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),
55 fTitle= "Particle Generator using cocktail of generators";
58 AliGenCocktail::~AliGenCocktail()
63 // delete fHeader; // It is removed in AliRunLoader
68 AddGenerator(AliGenerator *Generator, const char* Name, Float_t RateExp, TFormula* formula, Int_t ntimes)
71 // Add a generator to the list
72 // First check that list exists
73 if (!fEntries) fEntries = new TList();
74 fTotalRate += RateExp;
76 // Forward parameters to the new generator
77 if(TestBit(kPtRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
78 Generator->SetPtRange(fPtMin,fPtMax);
79 if(TestBit(kMomentumRange) && !(Generator->TestBit(kPtRange)) && !(Generator->TestBit(kMomentumRange)))
80 Generator->SetMomentumRange(fPMin,fPMax);
82 if (TestBit(kYRange) && !(Generator->TestBit(kYRange)))
83 Generator->SetYRange(fYMin,fYMax);
84 if (TestBit(kPhiRange) && !(Generator->TestBit(kPhiRange)))
85 Generator->SetPhiRange(fPhiMin*180/TMath::Pi(),fPhiMax*180/TMath::Pi());
86 if (TestBit(kThetaRange) && !(Generator->TestBit(kThetaRange)) && !(Generator->TestBit(kEtaRange)))
87 Generator->SetThetaRange(fThetaMin*180/TMath::Pi(),fThetaMax*180/TMath::Pi());
88 if (!(Generator->TestBit(kVertexRange))) {
89 Generator->SetOrigin(fOrigin[0], fOrigin[1], fOrigin[2]);
90 Generator->SetSigma(fOsigma[0], fOsigma[1], fOsigma[2]);
91 Generator->SetVertexSmear(fVertexSmear);
92 Generator->SetVertexSource(kContainer);
94 Generator->SetTrackingFlag(fTrackIt);
95 Generator->SetContainer(this);
99 // Add generator to list
101 snprintf(theName, 256, "%s_%d",Name, fNGenerators);
102 Generator->SetName(theName);
104 AliGenCocktailEntry *entry =
105 new AliGenCocktailEntry(Generator, Name, RateExp);
106 if (formula) entry->SetFormula(formula);
107 entry->SetNTimes(ntimes);
108 fEntries->Add(entry);
116 void AliGenCocktail::Init()
119 TIter next(fEntries);
120 AliGenCocktailEntry *entry;
122 // Loop over generators and initialize
123 while((entry = (AliGenCocktailEntry*)next())) {
124 if (fStack) entry->Generator()->SetStack(fStack);
125 entry->Generator()->SetSeed(fSeed);
126 entry->Generator()->Init();
132 fProb.Set(fNGenerators);
135 while((entry = (AliGenCocktailEntry*)next())) {
136 sum += entry->Rate();
142 while((entry = (AliGenCocktailEntry*)next())) {
143 psum += entry->Rate() / sum;
150 void AliGenCocktail::FinishRun()
153 TIter next(fEntries);
154 AliGenCocktailEntry *entry;
156 // Loop over generators and initialize
157 while((entry = (AliGenCocktailEntry*)next())) {
158 entry->Generator()->FinishRun();
162 void AliGenCocktail::Generate()
166 TIter next(fEntries);
167 AliGenCocktailEntry *entry = 0;
168 AliGenCocktailEntry *preventry = 0;
169 AliGenCocktailEntry *collentry = 0;
170 AliGenerator* gen = 0;
171 if (fHeader) delete fHeader;
174 fHeader = new AliGenCocktailEventHeader("Cocktail Header");
176 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
179 // Generate the vertex position used by all generators
181 if(fVertexSmear == kPerEvent) Vertex();
185 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
189 // Loop over generators and generate events
191 while((entry = (AliGenCocktailEntry*)next())) {
192 Int_t ntimes = entry->NTimes();
193 if (fUsePerEventRate && (gRandom->Rndm() > entry->Rate())) continue;
199 entry->SetFirst((partArray->GetEntriesFast())+1);
201 gen = entry->Generator();
202 if (gen->ProvidesCollisionGeometry()) collentry = entry;
204 // Handle case in which current generator needs collision geometry from previous generator
206 if (gen->NeedsCollisionGeometry() && (entry->Formula() == 0))
208 if (preventry && preventry->Generator()->ProvidesCollisionGeometry())
210 gen->SetCollisionGeometry(preventry->Generator()->CollisionGeometry());
212 Fatal("Generate()", "No Collision Geometry Provided");
216 // Number of signals is calculated from Collision Geometry
217 // and entry with given centrality bin is selected
219 if (entry->Formula() != 0)
222 Fatal("Generate()", "No Collision Geometry Provided");
225 AliCollisionGeometry* coll = (collentry->Generator())->CollisionGeometry();
226 Float_t b = coll->ImpactParameter();
227 Int_t nsig = Int_t(entry->Formula()->Eval(b));
228 Int_t bin = entry->Bin() - 100;
230 if (bin != nsig) continue;
232 if (nsig < 1) nsig = 1;
233 AliInfo(Form("Signal Events %13.3f %5d %5d\n", b, coll->HardScatters(), nsig));
237 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
239 gen->GenerateN(ntimes);
240 entry->SetLast(partArray->GetEntriesFast());
243 } else if (fSRandom) {
245 // Select a generator randomly
248 Float_t p0 = gRandom->Rndm();
250 for (i = 0; i < fNGenerators; i++) {
251 if (p0 < fProb[i]) break;
254 entry = (AliGenCocktailEntry*) fEntries->At(i);
256 gen = entry->Generator();
257 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2), fTime);
259 entry->SetLast(partArray->GetEntriesFast());
265 fHeader->SetPrimaryVertex(eventVertex);
266 fHeader->CalcNProduced();
268 fHeader->SetName(fName);
269 fContainer->AddHeader(fHeader);
271 gAlice->SetGenEventHeader(fHeader);
275 void AliGenCocktail::SetVertexSmear(VertexSmear_t smear)
277 // Set vertex smearing and propagate it to the generators
279 AliGenerator::SetVertexSmear(smear);
280 TIter next(fEntries);
281 while (AliGenCocktailEntry* entry = (AliGenCocktailEntry*)next()) {
282 entry->Generator()->SetVertexSmear(smear);
286 AliGenCocktailEntry * AliGenCocktail::FirstGenerator()
288 // Iterator over generators: Initialisation
289 flnk1 = fEntries->FirstLink();
291 return (AliGenCocktailEntry*) (flnk1->GetObject());
297 AliGenCocktailEntry* AliGenCocktail::NextGenerator()
299 // Iterator over generators: Increment
300 flnk1 = flnk1->Next();
302 return (AliGenCocktailEntry*) (flnk1->GetObject());
308 void AliGenCocktail::
309 FirstGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
311 // Iterator over generator pairs: Initialisation
312 flnk2 = flnk1 = fEntries->FirstLink();
314 e2 = e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
320 void AliGenCocktail::
321 NextGeneratorPair(AliGenCocktailEntry*& e1, AliGenCocktailEntry*& e2)
323 // Iterator over generators: Increment
324 flnk2 = flnk2->Next();
326 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
327 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
329 flnk2 = flnk1 = flnk1->Next();
331 e1 = (AliGenCocktailEntry*) (flnk1->GetObject());
332 e2 = (AliGenCocktailEntry*) (flnk2->GetObject());
340 void AliGenCocktail::AddHeader(AliGenEventHeader* header)
342 // Add a header to the list
343 if (fHeader) fHeader->AddHeader(header);