1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // |
---|
27 | // |
---|
28 | |
---|
29 | #include <time.h> |
---|
30 | |
---|
31 | #include "Randomize.hh" |
---|
32 | #include "G4TransportationManager.hh" |
---|
33 | |
---|
34 | #include "G4ExplicitEuler.hh" |
---|
35 | #include "G4ImplicitEuler.hh" |
---|
36 | #include "G4SimpleRunge.hh" |
---|
37 | #include "G4SimpleHeum.hh" |
---|
38 | #include "G4ClassicalRK4.hh" |
---|
39 | #include "G4CashKarpRKF45.hh" |
---|
40 | |
---|
41 | #include "F04GlobalField.hh" |
---|
42 | |
---|
43 | F04GlobalField* F04GlobalField::object = 0; |
---|
44 | |
---|
45 | F04GlobalField::F04GlobalField() : G4ElectroMagneticField(), |
---|
46 | minStep(0.01*mm), deltaChord(3.0*mm), |
---|
47 | deltaOneStep(0.01*mm), deltaIntersection(0.1*mm), |
---|
48 | epsMin(2.5e-7*mm), epsMax(0.05*mm), |
---|
49 | fEquation(0), fFieldManager(0), |
---|
50 | fFieldPropagator(0), fStepper(0), fChordFinder(0) |
---|
51 | //F04GlobalField::F04GlobalField() : G4MagneticField(), |
---|
52 | // minStep(0.01*mm), deltaChord(3.0*mm), |
---|
53 | // deltaOneStep(0.01*mm), deltaIntersection(0.1*mm), |
---|
54 | // epsMin(2.5e-7*mm), epsMax(0.05*mm), |
---|
55 | // fEquation(0), fFieldManager(0), |
---|
56 | // fFieldPropagator(0), fStepper(0), fChordFinder(0) |
---|
57 | { |
---|
58 | fFieldMessenger = new F04FieldMessenger(this); |
---|
59 | |
---|
60 | fields = new FieldList(); |
---|
61 | |
---|
62 | fStepperType = 4 ; // ClassicalRK4 is default stepper |
---|
63 | |
---|
64 | // set object |
---|
65 | |
---|
66 | object = this; |
---|
67 | |
---|
68 | updateField(); |
---|
69 | } |
---|
70 | |
---|
71 | F04GlobalField::~F04GlobalField() |
---|
72 | { |
---|
73 | clear(); |
---|
74 | |
---|
75 | delete fFieldMessenger; |
---|
76 | |
---|
77 | if (fEquation) delete fEquation; |
---|
78 | if (fFieldManager) delete fFieldManager; |
---|
79 | if (fFieldPropagator) delete fFieldPropagator; |
---|
80 | if (fStepper) delete fStepper; |
---|
81 | if (fChordFinder) delete fChordFinder; |
---|
82 | } |
---|
83 | |
---|
84 | void F04GlobalField::updateField() |
---|
85 | { |
---|
86 | first = true; |
---|
87 | |
---|
88 | nfp = 0; |
---|
89 | fp = 0; |
---|
90 | |
---|
91 | clear(); |
---|
92 | |
---|
93 | // Construct equ. of motion of particles through B fields |
---|
94 | // fEquation = new G4Mag_EqRhs(this); |
---|
95 | // Construct equ. of motion of particles through e.m. fields |
---|
96 | // fEquation = new G4EqMagElectricField(this); |
---|
97 | // Construct equ. of motion of particles including spin through B fields |
---|
98 | // fEquation = new G4Mag_SpinEqRhs(this); |
---|
99 | // Construct equ. of motion of particles including spin through e.m. fields |
---|
100 | fEquation = new G4EqEMFieldWithSpin(this); |
---|
101 | |
---|
102 | // Get transportation, field, and propagator managers |
---|
103 | G4TransportationManager* fTransportManager = |
---|
104 | G4TransportationManager::GetTransportationManager(); |
---|
105 | |
---|
106 | fFieldManager = GetGlobalFieldManager(); |
---|
107 | |
---|
108 | fFieldPropagator = fTransportManager->GetPropagatorInField(); |
---|
109 | |
---|
110 | // Need to SetFieldChangesEnergy to account for a time varying electric |
---|
111 | // field (r.f. fields) |
---|
112 | fFieldManager->SetFieldChangesEnergy(true); |
---|
113 | |
---|
114 | // Set the field |
---|
115 | fFieldManager->SetDetectorField(this); |
---|
116 | |
---|
117 | // Choose a stepper for integration of the equation of motion |
---|
118 | SetStepper(); |
---|
119 | |
---|
120 | // Create a cord finder providing the (global field, min step length, |
---|
121 | // a pointer to the stepper) |
---|
122 | fChordFinder = new G4ChordFinder((G4MagneticField*)this,minStep,fStepper); |
---|
123 | |
---|
124 | // Set accuracy parameters |
---|
125 | fChordFinder->SetDeltaChord( deltaChord ); |
---|
126 | |
---|
127 | fFieldManager->SetAccuraciesWithDeltaOneStep(deltaOneStep); |
---|
128 | |
---|
129 | fFieldManager->SetDeltaIntersection(deltaIntersection); |
---|
130 | |
---|
131 | fFieldPropagator->SetMinimumEpsilonStep(epsMin); |
---|
132 | fFieldPropagator->SetMaximumEpsilonStep(epsMax); |
---|
133 | |
---|
134 | G4cout << "Accuracy Parameters:" << |
---|
135 | " MinStep=" << minStep << |
---|
136 | " DeltaChord=" << deltaChord << |
---|
137 | " DeltaOneStep=" << deltaOneStep << G4endl; |
---|
138 | G4cout << " " << |
---|
139 | " DeltaIntersection=" << deltaIntersection << |
---|
140 | " EpsMin=" << epsMin << |
---|
141 | " EpsMax=" << epsMax << G4endl; |
---|
142 | |
---|
143 | fFieldManager->SetChordFinder(fChordFinder); |
---|
144 | |
---|
145 | } |
---|
146 | |
---|
147 | F04GlobalField* F04GlobalField::getObject() |
---|
148 | { |
---|
149 | if (!object) new F04GlobalField(); |
---|
150 | return object; |
---|
151 | } |
---|
152 | |
---|
153 | void F04GlobalField::SetStepper() |
---|
154 | { |
---|
155 | if(fStepper) delete fStepper; |
---|
156 | |
---|
157 | switch ( fStepperType ) |
---|
158 | { |
---|
159 | case 0: |
---|
160 | // fStepper = new G4ExplicitEuler( fEquation, 8 ); // no spin tracking |
---|
161 | fStepper = new G4ExplicitEuler( fEquation, 12 ); // with spin tracking |
---|
162 | G4cout << "G4ExplicitEuler is called" << G4endl; |
---|
163 | break; |
---|
164 | case 1: |
---|
165 | // fStepper = new G4ImplicitEuler( fEquation, 8 ); // no spin tracking |
---|
166 | fStepper = new G4ImplicitEuler( fEquation, 12 ); // with spin tracking |
---|
167 | G4cout << "G4ImplicitEuler is called" << G4endl; |
---|
168 | break; |
---|
169 | case 2: |
---|
170 | // fStepper = new G4SimpleRunge( fEquation, 8 ); // no spin tracking |
---|
171 | fStepper = new G4SimpleRunge( fEquation, 12 ); // with spin tracking |
---|
172 | G4cout << "G4SimpleRunge is called" << G4endl; |
---|
173 | break; |
---|
174 | case 3: |
---|
175 | // fStepper = new G4SimpleHeum( fEquation, 8 ); // no spin tracking |
---|
176 | fStepper = new G4SimpleHeum( fEquation, 12 ); // with spin tracking |
---|
177 | G4cout << "G4SimpleHeum is called" << G4endl; |
---|
178 | break; |
---|
179 | case 4: |
---|
180 | // fStepper = new G4ClassicalRK4( fEquation, 8 ); // no spin tracking |
---|
181 | fStepper = new G4ClassicalRK4( fEquation, 12 ); // with spin tracking |
---|
182 | G4cout << "G4ClassicalRK4 (default) is called" << G4endl; |
---|
183 | break; |
---|
184 | case 5: |
---|
185 | // fStepper = new G4CashKarpRKF45( fEquation, 8 ); // no spin tracking |
---|
186 | fStepper = new G4CashKarpRKF45( fEquation, 12 ); // with spin tracking |
---|
187 | G4cout << "G4CashKarpRKF45 is called" << G4endl; |
---|
188 | break; |
---|
189 | default: fStepper = 0; |
---|
190 | } |
---|
191 | } |
---|
192 | |
---|
193 | G4FieldManager* F04GlobalField::GetGlobalFieldManager() |
---|
194 | { |
---|
195 | return G4TransportationManager::GetTransportationManager() |
---|
196 | ->GetFieldManager(); |
---|
197 | } |
---|
198 | |
---|
199 | void F04GlobalField::GetFieldValue(const G4double* point, G4double* field) const |
---|
200 | { |
---|
201 | // NOTE: this routine dominates the CPU time for tracking. |
---|
202 | // Using the simple array fp[] instead of fields[] |
---|
203 | // directly sped it up |
---|
204 | |
---|
205 | field[0] = field[1] = field[2] = field[3] = field[4] = field[5] = 0.0; |
---|
206 | |
---|
207 | // protect against Geant4 bug that calls us with point[] NaN. |
---|
208 | if(point[0] != point[0]) return; |
---|
209 | |
---|
210 | // (can't use nfp or fp, as they may change) |
---|
211 | if (first) ((F04GlobalField*)this)->setupArray(); // (cast away const) |
---|
212 | |
---|
213 | for (int i=0; i<nfp; ++i) { |
---|
214 | const F04ElementField* p = fp[i]; |
---|
215 | if (p->isInBoundingBox(point)) { |
---|
216 | p->addFieldValue(point,field); |
---|
217 | } |
---|
218 | } |
---|
219 | |
---|
220 | } |
---|
221 | |
---|
222 | void F04GlobalField::clear() |
---|
223 | { |
---|
224 | if (fields) { |
---|
225 | if (fields->size()>0) { |
---|
226 | FieldList::iterator i; |
---|
227 | for (i=fields->begin(); i!=fields->end(); ++i) delete *i; |
---|
228 | fields->clear(); |
---|
229 | } |
---|
230 | } |
---|
231 | |
---|
232 | if (fp) delete[] fp; |
---|
233 | |
---|
234 | first = true; |
---|
235 | |
---|
236 | nfp = 0; |
---|
237 | fp = NULL; |
---|
238 | } |
---|
239 | |
---|
240 | void F04GlobalField::setupArray() |
---|
241 | { |
---|
242 | first = false; |
---|
243 | nfp = fields->size(); |
---|
244 | fp = new const F04ElementField* [nfp+1]; // add 1 so it's never 0 |
---|
245 | for (int i=0; i<nfp; ++i) fp[i] = (*fields)[i]; |
---|
246 | } |
---|