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, Int_t ntimes)
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 (TestBit(kYRange) && !(Generator->TestBit(kYRange)))
82 Generator->SetYRange(fYMin,fYMax);
83 if (TestBit(kPhiRange) && !(Generator->TestBit(kPhiRange)))
84 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
85 if (TestBit(kThetaRange) && !(Generator->TestBit(kThetaRange)) && !(Generator->TestBit(kEtaRange)))
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 entry->SetNTimes(ntimes);
107 fEntries->Add(entry);
115 void AliGenCocktail::Init()
118 TIter next(fEntries);
119 AliGenCocktailEntry *entry;
121 // Loop over generators and initialize
122 while((entry = (AliGenCocktailEntry*)next())) {
123 if (fStack) entry->Generator()->SetStack(fStack);
124 entry->Generator()->Init();
130 fProb.Set(fNGenerators);
133 while((entry = (AliGenCocktailEntry*)next())) {
134 sum += entry->Rate();
140 while((entry = (AliGenCocktailEntry*)next())) {
141 psum += entry->Rate() / sum;
148 void AliGenCocktail::FinishRun()
151 TIter next(fEntries);
152 AliGenCocktailEntry *entry;
154 // Loop over generators and initialize
155 while((entry = (AliGenCocktailEntry*)next())) {
156 entry->Generator()->FinishRun();
160 void AliGenCocktail::Generate()
164 TIter next(fEntries);
165 AliGenCocktailEntry *entry = 0;
166 AliGenCocktailEntry *preventry = 0;
167 AliGenCocktailEntry *collentry = 0;
168 AliGenerator* gen = 0;
169 if (fHeader) delete fHeader;
172 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
174 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
177 // Generate the vertex position used by all generators
179 if(fVertexSmear == kPerEvent) Vertex();
183 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
187 // Loop over generators and generate events
189 while((entry = (AliGenCocktailEntry*)next())) {
190 Int_t ntimes = entry->NTimes();
191 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
197 entry->SetFirst((partArray->GetEntriesFast())+1);
199 gen = entry->Generator();
200 if (gen->ProvidesCollisionGeometry()) collentry = entry;
202 // Handle case in which current generator needs collision geometry from previous generator
204 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
206 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
208 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
210 Fatal("Generate()", "No Collision Geometry Provided");
214 // Number of signals is calculated from Collision Geometry
215 // and entry with given centrality bin is selected
217 if (entry->Formula() != 0)
220 Fatal("Generate()", "No Collision Geometry Provided");
223 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
224 Float_t b = coll->ImpactParameter();
225 Int_t nsig = Int_t(entry->Formula()->Eval(b));
226 Int_t bin = entry->Bin() - 100;
228 if (bin != nsig) continue;
230 if (nsig < 1) nsig = 1;
231 AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
235 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
237 gen->GenerateN(ntimes);
238 entry->SetLast(partArray->GetEntriesFast());
241 } else if (fSRandom) {
243 // Select a generator randomly
246 Float_t p0 = gRandom->Rndm();
248 for (i = 0; i < fNGenerators; i++) {
249 if (p0 < fProb[i]) break;
252 entry = (AliGenCocktailEntry*) fEntries->At(i);
254 gen = entry->Generator();
255 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
257 entry->SetLast(partArray->GetEntriesFast());
263 fHeader->SetPrimaryVertex(eventVertex);
264 fHeader->CalcNProduced();
266 fHeader->SetName(fName);
267 fContainer->AddHeader(fHeader);
269 gAlice->SetGenEventHeader(fHeader);
273 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
275 // Set vertex smearing and propagate it to the generators
277 AliGenerator::SetVertexSmear(smear);
278 TIter next(fEntries);
279 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
280 entry->Generator()->SetVertexSmear(smear);
284 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
286 // Iterator over generators: Initialisation
287 flnk1 = fEntries->FirstLink();
289 return (AliGenCocktailEntry*) (flnk1->GetObject());
295 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
297 // Iterator over generators: Increment
298 flnk1 = flnk1->Next();
300 return (AliGenCocktailEntry*) (flnk1->GetObject());
306 void AliGenCocktail::
307 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
309 // Iterator over generator pairs: Initialisation
310 flnk2 = flnk1 = fEntries->FirstLink();
312 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
318 void AliGenCocktail::
319 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
321 // Iterator over generators: Increment
322 flnk2 = flnk2->Next();
324 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
325 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
327 flnk2 = flnk1 = flnk1->Next();
329 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
330 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
338 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
340 // Add a header to the list
341 if (fHeader) fHeader->AddHeader(header);