source: trunk/source/processes/electromagnetic/lowenergy/src/G4FinalStateIonisationBorn.cc@ 968

Last change on this file since 968 was 961, checked in by garnier, 17 years ago

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26// $Id: G4FinalStateIonisationBorn.cc,v 1.16 2008/12/06 13:47:12 sincerti Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
28
29#include "G4FinalStateIonisationBorn.hh"
30
31//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32
33G4FinalStateIonisationBorn::G4FinalStateIonisationBorn()
34{
35 G4double scaleFactor = (1.e-22 / 3.343) * m*m;
36
37 G4ParticleDefinition* electronDef = G4Electron::ElectronDefinition();
38 G4ParticleDefinition* protonDef = G4Proton::ProtonDefinition();
39
40 G4String electron;
41 G4String proton;
42
43 lowEnergyLimitDefault = 12.61 * eV; // SI: i/o 25 eV
44 highEnergyLimitDefault = 10 * MeV;
45
46 char *path = getenv("G4LEDATA");
47
48 if (!path)
49 G4Exception("G4DNACrossSectionDataSet::FullFileName - G4LEDATA environment variable not set");
50
51 if (electronDef != 0)
52 {
53 electron = electronDef->GetParticleName();
54 lowEnergyLimit[electron] = 12.61 * eV; // SI: i/o 25 eV
55 highEnergyLimit[electron] = 30. * keV;
56
57 std::ostringstream eFullFileName;
58 eFullFileName << path << "/dna/sigmadiff_ionisation_e_born.dat";
59 std::ifstream eDiffCrossSection(eFullFileName.str().c_str());
60 if (!eDiffCrossSection)
61 {
62 G4Exception("G4FinalStateIonisationBorn::ERROR OPENING electron DATA FILE");
63 }
64
65 eTdummyVec.push_back(0.);
66 while(!eDiffCrossSection.eof())
67 {
68 double tDummy;
69 double eDummy;
70 eDiffCrossSection>>tDummy>>eDummy;
71 if (tDummy != eTdummyVec.back()) eTdummyVec.push_back(tDummy);
72 for (int j=0; j<5; j++)
73 {
74 eDiffCrossSection>>eDiffCrossSectionData[j][tDummy][eDummy];
75
76 // SI - only if eof is not reached !
77 if (!eDiffCrossSection.eof()) eDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
78
79 eVecm[tDummy].push_back(eDummy);
80
81 }
82 }
83
84 }
85 else
86 {
87 G4Exception("G4FinalStateIonisationBorn Constructor: electron is not defined");
88 }
89
90 if (protonDef != 0)
91 {
92 proton = protonDef->GetParticleName();
93 lowEnergyLimit[proton] = 500. * keV;
94 highEnergyLimit[proton] = 10. * MeV;
95
96 std::ostringstream pFullFileName;
97 pFullFileName << path << "/dna/sigmadiff_ionisation_p_born.dat";
98 std::ifstream pDiffCrossSection(pFullFileName.str().c_str());
99 if (!pDiffCrossSection)
100 {
101 G4Exception("G4FinalStateIonisationBorn::ERROR OPENING proton DATA FILE");
102 }
103
104 pTdummyVec.push_back(0.);
105 while(!pDiffCrossSection.eof())
106 {
107 double tDummy;
108 double eDummy;
109 pDiffCrossSection>>tDummy>>eDummy;
110 if (tDummy != pTdummyVec.back()) pTdummyVec.push_back(tDummy);
111 for (int j=0; j<5; j++)
112 {
113 pDiffCrossSection>>pDiffCrossSectionData[j][tDummy][eDummy];
114
115 // SI - only if eof is not reached !
116 if (!pDiffCrossSection.eof()) pDiffCrossSectionData[j][tDummy][eDummy]*=scaleFactor;
117
118 pVecm[tDummy].push_back(eDummy);
119 }
120 }
121 }
122 else
123 {
124 G4Exception("G4FinalStateIonisationBorn Constructor: proton is not defined");
125 }
126}
127
128//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
129
130G4FinalStateIonisationBorn::~G4FinalStateIonisationBorn()
131{
132 eVecm.clear();
133 pVecm.clear();
134}
135
136//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
137
138const G4FinalStateProduct& G4FinalStateIonisationBorn::GenerateFinalState(const G4Track& track, const G4Step& /* step */)
139{
140 product.Clear();
141
142 const G4DynamicParticle* particle = track.GetDynamicParticle();
143
144 G4double lowLim = lowEnergyLimitDefault;
145 G4double highLim = highEnergyLimitDefault;
146
147 G4double k = particle->GetKineticEnergy();
148
149 const G4String& particleName = particle->GetDefinition()->GetParticleName();
150
151 std::map< G4String,G4double,std::less<G4String> >::iterator pos1;
152 pos1 = lowEnergyLimit.find(particleName);
153
154 if (pos1 != lowEnergyLimit.end())
155 {
156 lowLim = pos1->second;
157 }
158
159 std::map< G4String,G4double,std::less<G4String> >::iterator pos2;
160 pos2 = highEnergyLimit.find(particleName);
161
162 if (pos2 != highEnergyLimit.end())
163 {
164 highLim = pos2->second;
165 }
166
167 if (k >= lowLim && k <= highLim)
168 {
169 G4ParticleMomentum primaryDirection = particle->GetMomentumDirection();
170 G4double particleMass = particle->GetDefinition()->GetPDGMass();
171 G4double totalEnergy = k + particleMass;
172 G4double pSquare = k * (totalEnergy + particleMass);
173 G4double totalMomentum = std::sqrt(pSquare);
174
175 const G4String& particleName = particle->GetDefinition()->GetParticleName();
176
177 G4int ionizationShell = cross.RandomSelect(k,particleName);
178
179 G4double secondaryKinetic = RandomizeEjectedElectronEnergy(particle->GetDefinition(),k,ionizationShell);
180
181 G4double bindingEnergy = waterStructure.IonisationEnergy(ionizationShell);
182
183 G4double cosTheta = 0.;
184 G4double phi = 0.;
185 RandomizeEjectedElectronDirection(track.GetDefinition(), k,secondaryKinetic, cosTheta, phi);
186
187 G4double sinTheta = std::sqrt(1.-cosTheta*cosTheta);
188 G4double dirX = sinTheta*std::cos(phi);
189 G4double dirY = sinTheta*std::sin(phi);
190 G4double dirZ = cosTheta;
191 G4ThreeVector deltaDirection(dirX,dirY,dirZ);
192 deltaDirection.rotateUz(primaryDirection);
193
194 G4double deltaTotalMomentum = std::sqrt(secondaryKinetic*(secondaryKinetic + 2.*electron_mass_c2 ));
195
196 G4double finalPx = totalMomentum*primaryDirection.x() - deltaTotalMomentum*deltaDirection.x();
197 G4double finalPy = totalMomentum*primaryDirection.y() - deltaTotalMomentum*deltaDirection.y();
198 G4double finalPz = totalMomentum*primaryDirection.z() - deltaTotalMomentum*deltaDirection.z();
199 G4double finalMomentum = std::sqrt(finalPx*finalPx + finalPy*finalPy + finalPz*finalPz);
200 finalPx /= finalMomentum;
201 finalPy /= finalMomentum;
202 finalPz /= finalMomentum;
203
204 product.ModifyPrimaryParticle(finalPx,finalPy,finalPz,k-bindingEnergy-secondaryKinetic);
205 product.AddEnergyDeposit(bindingEnergy);
206
207 G4DynamicParticle* aElectron = new G4DynamicParticle(G4Electron::Electron(),deltaDirection,secondaryKinetic);
208 product.AddSecondary(aElectron);
209 }
210
211 return product;
212}
213
214//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
215
216G4double G4FinalStateIonisationBorn::RandomizeEjectedElectronEnergy(G4ParticleDefinition* particleDefinition,
217G4double k, G4int shell)
218{
219 if (particleDefinition == G4Electron::ElectronDefinition())
220 {
221 G4double maximumEnergyTransfer=0.;
222 if ((k+waterStructure.IonisationEnergy(shell))/2. > k) maximumEnergyTransfer=k;
223 else maximumEnergyTransfer = (k+waterStructure.IonisationEnergy(shell))/2.;
224
225 G4double crossSectionMaximum = 0.;
226 for(G4double value=waterStructure.IonisationEnergy(shell); value<=maximumEnergyTransfer; value+=0.1*eV)
227 {
228 G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
229 if(differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
230 }
231
232 G4double secondaryElectronKineticEnergy=0.;
233 do
234 {
235 secondaryElectronKineticEnergy = G4UniformRand() * (maximumEnergyTransfer-waterStructure.IonisationEnergy(shell));
236 } while(G4UniformRand()*crossSectionMaximum >
237 DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+waterStructure.IonisationEnergy(shell))/eV,shell));
238
239 return secondaryElectronKineticEnergy;
240
241 }
242
243 if (particleDefinition == G4Proton::ProtonDefinition())
244 {
245 G4double maximumKineticEnergyTransfer = 4.* (electron_mass_c2 / proton_mass_c2) * k - (waterStructure.IonisationEnergy(shell));
246
247 G4double crossSectionMaximum = 0.;
248 for (G4double value = waterStructure.IonisationEnergy(shell);
249 value<=4.*waterStructure.IonisationEnergy(shell) ;
250 value+=0.1*eV)
251 {
252 G4double differentialCrossSection = DifferentialCrossSection(particleDefinition, k/eV, value/eV, shell);
253 if (differentialCrossSection >= crossSectionMaximum) crossSectionMaximum = differentialCrossSection;
254 }
255
256 G4double secondaryElectronKineticEnergy = 0.;
257 do
258 {
259 secondaryElectronKineticEnergy = G4UniformRand() * maximumKineticEnergyTransfer;
260 } while(G4UniformRand()*crossSectionMaximum >=
261 DifferentialCrossSection(particleDefinition, k/eV,(secondaryElectronKineticEnergy+waterStructure.IonisationEnergy(shell))/eV,shell));
262
263 return secondaryElectronKineticEnergy;
264 }
265
266 return 0;
267}
268
269//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
270
271void G4FinalStateIonisationBorn::RandomizeEjectedElectronDirection(G4ParticleDefinition* particleDefinition,
272 G4double k,
273 G4double secKinetic,
274 G4double & cosTheta,
275 G4double & phi )
276{
277 if (particleDefinition == G4Electron::ElectronDefinition())
278 {
279 phi = twopi * G4UniformRand();
280 if (secKinetic < 50.*eV) cosTheta = (2.*G4UniformRand())-1.;
281 else if (secKinetic <= 200.*eV)
282 {
283 if (G4UniformRand() <= 0.1) cosTheta = (2.*G4UniformRand())-1.;
284 else cosTheta = G4UniformRand()*(std::sqrt(2.)/2);
285 }
286 else
287 {
288 G4double sin2O = (1.-secKinetic/k) / (1.+secKinetic/(2.*electron_mass_c2));
289 cosTheta = std::sqrt(1.-sin2O);
290 }
291 }
292
293 if (particleDefinition == G4Proton::ProtonDefinition())
294 {
295 G4double maxSecKinetic = 4.* (electron_mass_c2 / proton_mass_c2) * k;
296 phi = twopi * G4UniformRand();
297 cosTheta = std::sqrt(secKinetic / maxSecKinetic);
298 }
299}
300
301//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
302
303double G4FinalStateIonisationBorn::DifferentialCrossSection(G4ParticleDefinition * particleDefinition,
304 G4double k,
305 G4double energyTransfer,
306 G4int ionizationLevelIndex)
307{
308 G4double sigma = 0.;
309
310 if (energyTransfer >= waterStructure.IonisationEnergy(ionizationLevelIndex))
311 {
312 G4double valueT1 = 0;
313 G4double valueT2 = 0;
314 G4double valueE21 = 0;
315 G4double valueE22 = 0;
316 G4double valueE12 = 0;
317 G4double valueE11 = 0;
318
319 G4double xs11 = 0;
320 G4double xs12 = 0;
321 G4double xs21 = 0;
322 G4double xs22 = 0;
323
324 if (particleDefinition == G4Electron::ElectronDefinition())
325 {
326 // k should be in eV and energy transfer eV also
327
328 std::vector<double>::iterator t2 = std::upper_bound(eTdummyVec.begin(),eTdummyVec.end(), k);
329
330 std::vector<double>::iterator t1 = t2-1;
331
332 // SI : the following condition avoids situations where energyTransfer >last vector element
333 if (energyTransfer <= eVecm[(*t1)].back())
334 {
335 std::vector<double>::iterator e12 = std::upper_bound(eVecm[(*t1)].begin(),eVecm[(*t1)].end(), energyTransfer);
336 std::vector<double>::iterator e11 = e12-1;
337
338 std::vector<double>::iterator e22 = std::upper_bound(eVecm[(*t2)].begin(),eVecm[(*t2)].end(), energyTransfer);
339 std::vector<double>::iterator e21 = e22-1;
340
341 valueT1 =*t1;
342 valueT2 =*t2;
343 valueE21 =*e21;
344 valueE22 =*e22;
345 valueE12 =*e12;
346 valueE11 =*e11;
347
348 xs11 = eDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE11];
349 xs12 = eDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE12];
350 xs21 = eDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE21];
351 xs22 = eDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE22];
352 }
353
354 }
355
356 if (particleDefinition == G4Proton::ProtonDefinition())
357 {
358 // k should be in eV and energy transfer eV also
359 std::vector<double>::iterator t2 = std::upper_bound(pTdummyVec.begin(),pTdummyVec.end(), k);
360 std::vector<double>::iterator t1 = t2-1;
361
362 std::vector<double>::iterator e12 = std::upper_bound(pVecm[(*t1)].begin(),pVecm[(*t1)].end(), energyTransfer);
363 std::vector<double>::iterator e11 = e12-1;
364
365 std::vector<double>::iterator e22 = std::upper_bound(pVecm[(*t2)].begin(),pVecm[(*t2)].end(), energyTransfer);
366 std::vector<double>::iterator e21 = e22-1;
367
368 valueT1 =*t1;
369 valueT2 =*t2;
370 valueE21 =*e21;
371 valueE22 =*e22;
372 valueE12 =*e12;
373 valueE11 =*e11;
374
375 xs11 = pDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE11];
376 xs12 = pDiffCrossSectionData[ionizationLevelIndex][valueT1][valueE12];
377 xs21 = pDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE21];
378 xs22 = pDiffCrossSectionData[ionizationLevelIndex][valueT2][valueE22];
379
380 }
381
382 G4double xsProduct = xs11 * xs12 * xs21 * xs22;
383 if (xsProduct != 0.)
384 {
385 sigma = QuadInterpolator( valueE11, valueE12,
386 valueE21, valueE22,
387 xs11, xs12,
388 xs21, xs22,
389 valueT1, valueT2,
390 k, energyTransfer);
391 }
392
393 }
394
395 return sigma;
396}
397
398//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
399
400G4double G4FinalStateIonisationBorn::LogLogInterpolate(G4double e1,
401 G4double e2,
402 G4double e,
403 G4double xs1,
404 G4double xs2)
405{
406 G4double a = (std::log10(xs2)-std::log10(xs1)) / (std::log10(e2)-std::log10(e1));
407 G4double b = std::log10(xs2) - a*std::log10(e2);
408 G4double sigma = a*std::log10(e) + b;
409 G4double value = (std::pow(10.,sigma));
410 return value;
411}
412
413//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
414
415G4double G4FinalStateIonisationBorn::QuadInterpolator(G4double e11, G4double e12,
416 G4double e21, G4double e22,
417 G4double xs11, G4double xs12,
418 G4double xs21, G4double xs22,
419 G4double t1, G4double t2,
420 G4double t, G4double e)
421{
422 G4double interpolatedvalue1 = LogLogInterpolate(e11, e12, e, xs11, xs12);
423 G4double interpolatedvalue2 = LogLogInterpolate(e21, e22, e, xs21, xs22);
424 G4double value = LogLogInterpolate(t1, t2, t, interpolatedvalue1, interpolatedvalue2);
425 return value;
426}
427
428
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