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>> 26 // $Id: G4eCoulombScatteringModel.cc 79188 2014-02-20 09:22:48Z gcosmo $
26 // 27 //
27 // ------------------------------------------- 28 // -------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // 32 //
32 // File name: G4eCoulombScatteringModel 33 // File name: G4eCoulombScatteringModel
33 // 34 //
34 // Author: Vladimir Ivanchenko 35 // Author: Vladimir Ivanchenko
35 // 36 //
36 // Creation date: 22.08.2005 37 // Creation date: 22.08.2005
37 // 38 //
38 // Modifications: V.Ivanchenko << 39 // Modifications:
39 // 40 //
>> 41 // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
>> 42 // logic of building - only elements from G4ElementTable
>> 43 // 08.08.06 V.Ivanchenko build internal table in ekin scale, introduce faclim
>> 44 // 19.08.06 V.Ivanchenko add inline function ScreeningParameter
>> 45 // 09.10.07 V.Ivanchenko reorganized methods, add cut dependence in scattering off e-
>> 46 // 09.06.08 V.Ivanchenko add SelectIsotope and sampling of the recoil ion
>> 47 // 16.06.09 C.Consolandi fixed computation of effective mass
>> 48 // 27.05.10 V.Ivanchenko added G4WentzelOKandVIxSection class to
>> 49 // compute cross sections and sample scattering angle
40 // 50 //
41 // 51 //
42 // Class Description: 52 // Class Description:
43 // 53 //
44 // ------------------------------------------- 54 // -------------------------------------------------------------------
45 // 55 //
46 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 //....oooOO0OOooo........oooOO0OOooo........oo 57 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48 58
49 #include "G4eCoulombScatteringModel.hh" 59 #include "G4eCoulombScatteringModel.hh"
50 #include "G4PhysicalConstants.hh" 60 #include "G4PhysicalConstants.hh"
51 #include "G4SystemOfUnits.hh" 61 #include "G4SystemOfUnits.hh"
52 #include "Randomize.hh" 62 #include "Randomize.hh"
53 #include "G4DataVector.hh" 63 #include "G4DataVector.hh"
54 #include "G4ElementTable.hh" 64 #include "G4ElementTable.hh"
55 #include "G4ParticleChangeForGamma.hh" 65 #include "G4ParticleChangeForGamma.hh"
56 #include "G4Proton.hh" 66 #include "G4Proton.hh"
57 #include "G4ParticleTable.hh" 67 #include "G4ParticleTable.hh"
58 #include "G4IonTable.hh" 68 #include "G4IonTable.hh"
59 #include "G4ProductionCutsTable.hh" 69 #include "G4ProductionCutsTable.hh"
60 #include "G4NucleiProperties.hh" 70 #include "G4NucleiProperties.hh"
61 #include "G4Pow.hh" 71 #include "G4Pow.hh"
>> 72 #include "G4LossTableManager.hh"
>> 73 #include "G4LossTableBuilder.hh"
62 #include "G4NistManager.hh" 74 #include "G4NistManager.hh"
63 75
64 //....oooOO0OOooo........oooOO0OOooo........oo 76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 77
66 using namespace std; 78 using namespace std;
67 79
68 G4eCoulombScatteringModel::G4eCoulombScatterin << 80 G4eCoulombScatteringModel::G4eCoulombScatteringModel(const G4String& nam)
69 : G4VEmModel("eCoulombScattering"), isCombin << 81 : G4VEmModel(nam),
>> 82 cosThetaMin(1.0),
>> 83 cosThetaMax(-1.0),
>> 84 isInitialised(false)
70 { 85 {
>> 86 fParticleChange = 0;
71 fNistManager = G4NistManager::Instance(); 87 fNistManager = G4NistManager::Instance();
72 theIonTable = G4ParticleTable::GetParticleT 88 theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
73 theProton = G4Proton::Proton(); 89 theProton = G4Proton::Proton();
>> 90 currentMaterial = 0;
>> 91 fixedCut = -1.0;
74 92
75 wokvi = new G4WentzelOKandVIxSection(isCombi << 93 pCuts = 0;
76 94
77 mass = CLHEP::proton_mass_c2; << 95 lowEnergyThreshold = 1*keV; // particle will be killed for lower energy
>> 96 recoilThreshold = 0.*keV; // by default does not work
>> 97
>> 98 particle = 0;
>> 99 currentCouple = 0;
>> 100 wokvi = new G4WentzelOKandVIxSection();
>> 101
>> 102 currentMaterialIndex = 0;
>> 103
>> 104 cosTetMinNuc = 1.0;
>> 105 cosTetMaxNuc = -1.0;
>> 106 elecRatio = 0.0;
>> 107 mass = proton_mass_c2;
78 } 108 }
79 109
80 //....oooOO0OOooo........oooOO0OOooo........oo 110 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 111
82 G4eCoulombScatteringModel::~G4eCoulombScatteri 112 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
83 { 113 {
84 delete wokvi; 114 delete wokvi;
85 } 115 }
86 116
87 //....oooOO0OOooo........oooOO0OOooo........oo 117 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 118
89 void G4eCoulombScatteringModel::Initialise(con 119 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* part,
90 const G4DataVector& cuts) 120 const G4DataVector& cuts)
91 { 121 {
92 SetupParticle(part); 122 SetupParticle(part);
93 currentCouple = nullptr; << 123 currentCouple = 0;
94 << 124 cosThetaMin = cos(PolarAngleLimit());
95 G4double tet = PolarAngleLimit(); <<
96 <<
97 // defined theta limit between single and mu <<
98 if(isCombined) { <<
99 if(tet >= CLHEP::pi) { cosThetaMin = -1.0; <<
100 else if(tet > 0.0) { cosThetaMin = std::co <<
101 <<
102 // single scattering without multiple <<
103 } else if(tet > 0.0) { <<
104 cosThetaMin = std::cos(std::min(tet, CLHEP <<
105 } <<
106 <<
107 wokvi->Initialise(part, cosThetaMin); 125 wokvi->Initialise(part, cosThetaMin);
>> 126 /*
>> 127 G4cout << "G4eCoulombScatteringModel: " << particle->GetParticleName()
>> 128 << " 1-cos(ThetaLimit)= " << 1 - cosThetaMin
>> 129 << " cos(thetaMax)= " << cosThetaMax
>> 130 << G4endl;
>> 131 */
108 pCuts = &cuts; 132 pCuts = &cuts;
>> 133 // G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
109 /* 134 /*
110 G4cout << "G4eCoulombScatteringModel::Initia << 135 G4cout << "!!! G4eCoulombScatteringModel::Initialise for "
111 << part->GetParticleName() << " 1-cos(Tet << 136 << part->GetParticleName() << " cos(TetMin)= " << cosThetaMin
112 << " 1-cos(TetMax)= " << 1. - cosThetaMax << 137 << " cos(TetMax)= " << cosThetaMax <<G4endl;
113 G4cout << "cut[0]= " << (*pCuts)[0] << G4end << 138 G4cout << "cut= " << pCuts[0] << " cut1= " << pCuts[1] << G4endl;
114 */ 139 */
115 if(nullptr == fParticleChange) { << 140 if(!isInitialised) {
>> 141 isInitialised = true;
116 fParticleChange = GetParticleChangeForGamm 142 fParticleChange = GetParticleChangeForGamma();
117 } 143 }
118 if(IsMaster() && mass < GeV && part->GetPart 144 if(IsMaster() && mass < GeV && part->GetParticleName() != "GenericIon") {
119 InitialiseElementSelectors(part, cuts); << 145 InitialiseElementSelectors(part,cuts);
120 } 146 }
121 } 147 }
122 148
123 //....oooOO0OOooo........oooOO0OOooo........oo 149 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
124 150
125 void G4eCoulombScatteringModel::InitialiseLoca 151 void G4eCoulombScatteringModel::InitialiseLocal(const G4ParticleDefinition*,
126 G4VEmModel* masterModel) 152 G4VEmModel* masterModel)
127 { 153 {
128 SetElementSelectors(masterModel->GetElementS 154 SetElementSelectors(masterModel->GetElementSelectors());
129 } 155 }
130 156
131 //....oooOO0OOooo........oooOO0OOooo........oo 157 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
132 158
133 G4double 159 G4double
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co 160 G4eCoulombScatteringModel::MinPrimaryEnergy(const G4Material* material,
135 const G4ParticleDefinition* part 161 const G4ParticleDefinition* part,
136 G4double) 162 G4double)
137 { 163 {
138 SetupParticle(part); 164 SetupParticle(part);
139 165
140 // define cut using cuts for proton 166 // define cut using cuts for proton
141 G4double cut = 167 G4double cut =
142 std::max(recoilThreshold, (*pCuts)[Current 168 std::max(recoilThreshold, (*pCuts)[CurrentCouple()->GetIndex()]);
143 169
144 // find out lightest element 170 // find out lightest element
145 const G4ElementVector* theElementVector = ma 171 const G4ElementVector* theElementVector = material->GetElementVector();
146 std::size_t nelm = material->GetNumberOfElem << 172 G4int nelm = material->GetNumberOfElements();
147 <<
148 // select lightest element <<
149 G4int Z = 300; 173 G4int Z = 300;
150 for (std::size_t j=0; j<nelm; ++j) { << 174 for (G4int j=0; j<nelm; ++j) {
151 Z = std::min(Z,(*theElementVector)[j]->Get << 175 G4int iz = (G4int)(*theElementVector)[j]->GetZ();
>> 176 if(iz < Z) { Z = iz; }
152 } 177 }
153 G4int A = G4lrint(fNistManager->GetAtomicMas 178 G4int A = G4lrint(fNistManager->GetAtomicMassAmu(Z));
154 G4double targetMass = G4NucleiProperties::Ge 179 G4double targetMass = G4NucleiProperties::GetNuclearMass(A, Z);
155 G4double t = std::max(cut, 0.5*(cut + sqrt(2 180 G4double t = std::max(cut, 0.5*(cut + sqrt(2*cut*targetMass)));
156 181
157 return t; << 182 return std::max(lowEnergyThreshold, t);
158 } 183 }
159 184
160 //....oooOO0OOooo........oooOO0OOooo........oo 185 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
161 186
162 G4double G4eCoulombScatteringModel::ComputeCro 187 G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
163 const G4ParticleDefinition* p, 188 const G4ParticleDefinition* p,
164 G4double kinEnergy, 189 G4double kinEnergy,
165 G4double Z, G4double, 190 G4double Z, G4double,
166 G4double cutEnergy, G4double) 191 G4double cutEnergy, G4double)
167 { 192 {
168 /* << 193 //G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom for "
169 G4cout << "### G4eCoulombScatteringModel::Co << 194 //<< p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
170 << p->GetParticleName()<<" Z= "<<Z<<" e(MeV <<
171 << G4endl; <<
172 */ <<
173 G4double cross = 0.0; 195 G4double cross = 0.0;
174 elecRatio = 0.0; <<
175 if(p != particle) { SetupParticle(p); } 196 if(p != particle) { SetupParticle(p); }
176 197
177 // cross section is set to zero to avoid pro 198 // cross section is set to zero to avoid problems in sample secondary
178 if(kinEnergy <= 0.0) { return cross; } 199 if(kinEnergy <= 0.0) { return cross; }
179 DefineMaterial(CurrentCouple()); 200 DefineMaterial(CurrentCouple());
180 G4double costmin = wokvi->SetupKinematic(kin << 201 cosTetMinNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial);
181 << 202 if(cosThetaMax < cosTetMinNuc) {
182 //G4cout << "cosThetaMax= "<<cosThetaMax<<" << 203 G4int iz = G4int(Z);
183 << 204 G4double cut = cutEnergy;
184 if(cosThetaMax < costmin) { << 205 if(fixedCut > 0.0) { cut = fixedCut; }
185 G4int iz = G4lrint(Z); << 206 cosTetMinNuc = wokvi->SetupTarget(iz, cut);
186 G4double cut = (0.0 < fixedCut) ? fixedCut << 207 cosTetMaxNuc = cosThetaMax;
187 costmin = wokvi->SetupTarget(iz, cut); << 208 if(iz == 1 && cosTetMaxNuc < 0.0 && particle == theProton) {
188 //G4cout << "SetupTarget: Z= " << iz << " << 209 cosTetMaxNuc = 0.0;
189 // << costmin << G4endl; <<
190 G4double costmax = (1 == iz && particle == <<
191 ? 0.0 : cosThetaMax; <<
192 if(costmin > costmax) { <<
193 cross = wokvi->ComputeNuclearCrossSectio <<
194 + wokvi->ComputeElectronCrossSection(c <<
195 } 210 }
196 /* << 211 cross = wokvi->ComputeNuclearCrossSection(cosTetMinNuc, cosTetMaxNuc);
197 if(p->GetParticleName() == "e-") << 212 elecRatio = wokvi->ComputeElectronCrossSection(cosTetMinNuc, cosThetaMax);
198 G4cout << "Z= " << Z << " e(MeV)= " << kin << 213 cross += elecRatio;
199 << " cross(b)= " << cross/barn << " 1-cos << 214 if(cross > 0.0) { elecRatio /= cross; }
200 << " 1-costmax= " << 1-costmax <<
201 << " 1-cosThetaMax= " << 1-cosThetaMax <<
202 << " " << currentMaterial->GetName() <<
203 << G4endl; <<
204 */ <<
205 } 215 }
206 //G4cout << "====== cross= " << cross << G4e << 216 /*
>> 217 if(p->GetParticleName() == "e-")
>> 218 G4cout << "e(MeV)= " << kinEnergy/MeV << " cross(b)= " << cross/barn
>> 219 << " 1-cosTetMinNuc= " << 1-cosTetMinNuc
>> 220 << " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc
>> 221 << G4endl;
>> 222 */
207 return cross; 223 return cross;
208 } 224 }
209 225
210 //....oooOO0OOooo........oooOO0OOooo........oo 226 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211 227
212 void G4eCoulombScatteringModel::SampleSecondar 228 void G4eCoulombScatteringModel::SampleSecondaries(
213 std::vector<G4DynamicParticle* 229 std::vector<G4DynamicParticle*>* fvect,
214 const G4MaterialCutsCouple* couple, 230 const G4MaterialCutsCouple* couple,
215 const G4DynamicParticle* dp, 231 const G4DynamicParticle* dp,
216 G4double cutEnergy, 232 G4double cutEnergy,
217 G4double) 233 G4double)
218 { 234 {
219 G4double kinEnergy = dp->GetKineticEnergy(); 235 G4double kinEnergy = dp->GetKineticEnergy();
>> 236
>> 237 // absorb particle below low-energy limit to avoid situation
>> 238 // when a particle has no energy loss
>> 239 if(kinEnergy < lowEnergyThreshold) {
>> 240 fParticleChange->SetProposedKineticEnergy(0.0);
>> 241 fParticleChange->ProposeLocalEnergyDeposit(kinEnergy);
>> 242 fParticleChange->ProposeNonIonizingEnergyDeposit(kinEnergy);
>> 243 return;
>> 244 }
220 SetupParticle(dp->GetDefinition()); 245 SetupParticle(dp->GetDefinition());
221 DefineMaterial(couple); 246 DefineMaterial(couple);
222 /* 247 /*
223 G4cout << "G4eCoulombScatteringModel::Sample 248 G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
224 << kinEnergy << " " << particle->GetPart 249 << kinEnergy << " " << particle->GetParticleName()
225 << " cut= " << cutEnergy<< G4endl; 250 << " cut= " << cutEnergy<< G4endl;
226 */ 251 */
227 // Choose nucleus 252 // Choose nucleus
228 G4double cut = (0.0 < fixedCut) ? fixedCut : << 253 G4double cut = cutEnergy;
>> 254 if(fixedCut > 0.0) { cut = fixedCut; }
229 255
230 wokvi->SetupKinematic(kinEnergy, currentMate << 256 const G4Element* currentElement =
>> 257 SelectRandomAtom(couple,particle,kinEnergy,cut,kinEnergy);
231 258
232 const G4Element* currentElement = SelectTarg << 259 G4double Z = currentElement->GetZ();
233 dp->Get <<
234 G4int iz = currentElement->GetZasInt(); <<
235 <<
236 G4double costmin = wokvi->SetupTarget(iz, cu <<
237 G4double costmax = (1 == iz && particle == t <<
238 ? 0.0 : cosThetaMax; <<
239 if(costmin <= costmax) { return; } <<
240 <<
241 G4double cross = wokvi->ComputeNuclearCrossS <<
242 G4double ecross = wokvi->ComputeElectronCros <<
243 G4double ratio = ecross/(cross + ecross); <<
244 260
>> 261 if(ComputeCrossSectionPerAtom(particle,kinEnergy, Z,
>> 262 kinEnergy, cut, kinEnergy) == 0.0)
>> 263 { return; }
>> 264
>> 265 G4int iz = G4int(Z);
245 G4int ia = SelectIsotopeNumber(currentElemen 266 G4int ia = SelectIsotopeNumber(currentElement);
246 G4double targetMass = G4NucleiProperties::Ge 267 G4double targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
247 wokvi->SetTargetMass(targetMass); 268 wokvi->SetTargetMass(targetMass);
248 269
249 G4ThreeVector newDirection = 270 G4ThreeVector newDirection =
250 wokvi->SampleSingleScattering(costmin, cos << 271 wokvi->SampleSingleScattering(cosTetMinNuc, cosThetaMax, elecRatio);
251 G4double cost = newDirection.z(); 272 G4double cost = newDirection.z();
252 /* << 273
253 G4cout << "SampleSec: e(MeV)= " << kinEn <<
254 << " 1-costmin= " << 1-costmin <<
255 << " 1-costmax= " << 1-costmax <<
256 << " 1-cost= " << 1-cost <<
257 << " ratio= " << ratio <<
258 << G4endl; <<
259 */ <<
260 G4ThreeVector direction = dp->GetMomentumDir 274 G4ThreeVector direction = dp->GetMomentumDirection();
261 newDirection.rotateUz(direction); 275 newDirection.rotateUz(direction);
262 276
263 fParticleChange->ProposeMomentumDirection(ne 277 fParticleChange->ProposeMomentumDirection(newDirection);
264 278
265 // recoil sampling assuming a small recoil 279 // recoil sampling assuming a small recoil
266 // and first order correction to primary 4-m 280 // and first order correction to primary 4-momentum
267 G4double mom2 = wokvi->GetMomentumSquare(); 281 G4double mom2 = wokvi->GetMomentumSquare();
268 G4double trec = mom2*(1.0 - cost) 282 G4double trec = mom2*(1.0 - cost)
269 /(targetMass + (mass + kinEnergy)*(1.0 - c 283 /(targetMass + (mass + kinEnergy)*(1.0 - cost));
270 284
271 // the check likely not needed 285 // the check likely not needed
272 trec = std::min(trec, kinEnergy); << 286 if(trec > kinEnergy) { trec = kinEnergy; }
273 G4double finalT = kinEnergy - trec; 287 G4double finalT = kinEnergy - trec;
274 G4double edep = 0.0; 288 G4double edep = 0.0;
275 /* << 289 //G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "
276 G4cout<<"G4eCoulombScatteringModel: finalT << 290 // <<trec << " Z= " << iz << " A= " << ia<<G4endl;
277 <<trec << " Z= " << iz << " A= " << ia << 291
278 << " tcut(keV)= " << (*pCuts)[currentMater <<
279 */ <<
280 G4double tcut = recoilThreshold; 292 G4double tcut = recoilThreshold;
281 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur 293 if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
282 294
283 if(trec > tcut) { 295 if(trec > tcut) {
284 G4ParticleDefinition* ion = theIonTable->G 296 G4ParticleDefinition* ion = theIonTable->GetIon(iz, ia, 0);
285 G4ThreeVector dir = (direction*sqrt(mom2) 297 G4ThreeVector dir = (direction*sqrt(mom2) -
286 newDirection*sqrt(finalT*(2*mass + fina 298 newDirection*sqrt(finalT*(2*mass + finalT))).unit();
287 auto newdp = new G4DynamicParticle(ion, di << 299 G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
288 fvect->push_back(newdp); 300 fvect->push_back(newdp);
289 } else { 301 } else {
290 edep = trec; 302 edep = trec;
291 fParticleChange->ProposeNonIonizingEnergyD 303 fParticleChange->ProposeNonIonizingEnergyDeposit(edep);
292 } 304 }
293 305
294 // finelize primary energy and energy bala << 306 // finelize primary energy and energy balance
295 // this threshold may be applied only beca << 307 // this threshold may be applied only because for low-enegry
296 // e+e- msc model is applied << 308 // e+e- msc model is applied
297 if(finalT < 0.0) { << 309 if(finalT <= lowEnergyThreshold) {
298 edep += finalT; 310 edep += finalT;
299 finalT = 0.0; 311 finalT = 0.0;
300 } 312 }
301 edep = std::max(edep, 0.0); <<
302 fParticleChange->SetProposedKineticEnergy(fi 313 fParticleChange->SetProposedKineticEnergy(finalT);
303 fParticleChange->ProposeLocalEnergyDeposit(e 314 fParticleChange->ProposeLocalEnergyDeposit(edep);
304 } 315 }
305 316
306 //....oooOO0OOooo........oooOO0OOooo........oo 317 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 318
>> 319
307 320