source: trunk/source/processes/electromagnetic/lowenergy/src/G4FinalStateElasticChampion.cc@ 1197

Last change on this file since 1197 was 1196, checked in by garnier, 16 years ago

update CVS release candidate geant4.9.3.01
File size: 9.6 KB
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1//
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4// * *
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14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
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17// * *
18// * This code implementation is the result of the scientific and *
19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
21// * any work based on the software) you agree to acknowledge its *
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24// ********************************************************************
25//
26// $Id: G4FinalStateElasticChampion.cc,v 1.10 2009/06/11 15:47:08 mantero Exp $
27// GEANT4 tag $Name: geant4-09-03-cand-01 $
28// -------------------------------------------------------------------
29
30
31#include "G4FinalStateElasticChampion.hh"
32
33//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
34
35G4FinalStateElasticChampion::G4FinalStateElasticChampion()
36{
37 G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
38
39 lowEnergyLimit = 8.23* eV; // SI : i/o of 7. * eV;
40 highEnergyLimit = 10. * keV;
41
42 G4double scaleFactor = 1e-16*cm*cm;
43
44 char *path = getenv("G4LEDATA");
45
46 if (!path)
47 G4Exception("G4FinalStateElasticChampion: constructor: G4LEDATA environment variable not set");
48
49 if (electronDef != 0)
50 {
51 std::ostringstream eFullFileName;
52 eFullFileName << path << "/dna/sigmadiff_elastic_e_champion.dat";
53 std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
54
55 if (!eDiffCrossSection) G4Exception("G4FinalStateElasticChampion: constructor: error opening electron DATA FILE");
56
57 eTdummyVec.push_back(0.);
58
59 while(!eDiffCrossSection.eof())
60 {
61 double tDummy;
62 double eDummy;
63 eDiffCrossSection>>tDummy>>eDummy;
64
65 // SI : mandatory eVecm initialization
66 if (tDummy != eTdummyVec.back())
67 {
68 eTdummyVec.push_back(tDummy);
69 eVecm[tDummy].push_back(0.);
70 }
71
72 eDiffCrossSection>>eDiffCrossSectionData[0][tDummy][eDummy];
73
74 // SI : only if not end of file reached !
75 if (!eDiffCrossSection.eof()) eDiffCrossSectionData[0][tDummy][eDummy]*=scaleFactor;
76
77 if (eDummy != eVecm[tDummy].back()) eVecm[tDummy].push_back(eDummy);
78
79 }
80
81 }
82 else
83 {
84 G4Exception("G4FinalStateElastiChampion : constructor: electron is not defined");
85 }
86
87 G4cout << G4endl;
88 G4cout << "*******************************************************************************" << G4endl;
89 G4cout << "*******************************************************************************" << G4endl;
90 G4cout << " The class G4FinalStateElastiChampion is NOT SUPPORTED ANYMORE. " << G4endl;
91 G4cout << " It will be REMOVED with the next major release of Geant4. " << G4endl;
92 G4cout << " Please consult: https://twiki.cern.ch/twiki/bin/view/Geant4/LoweProcesses" << G4endl;
93 G4cout << "*******************************************************************************" << G4endl;
94 G4cout << "*******************************************************************************" << G4endl;
95 G4cout << G4endl;
96}
97
98//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
99
100G4FinalStateElasticChampion::~G4FinalStateElasticChampion()
101{
102 eVecm.clear();
103}
104
105//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
106
107const G4FinalStateProduct& G4FinalStateElasticChampion::GenerateFinalState(const G4Track& track, const G4Step& )
108{
109 product.Clear();
110
111 G4double k = track.GetDynamicParticle()->GetKineticEnergy();
112
113 if (k>= lowEnergyLimit && k < highEnergyLimit)
114 {
115 G4double cosTheta = RandomizeCosTheta(k);
116
117 G4double phi = 2. * pi * G4UniformRand();
118
119 G4ThreeVector zVers = track.GetDynamicParticle()->GetMomentumDirection();
120 G4ThreeVector xVers = zVers.orthogonal();
121 G4ThreeVector yVers = zVers.cross(xVers);
122
123 G4double xDir = std::sqrt(1. - cosTheta*cosTheta);
124 G4double yDir = xDir;
125 xDir *= std::cos(phi);
126 yDir *= std::sin(phi);
127
128 G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers));
129
130 product.ModifyPrimaryParticle(zPrimeVers,k);
131 }
132
133 if (k<lowEnergyLimit)
134 {
135 product.KillPrimaryParticle();
136 }
137
138 return product;
139}
140
141//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
142
143G4double G4FinalStateElasticChampion::DifferentialCrossSection
144 (G4ParticleDefinition * particleDefinition, G4double k, G4double theta)
145{
146 G4double sigma = 0.;
147 G4double valueT1 = 0;
148 G4double valueT2 = 0;
149 G4double valueE21 = 0;
150 G4double valueE22 = 0;
151 G4double valueE12 = 0;
152 G4double valueE11 = 0;
153 G4double xs11 = 0;
154 G4double xs12 = 0;
155 G4double xs21 = 0;
156 G4double xs22 = 0;
157
158 //SI : ensure the correct computation of cross section at the 180*deg limit
159 if (theta==180.) theta=theta-1e-9;
160
161 if (particleDefinition == G4Electron::ElectronDefinition())
162 {
163 std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
164 std::vector<double>::iterator t1 = t2-1;
165
166 std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), theta);
167 std::vector<double>::iterator e11 = e12-1;
168
169 std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), theta);
170 std::vector<double>::iterator e21 = e22-1;
171
172 valueT1 =*t1;
173 valueT2 =*t2;
174 valueE21 =*e21;
175 valueE22 =*e22;
176 valueE12 =*e12;
177 valueE11 =*e11;
178
179 xs11 = eDiffCrossSectionData[0][valueT1][valueE11];
180 xs12 = eDiffCrossSectionData[0][valueT1][valueE12];
181 xs21 = eDiffCrossSectionData[0][valueT2][valueE21];
182 xs22 = eDiffCrossSectionData[0][valueT2][valueE22];
183 }
184
185 G4double xsProduct = xs11 * xs12 * xs21 * xs22;
186
187 if (xs11==0 || xs12==0 ||xs21==0 ||xs22==0) return (0.);
188
189 if (xsProduct != 0.)
190 {
191 sigma = QuadInterpolator( valueE11, valueE12,
192 valueE21, valueE22,
193 xs11, xs12,
194 xs21, xs22,
195 valueT1, valueT2,
196 k, theta );
197 }
198
199 return sigma;
200}
201
202//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
203
204G4double G4FinalStateElasticChampion::LinLogInterpolate(G4double e1,
205 G4double e2,
206 G4double e,
207 G4double xs1,
208 G4double xs2)
209{
210 G4double d1 = std::log(xs1);
211 G4double d2 = std::log(xs2);
212 G4double value = std::exp(d1 + (d2 - d1)*(e - e1)/ (e2 - e1));
213 return value;
214}
215
216//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
217
218G4double G4FinalStateElasticChampion::LogLogInterpolate(G4double e1,
219 G4double e2,
220 G4double e,
221 G4double xs1,
222 G4double xs2)
223{
224 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
225 G4double b = std::log10(xs2) - a*std::log10(e2);
226 G4double sigma = a*std::log10(e) + b;
227 G4double value = (std::pow(10.,sigma));
228 return value;
229}
230
231//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
232
233G4double G4FinalStateElasticChampion::QuadInterpolator(G4double e11, G4double e12,
234 G4double e21, G4double e22,
235 G4double xs11, G4double xs12,
236 G4double xs21, G4double xs22,
237 G4double t1, G4double t2,
238 G4double t, G4double e)
239{
240// Log-Log
241/*
242 G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
243 G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
244 G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
245*/
246
247// Lin-Log
248 G4double interpolatedvalue1 = LinLogInterpolate(e11, e12, e, xs11, xs12);
249 G4double interpolatedvalue2 = LinLogInterpolate(e21, e22, e, xs21, xs22);
250 G4double value = LinLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
251 return value;
252}
253
254//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
255
256G4double G4FinalStateElasticChampion::RandomizeCosTheta(G4double k)
257{
258
259 G4double cosTheta = -1;
260 G4double cumul = 0;
261 G4double value = 0;
262
263 // Number of integration steps in the 0-180 deg range
264 G4int iMax=180;
265
266 G4double random = G4UniformRand();
267
268 // Cumulate differential cross section
269 for (G4int i=0; i<iMax; i++)
270 {
271 cumul = cumul + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1));
272 }
273
274 // Select theta angle
275 for (G4int i=0; i<iMax; i++)
276 {
277 value = value + DifferentialCrossSection(G4Electron::ElectronDefinition(),k/eV,G4double(i)*180./(iMax-1)) / cumul;
278 if (random < value)
279 {
280 cosTheta=std::cos( deg*G4double(i)*180./(iMax-1) );
281 break;
282 }
283 }
284
285 return cosTheta;
286}
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