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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" << 44
38 #include "G4Log.hh" << 45 G4RToEConvForPositron::G4RToEConvForPositron() : G4VRangeToEnergyConverter()
39 #include "G4Exp.hh" <<
40 <<
41 // ------------------------------------------- <<
42 G4RToEConvForPositron::G4RToEConvForPositron() <<
43 : G4VRangeToEnergyConverter() <<
44 { 46 {
45 theParticle = G4ParticleTable::GetParticleTa << 47 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
46 if (theParticle == nullptr) << 48 if (theParticle ==0) {
47 { <<
48 #ifdef G4VERBOSE 49 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) << 50 if (GetVerboseLevel()>0) {
50 { << 51 G4cout << " G4RToEConvForPositron::G4RToEConvForPositron() ";
51 G4cout << "G4RToEConvForPositron::G4RToE << 52 G4cout << " Positron is not defined !!" << G4endl;
52 G4cout << "Positron is not defined !!" < <<
53 } 53 }
54 #endif 54 #endif
55 } << 55 }
56 else <<
57 { <<
58 fPDG = theParticle->GetPDGEncoding(); <<
59 } <<
60 } 56 }
61 57
62 // ------------------------------------------- << 58 G4RToEConvForPositron::~G4RToEConvForPositron()
63 G4RToEConvForPositron::~G4RToEConvForPositron( << 59 {
64 {} << 60 }
65 <<
66 // ------------------------------------------- <<
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
85 63
86 if(tau<taul) << 64
>> 65 // **********************************************************************
>> 66 // ************************* ComputeLoss ********************************
>> 67 // **********************************************************************
>> 68 G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
>> 69 G4double KineticEnergy) const
>> 70 {
>> 71 static G4double Z;
>> 72 static G4double taul, ionpot, ionpotlog;
>> 73 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
>> 74 const G4double Tlow=10.*keV, Thigh=1.*GeV;
>> 75 static G4double bremfactor = 0.1 ;
>> 76
>> 77 G4double Mass = theParticle->GetPDGMass();
>> 78 // calculate dE/dx for electrons
>> 79 if( std::fabs(AtomicNumber-Z)>0.1 ) {
>> 80 Z = AtomicNumber;
>> 81 taul = Tlow/Mass;
>> 82 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 83 ionpotlog = std::log(ionpot);
>> 84 }
>> 85
>> 86 G4double tau = KineticEnergy/Mass;
>> 87 G4double dEdx;
>> 88
>> 89 if(tau<taul)
87 { 90 {
88 G4double t1 = taul+1.; 91 G4double t1 = taul+1.;
89 G4double t2 = taul+2.; 92 G4double t2 = taul+2.;
90 G4double tsq = taul*taul; 93 G4double tsq = taul*taul;
91 G4double beta2 = taul*t2/(t1*t1); 94 G4double beta2 = taul*t2/(t1*t1);
92 G4double f = 2.*logtaul - << 95 G4double f = 2.*std::log(taul)
93 (6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2 << 96 -(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); << 97 (t2*t2))/(t1*t1);
95 dEdx = (G4Log(2.*taul+4.)-2.*ionpotlog+f)/ << 98 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
96 dEdx *= Z*taul12/std::sqrt(tau); << 99 dEdx = twopi_mc2_rcl2*Z*dEdx;
97 } << 100 G4double clow = dEdx*std::sqrt(taul);
98 else << 101 dEdx = clow/std::sqrt(KineticEnergy/Mass);
99 { << 102
100 G4double t1 = tau+1.; << 103 } else {
>> 104 G4double t1 = tau+1.;
101 G4double t2 = tau+2.; 105 G4double t2 = tau+2.;
102 G4double tsq = tau*tau; 106 G4double tsq = tau*tau;
103 G4double beta2 = tau*t2/(t1*t1); 107 G4double beta2 = tau*t2/(t1*t1);
104 G4double f = 2.*G4Log(tau) - (6.*tau+1.5*t << 108 G4double f = 2.*std::log(tau)
105 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 109 - (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) << 110 (t2*t2))/(t1*t1);
>> 111 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 112 dEdx = twopi_mc2_rcl2*Z*dEdx;
107 113
108 // loss from bremsstrahlung follows 114 // loss from bremsstrahlung follows
109 G4double cbrem = (cbr1+cbr2*Z) 115 G4double cbrem = (cbr1+cbr2*Z)
110 * (cbr3+cbr4*G4Log(kinEnerg << 116 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
111 dEdx += cbrem*Z*(Z+1.)*bremfactor*tau/beta << 117 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 118 cbrem *= bremfactor ;
>> 119 dEdx += twopi_mc2_rcl2*cbrem;
112 } 120 }
113 return dEdx*CLHEP::twopi_mc2_rcl2; << 121 return dEdx;
114 } 122 }
115 123
116 // ------------------------------------------- << 124
117 125