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 **************************************************************************/
16 //_________________________________________________________________________
17 // This is a class that constructs ReconstParticles (reconstructed particles)
20 //-- Authors: Evgeny Karpechev(INR) and Alla Maevsksia
21 //////////////////////////////////////////////////////////////////////////////
23 // --- ROOT system ---
32 // --- Standard library ---
34 #include <Riostream.h>
36 // --- AliRoot header files ---
38 #include "AliRunLoader.h"
39 #include "AliLoader.h"
41 #include "AliFMDdigit.h"
42 #include "AliFMDhit.h"
43 #include "AliFMDReconstParticles.h"
46 #include "AliFMDReconstructor.h"
48 #include "AliConfig.h"
49 #include "AliHeader.h"
50 #include "AliGenEventHeader.h"
52 ClassImp(AliFMDReconstructor)
55 //____________________________________________________________________________
57 void AliFMDReconstructor::Reconstruct(AliRunLoader* runLoader) const
59 //Collects all digits in the same active volume into number of particles
61 Reconstruct number of particles
62 in given group of pads for given FMDvolume
63 determine by numberOfVolume ,
64 numberOfMinSector,numberOfMaxSector,
65 numberOfMinRing, numberOgMaxRing
66 Reconstructor method choose dependence on number of empty pads
71 Info("Exec ","Start");
74 Int_t const knumVolumes=5;
76 Float_t eta, etain,etaout,rad,theta;
77 Int_t ivol, iSector, iRing;
78 Float_t rin[5]={4.2,15.4,4.2,15.4,4.2};
79 Float_t rout[5]={17.4,28.4,17.4,28.4,17.4};
80 Float_t z[5]={-62.8, -75.2, 83.4, 75.2, 340.};
81 Int_t numberOfRings[5]={512,256,512,256,512};
82 Int_t numberOfSectors[5]= {20,40,20,40,20};
83 Int_t numberOfEtaIntervals[5];
84 // number of ring for boundary 0.1 eta
89 Error("Exec","Run Loader loader is NULL - Session not opened");
93 AliLoader* plFMD = runLoader->GetLoader("FMDLoader");
96 Fatal("AliFMDReconstructor","Can not find FMD (loader) in specified event");
97 return;//never reached
100 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
101 if (!runLoader->TreeE()) runLoader->LoadHeader();
103 TDirectory* cwd = gDirectory;
107 for (Int_t j=1; j<=5; j++){
108 sprintf(buf1,"hTotal%d",j);
110 hTotal[j] = new TH2F(buf1," Number of primary particles ",
111 numberOfSectors[j-1],1,numberOfSectors[j-1],
112 numberOfRings[j-1],1,numberOfRings[j-1]);
116 plFMD->LoadRecPoints("RECREATE");
118 Int_t nevents=Int_t (runLoader->TreeE()->GetEntries());
120 cout<<" nevents "<<nevents<<endl;
122 for(Int_t ievent=0;ievent<nevents;ievent++)
125 cout<<" *** event "<<ievent<<endl;
127 runLoader->GetEvent(ievent) ;
128 //event z-vertex for correction eta-rad dependence
129 AliHeader *header = runLoader->GetHeader();
130 AliGenEventHeader* genHeader = header->GenEventHeader();
131 TArrayF *o = new TArrayF(3);
132 if (genHeader) genHeader->PrimaryVertex(*o);
133 Float_t zVertex=o->At(2);
135 for (Int_t i=0; i<5; i++)
136 hTotal[i+1]->Reset();
138 retval = plFMD->LoadDigits("READ");
141 Error("Exec","Error occured while loading digits. Exiting.");
145 AliFMD * fFMD = (AliFMD *)gAlice->GetDetector("FMD");
146 TClonesArray *fReconParticles=fFMD->ReconParticles();
147 TClonesArray *fDigits=fFMD->Digits();
149 TTree* treeD = plFMD->TreeD();
152 Error("Exec","Can not get Tree with Digits. Nothing to reconstruct - Exiting");
158 brDigits=treeD->GetBranch("FMD");
161 brDigits->SetAddress(&fDigits);
163 cerr<<"EXEC Branch FMD digits not found"<<endl;
167 if(plFMD->TreeR()==0) plFMD->MakeTree("R");
170 fFMD->MakeBranch("R");
175 AliFMDdigit *fmdDigit;
178 plFMD->TreeD()->GetEvent(0);
180 Int_t nDigits=fDigits->GetEntries();
181 Int_t recParticles[6];
184 Int_t numberOfPads=0;
186 Float_t channelWidth=(22400*50)/1024;
187 for (Int_t digit=0;digit<nDigits;digit++)
189 fmdDigit=(AliFMDdigit*)fDigits->UncheckedAt(digit);
190 ivol=fmdDigit->Volume();
191 iSector=fmdDigit->NumberOfSector();
192 iRing=fmdDigit->NumberOfRing();
193 pedestal=Int_t(gRandom->Gaus(500,250));
194 padADC= fmdDigit->ADCsignal()
195 -Int_t(Float_t(pedestal)/channelWidth);
196 if (padADC<0) padADC=0;
197 hTotal[ivol]->Fill(iSector,iRing,padADC);
200 //reconstruct multiplicity in 0.1 eta according Poisson distribution
202 Int_t rmin=0; Int_t rmax=0;
203 Int_t smin=0; Int_t smax=0;
204 for (ivol=0; ivol<knumVolumes; ivol++)
206 Float_t ring2number=Float_t (numberOfRings[ivol])/
207 (rout[ivol]-rin[ivol]);
208 Float_t realZ=zVertex+z[ivol];
209 theta=TMath::ATan(rout[ivol]/TMath::Abs(realZ));
210 etain = - TMath::Log( TMath::Tan(theta/2.));
211 theta=TMath::ATan(rin[ivol]/TMath::Abs(realZ));
212 etaout=- TMath::Log( TMath::Tan(theta/2.));
213 numberOfEtaIntervals[ivol]=Int_t((etaout-etain)*10)-1;
215 for (Int_t e1=0;e1<=numberOfEtaIntervals[ivol];e1++)
217 theta = 2.*TMath::ATan (TMath::Exp (-eta));
218 Float_t radmin = TMath::Abs(realZ) * (TMath::Tan (theta));
219 rmax= Int_t ( (radmin-rin[ivol])*ring2number+0.5);
221 theta = 2.*TMath::ATan (TMath::Exp (-eta));
222 rad = TMath::Abs(realZ) * (TMath::Tan (theta));
223 rmin=Int_t( (rad-rin[ivol])*ring2number+0.5);
227 smax=numberOfSectors[ivol];
228 numberOfPads=(rmax-rmin)*(smax-smin);
229 for (Int_t iring=rmin; iring<rmax; iring++)
233 isector<numberOfSectors[ivol];
236 if(hTotal[ivol+1]->GetBinContent(isector+1,iring+1)
237 <zeroADC) zeroPads++;}
240 Float_t numberOfPads=Float_t(smax-smin)*Float_t(rmax-rmin);
242 Double_t lambda=-TMath::Log(Double_t(zeroPads)/numberOfPads);
243 Int_t fRecon=Int_t (lambda*numberOfPads+0.5);
244 recParticles[0]=ivol+1;
245 recParticles[1]=smin;
246 recParticles[2]=smax;
247 recParticles[3]=rmin;
248 recParticles[4]=rmax;
249 recParticles[5]= fRecon;
250 new((*fReconParticles)[nRecPart++]) AliFMDReconstParticles(recParticles);
257 plFMD->TreeR()->Reset();
258 plFMD->TreeR()->Fill();
259 plFMD->WriteRecPoints("OVERWRITE");
260 plFMD->UnloadDigits();
262 plFMD->UnloadRecPoints();
264 Info(" Exec"," finished");
266 // delete hTotal[10];
271 //_____________________________________________________________________________
272 void AliFMDReconstructor::FillESD(AliRunLoader* /*runLoader*/,
273 AliESD* /*esd*/) const
275 // nothing to be done