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>> 1 // This code implementation is the intellectual property of
>> 2 // the GEANT4 collaboration.
1 // 3 //
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4 // * << 6 // and all its terms.
5 // * The Geant4 software is copyright of th <<
6 // * the Geant4 Collaboration. It is provided <<
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8 // * LICENSE and available at http://cern.ch/ <<
9 // * include a list of copyright holders. <<
10 // * <<
11 // * Neither the authors of this software syst <<
12 // * institutes,nor the agencies providing fin <<
13 // * work make any representation or warran <<
14 // * regarding this software system or assum <<
15 // * use. Please see the license in the file <<
16 // * for the full disclaimer and the limitatio <<
17 // * <<
18 // * This code implementation is the result <<
19 // * technical work of the GEANT4 collaboratio <<
20 // * By using, copying, modifying or distri <<
21 // * any work based on the software) you ag <<
22 // * use in resulting scientific publicati <<
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* <<
25 // 7 //
>> 8 // $Id: G4Electron.cc,v 1.1.10.1.2.2 1999/12/14 07:08:13 gunter Exp $
>> 9 // GEANT4 tag $Name: geant4-01-01 $
>> 10 //
>> 11 //
26 // ------------------------------------------- 12 // ----------------------------------------------------------------------
27 // GEANT 4 class implementation file 13 // GEANT 4 class implementation file
28 // 14 //
>> 15 // For information related to this code contact:
>> 16 // CERN, CN Division, ASD Group
29 // History: first implementation, based o 17 // History: first implementation, based on object model of
30 // 4th April 1996, G.Cosmo 18 // 4th April 1996, G.Cosmo
31 // ******************************************* 19 // **********************************************************************
32 // New impelemenataion as an utility class M << 20 // Added particle definitions, H.Kurashige, 19 April 1996
>> 21 // Added SetCuts implementation, L.Urban, 30 May 1996
>> 22 // Revised, G.Cosmo, 6 June 1996
>> 23 // Code uses operators (+=, *=, ++, -> etc.) correctly, P. Urban, 26/6/96
>> 24 // Add ElectronDefinition() H.Kurashige 4 July 1996
33 // ------------------------------------------- 25 // ----------------------------------------------------------------------
34 26
>> 27 #include "g4std/fstream"
>> 28 #include "g4std/iomanip"
>> 29
35 #include "G4Electron.hh" 30 #include "G4Electron.hh"
>> 31 // ######################################################################
>> 32 // ### ELECTRON ###
>> 33 // ######################################################################
>> 34
>> 35 G4Electron::G4Electron(
>> 36 const G4String& aName, G4double mass,
>> 37 G4double width, G4double charge,
>> 38 G4int iSpin, G4int iParity,
>> 39 G4int iConjugation, G4int iIsospin,
>> 40 G4int iIsospin3, G4int gParity,
>> 41 const G4String& pType, G4int lepton,
>> 42 G4int baryon, G4int encoding,
>> 43 G4bool stable, G4double lifetime,
>> 44 G4DecayTable *decaytable )
>> 45 : G4VLepton( aName,mass,width,charge,iSpin,iParity,
>> 46 iConjugation,iIsospin,iIsospin3,gParity,pType,
>> 47 lepton,baryon,encoding,stable,lifetime,decaytable )
>> 48 {
>> 49 }
36 50
37 #include "G4ParticleTable.hh" << 51 // ......................................................................
38 #include "G4PhysicalConstants.hh" << 52 // ... static member definitions ...
39 #include "G4String.hh" << 53 // ......................................................................
40 #include "G4SystemOfUnits.hh" << 54 //
41 #include "G4Types.hh" << 55 // Arguments for constructor are as follows
42 << 56 // name mass width charge
43 G4Electron* G4Electron::theInstance = nullptr; << 57 // 2*spin parity C-conjugation
>> 58 // 2*Isospin 2*Isospin3 G-parity
>> 59 // type lepton number baryon number PDG encoding
>> 60 // stable lifetime decay table
>> 61
>> 62 G4Electron G4Electron::theElectron(
>> 63 "e-", 0.51099906*MeV, 0.0*MeV, -1.*eplus,
>> 64 1, 0, 0,
>> 65 0, 0, 0,
>> 66 "lepton", 1, 0, 11,
>> 67 true, -1.0, NULL
>> 68 );
>> 69
>> 70 G4Electron* G4Electron::ElectronDefinition(){return &theElectron;}
>> 71 // initialization for static cut values
>> 72 G4double G4Electron::theElectronLengthCut = -1.0;
>> 73 G4double* G4Electron::theElectronKineticEnergyCuts = NULL;
44 74
45 G4Electron* G4Electron::Definition() << 75 // **********************************************************************
>> 76 // ************************* ComputeLoss ********************************
>> 77 // **********************************************************************
>> 78 G4double G4Electron::ComputeLoss(G4double AtomicNumber,
>> 79 G4double KineticEnergy) const
46 { 80 {
47 if (theInstance != nullptr) return theInstan << 81 static G4double Z;
48 const G4String name = "e-"; << 82 static G4double taul, ionpot, ionpotlog;
49 // search in particle table] << 83 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
50 G4ParticleTable* pTable = G4ParticleTable::G << 84 const G4double Tlow=10.*keV, Thigh=1.*GeV;
51 G4ParticleDefinition* anInstance = pTable->F << 85
52 if (anInstance == nullptr) { << 86 static G4double bremfactor= 0.1 ;
53 // create particle << 87
54 // << 88 // calculate dE/dx for electrons
55 // Arguments for constructor are as fol << 89 if( abs(AtomicNumber-Z)>0.1 )
56 // name mass << 90 {
57 // 2*spin parity C- << 91 Z = AtomicNumber;
58 // 2*Isospin 2*Isospin3 << 92 taul = Tlow/GetPDGMass();
59 // type lepton number ba << 93 ionpot = 1.6e-5*MeV*exp(0.9*log(Z))/GetPDGMass();
60 // stable lifetime << 94 ionpotlog = log(ionpot);
61 // shortlived subType << 95 }
62 << 96
63 // use constants in CLHEP << 97
64 // static const double electron_mass_c2 = << 98 G4double tau = KineticEnergy/GetPDGMass();
65 << 99 G4double dEdx;
66 // clang-format off << 100
67 anInstance = new G4ParticleDefinition( << 101 if(tau<taul) {
68 name, electron_mass_c2, << 102 G4double t1 = taul+1.;
69 1, 0, 0, << 103 G4double t2 = taul+2.;
70 0, 0, 0, << 104 G4double tsq = taul*taul;
71 "lepton", 1, << 105 G4double beta2 = taul*t2/(t1*t1);
72 true, -1.0, nullptr << 106 G4double f = 1.-beta2+log(tsq/2.)
73 false, "e" << 107 +(0.5+0.25*tsq+(1.+2.*taul)*log(0.5))/(t1*t1);
74 ); << 108 dEdx = (log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
75 // clang-format on << 109 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 110 G4double clow = dEdx*sqrt(taul);
>> 111 dEdx = clow/sqrt(KineticEnergy/GetPDGMass());
>> 112 } else {
>> 113 G4double t1 = tau+1.;
>> 114 G4double t2 = tau+2.;
>> 115 G4double tsq = tau*tau;
>> 116 G4double beta2 = tau*t2/(t1*t1);
>> 117 G4double f = 1.-beta2+log(tsq/2.)
>> 118 +(0.5+0.25*tsq+(1.+2.*tau)*log(0.5))/(t1*t1);
>> 119 dEdx = (log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 120 dEdx = twopi_mc2_rcl2*Z*dEdx;
>> 121
>> 122 // loss from bremsstrahlung follows
>> 123 G4double cbrem = (cbr1+cbr2*Z)
>> 124 *(cbr3+cbr4*log(KineticEnergy/Thigh));
>> 125 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
76 126
77 // Bohr Magnetron << 127 cbrem *= bremfactor ;
78 G4double muB = -0.5 * eplus * hbar_Planck <<
79 128
80 anInstance->SetPDGMagneticMoment(muB * 1.0 << 129 dEdx += twopi_mc2_rcl2*cbrem;
81 } 130 }
82 theInstance = static_cast<G4Electron*>(anIns <<
83 return theInstance; <<
84 } <<
85 131
86 G4Electron* G4Electron::ElectronDefinition() << 132 return dEdx;
87 { <<
88 return Definition(); <<
89 } 133 }
90 134
91 G4Electron* G4Electron::Electron() << 135 // **********************************************************************
>> 136 // *********************** BuildRangeVector *****************************
>> 137 // **********************************************************************
>> 138
>> 139 void G4Electron::BuildRangeVector(const G4Material* aMaterial,
>> 140 const G4LossTable* aLossTable,
>> 141 G4double maxEnergy,
>> 142 G4double aMass,
>> 143 G4PhysicsLogVector* rangeVector)
92 { 144 {
93 return Definition(); << 145 // create range vector for a material
94 } << 146 const G4double tlim = 10.*keV;
>> 147 const G4int maxnbint = 100;
>> 148
>> 149 const G4ElementVector* elementVector = aMaterial->GetElementVector();
>> 150 const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
>> 151 G4int NumEl = aMaterial->GetNumberOfElements();
>> 152
>> 153 // calculate parameters of the low energy part first
>> 154 G4int i;
>> 155 G4double loss=0.;
>> 156 for (i=0; i<NumEl; i++)
>> 157 {
>> 158 G4bool isOut;
>> 159 G4int IndEl = (*elementVector)(i)->GetIndex();
>> 160 loss += atomicNumDensityVector[i]*
>> 161 (*aLossTable)[IndEl]->GetValue(tlim,isOut);
>> 162 }
>> 163 G4double taulim = tlim/aMass;
>> 164 G4double clim = sqrt(taulim)*loss;
>> 165 G4double taumax = maxEnergy/aMass;
>> 166
>> 167 // now the range vector can be filled
>> 168
>> 169 for ( i=0; i<TotBin; i++)
>> 170 {
>> 171 G4double LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i);
>> 172 G4double tau = LowEdgeEnergy/aMass;
>> 173
>> 174 if ( tau <= taulim ) {
>> 175 G4double Value = 2.*aMass*tau*sqrt(tau)/(3.*clim);
>> 176 rangeVector->PutValue(i,Value);
>> 177 } else {
>> 178 G4double rangelim = 2.*aMass*taulim*sqrt(taulim)/(3.*clim);
>> 179 G4double ltaulow = log(taulim);
>> 180 G4double ltauhigh = log(tau);
>> 181 G4double ltaumax = log(taumax);
>> 182 G4int nbin = G4int(maxnbint*(ltauhigh-ltaulow)/(ltaumax-ltaulow));
>> 183 if( nbin < 1 ) nbin = 1;
>> 184 G4double Value = RangeLogSimpson(elementVector, atomicNumDensityVector,
>> 185 aLossTable, aMass,
>> 186 ltaulow, ltauhigh,
>> 187 nbin, NumEl) + rangelim;
>> 188 rangeVector->PutValue(i,Value);
>> 189 }
>> 190 }
>> 191 }
>> 192
>> 193
>> 194
>> 195
>> 196
>> 197
95 198