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26 //
27 //
28
29 // ------------------------------------------------------------
30 // GEANT 4 class implementation file
31 //
32 // ---------------- G4FTFParticipants----------------
33 // by Gunter Folger, June 1998.
34 // class finding colliding particles in FTFPartonStringModel
35 // Changed in a part by V. Uzhinsky in oder to put in correcpondence
36 // with original FRITIOF mode. November - December 2006.
37 // Ajusted for (anti) nucleus - nucleus interactions by V. Uzhinsky.
38 // (February 2011)
39 // ------------------------------------------------------------
40
41 #include <utility>
42 #include <vector>
43 #include <algorithm>
44
45 #include "G4FTFParticipants.hh"
46 #include "G4ios.hh"
47 #include "Randomize.hh"
48 #include "G4SystemOfUnits.hh"
49 #include "G4FTFParameters.hh"
50 #include "G4DiffractiveSplitableHadron.hh"
51 #include "G4VSplitableHadron.hh"
52 #include "G4PhysicalConstants.hh"
53
54
55 //============================================================================
56
57 //#define debugFTFparticipant
58
59
60 //============================================================================
61
62 G4FTFParticipants::G4FTFParticipants() : Bimpact( 0.0 ), BinInterval( false ),
63 Bmin2( -1.0 ), Bmax2( -1.0 ),
64 currentInteraction( -1 )
65 {}
66
67
68 //============================================================================
69
70 G4FTFParticipants::~G4FTFParticipants() {}
71
72 //============================================================================
73
74 void G4FTFParticipants::GetList( const G4ReactionProduct& thePrimary,
75 G4FTFParameters* theParameters ) {
76
77 #ifdef debugFTFparticipant
78 G4cout << "Participants::GetList" << G4endl
79 << "thePrimary " << thePrimary.GetMomentum() << G4endl << G4endl;
80 #endif
81
82 G4double betta_z = thePrimary.GetMomentum().z() / thePrimary.GetTotalEnergy();
83 if ( betta_z < 1.0e-10 ) betta_z = 1.0e-10;
84
85 StartLoop(); // reset Loop over Interactions
86
87 for ( unsigned int i = 0; i < theInteractions.size(); i++ ) delete theInteractions[i];
88 theInteractions.clear();
89
90 G4double deltaxy = 2.0 * fermi; // Extra nuclear radius
91
92 if ( theProjectileNucleus == nullptr ) { // Hadron-nucleus or anti-baryon-nucleus interactions
93
94 G4double impactX( 0.0 ), impactY( 0.0 );
95 G4double B( 0.0 ), B2( 0.0 );
96
97 G4VSplitableHadron* primarySplitable = new G4DiffractiveSplitableHadron( thePrimary );
98
99 #ifdef debugFTFparticipant
100 G4cout << "Hadron-nucleus or anti-baryon-nucleus interactions" << G4endl;
101 #endif
102
103 G4double xyradius = theNucleus->GetOuterRadius() + deltaxy; // Range of impact parameter sampling
104
105 const G4int maxNumberOfLoops = 1000;
106 G4int loopCounter = 0;
107 do {
108
109 std::pair< G4double, G4double > theImpactParameter;
110 if ( SampleBinInterval() ) {
111 B2 = GetBmin2() + G4UniformRand() * ( GetBmax2() - GetBmin2() );
112 B = B2 > 0.0 ? std::sqrt( B2 ) : 0.0;
113 G4double Phi = twopi * G4UniformRand();
114 impactX = B * std::cos( Phi );
115 impactY = B * std::sin( Phi );
116 SetImpactParameter( B );
117 } else {
118 theImpactParameter = theNucleus->ChooseImpactXandY( xyradius );
119 impactX = theImpactParameter.first;
120 impactY = theImpactParameter.second;
121 SetImpactParameter( std::sqrt( sqr(impactX) + sqr(impactY) ) );
122 }
123
124 #ifdef debugFTFparticipant
125 G4cout << "New interaction list," << " b[fm]= "
126 << std::sqrt( sqr(impactX ) + sqr( impactY ) )/fermi << G4endl;
127 #endif
128
129 G4ThreeVector thePosition( impactX, impactY, 0.0 );
130 primarySplitable->SetPosition( thePosition );
131
132 theNucleus->StartLoop();
133 G4Nucleon* nucleon;
134
135 #ifdef debugFTFparticipant
136 G4int TrN( 0 );
137 #endif
138
139 while ( ( nucleon = theNucleus->GetNextNucleon() ) ) { /* Loop checking, 10.08.2015, A.Ribon */
140
141 G4double impact2 = sqr( impactX - nucleon->GetPosition().x() ) +
142 sqr( impactY - nucleon->GetPosition().y() );
143
144 if ( theParameters->GetProbabilityOfInteraction( impact2/fermi/fermi ) >
145 G4UniformRand() ) {
146 primarySplitable->SetStatus( 1 ); // It takes part in the interaction
147 G4VSplitableHadron* targetSplitable = 0;
148 if ( ! nucleon->AreYouHit() ) {
149 targetSplitable = new G4DiffractiveSplitableHadron( *nucleon );
150 nucleon->Hit( targetSplitable );
151 targetSplitable->SetStatus( 1 ); // It takes part in the interaction
152
153 #ifdef debugFTFparticipant
154 G4cout << "Participated nucleons #, " << TrN << " " << "Splitable Pr* Tr* "
155 << primarySplitable << " " << targetSplitable << G4endl;
156 #endif
157
158 }
159 G4InteractionContent* aInteraction = new G4InteractionContent( primarySplitable );
160 G4Nucleon* PrNucleon = 0;
161 aInteraction->SetProjectileNucleon( PrNucleon );
162 aInteraction->SetTarget( targetSplitable );
163 aInteraction->SetTargetNucleon( nucleon );
164 aInteraction->SetStatus( 1 );
165 aInteraction->SetInteractionTime( ( primarySplitable->GetPosition().z() +
166 nucleon->GetPosition().z() ) / betta_z );
167 theInteractions.push_back( aInteraction );
168 }
169
170 #ifdef debugFTFparticipant
171 TrN++;
172 #endif
173
174 }
175
176 } while ( ( theInteractions.size() == 0 ) &&
177 ++loopCounter < maxNumberOfLoops ); /* Loop checking, 10.08.2015, A.Ribon */
178 if ( loopCounter >= maxNumberOfLoops ) {
179 #ifdef debugFTFparticipant
180 G4cout << "BAD situation: forced exit from the while loop!" << G4endl;
181 #endif
182 return;
183 }
184
185 #ifdef debugFTFparticipant
186 G4cout << "Number of Hit nucleons " << theInteractions.size() << "\t Bx[fm] " << impactX/fermi
187 << "\t By[fm] " << impactY/fermi << "\t B[fm] "
188 << std::sqrt( sqr( impactX ) + sqr( impactY ) )/fermi << G4endl << G4endl;
189 #endif
190
191 //SortInteractionsIncT(); // Not need because nucleons are sorted in increasing z-coordinates.
192 ShiftInteractionTime(); // To put correct times and z-coordinates
193 return;
194
195 } // end of if ( theProjectileNucleus == 0 )
196
197 // Projectile and target are nuclei
198
199 #ifdef debugFTFparticipant
200 G4cout << "Projectile and target are nuclei" << G4endl;
201 #endif
202
203 //G4cout<<theProjectileNucleus->GetOuterRadius()/fermi<<" "<<theNucleus->GetOuterRadius()/fermi<<" "<<deltaxy/fermi<<G4endl;
204
205 // Range of impact parameter sampling
206 G4double xyradius = theProjectileNucleus->GetOuterRadius() + theNucleus->GetOuterRadius() + deltaxy;
207
208 G4double impactX( 0.0 ), impactY( 0.0 );
209 G4double B( 0.0 ), B2( 0.0 );
210
211 const G4int maxNumberOfLoops = 1000;
212 G4int loopCounter = 0;
213 do {
214
215 std::pair< G4double, G4double > theImpactParameter;
216 if ( SampleBinInterval() ) {
217 B2 = GetBmin2() + G4UniformRand() * ( GetBmax2() - GetBmin2() );
218 B = B2 > 0.0 ? std::sqrt( B2 ) : 0.0; // In G4 internal units (mm)
219 G4double Phi = twopi * G4UniformRand();
220 impactX = B * std::cos( Phi );
221 impactY = B * std::sin( Phi );
222 SetImpactParameter( B );
223 } else {
224 theImpactParameter = theNucleus->ChooseImpactXandY( xyradius );
225 impactX = theImpactParameter.first;
226 impactY = theImpactParameter.second;
227 SetImpactParameter( std::sqrt( sqr(impactX) + sqr(impactY) ) );
228 }
229
230 #ifdef debugFTFparticipant
231 G4cout << "New interaction list, " << "b[fm] "
232 << std::sqrt( sqr( impactX ) + sqr( impactY ) )/fermi << G4endl;
233 #endif
234
235 G4ThreeVector theBeamPosition( impactX, impactY, 0.0 );
236
237 theProjectileNucleus->StartLoop();
238 G4Nucleon* ProjectileNucleon;
239
240 #ifdef debugFTFparticipant
241 G4int PrNuclN( 0 );
242 #endif
243
244 while ( ( ProjectileNucleon = theProjectileNucleus->GetNextNucleon() ) ) { /* Loop checking, 10.08.2015, A.Ribon */
245
246 G4VSplitableHadron* ProjectileSplitable = 0;
247 theNucleus->StartLoop();
248 G4Nucleon* TargetNucleon = 0;
249
250 #ifdef debugFTFparticipant
251 G4int TrNuclN( 0 );
252 #endif
253
254 while ( ( TargetNucleon = theNucleus->GetNextNucleon() ) ) { /* Loop checking, 10.08.2015, A.Ribon */
255
256 G4double impact2 = sqr( impactX + ProjectileNucleon->GetPosition().x() -
257 TargetNucleon->GetPosition().x() ) +
258 sqr( impactY + ProjectileNucleon->GetPosition().y() -
259 TargetNucleon->GetPosition().y() );
260 G4VSplitableHadron* TargetSplitable = 0;
261 if ( theParameters->GetProbabilityOfInteraction( impact2/fermi/fermi ) >
262 G4UniformRand() ) { // An interaction has happend!
263
264 #ifdef debugFTFparticipant
265 G4cout << G4endl << "An Interaction has happend" << G4endl << "Proj N mom " << PrNuclN
266 << " " << ProjectileNucleon->Get4Momentum() << "-------------" << G4endl
267 << "Targ N mom " << TrNuclN << " " << TargetNucleon->Get4Momentum() << G4endl
268 << "PrN TrN Z coords [fm]" << ProjectileNucleon->GetPosition().z()/fermi
269 << " " << TargetNucleon->GetPosition().z()/fermi
270 << " " << ProjectileNucleon->GetPosition().z()/fermi +
271 TargetNucleon->GetPosition().z()/fermi << G4endl;
272 #endif
273
274 if ( ! ProjectileNucleon->AreYouHit() ) {
275 // Projectile nucleon was not involved until now.
276 ProjectileSplitable = new G4DiffractiveSplitableHadron( *ProjectileNucleon );
277 ProjectileNucleon->Hit( ProjectileSplitable );
278 ProjectileSplitable->SetStatus( 1 ); // It takes part in the interaction
279 } else { // Projectile nucleon was involved before.
280 ProjectileSplitable = ProjectileNucleon->GetSplitableHadron();
281 }
282
283 if ( ! TargetNucleon->AreYouHit() ) { // Target nucleon was not involved until now
284 TargetSplitable = new G4DiffractiveSplitableHadron( *TargetNucleon );
285 TargetNucleon->Hit( TargetSplitable );
286 TargetSplitable->SetStatus( 1 ); // It takes part in the interaction
287 } else { // Target nucleon was involved before.
288 TargetSplitable = TargetNucleon->GetSplitableHadron();
289 }
290
291 G4InteractionContent* anInteraction = new G4InteractionContent( ProjectileSplitable );
292 anInteraction->SetTarget( TargetSplitable );
293 anInteraction->SetProjectileNucleon( ProjectileNucleon );
294 anInteraction->SetTargetNucleon( TargetNucleon );
295 anInteraction->SetInteractionTime( ( ProjectileNucleon->GetPosition().z() +
296 TargetNucleon->GetPosition().z() ) / betta_z );
297 anInteraction->SetStatus( 1 );
298
299 #ifdef debugFTFparticipant
300 G4cout << "Part anInteraction->GetInteractionTime() [fm] "
301 << anInteraction->GetInteractionTime()/fermi << G4endl
302 << "Splitable Pr* Tr* " << ProjectileSplitable << " "
303 << TargetSplitable << G4endl;
304 #endif
305
306 theInteractions.push_back( anInteraction );
307
308 } // End of an Interaction has happend!
309
310 #ifdef debugFTFparticipant
311 TrNuclN++;
312 #endif
313
314 } // End of while ( ( TargetNucleon = theNucleus->GetNextNucleon() ) )
315
316 #ifdef debugFTFparticipant
317 PrNuclN++;
318 #endif
319
320 } // End of while ( ( ProjectileNucleon = theProjectileNucleus->GetNextNucleon() ) )
321
322 if ( theInteractions.size() != 0 ) theProjectileNucleus->DoTranslation( theBeamPosition );
323
324 } while ( ( theInteractions.size() == 0 ) &&
325 ++loopCounter < maxNumberOfLoops ); /* Loop checking, 10.08.2015, A.Ribon */
326 if ( loopCounter >= maxNumberOfLoops ) {
327 #ifdef debugFTFparticipant
328 G4cout << "BAD situation: forced exit from the while loop!" << G4endl;
329 #endif
330 return;
331 }
332
333 SortInteractionsIncT();
334 ShiftInteractionTime();
335
336 #ifdef debugFTFparticipant
337 G4cout << G4endl << "Number of primary collisions " << theInteractions.size()
338 << "\t Bx[fm] " << impactX/fermi << "\t By[fm] " << impactY/fermi
339 << "\t B[fm] " << std::sqrt( sqr( impactX ) + sqr( impactY ) )/fermi << G4endl
340 << "FTF participant End. #######################" << G4endl << G4endl;
341 #endif
342 return;
343 }
344
345
346 //============================================================================
347
348 bool G4FTFPartHelperForSortInT( const G4InteractionContent* Int1,
349 const G4InteractionContent* Int2 ) {
350 return Int1->GetInteractionTime() < Int2->GetInteractionTime();
351 }
352
353
354 //============================================================================
355
356 void G4FTFParticipants::SortInteractionsIncT() { // on increased T
357 if ( theInteractions.size() < 2 ) return; // Avoid unnecesary work
358 std::sort( theInteractions.begin(), theInteractions.end(), G4FTFPartHelperForSortInT );
359 }
360
361
362 //============================================================================
363
364 void G4FTFParticipants::ShiftInteractionTime() {
365 G4double InitialTime = theInteractions[0]->GetInteractionTime();
366 for ( unsigned int i = 1; i < theInteractions.size(); i++ ) {
367 G4double InterTime = theInteractions[i]->GetInteractionTime() - InitialTime;
368 theInteractions[i]->SetInteractionTime( InterTime );
369 G4InteractionContent* aCollision = theInteractions[i];
370 G4VSplitableHadron* projectile = aCollision->GetProjectile();
371 G4VSplitableHadron* target = aCollision->GetTarget();
372 G4ThreeVector prPosition = projectile->GetPosition();
373 prPosition.setZ( target->GetPosition().z() );
374 projectile->SetPosition( prPosition );
375 projectile->SetTimeOfCreation( InterTime );
376 target->SetTimeOfCreation( InterTime );
377 }
378 return;
379 }
380
381
382 //============================================================================
383
384 void G4FTFParticipants::Clean() {
385 for ( size_t i = 0; i < theInteractions.size(); i++ ) {
386 if ( theInteractions[ i ] ) {
387 delete theInteractions[ i ];
388 theInteractions[ i ] = 0;
389 }
390 }
391 theInteractions.clear();
392 currentInteraction = -1;
393 }
394
395