source: trunk/source/processes/electromagnetic/lowenergy/src/G4LivermoreRayleighModel.cc@ 980

Last change on this file since 980 was 968, checked in by garnier, 17 years ago

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25//
26// $Id: G4LivermoreRayleighModel.cc,v 1.2 2009/01/21 10:58:13 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
28//
29
30#include "G4LivermoreRayleighModel.hh"
31
32//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
33
34using namespace std;
35
36//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
37
38G4LivermoreRayleighModel::G4LivermoreRayleighModel(const G4ParticleDefinition*,
39 const G4String& nam)
40:G4VEmModel(nam),isInitialised(false),meanFreePathTable(0),formFactorData(0),crossSectionHandler(0)
41{
42 lowEnergyLimit = 250 * eV; // SI - Could be 10 eV ?
43 highEnergyLimit = 100 * GeV;
44
45 SetLowEnergyLimit(lowEnergyLimit);
46 SetHighEnergyLimit(highEnergyLimit);
47 //
48 verboseLevel= 0;
49 // Verbosity scale:
50 // 0 = nothing
51 // 1 = warning for energy non-conservation
52 // 2 = details of energy budget
53 // 3 = calculation of cross sections, file openings, sampling of atoms
54 // 4 = entering in methods
55
56 G4cout << "Livermore Rayleigh is constructed " << G4endl
57 << "Energy range: "
58 << lowEnergyLimit / keV << " keV - "
59 << highEnergyLimit / GeV << " GeV"
60 << G4endl;
61}
62
63//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
64
65G4LivermoreRayleighModel::~G4LivermoreRayleighModel()
66{
67 if (meanFreePathTable) delete meanFreePathTable;
68 if (crossSectionHandler) delete crossSectionHandler;
69 if (formFactorData) delete formFactorData;
70}
71
72//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
73
74void G4LivermoreRayleighModel::Initialise(const G4ParticleDefinition* particle,
75 const G4DataVector& cuts)
76{
77 if (verboseLevel > 3)
78 G4cout << "Calling G4LivermoreRayleighModel::Initialise()" << G4endl;
79
80 if (crossSectionHandler)
81 {
82 crossSectionHandler->Clear();
83 delete crossSectionHandler;
84 }
85
86 // Energy limits
87
88 if (LowEnergyLimit() < lowEnergyLimit)
89 {
90 G4cout << "G4LivermoreRayleighModel: low energy limit increased from " <<
91 LowEnergyLimit()/eV << " eV to " << lowEnergyLimit << " eV" << G4endl;
92 SetLowEnergyLimit(lowEnergyLimit);
93 }
94
95 if (HighEnergyLimit() > highEnergyLimit)
96 {
97 G4cout << "G4LivermoreRayleighModel: high energy limit decreased from " <<
98 HighEnergyLimit()/GeV << " GeV to " << highEnergyLimit << " GeV" << G4endl;
99 SetHighEnergyLimit(highEnergyLimit);
100 }
101
102 // Data are read for all materials
103
104 crossSectionHandler = new G4CrossSectionHandler;
105 crossSectionHandler->Clear();
106 G4String crossSectionFile = "rayl/re-cs-";
107 crossSectionHandler->LoadData(crossSectionFile);
108
109 meanFreePathTable = 0;
110 meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials();
111
112 G4VDataSetAlgorithm* ffInterpolation = new G4LogLogInterpolation;
113 G4String formFactorFile = "rayl/re-ff-";
114 formFactorData = new G4CompositeEMDataSet(ffInterpolation,1.,1.);
115 formFactorData->LoadData(formFactorFile);
116
117 //
118
119 if (verboseLevel > 2)
120 G4cout << "Loaded cross section files for Livermore Rayleigh model" << G4endl;
121
122 InitialiseElementSelectors(particle,cuts);
123
124 G4cout << "Livermore Rayleigh model is initialized " << G4endl
125 << "Energy range: "
126 << LowEnergyLimit() / keV << " keV - "
127 << HighEnergyLimit() / GeV << " GeV"
128 << G4endl;
129
130 if(isInitialised) return;
131
132 if(pParticleChange)
133 fParticleChange = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
134 else
135 fParticleChange = new G4ParticleChangeForGamma();
136
137 isInitialised = true;
138
139}
140
141//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
142
143G4double G4LivermoreRayleighModel::ComputeCrossSectionPerAtom(
144 const G4ParticleDefinition*,
145 G4double GammaEnergy,
146 G4double Z, G4double,
147 G4double, G4double)
148{
149 if (verboseLevel > 3)
150 G4cout << "Calling CrossSectionPerAtom() of G4LivermoreRayleighModel" << G4endl;
151
152 G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy);
153 return cs;
154}
155
156//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
157
158void G4LivermoreRayleighModel::SampleSecondaries(std::vector<G4DynamicParticle*>* /*fvect*/,
159 const G4MaterialCutsCouple* couple,
160 const G4DynamicParticle* aDynamicGamma,
161 G4double,
162 G4double)
163{
164 if (verboseLevel > 3)
165 G4cout << "Calling SampleSecondaries() of G4LivermoreRayleighModel" << G4endl;
166
167 G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy();
168
169 if (photonEnergy0 <= lowEnergyLimit)
170 {
171 fParticleChange->ProposeTrackStatus(fStopAndKill);
172 fParticleChange->SetProposedKineticEnergy(0.);
173 fParticleChange->ProposeLocalEnergyDeposit(photonEnergy0);
174 return ;
175 }
176
177 G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection();
178
179 // Select randomly one element in the current material
180 G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy0);
181
182 // Sample the angle of the scattered photon
183
184 G4double wlPhoton = h_Planck*c_light/photonEnergy0;
185
186 G4double gReject,x,dataFormFactor;
187 G4double randomFormFactor;
188 G4double cosTheta;
189 G4double sinTheta;
190 G4double fcostheta;
191
192 do
193 {
194 do
195 {
196 cosTheta = 2. * G4UniformRand() - 1.;
197 fcostheta = ( 1. + cosTheta*cosTheta)/2.;
198 } while (fcostheta < G4UniformRand());
199
200 G4double sinThetaHalf = std::sqrt((1. - cosTheta) / 2.);
201 x = sinThetaHalf / (wlPhoton/cm);
202 if (x > 1.e+005)
203 dataFormFactor = formFactorData->FindValue(x,Z-1);
204 else
205 dataFormFactor = formFactorData->FindValue(0.,Z-1);
206 randomFormFactor = G4UniformRand() * Z * Z;
207 sinTheta = std::sqrt(1. - cosTheta*cosTheta);
208 gReject = dataFormFactor * dataFormFactor;
209
210 } while( gReject < randomFormFactor);
211
212 // Scattered photon angles. ( Z - axis along the parent photon)
213 G4double phi = twopi * G4UniformRand() ;
214 G4double dirX = sinTheta*std::cos(phi);
215 G4double dirY = sinTheta*std::sin(phi);
216 G4double dirZ = cosTheta;
217
218 // Update G4VParticleChange for the scattered photon
219 G4ThreeVector photonDirection1(dirX, dirY, dirZ);
220 photonDirection1.rotateUz(photonDirection0);
221 fParticleChange->ProposeMomentumDirection(photonDirection1);
222
223 fParticleChange->SetProposedKineticEnergy(photonEnergy0);
224}
225
226//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
227
228G4double G4LivermoreRayleighModel::GetMeanFreePath(const G4Track& track,
229 G4double, // previousStepSize
230 G4ForceCondition*)
231{
232 const G4DynamicParticle* photon = track.GetDynamicParticle();
233 G4double energy = photon->GetKineticEnergy();
234 const G4MaterialCutsCouple* couple = track.GetMaterialCutsCouple();
235 size_t materialIndex = couple->GetIndex();
236
237 G4double meanFreePath;
238 if (energy > highEnergyLimit) meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex);
239 else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX;
240 else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex);
241 return meanFreePath;
242}
243
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