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25 // 25 //
>> 26 // $Id: G4eCoulombScatteringModel.cc,v 1.10 2006/10/26 17:36:17 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-08-02 $
26 // 28 //
27 // ------------------------------------------- 29 // -------------------------------------------------------------------
28 // 30 //
29 // GEANT4 Class file 31 // GEANT4 Class file
30 // 32 //
31 // 33 //
32 // File name: G4eCoulombScatteringModel 34 // File name: G4eCoulombScatteringModel
33 // 35 //
34 // Author: Vladimir Ivanchenko 36 // Author: Vladimir Ivanchenko
35 // 37 //
36 // Creation date: 22.08.2005 38 // Creation date: 22.08.2005
37 // 39 //
38 // Modifications: V.Ivanchenko << 40 // Modifications:
39 // << 41 // 01.08.06 V.Ivanchenko extend upper limit of table to TeV and review the
40 // << 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
41 // 45 //
42 // Class Description: 46 // Class Description:
43 // 47 //
44 // ------------------------------------------- 48 // -------------------------------------------------------------------
45 // 49 //
46 //....oooOO0OOooo........oooOO0OOooo........oo 50 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47 //....oooOO0OOooo........oooOO0OOooo........oo 51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
48 52
49 #include "G4eCoulombScatteringModel.hh" 53 #include "G4eCoulombScatteringModel.hh"
50 #include "G4PhysicalConstants.hh" <<
51 #include "G4SystemOfUnits.hh" <<
52 #include "Randomize.hh" 54 #include "Randomize.hh"
53 #include "G4DataVector.hh" 55 #include "G4DataVector.hh"
54 #include "G4ElementTable.hh" 56 #include "G4ElementTable.hh"
>> 57 #include "G4PhysicsLogVector.hh"
55 #include "G4ParticleChangeForGamma.hh" 58 #include "G4ParticleChangeForGamma.hh"
56 #include "G4Proton.hh" <<
57 #include "G4ParticleTable.hh" <<
58 #include "G4IonTable.hh" <<
59 #include "G4ProductionCutsTable.hh" <<
60 #include "G4NucleiProperties.hh" <<
61 #include "G4Pow.hh" <<
62 #include "G4NistManager.hh" <<
63 59
64 //....oooOO0OOooo........oooOO0OOooo........oo 60 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
65 61
66 using namespace std; 62 using namespace std;
67 63
68 G4eCoulombScatteringModel::G4eCoulombScatterin << 64 G4eCoulombScatteringModel::G4eCoulombScatteringModel(
69 : G4VEmModel("eCoulombScattering"), isCombin << 65 G4double thetaMin, G4double thetaMax, G4bool build,
70 { << 66 G4double tlim, const G4String& nam)
71 fNistManager = G4NistManager::Instance(); << 67 : G4VEmModel(nam),
72 theIonTable = G4ParticleTable::GetParticleT << 68 cosThetaMin(cos(thetaMin)),
73 theProton = G4Proton::Proton(); << 69 cosThetaMax(cos(thetaMax)),
74 << 70 q2Limit(tlim),
75 wokvi = new G4WentzelOKandVIxSection(isCombi << 71 theCrossSectionTable(0),
76 << 72 lowKEnergy(keV),
77 mass = CLHEP::proton_mass_c2; << 73 highKEnergy(TeV),
>> 74 alpha2(fine_structure_const*fine_structure_const),
>> 75 faclim(100.0),
>> 76 nbins(12),
>> 77 nmax(100),
>> 78 buildTable(build),
>> 79 isInitialised(false)
>> 80 {
>> 81 a0 = alpha2*electron_mass_c2*electron_mass_c2/(0.885*0.885);
>> 82 G4double p0 = electron_mass_c2*classic_electr_radius;
>> 83 coeff = twopi*p0*p0;
78 } 84 }
79 85
80 //....oooOO0OOooo........oooOO0OOooo........oo 86 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
81 87
82 G4eCoulombScatteringModel::~G4eCoulombScatteri 88 G4eCoulombScatteringModel::~G4eCoulombScatteringModel()
83 { 89 {
84 delete wokvi; << 90 if(theCrossSectionTable) {
>> 91 theCrossSectionTable->clearAndDestroy();
>> 92 delete theCrossSectionTable;
>> 93 }
85 } 94 }
86 95
87 //....oooOO0OOooo........oooOO0OOooo........oo 96 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
88 97
89 void G4eCoulombScatteringModel::Initialise(con << 98 void G4eCoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
90 const G4DataVector& cuts) << 99 const G4DataVector&)
91 { 100 {
92 SetupParticle(part); << 101 if(isInitialised) return;
93 currentCouple = nullptr; << 102 isInitialised = true;
94 103
95 G4double tet = PolarAngleLimit(); << 104 if(pParticleChange)
>> 105 fParticleChange =
>> 106 reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
>> 107 else
>> 108 fParticleChange = new G4ParticleChangeForGamma();
96 109
97 // defined theta limit between single and mu << 110 if(!buildTable || p->GetParticleName() == "GenericIon") return;
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 } <<
106 111
107 wokvi->Initialise(part, cosThetaMin); << 112 // Compute cross section multiplied by Ptot^2*beta^2
108 pCuts = &cuts; << 113 theCrossSectionTable = new G4PhysicsTable();
109 /* << 114 G4PhysicsLogVector* ptrVector;
110 G4cout << "G4eCoulombScatteringModel::Initia << 115 G4double e, value;
111 << part->GetParticleName() << " 1-cos(Tet << 116 nbins = 2*G4int(log10(highKEnergy/lowKEnergy));
112 << " 1-cos(TetMax)= " << 1. - cosThetaMax <<
113 G4cout << "cut[0]= " << (*pCuts)[0] << G4end <<
114 */ <<
115 if(nullptr == fParticleChange) { <<
116 fParticleChange = GetParticleChangeForGamm <<
117 } <<
118 if(IsMaster() && mass < GeV && part->GetPart <<
119 InitialiseElementSelectors(part, cuts); <<
120 } <<
121 } <<
122 117
123 //....oooOO0OOooo........oooOO0OOooo........oo << 118 const G4ElementTable* elmt = G4Element::GetElementTable();
>> 119 size_t nelm = G4Element::GetNumberOfElements();
124 120
125 void G4eCoulombScatteringModel::InitialiseLoca << 121 for(size_t j=0; j<nelm; j++) {
126 G4VEmModel* masterModel) <<
127 { <<
128 SetElementSelectors(masterModel->GetElementS <<
129 } <<
130 <<
131 //....oooOO0OOooo........oooOO0OOooo........oo <<
132 122
133 G4double << 123 ptrVector = new G4PhysicsLogVector(lowKEnergy, highKEnergy, nbins);
134 G4eCoulombScatteringModel::MinPrimaryEnergy(co << 124 const G4Element* elm = (*elmt)[j];
135 const G4ParticleDefinition* part << 125 G4double Z = elm->GetZ();
136 G4double) << 126 index[G4int(Z)] = j;
137 { << 127 for(G4int i=0; i<=nbins; i++) {
138 SetupParticle(part); << 128 e = ptrVector->GetLowEdgeEnergy( i ) ;
>> 129 value = CalculateCrossSectionPerAtom(p, e, Z);
>> 130 ptrVector->PutValue( i, log(value) );
>> 131 }
139 132
140 // define cut using cuts for proton << 133 theCrossSectionTable->insert(ptrVector);
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 } 134 }
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 } 135 }
159 136
160 //....oooOO0OOooo........oooOO0OOooo........oo << 137 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
161 138
162 G4double G4eCoulombScatteringModel::ComputeCro << 139 G4double G4eCoulombScatteringModel::CalculateCrossSectionPerAtom(
163 const G4ParticleDefinition* p, << 140 const G4ParticleDefinition* p,
164 G4double kinEnergy, << 141 G4double kinEnergy,
165 G4double Z, G4double, << 142 G4double Z)
166 G4double cutEnergy, G4double) <<
167 { 143 {
168 /* <<
169 G4cout << "### G4eCoulombScatteringModel::Co <<
170 << p->GetParticleName()<<" Z= "<<Z<<" e(MeV <<
171 << G4endl; <<
172 */ <<
173 G4double cross = 0.0; 144 G4double cross = 0.0;
174 elecRatio = 0.0; << 145 G4double m = p->GetPDGMass();
175 if(p != particle) { SetupParticle(p); } << 146 G4double tkin = std::max(keV, kinEnergy);
176 << 147 G4double mom2 = tkin*(tkin + 2.0*m);
177 // cross section is set to zero to avoid pro << 148 G4double costm = std::max(cosThetaMax, 1.0 - 0.5*q2Limit/mom2);
178 if(kinEnergy <= 0.0) { return cross; } << 149 if(costm < cosThetaMin) {
179 DefineMaterial(CurrentCouple()); << 150 G4double q = p->GetPDGCharge()/eplus;
180 G4double costmin = wokvi->SetupKinematic(kin << 151 G4double q2 = q*q;
181 << 152 G4double invbeta2 = 1.0 + m*m/mom2;
182 //G4cout << "cosThetaMax= "<<cosThetaMax<<" << 153 G4double A = ScreeningParameter(Z, q2, mom2, invbeta2);
183 << 154 G4double a = 2.0*A + 1.0;
184 if(cosThetaMax < costmin) { << 155 cross = coeff*Z*(Z + 1.0)*q2*invbeta2*(cosThetaMin - costm)/
185 G4int iz = G4lrint(Z); << 156 ((a - cosThetaMin)*(a - costm)*mom2);
186 G4double cut = (0.0 < fixedCut) ? fixedCut << 157 /*
187 costmin = wokvi->SetupTarget(iz, cut); << 158 if(Z == 13 || Z == 79) {
188 //G4cout << "SetupTarget: Z= " << iz << " << 159 G4cout << "## e= " << kinEnergy << " beta= " << sqrt (1.0/invbeta2)
189 // << costmin << G4endl; << 160 <<" Z= " << Z
190 G4double costmax = (1 == iz && particle == << 161 << " sig(bn)= " << cross/barn
191 ? 0.0 : cosThetaMax; << 162 << " cosMax= " << costm
192 if(costmin > costmax) { << 163 << " cosMin= " << cosThetaMin
193 cross = wokvi->ComputeNuclearCrossSectio << 164 << G4endl;
194 + wokvi->ComputeElectronCrossSection(c << 165 G4double atommass = 27.0;
>> 166 if(Z == 79) atommass = 197.0;
>> 167 G4double u0 = 1.e+6*atommass*cm2/(cross*Avogadro);
>> 168 G4double u1 = 0.5*u0/( A* ( (1.0 + A)*log(1.0 + 1.0/A) -1.0 ) );
>> 169 G4cout << " l0= " << u0 << " l1= " << u1
>> 170 << " A= " << A << G4endl;
195 } 171 }
196 /* <<
197 if(p->GetParticleName() == "e-") <<
198 G4cout << "Z= " << Z << " e(MeV)= " << kin <<
199 << " cross(b)= " << cross/barn << " 1-cos <<
200 << " 1-costmax= " << 1-costmax <<
201 << " 1-cosThetaMax= " << 1-cosThetaMax <<
202 << " " << currentMaterial->GetName() <<
203 << G4endl; <<
204 */ 172 */
205 } 173 }
206 //G4cout << "====== cross= " << cross << G4e << 174 return cross;
207 return cross; <<
208 } 175 }
209 176
210 //....oooOO0OOooo........oooOO0OOooo........oo 177 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
211 178
212 void G4eCoulombScatteringModel::SampleSecondar << 179 std::vector<G4DynamicParticle*>* G4eCoulombScatteringModel::SampleSecondaries(
213 std::vector<G4DynamicParticle* << 180 const G4MaterialCutsCouple* couple,
214 const G4MaterialCutsCouple* couple, << 181 const G4DynamicParticle* dp,
215 const G4DynamicParticle* dp, << 182 G4double,
216 G4double cutEnergy, << 183 G4double)
217 G4double) <<
218 { 184 {
>> 185 const G4Material* aMaterial = couple->GetMaterial();
>> 186 const G4ParticleDefinition* p = dp->GetDefinition();
>> 187
>> 188 G4double mass = dp->GetMass();
219 G4double kinEnergy = dp->GetKineticEnergy(); 189 G4double kinEnergy = dp->GetKineticEnergy();
220 SetupParticle(dp->GetDefinition()); << 190 G4double mom2 = kinEnergy*(kinEnergy + 2.0*mass);
221 DefineMaterial(couple); <<
222 /* <<
223 G4cout << "G4eCoulombScatteringModel::Sample <<
224 << kinEnergy << " " << particle->GetPart <<
225 << " cut= " << cutEnergy<< G4endl; <<
226 */ <<
227 // Choose nucleus <<
228 G4double cut = (0.0 < fixedCut) ? fixedCut : <<
229 <<
230 wokvi->SetupKinematic(kinEnergy, currentMate <<
231 <<
232 const G4Element* currentElement = SelectTarg <<
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 <<
245 G4int ia = SelectIsotopeNumber(currentElemen <<
246 G4double targetMass = G4NucleiProperties::Ge <<
247 wokvi->SetTargetMass(targetMass); <<
248 <<
249 G4ThreeVector newDirection = <<
250 wokvi->SampleSingleScattering(costmin, cos <<
251 G4double cost = newDirection.z(); <<
252 /* <<
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 <<
261 newDirection.rotateUz(direction); <<
262 191
263 fParticleChange->ProposeMomentumDirection(ne << 192 const G4Element* elm = SelectRandomAtom(aMaterial, p, kinEnergy);
>> 193 G4double Z = elm->GetZ();
>> 194 G4double q = p->GetPDGCharge()/eplus;
>> 195 G4double q2 = q*q;
264 196
265 // recoil sampling assuming a small recoil << 197 G4double invbeta2 = 1.0 + mass*mass/mom2;
266 // and first order correction to primary 4-m << 198 G4double a = 2.*ScreeningParameter(Z, q2, mom2, invbeta2);
267 G4double mom2 = wokvi->GetMomentumSquare(); <<
268 G4double trec = mom2*(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; <<
274 G4double edep = 0.0; <<
275 /* <<
276 G4cout<<"G4eCoulombScatteringModel: finalT <<
277 <<trec << " Z= " << iz << " A= " << ia <<
278 << " tcut(keV)= " << (*pCuts)[currentMater <<
279 */ <<
280 G4double tcut = recoilThreshold; <<
281 if(pCuts) { tcut= std::max(tcut,(*pCuts)[cur <<
282 199
283 if(trec > tcut) { << 200 G4double costm = std::max(cosThetaMax, 1.0 - 0.5*q2Limit/mom2);
284 G4ParticleDefinition* ion = theIonTable->G << 201 if(costm >= cosThetaMin) return 0;
285 G4ThreeVector dir = (direction*sqrt(mom2) << 202
286 newDirection*sqrt(finalT*(2*mass + fina << 203 G4double x = G4UniformRand();
287 auto newdp = new G4DynamicParticle(ion, di << 204 G4double y = (a + 1.0 - cosThetaMin)/(cosThetaMin - costm);
288 fvect->push_back(newdp); << 205 G4double st2 = 0.5*(y*(1.0 - costm) - a*x)/(y + x);
289 } else { << 206 if(st2 < 0.0 || st2 > 1.0) {
290 edep = trec; << 207 G4cout << "G4eCoulombScatteringModel::SampleSecondaries WARNING st2= "
291 fParticleChange->ProposeNonIonizingEnergyD << 208 << st2 << G4endl;
>> 209 st2 = 0.0;
292 } 210 }
293 211
294 // finelize primary energy and energy bala << 212 G4double tet = 2.0*asin(sqrt(st2));
295 // this threshold may be applied only beca << 213 G4double cost= cos(tet);
296 // e+e- msc model is applied << 214 G4double sint= sin(tet);
297 if(finalT < 0.0) { << 215
298 edep += finalT; << 216 G4double phi = twopi * G4UniformRand();
299 finalT = 0.0; << 217
300 } << 218 G4ThreeVector direction = dp->GetMomentumDirection();
301 edep = std::max(edep, 0.0); << 219 G4ThreeVector newDirection(cos(phi)*sint,sin(phi)*sint,cost);
302 fParticleChange->SetProposedKineticEnergy(fi << 220 newDirection.rotateUz(direction);
303 fParticleChange->ProposeLocalEnergyDeposit(e << 221
>> 222 fParticleChange->ProposeMomentumDirection(newDirection);
>> 223
>> 224 return 0;
304 } 225 }
305 226
306 //....oooOO0OOooo........oooOO0OOooo........oo 227 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
>> 228
>> 229
307 230