, L.Urban, 30 May 1996
>> 36 // Revised, G.Cosmo, 6 June 1996
>> 37 // Code uses operators (+=, *=, ++, -> etc.) correctly, P. Urban, 26/6/96
>> 38 // Add ElectronDefinition() H.Kurashige 4 July 1996
33 // ------------------------------------------- 39 // ----------------------------------------------------------------------
34 40
>> 41 #include "g4std/fstream"
>> 42 #include "g4std/iomanip"
>> 43
35 #include "G4Electron.hh" 44 #include "G4Electron.hh"
>> 45 // ######################################################################
>> 46 // ### ELECTRON ###
>> 47 // ######################################################################
>> 48
>> 49 G4Electron::G4Electron(
>> 50 const G4String& aName, G4double mass,
>> 51 G4double width, G4double charge,
>> 52 G4int iSpin, G4int iParity,
>> 53 G4int iConjugation, G4int iIsospin,
>> 54 G4int iIsospin3, G4int gParity,
>> 55 const G4String& pType, G4int lepton,
>> 56 G4int baryon, G4int encoding,
>> 57 G4bool stable, G4double lifetime,
>> 58 G4DecayTable *decaytable )
>> 59 : G4VLepton( aName,mass,width,charge,iSpin,iParity,
>> 60 iConjugation,iIsospin,iIsospin3,gParity,pType,
>> 61 lepton,baryon,encoding,stable,lifetime,decaytable )
>> 62 {
>> 63 SetParticleSubType("e");
>> 64 }
36 65
37 #include "G4ParticleTable.hh" << 66 // ......................................................................
38 #include "G4PhysicalConstants.hh" << 67 // ... static member definitions ...
39 #include "G4String.hh" << 68 // ......................................................................
40 #include "G4SystemOfUnits.hh" << 69 //
41 #include "G4Types.hh" << 70 // Arguments for constructor are as follows
>> 71 // name mass width charge
>> 72 // 2*spin parity C-conjugation
>> 73 // 2*Isospin 2*Isospin3 G-parity
>> 74 // type lepton number baryon number PDG encoding
>> 75 // stable lifetime decay table
>> 76
>> 77 G4Electron G4Electron::theElectron(
>> 78 "e-", 0.51099906*MeV, 0.0*MeV, -1.*eplus,
>> 79 1, 0, 0,
>> 80 0, 0, 0,
>> 81 "lepton", 1, 0, 11,
>> 82 true, -1.0, NULL
>> 83 );
42 84
43 G4Electron* G4Electron::theInstance = nullptr; << 85 G4Electron* G4Electron::ElectronDefinition(){return &theElectron;}
44 86
45 G4Electron* G4Electron::Definition() << 87 // **********************************************************************
>> 88 // ************************* ComputeLoss ********************************
>> 89 // **********************************************************************
>> 90 G4double G4Electron::ComputeLoss(G4double AtomicNumber,
>> 91 G4double KineticEnergy) const
46 { 92 {
47 if (theInstance != nullptr) return theInstan << 93 static G4double Z;
48 const G4String name = "e-"; << 94 static G4double taul, ionpot, ionpotlog;
49 // search in particle table] << 95 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
50 G4ParticleTable* pTable = G4ParticleTable::G << 96 const G4double Tlow=10.*keV, Thigh=1.*GeV;
51 G4ParticleDefinition* anInstance = pTable->F << 97
52 if (anInstance == nullptr) { << 98 static G4double bremfactor= 0.1 ;
53 // create particle << 99
54 // << 100 // calculate dE/dx for electrons
55 // Arguments for constructor are as fol << 101 if( abs(AtomicNumber-Z)>0.1 )
56 // name mass << 102 {
57 // 2*spin parity C- << 103 Z = AtomicNumber;
58 // 2*Isospin 2*Isospin3 << 104 taul = Tlow/GetPDGMass();
59 // type lepton number ba << 105 ionpot = 1.6e-5*MeV*exp(0.9*log(Z))/GetPDGMass();
60 // stable lifetime << 106 ionpotlog = log(ionpot);
61 // shortlived subType << 107 }
62 << 108
63 // use constants in CLHEP << 109
64 // static const double electron_mass_c2 = << 110 G4double tau = KineticEnergy/GetPDGMass();
65 << 111 G4double dEdx;
66 // clang-format off << 112
67 anInstance = new G4ParticleDefinition( << 113 if(tau<taul) {
68 name, electron_mass_c2, << 114 G4double t1 = taul+1.;
69 1, 0, 0, << 115 G4double t2 = taul+2.;
70 0, 0, 0, << 116 G4double tsq = taul*taul;
71 "lepton", 1, << 117 G4double beta2 = taul*t2/(t1*t1);
72 true, -1.0, nullptr << 118 G4double f = 1.-beta2+log(tsq/2.)
73 false, "e" << 119 +(0.5+0.25*tsq+(1.+2.*taul)*log(0.5))/(t1*t1);
74 ); << 120 dEdx = (log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
75 // clang-format on << 121 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 122 G4double clow = dEdx*sqrt(taul);
>> 123 dEdx = clow/sqrt(KineticEnergy/GetPDGMass());
>> 124 } else {
>> 125 G4double t1 = tau+1.;
>> 126 G4double t2 = tau+2.;
>> 127 G4double tsq = tau*tau;
>> 128 G4double beta2 = tau*t2/(t1*t1);
>> 129 G4double f = 1.-beta2+log(tsq/2.)
>> 130 +(0.5+0.25*tsq+(1.+2.*tau)*log(0.5))/(t1*t1);
>> 131 dEdx = (log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 132 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 133
>> 134 // loss from bremsstrahlung follows
>> 135 G4double cbrem = (cbr1+cbr2*Z)
>> 136 *(cbr3+cbr4*log(KineticEnergy/Thigh));
>> 137 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
76 138
77 // Bohr Magnetron << 139 cbrem *= bremfactor ;
78 G4double muB = -0.5 * eplus * hbar_Planck <<
79 140
80 anInstance->SetPDGMagneticMoment(muB * 1.0 << 141 dEdx += twopi_mc2_rcl2*cbrem;
81 } 142 }
82 theInstance = static_cast<G4Electron*>(anIns << 143
83 return theInstance; << 144 return dEdx;
84 } 145 }
85 146
86 G4Electron* G4Electron::ElectronDefinition() << 147 // **********************************************************************
>> 148 // *********************** BuildRangeVector *****************************
>> 149 // **********************************************************************
>> 150
>> 151 void G4Electron::BuildRangeVector(const G4Material* aMaterial,
>> 152 const G4LossTable* aLossTable,
>> 153 G4double maxEnergy,
>> 154 G4double aMass,
>> 155 G4PhysicsLogVector* rangeVector)
87 { 156 {
88 return Definition(); << 157 // create range vector for a material
89 } << 158 const G4double tlim = 10.*keV;
>> 159 const G4int maxnbint = 100;
>> 160
>> 161 const G4ElementVector* elementVector = aMaterial->GetElementVector();
>> 162 const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
>> 163 G4int NumEl = aMaterial->GetNumberOfElements();
>> 164
>> 165 // calculate parameters of the low energy part first
>> 166 G4int i;
>> 167 G4double loss=0.;
>> 168 for (i=0; i<NumEl; i++)
>> 169 {
>> 170 G4bool isOut;
>> 171 G4int IndEl = (*elementVector)[i]->GetIndex();
>> 172 loss += atomicNumDensityVector[i]*
>> 173 (*aLossTable)[IndEl]->GetValue(tlim,isOut);
>> 174 }
>> 175 G4double taulim = tlim/aMass;
>> 176 G4double clim = sqrt(taulim)*loss;
>> 177 G4double taumax = maxEnergy/aMass;
>> 178
>> 179 // now the range vector can be filled
>> 180
>> 181 for ( i=0; i<TotBin; i++)
>> 182 {
>> 183 G4double LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i);
>> 184 G4double tau = LowEdgeEnergy/aMass;
>> 185
>> 186 if ( tau <= taulim ) {
>> 187 G4double Value = 2.*aMass*tau*sqrt(tau)/(3.*clim);
>> 188 rangeVector->PutValue(i,Value);
>> 189 } else {
>> 190 G4double rangelim = 2.*aMass*taulim*sqrt(taulim)/(3.*clim);
>> 191 G4double ltaulow = log(taulim);
>> 192 G4double ltauhigh = log(tau);
>> 193 G4double ltaumax = log(taumax);
>> 194 G4int nbin = G4int(maxnbint*(ltauhigh-ltaulow)/(ltaumax-ltaulow));
>> 195 if( nbin < 1 ) nbin = 1;
>> 196 G4double Value = RangeLogSimpson(elementVector, atomicNumDensityVector,
>> 197 aLossTable, aMass,
>> 198 ltaulow, ltauhigh,
>> 199 nbin, NumEl) + rangelim;
>> 200 rangeVector->PutValue(i,Value);
>> 201 }
>> 202 }
>> 203 }
90 204
91 G4Electron* G4Electron::Electron() 205 G4Electron* G4Electron::Electron()
92 { << 206 {
93 return Definition(); << 207 return &theElectron;
94 } 208 }
>> 209
>> 210
>> 211
>> 212
>> 213
>> 214
95 215