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26 /// \file medical/fanoCavity/src/MyKleinNishin << 26 // $Id: MyKleinNishinaCompton.cc,v 1.6 2009/10/25 19:06:26 maire Exp $
27 /// \brief Implementation of the MyKleinNishin << 27 // GEANT4 tag $Name: geant4-09-03 $
28 // <<
29 // 28 //
30 //....oooOO0OOooo........oooOO0OOooo........oo 29 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
31 //....oooOO0OOooo........oooOO0OOooo........oo 30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
32 31
33 #include "MyKleinNishinaCompton.hh" 32 #include "MyKleinNishinaCompton.hh"
34 <<
35 #include "DetectorConstruction.hh" <<
36 #include "MyKleinNishinaMessenger.hh" 33 #include "MyKleinNishinaMessenger.hh"
>> 34 #include "DetectorConstruction.hh"
37 35
38 #include "G4DataVector.hh" <<
39 #include "G4Electron.hh" 36 #include "G4Electron.hh"
40 #include "G4Gamma.hh" 37 #include "G4Gamma.hh"
41 #include "G4ParticleChangeForGamma.hh" <<
42 #include "G4PhysicalConstants.hh" <<
43 #include "Randomize.hh" 38 #include "Randomize.hh"
>> 39 #include "G4DataVector.hh"
>> 40 #include "G4ParticleChangeForGamma.hh"
44 41
45 //....oooOO0OOooo........oooOO0OOooo........oo 42 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 43
47 using namespace std; 44 using namespace std;
48 45
49 MyKleinNishinaCompton::MyKleinNishinaCompton(D << 46 MyKleinNishinaCompton::MyKleinNishinaCompton(DetectorConstruction* det,
>> 47 const G4ParticleDefinition*,
50 c 48 const G4String& nam)
51 : G4KleinNishinaCompton(0, nam), fDetector(d << 49 :G4KleinNishinaCompton(0,nam), detector(det)
52 { 50 {
53 fCrossSectionFactor = 1.; << 51 CrossSectionFactor = 1.;
54 fMessenger = new MyKleinNishinaMessenger(thi << 52 pMessenger = new MyKleinNishinaMessenger(this);
55 } 53 }
56 54
57 //....oooOO0OOooo........oooOO0OOooo........oo 55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
58 56
59 MyKleinNishinaCompton::~MyKleinNishinaCompton( 57 MyKleinNishinaCompton::~MyKleinNishinaCompton()
60 { << 58 {
61 delete fMessenger; << 59 delete pMessenger;
62 } 60 }
63 61
64 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 63
66 G4double MyKleinNishinaCompton::CrossSectionPe << 64 G4double MyKleinNishinaCompton::CrossSectionPerVolume(
67 << 65 const G4Material* mat,
68 << 66 const G4ParticleDefinition* part,
>> 67 G4double GammaEnergy,
>> 68 G4double, G4double)
69 { 69 {
70 G4double xsection = G4VEmModel::CrossSection << 70 G4double CrossSection =
>> 71 G4VEmModel::CrossSectionPerVolume(mat,part,GammaEnergy);
71 72
72 return xsection * fCrossSectionFactor; << 73 return CrossSection*CrossSectionFactor;
73 } 74 }
74 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
75 76
76 void MyKleinNishinaCompton::SampleSecondaries( << 77 void MyKleinNishinaCompton::SampleSecondaries(
77 << 78 std::vector<G4DynamicParticle*>* fvect,
78 << 79 const G4MaterialCutsCouple*,
79 << 80 const G4DynamicParticle* aDynamicGamma,
>> 81 G4double,
>> 82 G4double)
80 { 83 {
81 // The scattered gamma energy is sampled acc 84 // The scattered gamma energy is sampled according to Klein - Nishina formula.
82 // The random number techniques of Butcher & << 85 // The random number techniques of Butcher & Messel are used
83 // (Nuc Phys 20(1960),15). 86 // (Nuc Phys 20(1960),15).
84 // Note : Effects due to binding of atomic e 87 // Note : Effects due to binding of atomic electrons are negliged.
85 << 88
86 G4double gamEnergy0 = aDynamicGamma->GetKine 89 G4double gamEnergy0 = aDynamicGamma->GetKineticEnergy();
87 G4double E0_m = gamEnergy0 / electron_mass_c << 90 G4double E0_m = gamEnergy0 / electron_mass_c2 ;
88 91
89 G4ThreeVector gamDirection0 = aDynamicGamma- 92 G4ThreeVector gamDirection0 = aDynamicGamma->GetMomentumDirection();
90 93
91 // 94 //
92 // sample the energy rate of the scattered g << 95 // sample the energy rate of the scattered gamma
93 // 96 //
94 97
95 G4double epsilon, epsilonsq, onecost, sint2, << 98 G4double epsilon, epsilonsq, onecost, sint2, greject ;
96 99
97 G4double eps0 = 1. / (1. + 2. * E0_m); << 100 G4double epsilon0 = 1./(1. + 2.*E0_m);
98 G4double eps0sq = eps0 * eps0; << 101 G4double epsilon0sq = epsilon0*epsilon0;
99 G4double alpha1 = -log(eps0); << 102 G4double alpha1 = - log(epsilon0);
100 G4double alpha2 = 0.5 * (1. - eps0sq); << 103 G4double alpha2 = 0.5*(1.- epsilon0sq);
101 104
102 do { 105 do {
103 if (alpha1 / (alpha1 + alpha2) > G4Uniform << 106 if ( alpha1/(alpha1+alpha2) > G4UniformRand() ) {
104 epsilon = exp(-alpha1 * G4UniformRand()) << 107 epsilon = exp(-alpha1*G4UniformRand()); // epsilon0**r
105 epsilonsq = epsilon * epsilon; << 108 epsilonsq = epsilon*epsilon;
106 } << 109
107 else { << 110 } else {
108 epsilonsq = eps0sq + (1. - eps0sq) * G4U << 111 epsilonsq = epsilon0sq + (1.- epsilon0sq)*G4UniformRand();
109 epsilon = sqrt(epsilonsq); << 112 epsilon = sqrt(epsilonsq);
110 }; 113 };
111 114
112 onecost = (1. - epsilon) / (epsilon * E0_m << 115 onecost = (1.- epsilon)/(epsilon*E0_m);
113 sint2 = onecost * (2. - onecost); << 116 sint2 = onecost*(2.-onecost);
114 greject = 1. - epsilon * sint2 / (1. + eps << 117 greject = 1. - epsilon*sint2/(1.+ epsilonsq);
115 118
116 } while (greject < G4UniformRand()); 119 } while (greject < G4UniformRand());
117 << 120
118 // 121 //
119 // scattered gamma angles. ( Z - axis along 122 // scattered gamma angles. ( Z - axis along the parent gamma)
120 // 123 //
121 124
122 G4double cosTeta = 1. - onecost; << 125 G4double cosTeta = 1. - onecost;
123 G4double sinTeta = sqrt(sint2); << 126 G4double sinTeta = sqrt (sint2);
124 G4double Phi = twopi * G4UniformRand(); << 127 G4double Phi = twopi * G4UniformRand();
125 G4double dirx = sinTeta * cos(Phi), diry = s << 128 G4double dirx = sinTeta*cos(Phi), diry = sinTeta*sin(Phi), dirz = cosTeta;
126 129
127 // 130 //
128 // update G4VParticleChange for the scattere 131 // update G4VParticleChange for the scattered gamma
129 // 132 //
130 // beam regeneration trick : restore inciden 133 // beam regeneration trick : restore incident beam
131 << 134
132 G4ThreeVector gamDirection1(dirx, diry, dirz << 135 G4ThreeVector gamDirection1 ( dirx,diry,dirz );
133 gamDirection1.rotateUz(gamDirection0); 136 gamDirection1.rotateUz(gamDirection0);
134 G4double gamEnergy1 = epsilon * gamEnergy0; << 137 G4double gamEnergy1 = epsilon*gamEnergy0;
135 fParticleChange->SetProposedKineticEnergy(ga 138 fParticleChange->SetProposedKineticEnergy(gamEnergy0);
136 fParticleChange->ProposeMomentumDirection(ga 139 fParticleChange->ProposeMomentumDirection(gamDirection0);
137 140
138 // 141 //
139 // kinematic of the scattered electron 142 // kinematic of the scattered electron
140 // 143 //
141 144
142 G4double eKinEnergy = gamEnergy0 - gamEnergy 145 G4double eKinEnergy = gamEnergy0 - gamEnergy1;
143 146
144 if (eKinEnergy > DBL_MIN) { << 147 if(eKinEnergy > DBL_MIN) {
145 G4ThreeVector eDirection = gamEnergy0 * ga << 148 G4ThreeVector eDirection
>> 149 = gamEnergy0*gamDirection0 - gamEnergy1*gamDirection1;
146 eDirection = eDirection.unit(); 150 eDirection = eDirection.unit();
147 151
148 // create G4DynamicParticle object for the 152 // create G4DynamicParticle object for the electron.
149 G4DynamicParticle* dp = new G4DynamicParti << 153 G4DynamicParticle* dp
>> 154 = new G4DynamicParticle(theElectron,eDirection,eKinEnergy);
150 fvect->push_back(dp); 155 fvect->push_back(dp);
151 } 156 }
152 } 157 }
153 158
154 //....oooOO0OOooo........oooOO0OOooo........oo 159 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 160
>> 161
155 162