1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
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 * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4LivermorePhotoElectricModel.cc,v 1.11 2010/03/26 09:32:50 pandola Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-04-beta-cand-01 $ |
---|
28 | // |
---|
29 | // |
---|
30 | // Author: Sebastien Inserti |
---|
31 | // 30 October 2008 |
---|
32 | // |
---|
33 | // History: |
---|
34 | // -------- |
---|
35 | // 15 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
---|
36 | // - apply internal high-energy limit only in constructor |
---|
37 | // - do not apply low-energy limit (default is 0) |
---|
38 | // - remove GetMeanFreePath method and table |
---|
39 | // - simplify sampling of deexcitation by using cut in energy |
---|
40 | // - added protection against numerical problem in energy sampling |
---|
41 | // - use G4ElementSelector |
---|
42 | // 23 Oct 2009 L Pandola |
---|
43 | // - atomic deexcitation managed via G4VEmModel::DeexcitationFlag() is |
---|
44 | // set as "true" (default would be false) |
---|
45 | // 15 Mar 2010 L Pandola |
---|
46 | // - removed methods to set explicitely fluorescence cuts. |
---|
47 | // Main cuts from G4ProductionCutsTable are always used |
---|
48 | // |
---|
49 | |
---|
50 | #include "G4LivermorePhotoElectricModel.hh" |
---|
51 | |
---|
52 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
53 | |
---|
54 | using namespace std; |
---|
55 | |
---|
56 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
57 | |
---|
58 | G4LivermorePhotoElectricModel::G4LivermorePhotoElectricModel(const G4ParticleDefinition*, |
---|
59 | const G4String& nam) |
---|
60 | :G4VEmModel(nam),isInitialised(false),meanFreePathTable(0), |
---|
61 | crossSectionHandler(0),shellCrossSectionHandler(0),ElectronAngularGenerator(0) |
---|
62 | { |
---|
63 | lowEnergyLimit = 250 * eV; |
---|
64 | highEnergyLimit = 100 * GeV; |
---|
65 | // SetLowEnergyLimit(lowEnergyLimit); |
---|
66 | SetHighEnergyLimit(highEnergyLimit); |
---|
67 | |
---|
68 | verboseLevel= 0; |
---|
69 | // Verbosity scale: |
---|
70 | // 0 = nothing |
---|
71 | // 1 = warning for energy non-conservation |
---|
72 | // 2 = details of energy budget |
---|
73 | // 3 = calculation of cross sections, file openings, sampling of atoms |
---|
74 | // 4 = entering in methods |
---|
75 | |
---|
76 | //Set atomic deexcitation by default |
---|
77 | SetDeexcitationFlag(true); |
---|
78 | ActivateAuger(false); |
---|
79 | |
---|
80 | if(verboseLevel>0) { |
---|
81 | G4cout << "Livermore PhotoElectric is constructed " << G4endl |
---|
82 | << "Energy range: " |
---|
83 | << lowEnergyLimit / eV << " eV - " |
---|
84 | << highEnergyLimit / GeV << " GeV" |
---|
85 | << G4endl; |
---|
86 | } |
---|
87 | } |
---|
88 | |
---|
89 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
90 | |
---|
91 | G4LivermorePhotoElectricModel::~G4LivermorePhotoElectricModel() |
---|
92 | { |
---|
93 | if (crossSectionHandler) delete crossSectionHandler; |
---|
94 | if (shellCrossSectionHandler) delete shellCrossSectionHandler; |
---|
95 | if (ElectronAngularGenerator) delete ElectronAngularGenerator; |
---|
96 | } |
---|
97 | |
---|
98 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
99 | |
---|
100 | void |
---|
101 | G4LivermorePhotoElectricModel::Initialise(const G4ParticleDefinition*, |
---|
102 | const G4DataVector&) |
---|
103 | { |
---|
104 | if (verboseLevel > 3) |
---|
105 | G4cout << "Calling G4LivermorePhotoElectricModel::Initialise()" << G4endl; |
---|
106 | |
---|
107 | if (crossSectionHandler) |
---|
108 | { |
---|
109 | crossSectionHandler->Clear(); |
---|
110 | delete crossSectionHandler; |
---|
111 | } |
---|
112 | |
---|
113 | if (shellCrossSectionHandler) |
---|
114 | { |
---|
115 | shellCrossSectionHandler->Clear(); |
---|
116 | delete shellCrossSectionHandler; |
---|
117 | } |
---|
118 | |
---|
119 | // Read data tables for all materials |
---|
120 | |
---|
121 | crossSectionHandler = new G4CrossSectionHandler(); |
---|
122 | crossSectionHandler->Clear(); |
---|
123 | G4String crossSectionFile = "phot/pe-cs-"; |
---|
124 | crossSectionHandler->LoadData(crossSectionFile); |
---|
125 | |
---|
126 | shellCrossSectionHandler = new G4CrossSectionHandler(); |
---|
127 | shellCrossSectionHandler->Clear(); |
---|
128 | G4String shellCrossSectionFile = "phot/pe-ss-cs-"; |
---|
129 | shellCrossSectionHandler->LoadShellData(shellCrossSectionFile); |
---|
130 | |
---|
131 | // default generator |
---|
132 | ElectronAngularGenerator = |
---|
133 | new G4PhotoElectricAngularGeneratorSauterGavrila("GEANTSauterGavrilaGenerator"); |
---|
134 | |
---|
135 | // |
---|
136 | if (verboseLevel > 2) |
---|
137 | G4cout << "Loaded cross section files for Livermore PhotoElectric model" << G4endl; |
---|
138 | |
---|
139 | // InitialiseElementSelectors(particle,cuts); |
---|
140 | |
---|
141 | if (verboseLevel > 0) { |
---|
142 | G4cout << "Livermore PhotoElectric model is initialized " << G4endl |
---|
143 | << "Energy range: " |
---|
144 | << LowEnergyLimit() / eV << " eV - " |
---|
145 | << HighEnergyLimit() / GeV << " GeV" |
---|
146 | << G4endl; |
---|
147 | } |
---|
148 | |
---|
149 | if(isInitialised) return; |
---|
150 | fParticleChange = GetParticleChangeForGamma(); |
---|
151 | isInitialised = true; |
---|
152 | } |
---|
153 | |
---|
154 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
155 | |
---|
156 | G4double G4LivermorePhotoElectricModel::ComputeCrossSectionPerAtom( |
---|
157 | const G4ParticleDefinition*, |
---|
158 | G4double GammaEnergy, |
---|
159 | G4double Z, G4double, |
---|
160 | G4double, G4double) |
---|
161 | { |
---|
162 | if (verboseLevel > 3) |
---|
163 | G4cout << "Calling ComputeCrossSectionPerAtom() of G4LivermorePhotoElectricModel" |
---|
164 | << G4endl; |
---|
165 | |
---|
166 | if (GammaEnergy < lowEnergyLimit || GammaEnergy > highEnergyLimit) |
---|
167 | return 0; |
---|
168 | |
---|
169 | G4double cs = crossSectionHandler->FindValue(G4int(Z), GammaEnergy); |
---|
170 | return cs; |
---|
171 | } |
---|
172 | |
---|
173 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
174 | |
---|
175 | void |
---|
176 | G4LivermorePhotoElectricModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
---|
177 | const G4MaterialCutsCouple* couple, |
---|
178 | const G4DynamicParticle* aDynamicGamma, |
---|
179 | G4double, |
---|
180 | G4double) |
---|
181 | { |
---|
182 | |
---|
183 | // Fluorescence generated according to: |
---|
184 | // J. Stepanek ,"A program to determine the radiation spectra due to a single atomic |
---|
185 | // subshell ionisation by a particle or due to deexcitation or decay of radionuclides", |
---|
186 | // Comp. Phys. Comm. 1206 pp 1-1-9 (1997) |
---|
187 | |
---|
188 | if (verboseLevel > 3) |
---|
189 | G4cout << "Calling SampleSecondaries() of G4LivermorePhotoElectricModel" << G4endl; |
---|
190 | |
---|
191 | G4double photonEnergy = aDynamicGamma->GetKineticEnergy(); |
---|
192 | |
---|
193 | // kill incident photon |
---|
194 | fParticleChange->SetProposedKineticEnergy(0.); |
---|
195 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
---|
196 | |
---|
197 | // low-energy gamma is absorpted by this process |
---|
198 | if (photonEnergy <= lowEnergyLimit) |
---|
199 | { |
---|
200 | fParticleChange->ProposeLocalEnergyDeposit(photonEnergy); |
---|
201 | return; |
---|
202 | } |
---|
203 | |
---|
204 | // Returns the normalized direction of the momentum |
---|
205 | G4ThreeVector photonDirection = aDynamicGamma->GetMomentumDirection(); |
---|
206 | |
---|
207 | // Select randomly one element in the current material |
---|
208 | // G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy); |
---|
209 | const G4ParticleDefinition* particle = aDynamicGamma->GetDefinition(); |
---|
210 | const G4Element* elm = SelectRandomAtom(couple->GetMaterial(),particle,photonEnergy); |
---|
211 | G4int Z = (G4int)elm->GetZ(); |
---|
212 | |
---|
213 | // Select the ionised shell in the current atom according to shell cross sections |
---|
214 | size_t shellIndex = shellCrossSectionHandler->SelectRandomShell(Z,photonEnergy); |
---|
215 | |
---|
216 | // Retrieve the corresponding identifier and binding energy of the selected shell |
---|
217 | const G4AtomicTransitionManager* transitionManager = G4AtomicTransitionManager::Instance(); |
---|
218 | const G4AtomicShell* shell = transitionManager->Shell(Z,shellIndex); |
---|
219 | G4double bindingEnergy = shell->BindingEnergy(); |
---|
220 | G4int shellId = shell->ShellId(); |
---|
221 | |
---|
222 | // Primary outcoming electron |
---|
223 | G4double eKineticEnergy = photonEnergy - bindingEnergy; |
---|
224 | |
---|
225 | // There may be cases where the binding energy of the selected shell is > photon energy |
---|
226 | // In such cases do not generate secondaries |
---|
227 | if (eKineticEnergy > 0.) |
---|
228 | { |
---|
229 | // Calculate direction of the photoelectron |
---|
230 | G4ThreeVector gammaPolarization = aDynamicGamma->GetPolarization(); |
---|
231 | G4ThreeVector electronDirection = |
---|
232 | ElectronAngularGenerator->GetPhotoElectronDirection(photonDirection, |
---|
233 | eKineticEnergy, |
---|
234 | gammaPolarization, |
---|
235 | shellId); |
---|
236 | |
---|
237 | // The electron is created ... |
---|
238 | G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(), |
---|
239 | electronDirection, |
---|
240 | eKineticEnergy); |
---|
241 | fvect->push_back(electron); |
---|
242 | } |
---|
243 | else |
---|
244 | { |
---|
245 | bindingEnergy = photonEnergy; |
---|
246 | } |
---|
247 | |
---|
248 | // deexcitation |
---|
249 | if(DeexcitationFlag() && Z > 5) { |
---|
250 | |
---|
251 | const G4ProductionCutsTable* theCoupleTable= |
---|
252 | G4ProductionCutsTable::GetProductionCutsTable(); |
---|
253 | |
---|
254 | size_t index = couple->GetIndex(); |
---|
255 | G4double cutg = (*(theCoupleTable->GetEnergyCutsVector(0)))[index]; |
---|
256 | G4double cute = (*(theCoupleTable->GetEnergyCutsVector(1)))[index]; |
---|
257 | |
---|
258 | // Generation of fluorescence |
---|
259 | // Data in EADL are available only for Z > 5 |
---|
260 | // Protection to avoid generating photons in the unphysical case of |
---|
261 | // shell binding energy > photon energy |
---|
262 | if (bindingEnergy > cutg || bindingEnergy > cute) |
---|
263 | { |
---|
264 | G4DynamicParticle* aPhoton; |
---|
265 | deexcitationManager.SetCutForSecondaryPhotons(cutg); |
---|
266 | deexcitationManager.SetCutForAugerElectrons(cute); |
---|
267 | |
---|
268 | std::vector<G4DynamicParticle*>* photonVector = |
---|
269 | deexcitationManager.GenerateParticles(Z,shellId); |
---|
270 | size_t nTotPhotons = photonVector->size(); |
---|
271 | for (size_t k=0; k<nTotPhotons; k++) |
---|
272 | { |
---|
273 | aPhoton = (*photonVector)[k]; |
---|
274 | if (aPhoton) |
---|
275 | { |
---|
276 | G4double itsEnergy = aPhoton->GetKineticEnergy(); |
---|
277 | if (itsEnergy <= bindingEnergy) |
---|
278 | { |
---|
279 | // Local energy deposit is given as the sum of the |
---|
280 | // energies of incident photons minus the energies |
---|
281 | // of the outcoming fluorescence photons |
---|
282 | bindingEnergy -= itsEnergy; |
---|
283 | fvect->push_back(aPhoton); |
---|
284 | } |
---|
285 | else |
---|
286 | { |
---|
287 | // abnormal case of energy non-conservation |
---|
288 | delete aPhoton; |
---|
289 | (*photonVector)[k] = 0; |
---|
290 | } |
---|
291 | } |
---|
292 | } |
---|
293 | delete photonVector; |
---|
294 | } |
---|
295 | } |
---|
296 | // excitation energy left |
---|
297 | fParticleChange->ProposeLocalEnergyDeposit(bindingEnergy); |
---|
298 | } |
---|
299 | |
---|
300 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
301 | |
---|
302 | void G4LivermorePhotoElectricModel::ActivateAuger(G4bool augerbool) |
---|
303 | { |
---|
304 | if (!DeexcitationFlag() && augerbool) |
---|
305 | { |
---|
306 | G4cout << "WARNING - G4PenelopePhotoElectricModel" << G4endl; |
---|
307 | G4cout << "The use of the Atomic Deexcitation Manager is set to false " << G4endl; |
---|
308 | G4cout << "Therefore, Auger electrons will be not generated anyway" << G4endl; |
---|
309 | } |
---|
310 | deexcitationManager.ActivateAugerElectronProduction(augerbool); |
---|
311 | if (verboseLevel > 1) |
---|
312 | G4cout << "Auger production set to " << augerbool << G4endl; |
---|
313 | } |
---|
314 | |
---|
315 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
316 | |
---|
317 | void |
---|
318 | G4LivermorePhotoElectricModel::SetAngularGenerator(G4VPhotoElectricAngularDistribution* dist) |
---|
319 | { |
---|
320 | ElectronAngularGenerator = dist; |
---|
321 | ElectronAngularGenerator->PrintGeneratorInformation(); |
---|
322 | } |
---|
323 | |
---|
324 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
325 | |
---|
326 | void G4LivermorePhotoElectricModel::SetAngularGenerator(const G4String& name) |
---|
327 | { |
---|
328 | if (name == "default") |
---|
329 | { |
---|
330 | delete ElectronAngularGenerator; |
---|
331 | ElectronAngularGenerator = |
---|
332 | new G4PhotoElectricAngularGeneratorSimple("GEANT4LowEnergySimpleGenerator"); |
---|
333 | generatorName = name; |
---|
334 | } |
---|
335 | else if (name == "standard") |
---|
336 | { |
---|
337 | delete ElectronAngularGenerator; |
---|
338 | ElectronAngularGenerator = |
---|
339 | new G4PhotoElectricAngularGeneratorSauterGavrila("GEANT4SauterGavrilaGenerator"); |
---|
340 | generatorName = name; |
---|
341 | } |
---|
342 | else if (name == "polarized") |
---|
343 | { |
---|
344 | delete ElectronAngularGenerator; |
---|
345 | ElectronAngularGenerator = |
---|
346 | new G4PhotoElectricAngularGeneratorPolarized("GEANT4LowEnergyPolarizedGenerator"); |
---|
347 | generatorName = name; |
---|
348 | } |
---|
349 | else |
---|
350 | { |
---|
351 | G4Exception("G4LowEnergyPhotoElectric::SetAngularGenerator - generator does not exist"); |
---|
352 | } |
---|
353 | |
---|
354 | ElectronAngularGenerator->PrintGeneratorInformation(); |
---|
355 | } |
---|
356 | |
---|