| Geant4 Cross Reference |
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 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4RKPropagation.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 6 June 2000
37 // -------------------------------------------------------------------
38 #include "G4RKPropagation.hh"
39 #include "G4PhysicalConstants.hh"
40 #include "G4SystemOfUnits.hh"
41 // nuclear fields
42 #include "G4VNuclearField.hh"
43 #include "G4ProtonField.hh"
44 #include "G4NeutronField.hh"
45 #include "G4AntiProtonField.hh"
46 #include "G4KaonPlusField.hh"
47 #include "G4KaonMinusField.hh"
48 #include "G4KaonZeroField.hh"
49 #include "G4PionPlusField.hh"
50 #include "G4PionMinusField.hh"
51 #include "G4PionZeroField.hh"
52 #include "G4SigmaPlusField.hh"
53 #include "G4SigmaMinusField.hh"
54 #include "G4SigmaZeroField.hh"
55 // particles properties
56 #include "G4Proton.hh"
57 #include "G4Neutron.hh"
58 #include "G4AntiProton.hh"
59 #include "G4KaonPlus.hh"
60 #include "G4KaonMinus.hh"
61 #include "G4KaonZero.hh"
62 #include "G4PionPlus.hh"
63 #include "G4PionMinus.hh"
64 #include "G4PionZero.hh"
65 #include "G4SigmaPlus.hh"
66 #include "G4SigmaMinus.hh"
67 #include "G4SigmaZero.hh"
68
69 #include "globals.hh"
70
71 #include "G4KM_OpticalEqRhs.hh"
72 #include "G4KM_NucleonEqRhs.hh"
73 #include "G4ClassicalRK4.hh"
74 #include "G4MagIntegratorDriver.hh"
75
76 #include "G4LorentzRotation.hh"
77
78 // unsigned EncodingHashFun(const G4int& aEncoding);
79
80 G4RKPropagation::G4RKPropagation() :
81 theOuterRadius(0), theNucleus(0),
82 theFieldMap(0), theEquationMap(0),
83 theField(0)
84 { }
85
86
87 G4RKPropagation::~G4RKPropagation()
88 {
89 // free theFieldMap memory
90 if(theFieldMap) delete_FieldsAndMap(theFieldMap);
91
92 // free theEquationMap memory
93 if(theEquationMap) delete_EquationsAndMap(theEquationMap);
94
95 if (theField) delete theField;
96 }
97
98 //----------------------------------------------------------------------------
99 void G4RKPropagation::Init(G4V3DNucleus * nucleus)
100 //----------------------------------------------------------------------------
101 {
102
103 // free theFieldMap memory
104 if(theFieldMap) delete_FieldsAndMap(theFieldMap);
105
106 // free theEquationMap memory
107 if(theEquationMap) delete_EquationsAndMap(theEquationMap);
108
109 if (theField) delete theField;
110
111 // Initialize the nuclear field map.
112 theNucleus = nucleus;
113 theOuterRadius = theNucleus->GetOuterRadius();
114
115 theFieldMap = new std::map <G4int, G4VNuclearField*, std::less<G4int> >;
116
117 (*theFieldMap)[G4Proton::Proton()->GetPDGEncoding()] = new G4ProtonField(theNucleus);
118 (*theFieldMap)[G4Neutron::Neutron()->GetPDGEncoding()] = new G4NeutronField(theNucleus);
119 (*theFieldMap)[G4AntiProton::AntiProton()->GetPDGEncoding()] = new G4AntiProtonField(theNucleus);
120 (*theFieldMap)[G4KaonPlus::KaonPlus()->GetPDGEncoding()] = new G4KaonPlusField(theNucleus);
121 (*theFieldMap)[G4KaonMinus::KaonMinus()->GetPDGEncoding()] = new G4KaonMinusField(theNucleus);
122 (*theFieldMap)[G4KaonZero::KaonZero()->GetPDGEncoding()] = new G4KaonZeroField(theNucleus);
123 (*theFieldMap)[G4PionPlus::PionPlus()->GetPDGEncoding()] = new G4PionPlusField(theNucleus);
124 (*theFieldMap)[G4PionMinus::PionMinus()->GetPDGEncoding()] = new G4PionMinusField(theNucleus);
125 (*theFieldMap)[G4PionZero::PionZero()->GetPDGEncoding()] = new G4PionZeroField(theNucleus);
126 (*theFieldMap)[G4SigmaPlus::SigmaPlus()->GetPDGEncoding()] = new G4SigmaPlusField(theNucleus);
127 (*theFieldMap)[G4SigmaMinus::SigmaMinus()->GetPDGEncoding()] = new G4SigmaMinusField(theNucleus);
128 (*theFieldMap)[G4SigmaZero::SigmaZero()->GetPDGEncoding()] = new G4SigmaZeroField(theNucleus);
129
130 theEquationMap = new std::map <G4int, G4Mag_EqRhs*, std::less<G4int> >;
131
132 // theField needed by the design of G4Mag_eqRhs
133 theField = new G4KM_DummyField; //Field not needed for integration
134 G4KM_OpticalEqRhs * opticalEq;
135 G4KM_NucleonEqRhs * nucleonEq;
136 G4double mass;
137 G4double opticalCoeff;
138
139 nucleonEq = new G4KM_NucleonEqRhs(theField, theNucleus);
140 mass = G4Proton::Proton()->GetPDGMass();
141 nucleonEq->SetMass(mass);
142 (*theEquationMap)[G4Proton::Proton()->GetPDGEncoding()] = nucleonEq;
143
144 nucleonEq = new G4KM_NucleonEqRhs(theField, theNucleus);
145 mass = G4Neutron::Neutron()->GetPDGMass();
146 nucleonEq->SetMass(mass);
147 (*theEquationMap)[G4Neutron::Neutron()->GetPDGEncoding()] = nucleonEq;
148
149 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
150 mass = G4AntiProton::AntiProton()->GetPDGMass();
151 opticalCoeff =
152 (*theFieldMap)[G4AntiProton::AntiProton()->GetPDGEncoding()]->GetCoeff();
153 opticalEq->SetFactor(mass,opticalCoeff);
154 (*theEquationMap)[G4AntiProton::AntiProton()->GetPDGEncoding()] = opticalEq;
155
156 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
157 mass = G4KaonPlus::KaonPlus()->GetPDGMass();
158 opticalCoeff =
159 (*theFieldMap)[G4KaonPlus::KaonPlus()->GetPDGEncoding()]->GetCoeff();
160 opticalEq->SetFactor(mass,opticalCoeff);
161 (*theEquationMap)[G4KaonPlus::KaonPlus()->GetPDGEncoding()] = opticalEq;
162
163 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
164 mass = G4KaonMinus::KaonMinus()->GetPDGMass();
165 opticalCoeff =
166 (*theFieldMap)[G4KaonMinus::KaonMinus()->GetPDGEncoding()]->GetCoeff();
167 opticalEq->SetFactor(mass,opticalCoeff);
168 (*theEquationMap)[G4KaonMinus::KaonMinus()->GetPDGEncoding()] = opticalEq;
169
170 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
171 mass = G4KaonZero::KaonZero()->GetPDGMass();
172 opticalCoeff =
173 (*theFieldMap)[G4KaonZero::KaonZero()->GetPDGEncoding()]->GetCoeff();
174 opticalEq->SetFactor(mass,opticalCoeff);
175 (*theEquationMap)[G4KaonZero::KaonZero()->GetPDGEncoding()] = opticalEq;
176
177 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
178 mass = G4PionPlus::PionPlus()->GetPDGMass();
179 opticalCoeff =
180 (*theFieldMap)[G4PionPlus::PionPlus()->GetPDGEncoding()]->GetCoeff();
181 opticalEq->SetFactor(mass,opticalCoeff);
182 (*theEquationMap)[G4PionPlus::PionPlus()->GetPDGEncoding()] = opticalEq;
183
184 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
185 mass = G4PionMinus::PionMinus()->GetPDGMass();
186 opticalCoeff =
187 (*theFieldMap)[G4PionMinus::PionMinus()->GetPDGEncoding()]->GetCoeff();
188 opticalEq->SetFactor(mass,opticalCoeff);
189 (*theEquationMap)[G4PionMinus::PionMinus()->GetPDGEncoding()] = opticalEq;
190
191 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
192 mass = G4PionZero::PionZero()->GetPDGMass();
193 opticalCoeff =
194 (*theFieldMap)[G4PionZero::PionZero()->GetPDGEncoding()]->GetCoeff();
195 opticalEq->SetFactor(mass,opticalCoeff);
196 (*theEquationMap)[G4PionZero::PionZero()->GetPDGEncoding()] = opticalEq;
197
198 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
199 mass = G4SigmaPlus::SigmaPlus()->GetPDGMass();
200 opticalCoeff =
201 (*theFieldMap)[G4SigmaPlus::SigmaPlus()->GetPDGEncoding()]->GetCoeff();
202 opticalEq->SetFactor(mass,opticalCoeff);
203 (*theEquationMap)[G4SigmaPlus::SigmaPlus()->GetPDGEncoding()] = opticalEq;
204
205 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
206 mass = G4SigmaMinus::SigmaMinus()->GetPDGMass();
207 opticalCoeff =
208 (*theFieldMap)[G4SigmaMinus::SigmaMinus()->GetPDGEncoding()]->GetCoeff();
209 opticalEq->SetFactor(mass,opticalCoeff);
210 (*theEquationMap)[G4SigmaMinus::SigmaMinus()->GetPDGEncoding()] = opticalEq;
211
212 opticalEq = new G4KM_OpticalEqRhs(theField, theNucleus);
213 mass = G4SigmaZero::SigmaZero()->GetPDGMass();
214 opticalCoeff =
215 (*theFieldMap)[G4SigmaZero::SigmaZero()->GetPDGEncoding()]->GetCoeff();
216 opticalEq->SetFactor(mass,opticalCoeff);
217 (*theEquationMap)[G4SigmaZero::SigmaZero()->GetPDGEncoding()] = opticalEq;
218 }
219
220
221 //#define debug_1_RKPropagation 1
222 //----------------------------------------------------------------------------
223 void G4RKPropagation::Transport(G4KineticTrackVector & active,
224 //----------------------------------------------------------------------------
225 const G4KineticTrackVector &,
226 G4double timeStep)
227 {
228 // reset momentum transfer to field
229 theMomentumTranfer=G4ThreeVector(0,0,0);
230
231 // Loop over tracks
232
233 std::vector<G4KineticTrack *>::iterator i;
234 for(i = active.begin(); i != active.end(); ++i)
235 {
236 G4double currTimeStep = timeStep;
237 G4KineticTrack * kt = *i;
238 G4int encoding = kt->GetDefinition()->GetPDGEncoding();
239
240 std::map <G4int, G4VNuclearField*, std::less<G4int> >::iterator fieldIter= theFieldMap->find(encoding);
241
242 G4VNuclearField* currentField=0;
243 if ( fieldIter != theFieldMap->end() ) currentField=fieldIter->second;
244
245 // debug
246 // if ( timeStep > 1e30 ) {
247 // G4cout << " Name :" << kt->GetDefinition()->GetParticleName() << G4endl;
248 // }
249
250 // Get the time of intersections with the nucleus surface.
251 G4double t_enter, t_leave;
252 // if the particle does not intersecate with the nucleus go to next particle
253 if(!GetSphereIntersectionTimes(kt, t_enter, t_leave))
254 {
255 kt->SetState(G4KineticTrack::miss_nucleus);
256 continue;
257 }
258
259
260 #ifdef debug_1_RKPropagation
261 G4cout <<" kt,timeStep, Intersection times tenter, tleave "
262 <<kt<< " / state= " <<kt->GetState() <<" / " <<" "<< currTimeStep << " / " << t_enter << " / " << t_leave <<G4endl;
263 #endif
264
265 // if the particle is already outside nucleus go to next @@GF should never happen? check!
266 // does happen for particles added as late....
267 // if(t_leave < 0 )
268 // {
269 // throw G4HadronicException(__FILE__, __LINE__, "G4RKPropagation:: Attempt to track particle past a nucleus");
270 // continue;
271 // }
272
273 // Apply a straight line propagation for particle types
274 // not included in the model
275 if( ! currentField )
276 {
277 if(currTimeStep == DBL_MAX)currTimeStep = t_leave*1.05;
278 FreeTransport(kt, currTimeStep);
279 if ( currTimeStep >= t_leave )
280 {
281 if ( kt->GetState() == G4KineticTrack::inside )
282 { kt->SetState(G4KineticTrack::gone_out); }
283 else
284 { kt->SetState(G4KineticTrack::miss_nucleus);}
285 } else if (kt->GetState() == G4KineticTrack::outside && currTimeStep >= t_enter ){
286 kt->SetState(G4KineticTrack::inside);
287 }
288
289 continue;
290 }
291
292 if(t_enter > 0) // the particle is out. Transport free to the surface
293 {
294 if(t_enter > currTimeStep) // the particle won't enter the nucleus
295 {
296 FreeTransport(kt, currTimeStep);
297 continue;
298 }
299 else
300 {
301 FreeTransport(kt, t_enter); // go to surface
302 currTimeStep -= t_enter;
303 t_leave -= t_enter; // time left to leave nucleus
304 // on the surface the particle loose the barrier energy
305 // G4double newE = mom.e()-(*theFieldMap)[encoding]->GetBarrier();
306 // GetField = Barrier + FermiPotential
307 G4double newE = kt->GetTrackingMomentum().e()-currentField->GetField(kt->GetPosition());
308
309 if(newE <= kt->GetActualMass()) // the particle cannot enter the nucleus
310 {
311 // FixMe: should be "pushed back?"
312 // for the moment take it past the nucleus, so we'll not worry next time..
313 FreeTransport(kt, 1.1*t_leave); // take past nucleus
314 kt->SetState(G4KineticTrack::miss_nucleus);
315 // G4cout << "G4RKPropagation: Warning particle cannot enter Nucleus :" << G4endl;
316 // G4cout << " enter nucleus, E out/in: " << kt->GetTrackingMomentum().e() << " / " << newE <<G4endl;
317 // G4cout << " the Field "<< currentField->GetField(kt->GetPosition()) << " "<< kt->GetPosition()<<G4endl;
318 // G4cout << " the particle "<<kt->GetDefinition()->GetParticleName()<<G4endl;
319 continue;
320 }
321 //
322 G4double newP = std::sqrt(newE*newE- sqr(kt->GetActualMass()));
323 G4LorentzVector new4Mom(newP*kt->GetTrackingMomentum().vect().unit(), newE);
324 G4ThreeVector transfer(kt->GetTrackingMomentum().vect()-new4Mom.vect());
325 G4ThreeVector boost= transfer / std::sqrt(transfer.mag2() + sqr(theNucleus->GetMass()));
326 new4Mom*=G4LorentzRotation(boost);
327 kt->SetTrackingMomentum(new4Mom);
328 kt->SetState(G4KineticTrack::inside);
329
330 /*
331 G4cout <<" Enter Nucleus - E/Field/Sum: " <<kt->GetTrackingMomentum().e() << " / "
332 << (*theFieldMap)[encoding]->GetField(kt->GetPosition()) << " / "
333 << kt->GetTrackingMomentum().e()-currentField->GetField(kt->GetPosition())
334 << G4endl
335 << " Barrier / field just inside nucleus (0.9999*kt->GetPosition())"
336 << (*theFieldMap)[encoding]->GetBarrier() << " / "
337 << (*theFieldMap)[encoding]->GetField(0.9999*kt->GetPosition())
338 << G4endl;
339 */
340 }
341 }
342
343 // FixMe: should I add a control on theCutOnP here?
344 // Transport the particle into the nucleus
345 // G4cerr << "RKPropagation t_leave, curTimeStep " <<t_leave << " " <<currTimeStep<<G4endl;
346 G4bool is_exiting=false;
347 if(currTimeStep > t_leave) // particle will exit from the nucleus
348 {
349 currTimeStep = t_leave;
350 is_exiting=true;
351 }
352
353 #ifdef debug_1_RKPropagation
354 G4cerr << "RKPropagation is_exiting?, t_leave, curTimeStep " <<is_exiting<<" "<<t_leave << " " <<currTimeStep<<G4endl;
355 G4cout << "RKPropagation Ekin, field, projectile potential, p "
356 << kt->GetTrackingMomentum().e() - kt->GetTrackingMomentum().mag() << " "
357 << kt->GetPosition()<<" "
358 << G4endl << currentField->GetField(kt->GetPosition()) << " "
359 << kt->GetProjectilePotential()<< G4endl
360 << kt->GetTrackingMomentum()
361 << G4endl;
362 #endif
363
364 G4LorentzVector momold=kt->GetTrackingMomentum();
365 G4ThreeVector posold=kt->GetPosition();
366
367 // if (currentField->GetField(kt->GetPosition()) > kt->GetProjectilePotential() ||
368 if (currTimeStep > 0 &&
369 ! FieldTransport(kt, currTimeStep)) {
370 FreeTransport(kt,currTimeStep);
371 }
372
373 #ifdef debug_1_RKPropagation
374 G4cout << "RKPropagation Ekin, field, p "
375 << kt->GetTrackingMomentum().e() - kt->GetTrackingMomentum().mag() << " "
376 << G4endl << currentField->GetField(kt->GetPosition())<< G4endl
377 << kt->GetTrackingMomentum()
378 << G4endl
379 << "delta p " << momold-kt->GetTrackingMomentum() << G4endl
380 << "del pos " << posold-kt->GetPosition()
381 << G4endl;
382 #endif
383
384 // complete the transport
385 // FixMe: in some cases there could be a significant
386 // part to do still in the nucleus, or we stepped to far... depending on
387 // slope of potential
388 G4double t_in=-1, t_out=0; // set onto boundary.
389
390 // should go out, or are already out by a too long step..
391 if(is_exiting ||
392 (GetSphereIntersectionTimes(kt, t_in, t_out) &&t_in<0 && t_out<=0 )) // particle is exiting
393 {
394 if(t_in < 0 && t_out >= 0) //still inside, transport safely out.
395 {
396 // transport free to a position that is surely out of the nucleus, to avoid
397 // a new transportation and a new adding the barrier next loop.
398 G4ThreeVector savePos = kt->GetPosition();
399 FreeTransport(kt, t_out);
400 // and evaluate the right the energy
401 G4double newE=kt->GetTrackingMomentum().e();
402
403 // G4cout << " V pos/savePos << "
404 // << (*theFieldMap)[encoding]->GetField(kt->GetPosition())<< " / "
405 // << (*theFieldMap)[encoding]->GetField(savePos)
406 // << G4endl;
407
408 if ( std::abs(currentField->GetField(savePos)) > 0. &&
409 std::abs(currentField->GetField(kt->GetPosition())) > 0.)
410 { // FixMe GF: savePos/pos may be out of nucleus, where GetField(..)=0
411 // This wrongly adds or subtracts the Barrier here while
412 // this is done later.
413 newE += currentField->GetField(savePos)
414 - currentField->GetField(kt->GetPosition());
415 }
416
417 // G4cout << " go border nucleus, E in/border: " << kt->GetTrackingMomentum() << " / " << newE <<G4endl;
418
419 if(newE < kt->GetActualMass())
420 {
421 #ifdef debug_1_RKPropagation
422 G4cout << "RKPropagation-Transport: problem with particle exiting - ignored" << G4endl;
423 G4cout << " cannot leave nucleus, E in/out: " << kt->GetTrackingMomentum() << " / " << newE <<G4endl;
424 #endif
425 if (kt->GetDefinition() == G4Proton::Proton() ||
426 kt->GetDefinition() == G4Neutron::Neutron() ) {
427 kt->SetState(G4KineticTrack::captured);
428 } else {
429 kt->SetState(G4KineticTrack::gone_out); //@@GF tofix
430 }
431 continue; // the particle cannot exit the nucleus
432 }
433 G4double newP = std::sqrt(newE*newE- sqr(kt->GetActualMass()));
434 G4LorentzVector new4Mom(newP*kt->GetTrackingMomentum().vect().unit(), newE);
435 G4ThreeVector transfer(kt->GetTrackingMomentum().vect()-new4Mom.vect());
436 G4ThreeVector boost= transfer / std::sqrt(transfer.mag2() + sqr(theNucleus->GetMass()));
437 new4Mom*=G4LorentzRotation(boost);
438 kt->SetTrackingMomentum(new4Mom);
439 }
440 // add the potential barrier
441 // FixMe the Coulomb field is not parallel to mom, this is simple approximation
442 G4double newE = kt->GetTrackingMomentum().e()+currentField->GetField(kt->GetPosition());
443 if(newE < kt->GetActualMass())
444 { // the particle cannot exit the nucleus @@@ GF check.
445 #ifdef debug_1_RKPropagation
446 G4cout << " cannot leave nucleus, E in/out: " << kt->GetTrackingMomentum() << " / " << newE <<G4endl;
447 #endif
448 if (kt->GetDefinition() == G4Proton::Proton() ||
449 kt->GetDefinition() == G4Neutron::Neutron() ) {
450 kt->SetState(G4KineticTrack::captured);
451 } else {
452 kt->SetState(G4KineticTrack::gone_out); //@@GF tofix
453 }
454 continue;
455 }
456 G4double newP = std::sqrt(newE*newE- sqr(kt->GetActualMass()));
457 G4LorentzVector new4Mom(newP*kt->GetTrackingMomentum().vect().unit(), newE);
458 G4ThreeVector transfer(kt->GetTrackingMomentum().vect()-new4Mom.vect());
459 G4ThreeVector boost= transfer / std::sqrt(transfer.mag2() + sqr(theNucleus->GetMass()));
460 new4Mom*=G4LorentzRotation(boost);
461 kt->SetTrackingMomentum(new4Mom);
462 kt->SetState(G4KineticTrack::gone_out);
463 }
464
465 }
466
467 }
468
469
470 //----------------------------------------------------------------------------
471 G4ThreeVector G4RKPropagation::GetMomentumTransfer() const
472 //----------------------------------------------------------------------------
473 {
474 return theMomentumTranfer;
475 }
476
477
478 //----------------------------------------------------------------------------
479 G4bool G4RKPropagation::FieldTransport(G4KineticTrack * kt, const G4double timeStep)
480 //----------------------------------------------------------------------------
481 {
482 // G4cout <<"Stepper input"<<kt->GetTrackingMomentum()<<G4endl;
483 // create the integrator stepper
484 // G4Mag_EqRhs * equation = mapIter->second;
485 G4Mag_EqRhs * equation = (*theEquationMap)[kt->GetDefinition()->GetPDGEncoding()];
486 G4MagIntegratorStepper * stepper = new G4ClassicalRK4(equation);
487
488 // create the integrator driver
489 G4double hMin = 1.0e-25*second; // arbitrary choice. Means 0.03 fm at c
490 G4MagInt_Driver * driver = new G4MagInt_Driver(hMin, stepper);
491
492 // Temporary: use driver->AccurateAdvance()
493 // create the G4FieldTrack needed by AccurateAdvance
494 G4double curveLength = 0;
495 G4FieldTrack track(kt->GetPosition(),
496 kt->GetTrackingMomentum().vect().unit(), // momentum direction
497 curveLength, // curvelength
498 kt->GetTrackingMomentum().e()-kt->GetActualMass(), // kinetic energy
499 kt->GetActualMass(), // restmass
500 kt->GetTrackingMomentum().beta()*c_light); // velocity
501 // integrate
502 G4double eps = 0.01;
503 // G4cout << "currTimeStep = " << currTimeStep << G4endl;
504 if(!driver->AccurateAdvance(track, timeStep, eps))
505 { // cannot track this particle
506 #ifdef debug_1_RKPropagation
507 std::cerr << "G4RKPropagation::FieldTransport() warning: integration error."
508 << G4endl << "position " << kt->GetPosition() << " 4mom " <<kt->GetTrackingMomentum()
509 <<G4endl << " timestep " <<timeStep
510 << G4endl;
511 #endif
512 delete driver;
513 delete stepper;
514 return false;
515 }
516 /*
517 G4cout <<" E/Field/Sum be4 : " <<mom.e() << " / "
518 << (*theFieldMap)[encoding]->GetField(pos) << " / "
519 << mom.e()+(*theFieldMap)[encoding]->GetField(pos)
520 << G4endl;
521 */
522
523 // Correct for momentum ( thus energy) transfered to nucleus, boost particle into moving nucleus frame.
524 G4ThreeVector MomentumTranfer = kt->GetTrackingMomentum().vect() - track.GetMomentum();
525 G4ThreeVector boost= MomentumTranfer / std::sqrt (MomentumTranfer.mag2() +sqr(theNucleus->GetMass()));
526
527 // update the kt
528 kt->SetPosition(track.GetPosition());
529 G4LorentzVector mom(track.GetMomentum(),std::sqrt(track.GetMomentum().mag2() + sqr(kt->GetActualMass())));
530 mom *= G4LorentzRotation( boost );
531 theMomentumTranfer += ( kt->GetTrackingMomentum() - mom ).vect();
532 kt->SetTrackingMomentum(mom);
533
534 // G4cout <<"Stepper output"<<kt<<" "<<kt->GetTrackingMomentum()<<" "<<kt->GetPosition()<<G4endl;
535 /*
536 * G4ThreeVector MomentumTranfer2=kt->GetTrackingMomentum().vect() - mom.vect();
537 * G4cout << " MomentumTransfer/corrected" << MomentumTranfer << " " << MomentumTranfer.mag()
538 * << " " << MomentumTranfer2 << " " << MomentumTranfer2.mag() << " "
539 * << MomentumTranfer-MomentumTranfer2 << " "<<
540 * MomentumTranfer-MomentumTranfer2.mag() << " " << G4endl;
541 * G4cout <<" E/Field/Sum aft : " <<mom.e() << " / "
542 * << " / " << (*theFieldMap)[encoding]->GetField(pos)<< " / "
543 * << mom.e()+(*theFieldMap)[encoding]->GetField(pos)
544 * << G4endl;
545 */
546
547 delete driver;
548 delete stepper;
549 return true;
550 }
551
552 //----------------------------------------------------------------------------
553 G4bool G4RKPropagation::FreeTransport(G4KineticTrack * kt, const G4double timeStep)
554 //----------------------------------------------------------------------------
555 {
556 G4ThreeVector newpos = kt->GetPosition() +
557 timeStep*c_light/kt->GetTrackingMomentum().e() * kt->GetTrackingMomentum().vect();
558 kt->SetPosition(newpos);
559 return true;
560 }
561
562 /*
563 G4bool G4RKPropagation::WillBeCaptured(const G4KineticTrack * kt)
564 {
565 G4double radius = theOuterRadius;
566
567 // evaluate the final energy. Il will be captured if newE or newP < 0
568 G4ParticleDefinition * definition = kt->GetDefinition();
569 G4double mass = definition->GetPDGMass();
570 G4ThreeVector pos = kt->GetPosition();
571 G4LorentzVector mom = kt->GetTrackingMomentum();
572 G4VNuclearField * field = (*theFieldMap)[definition->GetPDGEncoding()];
573 G4ThreeVector newPos(0, 0, radius); // to get the field on the surface
574
575 G4double newE = mom.e()+field->GetField(pos)-field->GetField(newPos);
576
577 return ((newE < mass) ? false : true);
578 }
579 */
580
581
582
583 //----------------------------------------------------------------------------
584 G4bool G4RKPropagation::GetSphereIntersectionTimes(const G4double radius,
585 //----------------------------------------------------------------------------
586 const G4ThreeVector & currentPos,
587 const G4LorentzVector & momentum,
588 G4double & t1, G4double & t2)
589 {
590 G4ThreeVector speed = momentum.vect()/momentum.e(); // boost vector
591 G4double scalarProd = currentPos.dot(speed);
592 G4double speedMag2 = speed.mag2();
593 G4double sqrtArg = scalarProd*scalarProd -
594 speedMag2*(currentPos.mag2()-radius*radius);
595 if(sqrtArg <= 0.) // particle will not intersect the sphere
596 {
597 // G4cout << " GetSphereIntersectionTimes sqrtArg negative: " << sqrtArg << G4endl;
598 return false;
599 }
600 t1 = (-scalarProd - std::sqrt(sqrtArg))/speedMag2/c_light;
601 t2 = (-scalarProd + std::sqrt(sqrtArg))/speedMag2/c_light;
602 return true;
603 }
604
605 //----------------------------------------------------------------------------
606 G4bool G4RKPropagation::GetSphereIntersectionTimes(const G4KineticTrack * kt,
607 G4double & t1, G4double & t2)
608 {
609 G4double radius = theOuterRadius + 3*fermi; // "safety" of 3 fermi
610 G4ThreeVector speed = kt->GetTrackingMomentum().vect()/kt->GetTrackingMomentum().e(); // bost vector
611 G4double scalarProd = kt->GetPosition().dot(speed);
612 G4double speedMag2 = speed.mag2();
613 G4double sqrtArg = scalarProd*scalarProd -
614 speedMag2*(kt->GetPosition().mag2()-radius*radius);
615 if(sqrtArg <= 0.) // particle will not intersect the sphere
616 {
617 return false;
618 }
619 t1 = (-scalarProd - std::sqrt(sqrtArg))/speedMag2/c_light;
620 t2 = (-scalarProd + std::sqrt(sqrtArg))/speedMag2/c_light;
621 return true;
622 }
623
624 // Implementation methods
625
626 //----------------------------------------------------------------------------
627 void G4RKPropagation::delete_FieldsAndMap(
628 //----------------------------------------------------------------------------
629 std::map <G4int, G4VNuclearField *, std::less<G4int> > * aMap)
630 {
631 if(aMap)
632 {
633 std::map <G4int, G4VNuclearField *, std::less<G4int> >::iterator cur;
634 for(cur = aMap->begin(); cur != aMap->end(); ++cur)
635 delete (*cur).second;
636
637 aMap->clear();
638 delete aMap;
639 }
640
641 }
642
643 //----------------------------------------------------------------------------
644 void G4RKPropagation::delete_EquationsAndMap(
645 //----------------------------------------------------------------------------
646 std::map <G4int, G4Mag_EqRhs *, std::less<G4int> > * aMap)
647 {
648 if(aMap)
649 {
650 std::map <G4int, G4Mag_EqRhs *, std::less<G4int> >::iterator cur;
651 for(cur = aMap->begin(); cur != aMap->end(); ++cur)
652 delete (*cur).second;
653
654 aMap->clear();
655 delete aMap;
656 }
657 }
658