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25 // 25 //
>> 26 // $Id: G4PolarizedAnnihilationModel.cc,v 1.9 2009/11/12 12:57:15 schaelic Exp $
>> 27 // GEANT4 tag $Name: geant4-09-03-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 // 10-07-07 copied Initialise() method from G4eeToTwoGammaModel to provide a
>> 45 // local ParticleChangeForGamma object and reduce overhead
>> 46 // in SampleSecondaries() (A. Schaelicke)
>> 47 //
>> 48 //
34 // Class Description: 49 // Class Description:
35 // Implementation of polarized gamma Annihil << 50 //
>> 51 // Implementation of polarized gamma Annihilation scattering on free electron
>> 52 //
36 53
>> 54 // -------------------------------------------------------------------
37 #include "G4PolarizedAnnihilationModel.hh" 55 #include "G4PolarizedAnnihilationModel.hh"
38 <<
39 #include "G4Gamma.hh" <<
40 #include "G4ParticleChangeForGamma.hh" <<
41 #include "G4PhysicalConstants.hh" <<
42 #include "G4PolarizationHelper.hh" <<
43 #include "G4PolarizationManager.hh" 56 #include "G4PolarizationManager.hh"
44 #include "G4PolarizedAnnihilationXS.hh" << 57 #include "G4PolarizationHelper.hh"
45 #include "G4StokesVector.hh" 58 #include "G4StokesVector.hh"
>> 59 #include "G4PolarizedAnnihilationCrossSection.hh"
>> 60 #include "G4ParticleChangeForGamma.hh"
46 #include "G4TrackStatus.hh" 61 #include "G4TrackStatus.hh"
>> 62 #include "G4Gamma.hh"
47 63
48 G4PolarizedAnnihilationModel::G4PolarizedAnnih << 64 G4PolarizedAnnihilationModel::G4PolarizedAnnihilationModel(const G4ParticleDefinition* p,
49 const G4ParticleDefinition* p, const G4Strin << 65 const G4String& nam)
50 : G4eeToTwoGammaModel(p, nam) << 66 : G4eeToTwoGammaModel(p,nam),crossSectionCalculator(0),gParticleChange(0),
51 , fCrossSectionCalculator(nullptr) << 67 gIsInitialised(false)
52 , fParticleChange(nullptr) <<
53 , fVerboseLevel(0) <<
54 { 68 {
55 fCrossSectionCalculator = new G4PolarizedAn << 69 crossSectionCalculator=new G4PolarizedAnnihilationCrossSection();
56 fBeamPolarization = G4StokesVector::Z <<
57 fTargetPolarization = G4StokesVector::Z <<
58 fFinalGamma1Polarization = G4StokesVector::Z <<
59 fFinalGamma2Polarization = G4StokesVector::Z <<
60 } 70 }
61 71
62 //....oooOO0OOooo........oooOO0OOooo........oo <<
63 G4PolarizedAnnihilationModel::~G4PolarizedAnni 72 G4PolarizedAnnihilationModel::~G4PolarizedAnnihilationModel()
64 { 73 {
65 delete fCrossSectionCalculator; << 74 if (crossSectionCalculator) delete crossSectionCalculator;
66 } 75 }
67 76
>> 77
68 //....oooOO0OOooo........oooOO0OOooo........oo 78 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
69 void G4PolarizedAnnihilationModel::Initialise( << 79
70 << 80 void G4PolarizedAnnihilationModel::Initialise(const G4ParticleDefinition*,
>> 81 const G4DataVector&)
71 { 82 {
72 G4eeToTwoGammaModel::Initialise(part, dv); << 83 // G4eeToTwoGammaModel::Initialise(part,dv);
73 if(fParticleChange) << 84 if(gIsInitialised) return;
74 { << 85 gParticleChange = GetParticleChangeForGamma();
75 return; << 86 gIsInitialised = true;
76 } <<
77 fParticleChange = GetParticleChangeForGamma( <<
78 } 87 }
79 88
80 //....oooOO0OOooo........oooOO0OOooo........oo <<
81 G4double G4PolarizedAnnihilationModel::Compute 89 G4double G4PolarizedAnnihilationModel::ComputeCrossSectionPerElectron(
82 G4double kinEnergy) << 90 const G4ParticleDefinition* pd,
>> 91 G4double kinEnergy,
>> 92 G4double cut,
>> 93 G4double emax)
83 { 94 {
84 // cross section from base model << 95 G4double xs = G4eeToTwoGammaModel::ComputeCrossSectionPerElectron(pd,kinEnergy,
85 G4double xs = G4eeToTwoGammaModel::ComputeCr << 96 cut,emax);
86 97
87 G4double polzz = fBeamPolarization.z() * fTa << 98 G4double polzz = theBeamPolarization.z()*theTargetPolarization.z();
88 G4double poltt = fBeamPolarization.x() * fTa << 99 G4double poltt = theBeamPolarization.x()*theTargetPolarization.x()
89 fBeamPolarization.y() * fTa << 100 + theBeamPolarization.y()*theTargetPolarization.y();
90 if(polzz != 0 || poltt != 0) << 101 if (polzz!=0 || poltt!=0) {
91 { << 102 G4double xval,lasym,tasym;
92 G4double xval, lasym, tasym; << 103 ComputeAsymmetriesPerElectron(kinEnergy,xval,lasym,tasym);
93 ComputeAsymmetriesPerElectron(kinEnergy, x << 104 xs*=(1.+polzz*lasym+poltt*tasym);
94 xs *= (1. + polzz * lasym + poltt * tasym) <<
95 } 105 }
96 106
97 return xs; 107 return xs;
98 } 108 }
99 109
100 //....oooOO0OOooo........oooOO0OOooo........oo << 110 void G4PolarizedAnnihilationModel::ComputeAsymmetriesPerElectron(G4double ene,
101 void G4PolarizedAnnihilationModel::ComputeAsym << 111 G4double & valueX,
102 G4double ene, G4double& valueX, G4double& va << 112 G4double & valueA,
>> 113 G4double & valueT)
103 { 114 {
104 // *** calculate asymmetries 115 // *** calculate asymmetries
105 G4double gam = 1. + ene / electron_mass_c2; << 116 G4double gam = 1. + ene/electron_mass_c2;
106 G4double xs0 = fCrossSectionCalculator->Tota << 117 G4double xs0=crossSectionCalculator->TotalXSection(0.,1.,gam,
107 0., 1., gam, G4StokesVector::ZERO, G4Stoke << 118 G4StokesVector::ZERO,
108 G4double xsA = fCrossSectionCalculator->Tota << 119 G4StokesVector::ZERO);
109 0., 1., gam, G4StokesVector::P3, G4StokesV << 120 G4double xsA=crossSectionCalculator->TotalXSection(0.,1.,gam,
110 G4double xsT1 = fCrossSectionCalculator->Tot << 121 G4StokesVector::P3,
111 0., 1., gam, G4StokesVector::P1, G4StokesV << 122 G4StokesVector::P3);
112 G4double xsT2 = fCrossSectionCalculator->Tot << 123 G4double xsT1=crossSectionCalculator->TotalXSection(0.,1.,gam,
113 0., 1., gam, G4StokesVector::P2, G4StokesV << 124 G4StokesVector::P1,
114 G4double xsT = 0.5 * (xsT1 + xsT2); << 125 G4StokesVector::P1);
115 << 126 G4double xsT2=crossSectionCalculator->TotalXSection(0.,1.,gam,
116 valueX = xs0; << 127 G4StokesVector::P2,
117 valueA = xsA / xs0 - 1.; << 128 G4StokesVector::P2);
118 valueT = xsT / xs0 - 1.; << 129 G4double xsT=0.5*(xsT1+xsT2);
119 << 130
120 if((valueA < -1) || (1 < valueA)) << 131 valueX=xs0;
121 { << 132 valueA=xsA/xs0-1.;
122 G4ExceptionDescription ed; << 133 valueT=xsT/xs0-1.;
123 ed << " ERROR PolarizedAnnihilationPS::Com << 134 // G4cout<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl;
124 ed << " something wrong in total cross sec << 135 if ( (valueA < -1) || (1 < valueA)) {
125 ed << " LONG: " << valueX << "\t" << value << 136 G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
126 << " energy = " << gam << G4endl; << 137 G4cout<< " something wrong in total cross section calculation (valueA)\n";
127 G4Exception("G4PolarizedAnnihilationModel: << 138 G4cout<<"*********** LONG "<<valueX<<"\t"<<valueA<<"\t"<<valueT<<" energy = "<<gam<<G4endl;
128 "pol004", JustWarning, ed); <<
129 } 139 }
130 if((valueT < -1) || (1 < valueT)) << 140 if ( (valueT < -1) || (1 < valueT)) {
131 { << 141 G4cout<< " ERROR PolarizedAnnihilationPS::ComputeAsymmetries \n";
132 G4ExceptionDescription ed; << 142 G4cout<< " something wrong in total cross section calculation (valueT)\n";
133 ed << " ERROR PolarizedAnnihilationPS::Com << 143 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 } 144 }
140 } 145 }
141 146
142 void G4PolarizedAnnihilationModel::SampleSecon <<
143 std::vector<G4DynamicParticle*>* fvect, cons <<
144 const G4DynamicParticle* dp, G4double, G4dou <<
145 { <<
146 const G4Track* aTrack = fParticleChange->Get <<
147 147
148 // kill primary << 148 void G4PolarizedAnnihilationModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect,
149 fParticleChange->SetProposedKineticEnergy(0. << 149 const G4MaterialCutsCouple* /*couple*/,
150 fParticleChange->ProposeTrackStatus(fStopAnd << 150 const G4DynamicParticle* dp,
>> 151 G4double /*tmin*/,
>> 152 G4double /*maxEnergy*/)
>> 153 {
>> 154 // G4ParticleChangeForGamma* gParticleChange
>> 155 // = dynamic_cast<G4ParticleChangeForGamma*>(pParticleChange);
>> 156 const G4Track * aTrack = gParticleChange->GetCurrentTrack();
>> 157
>> 158 // kill primary
>> 159 gParticleChange->SetProposedKineticEnergy(0.);
>> 160 gParticleChange->ProposeTrackStatus(fStopAndKill);
151 161
152 // V.Ivanchenko add protection against zero 162 // V.Ivanchenko add protection against zero kin energy
153 G4double PositKinEnergy = dp->GetKineticEner 163 G4double PositKinEnergy = dp->GetKineticEnergy();
154 164
155 if(PositKinEnergy == 0.0) << 165 if(PositKinEnergy < DBL_MIN) {
156 { << 166
157 G4double cosTeta = 2. * G4UniformRand() - << 167 G4double cosTeta = 2.*G4UniformRand()-1.;
158 G4double sinTeta = std::sqrt((1.0 - cosTet << 168 G4double sinTeta = std::sqrt((1.0 - cosTeta)*(1.0 + cosTeta));
159 G4double phi = twopi * G4UniformRand() 169 G4double phi = twopi * G4UniformRand();
160 G4ThreeVector dir(sinTeta * std::cos(phi), << 170 G4ThreeVector dir(sinTeta*std::cos(phi), sinTeta*std::sin(phi), cosTeta);
161 cosTeta); << 171 fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(), dir, electron_mass_c2));
162 fvect->push_back( << 172 fvect->push_back( new G4DynamicParticle(G4Gamma::Gamma(),-dir, electron_mass_c2));
163 new G4DynamicParticle(G4Gamma::Gamma(), <<
164 fvect->push_back( <<
165 new G4DynamicParticle(G4Gamma::Gamma(), <<
166 return; 173 return;
167 } 174 }
168 175
169 // *** obtain and save target and beam polar 176 // *** obtain and save target and beam polarization ***
170 G4PolarizationManager* polarizationManager = << 177 G4PolarizationManager * polarizationManager = G4PolarizationManager::GetInstance();
171 G4PolarizationManager::GetInstance(); <<
172 178
173 // obtain polarization of the beam 179 // obtain polarization of the beam
174 fBeamPolarization = G4StokesVector(aTrack->G << 180 theBeamPolarization = aTrack->GetPolarization();
175 181
176 // obtain polarization of the media 182 // obtain polarization of the media
177 G4VPhysicalVolume* aPVolume = aTrack->Get << 183 G4VPhysicalVolume* aPVolume = aTrack->GetVolume();
178 G4LogicalVolume* aLVolume = aPVolume->G << 184 G4LogicalVolume* aLVolume = aPVolume->GetLogicalVolume();
179 const G4bool targetIsPolarized = polarizatio 185 const G4bool targetIsPolarized = polarizationManager->IsPolarized(aLVolume);
180 fTargetPolarization = polarizationManager->G << 186 theTargetPolarization = polarizationManager->GetVolumePolarization(aLVolume);
181 <<
182 if(fVerboseLevel >= 1) <<
183 { <<
184 G4cout << "G4PolarizedComptonModel::Sample <<
185 << aLVolume->GetName() << G4endl; <<
186 } <<
187 187
188 // transfer target electron polarization in 188 // transfer target electron polarization in frame of positron
189 if(targetIsPolarized) << 189 if (targetIsPolarized)
190 fTargetPolarization.rotateUz(dp->GetMoment << 190 theTargetPolarization.rotateUz(dp->GetMomentumDirection());
191 << 191
192 G4ParticleMomentum PositDirection = dp->GetM 192 G4ParticleMomentum PositDirection = dp->GetMomentumDirection();
193 193
194 // polar asymmetry: 194 // polar asymmetry:
195 G4double polarization = fBeamPolarization.p3 << 195 G4double polarization = theBeamPolarization.p3()*theTargetPolarization.p3();
196 196
197 G4double gamam1 = PositKinEnergy / electron_ << 197 G4double gamam1 = PositKinEnergy/electron_mass_c2;
198 G4double gama = gamam1 + 1., gamap1 = gamam1 << 198 G4double gama = gamam1+1. , gamap1 = gamam1+2.;
199 G4double sqgrate = std::sqrt(gamam1 / gamap1 << 199 G4double sqgrate = std::sqrt(gamam1/gamap1)/2. , sqg2m1 = std::sqrt(gamam1*gamap1);
200 sqg2m1 = std::sqrt(gamam1 * gamap1 <<
201 200
202 // limits of the energy sampling 201 // limits of the energy sampling
203 G4double epsilmin = 0.5 - sqgrate, epsilmax << 202 G4double epsilmin = 0.5 - sqgrate , epsilmax = 0.5 + sqgrate;
204 G4double epsilqot = epsilmax / epsilmin; << 203 G4double epsilqot = epsilmax/epsilmin;
205 << 204
206 // sample the energy rate of the created gam << 205 //
207 // note: for polarized partices, the actual << 206 // sample the energy rate of the created gammas
>> 207 // note: for polarized partices, the actual dicing strategy
208 // will depend on the energy, and the 208 // will depend on the energy, and the degree of polarization !!
>> 209 //
209 G4double epsil; 210 G4double epsil;
210 G4double gmax = 1. + std::fabs(polarization) << 211 G4double gmax=1. + std::fabs(polarization); // crude estimate
211 212
212 fCrossSectionCalculator->Initialize(epsilmin << 213 G4bool check_range=true;
213 fTargetP << 214
214 if(fCrossSectionCalculator->DiceEpsilon() < << 215 crossSectionCalculator->Initialize(epsilmin, gama, 0., theBeamPolarization, theTargetPolarization);
215 { << 216 if (crossSectionCalculator->DiceEpsilon()<0) {
216 G4ExceptionDescription ed; << 217 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
217 ed << "ERROR in PolarizedAnnihilationPS::P << 218 <<"epsilmin DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl;
218 << "epsilmin DiceRoutine not appropriat << 219 check_range=false;
219 << fCrossSectionCalculator->DiceEpsilon <<
220 G4Exception("G4PolarizedAnnihilationModel: <<
221 JustWarning, ed); <<
222 } 220 }
223 221
224 fCrossSectionCalculator->Initialize(epsilmax << 222 crossSectionCalculator->Initialize(epsilmax, gama, 0., theBeamPolarization, theTargetPolarization);
225 fTargetP << 223 if (crossSectionCalculator->DiceEpsilon()<0) {
226 if(fCrossSectionCalculator->DiceEpsilon() < << 224 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
227 { << 225 <<"epsilmax DiceRoutine not appropriate ! "<<crossSectionCalculator->DiceEpsilon()<<G4endl;
228 G4ExceptionDescription ed; << 226 check_range=false;
229 ed << "ERROR in PolarizedAnnihilationPS::P <<
230 << "epsilmax DiceRoutine not appropriat <<
231 << fCrossSectionCalculator->DiceEpsilon <<
232 G4Exception("G4PolarizedAnnihilationModel: <<
233 JustWarning, ed); <<
234 } 227 }
235 228
236 G4int ncount = 0; << 229 G4int ncount=0;
237 G4double trejectmax = 0.; << 230 G4double trejectmax=0.;
238 G4double treject; 231 G4double treject;
239 232
240 do << 233
241 { << 234 do {
242 epsil = epsilmin * std::pow(epsilqot, G4Un << 235 //
243 << 236 epsil = epsilmin*std::pow(epsilqot,G4UniformRand());
244 fCrossSectionCalculator->Initialize(epsil, << 237
245 fTarge << 238 crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,1);
246 << 239
247 treject = fCrossSectionCalculator->DiceEps << 240 treject = crossSectionCalculator->DiceEpsilon();
248 treject *= epsil; << 241 treject*=epsil;
249 << 242
250 if(treject > gmax || treject < 0.) << 243 if (treject>gmax || treject<0.)
251 { << 244 G4cout<<"ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
252 G4ExceptionDescription ed; << 245 <<" 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; 246 ++ncount;
260 if(treject > trejectmax) << 247 if (treject>trejectmax) trejectmax=treject;
261 trejectmax = treject; << 248 if (ncount>1000) {
262 if(ncount > 1000) << 249 G4cout<<"WARNING in PolarizedAnnihilationPS::PostStepDoIt\n"
263 { << 250 <<"eps dicing very inefficient ="<<trejectmax/gmax
264 G4ExceptionDescription ed; << 251 <<", "<<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; 252 break;
272 } 253 }
273 254
274 // Loop checking, 03-Aug-2015, Vladimir Iv << 255 } while( treject < gmax*G4UniformRand() );
275 } while(treject < gmax * G4UniformRand()); <<
276 256
>> 257 //
277 // scattered Gamma angles. ( Z - axis along 258 // scattered Gamma angles. ( Z - axis along the parent positron)
278 G4double cost = (epsil * gamap1 - 1.) / (eps << 259 //
279 G4double sint = std::sqrt((1. + cost) * (1. << 260
>> 261 G4double cost = (epsil*gamap1-1.)/(epsil*sqg2m1);
>> 262 G4double sint = std::sqrt((1.+cost)*(1.-cost));
280 G4double phi = 0.; 263 G4double phi = 0.;
281 G4double beamTrans = << 264 G4double beamTrans = std::sqrt(sqr(theBeamPolarization.p1()) + sqr(theBeamPolarization.p2()));
282 std::sqrt(sqr(fBeamPolarization.p1()) + sq << 265 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 } <<
335 266
336 if(treject < 1.e-3) << 267 // G4cout<<"phi dicing START"<<G4endl;
337 { << 268 do{
338 G4ExceptionDescription ed; << 269 phi = twopi * G4UniformRand();
339 ed << "!!!ERROR in PolarizedAnnihilation << 270 crossSectionCalculator->Initialize(epsil, gama, 0., theBeamPolarization, theTargetPolarization,2);
340 << " phi rejection does not work prop << 271
341 G4cout << " gdiced=" << gdiced << " gd << 272 G4double gdiced =crossSectionCalculator->getVar(0);
342 G4cout << " epsil = " << epsil << G4endl << 273 gdiced += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3();
343 G4Exception("G4PolarizedAnnihilationMode << 274 gdiced += 1.*(std::fabs(crossSectionCalculator->getVar(1))
344 JustWarning, ed); << 275 + std::fabs(crossSectionCalculator->getVar(2)))*beamTrans*targetTrans;
345 } << 276 gdiced += 1.*std::fabs(crossSectionCalculator->getVar(4))
>> 277 *(std::fabs(theBeamPolarization.p3())*targetTrans + std::fabs(theTargetPolarization.p3())*beamTrans);
>> 278
>> 279 G4double gdist = crossSectionCalculator->getVar(0);
>> 280 gdist += crossSectionCalculator->getVar(3)*theBeamPolarization.p3()*theTargetPolarization.p3();
>> 281 gdist += crossSectionCalculator->getVar(1)*(std::cos(phi)*theBeamPolarization.p1()
>> 282 + std::sin(phi)*theBeamPolarization.p2())
>> 283 *(std::cos(phi)*theTargetPolarization.p1()
>> 284 + std::sin(phi)*theTargetPolarization.p2());
>> 285 gdist += crossSectionCalculator->getVar(2)*(std::cos(phi)*theBeamPolarization.p2()
>> 286 - std::sin(phi)*theBeamPolarization.p1())
>> 287 *(std::cos(phi)*theTargetPolarization.p2()
>> 288 - std::sin(phi)*theTargetPolarization.p1());
>> 289 gdist += crossSectionCalculator->getVar(4)
>> 290 *(std::cos(phi)*theBeamPolarization.p3()*theTargetPolarization.p1()
>> 291 + std::cos(phi)*theBeamPolarization.p1()*theTargetPolarization.p3()
>> 292 + std::sin(phi)*theBeamPolarization.p3()*theTargetPolarization.p2()
>> 293 + std::sin(phi)*theBeamPolarization.p2()*theTargetPolarization.p3());
>> 294
>> 295 treject = gdist/gdiced;
>> 296 //G4cout<<" treject = "<<treject<<" at phi = "<<phi<<G4endl;
>> 297 if (treject>1.+1.e-10 || treject<0){
>> 298 G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
>> 299 <<" phi rejection does not work properly: "<<treject<<G4endl;
>> 300 G4cout<<" gdiced = "<<gdiced<<G4endl;
>> 301 G4cout<<" gdist = "<<gdist<<G4endl;
>> 302 G4cout<<" epsil = "<<epsil<<G4endl;
>> 303 }
>> 304
>> 305 if (treject<1.e-3) {
>> 306 G4cout<<"!!!ERROR in PolarizedAnnihilationPS::PostStepDoIt\n"
>> 307 <<" phi rejection does not work properly: "<<treject<<"\n";
>> 308 G4cout<<" gdiced="<<gdiced<<" gdist="<<gdist<<"\n";
>> 309 G4cout<<" epsil = "<<epsil<<G4endl;
>> 310 }
346 311
347 // Loop checking, 03-Aug-2015, Vladimir Iv << 312 } while( treject < G4UniformRand() );
348 } while(treject < G4UniformRand()); << 313 // G4cout<<"phi dicing END"<<G4endl;
349 314
350 G4double dirx = sint * std::cos(phi); << 315 G4double dirx = sint*std::cos(phi) , diry = sint*std::sin(phi) , dirz = cost;
351 G4double diry = sint * std::sin(phi); <<
352 G4double dirz = cost; <<
353 316
>> 317 //
354 // kinematic of the created pair 318 // kinematic of the created pair
355 G4double TotalAvailableEnergy = PositKinEner << 319 //
356 G4double Phot1Energy = epsil * Tota << 320 G4double TotalAvailableEnergy = PositKinEnergy + 2*electron_mass_c2;
357 G4double Phot2Energy = (1. - epsil) << 321 G4double Phot1Energy = epsil*TotalAvailableEnergy;
>> 322 G4double Phot2Energy =(1.-epsil)*TotalAvailableEnergy;
358 323
359 // *** prepare calculation of polarization t 324 // *** prepare calculation of polarization transfer ***
360 G4ThreeVector Phot1Direction(dirx, diry, dir << 325 G4ThreeVector Phot1Direction (dirx, diry, dirz);
361 326
362 // get interaction frame 327 // get interaction frame
363 G4ThreeVector nInteractionFrame = << 328 G4ThreeVector nInteractionFrame =
364 G4PolarizationHelper::GetFrame(PositDirect << 329 G4PolarizationHelper::GetFrame(PositDirection,Phot1Direction);
365 << 330
366 // define proper in-plane and out-of-plane c 331 // define proper in-plane and out-of-plane component of initial spins
367 fBeamPolarization.InvRotateAz(nInteractionFr << 332 theBeamPolarization.InvRotateAz(nInteractionFrame,PositDirection);
368 fTargetPolarization.InvRotateAz(nInteraction << 333 theTargetPolarization.InvRotateAz(nInteractionFrame,PositDirection);
369 334
370 // calculate spin transfere matrix 335 // calculate spin transfere matrix
371 336
372 fCrossSectionCalculator->Initialize(epsil, g << 337 crossSectionCalculator->Initialize(epsil,gama,phi,theBeamPolarization,theTargetPolarization,2);
373 fTargetP << 338
>> 339 // **********************************************************************
374 340
375 Phot1Direction.rotateUz(PositDirection); << 341 Phot1Direction.rotateUz(PositDirection);
376 // create G4DynamicParticle object for the p << 342 // create G4DynamicParticle object for the particle1
377 G4DynamicParticle* aParticle1 = << 343 G4DynamicParticle* aParticle1= new G4DynamicParticle (G4Gamma::Gamma(),
378 new G4DynamicParticle(G4Gamma::Gamma(), Ph << 344 Phot1Direction, Phot1Energy);
379 fFinalGamma1Polarization = fCrossSectionCalc << 345 finalGamma1Polarization=crossSectionCalculator->GetPol2();
380 G4double n1 = fFinalGamma1Polar << 346 G4double n1=finalGamma1Polarization.mag2();
381 if(n1 > 1.) << 347 if (n1>1) {
382 { << 348 G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = "
383 G4ExceptionDescription ed; << 349 <<epsil<<" is too large!!! \n"
384 ed << "ERROR: PolarizedAnnihilation Polari << 350 <<"annihi pol1= "<<finalGamma1Polarization<<", ("<<n1<<")\n";
385 << epsil << " is too large!!! \n" << 351 finalGamma1Polarization*=1./std::sqrt(n1);
386 << "annihi pol1= " << fFinalGamma1Polar <<
387 fFinalGamma1Polarization *= 1. / std::sqrt <<
388 G4Exception("G4PolarizedAnnihilationModel: <<
389 JustWarning, ed); <<
390 } 352 }
391 353
392 // define polarization of first final state 354 // define polarization of first final state photon
393 fFinalGamma1Polarization.SetPhoton(); << 355 finalGamma1Polarization.SetPhoton();
394 fFinalGamma1Polarization.RotateAz(nInteracti << 356 finalGamma1Polarization.RotateAz(nInteractionFrame,Phot1Direction);
395 aParticle1->SetPolarization(fFinalGamma1Pola << 357 aParticle1->SetPolarization(finalGamma1Polarization.p1(),
396 fFinalGamma1Pola << 358 finalGamma1Polarization.p2(),
397 fFinalGamma1Pola << 359 finalGamma1Polarization.p3());
398 360
399 fvect->push_back(aParticle1); 361 fvect->push_back(aParticle1);
400 362
>> 363
401 // ***************************************** 364 // **********************************************************************
402 365
403 G4double Eratio = Phot1Energy / Phot2Energy; << 366 G4double Eratio= Phot1Energy/Phot2Energy;
404 G4double PositP = << 367 G4double PositP= std::sqrt(PositKinEnergy*(PositKinEnergy+2.*electron_mass_c2));
405 std::sqrt(PositKinEnergy * (PositKinEnergy << 368 G4ThreeVector Phot2Direction (-dirx*Eratio, -diry*Eratio,
406 G4ThreeVector Phot2Direction(-dirx * Eratio, << 369 (PositP-dirz*Phot1Energy)/Phot2Energy);
407 (PositP - dirz << 370 Phot2Direction.rotateUz(PositDirection);
408 Phot2Direction.rotateUz(PositDirection); << 371 // create G4DynamicParticle object for the particle2
409 // create G4DynamicParticle object for the p << 372 G4DynamicParticle* aParticle2= new G4DynamicParticle (G4Gamma::Gamma(),
410 G4DynamicParticle* aParticle2 = << 373 Phot2Direction, Phot2Energy);
411 new G4DynamicParticle(G4Gamma::Gamma(), Ph <<
412 374
413 // define polarization of second final state 375 // define polarization of second final state photon
414 fFinalGamma2Polarization = fCrossSectionCalc << 376 finalGamma2Polarization=crossSectionCalculator->GetPol3();
415 G4double n2 = fFinalGamma2Polar << 377 G4double n2=finalGamma2Polarization.mag2();
416 if(n2 > 1.) << 378 if (n2>1) {
417 { << 379 G4cout<<"ERROR: PolarizedAnnihilation Polarization Vector at epsil = "<<epsil<<" is too large!!! \n";
418 G4ExceptionDescription ed; << 380 G4cout<<"annihi pol2= "<<finalGamma2Polarization<<", ("<<n2<<")\n";
419 ed << "ERROR: PolarizedAnnihilation Polari << 381
420 << epsil << " is too large!!! \n"; << 382 finalGamma2Polarization*=1./std::sqrt(n2);
421 ed << "annihi pol2= " << fFinalGamma2Polar <<
422 <<
423 G4Exception("G4PolarizedAnnihilationModel: <<
424 JustWarning, ed); <<
425 fFinalGamma2Polarization *= 1. / std::sqrt <<
426 } 383 }
427 fFinalGamma2Polarization.SetPhoton(); << 384 finalGamma2Polarization.SetPhoton();
428 fFinalGamma2Polarization.RotateAz(nInteracti << 385 finalGamma2Polarization.RotateAz(nInteractionFrame,Phot2Direction);
429 aParticle2->SetPolarization(fFinalGamma2Pola << 386 aParticle2->SetPolarization(finalGamma2Polarization.p1(),
430 fFinalGamma2Pola << 387 finalGamma2Polarization.p2(),
431 fFinalGamma2Pola << 388 finalGamma2Polarization.p3());
432 389
433 fvect->push_back(aParticle2); 390 fvect->push_back(aParticle2);
434 } 391 }
435 392