source: trunk/examples/extended/field/field02/src/F02ElectricFieldSetup.cc@ 1036

Last change on this file since 1036 was 807, checked in by garnier, 17 years ago

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[807]1//
2// ********************************************************************
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4// * *
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24// ********************************************************************
25//
26//
27// $Id: F02ElectricFieldSetup.cc,v 1.2.2.1 2008/05/05 09:23:52 gcosmo Exp $
28// GEANT4 tag $Name: geant4-09-01-patch-02 $
29//
30//
31// User Field class implementation.
32//
33
34#include "F02ElectricFieldSetup.hh"
35#include "F02FieldMessenger.hh"
36
37#include "G4UniformElectricField.hh"
38#include "G4UniformMagField.hh"
39#include "G4MagneticField.hh"
40#include "G4FieldManager.hh"
41#include "G4TransportationManager.hh"
42#include "G4EquationOfMotion.hh"
43#include "G4EqMagElectricField.hh"
44#include "G4Mag_UsualEqRhs.hh"
45#include "G4MagIntegratorStepper.hh"
46#include "G4MagIntegratorDriver.hh"
47#include "G4ChordFinder.hh"
48
49#include "G4ExplicitEuler.hh"
50#include "G4ImplicitEuler.hh"
51#include "G4SimpleRunge.hh"
52#include "G4SimpleHeum.hh"
53#include "G4ClassicalRK4.hh"
54#include "G4HelixExplicitEuler.hh"
55#include "G4HelixImplicitEuler.hh"
56#include "G4HelixSimpleRunge.hh"
57#include "G4CashKarpRKF45.hh"
58#include "G4RKG3_Stepper.hh"
59
60//////////////////////////////////////////////////////////////////////////
61//
62// Constructors:
63
64F02ElectricFieldSetup::F02ElectricFieldSetup()
65 : fChordFinder(0), fStepper(0), fIntgrDriver(0)
66{
67 fEMfield = new G4UniformElectricField(
68 G4ThreeVector(0.0,100000.0*kilovolt/cm,0.0));
69 fFieldMessenger = new F02FieldMessenger(this) ;
70 fEquation = new G4EqMagElectricField(fEMfield);
71 fMinStep = 0.010*mm ; // minimal step of 10 microns
72 fStepperType = 4 ; // ClassicalRK4 -- the default stepper
73
74 fFieldManager = GetGlobalFieldManager();
75 UpdateField();
76
77}
78
79/////////////////////////////////////////////////////////////////////////////////
80
81F02ElectricFieldSetup::F02ElectricFieldSetup(G4ThreeVector pFV)
82 : fChordFinder(0),
83 fStepper(0),
84 fIntgrDriver(0)
85{
86 fEMfield = new G4UniformElectricField(pFV);
87 // GetGlobalFieldManager()->CreateChordFinder(this);
88
89 fFieldMessenger = new F02FieldMessenger(this) ;
90 fEquation = new G4EqMagElectricField(fEMfield);
91 fMinStep = 0.010*mm ; // minimal step of 10 microns
92 fStepperType = 4 ; // ClassicalRK4 -- the default stepper
93
94 fFieldManager = GetGlobalFieldManager();
95 UpdateField();
96}
97
98////////////////////////////////////////////////////////////////////////////////
99
100F02ElectricFieldSetup::~F02ElectricFieldSetup()
101{
102 if(fChordFinder) delete fChordFinder;
103 if(fStepper) delete fStepper;
104 if(fEquation) delete fEquation;
105 if(fEMfield) delete fEMfield;
106}
107
108/////////////////////////////////////////////////////////////////////////////
109//
110// Register this field to 'global' Field Manager and
111// Create Stepper and Chord Finder with predefined type, minstep (resp.)
112//
113
114void F02ElectricFieldSetup::UpdateField()
115{
116 SetStepper();
117
118 G4cout<<"The minimal step is equal to "<<fMinStep/mm<<" mm"<<G4endl ;
119
120 fFieldManager->SetDetectorField(fEMfield );
121
122 if(fChordFinder) delete fChordFinder;
123 // fChordFinder = new G4ChordFinder( fEMfield, fMinStep, fStepper);
124
125 fIntgrDriver = new G4MagInt_Driver(fMinStep,
126 fStepper,
127 fStepper->GetNumberOfVariables() );
128
129 fChordFinder = new G4ChordFinder(fIntgrDriver);
130
131 fFieldManager->SetChordFinder( fChordFinder );
132}
133
134/////////////////////////////////////////////////////////////////////////////
135//
136// Set stepper according to the stepper type
137//
138
139void F02ElectricFieldSetup::SetStepper()
140{
141 G4int nvar = 8;
142
143 if(fStepper) delete fStepper;
144
145 switch ( fStepperType )
146 {
147 case 0:
148 fStepper = new G4ExplicitEuler( fEquation, nvar );
149 G4cout<<"G4ExplicitEuler is calledS"<<G4endl;
150 break;
151 case 1:
152 fStepper = new G4ImplicitEuler( fEquation, nvar );
153 G4cout<<"G4ImplicitEuler is called"<<G4endl;
154 break;
155 case 2:
156 fStepper = new G4SimpleRunge( fEquation, nvar );
157 G4cout<<"G4SimpleRunge is called"<<G4endl;
158 break;
159 case 3:
160 fStepper = new G4SimpleHeum( fEquation, nvar );
161 G4cout<<"G4SimpleHeum is called"<<G4endl;
162 break;
163 case 4:
164 fStepper = new G4ClassicalRK4( fEquation, nvar );
165 G4cout<<"G4ClassicalRK4 (default) is called"<<G4endl;
166 break;
167 case 5:
168 fStepper = new G4CashKarpRKF45( fEquation, nvar );
169 G4cout<<"G4CashKarpRKF45 is called"<<G4endl;
170 break;
171 case 6:
172 fStepper = 0; // new G4RKG3_Stepper( fEquation, nvar );
173 G4cout<<"G4RKG3_Stepper is not currently working for Electric Field"<<G4endl;
174 break;
175 case 7:
176 fStepper = 0; // new G4HelixExplicitEuler( fEquation );
177 G4cout<<"G4HelixExplicitEuler is not valid for Electric Field"<<G4endl;
178 break;
179 case 8:
180 fStepper = 0; // new G4HelixImplicitEuler( fEquation );
181 G4cout<<"G4HelixImplicitEuler is not valid for Electric Field"<<G4endl;
182 break;
183 case 9:
184 fStepper = 0; // new G4HelixSimpleRunge( fEquation );
185 G4cout<<"G4HelixSimpleRunge is not valid for Electric Field"<<G4endl;
186 break;
187 default: fStepper = 0;
188 }
189}
190
191/////////////////////////////////////////////////////////////////////////////
192//
193// Set the value of the Global Field to fieldValue along Z
194//
195
196void F02ElectricFieldSetup::SetFieldValue(G4double fieldValue)
197{
198 G4ThreeVector fieldVector( 0.0, 0.0, fieldValue*volt/mm );
199
200 SetFieldValue( fieldVector );
201}
202
203///////////////////////////////////////////////////////////////////////////////
204//
205// Set the value of the Global Field value to fieldVector
206//
207
208void F02ElectricFieldSetup::SetFieldValue(G4ThreeVector fieldVector)
209{
210 // Find the Field Manager for the global field
211 G4FieldManager* fieldMgr= GetGlobalFieldManager();
212
213 if(fieldVector != G4ThreeVector(0.,0.,0.))
214 {
215 if(fEMfield) delete fEMfield;
216 fEMfield = new G4UniformElectricField(fieldVector);
217
218 fEquation->SetFieldObj(fEMfield); // must now point to the new field
219
220 // UpdateField();
221
222 fieldMgr->SetDetectorField(fEMfield);
223 }
224 else
225 {
226 // If the new field's value is Zero, then it is best to
227 // insure that it is not used for propagation.
228 if(fEMfield) delete fEMfield;
229 fEMfield = 0;
230 fEquation->SetFieldObj(fEMfield); // As a double check ...
231
232 G4MagneticField* fEMfield = 0;
233 fieldMgr->SetDetectorField(fEMfield);
234 }
235}
236
237////////////////////////////////////////////////////////////////////////////////
238//
239// Utility method
240
241G4FieldManager* F02ElectricFieldSetup::GetGlobalFieldManager()
242{
243 return G4TransportationManager::GetTransportationManager()
244 ->GetFieldManager();
245}
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