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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
>> 41 using namespace std;
40 42
41 const G4double G4XrayRayleighModel::fCofA = 2. 43 const G4double G4XrayRayleighModel::fCofA = 2.*pi2*Bohr_radius*Bohr_radius;
42 44
43 const G4double G4XrayRayleighModel::fCofR = 8. 45 const G4double G4XrayRayleighModel::fCofR = 8.*pi*classic_electr_radius*classic_electr_radius/3.;
44 46
45 ////////////////////////////////////////////// << 47 //////////////////////////////////////////////////////////////////////////////////.
46 48
47 G4XrayRayleighModel::G4XrayRayleighModel(const 49 G4XrayRayleighModel::G4XrayRayleighModel(const G4ParticleDefinition*,
48 const G4String& nam) 50 const G4String& nam)
49 :G4VEmModel(nam),isInitialised(false) 51 :G4VEmModel(nam),isInitialised(false)
50 { 52 {
51 fParticleChange = nullptr; << 53 fParticleChange = 0;
52 lowEnergyLimit = 250*eV; 54 lowEnergyLimit = 250*eV;
53 highEnergyLimit = 10.*MeV; 55 highEnergyLimit = 10.*MeV;
54 fFormFactor = 0.0; 56 fFormFactor = 0.0;
55 57
56 // SetLowEnergyLimit(lowEnergyLimit); 58 // SetLowEnergyLimit(lowEnergyLimit);
57 SetHighEnergyLimit(highEnergyLimit); 59 SetHighEnergyLimit(highEnergyLimit);
58 // 60 //
59 verboseLevel= 0; 61 verboseLevel= 0;
60 // Verbosity scale: 62 // Verbosity scale:
61 // 0 = nothing 63 // 0 = nothing
62 // 1 = warning for energy non-conservation 64 // 1 = warning for energy non-conservation
63 // 2 = details of energy budget 65 // 2 = details of energy budget
64 // 3 = calculation of cross sections, file o 66 // 3 = calculation of cross sections, file openings, sampling of atoms
65 // 4 = entering in methods 67 // 4 = entering in methods
66 68
67 if(verboseLevel > 0) 69 if(verboseLevel > 0)
68 { 70 {
69 G4cout << "Xray Rayleigh is constructed " 71 G4cout << "Xray Rayleigh is constructed " << G4endl
70 << "Energy range: " 72 << "Energy range: "
71 << lowEnergyLimit / eV << " eV - " 73 << lowEnergyLimit / eV << " eV - "
72 << highEnergyLimit / MeV << " MeV" 74 << highEnergyLimit / MeV << " MeV"
73 << G4endl; 75 << G4endl;
74 } 76 }
75 } 77 }
76 78
77 ////////////////////////////////////////////// 79 //////////////////////////////////////////////////////////////////////////////////
78 80
79 G4XrayRayleighModel::~G4XrayRayleighModel() = << 81 G4XrayRayleighModel::~G4XrayRayleighModel()
>> 82 {
80 83
81 ////////////////////////////////////////////// << 84 }
>> 85
>> 86 /////////////////////////////////////////////////////////////////////////////////////
82 87
83 void G4XrayRayleighModel::Initialise(const G4P 88 void G4XrayRayleighModel::Initialise(const G4ParticleDefinition* particle,
84 const G4DataVector& cuts) 89 const G4DataVector& cuts)
85 { 90 {
86 if (verboseLevel > 3) 91 if (verboseLevel > 3)
87 { 92 {
88 G4cout << "Calling G4XrayRayleighModel::In 93 G4cout << "Calling G4XrayRayleighModel::Initialise()" << G4endl;
89 } 94 }
90 95
91 InitialiseElementSelectors(particle,cuts); 96 InitialiseElementSelectors(particle,cuts);
92 97
93 98
94 if(isInitialised) return; 99 if(isInitialised) return;
95 fParticleChange = GetParticleChangeForGamma( 100 fParticleChange = GetParticleChangeForGamma();
96 isInitialised = true; 101 isInitialised = true;
97 102
98 } 103 }
99 104
100 ////////////////////////////////////////////// << 105 /////////////////////////////////////////////////////////////////////////////////
101 106
102 G4double G4XrayRayleighModel::ComputeCrossSect 107 G4double G4XrayRayleighModel::ComputeCrossSectionPerAtom(
103 const G 108 const G4ParticleDefinition*,
104 G 109 G4double gammaEnergy,
105 G 110 G4double Z, G4double,
106 G 111 G4double, G4double)
107 { 112 {
108 if (verboseLevel > 3) 113 if (verboseLevel > 3)
109 { 114 {
110 G4cout << "Calling CrossSectionPerAtom() o 115 G4cout << "Calling CrossSectionPerAtom() of G4XrayRayleighModel" << G4endl;
111 } 116 }
112 if (gammaEnergy < lowEnergyLimit || gammaEne 117 if (gammaEnergy < lowEnergyLimit || gammaEnergy > highEnergyLimit)
113 { 118 {
114 return 0.0; 119 return 0.0;
115 } 120 }
116 G4double k = gammaEnergy/hbarc; 121 G4double k = gammaEnergy/hbarc;
117 k *= Bohr_radius; 122 k *= Bohr_radius;
118 G4double p0 = 0.680654; 123 G4double p0 = 0.680654;
119 G4double p1 = -0.0224188; 124 G4double p1 = -0.0224188;
120 G4double lnZ = std::log(Z); 125 G4double lnZ = std::log(Z);
121 126
122 G4double lna = p0 + p1*lnZ; 127 G4double lna = p0 + p1*lnZ;
123 128
124 G4double alpha = std::exp(lna); 129 G4double alpha = std::exp(lna);
125 130
126 G4double fo = std::pow(k, alpha); 131 G4double fo = std::pow(k, alpha);
127 132
128 p0 = 3.68455; 133 p0 = 3.68455;
129 p1 = -0.464806; 134 p1 = -0.464806;
130 lna = p0 + p1*lnZ; 135 lna = p0 + p1*lnZ;
131 136
132 fo *= 0.01*std::exp(lna); 137 fo *= 0.01*std::exp(lna);
133 138
134 fFormFactor = fo; 139 fFormFactor = fo;
135 140
136 G4double b = 1. + 2.*fo; 141 G4double b = 1. + 2.*fo;
137 G4double b2 = b*b; 142 G4double b2 = b*b;
138 G4double b3 = b*b2; 143 G4double b3 = b*b2;
139 144
140 G4double xsc = fCofR*Z*Z/b3; 145 G4double xsc = fCofR*Z*Z/b3;
141 xsc *= fo*fo + (1. + fo)*(1. + fo); 146 xsc *= fo*fo + (1. + fo)*(1. + fo);
142 147
143 148
144 return xsc; 149 return xsc;
145 150
146 } 151 }
147 152
148 ////////////////////////////////////////////// << 153 ///////////////////////////////////////////////////////////////////////////////////
149 154
150 void G4XrayRayleighModel::SampleSecondaries(st << 155 void G4XrayRayleighModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
151 co << 156 const G4MaterialCutsCouple* couple,
152 co << 157 const G4DynamicParticle* aDynamicGamma,
153 G4 << 158 G4double,
154 G4 << 159 G4double)
155 { 160 {
156 if ( verboseLevel > 3) 161 if ( verboseLevel > 3)
157 { 162 {
158 G4cout << "Calling SampleSecondaries() of 163 G4cout << "Calling SampleSecondaries() of G4XrayRayleighModel" << G4endl;
159 } 164 }
160 G4double photonEnergy0 = aDPGamma->GetKineti << 165 G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy();
161 166
162 G4ParticleMomentum photonDirection0 = aDPGam << 167 G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection();
163 168
164 169
165 // Sample the angle of the scattered photon 170 // Sample the angle of the scattered photon
166 // according to 1 + cosTheta*cosTheta distri 171 // according to 1 + cosTheta*cosTheta distribution
167 172
168 G4double cosDipole, cosTheta, sinTheta; 173 G4double cosDipole, cosTheta, sinTheta;
169 G4double c, delta, cofA, signc = 1., a, powe 174 G4double c, delta, cofA, signc = 1., a, power = 1./3.;
170 175
171 c = 4. - 8.*G4UniformRand(); 176 c = 4. - 8.*G4UniformRand();
172 a = c; 177 a = c;
173 178
174 if( c < 0. ) 179 if( c < 0. )
175 { 180 {
176 signc = -1.; 181 signc = -1.;
177 a = -c; 182 a = -c;
178 } 183 }
179 delta = std::sqrt(a*a+4.); 184 delta = std::sqrt(a*a+4.);
180 delta += a; 185 delta += a;
181 delta *= 0.5; 186 delta *= 0.5;
182 cofA = -signc*std::pow(delta, power); 187 cofA = -signc*std::pow(delta, power);
183 cosDipole = cofA - 1./cofA; 188 cosDipole = cofA - 1./cofA;
184 189
185 // select atom 190 // select atom
186 const G4Element* elm = SelectTargetAtom(coup << 191 const G4Element* elm = SelectRandomAtom(couple, aDynamicGamma->GetParticleDefinition(), photonEnergy0);
187 phot <<
188 G4double Z = elm->GetZ(); 192 G4double Z = elm->GetZ();
189 193
190 G4double k = photonEnergy0/hbarc; 194 G4double k = photonEnergy0/hbarc;
191 k *= Bohr_radius; 195 k *= Bohr_radius;
192 G4double p0 = 0.680654; 196 G4double p0 = 0.680654;
193 G4double p1 = -0.0224188; 197 G4double p1 = -0.0224188;
194 G4double lnZ = std::log(Z); 198 G4double lnZ = std::log(Z);
195 199
196 G4double lna = p0 + p1*lnZ; 200 G4double lna = p0 + p1*lnZ;
197 201
198 G4double alpha = std::exp(lna); 202 G4double alpha = std::exp(lna);
199 203
200 G4double fo = std::pow(k, alpha); 204 G4double fo = std::pow(k, alpha);
201 205
202 p0 = 3.68455; 206 p0 = 3.68455;
203 p1 = -0.464806; 207 p1 = -0.464806;
204 lna = p0 + p1*lnZ; 208 lna = p0 + p1*lnZ;
205 209
206 fo *= 0.01*pi*std::exp(lna); 210 fo *= 0.01*pi*std::exp(lna);
207 211
208 212
209 G4double beta = fo/(1 + fo); 213 G4double beta = fo/(1 + fo);
210 214
211 cosTheta = (cosDipole + beta)/(1. + cosDipol 215 cosTheta = (cosDipole + beta)/(1. + cosDipole*beta);
212 216
213 217
214 if( cosTheta > 1.) cosTheta = 1.; 218 if( cosTheta > 1.) cosTheta = 1.;
215 if( cosTheta < -1.) cosTheta = -1.; 219 if( cosTheta < -1.) cosTheta = -1.;
216 220
217 sinTheta = std::sqrt( (1. - cosTheta)*(1. + 221 sinTheta = std::sqrt( (1. - cosTheta)*(1. + cosTheta) );
218 222
219 // Scattered photon angles. ( Z - axis along 223 // Scattered photon angles. ( Z - axis along the parent photon)
220 224
221 G4double phi = twopi * G4UniformRand() ; 225 G4double phi = twopi * G4UniformRand() ;
222 G4double dirX = sinTheta*std::cos(phi); 226 G4double dirX = sinTheta*std::cos(phi);
223 G4double dirY = sinTheta*std::sin(phi); 227 G4double dirY = sinTheta*std::sin(phi);
224 G4double dirZ = cosTheta; 228 G4double dirZ = cosTheta;
225 229
226 // Update G4VParticleChange for the scattere 230 // Update G4VParticleChange for the scattered photon
227 231
228 G4ThreeVector photonDirection1(dirX, dirY, d 232 G4ThreeVector photonDirection1(dirX, dirY, dirZ);
229 photonDirection1.rotateUz(photonDirection0); 233 photonDirection1.rotateUz(photonDirection0);
230 fParticleChange->ProposeMomentumDirection(ph 234 fParticleChange->ProposeMomentumDirection(photonDirection1);
231 235
232 fParticleChange->SetProposedKineticEnergy(ph 236 fParticleChange->SetProposedKineticEnergy(photonEnergy0);
233 } 237 }
234 238
235 239
236 240