| Geant4 Cross Reference |
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25 // 22 //
26 // ------------------------------------------- 23 // ------------------------------------------------------------
27 // GEANT 4 class header file 24 // GEANT 4 class header file
28 // 25 //
29 // History: 26 // History:
30 // 17 August 2004 P. Gumplinger, T. MacP 27 // 17 August 2004 P. Gumplinger, T. MacPhail
31 // 11 April 2008 Kamil Sedlak (PSI), To <<
32 // ------------------------------------------- 28 // ------------------------------------------------------------
33 // 29 //
34 #include "G4DecayWithSpin.hh" 30 #include "G4DecayWithSpin.hh"
35 31
36 #include "G4Step.hh" 32 #include "G4Step.hh"
37 #include "G4Track.hh" 33 #include "G4Track.hh"
38 #include "G4DecayTable.hh" 34 #include "G4DecayTable.hh"
39 #include "G4MuonDecayChannelWithSpin.hh" 35 #include "G4MuonDecayChannelWithSpin.hh"
40 36
41 #include "G4PhysicalConstants.hh" <<
42 #include "G4SystemOfUnits.hh" <<
43 #include "G4Vector3D.hh" 37 #include "G4Vector3D.hh"
44 38
45 #include "G4TransportationManager.hh" 39 #include "G4TransportationManager.hh"
46 #include "G4PropagatorInField.hh" 40 #include "G4PropagatorInField.hh"
47 #include "G4FieldManager.hh" 41 #include "G4FieldManager.hh"
48 #include "G4Field.hh" 42 #include "G4Field.hh"
49 43
50 #include "G4Transform3D.hh" 44 #include "G4Transform3D.hh"
51 45
52 G4DecayWithSpin::G4DecayWithSpin(const G4Strin << 46 G4DecayWithSpin::G4DecayWithSpin(const G4String& processName):G4Decay(processName){}
53 { <<
54 // set Process Sub Type <<
55 SetProcessSubType(static_cast<int>(DECAY_Wit <<
56 <<
57 } <<
58 47
59 G4DecayWithSpin::~G4DecayWithSpin(){} 48 G4DecayWithSpin::~G4DecayWithSpin(){}
60 49
61 G4VParticleChange* G4DecayWithSpin::PostStepDo << 50 G4VParticleChange* G4DecayWithSpin::DecayIt(const G4Track& aTrack, const G4Step& aStep)
62 { 51 {
63 if ( (aTrack.GetTrackStatus() == fStopButAli <<
64 (aTrack.GetTrackStatus() == fStopAndKil <<
65 fParticleChangeForDecay.Initialize(aTrack) <<
66 return &fParticleChangeForDecay; <<
67 } <<
68 52
69 // get particle 53 // get particle
70 const G4DynamicParticle* aParticle = aTrack. 54 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
71 const G4ParticleDefinition* aParticleDef = a << 55 G4ParticleDefinition* aParticleDef = aParticle->GetDefinition();
72 56
73 // get parent_polarization 57 // get parent_polarization
74 G4ThreeVector parent_polarization = aParticl 58 G4ThreeVector parent_polarization = aParticle->GetPolarization();
75 59
76 if(parent_polarization == G4ThreeVector(0,0, << 60 if(parent_polarization == G4ThreeVector(0,0,0))
>> 61 {
77 // Generate random polarization direction 62 // Generate random polarization direction
78 G4double cost = 1. - 2.*G4UniformRand(); <<
79 G4double sint = std::sqrt((1.-cost)*(1.+co <<
80 <<
81 G4double phi = twopi*G4UniformRand(); <<
82 G4double sinp = std::sin(phi); <<
83 G4double cosp = std::cos(phi); <<
84 <<
85 G4double px = sint*cosp; <<
86 G4double py = sint*sinp; <<
87 G4double pz = cost; <<
88 63
89 parent_polarization.setX(px); <<
90 parent_polarization.setY(py); <<
91 parent_polarization.setZ(pz); <<
92 } <<
93 <<
94 // decay table <<
95 G4DecayTable *decaytable = aParticleDef->Get <<
96 if (decaytable != nullptr) { <<
97 for (G4int ip=0; ip<decaytable->entries(); <<
98 decaytable->GetDecayChannel(ip)->SetPola <<
99 } <<
100 } <<
101 <<
102 G4ParticleChangeForDecay* pParticleChangeFor <<
103 pParticleChangeForDecay = (G4ParticleChangeF <<
104 pParticleChangeForDecay->ProposePolarization <<
105 <<
106 return pParticleChangeForDecay; <<
107 } <<
108 <<
109 G4VParticleChange* G4DecayWithSpin::AtRestDoIt <<
110 { <<
111 <<
112 // get particle <<
113 const G4DynamicParticle* aParticle = aTrack. <<
114 const G4ParticleDefinition* aParticleDef = a <<
115 <<
116 // get parent_polarization <<
117 G4ThreeVector parent_polarization = aParticl <<
118 <<
119 if(parent_polarization == G4ThreeVector(0,0, <<
120 // Generate random polarization direction <<
121 G4double cost = 1. - 2.*G4UniformRand(); 64 G4double cost = 1. - 2.*G4UniformRand();
122 G4double sint = std::sqrt((1.-cost)*(1.+co 65 G4double sint = std::sqrt((1.-cost)*(1.+cost));
123 66
124 G4double phi = twopi*G4UniformRand(); 67 G4double phi = twopi*G4UniformRand();
125 G4double sinp = std::sin(phi); 68 G4double sinp = std::sin(phi);
126 G4double cosp = std::cos(phi); 69 G4double cosp = std::cos(phi);
127 70
128 G4double px = sint*cosp; 71 G4double px = sint*cosp;
129 G4double py = sint*sinp; 72 G4double py = sint*sinp;
130 G4double pz = cost; 73 G4double pz = cost;
131 74
132 parent_polarization.setX(px); 75 parent_polarization.setX(px);
133 parent_polarization.setY(py); 76 parent_polarization.setY(py);
134 parent_polarization.setZ(pz); 77 parent_polarization.setZ(pz);
135 78
136 }else{ 79 }else{
137 80
138 G4FieldManager* fieldMgr = aStep.GetTrack( 81 G4FieldManager* fieldMgr = aStep.GetTrack()->GetVolume()->
139 GetLogica 82 GetLogicalVolume()->GetFieldManager();
140 if (fieldMgr == nullptr) { << 83
>> 84 if (!fieldMgr) {
141 G4TransportationManager *transportMgr = 85 G4TransportationManager *transportMgr =
142 G4TransportationManag 86 G4TransportationManager::GetTransportationManager();
143 G4PropagatorInField* fFieldPropagator = 87 G4PropagatorInField* fFieldPropagator =
144 transp 88 transportMgr->GetPropagatorInField();
145 if (fFieldPropagator) fieldMgr = 89 if (fFieldPropagator) fieldMgr =
146 fFieldPropag 90 fFieldPropagator->GetCurrentFieldManager();
147 } 91 }
148 92
149 const G4Field* field = nullptr; << 93 const G4Field* field = NULL;
150 if (fieldMgr != nullptr) field = fieldMgr- << 94 if(fieldMgr)field = fieldMgr->GetDetectorField();
>> 95
>> 96 if (field && !(fieldMgr->DoesFieldChangeEnergy())) {
151 97
152 if ( field != nullptr ) { <<
153 G4double point[4]; 98 G4double point[4];
154 point[0] = (aStep.GetPostStepPoint()->G 99 point[0] = (aStep.GetPostStepPoint()->GetPosition())[0];
155 point[1] = (aStep.GetPostStepPoint()->G 100 point[1] = (aStep.GetPostStepPoint()->GetPosition())[1];
156 point[2] = (aStep.GetPostStepPoint()->G 101 point[2] = (aStep.GetPostStepPoint()->GetPosition())[2];
157 point[3] = aTrack.GetGlobalTime(); 102 point[3] = aTrack.GetGlobalTime();
158 103
159 G4double fieldValue[6] ={ 0., 0., 0., 0 << 104 G4double fieldValue[3];
160 field -> GetFieldValue(point,fieldValue 105 field -> GetFieldValue(point,fieldValue);
>> 106
161 G4ThreeVector B(fieldValue[0],fieldValu 107 G4ThreeVector B(fieldValue[0],fieldValue[1],fieldValue[2]);
162 108
163 // Call the spin precession only for no << 109 parent_polarization = Spin_Precession(aStep,B,fRemainderLifeTime);
164 if (B.mag2() > 0.) parent_polarization <<
165 Spin_Precessi <<
166 110
167 } 111 }
168 } 112 }
169 113
170 // decay table 114 // decay table
171 G4DecayTable *decaytable = aParticleDef->Get 115 G4DecayTable *decaytable = aParticleDef->GetDecayTable();
172 if ( decaytable != nullptr) { << 116
173 for (G4int ip=0; ip<decaytable->entries(); << 117 if (decaytable) {
174 decaytable->GetDecayChannel(ip)->SetPola << 118 G4MuonDecayChannelWithSpin *decaychannel;
175 } << 119 decaychannel = (G4MuonDecayChannelWithSpin*)decaytable->SelectADecayChannel();
176 } << 120 if (decaychannel) decaychannel->SetPolarization(parent_polarization);
>> 121 }
177 122
178 G4ParticleChangeForDecay* pParticleChangeFor 123 G4ParticleChangeForDecay* pParticleChangeForDecay;
>> 124
179 pParticleChangeForDecay = (G4ParticleChangeF 125 pParticleChangeForDecay = (G4ParticleChangeForDecay*)G4Decay::DecayIt(aTrack,aStep);
>> 126
180 pParticleChangeForDecay->ProposePolarization 127 pParticleChangeForDecay->ProposePolarization(parent_polarization);
181 128
182 return pParticleChangeForDecay; 129 return pParticleChangeForDecay;
183 130
184 } 131 }
185 132
186 G4ThreeVector G4DecayWithSpin::Spin_Precession 133 G4ThreeVector G4DecayWithSpin::Spin_Precession( const G4Step& aStep,
187 G4Thre 134 G4ThreeVector B, G4double deltatime )
188 { 135 {
189 G4double Bnorm = std::sqrt(sqr(B[0]) + sqr( 136 G4double Bnorm = std::sqrt(sqr(B[0]) + sqr(B[1]) +sqr(B[2]) );
190 137
191 G4double q = aStep.GetTrack()->GetDefinition 138 G4double q = aStep.GetTrack()->GetDefinition()->GetPDGCharge();
192 G4double a = 1.165922e-3; 139 G4double a = 1.165922e-3;
193 G4double s_omega = 8.5062e+7*rad/(s*kilogaus 140 G4double s_omega = 8.5062e+7*rad/(s*kilogauss);
194 141
195 G4double omega = -(q*s_omega)*(1.+a) * Bnorm 142 G4double omega = -(q*s_omega)*(1.+a) * Bnorm;
196 143
197 G4double rotationangle = deltatime * omega; 144 G4double rotationangle = deltatime * omega;
198 145
199 G4Transform3D SpinRotation = G4Rotate3D(rota 146 G4Transform3D SpinRotation = G4Rotate3D(rotationangle,B.unit());
200 147
201 G4Vector3D Spin = aStep.GetTrack() -> GetPol 148 G4Vector3D Spin = aStep.GetTrack() -> GetPolarization();
202 149
203 G4Vector3D newSpin = SpinRotation * Spin; 150 G4Vector3D newSpin = SpinRotation * Spin;
204 151
205 #ifdef G4VERBOSE 152 #ifdef G4VERBOSE
206 if (GetVerboseLevel()>2) { << 153
207 G4double normspin = std::sqrt(Spin*Spin); << 154 // G4double normspin = std::sqrt(Spin*Spin);
208 G4double normnewspin = std::sqrt(newSpin*n << 155 // G4double normnewspin = std::sqrt(newSpin*newSpin);
209 //G4double cosalpha = Spin*newSpin/normspi << 156 // G4double cosalpha = Spin*newSpin/normspin/normnewspin;
210 //G4double alpha = std::acos(cosalpha); << 157 // G4double alpha = std::acos(cosalpha);
211 << 158
212 G4cout << "AT REST::: PARAMETERS " << G4en << 159 // G4cout<< "AT REST::: PARAMETERS\n"
213 G4cout << "Initial spin : " << Spin << G << 160 // << "Initial spin : " << Spin <<"\n"
214 G4cout << "Delta time : " << deltatime << 161 // << "Delta time : " << deltatime <<"\n"
215 G4cout << "Rotation angle: " << rotationan << 162 // << "Rotation angle: " << rotationangle/rad <<"\n"
216 G4cout << "New spin : " << newSpin < << 163 // << "New spin : " << newSpin <<"\n"
217 G4cout << "Checked norms : " << normspin < << 164 // << "Checked norms : " << normspin <<" " << normnewspin <<" \n"
218 } << 165 // << G4endl;
>> 166
219 #endif 167 #endif
220 168
221 return newSpin; 169 return newSpin;
222 170
223 } <<
224 <<
225 void G4DecayWithSpin::ProcessDescription(std:: <<
226 { <<
227 outFile << GetProcessName() <<
228 << ": Decay of particles considering paren <<
229 << "kinematics of daughters are dertermine <<
230 } 171 }
231 172