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25 // 25 //
26 // G4RToEConvForElectron class implementation <<
27 // 26 //
28 // Author: H.Kurashige, 05 October 2002 - Firs << 27 //
29 // ------------------------------------------- << 28 //
>> 29 // --------------------------------------------------------------
>> 30 // GEANT 4 class implementation file/ History:
>> 31 // 5 Oct. 2002, H.Kuirashige : Structure created based on object model
>> 32 // --------------------------------------------------------------
30 33
31 #include "G4RToEConvForElectron.hh" 34 #include "G4RToEConvForElectron.hh"
32 #include "G4ParticleDefinition.hh" 35 #include "G4ParticleDefinition.hh"
33 #include "G4ParticleTable.hh" 36 #include "G4ParticleTable.hh"
>> 37 #include "G4Material.hh"
>> 38 #include "G4PhysicsLogVector.hh"
34 39
>> 40 #include "G4ios.hh"
35 #include "G4PhysicalConstants.hh" 41 #include "G4PhysicalConstants.hh"
36 #include "G4SystemOfUnits.hh" 42 #include "G4SystemOfUnits.hh"
37 #include "G4Pow.hh" <<
38 #include "G4Log.hh" <<
39 #include "G4Exp.hh" <<
40 43
41 // ------------------------------------------- <<
42 G4RToEConvForElectron::G4RToEConvForElectron() 44 G4RToEConvForElectron::G4RToEConvForElectron()
43 : G4VRangeToEnergyConverter() << 45 : G4VRangeToEnergyConverter(),
>> 46 Mass(0.0),
>> 47 Z(-1.),
>> 48 taul(0.0),
>> 49 ionpot(0.0),
>> 50 ionpotlog(-1.0e-10),
>> 51 bremfactor(0.1)
44 { 52 {
45 theParticle = G4ParticleTable::GetParticleTa << 53 theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e-");
46 if (theParticle == nullptr ) << 54 if (theParticle ==0) {
47 { <<
48 #ifdef G4VERBOSE 55 #ifdef G4VERBOSE
49 if (GetVerboseLevel()>0) << 56 if (GetVerboseLevel()>0) {
50 { << 57 G4cout << " G4RToEConvForElectron::G4RToEConvForElectron() ";
51 G4cout << "G4RToEConvForElectron::G4RToE << 58 G4cout << " Electron is not defined !!" << G4endl;
52 G4cout << "Electron is not defined !!" < <<
53 } 59 }
54 #endif 60 #endif
55 } << 61 } else {
56 else << 62 Mass = theParticle->GetPDGMass();
57 { <<
58 fPDG = theParticle->GetPDGEncoding(); <<
59 } 63 }
60 } 64 }
61 65
62 // ------------------------------------------- << 66 G4RToEConvForElectron::~G4RToEConvForElectron()
63 G4RToEConvForElectron::~G4RToEConvForElectron( << 67 {
64 {} << 68 }
65 << 69
66 // ------------------------------------------- << 70
67 G4double G4RToEConvForElectron::ComputeValue(c << 71 // **********************************************************************
68 c << 72 // ************************* ComputeLoss ********************************
>> 73 // **********************************************************************
>> 74 G4double G4RToEConvForElectron::ComputeLoss(G4double AtomicNumber,
>> 75 G4double KineticEnergy)
69 { 76 {
70 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3 << 77 const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
71 const G4double Tlow=10.*CLHEP::keV, Thigh=1. << 78 const G4double Tlow=10.*keV, Thigh=1.*GeV;
72 const G4double taul = Tlow/CLHEP::electron_m << 79
73 const G4double log05 = G4Log(0.5); << 80 // calculate dE/dx for electrons
74 const G4double taul12 = std::sqrt(taul); << 81 if( std::fabs(AtomicNumber-Z)>0.1 ) {
75 const G4double bremfactor = 0.1; << 82 Z = AtomicNumber;
76 << 83 taul = Tlow/Mass;
77 const G4double Zlog = G4Pow::GetInstance()-> << 84 ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
78 const G4double ionpot = << 85 ionpotlog = std::log(ionpot);
79 1.6e-5*CLHEP::MeV*G4Exp(0.9*Zlog)/CLHEP::e << 86 }
80 const G4double ionpotlog = G4Log(ionpot); <<
81 87
82 const G4double tau = kinEnergy/CLHEP::electr <<
83 G4double dEdx = 0.0; <<
84 88
85 if(tau<taul) << 89 G4double tau = KineticEnergy/Mass;
86 { << 90 G4double dEdx;
>> 91
>> 92 if(tau<taul) {
87 G4double t1 = taul+1.; 93 G4double t1 = taul+1.;
88 G4double t2 = taul+2.; 94 G4double t2 = taul+2.;
89 G4double tsq = taul*taul; 95 G4double tsq = taul*taul;
90 G4double beta2 = taul*t2/(t1*t1); 96 G4double beta2 = taul*t2/(t1*t1);
91 G4double f = 1.-beta2+G4Log(tsq/2.) << 97 G4double f = 1.-beta2+std::log(tsq/2.)
92 +(0.5+0.25*tsq+(1.+2.*taul)*log << 98 +(0.5+0.25*tsq+(1.+2.*taul)*std::log(0.5))/(t1*t1);
93 dEdx = Z*(G4Log(2.*taul+4.)-2.*ionpotlog+f << 99 dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
94 dEdx *= taul12/std::sqrt(tau); << 100 dEdx = twopi_mc2_rcl2*Z*dEdx;
95 } << 101 G4double clow = dEdx*std::sqrt(taul);
96 else << 102 dEdx = clow/std::sqrt(KineticEnergy/Mass);
97 { << 103
>> 104 } else {
98 G4double t1 = tau+1.; 105 G4double t1 = tau+1.;
99 G4double t2 = tau+2.; 106 G4double t2 = tau+2.;
100 G4double tsq = tau*tau; 107 G4double tsq = tau*tau;
101 G4double beta2 = tau*t2/(t1*t1); 108 G4double beta2 = tau*t2/(t1*t1);
102 G4double f = 1.-beta2+G4Log(tsq/2.) << 109 G4double f = 1.-beta2+std::log(tsq/2.)
103 +(0.5+0.25*tsq+(1.+2.*tau)* << 110 +(0.5+0.25*tsq+(1.+2.*tau)*std::log(0.5))/(t1*t1);
104 dEdx = Z*(G4Log(2.*tau+4.)-2.*ionpotlog+f) << 111 dEdx = (std::log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
>> 112 dEdx = twopi_mc2_rcl2*Z*dEdx;
105 113
106 // loss from bremsstrahlung follows 114 // loss from bremsstrahlung follows
107 G4double cbrem = (cbr1+cbr2*Z)*(cbr3+cbr4* << 115 G4double cbrem = (cbr1+cbr2*Z)
108 dEdx += Z*(Z+1)*cbrem*bremfactor*tau/beta2 << 116 *(cbr3+cbr4*std::log(KineticEnergy/Thigh));
>> 117 cbrem = Z*(Z+1.)*cbrem*tau/beta2;
>> 118
>> 119 cbrem *= bremfactor ;
>> 120
>> 121 dEdx += twopi_mc2_rcl2*cbrem;
109 } 122 }
110 123
111 return dEdx*CLHEP::twopi_mc2_rcl2; << 124 return dEdx;
112 } 125 }
113 <<
114 // ------------------------------------------- <<
115 126