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25 // 25 //
>> 26 // $Id: G4hCoulombScatteringModel.cc 76536 2013-11-12 15:17:41Z gcosmo $
>> 27 //
26 // ------------------------------------------- 28 // -------------------------------------------------------------------
27 // 29 //
28 // GEANT4 Class file 30 // GEANT4 Class file
29 // 31 //
30 // 32 //
31 // File name: G4hCoulombScatteringModel 33 // File name: G4hCoulombScatteringModel
32 // 34 //
33 // Author: Vladimir Ivanchenko 35 // Author: Vladimir Ivanchenko
34 // 36 //
35 // Creation date: 08.06.2012 from G4eCoulombSc 37 // Creation date: 08.06.2012 from G4eCoulombScatteringModel
36 // 38 //
37 // Modifications: 39 // Modifications:
38 // 40 //
39 // 41 //
40 // Class Description: 42 // Class Description:
41 // 43 //
42 // ------------------------------------------- 44 // -------------------------------------------------------------------
43 // 45 //
44 //....oooOO0OOooo........oooOO0OOooo........oo 46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
45 //....oooOO0OOooo........oooOO0OOooo........oo 47 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
46 48
47 #include "G4hCoulombScatteringModel.hh" 49 #include "G4hCoulombScatteringModel.hh"
48 #include "G4PhysicalConstants.hh" 50 #include "G4PhysicalConstants.hh"
49 #include "G4SystemOfUnits.hh" 51 #include "G4SystemOfUnits.hh"
50 #include "Randomize.hh" 52 #include "Randomize.hh"
51 #include "G4DataVector.hh" 53 #include "G4DataVector.hh"
52 #include "G4ElementTable.hh" 54 #include "G4ElementTable.hh"
53 #include "G4ParticleChangeForGamma.hh" 55 #include "G4ParticleChangeForGamma.hh"
54 #include "G4Proton.hh" 56 #include "G4Proton.hh"
55 #include "G4ParticleTable.hh" 57 #include "G4ParticleTable.hh"
56 #include "G4IonTable.hh" 58 #include "G4IonTable.hh"
57 #include "G4ProductionCutsTable.hh" 59 #include "G4ProductionCutsTable.hh"
58 #include "G4NucleiProperties.hh" 60 #include "G4NucleiProperties.hh"
59 #include "G4Pow.hh" 61 #include "G4Pow.hh"
>> 62 #include "G4LossTableManager.hh"
>> 63 #include "G4LossTableBuilder.hh"
60 #include "G4NistManager.hh" 64 #include "G4NistManager.hh"
61 65
62 //....oooOO0OOooo........oooOO0OOooo........oo 66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 67
64 G4hCoulombScatteringModel::G4hCoulombScatterin << 68 using namespace std;
65 : G4VEmModel("hCoulombScattering"), << 69
>> 70 G4hCoulombScatteringModel::G4hCoulombScatteringModel(const G4String& nam)
>> 71 : G4VEmModel(nam),
66 cosThetaMin(1.0), 72 cosThetaMin(1.0),
67 cosThetaMax(-1.0), 73 cosThetaMax(-1.0),
68 isCombined(combined) << 74 isInitialised(false)
69 { 75 {
70 fParticleChange = nullptr; << 76 fParticleChange = 0;
71 fNistManager = G4NistManager::Instance(); 77 fNistManager = G4NistManager::Instance();
72 theIonTable = G4ParticleTable::GetParticleT << 78 theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
73 theProton = G4Proton::Proton(); << 79 theProton = G4Proton::Proton();
74 currentMaterial = nullptr; << 80 currentMaterial = 0;
75 fixedCut = -1.0; <<
76 81
77 pCuts = nullptr; << 82 pCuts = 0;
78 83
79 recoilThreshold = 0.0; // by default does no << 84 lowEnergyThreshold = 1*keV; // particle will be killed for lower energy
>> 85 recoilThreshold = 0.*keV; // by default does not work
80 86
81 particle = nullptr; << 87 particle = 0;
82 currentCouple = nullptr; << 88 currentCouple = 0;
83 wokvi = new G4WentzelVIRelXSection(); 89 wokvi = new G4WentzelVIRelXSection();
84 90
85 currentMaterialIndex = 0; 91 currentMaterialIndex = 0;
86 mass = CLHEP::proton_mass_c2; << 92
>> 93 cosTetMinNuc = 1.0;
>> 94 cosTetMaxNuc = -1.0;
87 elecRatio = 0.0; 95 elecRatio = 0.0;
>> 96 mass = proton_mass_c2;
88 } 97 }
89 98
90 //....oooOO0OOooo........oooOO0OOooo........oo 99 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
91 100
92 G4hCoulombScatteringModel::~G4hCoulombScatteri 101 G4hCoulombScatteringModel::~G4hCoulombScatteringModel()
93 { 102 {
94 delete wokvi; 103 delete wokvi;
95 } 104 }
96 105
97 //....oooOO0OOooo........oooOO0OOooo........oo 106 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
98 107
99 void G4hCoulombScatteringModel::Initialise(con << 108 void G4hCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
100 const G4DataVector& cuts) 109 const G4DataVector& cuts)
101 { 110 {
102 SetupParticle(part); << 111 SetupParticle(p);
103 currentCouple = nullptr; << 112 currentCouple = 0;
104 << 113 cosThetaMin = cos(PolarAngleLimit());
105 // defined theta limit between single and mu << 114 wokvi->Initialise(p, cosThetaMin);
106 isCombined = true; << 115 /*
107 G4double tet = PolarAngleLimit(); <<
108 <<
109 if(tet <= 0.0) { <<
110 cosThetaMin = 1.0; <<
111 isCombined = false; <<
112 } else if(tet >= CLHEP::pi) { <<
113 cosThetaMin = -1.0; <<
114 } else { <<
115 cosThetaMin = std::cos(tet); <<
116 } <<
117 <<
118 wokvi->Initialise(part, cosThetaMin); <<
119 /* <<
120 G4cout << "G4hCoulombScatteringModel: " << p 116 G4cout << "G4hCoulombScatteringModel: " << particle->GetParticleName()
121 << " 1-cos(ThetaLimit)= " << 1 - cos 117 << " 1-cos(ThetaLimit)= " << 1 - cosThetaMin
122 << " cos(thetaMax)= " << cosThetaMax 118 << " cos(thetaMax)= " << cosThetaMax
123 << G4endl; 119 << G4endl;
124 */ 120 */
125 pCuts = &cuts; << 121 pCuts = G4ProductionCutsTable::GetProductionCutsTable()->GetEnergyCutsVector(3);
126 //G4ProductionCutsTable::GetProductionCutsTa << 122 //G4cout << "!!! G4hCoulombScatteringModel::Initialise for "
127 /* << 123 // << p->GetParticleName() << " cos(TetMin)= " << cosThetaMin
128 G4cout << "!!! G4hCoulombScatteringModel::In << 124 // << " cos(TetMax)= " << cosThetaMax <<G4endl;
129 << part->GetParticleName() << " cos(TetM << 125 // G4cout << "cut0= " << cuts[0] << " cut1= " << cuts[1] << G4endl;
130 << " cos(TetMax)= " << cosThetaMax <<G4e << 126 if(!isInitialised) {
131 G4cout << "cut= " << (*pCuts)[0] << " cut1= << 127 isInitialised = true;
132 */ <<
133 if(!fParticleChange) { <<
134 fParticleChange = GetParticleChangeForGamm 128 fParticleChange = GetParticleChangeForGamma();
135 } 129 }
136 if(IsMaster() && mass < CLHEP::GeV && part-> << 130 if(mass < GeV) {
137 InitialiseElementSelectors(part, cuts); << 131 InitialiseElementSelectors(p,cuts);
138 } <<
139 } <<
140 <<
141 //....oooOO0OOooo........oooOO0OOooo........oo <<
142 <<
143 void G4hCoulombScatteringModel::InitialiseLoca <<
144 G4VEmModel* masterModel) <<
145 { <<
146 SetElementSelectors(masterModel->GetElementS <<
147 } <<
148 <<
149 //....oooOO0OOooo........oooOO0OOooo........oo <<
150 <<
151 G4double <<
152 G4hCoulombScatteringModel::MinPrimaryEnergy(co <<
153 const G4ParticleDefinition* part <<
154 G4double) <<
155 { <<
156 SetupParticle(part); <<
157 <<
158 // define cut using cuts for proton <<
159 G4double cut = <<
160 std::max(recoilThreshold, (*pCuts)[Current <<
161 <<
162 // find out lightest element <<
163 const G4ElementVector* theElementVector = ma <<
164 std::size_t nelm = material->GetNumberOfElem <<
165 <<
166 // select lightest element <<
167 G4int Z = 300; <<
168 for (std::size_t j=0; j<nelm; ++j) { <<
169 Z = std::min(Z,(*theElementVector)[j]->Get <<
170 } 132 }
171 G4int A = G4lrint(fNistManager->GetAtomicMas <<
172 G4double targetMass = G4NucleiProperties::Ge <<
173 G4double t = std::max(cut, 0.5*(cut + std::s <<
174 <<
175 return t; <<
176 } 133 }
177 134
178 //....oooOO0OOooo........oooOO0OOooo........oo 135 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
179 136
180 G4double G4hCoulombScatteringModel::ComputeCro 137 G4double G4hCoulombScatteringModel::ComputeCrossSectionPerAtom(
181 const G4ParticleDefinition* p, 138 const G4ParticleDefinition* p,
182 G4double kinEnergy, 139 G4double kinEnergy,
183 G4double Z, G4double, 140 G4double Z, G4double,
184 G4double cutEnergy, G4double) 141 G4double cutEnergy, G4double)
185 { 142 {
186 //G4cout << "### G4hCoulombScatteringModel:: 143 //G4cout << "### G4hCoulombScatteringModel::ComputeCrossSectionPerAtom for "
187 //<< p->GetParticleName()<<" Z= "<<Z<<" e(Me << 144 // << p->GetParticleName()<<" Z= "<<Z<<" e(MeV)= "<< kinEnergy/MeV << G4endl;
188 G4double cross = 0.0; 145 G4double cross = 0.0;
189 elecRatio = 0.0; <<
190 if(p != particle) { SetupParticle(p); } 146 if(p != particle) { SetupParticle(p); }
191 147
192 // cross section is set to zero to avoid pro 148 // cross section is set to zero to avoid problems in sample secondary
193 if(kinEnergy <= 0.0) { return cross; } 149 if(kinEnergy <= 0.0) { return cross; }
194 DefineMaterial(CurrentCouple()); 150 DefineMaterial(CurrentCouple());
195 << 151 cosTetMinNuc = wokvi->SetupKinematic(kinEnergy, currentMaterial);
196 G4int iz = G4lrint(Z); << 152 if(cosThetaMax < cosTetMinNuc) {
197 G4double tmass = (1 == iz) ? proton_mass_c2 << 153 G4int iz = G4int(Z);
198 fNistManager->GetAtomicMassAmu(iz)*amu_c2; << 154 cosTetMinNuc = wokvi->SetupTarget(iz, cutEnergy);
199 wokvi->SetTargetMass(tmass); << 155 cosTetMaxNuc = cosThetaMax;
200 << 156 if(iz == 1 && cosTetMaxNuc < 0.0 && particle == theProton) {
201 G4double costmin = << 157 cosTetMaxNuc = 0.0;
202 wokvi->SetupKinematic(kinEnergy, currentMa <<
203 <<
204 if(cosThetaMax < costmin) { <<
205 G4double cut = (0.0 < fixedCut) ? fixedCut <<
206 costmin = wokvi->SetupTarget(iz, cut); <<
207 G4double costmax = <<
208 (1 == iz && particle == theProton && cos <<
209 ? 0.0 : cosThetaMax; <<
210 if(costmin > costmax) { <<
211 cross = wokvi->ComputeNuclearCrossSectio <<
212 + wokvi->ComputeElectronCrossSection(costmin <<
213 } 158 }
214 /* << 159 cross = wokvi->ComputeNuclearCrossSection(cosTetMinNuc, cosTetMaxNuc);
215 if(p->GetParticleName() == "mu+") << 160 elecRatio = wokvi->ComputeElectronCrossSection(cosTetMinNuc, cosThetaMax);
>> 161 cross += elecRatio;
>> 162 if(cross > 0.0) { elecRatio /= cross; }
>> 163 }
>> 164 /*
>> 165 if(p->GetParticleName() == "e-")
216 G4cout << "e(MeV)= " << kinEnergy/MeV << " c 166 G4cout << "e(MeV)= " << kinEnergy/MeV << " cross(b)= " << cross/barn
217 << " 1-costmin= " << 1-costmin << 167 << " 1-cosTetMinNuc= " << 1-cosTetMinNuc
218 << " 1-costmax= " << 1-costmax << 168 << " 1-cosTetMaxNuc= " << 1-cosTetMaxNuc
219 << " 1-cosThetaMax= " << 1-cosThetaMax <<
220 << G4endl; 169 << G4endl;
221 */ << 170 */
222 } <<
223 return cross; 171 return cross;
224 } 172 }
225 173
226 //....oooOO0OOooo........oooOO0OOooo........oo 174 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
227 175
228 void G4hCoulombScatteringModel::SampleSecondar 176 void G4hCoulombScatteringModel::SampleSecondaries(
229 std::vector<G4DynamicParticle* 177 std::vector<G4DynamicParticle*>* fvect,
230 const G4MaterialCutsCouple* couple, 178 const G4MaterialCutsCouple* couple,
231 const G4DynamicParticle* dp, 179 const G4DynamicParticle* dp,
232 G4double cutEnergy, 180 G4double cutEnergy,
233 G4double) 181 G4double)
234 { 182 {
235 G4double kinEnergy = dp->GetKineticEnergy(); 183 G4double kinEnergy = dp->GetKineticEnergy();
>> 184
>> 185 // absorb particle below low-energy limit to avoid situation
>> 186 // when a particle has no energy loss
>> 187 if(kinEnergy < lowEnergyThreshold) {
>> 188 fParticleChange->SetProposedKineticEnergy(0.0);
>> 189 fParticleChange->ProposeLocalEnergyDeposit(kinEnergy);
>> 190 fParticleChange->ProposeNonIonizingEnergyDeposit(kinEnergy);
>> 191 return;
>> 192 }
236 SetupParticle(dp->GetDefinition()); 193 SetupParticle(dp->GetDefinition());
237 DefineMaterial(couple); 194 DefineMaterial(couple);
238 195
>> 196 //G4cout << "G4hCoulombScatteringModel::SampleSecondaries e(MeV)= "
>> 197 // << kinEnergy << " " << particle->GetParticleName()
>> 198 // << " cut= " << cutEnergy<< G4endl;
>> 199
239 // Choose nucleus 200 // Choose nucleus
240 G4double cut = (0.0 < fixedCut) ? fixedCut : << 201 const G4Element* currentElement =
>> 202 SelectRandomAtom(couple,particle,kinEnergy,cutEnergy,kinEnergy);
241 203
242 const G4Element* elm = SelectRandomAtom(coup << 204 G4double Z = currentElement->GetZ();
243 kinEnergy,cut,kinEnergy); <<
244 205
245 G4int iz = elm->GetZasInt(); << 206 if(ComputeCrossSectionPerAtom(particle,kinEnergy, Z,
246 G4int ia = SelectIsotopeNumber(elm); << 207 kinEnergy, cutEnergy, kinEnergy) == 0.0)
247 G4double mass2 = G4NucleiProperties::GetNucl << 208 { return; }
248 << 209
249 wokvi->SetTargetMass(mass2); << 210 G4int iz = G4int(Z);
250 wokvi->SetupKinematic(kinEnergy, currentMate << 211 G4int ia = SelectIsotopeNumber(currentElement);
251 G4double costmin = wokvi->SetupTarget(iz, cu << 212 G4double targetMass = G4NucleiProperties::GetNuclearMass(ia, iz);
252 G4double costmax = (1 == iz && particle == t << 213 wokvi->SetTargetMass(targetMass);
253 ? 0.0 : cosThetaMax; <<
254 if(costmin <= costmax) { return; } <<
255 <<
256 G4double cross = wokvi->ComputeNuclearCrossS <<
257 G4double ecross = wokvi->ComputeElectronCros <<
258 G4double ratio = ecross/(cross + ecross); <<
259 214
260 G4ThreeVector newDirection = 215 G4ThreeVector newDirection =
261 wokvi->SampleSingleScattering(costmin, cos << 216 wokvi->SampleSingleScattering(cosTetMinNuc, cosThetaMax, elecRatio);
>> 217 G4double cost = newDirection.z();
>> 218
>> 219 G4ThreeVector direction = dp->GetMomentumDirection();
>> 220 newDirection.rotateUz(direction);
262 221
263 // kinematics in the Lab system <<
264 G4double ptot = std::sqrt(kinEnergy*(kinEner <<
265 G4double e1 = mass + kinEnergy; <<
266 <<
267 // Lab. system kinematics along projectile d <<
268 G4LorentzVector v0 = G4LorentzVector(0, 0, p <<
269 G4LorentzVector v1 = G4LorentzVector(0, 0, p <<
270 G4ThreeVector bst = v0.boostVector(); <<
271 v1.boost(-bst); <<
272 // CM projectile <<
273 G4double momCM = v1.pz(); <<
274 <<
275 // Momentum after scattering of incident par <<
276 v1.setX(momCM*newDirection.x()); <<
277 v1.setY(momCM*newDirection.y()); <<
278 v1.setZ(momCM*newDirection.z()); <<
279 <<
280 // CM--->Lab <<
281 v1.boost(bst); <<
282 <<
283 G4ThreeVector dir = dp->GetMomentumDirection <<
284 newDirection = v1.vect().unit(); <<
285 newDirection.rotateUz(dir); <<
286 <<
287 fParticleChange->ProposeMomentumDirection(ne 222 fParticleChange->ProposeMomentumDirection(newDirection);
288 << 223
289 // recoil << 224 // recoil sampling assuming a small recoil
290 v0 -= v1; << 225 // and first order correction to primary 4-momentum
291 G4double trec = std::max(v0.e() - mass2, 0.0 << 226 G4double mom2 = wokvi->GetMomentumSquare();
>> 227 G4double trec = mom2*(1.0 - cost)
>> 228 /(targetMass + (mass + kinEnergy)*(1.0 - cost));
>> 229
>> 230 // the check likely not needed
>> 231 if(trec > kinEnergy) { trec = kinEnergy; }
>> 232 G4double finalT = kinEnergy - trec;
292 G4double edep = 0.0; 233 G4double edep = 0.0;
>> 234 //G4cout<<"G4eCoulombScatteringModel: finalT= "<<finalT<<" Trec= "
>> 235 // <<trec << " Z= " << iz << " A= " << ia<<G4endl;
293 236
294 G4double tcut = recoilThreshold; 237 G4double tcut = recoilThreshold;
295 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur 238 if(pCuts) { tcut= std::max(tcut,(*pCuts)[currentMaterialIndex]); }
296 << 239
297 if(trec > tcut) { 240 if(trec > tcut) {
298 G4ParticleDefinition* ion = theIonTable->G 241 G4ParticleDefinition* ion = theIonTable->GetIon(iz, ia, 0);
299 newDirection = v0.vect().unit(); << 242 G4ThreeVector dir = (direction*sqrt(mom2) -
300 newDirection.rotateUz(dir); << 243 newDirection*sqrt(finalT*(2*mass + finalT))).unit();
301 auto newdp = new G4DynamicParticle(ion, ne << 244 G4DynamicParticle* newdp = new G4DynamicParticle(ion, dir, trec);
302 fvect->push_back(newdp); 245 fvect->push_back(newdp);
303 } else if(trec > 0.0) { << 246 } else {
304 edep = trec; 247 edep = trec;
305 fParticleChange->ProposeNonIonizingEnergyD 248 fParticleChange->ProposeNonIonizingEnergyDeposit(edep);
306 } 249 }
307 250
308 // finelize primary energy and energy balanc 251 // finelize primary energy and energy balance
309 G4double finalT = v1.e() - mass; << 252 // this threshold may be applied only because for low-enegry
310 if(finalT < 0.0) { << 253 // e+e- msc model is applied
311 edep += finalT; << 254 if(finalT <= lowEnergyThreshold) {
>> 255 edep += finalT;
312 finalT = 0.0; 256 finalT = 0.0;
313 } 257 }
314 edep = std::max(edep, 0.0); <<
315 fParticleChange->SetProposedKineticEnergy(fi 258 fParticleChange->SetProposedKineticEnergy(finalT);
316 fParticleChange->ProposeLocalEnergyDeposit(e 259 fParticleChange->ProposeLocalEnergyDeposit(edep);
317 } 260 }
318 261
319 //....oooOO0OOooo........oooOO0OOooo........oo 262 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 263
>> 264
320 265