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25 //
26 /// \file exoticphysics/monopole/src/G4MonopoleFieldSetup.cc
27 /// \brief Implementation of the G4MonopoleFieldSetup class
28 //
29 //
30 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
31 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
32 //
33 //
34 // G4MonopoleFieldSetup is responsible for setting up a magnetic field
35 // and the ability to use it with two different equation of motions,
36 // one for monopoles and another for the rest of the particles.
37 //
38 //
39
40 // =======================================================================
41 // Created: 13 May 2010, B. Bozsogi
42 // =======================================================================
43
44 #include "G4MonopoleFieldSetup.hh"
45
46 #include "G4ChordFinder.hh"
47 #include "G4FieldManager.hh"
48 #include "G4MagIntegratorStepper.hh"
49 #include "G4Mag_UsualEqRhs.hh"
50 #include "G4MagneticField.hh"
51 #include "G4MonopoleEquation.hh"
52 #include "G4MonopoleFieldMessenger.hh"
53 #include "G4TransportationManager.hh"
54 #include "G4UniformMagField.hh"
55
56 // #include "G4ExplicitEuler.hh"
57 // #include "G4ImplicitEuler.hh"
58 // #include "G4SimpleRunge.hh"
59 // #include "G4SimpleHeum.hh"
60 #include "G4ClassicalRK4.hh"
61 // #include "G4HelixExplicitEuler.hh"
62 // #include "G4HelixImplicitEuler.hh"
63 // #include "G4HelixSimpleRunge.hh"
64 // #include "G4CashKarpRKF45.hh"
65 // #include "G4RKG3_Stepper.hh"
66
67 #include "G4SystemOfUnits.hh"
68
69 // G4MonopoleFieldSetup* G4MonopoleFieldSetup::fMonopoleFieldSetup=0;
70
71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
72
73 G4MonopoleFieldSetup::G4MonopoleFieldSetup()
74 : fFieldManager(0),
75 fChordFinder(0),
76 fUsualChordFinder(0),
77 fMonopoleChordFinder(0),
78 fEquation(0),
79 fMonopoleEquation(0),
80 fMagneticField(0),
81 fStepper(0),
82 fMonopoleStepper(0),
83 fMinStep(0.0),
84 fZmagFieldValue(0.2 * tesla),
85 fMonopoleFieldMessenger(0)
86 {
87 fMonopoleFieldMessenger = new G4MonopoleFieldMessenger(this);
88 fFieldManager = GetGlobalFieldManager();
89 }
90
91 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
92
93 // G4MonopoleFieldSetup* G4MonopoleFieldSetup::GetMonopoleFieldSetup()
94 // {
95 // if (0 == fMonopoleFieldSetup)
96 // {
97 // static G4ThreadLocal G4MonopoleFieldSetup theInstance;
98 // fMonopoleFieldSetup = &theInstance;
99 // }
100
101 // return fMonopoleFieldSetup;
102 // }
103
104 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
105
106 G4MonopoleFieldSetup::~G4MonopoleFieldSetup()
107 {
108 delete fMonopoleFieldMessenger;
109 if (fMagneticField) delete fMagneticField;
110 // if(fChordFinder) delete fChordFinder;
111 if (fUsualChordFinder) delete fUsualChordFinder;
112 if (fMonopoleChordFinder) delete fMonopoleChordFinder;
113 if (fStepper) delete fStepper;
114 if (fMonopoleStepper) delete fMonopoleStepper;
115 }
116
117 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
118
119 void G4MonopoleFieldSetup::SetZMagFieldValue(G4double val)
120 {
121 // set new magnetic field value and rebuild the field
122 fZmagFieldValue = val;
123
124 ConstructMagField();
125 }
126
127 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
128
129 void G4MonopoleFieldSetup::ConstructMagField()
130 {
131 // apply a global uniform magnetic field along Z axis
132 if (fMagneticField) {
133 delete fMagneticField;
134 } // delete the existing magn field
135
136 if (fZmagFieldValue != 0.) // create a new one if non nul
137 {
138 // G4cout << "Go to create new field ..." << G4endl;
139 fMagneticField = new G4UniformMagField(G4ThreeVector(0., 0., fZmagFieldValue));
140 InitialiseAll();
141 }
142 else {
143 // G4cout << "Set field = 0 ..." << G4endl;
144 fMagneticField = 0;
145 }
146
147 fFieldManager->SetDetectorField(fMagneticField);
148 }
149
150 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
151
152 void G4MonopoleFieldSetup::InitialiseAll()
153 {
154 fEquation = new G4Mag_UsualEqRhs(fMagneticField);
155 fMonopoleEquation = new G4MonopoleEquation(fMagneticField);
156
157 fMinStep = 0.01 * mm; // minimal step of 1 mm is default
158
159 fMonopoleStepper = new G4ClassicalRK4(fMonopoleEquation, 8);
160 fStepper = new G4ClassicalRK4(fEquation);
161
162 fUsualChordFinder = new G4ChordFinder(fMagneticField, fMinStep, fStepper);
163 fMonopoleChordFinder = new G4ChordFinder(fMagneticField, fMinStep, fMonopoleStepper);
164
165 SetStepperAndChordFinder(0);
166 }
167
168 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
169
170 void G4MonopoleFieldSetup::SetStepperAndChordFinder(G4int val)
171 {
172 if (fMagneticField) {
173 fFieldManager->SetDetectorField(fMagneticField);
174 // if(fChordFinder) delete fChordFinder;
175
176 switch (val) {
177 // case 0:
178 // fChordFinder = new G4ChordFinder( fMagneticField, fMinStep, fStepper);
179 // break;
180 // case 1:
181 // fChordFinder = new G4ChordFinder( fMagneticField, fMinStep,
182 // fMonopoleStepper);
183 // break;
184 case 0:
185 fChordFinder = fUsualChordFinder;
186 break;
187 case 1:
188 fChordFinder = fMonopoleChordFinder;
189 break;
190 }
191
192 fFieldManager->SetChordFinder(fChordFinder);
193 }
194 }
195
196 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
197
198 G4FieldManager* G4MonopoleFieldSetup::GetGlobalFieldManager()
199 {
200 return G4TransportationManager::GetTransportationManager()->GetFieldManager();
201 }
202
203 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
204