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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 // 27 //
28 // Author: Vladimir Grichine 28 // Author: Vladimir Grichine
29 // 29 //
30 // History: 30 // History:
31 // 31 //
32 // 14.10.12 V.Grichine, update of xsc and angu 32 // 14.10.12 V.Grichine, update of xsc and angular distribution
33 // 25.05.2011 first implementation 33 // 25.05.2011 first implementation
34 34
35 #include "G4XrayRayleighModel.hh" 35 #include "G4XrayRayleighModel.hh"
36 #include "G4PhysicalConstants.hh" 36 #include "G4PhysicalConstants.hh"
37 #include "G4SystemOfUnits.hh" 37 #include "G4SystemOfUnits.hh"
38 38
39 ////////////////////////////////////////////// 39 //////////////////////////////////////////////////////////////////////////////////
40 40
41 const G4double G4XrayRayleighModel::fCofA = 2. 41 const G4double G4XrayRayleighModel::fCofA = 2.*pi2*Bohr_radius*Bohr_radius;
42 42
43 const G4double G4XrayRayleighModel::fCofR = 8. 43 const G4double G4XrayRayleighModel::fCofR = 8.*pi*classic_electr_radius*classic_electr_radius/3.;
44 44
45 ////////////////////////////////////////////// 45 //////////////////////////////////////////////////////////////////////////////////
46 46
47 G4XrayRayleighModel::G4XrayRayleighModel(const 47 G4XrayRayleighModel::G4XrayRayleighModel(const G4ParticleDefinition*,
48 const G4String& nam) 48 const G4String& nam)
49 :G4VEmModel(nam),isInitialised(false) 49 :G4VEmModel(nam),isInitialised(false)
50 { 50 {
51 fParticleChange = nullptr; 51 fParticleChange = nullptr;
52 lowEnergyLimit = 250*eV; 52 lowEnergyLimit = 250*eV;
53 highEnergyLimit = 10.*MeV; 53 highEnergyLimit = 10.*MeV;
54 fFormFactor = 0.0; 54 fFormFactor = 0.0;
55 55
56 // SetLowEnergyLimit(lowEnergyLimit); 56 // SetLowEnergyLimit(lowEnergyLimit);
57 SetHighEnergyLimit(highEnergyLimit); 57 SetHighEnergyLimit(highEnergyLimit);
58 // 58 //
59 verboseLevel= 0; 59 verboseLevel= 0;
60 // Verbosity scale: 60 // Verbosity scale:
61 // 0 = nothing 61 // 0 = nothing
62 // 1 = warning for energy non-conservation 62 // 1 = warning for energy non-conservation
63 // 2 = details of energy budget 63 // 2 = details of energy budget
64 // 3 = calculation of cross sections, file o 64 // 3 = calculation of cross sections, file openings, sampling of atoms
65 // 4 = entering in methods 65 // 4 = entering in methods
66 66
67 if(verboseLevel > 0) 67 if(verboseLevel > 0)
68 { 68 {
69 G4cout << "Xray Rayleigh is constructed " 69 G4cout << "Xray Rayleigh is constructed " << G4endl
70 << "Energy range: " 70 << "Energy range: "
71 << lowEnergyLimit / eV << " eV - " 71 << lowEnergyLimit / eV << " eV - "
72 << highEnergyLimit / MeV << " MeV" 72 << highEnergyLimit / MeV << " MeV"
73 << G4endl; 73 << G4endl;
74 } 74 }
75 } 75 }
76 76
77 ////////////////////////////////////////////// 77 //////////////////////////////////////////////////////////////////////////////////
78 78
79 G4XrayRayleighModel::~G4XrayRayleighModel() = 79 G4XrayRayleighModel::~G4XrayRayleighModel() = default;
80 80
81 ////////////////////////////////////////////// 81 //////////////////////////////////////////////////////////////////////////////////
82 82
83 void G4XrayRayleighModel::Initialise(const G4P 83 void G4XrayRayleighModel::Initialise(const G4ParticleDefinition* particle,
84 const G4DataVector& cuts) 84 const G4DataVector& cuts)
85 { 85 {
86 if (verboseLevel > 3) 86 if (verboseLevel > 3)
87 { 87 {
88 G4cout << "Calling G4XrayRayleighModel::In 88 G4cout << "Calling G4XrayRayleighModel::Initialise()" << G4endl;
89 } 89 }
90 90
91 InitialiseElementSelectors(particle,cuts); 91 InitialiseElementSelectors(particle,cuts);
92 92
93 93
94 if(isInitialised) return; 94 if(isInitialised) return;
95 fParticleChange = GetParticleChangeForGamma( 95 fParticleChange = GetParticleChangeForGamma();
96 isInitialised = true; 96 isInitialised = true;
97 97
98 } 98 }
99 99
100 ////////////////////////////////////////////// 100 //////////////////////////////////////////////////////////////////////////////////
101 101
102 G4double G4XrayRayleighModel::ComputeCrossSect 102 G4double G4XrayRayleighModel::ComputeCrossSectionPerAtom(
103 const G 103 const G4ParticleDefinition*,
104 G 104 G4double gammaEnergy,
105 G 105 G4double Z, G4double,
106 G 106 G4double, G4double)
107 { 107 {
108 if (verboseLevel > 3) 108 if (verboseLevel > 3)
109 { 109 {
110 G4cout << "Calling CrossSectionPerAtom() o 110 G4cout << "Calling CrossSectionPerAtom() of G4XrayRayleighModel" << G4endl;
111 } 111 }
112 if (gammaEnergy < lowEnergyLimit || gammaEne 112 if (gammaEnergy < lowEnergyLimit || gammaEnergy > highEnergyLimit)
113 { 113 {
114 return 0.0; 114 return 0.0;
115 } 115 }
116 G4double k = gammaEnergy/hbarc; 116 G4double k = gammaEnergy/hbarc;
117 k *= Bohr_radius; 117 k *= Bohr_radius;
118 G4double p0 = 0.680654; 118 G4double p0 = 0.680654;
119 G4double p1 = -0.0224188; 119 G4double p1 = -0.0224188;
120 G4double lnZ = std::log(Z); 120 G4double lnZ = std::log(Z);
121 121
122 G4double lna = p0 + p1*lnZ; 122 G4double lna = p0 + p1*lnZ;
123 123
124 G4double alpha = std::exp(lna); 124 G4double alpha = std::exp(lna);
125 125
126 G4double fo = std::pow(k, alpha); 126 G4double fo = std::pow(k, alpha);
127 127
128 p0 = 3.68455; 128 p0 = 3.68455;
129 p1 = -0.464806; 129 p1 = -0.464806;
130 lna = p0 + p1*lnZ; 130 lna = p0 + p1*lnZ;
131 131
132 fo *= 0.01*std::exp(lna); 132 fo *= 0.01*std::exp(lna);
133 133
134 fFormFactor = fo; 134 fFormFactor = fo;
135 135
136 G4double b = 1. + 2.*fo; 136 G4double b = 1. + 2.*fo;
137 G4double b2 = b*b; 137 G4double b2 = b*b;
138 G4double b3 = b*b2; 138 G4double b3 = b*b2;
139 139
140 G4double xsc = fCofR*Z*Z/b3; 140 G4double xsc = fCofR*Z*Z/b3;
141 xsc *= fo*fo + (1. + fo)*(1. + fo); 141 xsc *= fo*fo + (1. + fo)*(1. + fo);
142 142
143 143
144 return xsc; 144 return xsc;
145 145
146 } 146 }
147 147
148 ////////////////////////////////////////////// 148 //////////////////////////////////////////////////////////////////////////////////
149 149
150 void G4XrayRayleighModel::SampleSecondaries(st 150 void G4XrayRayleighModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
151 co 151 const G4MaterialCutsCouple* couple,
152 co 152 const G4DynamicParticle* aDPGamma,
153 G4 153 G4double,
154 G4 154 G4double)
155 { 155 {
156 if ( verboseLevel > 3) 156 if ( verboseLevel > 3)
157 { 157 {
158 G4cout << "Calling SampleSecondaries() of 158 G4cout << "Calling SampleSecondaries() of G4XrayRayleighModel" << G4endl;
159 } 159 }
160 G4double photonEnergy0 = aDPGamma->GetKineti 160 G4double photonEnergy0 = aDPGamma->GetKineticEnergy();
161 161
162 G4ParticleMomentum photonDirection0 = aDPGam 162 G4ParticleMomentum photonDirection0 = aDPGamma->GetMomentumDirection();
163 163
164 164
165 // Sample the angle of the scattered photon 165 // Sample the angle of the scattered photon
166 // according to 1 + cosTheta*cosTheta distri 166 // according to 1 + cosTheta*cosTheta distribution
167 167
168 G4double cosDipole, cosTheta, sinTheta; 168 G4double cosDipole, cosTheta, sinTheta;
169 G4double c, delta, cofA, signc = 1., a, powe 169 G4double c, delta, cofA, signc = 1., a, power = 1./3.;
170 170
171 c = 4. - 8.*G4UniformRand(); 171 c = 4. - 8.*G4UniformRand();
172 a = c; 172 a = c;
173 173
174 if( c < 0. ) 174 if( c < 0. )
175 { 175 {
176 signc = -1.; 176 signc = -1.;
177 a = -c; 177 a = -c;
178 } 178 }
179 delta = std::sqrt(a*a+4.); 179 delta = std::sqrt(a*a+4.);
180 delta += a; 180 delta += a;
181 delta *= 0.5; 181 delta *= 0.5;
182 cofA = -signc*std::pow(delta, power); 182 cofA = -signc*std::pow(delta, power);
183 cosDipole = cofA - 1./cofA; 183 cosDipole = cofA - 1./cofA;
184 184
185 // select atom 185 // select atom
186 const G4Element* elm = SelectTargetAtom(coup 186 const G4Element* elm = SelectTargetAtom(couple, aDPGamma->GetParticleDefinition(),
187 phot 187 photonEnergy0,aDPGamma->GetLogKineticEnergy());
188 G4double Z = elm->GetZ(); 188 G4double Z = elm->GetZ();
189 189
190 G4double k = photonEnergy0/hbarc; 190 G4double k = photonEnergy0/hbarc;
191 k *= Bohr_radius; 191 k *= Bohr_radius;
192 G4double p0 = 0.680654; 192 G4double p0 = 0.680654;
193 G4double p1 = -0.0224188; 193 G4double p1 = -0.0224188;
194 G4double lnZ = std::log(Z); 194 G4double lnZ = std::log(Z);
195 195
196 G4double lna = p0 + p1*lnZ; 196 G4double lna = p0 + p1*lnZ;
197 197
198 G4double alpha = std::exp(lna); 198 G4double alpha = std::exp(lna);
199 199
200 G4double fo = std::pow(k, alpha); 200 G4double fo = std::pow(k, alpha);
201 201
202 p0 = 3.68455; 202 p0 = 3.68455;
203 p1 = -0.464806; 203 p1 = -0.464806;
204 lna = p0 + p1*lnZ; 204 lna = p0 + p1*lnZ;
205 205
206 fo *= 0.01*pi*std::exp(lna); 206 fo *= 0.01*pi*std::exp(lna);
207 207
208 208
209 G4double beta = fo/(1 + fo); 209 G4double beta = fo/(1 + fo);
210 210
211 cosTheta = (cosDipole + beta)/(1. + cosDipol 211 cosTheta = (cosDipole + beta)/(1. + cosDipole*beta);
212 212
213 213
214 if( cosTheta > 1.) cosTheta = 1.; 214 if( cosTheta > 1.) cosTheta = 1.;
215 if( cosTheta < -1.) cosTheta = -1.; 215 if( cosTheta < -1.) cosTheta = -1.;
216 216
217 sinTheta = std::sqrt( (1. - cosTheta)*(1. + 217 sinTheta = std::sqrt( (1. - cosTheta)*(1. + cosTheta) );
218 218
219 // Scattered photon angles. ( Z - axis along 219 // Scattered photon angles. ( Z - axis along the parent photon)
220 220
221 G4double phi = twopi * G4UniformRand() ; 221 G4double phi = twopi * G4UniformRand() ;
222 G4double dirX = sinTheta*std::cos(phi); 222 G4double dirX = sinTheta*std::cos(phi);
223 G4double dirY = sinTheta*std::sin(phi); 223 G4double dirY = sinTheta*std::sin(phi);
224 G4double dirZ = cosTheta; 224 G4double dirZ = cosTheta;
225 225
226 // Update G4VParticleChange for the scattere 226 // Update G4VParticleChange for the scattered photon
227 227
228 G4ThreeVector photonDirection1(dirX, dirY, d 228 G4ThreeVector photonDirection1(dirX, dirY, dirZ);
229 photonDirection1.rotateUz(photonDirection0); 229 photonDirection1.rotateUz(photonDirection0);
230 fParticleChange->ProposeMomentumDirection(ph 230 fParticleChange->ProposeMomentumDirection(photonDirection1);
231 231
232 fParticleChange->SetProposedKineticEnergy(ph 232 fParticleChange->SetProposedKineticEnergy(photonEnergy0);
233 } 233 }
234 234
235 235
236 236