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