1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // Container class for AliGenerator through recursion.
19 // Container is itself an AliGenerator.
20 // What is stored are not the pointers to the generators directly but to objects of type
21 // AliGenCocktail entry.
22 // The class provides also iterator functionality.
23 // Author: andreas.morsch@cern.ch
27 #include <TObjArray.h>
30 #include "AliGenCocktail.h"
31 #include "AliGenCocktailEntry.h"
32 #include "AliCollisionGeometry.h"
36 #include "AliGenCocktailEventHeader.h"
38 ClassImp(AliGenCocktail)
40 AliGenCocktail::AliGenCocktail()
45 fUsePerEventRate(kFALSE),
54 fTitle= "Particle Generator using cocktail of generators";
57 AliGenCocktail::~AliGenCocktail()
62 // delete fHeader; // It is removed in AliRunLoader
67 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula)
70 // Add a generator to the list
71 // First check that list exists
72 if (!fEntries) fEntries = new TList();
73 fTotalRate += RateExp;
75 // Forward parameters to the new generator
76 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
77 Generator->SetPtRange(fPtMin,fPtMax);
78 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
79 Generator->SetMomentumRange(fPMin,fPMax);
81 if (!(Generator->TestBit(kYRange)))
82 Generator->SetYRange(fYMin,fYMax);
83 if (!(Generator->TestBit(kPhiRange)))
84 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
85 if (!(Generator->TestBit(kThetaRange)))
86 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
87 if (!(Generator->TestBit(kVertexRange))) {
88 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
89 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
90 Generator->SetVertexSmear(fVertexSmear);
91 Generator->SetVertexSource(kContainer);
93 Generator->SetTrackingFlag(fTrackIt);
94 Generator->SetContainer(this);
98 // Add generator to list
100 snprintf(theName, 256, "%s_%d",Name, fNGenerators);
101 Generator->SetName(theName);
103 AliGenCocktailEntry *entry =
104 new AliGenCocktailEntry(Generator, Name, RateExp);
105 if (formula) entry->SetFormula(formula);
106 fEntries->Add(entry);
114 void AliGenCocktail::Init()
117 TIter next(fEntries);
118 AliGenCocktailEntry *entry;
120 // Loop over generators and initialize
121 while((entry = (AliGenCocktailEntry*)next())) {
122 if (fStack) entry->Generator()->SetStack(fStack);
123 entry->Generator()->Init();
129 fProb.Set(fNGenerators);
132 while((entry = (AliGenCocktailEntry*)next())) {
133 sum += entry->Rate();
139 while((entry = (AliGenCocktailEntry*)next())) {
140 psum += entry->Rate() / sum;
147 void AliGenCocktail::FinishRun()
150 TIter next(fEntries);
151 AliGenCocktailEntry *entry;
153 // Loop over generators and initialize
154 while((entry = (AliGenCocktailEntry*)next())) {
155 entry->Generator()->FinishRun();
159 void AliGenCocktail::Generate()
163 TIter next(fEntries);
164 AliGenCocktailEntry *entry = 0;
165 AliGenCocktailEntry *preventry = 0;
166 AliGenCocktailEntry *collentry = 0;
167 AliGenerator* gen = 0;
168 if (fHeader) delete fHeader;
171 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
173 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
176 // Generate the vertex position used by all generators
178 if(fVertexSmear == kPerEvent) Vertex();
182 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
186 // Loop over generators and generate events
188 while((entry = (AliGenCocktailEntry*)next())) {
189 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
195 entry->SetFirst((partArray->GetEntriesFast())+1);
197 gen = entry->Generator();
198 if (gen->ProvidesCollisionGeometry()) collentry = entry;
200 // Handle case in which current generator needs collision geometry from previous generator
202 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
204 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
206 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
208 Fatal("Generate()", "No Collision Geometry Provided");
212 // Number of signals is calculated from Collision Geometry
214 if (entry->Formula() != 0)
217 Fatal("Generate()", "No Collision Geometry Provided");
220 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
221 Float_t b = coll->ImpactParameter();
222 Int_t nsig = Int_t(entry->Formula()->Eval(b));
223 if (nsig < 1) nsig = 1;
224 AliInfo(Form("Signal Events %13.3f %5d\n", b, nsig));
225 gen->SetNumberParticles(nsig);
228 entry->Generator()->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
229 entry->Generator()->Generate();
230 entry->SetLast(partArray->GetEntriesFast());
233 } else if (fRandom) {
235 // Select a generator randomly
238 Float_t p0 = gRandom->Rndm();
240 for (i = 0; i < fNGenerators; i++) {
241 if (p0 < fProb[i]) break;
244 entry = (AliGenCocktailEntry*) fEntries->At(i);
246 gen = entry->Generator();
247 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
249 entry->SetLast(partArray->GetEntriesFast());
255 fHeader->SetPrimaryVertex(eventVertex);
256 fHeader->CalcNProduced();
257 gAlice->SetGenEventHeader(fHeader);
260 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
262 // Set vertex smearing and propagate it to the generators
264 AliGenerator::SetVertexSmear(smear);
265 TIter next(fEntries);
266 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
267 entry->Generator()->SetVertexSmear(smear);
271 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
273 // Iterator over generators: Initialisation
274 flnk1 = fEntries->FirstLink();
276 return (AliGenCocktailEntry*) (flnk1->GetObject());
282 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
284 // Iterator over generators: Increment
285 flnk1 = flnk1->Next();
287 return (AliGenCocktailEntry*) (flnk1->GetObject());
293 void AliGenCocktail::
294 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
296 // Iterator over generator pairs: Initialisation
297 flnk2 = flnk1 = fEntries->FirstLink();
299 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
305 void AliGenCocktail::
306 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
308 // Iterator over generators: Increment
309 flnk2 = flnk2->Next();
311 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
312 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
314 flnk2 = flnk1 = flnk1->Next();
316 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
317 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
325 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
327 // Add a header to the list
328 if (fHeader) fHeader->AddHeader(header);