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>> 26 // $Id: G4PolarizedAnnihilationModel.cc,v 1.4 2006/11/17 14:14:20 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-08-03-patch-01 $
>> 28 //
26 // ------------------------------------------- 29 // -------------------------------------------------------------------
27 // 30 //
28 // Geant4 Class file << 31 // GEANT4 Class file
>> 32 //
29 // 33 //
30 // File name: G4PolarizedAnnihilationModel 34 // File name: G4PolarizedAnnihilationModel
31 // 35 //
32 // Author: Andreas Schaelicke 36 // Author: Andreas Schaelicke
33 // 37 //
>> 38 // Creation date: 01.05.2005
>> 39 //
>> 40 // Modifications:
>> 41 // 18-07-06 use newly calculated cross sections (P. Starovoitov)
>> 42 // 21-08-06 update interface (A. Schaelicke)
>> 43 // 17-11-06 add protection agaist e+ zero energy PostStep (V.Ivanchenko)
>> 44 //
>> 45 //
34 // Class Description: 46 // Class Description:
35 // Implementation of polarized gamma Annihil << 47 //
>> 48 // Implementation of polarized gamma Annihilation scattering on free electron
>> 49 //
36 50
>> 51 // -------------------------------------------------------------------
37 #include "G4PolarizedAnnihilationModel.hh" 52 #include "G4PolarizedAnnihilationModel.hh"
38 <<
39 #include "G4Gamma.hh" <<
40 #include "G4ParticleChangeForGamma.hh" <<
41 #include "G4PhysicalConstants.hh" <<
42 #include "G4PolarizationHelper.hh" <<
43 #include "G4PolarizationManager.hh" 53 #include "G4PolarizationManager.hh"
44 #include "G4PolarizedAnnihilationXS.hh" << 54 #include "G4PolarizationHelper.hh"
45 #include "G4StokesVector.hh" 55 #include "G4StokesVector.hh"
46 #include "G4TrackStatus.hh" << 56 #include "G4PolarizedAnnihilationCrossSection.hh"
>> 57 #include "G4ParticleChangeForGamma.hh"
>> 58 #include "G4Gamma.hh"
47 59
48 G4PolarizedAnnihilationModel::G4PolarizedAnnih << 60 G4PolarizedAnnihilationModel::G4PolarizedAnnihilationModel(const G4ParticleDefinition* p,
49 const G4ParticleDefinition* p, const G4Strin << 61 const G4String& nam)
50 : G4eeToTwoGammaModel(p, nam) << 62 : G4eeToTwoGammaModel(p,nam),crossSectionCalculator(0)
51 , fCrossSectionCalculator(nullptr) <<
52 , fParticleChange(nullptr) <<
53 , fVerboseLevel(0) <<
54 { 63 {
55 fCrossSectionCalculator = new G4PolarizedAn << 64 crossSectionCalculator=new G4PolarizedAnnihilationCrossSection();
56 fBeamPolarization = G4StokesVector::Z <<
57 fTargetPolarization = G4StokesVector::Z <<
58 fFinalGamma1Polarization = G4StokesVector::Z <<
59 fFinalGamma2Polarization = G4StokesVector::Z <<
60 } 65 }
61 66
62 //....oooOO0OOooo........oooOO0OOooo........oo <<
63 G4PolarizedAnnihilationModel::~G4PolarizedAnni 67 G4PolarizedAnnihilationModel::~G4PolarizedAnnihilationModel()
64 { 68 {
65 delete fCrossSectionCalculator; << 69 if (crossSectionCalculator) delete crossSectionCalculator;
66 } 70 }
67 71
68 //....oooOO0OOooo........oooOO0OOooo........oo <<
69 void G4PolarizedAnnihilationModel::Initialise( <<
70 <<
71 { <<
72 G4eeToTwoGammaModel::Initialise(part, dv); <<
73 if(fParticleChange) <<
74 { <<
75 return; <<
76 } <<
77 fParticleChange = GetParticleChangeForGamma( <<
78 } <<
79 <<
80 //....oooOO0OOooo........oooOO0OOooo........oo <<
81 G4double G4PolarizedAnnihilationModel::Compute 72 G4double G4PolarizedAnnihilationModel::ComputeCrossSectionPerElectron(
82 G4double kinEnergy) << 73 const G4ParticleDefinition* pd,
>> 74 G4double kinEnergy,
>> 75 G4double cut,
>> 76 G4double emax)
83 { 77 {
84 // cross section from base model << 78 G4double xs = G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(pd,kinEnergy,
85 G4double xs = G4eeToTwoGammaModel::ComputeCr << 79 cut,emax);
86 80
87 G4double polzz = fBeamPolarization.z() * fTa << 81 G4double polzz = theBeamPolarization.z()*theTargetPolarization.z();
88 G4double poltt = fBeamPolarization.x() * fTa << 82 G4double poltt = theBeamPolarization.x()*theTargetPolarization.x()
89 fBeamPolarization.y() * fTa << 83 + theBeamPolarization.y()*theTargetPolarization.y();
90 if(polzz != 0 || poltt != 0) << 84 if (polzz!=0 || poltt!=0) {
91 { << 85 G4double xval,lasym,tasym;
92 G4double xval, lasym, tasym; << 86 ComputeAsymmetriesPerElectron(kinEnergy,xval,lasym,tasym);
93 ComputeAsymmetriesPerElectron(kinEnergy, x << 87 xs*=(1.+polzz*lasym+poltt*tasym);
94 xs *= (1. + polzz * lasym + poltt * tasym) <<
95 } 88 }
96 89
97 return xs; 90 return xs;
98 } 91 }
99 92
100 //....oooOO0OOooo........oooOO0OOooo........oo << 93 void G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron(G4double ene,
101 void G4PolarizedAnnihilationModel::ComputeAsym << 94 G4double & valueX,
102 G4double ene, G4double& valueX, G4double& va << 95 G4double & valueA,
>> 96 G4double & valueT)
103 { 97 {
104 // *** calculate asymmetries 98 // *** calculate asymmetries
105 G4double gam = 1. + ene / electron_mass_c2; << 99 G4double gam = 1. + ene/electron_mass_c2;
106 G4double xs0 = fCrossSectionCalculator->Tota << 100 G4double xs0=crossSectionCalculator->TotalXSection(0.,1.,gam,
107 0., 1., gam, G4StokesVector::ZERO, G4Stoke << 101 G4StokesVector::ZERO,
108 G4double xsA = fCrossSectionCalculator->Tota << 102 G4StokesVector::ZERO);
109 0., 1., gam, G4StokesVector::P3, G4StokesV << 103 G4double xsA=crossSectionCalculator->TotalXSection(0.,1.,gam,
110 G4double xsT1 = fCrossSectionCalculator->Tot << 104 G4StokesVector::P3,
111 0., 1., gam, G4StokesVector::P1, G4StokesV << 105 G4StokesVector::P3);
112 G4double xsT2 = fCrossSectionCalculator->Tot << 106 G4double xsT1=crossSectionCalculator->TotalXSection(0.,1.,gam,
113 0., 1., gam, G4StokesVector::P2, G4StokesV << 107 G4StokesVector::P1,
114 G4double xsT = 0.5 * (xsT1 + xsT2); << 108 G4StokesVector::P1);
115 << 109 G4double xsT2=crossSectionCalculator->TotalXSection(0.,1.,gam,
116 valueX = xs0; << 110 G4StokesVector::P2,
117 valueA = xsA / xs0 - 1.; << 111 G4StokesVector::P2);
118 valueT = xsT / xs0 - 1.; << 112 G4double xsT=0.5*(xsT1+xsT2);
119 << 113
120 if((valueA < -1) || (1 < valueA)) << 114 valueX=xs0;
121 { << 115 valueA=xsA/xs0-1.;
122 G4ExceptionDescription ed; << 116 valueT=xsT/xs0-1.;
123 ed << " ERROR PolarizedAnnihilationPS::Com << 117 // G4cout<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl;
124 ed << " something wrong in total cross sec << 118 if ( (valueA < -1) || (1 < valueA)) {
125 ed << " LONG: " << valueX << "\t" << value << 119 G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
126 << " energy = " << gam << G4endl; << 120 G4cout<< " something wrong in total cross section calculation (valueA)\n";
127 G4Exception("G4PolarizedAnnihilationModel: << 121 G4cout<<"*********** LONG "<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl;
128 "pol004", JustWarning, ed); <<
129 } 122 }
130 if((valueT < -1) || (1 < valueT)) << 123 if ( (valueT < -1) || (1 < valueT)) {
131 { << 124 G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
132 G4ExceptionDescription ed; << 125 G4cout<< " something wrong in total cross section calculation (valueT)\n";
133 ed << " ERROR PolarizedAnnihilationPS::Com << 126 G4cout<<"****** TRAN "<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl;
134 ed << " something wrong in total cross sec <<
135 ed << " TRAN: " << valueX << "\t" << value <<
136 << " energy = " << gam << G4endl; <<
137 G4Exception("G4PolarizedAnnihilationModel: <<
138 "pol005", JustWarning, ed); <<
139 } 127 }
140 } 128 }
141 129
142 void G4PolarizedAnnihilationModel::SampleSecon <<
143 std::vector<G4DynamicParticle*>* fvect, cons <<
144 const G4DynamicParticle* dp, G4double, G4dou <<
145 { <<
146 const G4Track* aTrack = fParticleChange->Get <<
147 130
148 // kill primary << 131
149 fParticleChange->SetProposedKineticEnergy(0. << 132
150 fParticleChange->ProposeTrackStatus(fStopAnd << 133 std::vector<G4DynamicParticle*>* G4PolarizedAnnihilationModel::SampleSecondaries(
>> 134 const G4MaterialCutsCouple* /*couple*/,
>> 135 const G4DynamicParticle* dp,
>> 136 G4double /*tmin*/,
>> 137 G4double /*maxEnergy*/)
>> 138 {
>> 139 G4ParticleChangeForGamma* fParticleChange
>> 140 = dynamic_cast<G4ParticleChangeForGamma*>(pParticleChange);
>> 141 const G4Track * aTrack = fParticleChange->GetCurrentTrack();
151 142
152 // V.Ivanchenko add protection against zero 143 // V.Ivanchenko add protection against zero kin energy
>> 144 std::vector<G4DynamicParticle*>* fvect = new std::vector<G4DynamicParticle*>;
153 G4double PositKinEnergy = dp->GetKineticEner 145 G4double PositKinEnergy = dp->GetKineticEnergy();
154 146
155 if(PositKinEnergy == 0.0) << 147 if(PositKinEnergy < DBL_MIN) {
156 { << 148
157 G4double cosTeta = 2. * G4UniformRand() - << 149 G4double cosTeta = 2.*G4UniformRand()-1.;
158 G4double sinTeta = std::sqrt((1.0 - cosTet << 150 G4double sinTeta = std::sqrt((1.0 - cosTeta)*(1.0 + cosTeta));
159 G4double phi = twopi * G4UniformRand() 151 G4double phi = twopi * G4UniformRand();
160 G4ThreeVector dir(sinTeta * std::cos(phi), << 152 G4ThreeVector dir(sinTeta*std::cos(phi), sinTeta*std::sin(phi), cosTeta);
161 cosTeta); << 153 fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(), dir, electron_mass_c2));
162 fvect->push_back( << 154 fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(),-dir, electron_mass_c2));
163 new G4DynamicParticle(G4Gamma::Gamma(), << 155 return fvect;
164 fvect->push_back( <<
165 new G4DynamicParticle(G4Gamma::Gamma(), <<
166 return; <<
167 } 156 }
168 157
169 // *** obtain and save target and beam polar 158 // *** obtain and save target and beam polarization ***
170 G4PolarizationManager* polarizationManager = << 159 G4PolarizationManager * polarizationManager = G4PolarizationManager::GetInstance();
171 G4PolarizationManager::GetInstance(); <<
172 160
173 // obtain polarization of the beam 161 // obtain polarization of the beam
174 fBeamPolarization = G4StokesVector(aTrack->G << 162 theBeamPolarization = aTrack->GetPolarization();
175 163
176 // obtain polarization of the media 164 // obtain polarization of the media
177 G4VPhysicalVolume* aPVolume = aTrack->Get << 165 G4VPhysicalVolume* aPVolume = aTrack->GetVolume();
178 G4LogicalVolume* aLVolume = aPVolume->G << 166 G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume();
179 const G4bool targetIsPolarized = polarizatio 167 const G4bool targetIsPolarized = polarizationManager->IsPolarized(aLVolume);
180 fTargetPolarization = polarizationManager->G << 168 theTargetPolarization = polarizationManager->GetVolumePolarization(aLVolume);
181 <<
182 if(fVerboseLevel >= 1) <<
183 { <<
184 G4cout << "G4PolarizedComptonModel::Sample <<
185 << aLVolume->GetName() << G4endl; <<
186 } <<
187 169
188 // transfer target electron polarization in 170 // transfer target electron polarization in frame of positron
189 if(targetIsPolarized) << 171 if (targetIsPolarized)
190 fTargetPolarization.rotateUz(dp->GetMoment << 172 theTargetPolarization.rotateUz(dp->GetMomentumDirection());
191 << 173
192 G4ParticleMomentum PositDirection = dp->GetM 174 G4ParticleMomentum PositDirection = dp->GetMomentumDirection();
193 175
194 // polar asymmetry: 176 // polar asymmetry:
195 G4double polarization = fBeamPolarization.p3 << 177 G4double polarization = theBeamPolarization.p3()*theTargetPolarization.p3();
196 178
197 G4double gamam1 = PositKinEnergy / electron_ << 179 G4double gamam1 = PositKinEnergy/electron_mass_c2;
198 G4double gama = gamam1 + 1., gamap1 = gamam1 << 180 G4double gama = gamam1+1. , gamap1 = gamam1+2.;
199 G4double sqgrate = std::sqrt(gamam1 / gamap1 << 181 G4double sqgrate = std::sqrt(gamam1/gamap1)/2. , sqg2m1 = std::sqrt(gamam1*gamap1);
200 sqg2m1 = std::sqrt(gamam1 * gamap1 <<
201 182
202 // limits of the energy sampling 183 // limits of the energy sampling
203 G4double epsilmin = 0.5 - sqgrate, epsilmax << 184 G4double epsilmin = 0.5 - sqgrate , epsilmax = 0.5 + sqgrate;
204 G4double epsilqot = epsilmax / epsilmin; << 185 G4double epsilqot = epsilmax/epsilmin;
205 << 186
206 // sample the energy rate of the created gam << 187 //
207 // note: for polarized partices, the actual << 188 // sample the energy rate of the created gammas
>> 189 // note: for polarized partices, the actual dicing strategy
208 // will depend on the energy, and the 190 // will depend on the energy, and the degree of polarization !!
>> 191 //
209 G4double epsil; 192 G4double epsil;
210 G4double gmax = 1. + std::fabs(polarization) << 193 G4double gmax=1. + std::fabs(polarization); // crude estimate
>> 194
>> 195 G4bool check_range=true;
211 196
212 fCrossSectionCalculator->Initialize(epsilmin << 197 crossSectionCalculator->Initialize(epsilmin, gama, 0., theBeamPolarization, theTargetPolarization);
213 fTargetP << 198 if (crossSectionCalculator->DiceEpsilon()<0) {
214 if(fCrossSectionCalculator->DiceEpsilon() < << 199 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
215 { << 200 <<"epsilmin DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl;
216 G4ExceptionDescription ed; << 201 check_range=false;
217 ed << "ERROR in PolarizedAnnihilationPS::P <<
218 << "epsilmin DiceRoutine not appropriat <<
219 << fCrossSectionCalculator->DiceEpsilon <<
220 G4Exception("G4PolarizedAnnihilationModel: <<
221 JustWarning, ed); <<
222 } 202 }
223 203
224 fCrossSectionCalculator->Initialize(epsilmax << 204 crossSectionCalculator->Initialize(epsilmax, gama, 0., theBeamPolarization, theTargetPolarization);
225 fTargetP << 205 if (crossSectionCalculator->DiceEpsilon()<0) {
226 if(fCrossSectionCalculator->DiceEpsilon() < << 206 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
227 { << 207 <<"epsilmax DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl;
228 G4ExceptionDescription ed; << 208 check_range=false;
229 ed << "ERROR in PolarizedAnnihilationPS::P <<
230 << "epsilmax DiceRoutine not appropriat <<
231 << fCrossSectionCalculator->DiceEpsilon <<
232 G4Exception("G4PolarizedAnnihilationModel: <<
233 JustWarning, ed); <<
234 } 209 }
235 210
236 G4int ncount = 0; << 211 G4int ncount=0;
237 G4double trejectmax = 0.; << 212 G4double trejectmax=0.;
238 G4double treject; 213 G4double treject;
239 214
240 do << 215
241 { << 216 do {
242 epsil = epsilmin * std::pow(epsilqot, G4Un << 217 //
243 << 218 epsil = epsilmin*std::pow(epsilqot,G4UniformRand());
244 fCrossSectionCalculator->Initialize(epsil, << 219
245 fTarge << 220 crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,1);
246 << 221
247 treject = fCrossSectionCalculator->DiceEps << 222 treject = crossSectionCalculator->DiceEpsilon();
248 treject *= epsil; << 223 treject*=epsil;
249 << 224
250 if(treject > gmax || treject < 0.) << 225 if (treject>gmax || treject<0.)
251 { << 226 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
252 G4ExceptionDescription ed; << 227 <<" eps ("<<epsil<<") rejection does not work properly: "<<treject<<G4endl;
253 ed << "ERROR in PolarizedAnnihilationPS: <<
254 << " eps (" << epsil <<
255 << ") rejection does not work properl <<
256 G4Exception("G4PolarizedAnnihilationMode <<
257 JustWarning, ed); <<
258 } <<
259 ++ncount; 228 ++ncount;
260 if(treject > trejectmax) << 229 if (treject>trejectmax) trejectmax=treject;
261 trejectmax = treject; << 230 if (ncount>1000) {
262 if(ncount > 1000) << 231 G4cout<<"WARNING in PolarizedAnnihilationPS::PostStepDoIt\n"
263 { << 232 <<"eps dicing very inefficient ="<<trejectmax/gmax
264 G4ExceptionDescription ed; << 233 <<", "<<treject/gmax<<". For secondary energy = "<<epsil<<" "<<ncount<<G4endl;
265 ed << "WARNING in PolarizedAnnihilation <<
266 << "eps dicing very inefficient =" << <<
267 << treject / gmax << ". For secondar <<
268 << ncount << G4endl; <<
269 G4Exception("G4PolarizedAnnihilationMode <<
270 JustWarning, ed); <<
271 break; 234 break;
272 } 235 }
273 236
274 // Loop checking, 03-Aug-2015, Vladimir Iv << 237 } while( treject < gmax*G4UniformRand() );
275 } while(treject < gmax * G4UniformRand()); <<
276 238
>> 239 //
277 // scattered Gamma angles. ( Z - axis along 240 // scattered Gamma angles. ( Z - axis along the parent positron)
278 G4double cost = (epsil * gamap1 - 1.) / (eps << 241 //
279 G4double sint = std::sqrt((1. + cost) * (1. << 242
>> 243 G4double cost = (epsil*gamap1-1.)/(epsil*sqg2m1);
>> 244 G4double sint = std::sqrt((1.+cost)*(1.-cost));
280 G4double phi = 0.; 245 G4double phi = 0.;
281 G4double beamTrans = << 246 G4double beamTrans = std::sqrt(sqr(theBeamPolarization.p1()) + sqr(theBeamPolarization.p2()));
282 std::sqrt(sqr(fBeamPolarization.p1()) + sq << 247 G4double targetTrans = std::sqrt(sqr(theTargetPolarization.p1()) + sqr(theTargetPolarization.p2()));
283 G4double targetTrans = <<
284 std::sqrt(sqr(fTargetPolarization.p1()) + <<
285 <<
286 do <<
287 { <<
288 phi = twopi * G4UniformRand(); <<
289 fCrossSectionCalculator->Initialize(epsil, <<
290 fTarge <<
291 <<
292 G4double gdiced = fCrossSectionCalculator- <<
293 gdiced += fCrossSectionCalculator->getVar( <<
294 fTargetPolarization.p3(); <<
295 gdiced += 1. * <<
296 (std::fabs(fCrossSectionCalculat <<
297 std::fabs(fCrossSectionCalculat <<
298 beamTrans * targetTrans; <<
299 gdiced += 1. * std::fabs(fCrossSectionCalc <<
300 (std::fabs(fBeamPolarization.p3( <<
301 std::fabs(fTargetPolarization.p <<
302 <<
303 G4double gdist = fCrossSectionCalculator-> <<
304 gdist += fCrossSectionCalculator->getVar(3 <<
305 fTargetPolarization.p3(); <<
306 gdist += fCrossSectionCalculator->getVar(1 <<
307 (std::cos(phi) * fBeamPolarizatio <<
308 std::sin(phi) * fBeamPolarizatio <<
309 (std::cos(phi) * fTargetPolarizat <<
310 std::sin(phi) * fTargetPolarizat <<
311 gdist += fCrossSectionCalculator->getVar(2 <<
312 (std::cos(phi) * fBeamPolarizatio <<
313 std::sin(phi) * fBeamPolarizatio <<
314 (std::cos(phi) * fTargetPolarizat <<
315 std::sin(phi) * fTargetPolarizat <<
316 gdist += <<
317 fCrossSectionCalculator->getVar(4) * <<
318 (std::cos(phi) * fBeamPolarization.p3() <<
319 std::cos(phi) * fBeamPolarization.p1() <<
320 std::sin(phi) * fBeamPolarization.p3() <<
321 std::sin(phi) * fBeamPolarization.p2() <<
322 <<
323 treject = gdist / gdiced; <<
324 if(treject > 1. + 1.e-10 || treject < 0) <<
325 { <<
326 G4ExceptionDescription ed; <<
327 ed << "!!!ERROR in PolarizedAnnihilation <<
328 << " phi rejection does not work prop <<
329 G4cout << " gdiced = " << gdiced << G4en <<
330 G4cout << " gdist = " << gdist << G4endl <<
331 G4cout << " epsil = " << epsil << G4endl <<
332 G4Exception("G4PolarizedAnnihilationMode <<
333 JustWarning, ed); <<
334 } <<
335 248
336 if(treject < 1.e-3) << 249 // G4cout<<"phi dicing START"<<G4endl;
337 { << 250 do{
338 G4ExceptionDescription ed; << 251 phi = twopi * G4UniformRand();
339 ed << "!!!ERROR in PolarizedAnnihilation << 252 crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,2);
340 << " phi rejection does not work prop << 253
341 G4cout << " gdiced=" << gdiced << " gd << 254 G4double gdiced =crossSectionCalculator->getVar(0);
342 G4cout << " epsil = " << epsil << G4endl << 255 gdiced += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3();
343 G4Exception("G4PolarizedAnnihilationMode << 256 gdiced += 1.*(std::fabs(crossSectionCalculator->getVar(1))
344 JustWarning, ed); << 257 + std::fabs(crossSectionCalculator->getVar(2)))*beamTrans*targetTrans;
345 } << 258 gdiced += 1.*std::fabs(crossSectionCalculator->getVar(4))
>> 259 *(std::fabs(theBeamPolarization.p3())*targetTrans + std::fabs(theTargetPolarization.p3())*beamTrans);
>> 260
>> 261 G4double gdist = crossSectionCalculator->getVar(0);
>> 262 gdist += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3();
>> 263 gdist += crossSectionCalculator->getVar(1)*(std::cos(phi)*theBeamPolarization.p1()
>> 264 + std::sin(phi)*theBeamPolarization.p2())
>> 265 *(std::cos(phi)*theTargetPolarization.p1()
>> 266 + std::sin(phi)*theTargetPolarization.p2());
>> 267 gdist += crossSectionCalculator->getVar(2)*(std::cos(phi)*theBeamPolarization.p2()
>> 268 - std::sin(phi)*theBeamPolarization.p1())
>> 269 *(std::cos(phi)*theTargetPolarization.p2()
>> 270 - std::sin(phi)*theTargetPolarization.p1());
>> 271 gdist += crossSectionCalculator->getVar(4)
>> 272 *(std::cos(phi)*theBeamPolarization.p3()*theTargetPolarization.p1()
>> 273 + std::cos(phi)*theBeamPolarization.p1()*theTargetPolarization.p3()
>> 274 + std::sin(phi)*theBeamPolarization.p3()*theTargetPolarization.p2()
>> 275 + std::sin(phi)*theBeamPolarization.p2()*theTargetPolarization.p3());
>> 276
>> 277 treject = gdist/gdiced;
>> 278 //G4cout<<" treject = "<<treject<<" at phi = "<<phi<<G4endl;
>> 279 if (treject>1.+1.e-10 || treject<0){
>> 280 G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
>> 281 <<" phi rejection does not work properly: "<<treject<<G4endl;
>> 282 G4cout<<" gdiced = "<<gdiced<<G4endl;
>> 283 G4cout<<" gdist = "<<gdist<<G4endl;
>> 284 G4cout<<" epsil = "<<epsil<<G4endl;
>> 285 }
>> 286
>> 287 if (treject<1.e-3) {
>> 288 G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
>> 289 <<" phi rejection does not work properly: "<<treject<<"\n";
>> 290 G4cout<<" gdiced="<<gdiced<<" gdist="<<gdist<<"\n";
>> 291 G4cout<<" epsil = "<<epsil<<G4endl;
>> 292 }
346 293
347 // Loop checking, 03-Aug-2015, Vladimir Iv << 294 } while( treject < G4UniformRand() );
348 } while(treject < G4UniformRand()); << 295 // G4cout<<"phi dicing END"<<G4endl;
349 296
350 G4double dirx = sint * std::cos(phi); << 297 G4double dirx = sint*std::cos(phi) , diry = sint*std::sin(phi) , dirz = cost;
351 G4double diry = sint * std::sin(phi); <<
352 G4double dirz = cost; <<
353 298
>> 299 //
354 // kinematic of the created pair 300 // kinematic of the created pair
355 G4double TotalAvailableEnergy = PositKinEner << 301 //
356 G4double Phot1Energy = epsil * Tota << 302 G4double TotalAvailableEnergy = PositKinEnergy + 2*electron_mass_c2;
357 G4double Phot2Energy = (1. - epsil) << 303 G4double Phot1Energy = epsil*TotalAvailableEnergy;
>> 304 G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
358 305
359 // *** prepare calculation of polarization t 306 // *** prepare calculation of polarization transfer ***
360 G4ThreeVector Phot1Direction(dirx, diry, dir << 307 G4ThreeVector Phot1Direction (dirx, diry, dirz);
361 308
362 // get interaction frame 309 // get interaction frame
363 G4ThreeVector nInteractionFrame = << 310 G4ThreeVector nInteractionFrame =
364 G4PolarizationHelper::GetFrame(PositDirect << 311 G4PolarizationHelper::GetFrame(PositDirection,Phot1Direction);
365 << 312
366 // define proper in-plane and out-of-plane c 313 // define proper in-plane and out-of-plane component of initial spins
367 fBeamPolarization.InvRotateAz(nInteractionFr << 314 theBeamPolarization.InvRotateAz(nInteractionFrame,PositDirection);
368 fTargetPolarization.InvRotateAz(nInteraction << 315 theTargetPolarization.InvRotateAz(nInteractionFrame,PositDirection);
369 316
370 // calculate spin transfere matrix 317 // calculate spin transfere matrix
371 318
372 fCrossSectionCalculator->Initialize(epsil, g << 319 crossSectionCalculator->Initialize(epsil,gama,phi,theBeamPolarization,theTargetPolarization,2);
373 fTargetP <<
374 320
375 Phot1Direction.rotateUz(PositDirection); << 321 // **********************************************************************
376 // create G4DynamicParticle object for the p << 322
377 G4DynamicParticle* aParticle1 = << 323 Phot1Direction.rotateUz(PositDirection);
378 new G4DynamicParticle(G4Gamma::Gamma(), Ph << 324 // create G4DynamicParticle object for the particle1
379 fFinalGamma1Polarization = fCrossSectionCalc << 325 G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(),
380 G4double n1 = fFinalGamma1Polar << 326 Phot1Direction, Phot1Energy);
381 if(n1 > 1.) << 327 finalGamma1Polarization=crossSectionCalculator->GetPol2();
382 { << 328 G4double n1=finalGamma1Polarization.mag2();
383 G4ExceptionDescription ed; << 329 if (n1>1) {
384 ed << "ERROR: PolarizedAnnihilation Polari << 330 G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = "
385 << epsil << " is too large!!! \n" << 331 <<epsil<<" is too large!!! \n"
386 << "annihi pol1= " << fFinalGamma1Polar << 332 <<"annihi pol1= "<<finalGamma1Polarization<<", ("<<n1<<")\n";
387 fFinalGamma1Polarization *= 1. / std::sqrt << 333 finalGamma1Polarization+=1./std::sqrt(n1);
388 G4Exception("G4PolarizedAnnihilationModel: <<
389 JustWarning, ed); <<
390 } 334 }
391 335
392 // define polarization of first final state 336 // define polarization of first final state photon
393 fFinalGamma1Polarization.SetPhoton(); << 337 finalGamma1Polarization.SetPhoton();
394 fFinalGamma1Polarization.RotateAz(nInteracti << 338 finalGamma1Polarization.RotateAz(nInteractionFrame,Phot1Direction);
395 aParticle1->SetPolarization(fFinalGamma1Pola << 339 aParticle1->SetPolarization(finalGamma1Polarization.p1(),
396 fFinalGamma1Pola << 340 finalGamma1Polarization.p2(),
397 fFinalGamma1Pola << 341 finalGamma1Polarization.p3());
398 342
399 fvect->push_back(aParticle1); 343 fvect->push_back(aParticle1);
400 344
>> 345
401 // ***************************************** 346 // **********************************************************************
402 347
403 G4double Eratio = Phot1Energy / Phot2Energy; << 348 G4double Eratio= Phot1Energy/Phot2Energy;
404 G4double PositP = << 349 G4double PositP= std::sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
405 std::sqrt(PositKinEnergy * (PositKinEnergy << 350 G4ThreeVector Phot2Direction (-dirx*Eratio, -diry*Eratio,
406 G4ThreeVector Phot2Direction(-dirx * Eratio, << 351 (PositP-dirz*Phot1Energy)/Phot2Energy);
407 (PositP - dirz << 352 Phot2Direction.rotateUz(PositDirection);
408 Phot2Direction.rotateUz(PositDirection); << 353 // create G4DynamicParticle object for the particle2
409 // create G4DynamicParticle object for the p << 354 G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(),
410 G4DynamicParticle* aParticle2 = << 355 Phot2Direction, Phot2Energy);
411 new G4DynamicParticle(G4Gamma::Gamma(), Ph <<
412 356
413 // define polarization of second final state 357 // define polarization of second final state photon
414 fFinalGamma2Polarization = fCrossSectionCalc << 358 finalGamma2Polarization=crossSectionCalculator->GetPol3();
415 G4double n2 = fFinalGamma2Polar << 359 G4double n2=finalGamma2Polarization.mag2();
416 if(n2 > 1.) << 360 if (n2>1) {
417 { << 361 G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = "<<epsil<<" is too large!!! \n";
418 G4ExceptionDescription ed; << 362 G4cout<<"annihi pol2= "<<finalGamma2Polarization<<", ("<<n2<<")\n";
419 ed << "ERROR: PolarizedAnnihilation Polari << 363
420 << epsil << " is too large!!! \n"; << 364 finalGamma2Polarization+=1./std::sqrt(n2);
421 ed << "annihi pol2= " << fFinalGamma2Polar <<
422 <<
423 G4Exception("G4PolarizedAnnihilationModel: <<
424 JustWarning, ed); <<
425 fFinalGamma2Polarization *= 1. / std::sqrt <<
426 } 365 }
427 fFinalGamma2Polarization.SetPhoton(); << 366 finalGamma2Polarization.SetPhoton();
428 fFinalGamma2Polarization.RotateAz(nInteracti << 367 finalGamma2Polarization.RotateAz(nInteractionFrame,Phot2Direction);
429 aParticle2->SetPolarization(fFinalGamma2Pola << 368 aParticle2->SetPolarization(finalGamma2Polarization.p1(),
430 fFinalGamma2Pola << 369 finalGamma2Polarization.p2(),
431 fFinalGamma2Pola << 370 finalGamma2Polarization.p3());
432 371
433 fvect->push_back(aParticle2); 372 fvect->push_back(aParticle2);
>> 373
>> 374 return fvect;
434 } 375 }
435 376