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