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25 //
26 //
27 // -------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4EmSaturation
33 //
34 // Author: Vladimir Ivanchenko
35 //
36 // Creation date: 18.02.2008
37 //
38 // Modifications:
39 //
40 // -------------------------------------------
41
42 //....oooOO0OOooo........oooOO0OOooo........oo
43 //....oooOO0OOooo........oooOO0OOooo........oo
44
45 #include "G4EmSaturation.hh"
46 #include "G4PhysicalConstants.hh"
47 #include "G4SystemOfUnits.hh"
48 #include "G4LossTableManager.hh"
49 #include "G4NistManager.hh"
50 #include "G4Material.hh"
51 #include "G4MaterialCutsCouple.hh"
52 #include "G4ParticleTable.hh"
53
54 //....oooOO0OOooo........oooOO0OOooo........oo
55
56 std::size_t G4EmSaturation::nMaterials = 0;
57 std::vector<G4double> G4EmSaturation::massFact
58 std::vector<G4double> G4EmSaturation::effCharg
59 std::vector<G4double> G4EmSaturation::g4MatDat
60 std::vector<G4String> G4EmSaturation::g4MatNam
61
62 G4EmSaturation::G4EmSaturation(G4int verb)
63 {
64 verbose = verb;
65 nWarnings = nG4Birks = 0;
66
67 electron = nullptr;
68 proton = nullptr;
69 nist = G4NistManager::Instance();
70 InitialiseG4Saturation();
71 }
72
73 //....oooOO0OOooo........oooOO0OOooo........oo
74
75 G4EmSaturation::~G4EmSaturation() = default;
76
77 //....oooOO0OOooo........oooOO0OOooo........oo
78
79 G4double G4EmSaturation::VisibleEnergyDepositi
80 const G4
81 const G4
82 G4double
83 G4double
84 G4double
85 {
86 // no energy deposition
87 if(edep <= 0.0) { return 0.0; }
88
89 // zero step length may happens only if step
90 // is applied, in that case saturation shoul
91 if(length <= 0.0) { return edep; }
92
93 G4double evis = edep;
94 G4double bfactor = couple->GetMaterial()->Ge
95
96 if(bfactor > 0.0) {
97
98 // atomic relaxations for gamma incident
99 if(22 == p->GetPDGEncoding()) {
100 //G4cout << "%% gamma edep= " << edep/ke
101 evis /= (1.0 + bfactor*edep/
102 G4LossTableManager::Instance()->GetRan
103
104 // energy loss
105 } else {
106
107 // protections
108 G4double nloss = std::max(niel, 0.0);
109 G4double eloss = edep - nloss;
110
111 // neutrons and neutral hadrons
112 if(0.0 == p->GetPDGCharge() || eloss < 0
113 nloss = edep;
114 eloss = 0.0;
115 } else {
116
117 // continues energy loss
118 eloss /= (1.0 + bfactor*eloss/length);
119 }
120 // non-ionizing energy loss
121 if(nloss > 0.0) {
122 std::size_t idx = couple->GetMaterial(
123 G4double escaled = nloss*massFactors[i
124 /*
125 G4cout << "%% p edep= " << nloss/keV <
126 << escaled << " MeV in " << co
127 << " " << p->GetParticleName()
128 << G4endl;
129 G4cout << proton->GetParticleName() << G4end
130 */
131 G4double range = G4LossTableManager::I
132 ->GetRange(proton,escaled,couple)/ef
133 nloss /= (1.0 + bfactor*nloss/range);
134 }
135 evis = eloss + nloss;
136 }
137 }
138 return evis;
139 }
140
141 //....oooOO0OOooo........oooOO0OOooo........oo
142
143 void G4EmSaturation::InitialiseG4Saturation()
144 {
145 if(nMaterials == G4Material::GetNumberOfMate
146 nMaterials = G4Material::GetNumberOfMaterial
147 massFactors.resize(nMaterials, 1.0);
148 effCharges.resize(nMaterials, 1.0);
149
150 if(0 == nG4Birks) { InitialiseG4materials()
151
152 for(std::size_t i=0; i<nMaterials; ++i) {
153 InitialiseBirksCoefficient((*G4Material::G
154 }
155 if(verbose > 0) { DumpBirksCoefficients(); }
156 }
157
158 //....oooOO0OOooo........oooOO0OOooo........oo
159
160 G4double G4EmSaturation::FindG4BirksCoefficien
161 {
162 if(0 == nG4Birks) { InitialiseG4materials()
163
164 G4String name = mat->GetName();
165 // is this material in the vector?
166
167 for(G4int j=0; j<nG4Birks; ++j) {
168 if(name == g4MatNames[j]) {
169 if(verbose > 0)
170 G4cout << "### G4EmSaturation::FindG4B
171 << name << " is " << g4MatData[
172 << G4endl;
173 return g4MatData[j];
174 }
175 }
176 return 0.0;
177 }
178
179 //....oooOO0OOooo........oooOO0OOooo........oo
180
181 void G4EmSaturation::InitialiseBirksCoefficien
182 {
183 // electron and proton should exist in any c
184 if(nullptr == electron) {
185 electron = G4ParticleTable::GetParticleTab
186 proton = G4ParticleTable::GetParticleTable
187 if(nullptr == electron) {
188 G4Exception("G4EmSaturation::InitialiseB
189 FatalException, "electron should exist")
190 }
191 }
192
193 G4double curBirks = mat->GetIonisation()->Ge
194
195 G4String name = mat->GetName();
196
197 // material has no Birks coeffitient defined
198 // seach in the Geant4 list
199 if(curBirks == 0.0) {
200 for(G4int j=0; j<nG4Birks; ++j) {
201 if(name == g4MatNames[j]) {
202 mat->GetIonisation()->SetBirksConstant
203 curBirks = g4MatData[j];
204 break;
205 }
206 }
207 }
208
209 if(curBirks == 0.0) { return; }
210
211 // compute mean mass ratio
212 G4double curRatio = 0.0;
213 G4double curChargeSq = 0.0;
214 G4double norm = 0.0;
215 const G4ElementVector* theElementVector = ma
216 const G4double* theAtomNumDensityVector = ma
217 std::size_t nelm = mat->GetNumberOfElements(
218 for (std::size_t i=0; i<nelm; ++i) {
219 const G4Element* elm = (*theElementVector)
220 G4int Z = elm->GetZasInt();
221 G4double w = theAtomNumDensityVector[i];
222 curRatio += w/nist->GetAtomicMassAmu(Z);
223 curChargeSq += (Z*Z)*w;
224 norm += w;
225 }
226 if ( norm > 0.0) { norm = 1.0/norm; }
227 curRatio *= (CLHEP::proton_mass_c2*norm);
228 curChargeSq *= norm;
229
230 // store results
231 std::size_t idx = mat->GetIndex();
232 massFactors[idx] = curRatio;
233 effCharges[idx] = curChargeSq;
234 }
235
236 //....oooOO0OOooo........oooOO0OOooo........oo
237
238 void G4EmSaturation::DumpBirksCoefficients()
239 {
240 G4cout << "### Birks coefficients used in ru
241 const G4MaterialTable* mtable = G4Material::
242 for(std::size_t i=0; i<nMaterials; ++i) {
243 const G4Material* mat = (*mtable)[i];
244 G4double br = mat->GetIonisation()->GetBir
245 if(br > 0.0) {
246 G4cout << " " << mat->GetName() << "
247 << br*MeV/mm << " mm/MeV" << " "
248 << br*mat->GetDensity()*MeV*cm2/g
249 << " g/cm^2/MeV massFactor= " << mass
250 << " effCharge= " << effCharges[i] << G
251 }
252 }
253 }
254
255 //....oooOO0OOooo........oooOO0OOooo........oo
256
257 void G4EmSaturation::DumpG4BirksCoefficients()
258 {
259 if(nG4Birks > 0) {
260 G4cout << "### Birks coefficients for Gean
261 for(G4int i=0; i<nG4Birks; ++i) {
262 G4cout << " " << g4MatNames[i] << "
263 << g4MatData[i]*MeV/mm << " mm/Me
264 }
265 }
266 }
267
268 //....oooOO0OOooo........oooOO0OOooo........oo
269
270 void G4EmSaturation::InitialiseG4materials()
271 {
272 nG4Birks = 4;
273 g4MatData.reserve(nG4Birks);
274
275 // M.Hirschberg et al., IEEE Trans. Nuc. Sci
276 // SCSN-38 kB = 0.00842 g/cm^2/MeV; rho = 1.
277 g4MatNames.push_back("G4_POLYSTYRENE");
278 g4MatData.push_back(0.07943*mm/MeV);
279
280 // C.Fabjan (private communication)
281 // kB = 0.006 g/cm^2/MeV; rho = 7.13 g/cm^3
282 g4MatNames.push_back("G4_BGO");
283 g4MatData.push_back(0.008415*mm/MeV);
284
285 // A.Ribon analysis of publications
286 // Scallettar et al., Phys. Rev. A25 (1982)
287 // NIM A 523 (2004) 275.
288 // kB = 0.022 g/cm^2/MeV; rho = 1.396 g/cm^3
289 // ATLAS Efield = 10 kV/cm provide the stron
290 // kB = 0.1576*mm/MeV
291 // A. Kiryunin and P.Strizenec "Geant4 hadro
292 // working group meeting " kB = 0.041/9.13 g
293 g4MatNames.push_back("G4_lAr");
294 g4MatData.push_back(0.032*mm/MeV);
295
296 //G4_BARIUM_FLUORIDE
297 //G4_CESIUM_IODIDE
298 //G4_GEL_PHOTO_EMULSION
299 //G4_PHOTO_EMULSION
300 //G4_PLASTIC_SC_VINYLTOLUENE
301 //G4_SODIUM_IODIDE
302 //G4_STILBENE
303 //G4_lAr
304
305 //G4_PbWO4 - CMS value
306 g4MatNames.push_back("G4_PbWO4");
307 g4MatData.push_back(0.0333333*mm/MeV);
308
309 //G4_Lucite
310
311 }
312
313 //....oooOO0OOooo........oooOO0OOooo........oo
314