source: trunk/source/processes/electromagnetic/utils/src/G4EmSaturation.cc@ 1201

Last change on this file since 1201 was 1196, checked in by garnier, 16 years ago

update CVS release candidate geant4.9.3.01
  • Property svn:executable set to *
File size: 8.7 KB
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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 *
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 *
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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 *
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: G4EmSaturation.cc,v 1.10 2009/09/25 09:16:40 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03-cand-01 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name: G4EmSaturation
35//
36// Author: Vladimir Ivanchenko
37//
38// Creation date: 18.02.2008
39//
40// Modifications:
41//
42// -------------------------------------------------------------
43
44//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
45//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46
47#include "G4EmSaturation.hh"
48#include "G4LossTableManager.hh"
49#include "G4NistManager.hh"
50#include "G4Material.hh"
51#include "G4MaterialCutsCouple.hh"
52#include "G4Electron.hh"
53#include "G4Proton.hh"
54
55//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56
57G4EmSaturation::G4EmSaturation()
58{
59 verbose = 1;
60 manager = 0;
61 curMaterial = 0;
62 curBirks = 0.0;
63 curRatio = 1.0;
64 curChargeSq = 1.0;
65 nMaterials = 0;
66 electron = 0;
67 Initialise();
68}
69
70//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71
72G4EmSaturation::~G4EmSaturation()
73{}
74
75//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
76
77G4double G4EmSaturation::VisibleEnergyDeposition(
78 const G4ParticleDefinition* p,
79 const G4MaterialCutsCouple* couple,
80 G4double length,
81 G4double edep,
82 G4double niel)
83{
84 if(edep <= 0.0) return 0.0;
85
86 G4double evis = edep;
87 G4double bfactor = FindBirksCoefficient(couple->GetMaterial());
88
89 if(bfactor > 0.0) {
90
91 G4int pdgCode = p->GetPDGEncoding();
92 // atomic relaxations for gamma incident
93 if(22 == pdgCode) {
94 evis /= (1.0 + bfactor*edep/manager->GetRange(electron,edep,couple));
95
96 // energy loss
97 } else {
98
99 // protections
100 G4double nloss = niel;
101 if(nloss < 0.0) nloss = 0.0;
102 G4double eloss = edep - nloss;
103
104 // neutrons
105 if(2112 == pdgCode || eloss < 0.0 || length <= 0.0) {
106 nloss = edep;
107 eloss = 0.0;
108 }
109
110 // continues energy loss
111 if(eloss > 0.0) eloss /= (1.0 + bfactor*eloss/length);
112
113 // non-ionizing energy loss
114 if(nloss > 0.0) {
115 if(!proton) {proton = G4Proton::Proton();}
116 G4double escaled = nloss*curRatio;
117 G4double s = manager->GetRange(proton,escaled,couple)/curChargeSq;
118 nloss /= (1.0 + bfactor*nloss/s);
119 }
120
121 evis = eloss + nloss;
122 }
123 }
124
125 return evis;
126}
127
128//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
129
130G4double G4EmSaturation::FindG4BirksCoefficient(const G4Material* mat)
131{
132 G4String name = mat->GetName();
133 // is this material in the vector?
134
135 for(G4int j=0; j<nG4Birks; j++) {
136 if(name == g4MatNames[j]) {
137 if(verbose > 0)
138 G4cout << "### G4EmSaturation::FindG4BirksCoefficient for "
139 << name << " is " << g4MatData[j]*MeV/mm << " mm/MeV "
140 << G4endl;
141 return g4MatData[j];
142 }
143 }
144 return FindBirksCoefficient(mat);
145}
146
147//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
148
149G4double G4EmSaturation::FindBirksCoefficient(const G4Material* mat)
150{
151 // electron should exist in any case
152 if(!manager) {
153 manager = G4LossTableManager::Instance();
154 nist = G4NistManager::Instance();
155 electron= G4Electron::Electron();
156 proton = 0;
157 }
158
159 if(mat == curMaterial) return curBirks;
160
161 curMaterial = mat;
162 curBirks = 0.0;
163 curRatio = 1.0;
164 curChargeSq = 1.0;
165
166 // seach in the run-time list
167 for(G4int i=0; i<nMaterials; i++) {
168 if(mat == matPointers[i]) {
169 curBirks = mat->GetIonisation()->GetBirksConstant();
170 curRatio = massFactors[i];
171 curChargeSq = effCharges[i];
172 return curBirks;
173 }
174 }
175
176 G4String name = mat->GetName();
177 curBirks = mat->GetIonisation()->GetBirksConstant();
178
179 // material has no Birks coeffitient defined
180 // seach in the Geant4 list
181 if(curBirks == 0.0) {
182 for(G4int j=0; j<nG4Birks; j++) {
183 if(name == g4MatNames[j]) {
184 mat->GetIonisation()->SetBirksConstant(g4MatData[j]);
185 curBirks = g4MatData[j];
186 break;
187 }
188 }
189 }
190
191 if(curBirks == 0.0 && verbose > 0) {
192 G4cout << "### G4EmSaturation::FindBirksCoefficient fails "
193 " for material " << name << G4endl;
194 }
195
196 // compute mean mass ratio
197 curRatio = 0.0;
198 curChargeSq = 0.0;
199 G4double norm = 0.0;
200 const G4ElementVector* theElementVector = mat->GetElementVector();
201 const G4double* theAtomNumDensityVector = mat->GetVecNbOfAtomsPerVolume();
202 size_t nelm = mat->GetNumberOfElements();
203 for (size_t i=0; i<nelm; i++) {
204 const G4Element* elm = (*theElementVector)[i];
205 G4double Z = elm->GetZ();
206 G4double w = Z*Z*theAtomNumDensityVector[i];
207 curRatio += w/nist->GetAtomicMassAmu(G4int(Z));
208 curChargeSq = Z*Z*w;
209 norm += w;
210 }
211 curRatio *= proton_mass_c2/norm;
212 curChargeSq /= norm;
213
214 // store results
215 matPointers.push_back(mat);
216 matNames.push_back(name);
217 massFactors.push_back(curRatio);
218 effCharges.push_back(curChargeSq);
219 nMaterials++;
220 if(curBirks > 0.0 && verbose > 0) {
221 G4cout << "### G4EmSaturation::FindBirksCoefficient Birks coefficient for "
222 << name << " " << curBirks*MeV/mm << " mm/MeV" << G4endl;
223 }
224 return curBirks;
225}
226
227//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
228
229void G4EmSaturation::DumpBirksCoefficients()
230{
231 if(nMaterials > 0) {
232 G4cout << "### Birks coeffitients used in run time" << G4endl;
233 for(G4int i=0; i<nMaterials; i++) {
234 G4double br = matPointers[i]->GetIonisation()->GetBirksConstant();
235 G4cout << " " << matNames[i] << " "
236 << br*MeV/mm << " mm/MeV" << " "
237 << br*matPointers[i]->GetDensity()*MeV*cm2/g
238 << " g/cm^2/MeV"
239 << G4endl;
240 }
241 }
242}
243
244//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
245
246void G4EmSaturation::DumpG4BirksCoefficients()
247{
248 if(nG4Birks > 0) {
249 G4cout << "### Birks coeffitients for Geant4 materials" << G4endl;
250 for(G4int i=0; i<nG4Birks; i++) {
251 G4cout << " " << g4MatNames[i] << " "
252 << g4MatData[i]*MeV/mm << " mm/MeV" << G4endl;
253 }
254 }
255}
256
257//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
258
259void G4EmSaturation::Initialise()
260{
261 // M.Hirschberg et al., IEEE Trans. Nuc. Sci. 39 (1992) 511
262 // SCSN-38 kB = 0.00842 g/cm^2/MeV; rho = 1.06 g/cm^3
263 g4MatNames.push_back("G4_POLYSTYRENE");
264 g4MatData.push_back(0.07943*mm/MeV);
265
266 // C.Fabjan (private communication)
267 // kB = 0.006 g/cm^2/MeV; rho = 7.13 g/cm^3
268 g4MatNames.push_back("G4_BGO");
269 g4MatData.push_back(0.008415*mm/MeV);
270
271 // A.Ribon analysis of publications
272 // Scallettar et al., Phys. Rev. A25 (1982) 2419.
273 // NIM A 523 (2004) 275.
274 // kB = 0.022 g/cm^2/MeV; rho = 1.396 g/cm^3;
275 // ATLAS Efield = 10 kV/cm provide the strongest effect
276 g4MatNames.push_back("G4_lAr");
277 g4MatData.push_back(0.1576*mm/MeV);
278
279 //G4_BARIUM_FLUORIDE
280 //G4_CESIUM_IODIDE
281 //G4_GEL_PHOTO_EMULSION
282 //G4_PHOTO_EMULSION
283 //G4_PLASTIC_SC_VINYLTOLUENE
284 //G4_SODIUM_IODIDE
285 //G4_STILBENE
286 //G4_lAr
287 //G4_PbWO4
288 //G4_Lucite
289
290 nG4Birks = g4MatData.size();
291}
292
293//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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