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25 // 25 //
26 // G4RToEConvForPositron class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 05 October 2002 - Firs << 27 // $Id$
29 // ------------------------------------------- << 28 //
>> 29 //
>> 30 // --------------------------------------------------------------
>> 31 // GEANT 4 class implementation file/ History:
>> 32 // 5 Oct. 2002, H.Kuirashige : Structure created based on object model
>> 33 // --------------------------------------------------------------
30 34
31 #include "G4RToEConvForPositron.hh" 35 #include "G4RToEConvForPositron.hh"
32 #include "G4ParticleDefinition.hh" 36 #include "G4ParticleDefinition.hh"
33 #include "G4ParticleTable.hh" 37 #include "G4ParticleTable.hh"
>> 38 #include "G4Material.hh"
>> 39 #include "G4PhysicsLogVector.hh"
34 40
>> 41 #include "G4ios.hh"
35 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
36 #include "G4SystemOfUnits.hh" 43 #include "G4SystemOfUnits.hh"
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 44
41 // ------------------------------------------- <<
42 G4RToEConvForPositron::G4RToEConvForPositron() 45 G4RToEConvForPositron::G4RToEConvForPositron()
43 : G4VRangeToEnergyConverter() << 46 : G4VRangeToEnergyConverter(),
>> 47 Mass(0.0),
>> 48 Z(-1.),
>> 49 taul(0.0),
>> 50 ionpot(0.0),
>> 51 ionpotlog(-1.0e-10),
>> 52 bremfactor(0.1)
44 { 53 {
45 theParticle = G4ParticleTable::GetParticleTa << 54 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
46 if (theParticle == nullptr) << 55 if (theParticle ==0) {
47 { <<
48 #ifdef G4VERBOSE 56 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) << 57 if (GetVerboseLevel()>0) {
50 { << 58 G4cout << " G4RToEConvForPositron::G4RToEConvForPositron() ";
51 G4cout << "G4RToEConvForPositron::G4RToE << 59 G4cout << " Positron is not defined !!" << G4endl;
52 G4cout << "Positron is not defined !!" < <<
53 } 60 }
54 #endif 61 #endif
>> 62 } else {
>> 63 Mass = theParticle->GetPDGMass();
55 } 64 }
56 else <<
57 { <<
58 fPDG = theParticle->GetPDGEncoding(); <<
59 } <<
60 } 65 }
61 66
62 // ------------------------------------------- << 67 G4RToEConvForPositron::~G4RToEConvForPositron()
63 G4RToEConvForPositron::~G4RToEConvForPositron( << 68 {
64 {} << 69 }
65 << 70
66 // ------------------------------------------- << 71
67 G4double G4RToEConvForPositron::ComputeValue(c << 72
68 c << 73
>> 74 // **********************************************************************
>> 75 // ************************* ComputeLoss ********************************
>> 76 // **********************************************************************
>> 77 G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
>> 78 G4double KineticEnergy)
69 { 79 {
70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3 << 80 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
71 const G4double Tlow=10.*CLHEP::keV, Thigh=1. << 81 const G4double Tlow=10.*keV, Thigh=1.*GeV;
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 82
82 G4double tau = kinEnergy/CLHEP::electron_mas << 83 // calculate dE/dx for electrons
83 G4double dEdx = 0.0; << 84 if( std::fabs(AtomicNumber-Z)>0.1 ) {
>> 85 Z = AtomicNumber;
>> 86 taul = Tlow/Mass;
>> 87 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 88 ionpotlog = std::log(ionpot);
>> 89 }
84 90
>> 91 G4double tau = KineticEnergy/Mass;
>> 92 G4double dEdx;
85 93
86 if(tau<taul) << 94 if(tau<taul)
87 { 95 {
88 G4double t1 = taul+1.; 96 G4double t1 = taul+1.;
89 G4double t2 = taul+2.; 97 G4double t2 = taul+2.;
90 G4double tsq = taul*taul; 98 G4double tsq = taul*taul;
91 G4double beta2 = taul*t2/(t1*t1); 99 G4double beta2 = taul*t2/(t1*t1);
92 G4double f = 2.*logtaul - << 100 G4double f = 2.*std::log(taul)
93 (6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2 << 101 -(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); << 102 (t2*t2))/(t1*t1);
95 dEdx = (G4Log(2.*taul+4.)-2.*ionpotlog+f)/ << 103 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
96 dEdx *= Z*taul12/std::sqrt(tau); << 104 dEdx = twopi_mc2_rcl2*Z*dEdx;
97 } << 105 G4double clow = dEdx*std::sqrt(taul);
98 else << 106 dEdx = clow/std::sqrt(KineticEnergy/Mass);
99 { << 107
100 G4double t1 = tau+1.; << 108 } else {
>> 109 G4double t1 = tau+1.;
101 G4double t2 = tau+2.; 110 G4double t2 = tau+2.;
102 G4double tsq = tau*tau; 111 G4double tsq = tau*tau;
103 G4double beta2 = tau*t2/(t1*t1); 112 G4double beta2 = tau*t2/(t1*t1);
104 G4double f = 2.*G4Log(tau) - (6.*tau+1.5*t << 113 G4double f = 2.*std::log(tau)
105 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 114 - (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) << 115 (t2*t2))/(t1*t1);
>> 116 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 117 dEdx = twopi_mc2_rcl2*Z*dEdx;
107 118
108 // loss from bremsstrahlung follows 119 // loss from bremsstrahlung follows
109 G4double cbrem = (cbr1+cbr2*Z) 120 G4double cbrem = (cbr1+cbr2*Z)
110 * (cbr3+cbr4*G4Log(kinEnerg << 121 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
111 dEdx += cbrem*Z*(Z+1.)*bremfactor*tau/beta << 122 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 123 cbrem *= bremfactor ;
>> 124 dEdx += twopi_mc2_rcl2*cbrem;
112 } 125 }
113 return dEdx*CLHEP::twopi_mc2_rcl2; << 126 return dEdx;
114 } 127 }
115 128
116 // ------------------------------------------- << 129
117 130