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25 // 22 //
26 // G4RToEConvForPositron class implementation <<
27 // 23 //
28 // Author: H.Kurashige, 05 October 2002 - Firs << 24 // $Id: G4RToEConvForPositron.cc,v 1.3 2004/12/02 06:53:56 kurasige Exp $
29 // ------------------------------------------- << 25 // GEANT4 tag $Name: geant4-07-00-patch-01 $
>> 26 //
>> 27 //
>> 28 // --------------------------------------------------------------
>> 29 // GEANT 4 class implementation file/ History:
>> 30 // 5 Oct. 2002, H.Kuirashige : Structure created based on object model
>> 31 // --------------------------------------------------------------
30 32
31 #include "G4RToEConvForPositron.hh" 33 #include "G4RToEConvForPositron.hh"
32 #include "G4ParticleDefinition.hh" 34 #include "G4ParticleDefinition.hh"
33 #include "G4ParticleTable.hh" 35 #include "G4ParticleTable.hh"
>> 36 #include "G4Material.hh"
>> 37 #include "G4PhysicsLogVector.hh"
>> 38
>> 39 #include "G4ios.hh"
>> 40 #include <iomanip>
>> 41 #include <strstream>
34 42
35 #include "G4PhysicalConstants.hh" << 43 G4RToEConvForPositron::G4RToEConvForPositron() : G4VRangeToEnergyConverter()
36 #include "G4SystemOfUnits.hh" <<
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 <<
41 // ------------------------------------------- <<
42 G4RToEConvForPositron::G4RToEConvForPositron() <<
43 : G4VRangeToEnergyConverter() <<
44 { 44 {
45 theParticle = G4ParticleTable::GetParticleTa << 45 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
46 if (theParticle == nullptr) << 46 if (theParticle ==0) {
47 { <<
48 #ifdef G4VERBOSE 47 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) << 48 if (GetVerboseLevel()>0) {
50 { << 49 G4cout << " G4RToEConvForPositron::G4RToEConvForPositron() ";
51 G4cout << "G4RToEConvForPositron::G4RToE << 50 G4cout << " Positron is not defined !!" << G4endl;
52 G4cout << "Positron is not defined !!" < <<
53 } 51 }
54 #endif 52 #endif
55 } << 53 }
56 else <<
57 { <<
58 fPDG = theParticle->GetPDGEncoding(); <<
59 } <<
60 } 54 }
61 55
62 // ------------------------------------------- << 56 G4RToEConvForPositron::~G4RToEConvForPositron()
63 G4RToEConvForPositron::~G4RToEConvForPositron( << 57 {
64 {} << 58 }
65 << 59
66 // ------------------------------------------- << 60
67 G4double G4RToEConvForPositron::ComputeValue(c <<
68 c <<
69 { <<
70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3 <<
71 const G4double Tlow=10.*CLHEP::keV, Thigh=1. <<
72 const G4double taul = Tlow/CLHEP::electron_m <<
73 const G4double logtaul = G4Log(taul); <<
74 const G4double taul12 = std::sqrt(taul); <<
75 const G4double bremfactor = 0.1; <<
76 <<
77 G4double Zlog = G4Pow::GetInstance()->logZ(Z <<
78 G4double ionpot = <<
79 1.6e-5*CLHEP::MeV*G4Exp(0.9*Zlog)/CLHEP::e <<
80 G4double ionpotlog = G4Log(ionpot); <<
81 61
82 G4double tau = kinEnergy/CLHEP::electron_mas <<
83 G4double dEdx = 0.0; <<
84 62
>> 63 // **********************************************************************
>> 64 // ************************* ComputeLoss ********************************
>> 65 // **********************************************************************
>> 66 G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
>> 67 G4double KineticEnergy) const
>> 68 {
>> 69 static G4double Z;
>> 70 static G4double taul, ionpot, ionpotlog;
>> 71 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
>> 72 const G4double Tlow=10.*keV, Thigh=1.*GeV;
>> 73 static G4double bremfactor = 0.1 ;
>> 74
>> 75 G4double Mass = theParticle->GetPDGMass();
>> 76 // calculate dE/dx for electrons
>> 77 if( std::abs(AtomicNumber-Z)>0.1 ) {
>> 78 Z = AtomicNumber;
>> 79 taul = Tlow/Mass;
>> 80 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 81 ionpotlog = std::log(ionpot);
>> 82 }
>> 83
>> 84 G4double tau = KineticEnergy/Mass;
>> 85 G4double dEdx;
85 86
86 if(tau<taul) << 87 if(tau<taul)
87 { 88 {
88 G4double t1 = taul+1.; 89 G4double t1 = taul+1.;
89 G4double t2 = taul+2.; 90 G4double t2 = taul+2.;
90 G4double tsq = taul*taul; 91 G4double tsq = taul*taul;
91 G4double beta2 = taul*t2/(t1*t1); 92 G4double beta2 = taul*t2/(t1*t1);
92 G4double f = 2.*logtaul - << 93 G4double f = 2.*std::log(taul)
93 (6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2 << 94 -(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
94 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 95 (t2*t2))/(t1*t1);
95 dEdx = (G4Log(2.*taul+4.)-2.*ionpotlog+f)/ << 96 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
96 dEdx *= Z*taul12/std::sqrt(tau); << 97 dEdx = twopi_mc2_rcl2*Z*dEdx;
97 } << 98 G4double clow = dEdx*std::sqrt(taul);
98 else << 99 dEdx = clow/std::sqrt(KineticEnergy/Mass);
99 { << 100
100 G4double t1 = tau+1.; << 101 } else {
>> 102 G4double t1 = tau+1.;
101 G4double t2 = tau+2.; 103 G4double t2 = tau+2.;
102 G4double tsq = tau*tau; 104 G4double tsq = tau*tau;
103 G4double beta2 = tau*t2/(t1*t1); 105 G4double beta2 = tau*t2/(t1*t1);
104 G4double f = 2.*G4Log(tau) - (6.*tau+1.5*t << 106 G4double f = 2.*std::log(tau)
105 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 107 - (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
106 dEdx = Z*(G4Log(2.*tau+4.)-2.*ionpotlog+f) << 108 (t2*t2))/(t1*t1);
>> 109 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 110 dEdx = twopi_mc2_rcl2*Z*dEdx;
107 111
108 // loss from bremsstrahlung follows 112 // loss from bremsstrahlung follows
109 G4double cbrem = (cbr1+cbr2*Z) 113 G4double cbrem = (cbr1+cbr2*Z)
110 * (cbr3+cbr4*G4Log(kinEnerg << 114 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
111 dEdx += cbrem*Z*(Z+1.)*bremfactor*tau/beta << 115 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 116 cbrem *= bremfactor ;
>> 117 dEdx += twopi_mc2_rcl2*cbrem;
112 } 118 }
113 return dEdx*CLHEP::twopi_mc2_rcl2; << 119 return dEdx;
114 } 120 }
115 121
116 // ------------------------------------------- << 122
>> 123
>> 124 void G4RToEConvForPositron::BuildRangeVector(const G4Material* aMaterial,
>> 125 G4double maxEnergy,
>> 126 G4double aMass,
>> 127 G4PhysicsLogVector* rangeVector)
>> 128 {
>> 129 // create range vector for a material
>> 130 const G4double tlim = 10.*keV;
>> 131 const G4int maxnbint = 100;
>> 132
>> 133 const G4ElementVector* elementVector = aMaterial->GetElementVector();
>> 134 const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
>> 135 G4int NumEl = aMaterial->GetNumberOfElements();
>> 136
>> 137 // calculate parameters of the low energy part first
>> 138 size_t i;
>> 139 G4double loss=0.;
>> 140 for (i=0; i<size_t(NumEl); i++) {
>> 141 G4bool isOut;
>> 142 G4int IndEl = (*elementVector)[i]->GetIndex();
>> 143 loss += atomicNumDensityVector[i]*
>> 144 (*theLossTable)[IndEl]->GetValue(tlim,isOut);
>> 145 }
>> 146 G4double taulim = tlim/aMass;
>> 147 G4double clim = std::sqrt(taulim)*loss;
>> 148 G4double taumax = maxEnergy/aMass;
>> 149
>> 150 // now the range vector can be filled
>> 151 for ( i=0; i<size_t(TotBin); i++) {
>> 152 G4double LowEdgeEnergy = rangeVector->GetLowEdgeEnergy(i);
>> 153 G4double tau = LowEdgeEnergy/aMass;
>> 154
>> 155 if ( tau <= taulim ) {
>> 156 G4double Value = 2.*aMass*tau*std::sqrt(tau)/(3.*clim);
>> 157 rangeVector->PutValue(i,Value);
>> 158 } else {
>> 159 G4double rangelim = 2.*aMass*taulim*std::sqrt(taulim)/(3.*clim);
>> 160 G4double ltaulow = std::log(taulim);
>> 161 G4double ltauhigh = std::log(tau);
>> 162 G4double ltaumax = std::log(taumax);
>> 163 G4int nbin = G4int(maxnbint*(ltauhigh-ltaulow)/(ltaumax-ltaulow));
>> 164 if( nbin < 1 ) nbin = 1;
>> 165 G4double Value = RangeLogSimpson( NumEl, elementVector,
>> 166 atomicNumDensityVector, aMass,
>> 167 ltaulow, ltauhigh, nbin)
>> 168 + rangelim;
>> 169 rangeVector->PutValue(i,Value);
>> 170 }
>> 171 }
>> 172 }
117 173