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25 // 25 //
>> 26 // $Id$
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" <<
59 #include "G4ProductionCutsTable.hh" 68 #include "G4ProductionCutsTable.hh"
60 #include "G4NucleiProperties.hh" 69 #include "G4NucleiProperties.hh"
61 #include "G4Pow.hh" 70 #include "G4Pow.hh"
>> 71 #include "G4LossTableManager.hh"
>> 72 #include "G4LossTableBuilder.hh"
62 #include "G4NistManager.hh" 73 #include "G4NistManager.hh"
63 74
64 //....oooOO0OOooo........oooOO0OOooo........oo 75 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 76
66 using namespace std; 77 using namespace std;
67 78
68 G4eCoulombScatteringModel::G4eCoulombScatterin << 79 G4eCoulombScatteringModel::G4eCoulombScatteringModel(const G4String& nam)
69 : G4VEmModel("eCoulombScattering"), isCombin << 80 : G4VEmModel(nam),
>> 81 cosThetaMin(1.0),
>> 82 cosThetaMax(-1.0),
>> 83 isInitialised(false)
70 { 84 {
>> 85 fParticleChange = 0;
71 fNistManager = G4NistManager::Instance(); 86 fNistManager = G4NistManager::Instance();
72 theIonTable = G4ParticleTable::GetParticleT << 87 theParticleTable = G4ParticleTable::GetParticleTable();
73 theProton = G4Proton::Proton(); << 88 theProton = G4Proton::Proton();
>> 89 currentMaterial = 0;
74 90
75 wokvi = new G4WentzelOKandVIxSection(isCombi << 91 pCuts = 0;
76 92
77 mass = CLHEP::proton_mass_c2; << 93 lowEnergyThreshold = 1*keV; // particle will be killed for lower energy
>> 94 recoilThreshold = 0.*keV; // by default does not work
>> 95
>> 96 particle = 0;
>> 97 currentCouple = 0;
>> 98 wokvi = new G4WentzelOKandVIxSection();
>> 99
>> 100 currentMaterialIndex = 0;
>> 101
>> 102 cosTetMinNuc = 1.0;
>> 103 cosTetMaxNuc = -1.0;
>> 104 elecRatio = 0.0;
>> 105 mass = proton_mass_c2;
78 } 106 }
79 107
80 //....oooOO0OOooo........oooOO0OOooo........oo 108 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 109
82 G4eCoulombScatteringModel::~G4eCoulombScatteri 110 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
83 { 111 {
84 delete wokvi; 112 delete wokvi;
85 } 113 }
86 114
87 //....oooOO0OOooo........oooOO0OOooo........oo 115 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 116
89 void G4eCoulombScatteringModel::Initialise(con << 117 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
90 const G4DataVector& cuts) 118 const G4DataVector& cuts)
91 { 119 {
92 SetupParticle(part); << 120 SetupParticle(p);
93 currentCouple = nullptr; << 121 currentCouple = 0;
94 << 122 cosThetaMin = cos(PolarAngleLimit());
95 G4double tet = PolarAngleLimit(); << 123 wokvi->Initialise(p, cosThetaMin);
96 << 124 /*
97 // defined theta limit between single and mu << 125 G4cout << "G4eCoulombScatteringModel: " << particle->GetParticleName()
98 if(isCombined) { << 126 << " 1-cos(ThetaLimit)= " << 1 - cosThetaMin
99 if(tet >= CLHEP::pi) { cosThetaMin = -1.0; << 127 << " cos(thetaMax)= " << cosThetaMax
100 else if(tet > 0.0) { cosThetaMin = std::co << 128 << G4endl;
101 << 129 */
102 // single scattering without multiple << 130 pCuts = G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
103 } else if(tet > 0.0) { <<
104 cosThetaMin = std::cos(std::min(tet, CLHEP <<
105 } <<
106 <<
107 wokvi->Initialise(part, cosThetaMin); <<
108 pCuts = &cuts; <<
109 /* 131 /*
110 G4cout << "G4eCoulombScatteringModel::Initia << 132 G4cout << "!!! G4eCoulombScatteringModel::Initialise for "
111 << part->GetParticleName() << " 1-cos(Tet << 133 << p->GetParticleName() << " cos(TetMin)= " << cosThetaMin
112 << " 1-cos(TetMax)= " << 1. - cosThetaMax << 134 << " cos(TetMax)= " << cosThetaMax <<G4endl;
113 G4cout << "cut[0]= " << (*pCuts)[0] << G4end << 135 G4cout << "cut0= " << cuts[0] << " cut1= " << cuts[1] << G4endl;
114 */ 136 */
115 if(nullptr == fParticleChange) { << 137 if(!isInitialised) {
>> 138 isInitialised = true;
116 fParticleChange = GetParticleChangeForGamm 139 fParticleChange = GetParticleChangeForGamma();
117 } 140 }
118 if(IsMaster() && mass < GeV && part->GetPart << 141 if(mass < GeV) {
119 InitialiseElementSelectors(part, cuts); << 142 InitialiseElementSelectors(p,cuts);
120 } <<
121 } <<
122 <<
123 //....oooOO0OOooo........oooOO0OOooo........oo <<
124 <<
125 void G4eCoulombScatteringModel::InitialiseLoca <<
126 G4VEmModel* masterModel) <<
127 { <<
128 SetElementSelectors(masterModel->GetElementS <<
129 } <<
130 <<
131 //....oooOO0OOooo........oooOO0OOooo........oo <<
132 <<
133 G4double <<
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co <<
135 const G4ParticleDefinition* part <<
136 G4double) <<
137 { <<
138 SetupParticle(part); <<
139 <<
140 // define cut using cuts for proton <<
141 G4double cut = <<
142 std::max(recoilThreshold, (*pCuts)[Current <<
143 <<
144 // find out lightest element <<
145 const G4ElementVector* theElementVector = ma <<
146 std::size_t nelm = material->GetNumberOfElem <<
147 <<
148 // select lightest element <<
149 G4int Z = 300; <<
150 for (std::size_t j=0; j<nelm; ++j) { <<
151 Z = std::min(Z,(*theElementVector)[j]->Get <<
152 } 143 }
153 G4int A = G4lrint(fNistManager->GetAtomicMas <<
154 G4double targetMass = G4NucleiProperties::Ge <<
155 G4double t = std::max(cut, 0.5*(cut + sqrt(2 <<
156 <<
157 return t; <<
158 } 144 }
159 145
160 //....oooOO0OOooo........oooOO0OOooo........oo 146 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
161 147
162 G4double G4eCoulombScatteringModel::ComputeCro 148 G4double G4eCoulombScatteringModel::ComputeCrossSectionPerAtom(
163 const G4ParticleDefinition* p, 149 const G4ParticleDefinition* p,
164 G4double kinEnergy, 150 G4double kinEnergy,
165 G4double Z, G4double, 151 G4double Z, G4double,
166 G4double cutEnergy, G4double) 152 G4double cutEnergy, G4double)
167 { 153 {
168 /* << 154 //G4cout << "### G4eCoulombScatteringModel::ComputeCrossSectionPerAtom for "
169 G4cout << "### G4eCoulombScatteringModel::Co << 155 // << p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
170 << p->GetParticleName()<<" Z= "<<Z<<" e(MeV <<
171 << G4endl; <<
172 */ <<
173 G4double cross = 0.0; 156 G4double cross = 0.0;
174 elecRatio = 0.0; <<
175 if(p != particle) { SetupParticle(p); } 157 if(p != particle) { SetupParticle(p); }
176 158
177 // cross section is set to zero to avoid pro 159 // cross section is set to zero to avoid problems in sample secondary
178 if(kinEnergy <= 0.0) { return cross; } 160 if(kinEnergy <= 0.0) { return cross; }
179 DefineMaterial(CurrentCouple()); 161 DefineMaterial(CurrentCouple());
180 G4double costmin = wokvi->SetupKinematic(kin << 162 cosTetMinNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial);
181 << 163 if(cosThetaMax < cosTetMinNuc) {
182 //G4cout << "cosThetaMax= "<<cosThetaMax<<" << 164 G4int iz = G4int(Z);
183 << 165 cosTetMinNuc = wokvi->SetupTarget(iz, cutEnergy);
184 if(cosThetaMax < costmin) { << 166 cosTetMaxNuc = cosThetaMax;
185 G4int iz = G4lrint(Z); << 167 if(iz == 1 && cosTetMaxNuc < 0.0 && particle == theProton) {
186 G4double cut = (0.0 < fixedCut) ? fixedCut << 168 cosTetMaxNuc = 0.0;
187 costmin = wokvi->SetupTarget(iz, cut); <<
188 //G4cout << "SetupTarget: Z= " << iz << " <<
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 } 169 }
196 /* << 170 cross = wokvi->ComputeNuclearCrossSection(cosTetMinNuc, cosTetMaxNuc);
197 if(p->GetParticleName() == "e-") << 171 elecRatio = wokvi->ComputeElectronCrossSection(cosTetMinNuc, cosThetaMax);
198 G4cout << "Z= " << Z << " e(MeV)= " << kin << 172 cross += elecRatio;
199 << " cross(b)= " << cross/barn << " 1-cos << 173 if(cross > 0.0) { elecRatio /= cross; }
200 << " 1-costmax= " << 1-costmax <<
201 << " 1-cosThetaMax= " << 1-cosThetaMax <<
202 << " " << currentMaterial->GetName() <<
203 << G4endl; <<
204 */ <<
205 } 174 }
206 //G4cout << "====== cross= " << cross << G4e << 175 /*
>> 176 if(p->GetParticleName() == "e-")
>> 177 G4cout << "e(MeV)= " << kinEnergy/MeV << " cross(b)= " << cross/barn
>> 178 << " 1-cosTetMinNuc= " << 1-cosTetMinNuc
>> 179 << " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc
>> 180 << G4endl;
>> 181 */
207 return cross; 182 return cross;
208 } 183 }
209 184
210 //....oooOO0OOooo........oooOO0OOooo........oo 185 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211 186
212 void G4eCoulombScatteringModel::SampleSecondar 187 void G4eCoulombScatteringModel::SampleSecondaries(
213 std::vector<G4DynamicParticle* 188 std::vector<G4DynamicParticle*>* fvect,
214 const G4MaterialCutsCouple* couple, 189 const G4MaterialCutsCouple* couple,
215 const G4DynamicParticle* dp, 190 const G4DynamicParticle* dp,
216 G4double cutEnergy, 191 G4double cutEnergy,
217 G4double) 192 G4double)
218 { 193 {
219 G4double kinEnergy = dp->GetKineticEnergy(); 194 G4double kinEnergy = dp->GetKineticEnergy();
>> 195
>> 196 // absorb particle below low-energy limit to avoid situation
>> 197 // when a particle has no energy loss
>> 198 if(kinEnergy < lowEnergyThreshold) {
>> 199 fParticleChange->SetProposedKineticEnergy(0.0);
>> 200 fParticleChange->ProposeLocalEnergyDeposit(kinEnergy);
>> 201 fParticleChange->ProposeNonIonizingEnergyDeposit(kinEnergy);
>> 202 return;
>> 203 }
220 SetupParticle(dp->GetDefinition()); 204 SetupParticle(dp->GetDefinition());
221 DefineMaterial(couple); 205 DefineMaterial(couple);
222 /* 206 /*
223 G4cout << "G4eCoulombScatteringModel::Sample 207 G4cout << "G4eCoulombScatteringModel::SampleSecondaries e(MeV)= "
224 << kinEnergy << " " << particle->GetPart 208 << kinEnergy << " " << particle->GetParticleName()
225 << " cut= " << cutEnergy<< G4endl; 209 << " cut= " << cutEnergy<< G4endl;
226 */ 210 */
227 // Choose nucleus 211 // Choose nucleus
228 G4double cut = (0.0 < fixedCut) ? fixedCut : << 212 const G4Element* currentElement =
>> 213 SelectRandomAtom(couple,particle,kinEnergy,cutEnergy,kinEnergy);
229 214
230 wokvi->SetupKinematic(kinEnergy, currentMate << 215 G4double Z = currentElement->GetZ();
231 216
232 const G4Element* currentElement = SelectTarg << 217 if(ComputeCrossSectionPerAtom(particle,kinEnergy, Z,
233 dp->Get << 218 kinEnergy, cutEnergy, kinEnergy) == 0.0)
234 G4int iz = currentElement->GetZasInt(); << 219 { return; }
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); <<
244 220
>> 221 G4int iz = G4int(Z);
245 G4int ia = SelectIsotopeNumber(currentElemen 222 G4int ia = SelectIsotopeNumber(currentElement);
246 G4double targetMass = G4NucleiProperties::Ge 223 G4double targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
247 wokvi->SetTargetMass(targetMass); 224 wokvi->SetTargetMass(targetMass);
248 225
249 G4ThreeVector newDirection = 226 G4ThreeVector newDirection =
250 wokvi->SampleSingleScattering(costmin, cos << 227 wokvi->SampleSingleScattering(cosTetMinNuc, cosThetaMax, elecRatio);
251 G4double cost = newDirection.z(); 228 G4double cost = newDirection.z();
252 /* << 229
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 230 G4ThreeVector direction = dp->GetMomentumDirection();
261 newDirection.rotateUz(direction); 231 newDirection.rotateUz(direction);
262 232
263 fParticleChange->ProposeMomentumDirection(ne 233 fParticleChange->ProposeMomentumDirection(newDirection);
264 234
265 // recoil sampling assuming a small recoil 235 // recoil sampling assuming a small recoil
266 // and first order correction to primary 4-m 236 // and first order correction to primary 4-momentum
267 G4double mom2 = wokvi->GetMomentumSquare(); 237 G4double mom2 = wokvi->GetMomentumSquare();
268 G4double trec = mom2*(1.0 - cost) << 238 G4double trec = mom2*(1.0 - cost)/(targetMass + (mass + kinEnergy)*(1.0 - cost));
269 /(targetMass + (mass + kinEnergy)*(1.0 - c <<
270 <<
271 // the check likely not needed <<
272 trec = std::min(trec, kinEnergy); <<
273 G4double finalT = kinEnergy - trec; 239 G4double finalT = kinEnergy - trec;
274 G4double edep = 0.0; << 240 //G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "<<trec<<G4endl;
275 /* << 241 if(finalT <= lowEnergyThreshold) {
276 G4cout<<"G4eCoulombScatteringModel: finalT << 242 trec = kinEnergy;
277 <<trec << " Z= " << iz << " A= " << ia << 243 finalT = 0.0;
278 << " tcut(keV)= " << (*pCuts)[currentMater << 244 }
279 */ << 245
>> 246 fParticleChange->SetProposedKineticEnergy(finalT);
280 G4double tcut = recoilThreshold; 247 G4double tcut = recoilThreshold;
281 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur 248 if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
282 249
283 if(trec > tcut) { 250 if(trec > tcut) {
284 G4ParticleDefinition* ion = theIonTable->G << 251 G4ParticleDefinition* ion = theParticleTable->GetIon(iz, ia, 0.0);
285 G4ThreeVector dir = (direction*sqrt(mom2) 252 G4ThreeVector dir = (direction*sqrt(mom2) -
286 newDirection*sqrt(finalT*(2*mass + fina 253 newDirection*sqrt(finalT*(2*mass + finalT))).unit();
287 auto newdp = new G4DynamicParticle(ion, di << 254 G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
288 fvect->push_back(newdp); 255 fvect->push_back(newdp);
289 } else { 256 } else {
290 edep = trec; << 257 fParticleChange->ProposeLocalEnergyDeposit(trec);
291 fParticleChange->ProposeNonIonizingEnergyD << 258 fParticleChange->ProposeNonIonizingEnergyDeposit(trec);
292 } 259 }
293 << 260
294 // finelize primary energy and energy bala << 261 return;
295 // this threshold may be applied only beca <<
296 // e+e- msc model is applied <<
297 if(finalT < 0.0) { <<
298 edep += finalT; <<
299 finalT = 0.0; <<
300 } <<
301 edep = std::max(edep, 0.0); <<
302 fParticleChange->SetProposedKineticEnergy(fi <<
303 fParticleChange->ProposeLocalEnergyDeposit(e <<
304 } 262 }
305 263
306 //....oooOO0OOooo........oooOO0OOooo........oo 264 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 265
>> 266
307 267