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25 // 25 //
26 /// \file medical/fanoCavity/src/MyKleinNishin 26 /// \file medical/fanoCavity/src/MyKleinNishinaCompton.cc
27 /// \brief Implementation of the MyKleinNishin 27 /// \brief Implementation of the MyKleinNishinaCompton class
28 // 28 //
29 // 29 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
31 //....oooOO0OOooo........oooOO0OOooo........oo 31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
32 32
33 #include "MyKleinNishinaCompton.hh" 33 #include "MyKleinNishinaCompton.hh"
34 <<
35 #include "DetectorConstruction.hh" <<
36 #include "MyKleinNishinaMessenger.hh" 34 #include "MyKleinNishinaMessenger.hh"
>> 35 #include "DetectorConstruction.hh"
37 36
38 #include "G4DataVector.hh" <<
39 #include "G4Electron.hh" 37 #include "G4Electron.hh"
40 #include "G4Gamma.hh" 38 #include "G4Gamma.hh"
>> 39 #include "Randomize.hh"
>> 40 #include "G4DataVector.hh"
41 #include "G4ParticleChangeForGamma.hh" 41 #include "G4ParticleChangeForGamma.hh"
42 #include "G4PhysicalConstants.hh" 42 #include "G4PhysicalConstants.hh"
43 #include "Randomize.hh" <<
44 43
45 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 45
47 using namespace std; 46 using namespace std;
48 47
49 MyKleinNishinaCompton::MyKleinNishinaCompton(D << 48 MyKleinNishinaCompton::MyKleinNishinaCompton(DetectorConstruction* det,
>> 49 const G4ParticleDefinition*,
50 c 50 const G4String& nam)
51 : G4KleinNishinaCompton(0, nam), fDetector(d << 51 :G4KleinNishinaCompton(0,nam), fDetector(det), fMessenger(0)
52 { 52 {
53 fCrossSectionFactor = 1.; 53 fCrossSectionFactor = 1.;
54 fMessenger = new MyKleinNishinaMessenger(thi << 54 fMessenger = new MyKleinNishinaMessenger(this);
55 } 55 }
56 56
57 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
58 58
59 MyKleinNishinaCompton::~MyKleinNishinaCompton( 59 MyKleinNishinaCompton::~MyKleinNishinaCompton()
60 { << 60 {
61 delete fMessenger; << 61 delete fMessenger;
62 } 62 }
63 63
64 //....oooOO0OOooo........oooOO0OOooo........oo 64 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 65
66 G4double MyKleinNishinaCompton::CrossSectionPe << 66 G4double MyKleinNishinaCompton::CrossSectionPerVolume(
67 << 67 const G4Material* mat,
68 << 68 const G4ParticleDefinition* part,
>> 69 G4double GammaEnergy,
>> 70 G4double, G4double)
69 { 71 {
70 G4double xsection = G4VEmModel::CrossSection << 72 G4double xsection = G4VEmModel::CrossSectionPerVolume(mat,part,GammaEnergy);
71 73
72 return xsection * fCrossSectionFactor; << 74 return xsection*fCrossSectionFactor;
73 } 75 }
74 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75 77
76 void MyKleinNishinaCompton::SampleSecondaries( << 78 void MyKleinNishinaCompton::SampleSecondaries(
77 << 79 std::vector<G4DynamicParticle*>* fvect,
78 << 80 const G4MaterialCutsCouple*,
79 << 81 const G4DynamicParticle* aDynamicGamma,
>> 82 G4double,
>> 83 G4double)
80 { 84 {
81 // The scattered gamma energy is sampled acc 85 // The scattered gamma energy is sampled according to Klein - Nishina formula.
82 // The random number techniques of Butcher & << 86 // The random number techniques of Butcher & Messel are used
83 // (Nuc Phys 20(1960),15). 87 // (Nuc Phys 20(1960),15).
84 // Note : Effects due to binding of atomic e 88 // Note : Effects due to binding of atomic electrons are negliged.
85 << 89
86 G4double gamEnergy0 = aDynamicGamma->GetKine 90 G4double gamEnergy0 = aDynamicGamma->GetKineticEnergy();
87 G4double E0_m = gamEnergy0 / electron_mass_c << 91 G4double E0_m = gamEnergy0 / electron_mass_c2 ;
88 92
89 G4ThreeVector gamDirection0 = aDynamicGamma- 93 G4ThreeVector gamDirection0 = aDynamicGamma->GetMomentumDirection();
90 94
91 // 95 //
92 // sample the energy rate of the scattered g << 96 // sample the energy rate of the scattered gamma
93 // 97 //
94 98
95 G4double epsilon, epsilonsq, onecost, sint2, << 99 G4double epsilon, epsilonsq, onecost, sint2, greject ;
96 100
97 G4double eps0 = 1. / (1. + 2. * E0_m); << 101 G4double eps0 = 1./(1. + 2.*E0_m);
98 G4double eps0sq = eps0 * eps0; << 102 G4double eps0sq = eps0*eps0;
99 G4double alpha1 = -log(eps0); << 103 G4double alpha1 = - log(eps0);
100 G4double alpha2 = 0.5 * (1. - eps0sq); << 104 G4double alpha2 = 0.5*(1.- eps0sq);
101 105
102 do { 106 do {
103 if (alpha1 / (alpha1 + alpha2) > G4Uniform << 107 if ( alpha1/(alpha1+alpha2) > G4UniformRand() ) {
104 epsilon = exp(-alpha1 * G4UniformRand()) << 108 epsilon = exp(-alpha1*G4UniformRand()); // eps0**r
105 epsilonsq = epsilon * epsilon; << 109 epsilonsq = epsilon*epsilon;
106 } << 110
107 else { << 111 } else {
108 epsilonsq = eps0sq + (1. - eps0sq) * G4U << 112 epsilonsq = eps0sq + (1.- eps0sq)*G4UniformRand();
109 epsilon = sqrt(epsilonsq); << 113 epsilon = sqrt(epsilonsq);
110 }; 114 };
111 115
112 onecost = (1. - epsilon) / (epsilon * E0_m << 116 onecost = (1.- epsilon)/(epsilon*E0_m);
113 sint2 = onecost * (2. - onecost); << 117 sint2 = onecost*(2.-onecost);
114 greject = 1. - epsilon * sint2 / (1. + eps << 118 greject = 1. - epsilon*sint2/(1.+ epsilonsq);
115 119
116 } while (greject < G4UniformRand()); 120 } while (greject < G4UniformRand());
117 << 121
118 // 122 //
119 // scattered gamma angles. ( Z - axis along 123 // scattered gamma angles. ( Z - axis along the parent gamma)
120 // 124 //
121 125
122 G4double cosTeta = 1. - onecost; << 126 G4double cosTeta = 1. - onecost;
123 G4double sinTeta = sqrt(sint2); << 127 G4double sinTeta = sqrt (sint2);
124 G4double Phi = twopi * G4UniformRand(); << 128 G4double Phi = twopi * G4UniformRand();
125 G4double dirx = sinTeta * cos(Phi), diry = s << 129 G4double dirx = sinTeta*cos(Phi), diry = sinTeta*sin(Phi), dirz = cosTeta;
126 130
127 // 131 //
128 // update G4VParticleChange for the scattere 132 // update G4VParticleChange for the scattered gamma
129 // 133 //
130 // beam regeneration trick : restore inciden 134 // beam regeneration trick : restore incident beam
131 << 135
132 G4ThreeVector gamDirection1(dirx, diry, dirz << 136 G4ThreeVector gamDirection1 ( dirx,diry,dirz );
133 gamDirection1.rotateUz(gamDirection0); 137 gamDirection1.rotateUz(gamDirection0);
134 G4double gamEnergy1 = epsilon * gamEnergy0; << 138 G4double gamEnergy1 = epsilon*gamEnergy0;
135 fParticleChange->SetProposedKineticEnergy(ga 139 fParticleChange->SetProposedKineticEnergy(gamEnergy0);
136 fParticleChange->ProposeMomentumDirection(ga 140 fParticleChange->ProposeMomentumDirection(gamDirection0);
137 141
138 // 142 //
139 // kinematic of the scattered electron 143 // kinematic of the scattered electron
140 // 144 //
141 145
142 G4double eKinEnergy = gamEnergy0 - gamEnergy 146 G4double eKinEnergy = gamEnergy0 - gamEnergy1;
143 147
144 if (eKinEnergy > DBL_MIN) { << 148 if(eKinEnergy > DBL_MIN) {
145 G4ThreeVector eDirection = gamEnergy0 * ga << 149 G4ThreeVector eDirection
>> 150 = gamEnergy0*gamDirection0 - gamEnergy1*gamDirection1;
146 eDirection = eDirection.unit(); 151 eDirection = eDirection.unit();
147 152
148 // create G4DynamicParticle object for the 153 // create G4DynamicParticle object for the electron.
149 G4DynamicParticle* dp = new G4DynamicParti << 154 G4DynamicParticle* dp
>> 155 = new G4DynamicParticle(theElectron,eDirection,eKinEnergy);
150 fvect->push_back(dp); 156 fvect->push_back(dp);
151 } 157 }
152 } 158 }
153 159
154 //....oooOO0OOooo........oooOO0OOooo........oo 160 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 161
155 162