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26 // G4RToEConvForElectron class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 05 October 2002 - Firs << 27 // $Id: G4RToEConvForElectron.cc,v 1.5.4.1 2009/08/11 12:45:18 gcosmo Exp $
29 // ------------------------------------------- << 28 // GEANT4 tag $Name: geant4-09-02-patch-02 $
>> 29 //
>> 30 //
>> 31 // --------------------------------------------------------------
>> 32 // GEANT 4 class implementation file/ History:
>> 33 // 5 Oct. 2002, H.Kuirashige : Structure created based on object model
>> 34 // --------------------------------------------------------------
30 35
31 #include "G4RToEConvForElectron.hh" 36 #include "G4RToEConvForElectron.hh"
32 #include "G4ParticleDefinition.hh" 37 #include "G4ParticleDefinition.hh"
33 #include "G4ParticleTable.hh" 38 #include "G4ParticleTable.hh"
>> 39 #include "G4Material.hh"
>> 40 #include "G4PhysicsLogVector.hh"
>> 41
>> 42 #include "G4ios.hh"
34 43
35 #include "G4PhysicalConstants.hh" << 44 G4RToEConvForElectron::G4RToEConvForElectron() : G4VRangeToEnergyConverter()
36 #include "G4SystemOfUnits.hh" <<
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 <<
41 // ------------------------------------------- <<
42 G4RToEConvForElectron::G4RToEConvForElectron() <<
43 : G4VRangeToEnergyConverter() <<
44 { 45 {
45 theParticle = G4ParticleTable::GetParticleTa << 46 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
46 if (theParticle == nullptr ) << 47 if (theParticle ==0) {
47 { <<
48 #ifdef G4VERBOSE 48 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) << 49 if (GetVerboseLevel()>0) {
50 { << 50 G4cout << " G4RToEConvForElectron::G4RToEConvForElectron() ";
51 G4cout << "G4RToEConvForElectron::G4RToE << 51 G4cout << " Electron is not defined !!" << G4endl;
52 G4cout << "Electron is not defined !!" < <<
53 } 52 }
54 #endif 53 #endif
55 } << 54 }
56 else <<
57 { <<
58 fPDG = theParticle->GetPDGEncoding(); <<
59 } <<
60 } 55 }
61 56
62 // ------------------------------------------- << 57 G4RToEConvForElectron::~G4RToEConvForElectron()
63 G4RToEConvForElectron::~G4RToEConvForElectron( << 58 {
64 {} << 59 }
65 << 60
66 // ------------------------------------------- << 61
67 G4double G4RToEConvForElectron::ComputeValue(c << 62 // **********************************************************************
68 c << 63 // ************************* ComputeLoss ********************************
>> 64 // **********************************************************************
>> 65 G4double G4RToEConvForElectron::ComputeLoss(G4double AtomicNumber,
>> 66 G4double KineticEnergy) const
69 { 67 {
70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3 << 68 static G4double Z;
71 const G4double Tlow=10.*CLHEP::keV, Thigh=1. << 69 static G4double taul, ionpot, ionpotlog;
72 const G4double taul = Tlow/CLHEP::electron_m << 70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
73 const G4double log05 = G4Log(0.5); << 71 const G4double Tlow=10.*keV, Thigh=1.*GeV;
74 const G4double taul12 = std::sqrt(taul); << 72 static G4double bremfactor= 0.1 ;
75 const G4double bremfactor = 0.1; << 73
76 << 74 G4double Mass = theParticle->GetPDGMass();
77 const G4double Zlog = G4Pow::GetInstance()-> << 75 // calculate dE/dx for electrons
78 const G4double ionpot = << 76 if( std::fabs(AtomicNumber-Z)>0.1 ) {
79 1.6e-5*CLHEP::MeV*G4Exp(0.9*Zlog)/CLHEP::e << 77 Z = AtomicNumber;
80 const G4double ionpotlog = G4Log(ionpot); << 78 taul = Tlow/Mass;
>> 79 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 80 ionpotlog = std::log(ionpot);
>> 81 }
>> 82
81 83
82 const G4double tau = kinEnergy/CLHEP::electr << 84 G4double tau = KineticEnergy/Mass;
83 G4double dEdx = 0.0; << 85 G4double dEdx;
84 86
85 if(tau<taul) << 87 if(tau<taul) {
86 { <<
87 G4double t1 = taul+1.; 88 G4double t1 = taul+1.;
88 G4double t2 = taul+2.; 89 G4double t2 = taul+2.;
89 G4double tsq = taul*taul; 90 G4double tsq = taul*taul;
90 G4double beta2 = taul*t2/(t1*t1); 91 G4double beta2 = taul*t2/(t1*t1);
91 G4double f = 1.-beta2+G4Log(tsq/2.) << 92 G4double f = 1.-beta2+std::log(tsq/2.)
92 +(0.5+0.25*tsq+(1.+2.*taul)*log << 93 +(0.5+0.25*tsq+(1.+2.*taul)*std::log(0.5))/(t1*t1);
93 dEdx = Z*(G4Log(2.*taul+4.)-2.*ionpotlog+f << 94 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
94 dEdx *= taul12/std::sqrt(tau); << 95 dEdx = twopi_mc2_rcl2*Z*dEdx;
95 } << 96 G4double clow = dEdx*std::sqrt(taul);
96 else << 97 dEdx = clow/std::sqrt(KineticEnergy/Mass);
97 { << 98
>> 99 } else {
98 G4double t1 = tau+1.; 100 G4double t1 = tau+1.;
99 G4double t2 = tau+2.; 101 G4double t2 = tau+2.;
100 G4double tsq = tau*tau; 102 G4double tsq = tau*tau;
101 G4double beta2 = tau*t2/(t1*t1); 103 G4double beta2 = tau*t2/(t1*t1);
102 G4double f = 1.-beta2+G4Log(tsq/2.) << 104 G4double f = 1.-beta2+std::log(tsq/2.)
103 +(0.5+0.25*tsq+(1.+2.*tau)* << 105 +(0.5+0.25*tsq+(1.+2.*tau)*std::log(0.5))/(t1*t1);
104 dEdx = Z*(G4Log(2.*tau+4.)-2.*ionpotlog+f) << 106 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 107 dEdx = twopi_mc2_rcl2*Z*dEdx;
105 108
106 // loss from bremsstrahlung follows 109 // loss from bremsstrahlung follows
107 G4double cbrem = (cbr1+cbr2*Z)*(cbr3+cbr4* << 110 G4double cbrem = (cbr1+cbr2*Z)
108 dEdx += Z*(Z+1)*cbrem*bremfactor*tau/beta2 << 111 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
>> 112 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 113
>> 114 cbrem *= bremfactor ;
>> 115
>> 116 dEdx += twopi_mc2_rcl2*cbrem;
109 } 117 }
110 118
111 return dEdx*CLHEP::twopi_mc2_rcl2; << 119 return dEdx;
112 } 120 }
113 121
114 // ------------------------------------------- << 122
>> 123 void G4RToEConvForElectron::BuildRangeVector(const G4Material* aMaterial,
>> 124 G4double maxEnergy,
>> 125 G4double aMass,
>> 126 G4PhysicsLogVector* rangeVector)
>> 127 {
>> 128 // create range vector for a material
>> 129 const G4double tlim = 10.*keV;
>> 130 const G4int maxnbint = 100;
>> 131
>> 132 const G4ElementVector* elementVector = aMaterial->GetElementVector();
>> 133 const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
>> 134 G4int NumEl = aMaterial->GetNumberOfElements();
>> 135
>> 136 // calculate parameters of the low energy part first
>> 137 size_t i;
>> 138 G4double loss=0.;
>> 139 for (i=0; i<size_t(NumEl); i++) {
>> 140 G4bool isOut;
>> 141 G4int IndEl = (*elementVector)[i]->GetIndex();
>> 142 loss += atomicNumDensityVector[i]*
>> 143 (*theLossTable)[IndEl]->GetValue(tlim,isOut);
>> 144 }
>> 145 G4double taulim = tlim/aMass;
>> 146 G4double clim = std::sqrt(taulim)*loss;
>> 147 G4double taumax = maxEnergy/aMass;
>> 148
>> 149 // now the range vector can be filled
>> 150 for ( i=0; i<size_t(TotBin); i++) {
>> 151 G4double LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i);
>> 152 G4double tau = LowEdgeEnergy/aMass;
>> 153
>> 154 if ( tau <= taulim ) {
>> 155 G4double Value = 2.*aMass*tau*std::sqrt(tau)/(3.*clim);
>> 156 rangeVector->PutValue(i,Value);
>> 157 } else {
>> 158 G4double rangelim = 2.*aMass*taulim*std::sqrt(taulim)/(3.*clim);
>> 159 G4double ltaulow = std::log(taulim);
>> 160 G4double ltauhigh = std::log(tau);
>> 161 G4double ltaumax = std::log(taumax);
>> 162 G4int nbin = G4int(maxnbint*(ltauhigh-ltaulow)/(ltaumax-ltaulow));
>> 163 if( nbin < 1 ) nbin = 1;
>> 164 G4double Value = RangeLogSimpson( NumEl, elementVector,
>> 165 atomicNumDensityVector, aMass,
>> 166 ltaulow, ltauhigh, nbin)
>> 167 + rangelim;
>> 168 rangeVector->PutValue(i,Value);
>> 169 }
>> 170 }
>> 171 }
115 172