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25 // 25 //
26 // Class G4PropagatorInField <<
27 // 26 //
28 // class description: << 27 // $Id: G4PropagatorInField.hh,v 1.13 2007/06/08 09:49:34 gcosmo Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01 $
>> 29 //
>> 30 // class G4PropagatorInField
>> 31 //
>> 32 // Class description:
29 // 33 //
30 // This class performs the navigation/propagat 34 // This class performs the navigation/propagation of a particle/track
31 // in a magnetic field. The field is in genera 35 // in a magnetic field. The field is in general non-uniform.
32 // For the calculation of the path, it relies 36 // For the calculation of the path, it relies on the class G4ChordFinder.
33 << 37 //
>> 38 // Key Method:
>> 39 // ComputeStep(..)
34 // History: 40 // History:
35 // ------- 41 // -------
36 // 25.10.96 John Apostolakis, design and impl 42 // 25.10.96 John Apostolakis, design and implementation
37 // 25.03.97 John Apostolakis, adaptation for 43 // 25.03.97 John Apostolakis, adaptation for G4Transportation and cleanup
38 // 8.11.02 John Apostolakis, changes to enab 44 // 8.11.02 John Apostolakis, changes to enable use of safety in intersecting
39 // ------------------------------------------- 45 // ---------------------------------------------------------------------------
>> 46
40 #ifndef G4PropagatorInField_hh 47 #ifndef G4PropagatorInField_hh
41 #define G4PropagatorInField_hh 1 48 #define G4PropagatorInField_hh 1
42 49
43 #include "G4Types.hh" 50 #include "G4Types.hh"
44 51
45 #include <vector> 52 #include <vector>
46 53
47 #include "G4FieldTrack.hh" 54 #include "G4FieldTrack.hh"
48 #include "G4FieldManager.hh" 55 #include "G4FieldManager.hh"
49 #include "G4VIntersectionLocator.hh" <<
50 <<
51 class G4ChordFinder; 56 class G4ChordFinder;
52 57
53 class G4Navigator; 58 class G4Navigator;
54 class G4VPhysicalVolume; 59 class G4VPhysicalVolume;
55 class G4VCurvedTrajectoryFilter; 60 class G4VCurvedTrajectoryFilter;
56 61
57 class G4PropagatorInField 62 class G4PropagatorInField
58 { 63 {
59 64
60 public: // with description 65 public: // with description
61 66
62 G4PropagatorInField( G4Navigator* theNaviga << 67 G4PropagatorInField( G4Navigator *theNavigator,
63 G4FieldManager* detect << 68 G4FieldManager *detectorFieldMgr );
64 G4VIntersectionLocator <<
65 ~G4PropagatorInField(); 69 ~G4PropagatorInField();
66 70
67 G4double ComputeStep( G4FieldTrack& pFieldT << 71 G4double ComputeStep( G4FieldTrack &pFieldTrack,
68 G4double pCurrentProp << 72 G4double pCurrentProposedStepLength,
69 G4double& pNewSafety, << 73 G4double &pNewSafety,
70 G4VPhysicalVolume* pP << 74 G4VPhysicalVolume *pPhysVol=0 );
71 G4bool canRelaxDeltaC <<
72 // Compute the next geometric Step 75 // Compute the next geometric Step
73 76
74 inline G4ThreeVector EndPosition() const; << 77 inline G4ThreeVector EndPosition() const;
75 inline G4ThreeVector EndMomentumDir() const << 78 inline G4ThreeVector EndMomentumDir() const;
76 inline G4bool IsParticleLooping() co << 79 inline G4bool IsParticleLooping() const;
77 // Return the state after the Step 80 // Return the state after the Step
78 81
79 inline G4double GetEpsilonStep() const; << 82 inline G4double GetEpsilonStep() const;
80 // Relative accuracy for current Step (Ca 83 // Relative accuracy for current Step (Calc.)
81 inline void SetEpsilonStep(G4double new << 84 inline void SetEpsilonStep(G4double newEps);
82 // The ratio DeltaOneStep()/h_current_ste 85 // The ratio DeltaOneStep()/h_current_step
83 86
84 G4FieldManager* FindAndSetFieldManager(G4VP << 87 inline void SetChargeMomentumMass( G4double charge, // in e+ units
>> 88 G4double momentum, // in Geant4 units
>> 89 G4double pMass );
>> 90 // Inform this and all associated classes of q, p, m
>> 91
>> 92 G4FieldManager* FindAndSetFieldManager(G4VPhysicalVolume* pCurrentPhysVol);
85 // Set (and return) the correct field man 93 // Set (and return) the correct field manager (global or local),
86 // if it exists. << 94 // if it exists.
87 // Should be called before ComputeStep is 95 // Should be called before ComputeStep is called;
88 // Currently, ComputeStep will call it, i << 96 // - currently, ComputeStep will call it, if it has not been called.
89 97
90 inline G4ChordFinder* GetChordFinder(); 98 inline G4ChordFinder* GetChordFinder();
91 99
92 G4int SetVerboseLevel( G4int verbose << 100 G4int SetVerboseLevel( G4int verbose );
93 inline G4int GetVerboseLevel() const; << 101 inline G4int GetVerboseLevel() const;
94 inline G4int Verbose() const; << 102 inline G4int Verbose() const;
95 inline void CheckMode(G4bool mode); << 103
96 << 104 inline G4int GetMaxLoopCount() const;
97 inline void SetVerboseTrace( G4bool enabl << 105 inline void SetMaxLoopCount( G4int new_max );
98 inline G4bool GetVerboseTrace(); << 106 // A maximum for the number of steps that a (looping) particle can take.
99 // Tracing key parts of Compute Step << 107
100 << 108 void printStatus( const G4FieldTrack& startFT,
101 inline G4int GetMaxLoopCount() const; << 109 const G4FieldTrack& currentFT,
102 inline void SetMaxLoopCount( G4int new_max << 110 G4double requestStep,
103 // A maximum for the number of substeps t << 111 G4double safety,
104 // Above this number it is signaled as << 112 G4int step,
105 << 113 G4VPhysicalVolume* startVolume);
106 void printStatus( const G4FieldTrack& <<
107 const G4FieldTrack& <<
108 G4double <<
109 G4double <<
110 G4int <<
111 G4VPhysicalVolume* <<
112 // Print Method - useful mostly for debug 114 // Print Method - useful mostly for debugging.
113 115
114 inline G4FieldTrack GetEndState() const; 116 inline G4FieldTrack GetEndState() const;
115 117
116 inline G4double GetMinimumEpsilonStep() con << 118 // The following methods are now obsolescent but *for now* will work
117 inline void SetMinimumEpsilonStep( G4do << 119 // They are being replaced by same-name methods in G4FieldManager,
118 inline G4double GetMaximumEpsilonStep() con << 120 // allowing the specialisation in different volumes.
119 inline void SetMaximumEpsilonStep( G4do << 121 // Their new behaviour is to change the values for the global field manager.
120 // The 4 above methods are now obsolescen << 122 inline G4double GetMinimumEpsilonStep() const;
121 // They are being replaced by same-name m << 123 inline void SetMinimumEpsilonStep( G4double newEpsMin );
122 // allowing the specialisation in differe << 124 // Minimum for Relative accuracy of any Step
123 // Their new behaviour is to change the v <<
124 // manager <<
125 <<
126 void SetLargestAcceptableStep( G4double <<
127 G4double GetLargestAcceptableStep(); <<
128 void ResetLargestAcceptableStep(); <<
129 // Obtain / change the size of the larges <<
130 // Reset method uses the world volume's <<
131 <<
132 G4double GetMaxStepSizeMultiplier(); <<
133 void SetMaxStepSizeMultiplier(G4double <<
134 // Control extra Multiplier parameter for <<
135 G4double GetMinBigDistance(); <<
136 void SetMinBigDistance(G4double val); <<
137 // Control minimum 'directional' distance <<
138 <<
139 void SetTrajectoryFilter(G4VCurvedTrajector <<
140 // Set the filter that examines & stores <<
141 // curved trajectory points. Currently o <<
142 <<
143 std::vector<G4ThreeVector>* GimmeTrajectory <<
144 // Access the points which have passed by <<
145 // Responsibility for deleting the points <<
146 // This method MUST BE called exactly ONC <<
147 <<
148 void ClearPropagatorState(); <<
149 // Clear all the State of this class and <<
150 // --> the current field manager & chord <<
151 125
152 inline void SetDetectorFieldManager( G4Fiel << 126 inline G4double GetMaximumEpsilonStep() const;
153 // Update this (dangerous) state -- for t << 127 inline void SetMaximumEpsilonStep( G4double newEpsMax );
154 <<
155 inline void SetUseSafetyForOptimization( <<
156 inline G4bool GetUseSafetyForOptimization() <<
157 // Toggle & view parameter for using safe <<
158 // unneccesary calls to navigator (thus ' <<
159 inline G4bool IntersectChord( const G4Three <<
160 const G4Three <<
161 G4doubl <<
162 G4doubl <<
163 G4Three <<
164 // Intersect the chord from StartPointA t <<
165 // and return whether an intersection occ <<
166 // NOTE: Safety is changed! <<
167 128
168 inline G4bool IsFirstStepInVolume(); << 129 inline void SetLargestAcceptableStep( G4double newBigDist );
169 inline G4bool IsLastStepInVolume(); << 130 inline G4double GetLargestAcceptableStep();
170 inline void PrepareNewTrack(); <<
171 <<
172 inline G4VIntersectionLocator* GetIntersect <<
173 inline void SetIntersectionLocator(G4VInter <<
174 // Change or get the object which calcula <<
175 // intersection point with the next bound <<
176 <<
177 inline G4int GetIterationsToIncreaseChordDi <<
178 inline void SetIterationsToIncreaseChordDi <<
179 // Control the parameter which enables th <<
180 // which ensures that chord segments ar <<
181 // their sagitta is small than delta-ch <<
182 // The Set method increases the value of <<
183 // doubling it once the number of itera <<
184 // value of 'IncreaseChordDistanceThres <<
185 // again every time the iteration count <<
186 // value. <<
187 // Note: delta-chord is reset to its orig <<
188 // each call to ComputeStep. <<
189 131
190 public: // without description << 132 public: // with description
191 133
192 inline G4double GetDeltaIntersection() cons << 134 // The following methods are obsolete and will not work --
193 inline G4double GetDeltaOneStep() const; << 135 // as they have been replaced by the same methods in G4FieldManager
>> 136 // since Geant4 4.0
>> 137 inline G4double GetDeltaIntersection() const;
>> 138 inline G4double GetDeltaOneStep() const;
>> 139 inline void SetAccuraciesWithDeltaOneStep( G4double deltaOneStep );
>> 140 inline void SetDeltaIntersection( G4double deltaIntersection );
>> 141 inline void SetDeltaOneStep( G4double deltaOneStep );
>> 142
>> 143 public: // without description
194 144
195 inline G4FieldManager* GetCurrentFieldManag << 145 inline G4FieldManager* GetCurrentFieldManager();
196 inline G4EquationOfMotion* GetCurrentEquati << 146 inline void SetNavigatorForPropagating( G4Navigator *SimpleOrMultiNavigator );
197 // Auxiliary methods - their results can << 147 inline G4Navigator* GetNavigatorForPropagating();
198 148
199 inline void SetNavigatorForPropagating(G4Na << 149 public: // no description
200 inline G4Navigator* GetNavigatorForPropagat <<
201 150
202 inline void SetThresholdNoZeroStep( G4int n 151 inline void SetThresholdNoZeroStep( G4int noAct,
203 G4int n 152 G4int noHarsh,
204 G4int n 153 G4int noAbandon );
205 inline G4int GetThresholdNoZeroSteps( G4int 154 inline G4int GetThresholdNoZeroSteps( G4int i );
206 155
207 inline G4double GetZeroStepThreshold(); << 156 public: // with description
208 inline void SetZeroStepThreshold( G4dou << 157 //
209 << 158 void SetTrajectoryFilter(G4VCurvedTrajectoryFilter* filter);
210 void RefreshIntersectionLocator(); << 159 // Set the filter that examines & stores 'intermediate'
211 // Update the Locator with parameters fro << 160 // curved trajectory points. Currently only position is stored.
212 // and from current field manager << 161
>> 162 std::vector<G4ThreeVector>* GimmeTrajectoryVectorAndForgetIt() const;
>> 163 // Access the points which have passed by the filter.
>> 164 // Responsibility for deleting the points lies with the client.
>> 165 // This method MUST BE called exactly ONCE per step.
>> 166
>> 167 void ClearPropagatorState();
>> 168 // Clear all the State of this class and its current associates
>> 169 // --> the current field manager & chord finder will also be called
>> 170
>> 171 inline void SetDetectorFieldManager( G4FieldManager* newGlobalFieldManager );
>> 172 // Update this (dangerous) state -- for the time being
>> 173
>> 174 inline void SetUseSafetyForOptimization( G4bool );
>> 175 inline G4bool GetUseSafetyForOptimization();
>> 176 // Toggle & view parameter for using safety to discard
>> 177 // unneccesary calls to navigator (thus 'optimising' performance)
>> 178
>> 179 protected: // with description
>> 180
>> 181 G4bool LocateIntersectionPoint(
>> 182 const G4FieldTrack& curveStartPointTangent, // A
>> 183 const G4FieldTrack& curveEndPointTangent, // B
>> 184 const G4ThreeVector& trialPoint, // E
>> 185 G4FieldTrack& intersectPointTangent, // Output
>> 186 G4bool& recalculatedEndPoint); // Out:
>> 187
>> 188 // If such an intersection exists, this function
>> 189 // calculate the intersection point of the true path of the particle
>> 190 // with the surface of the current volume (or of one of its daughters).
>> 191 // (Should use lateral displacement as measure of convergence).
>> 192
>> 193 G4bool IntersectChord( G4ThreeVector StartPointA,
>> 194 G4ThreeVector EndPointB,
>> 195 G4double &NewSafety,
>> 196 G4double &LinearStepLength,
>> 197 G4ThreeVector &IntersectionPoint);
>> 198 // Intersect the chord from StartPointA to EndPointB
>> 199 // and return whether an intersection occurred
213 200
214 protected: // without description << 201 G4FieldTrack ReEstimateEndpoint( const G4FieldTrack &CurrentStateA,
>> 202 const G4FieldTrack &EstimtdEndStateB,
>> 203 G4double linearDistSq,
>> 204 G4double curveDist);
>> 205 // Return new estimate for state after curveDist
>> 206 // starting from CurrentStateA, to replace EstimtdEndStateB,
>> 207 // (and report displacement -- if field is compiled verbose.)
215 208
216 void PrintStepLengthDiagnostic( G4double 209 void PrintStepLengthDiagnostic( G4double currentProposedStepLength,
217 G4double 210 G4double decreaseFactor,
218 G4double 211 G4double stepTrial,
219 const G4FieldTrac 212 const G4FieldTrack& aFieldTrack);
>> 213 private:
220 214
221 void ReportLoopingParticle( G4int count, G << 215 // ----------------------------------------------------------------------
222 G4double stepRe << 216 // DATA Members
223 const G4ThreeVe << 217 // ----------------------------------------------------------------------
224 G4VPhysicalVolu <<
225 void ReportStuckParticle(G4int noZeroSteps, <<
226 G4double lastTried <<
227 218
228 private: << 219 G4FieldManager *fDetectorFieldMgr;
>> 220 // The Field Manager of the whole Detector. (default)
>> 221
>> 222 G4FieldManager *fCurrentFieldMgr;
>> 223 // The Field Manager of the current volume (may be the one above.)
>> 224
>> 225 G4Navigator *fNavigator;
>> 226
>> 227 // STATE information
>> 228 // -----------------
>> 229
>> 230 G4double fEpsilonStep;
>> 231 // Relative accuracy for current Step (Calc.)
>> 232
>> 233 G4FieldTrack End_PointAndTangent;
>> 234 // End point storage
229 235
230 // ---------------------------------------- << 236 G4bool fParticleIsLooping;
231 // DATA Members <<
232 // ---------------------------------------- <<
233 237
234 // ======================================= << 238 G4int fVerboseLevel;
235 // INVARIANTS - Must not change during tra << 239 // For debuging purposes
236 240
237 // ** PARAMETERS ----------- << 241 G4int fMax_loop_count;
238 G4int fMax_loop_count = 1000; <<
239 // Limit for the number of sub-steps take 242 // Limit for the number of sub-steps taken in one call to ComputeStep
240 G4int fIncreaseChordDistanceThreshold = 100 <<
241 G4bool fUseSafetyForOptimisation = true; <<
242 // (false) is less sensitive to incorrect <<
243 243
244 // Thresholds for identifying "abnormal" c << 244 // Variables to keep track of "abnormal" case - which causes loop
245 // 245 //
246 G4int fActionThreshold_NoZeroSteps = 2; << 246 G4int fNoZeroStep; // Counter of zeroStep
247 G4int fSevereActionThreshold_NoZeroSteps = << 247 G4int fActionThreshold_NoZeroSteps; // Threshold: above this - act
248 G4int fAbandonThreshold_NoZeroSteps = 50; << 248 G4int fSevereActionThreshold_NoZeroSteps; // Threshold to act harshly
249 G4double fZeroStepThreshold = 0.0; << 249 G4int fAbandonThreshold_NoZeroSteps; // Threshold to abandon
250 // Threshold *length* for counting of tin << 250
251 << 251 G4double fFull_CurveLen_of_LastAttempt;
252 // Parameters related to handling of very l << 252 G4double fLast_ProposedStepLength;
253 // occur typically in large volumes with << 253 G4double fLargestAcceptableStep;
254 G4double fLargestAcceptableStep; << 254
255 // Maximum size of a step - for optimizat << 255 G4double fCharge, fInitialMomentumModulus, fMass;
256 G4double fMaxStepSizeMultiplier = 3; << 256
257 // Multiplier for directional exit distan << 257 G4ThreeVector fPreviousSftOrigin;
258 G4double fMinBigDistance= 100. ; // * CLHEP << 258 G4double fPreviousSafety;
259 // Minimum distance added to directional << 259 G4bool fUseSafetyForOptimisation;
260 // ** End of PARAMETERS ----- << 260 // Last safety origin & value: for optimisation
261 <<
262 G4double kCarTolerance; <<
263 // Geometrical tolerance defining surfa <<
264 <<
265 G4bool fAllocatedLocator; <<
266 <<
267 // --------------------------------------- <<
268 // ** Dependent Objects - to which work is <<
269 <<
270 G4FieldManager* fDetectorFieldMgr; <<
271 // The Field Manager of the whole Dete <<
272 <<
273 G4VIntersectionLocator* fIntersectionLocato <<
274 // Refines candidate intersection <<
275 <<
276 G4VCurvedTrajectoryFilter* fpTrajectoryFilt <<
277 // The filter encapsulates the algorithm <<
278 // intermediate points should be stored i <<
279 // When it is NULL, no intermediate point <<
280 // Else PIF::ComputeStep must submit (all <<
281 // points it calculates, to this filter. <<
282 261
283 G4Navigator* fNavigator; << 262 G4bool fSetFieldMgr;
284 // Set externally - only by tracking / ru << 263 // Flag whether field manager has been set for the current step
285 // <<
286 // ** End of Dependent Objects ----------- <<
287 264
288 // End of INVARIANTS << 265 G4double kCarTolerance;
289 // ======================================= << 266 // Geometrical tolerance defining surface thickness
290 267
291 // STATE information << 268 private:
292 // ----------------- <<
293 G4FieldManager* fCurrentFieldMgr; <<
294 // The Field Manager of the current volu <<
295 G4bool fSetFieldMgr = false; // Has it bee <<
296 <<
297 // Parameters of current step <<
298 G4double fEpsilonStep; // Relati <<
299 G4FieldTrack End_PointAndTangent; // End po <<
300 G4bool fParticleIsLooping = false; <<
301 G4int fNoZeroStep = 0; // Count <<
302 <<
303 // State used for Optimisation <<
304 G4double fFull_CurveLen_of_LastAttempt = -1 <<
305 G4double fLast_ProposedStepLength = -1; <<
306 // Previous step information -- for use i <<
307 G4ThreeVector fPreviousSftOrigin; <<
308 G4double fPreviousSafety = 0.0; <<
309 // Last safety origin & value: for optimi <<
310 269
311 G4int fVerboseLevel = 0; << 270 static const G4int max_depth=4;
312 G4bool fVerbTracePiF = false; << 271 G4FieldTrack* ptrInterMedFT[max_depth+1];
313 G4bool fCheck = false; << 272 // Used to store intermediate values of tracks in case of
314 // For debugging purposes << 273 // too slow progress
315 << 274
316 G4bool fFirstStepInVolume = true; << 275 private:
317 G4bool fLastStepInVolume = true; << 276
318 G4bool fNewTrack = true; << 277 G4VCurvedTrajectoryFilter* fpTrajectoryFilter;
>> 278 // The filter encapsulates the algorithm which selects which
>> 279 // intermediate points should be stored in a trajectory.
>> 280 // When it is NULL, no intermediate points will be stored.
>> 281 // Else PIF::ComputeStep must submit (all) intermediate
>> 282 // points it calculates, to this filter. (jacek 04/11/2002)
319 }; 283 };
320 284
321 // Inline methods << 285 // ********************************************************************
322 // << 286 // Inline methods.
>> 287 // ********************************************************************
>> 288
323 #include "G4PropagatorInField.icc" 289 #include "G4PropagatorInField.icc"
324 290
325 #endif 291 #endif
326 292