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25 // 25 //
26 // ------------------------------------------- 26 // ------------------------------------------------------------
27 // GEANT 4 class header file 27 // GEANT 4 class header file
28 // 28 //
29 // History: 29 // History:
30 // 17 August 2004 P. Gumplinger, T. MacP 30 // 17 August 2004 P. Gumplinger, T. MacPhail
31 // 11 April 2008 Kamil Sedlak (PSI), To 31 // 11 April 2008 Kamil Sedlak (PSI), Toni Shiroka (PSI)
32 // ------------------------------------------- 32 // ------------------------------------------------------------
33 // 33 //
34 #include "G4DecayWithSpin.hh" 34 #include "G4DecayWithSpin.hh"
35 35
36 #include "G4Step.hh" 36 #include "G4Step.hh"
37 #include "G4Track.hh" 37 #include "G4Track.hh"
38 #include "G4DecayTable.hh" 38 #include "G4DecayTable.hh"
39 #include "G4MuonDecayChannelWithSpin.hh" 39 #include "G4MuonDecayChannelWithSpin.hh"
40 40
41 #include "G4PhysicalConstants.hh" 41 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh" 42 #include "G4SystemOfUnits.hh"
43 #include "G4Vector3D.hh" 43 #include "G4Vector3D.hh"
44 44
45 #include "G4TransportationManager.hh" 45 #include "G4TransportationManager.hh"
46 #include "G4PropagatorInField.hh" 46 #include "G4PropagatorInField.hh"
47 #include "G4FieldManager.hh" 47 #include "G4FieldManager.hh"
48 #include "G4Field.hh" 48 #include "G4Field.hh"
49 49
50 #include "G4Transform3D.hh" 50 #include "G4Transform3D.hh"
51 51
52 G4DecayWithSpin::G4DecayWithSpin(const G4Strin 52 G4DecayWithSpin::G4DecayWithSpin(const G4String& processName):G4Decay(processName)
53 { 53 {
54 // set Process Sub Type 54 // set Process Sub Type
55 SetProcessSubType(static_cast<int>(DECAY_Wit 55 SetProcessSubType(static_cast<int>(DECAY_WithSpin));
56 56
57 } 57 }
58 58
59 G4DecayWithSpin::~G4DecayWithSpin(){} 59 G4DecayWithSpin::~G4DecayWithSpin(){}
60 60
61 G4VParticleChange* G4DecayWithSpin::PostStepDo 61 G4VParticleChange* G4DecayWithSpin::PostStepDoIt(const G4Track& aTrack, const G4Step& aStep)
62 { 62 {
63 if ( (aTrack.GetTrackStatus() == fStopButAli 63 if ( (aTrack.GetTrackStatus() == fStopButAlive ) ||
64 (aTrack.GetTrackStatus() == fStopAndKil 64 (aTrack.GetTrackStatus() == fStopAndKill ) ){
65 fParticleChangeForDecay.Initialize(aTrack) 65 fParticleChangeForDecay.Initialize(aTrack);
66 return &fParticleChangeForDecay; 66 return &fParticleChangeForDecay;
67 } 67 }
68 68
69 // get particle 69 // get particle
70 const G4DynamicParticle* aParticle = aTrack. 70 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
71 const G4ParticleDefinition* aParticleDef = a 71 const G4ParticleDefinition* aParticleDef = aParticle->GetDefinition();
72 72
73 // get parent_polarization 73 // get parent_polarization
74 G4ThreeVector parent_polarization = aParticl 74 G4ThreeVector parent_polarization = aParticle->GetPolarization();
75 75
76 if(parent_polarization == G4ThreeVector(0,0, << 76 if(parent_polarization == G4ThreeVector(0,0,0))
>> 77 {
77 // Generate random polarization direction 78 // Generate random polarization direction
>> 79
78 G4double cost = 1. - 2.*G4UniformRand(); 80 G4double cost = 1. - 2.*G4UniformRand();
79 G4double sint = std::sqrt((1.-cost)*(1.+co 81 G4double sint = std::sqrt((1.-cost)*(1.+cost));
80 82
81 G4double phi = twopi*G4UniformRand(); 83 G4double phi = twopi*G4UniformRand();
82 G4double sinp = std::sin(phi); 84 G4double sinp = std::sin(phi);
83 G4double cosp = std::cos(phi); 85 G4double cosp = std::cos(phi);
84 86
85 G4double px = sint*cosp; 87 G4double px = sint*cosp;
86 G4double py = sint*sinp; 88 G4double py = sint*sinp;
87 G4double pz = cost; 89 G4double pz = cost;
88 90
89 parent_polarization.setX(px); 91 parent_polarization.setX(px);
90 parent_polarization.setY(py); 92 parent_polarization.setY(py);
91 parent_polarization.setZ(pz); 93 parent_polarization.setZ(pz);
>> 94
92 } 95 }
93 96
94 // decay table 97 // decay table
95 G4DecayTable *decaytable = aParticleDef->Get 98 G4DecayTable *decaytable = aParticleDef->GetDecayTable();
96 if (decaytable != nullptr) { << 99 if (decaytable) {
97 for (G4int ip=0; ip<decaytable->entries(); 100 for (G4int ip=0; ip<decaytable->entries(); ip++){
98 decaytable->GetDecayChannel(ip)->SetPola 101 decaytable->GetDecayChannel(ip)->SetPolarization(parent_polarization);
99 } 102 }
100 } << 103 }
101 104
102 G4ParticleChangeForDecay* pParticleChangeFor 105 G4ParticleChangeForDecay* pParticleChangeForDecay;
103 pParticleChangeForDecay = (G4ParticleChangeF 106 pParticleChangeForDecay = (G4ParticleChangeForDecay*)G4Decay::DecayIt(aTrack,aStep);
>> 107
104 pParticleChangeForDecay->ProposePolarization 108 pParticleChangeForDecay->ProposePolarization(parent_polarization);
105 109
>> 110 //G4cout << parent_polarization.x() << ", "
>> 111 // << parent_polarization.y() << ", "
>> 112 // << parent_polarization.z() << G4endl;
>> 113
106 return pParticleChangeForDecay; 114 return pParticleChangeForDecay;
107 } 115 }
108 116
109 G4VParticleChange* G4DecayWithSpin::AtRestDoIt 117 G4VParticleChange* G4DecayWithSpin::AtRestDoIt(const G4Track& aTrack, const G4Step& aStep)
110 { 118 {
111 119
112 // get particle 120 // get particle
113 const G4DynamicParticle* aParticle = aTrack. 121 const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
114 const G4ParticleDefinition* aParticleDef = a 122 const G4ParticleDefinition* aParticleDef = aParticle->GetDefinition();
115 123
116 // get parent_polarization 124 // get parent_polarization
117 G4ThreeVector parent_polarization = aParticl 125 G4ThreeVector parent_polarization = aParticle->GetPolarization();
118 126
119 if(parent_polarization == G4ThreeVector(0,0, << 127 if(parent_polarization == G4ThreeVector(0,0,0))
>> 128 {
120 // Generate random polarization direction 129 // Generate random polarization direction
>> 130
121 G4double cost = 1. - 2.*G4UniformRand(); 131 G4double cost = 1. - 2.*G4UniformRand();
122 G4double sint = std::sqrt((1.-cost)*(1.+co 132 G4double sint = std::sqrt((1.-cost)*(1.+cost));
123 133
124 G4double phi = twopi*G4UniformRand(); 134 G4double phi = twopi*G4UniformRand();
125 G4double sinp = std::sin(phi); 135 G4double sinp = std::sin(phi);
126 G4double cosp = std::cos(phi); 136 G4double cosp = std::cos(phi);
127 137
128 G4double px = sint*cosp; 138 G4double px = sint*cosp;
129 G4double py = sint*sinp; 139 G4double py = sint*sinp;
130 G4double pz = cost; 140 G4double pz = cost;
131 141
132 parent_polarization.setX(px); 142 parent_polarization.setX(px);
133 parent_polarization.setY(py); 143 parent_polarization.setY(py);
134 parent_polarization.setZ(pz); 144 parent_polarization.setZ(pz);
135 145
136 }else{ 146 }else{
137 147
138 G4FieldManager* fieldMgr = aStep.GetTrack( 148 G4FieldManager* fieldMgr = aStep.GetTrack()->GetVolume()->
139 GetLogica 149 GetLogicalVolume()->GetFieldManager();
140 if (fieldMgr == nullptr) { << 150
>> 151 if (!fieldMgr) {
141 G4TransportationManager *transportMgr = 152 G4TransportationManager *transportMgr =
142 G4TransportationManag 153 G4TransportationManager::GetTransportationManager();
143 G4PropagatorInField* fFieldPropagator = 154 G4PropagatorInField* fFieldPropagator =
144 transp 155 transportMgr->GetPropagatorInField();
145 if (fFieldPropagator) fieldMgr = 156 if (fFieldPropagator) fieldMgr =
146 fFieldPropag 157 fFieldPropagator->GetCurrentFieldManager();
147 } 158 }
148 159
149 const G4Field* field = nullptr; << 160 const G4Field* field = NULL;
150 if (fieldMgr != nullptr) field = fieldMgr- << 161 if(fieldMgr)field = fieldMgr->GetDetectorField();
>> 162
>> 163 if (field) {
151 164
152 if ( field != nullptr ) { <<
153 G4double point[4]; 165 G4double point[4];
154 point[0] = (aStep.GetPostStepPoint()->G 166 point[0] = (aStep.GetPostStepPoint()->GetPosition())[0];
155 point[1] = (aStep.GetPostStepPoint()->G 167 point[1] = (aStep.GetPostStepPoint()->GetPosition())[1];
156 point[2] = (aStep.GetPostStepPoint()->G 168 point[2] = (aStep.GetPostStepPoint()->GetPosition())[2];
157 point[3] = aTrack.GetGlobalTime(); 169 point[3] = aTrack.GetGlobalTime();
158 170
159 G4double fieldValue[6] ={ 0., 0., 0., 0 << 171 G4double fieldValue[6];
160 field -> GetFieldValue(point,fieldValue 172 field -> GetFieldValue(point,fieldValue);
>> 173
161 G4ThreeVector B(fieldValue[0],fieldValu 174 G4ThreeVector B(fieldValue[0],fieldValue[1],fieldValue[2]);
162 175
163 // Call the spin precession only for no 176 // Call the spin precession only for non-zero mag. field
164 if (B.mag2() > 0.) parent_polarization 177 if (B.mag2() > 0.) parent_polarization =
165 Spin_Precessi 178 Spin_Precession(aStep,B,fRemainderLifeTime);
166 179
167 } 180 }
168 } 181 }
169 182
170 // decay table 183 // decay table
171 G4DecayTable *decaytable = aParticleDef->Get 184 G4DecayTable *decaytable = aParticleDef->GetDecayTable();
172 if ( decaytable != nullptr) { << 185 if (decaytable) {
173 for (G4int ip=0; ip<decaytable->entries(); 186 for (G4int ip=0; ip<decaytable->entries(); ip++){
174 decaytable->GetDecayChannel(ip)->SetPola 187 decaytable->GetDecayChannel(ip)->SetPolarization(parent_polarization);
175 } 188 }
176 } 189 }
177 190
178 G4ParticleChangeForDecay* pParticleChangeFor 191 G4ParticleChangeForDecay* pParticleChangeForDecay;
179 pParticleChangeForDecay = (G4ParticleChangeF 192 pParticleChangeForDecay = (G4ParticleChangeForDecay*)G4Decay::DecayIt(aTrack,aStep);
>> 193
180 pParticleChangeForDecay->ProposePolarization 194 pParticleChangeForDecay->ProposePolarization(parent_polarization);
181 195
182 return pParticleChangeForDecay; 196 return pParticleChangeForDecay;
183 197
184 } 198 }
185 199
186 G4ThreeVector G4DecayWithSpin::Spin_Precession 200 G4ThreeVector G4DecayWithSpin::Spin_Precession( const G4Step& aStep,
187 G4Thre 201 G4ThreeVector B, G4double deltatime )
188 { 202 {
189 G4double Bnorm = std::sqrt(sqr(B[0]) + sqr( 203 G4double Bnorm = std::sqrt(sqr(B[0]) + sqr(B[1]) +sqr(B[2]) );
190 204
191 G4double q = aStep.GetTrack()->GetDefinition 205 G4double q = aStep.GetTrack()->GetDefinition()->GetPDGCharge();
192 G4double a = 1.165922e-3; 206 G4double a = 1.165922e-3;
193 G4double s_omega = 8.5062e+7*rad/(s*kilogaus 207 G4double s_omega = 8.5062e+7*rad/(s*kilogauss);
194 208
195 G4double omega = -(q*s_omega)*(1.+a) * Bnorm 209 G4double omega = -(q*s_omega)*(1.+a) * Bnorm;
196 210
197 G4double rotationangle = deltatime * omega; 211 G4double rotationangle = deltatime * omega;
198 212
199 G4Transform3D SpinRotation = G4Rotate3D(rota 213 G4Transform3D SpinRotation = G4Rotate3D(rotationangle,B.unit());
200 214
201 G4Vector3D Spin = aStep.GetTrack() -> GetPol 215 G4Vector3D Spin = aStep.GetTrack() -> GetPolarization();
202 216
203 G4Vector3D newSpin = SpinRotation * Spin; 217 G4Vector3D newSpin = SpinRotation * Spin;
204 218
205 #ifdef G4VERBOSE 219 #ifdef G4VERBOSE
206 if (GetVerboseLevel()>2) { 220 if (GetVerboseLevel()>2) {
207 G4double normspin = std::sqrt(Spin*Spin); 221 G4double normspin = std::sqrt(Spin*Spin);
208 G4double normnewspin = std::sqrt(newSpin*n 222 G4double normnewspin = std::sqrt(newSpin*newSpin);
209 //G4double cosalpha = Spin*newSpin/normspi 223 //G4double cosalpha = Spin*newSpin/normspin/normnewspin;
210 //G4double alpha = std::acos(cosalpha); 224 //G4double alpha = std::acos(cosalpha);
211 225
212 G4cout << "AT REST::: PARAMETERS " << G4en 226 G4cout << "AT REST::: PARAMETERS " << G4endl;
213 G4cout << "Initial spin : " << Spin << G 227 G4cout << "Initial spin : " << Spin << G4endl;
214 G4cout << "Delta time : " << deltatime 228 G4cout << "Delta time : " << deltatime << G4endl;
215 G4cout << "Rotation angle: " << rotationan 229 G4cout << "Rotation angle: " << rotationangle/rad << G4endl;
216 G4cout << "New spin : " << newSpin < 230 G4cout << "New spin : " << newSpin << G4endl;
217 G4cout << "Checked norms : " << normspin < 231 G4cout << "Checked norms : " << normspin <<" " << normnewspin << G4endl;
218 } 232 }
219 #endif 233 #endif
220 234
221 return newSpin; 235 return newSpin;
222 236
223 } <<
224 <<
225 void G4DecayWithSpin::ProcessDescription(std:: <<
226 { <<
227 outFile << GetProcessName() <<
228 << ": Decay of particles considering paren <<
229 << "kinematics of daughters are dertermine <<
230 } 237 }
231 238