source: trunk/source/processes/electromagnetic/utils/src/G4VEmModel.cc@ 1344

Last change on this file since 1344 was 1340, checked in by garnier, 15 years ago

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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 *
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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 *
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24// ********************************************************************
25//
26// $Id: G4VEmModel.cc,v 1.37 2010/10/14 16:27:35 vnivanch Exp $
27// GEANT4 tag $Name: emutils-V09-03-23 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name: G4VEmModel
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 25.07.2005
39//
40// Modifications:
41// 25.10.2005 Set default highLimit=100.TeV (V.Ivanchenko)
42// 06.02.2006 add method ComputeMeanFreePath() (mma)
43// 16.02.2009 Move implementations of virtual methods to source (VI)
44//
45//
46// Class Description:
47//
48// Abstract interface to energy loss models
49
50// -------------------------------------------------------------------
51//
52
53#include "G4VEmModel.hh"
54#include "G4LossTableManager.hh"
55#include "G4ProductionCutsTable.hh"
56#include "G4ParticleChangeForLoss.hh"
57#include "G4ParticleChangeForGamma.hh"
58
59//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
60//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
61
62G4VEmModel::G4VEmModel(const G4String& nam):
63 flucModel(0),anglModel(0), name(nam), lowLimit(0.1*keV), highLimit(100.0*TeV),
64 eMinActive(0.0),eMaxActive(DBL_MAX),
65 polarAngleLimit(0.0),secondaryThreshold(DBL_MAX),theLPMflag(false),
66 pParticleChange(0),/*nuclearStopping(false),*/
67 currentCouple(0),currentElement(0),
68 nsec(5),flagDeexcitation(false)
69{
70 xsec.resize(nsec);
71 nSelectors = 0;
72 G4LossTableManager::Instance()->Register(this);
73}
74
75//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
76
77G4VEmModel::~G4VEmModel()
78{
79 G4LossTableManager::Instance()->DeRegister(this);
80 G4int n = elmSelectors.size();
81 if(n > 0) {
82 for(G4int i=0; i<n; ++i) {
83 delete elmSelectors[i];
84 }
85 }
86 delete anglModel;
87}
88
89//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
90
91G4ParticleChangeForLoss* G4VEmModel::GetParticleChangeForLoss()
92{
93 G4ParticleChangeForLoss* p = 0;
94 if (pParticleChange) {
95 p = static_cast<G4ParticleChangeForLoss*>(pParticleChange);
96 } else {
97 p = new G4ParticleChangeForLoss();
98 pParticleChange = p;
99 }
100 return p;
101}
102
103//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
104
105G4ParticleChangeForGamma* G4VEmModel::GetParticleChangeForGamma()
106{
107 G4ParticleChangeForGamma* p = 0;
108 if (pParticleChange) {
109 p = static_cast<G4ParticleChangeForGamma*>(pParticleChange);
110 } else {
111 p = new G4ParticleChangeForGamma();
112 pParticleChange = p;
113 }
114 return p;
115}
116
117//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
118
119void G4VEmModel::InitialiseElementSelectors(const G4ParticleDefinition* p,
120 const G4DataVector& cuts)
121{
122 // initialise before run
123 flagDeexcitation = false;
124 G4LossTableManager* man = G4LossTableManager::Instance();
125 G4bool spline = man->SplineFlag();
126
127 // two times less bins because probability functon is normalized
128 // so correspondingly is more smooth
129 G4int nbins = (man->GetNumberOfBinsPerDecade()/3)*
130 G4int(std::log10(highLimit/lowLimit) + 0.5);
131 if(nbins < 5) { nbins = 5; }
132
133 G4ProductionCutsTable* theCoupleTable=
134 G4ProductionCutsTable::GetProductionCutsTable();
135 G4int numOfCouples = theCoupleTable->GetTableSize();
136
137 // prepare vector
138 if(numOfCouples > nSelectors) {
139 elmSelectors.reserve(numOfCouples);
140 for(G4int i=nSelectors; i<numOfCouples; ++i) { elmSelectors.push_back(0); }
141 nSelectors = numOfCouples;
142 }
143
144 // initialise vector
145 for(G4int i=0; i<numOfCouples; ++i) {
146 currentCouple = theCoupleTable->GetMaterialCutsCouple(i);
147 const G4Material* material = currentCouple->GetMaterial();
148 G4int idx = currentCouple->GetIndex();
149
150 // selector already exist check if should be deleted
151 G4bool create = true;
152 if(elmSelectors[i]) {
153 if(material == elmSelectors[i]->GetMaterial()) { create = false; }
154 else { delete elmSelectors[i]; }
155 }
156 if(create) {
157 elmSelectors[i] = new G4EmElementSelector(this,material,nbins,
158 lowLimit,highLimit,spline);
159 }
160 elmSelectors[i]->Initialise(p, cuts[idx]);
161 //elmSelectors[i]->Dump(p);
162 }
163}
164
165//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
166
167G4double G4VEmModel::ComputeDEDXPerVolume(const G4Material*,
168 const G4ParticleDefinition*,
169 G4double,G4double)
170{
171 return 0.0;
172}
173
174//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
175
176G4double G4VEmModel::CrossSectionPerVolume(const G4Material* material,
177 const G4ParticleDefinition* p,
178 G4double ekin,
179 G4double emin,
180 G4double emax)
181{
182 SetupForMaterial(p, material, ekin);
183 G4double cross = 0.0;
184 const G4ElementVector* theElementVector = material->GetElementVector();
185 const G4double* theAtomNumDensityVector = material->GetVecNbOfAtomsPerVolume();
186 G4int nelm = material->GetNumberOfElements();
187 if(nelm > nsec) {
188 xsec.resize(nelm);
189 nsec = nelm;
190 }
191 for (G4int i=0; i<nelm; i++) {
192 cross += theAtomNumDensityVector[i]*
193 ComputeCrossSectionPerAtom(p,(*theElementVector)[i],ekin,emin,emax);
194 xsec[i] = cross;
195 }
196 return cross;
197}
198
199//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
200
201const G4Element* G4VEmModel::SelectRandomAtom(const G4Material* material,
202 const G4ParticleDefinition* pd,
203 G4double kinEnergy,
204 G4double tcut,
205 G4double tmax)
206{
207 const G4ElementVector* theElementVector = material->GetElementVector();
208 G4int n = material->GetNumberOfElements() - 1;
209 currentElement = (*theElementVector)[n];
210 if (n > 0) {
211 G4double x = G4UniformRand()*
212 G4VEmModel::CrossSectionPerVolume(material,pd,kinEnergy,tcut,tmax);
213 for(G4int i=0; i<n; ++i) {
214 if (x <= xsec[i]) {
215 currentElement = (*theElementVector)[i];
216 break;
217 }
218 }
219 }
220 return currentElement;
221}
222
223//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
224
225G4double G4VEmModel::ComputeCrossSectionPerAtom(const G4ParticleDefinition*,
226 G4double, G4double, G4double,
227 G4double, G4double)
228{
229 return 0.0;
230}
231
232//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
233
234void G4VEmModel::DefineForRegion(const G4Region*)
235{}
236
237//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
238
239G4double G4VEmModel::MinEnergyCut(const G4ParticleDefinition*,
240 const G4MaterialCutsCouple*)
241{
242 return 0.0;
243}
244
245//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
246
247G4double G4VEmModel::ChargeSquareRatio(const G4Track& track)
248{
249 return GetChargeSquareRatio(track.GetParticleDefinition(),
250 track.GetMaterial(), track.GetKineticEnergy());
251}
252
253//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
254
255G4double G4VEmModel::GetChargeSquareRatio(const G4ParticleDefinition* p,
256 const G4Material*, G4double)
257{
258 G4double q = p->GetPDGCharge()/CLHEP::eplus;
259 return q*q;
260}
261
262//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
263
264G4double G4VEmModel::GetParticleCharge(const G4ParticleDefinition* p,
265 const G4Material*, G4double)
266{
267 return p->GetPDGCharge();
268}
269
270//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
271
272void G4VEmModel::CorrectionsAlongStep(const G4MaterialCutsCouple*,
273 const G4DynamicParticle*,
274 G4double&,G4double&,G4double)
275{}
276
277//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
278
279void G4VEmModel::SampleDeexcitationAlongStep(const G4Material*,
280 const G4Track&,
281 G4double& )
282{}
283
284//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
285
286G4double G4VEmModel::MaxSecondaryEnergy(const G4ParticleDefinition*,
287 G4double kineticEnergy)
288{
289 return kineticEnergy;
290}
291
292//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
293
294void G4VEmModel::SetupForMaterial(const G4ParticleDefinition*,
295 const G4Material*, G4double)
296{}
297
298//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
299
300void
301G4VEmModel::SetParticleChange(G4VParticleChange* p, G4VEmFluctuationModel* f)
302{
303 if(p && pParticleChange != p) { pParticleChange = p; }
304 flucModel = f;
305}
306
307//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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