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25 // 25 //
26 // G4RToEConvForPositron class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 05 October 2002 - Firs << 27 // $Id: G4RToEConvForPositron.cc,v 1.5.4.2 2010/01/26 13:56:43 gcosmo Exp $
29 // ------------------------------------------- << 28 // GEANT4 tag $Name: geant4-09-02-patch-04 $
>> 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 "G4RToEConvForPositron.hh" 36 #include "G4RToEConvForPositron.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 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 { 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 << " G4RToEConvForPositron::G4RToEConvForPositron() ";
51 G4cout << "G4RToEConvForPositron::G4RToE << 51 G4cout << " Positron is not defined !!" << G4endl;
52 G4cout << "Positron 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 G4RToEConvForPositron::~G4RToEConvForPositron()
63 G4RToEConvForPositron::~G4RToEConvForPositron( << 58 {
64 {} << 59 }
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 60
82 G4double tau = kinEnergy/CLHEP::electron_mas <<
83 G4double dEdx = 0.0; <<
84 61
85 62
86 if(tau<taul) << 63
>> 64 // **********************************************************************
>> 65 // ************************* ComputeLoss ********************************
>> 66 // **********************************************************************
>> 67 G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
>> 68 G4double KineticEnergy) const
>> 69 {
>> 70 static G4double Z;
>> 71 static G4double taul, ionpot, ionpotlog;
>> 72 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
>> 73 const G4double Tlow=10.*keV, Thigh=1.*GeV;
>> 74 static G4double bremfactor = 0.1 ;
>> 75
>> 76 G4double Mass = theParticle->GetPDGMass();
>> 77 // calculate dE/dx for electrons
>> 78 if( std::fabs(AtomicNumber-Z)>0.1 ) {
>> 79 Z = AtomicNumber;
>> 80 taul = Tlow/Mass;
>> 81 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
>> 82 ionpotlog = std::log(ionpot);
>> 83 }
>> 84
>> 85 G4double tau = KineticEnergy/Mass;
>> 86 G4double dEdx;
>> 87
>> 88 if(tau<taul)
87 { 89 {
88 G4double t1 = taul+1.; 90 G4double t1 = taul+1.;
89 G4double t2 = taul+2.; 91 G4double t2 = taul+2.;
90 G4double tsq = taul*taul; 92 G4double tsq = taul*taul;
91 G4double beta2 = taul*t2/(t1*t1); 93 G4double beta2 = taul*t2/(t1*t1);
92 G4double f = 2.*logtaul - << 94 G4double f = 2.*std::log(taul)
93 (6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2 << 95 -(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); << 96 (t2*t2))/(t1*t1);
95 dEdx = (G4Log(2.*taul+4.)-2.*ionpotlog+f)/ << 97 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
96 dEdx *= Z*taul12/std::sqrt(tau); << 98 dEdx = twopi_mc2_rcl2*Z*dEdx;
97 } << 99 G4double clow = dEdx*std::sqrt(taul);
98 else << 100 dEdx = clow/std::sqrt(KineticEnergy/Mass);
99 { << 101
100 G4double t1 = tau+1.; << 102 } else {
>> 103 G4double t1 = tau+1.;
101 G4double t2 = tau+2.; 104 G4double t2 = tau+2.;
102 G4double tsq = tau*tau; 105 G4double tsq = tau*tau;
103 G4double beta2 = tau*t2/(t1*t1); 106 G4double beta2 = tau*t2/(t1*t1);
104 G4double f = 2.*G4Log(tau) - (6.*tau+1.5*t << 107 G4double f = 2.*std::log(tau)
105 -tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1); << 108 - (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) << 109 (t2*t2))/(t1*t1);
>> 110 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 111 dEdx = twopi_mc2_rcl2*Z*dEdx;
107 112
108 // loss from bremsstrahlung follows 113 // loss from bremsstrahlung follows
109 G4double cbrem = (cbr1+cbr2*Z) 114 G4double cbrem = (cbr1+cbr2*Z)
110 * (cbr3+cbr4*G4Log(kinEnerg << 115 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
111 dEdx += cbrem*Z*(Z+1.)*bremfactor*tau/beta << 116 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 117 cbrem *= bremfactor ;
>> 118 dEdx += twopi_mc2_rcl2*cbrem;
112 } 119 }
113 return dEdx*CLHEP::twopi_mc2_rcl2; << 120 return dEdx;
114 } 121 }
115 122
116 // ------------------------------------------- << 123
117 124