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 ///_________________________________________________________________________
18 /// This class constructs Digits out of Hits
22 // --- Standard library ---
24 // --- ROOT system ---
27 // --- AliRoot header files ---
28 #include "AliVZEROConst.h"
31 #include "AliVZEROhit.h"
32 #include "AliRunLoader.h"
33 #include "AliLoader.h"
34 #include "AliRunDigitizer.h"
35 #include "AliCDBManager.h"
36 #include "AliCDBStorage.h"
37 #include "AliCDBEntry.h"
38 #include "AliVZEROCalibData.h"
40 #include "AliVZEROdigit.h"
41 #include "AliVZERODigitizer.h"
43 ClassImp(AliVZERODigitizer)
45 AliVZERODigitizer::AliVZERODigitizer()
47 // default constructor
52 fPhotoCathodeEfficiency = 0.18;
54 fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
56 fCalibData = GetCalibData();
59 //____________________________________________________________________________
60 AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
61 :AliDigitizer(manager)
69 fPhotoCathodeEfficiency = 0.18;
71 fPMGain = TMath::Power( (fPMVoltage / 112.5) ,7.04277 );
73 fCalibData = GetCalibData();
77 //____________________________________________________________________________
78 AliVZERODigitizer::~AliVZERODigitizer()
89 //_____________________________________________________________________________
90 Bool_t AliVZERODigitizer::Init()
92 // Initialises the digitizer
94 // Initialises the Digit array
95 fDigits = new TClonesArray ("AliVZEROdigit", 1000);
100 //____________________________________________________________________________
101 void AliVZERODigitizer::Exec(Option_t* /*option*/)
103 // Creates digits from hits
105 Int_t adc[80]; // 48 values on V0C + 32 on V0A
106 Float_t time[80], adc_gain[80];
108 Float_t cPM = fPhotoCathodeEfficiency * fPMGain;
110 // Retrieval of ADC gain values from local CDB
111 // I use only the first 64th values of the calibration array in CDB
112 // as I have no beam burst structure - odd or even beam burst number
114 // Reminder : We have 16 scintillating cells mounted on 8 PMs
115 // on Ring 3 and Ring 4 in V0C - in principle I should add ADC outputs
116 // on these rings... I do not do it...
118 for(Int_t i=0; i<16; i++) { adc_gain[i] = fCalibData->GetGain(i) ; };
120 for(Int_t j=16; j<48; j=j+2) {
122 adc_gain[j] = fCalibData->GetGain(i) ;
123 adc_gain[j+1] = fCalibData->GetGain(i) ; }
124 for(Int_t i=48; i<80; i++) { adc_gain[i] = fCalibData->GetGain(i-16) ; }
126 // for(Int_t i=0; i<80; i++) { printf(" i = %d gain = %f\n\n", i, adc_gain[i] );}
128 AliRunLoader* outRunLoader =
129 AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
131 Error("Exec", "Can not get output Run Loader");
134 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
136 Error("Exec", "Can not get output VZERO Loader");
139 outLoader->LoadDigits("update");
140 if (!outLoader->TreeD()) outLoader->MakeTree("D");
141 outLoader->MakeDigitsContainer();
142 TTree* treeD = outLoader->TreeD();
143 Int_t bufsize = 16000;
144 treeD->Branch("VZERODigit", &fDigits, bufsize);
146 for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
147 AliRunLoader* runLoader =
148 AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
149 AliLoader* loader = runLoader->GetLoader("VZEROLoader");
151 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
154 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
156 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
158 Error("Exec", "No VZERO detector for input %d", iInput);
162 TTree* treeH = loader->TreeH();
164 Error("Exec", "Cannot get TreeH for input %d", iInput);
167 Float_t timeV0 = 1e12;
168 for(Int_t i=0; i<80; i++) { adc[i] = 0; time[i] = 0.0; }
170 TClonesArray* hits = vzero->Hits();
172 // Now makes Digits from hits
174 Int_t nTracks = (Int_t) treeH->GetEntries();
175 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
177 treeH->GetEvent(iTrack);
178 Int_t nHits = hits->GetEntriesFast();
179 for (Int_t iHit = 0; iHit < nHits; iHit++) {
180 AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
181 Int_t nPhot = hit->Nphot();
182 Int_t cell = hit->Cell();
184 Float_t dt_scintillator = gRandom->Gaus(0,0.3);
185 time[cell] = dt_scintillator + 1e9*hit->Tof();
186 if(time[cell] < timeV0) timeV0 = time[cell];
190 loader->UnloadHits();
194 for (Int_t i=0; i<80; i++) {
195 Float_t q1 = Float_t ( adc[i] )* cPM * kQe;
196 Float_t noise = gRandom->Gaus(10.5,3.22);
197 Float_t pmResponse = q1/kC*TMath::Power(ktheta/kthau,1/(1-ktheta/kthau))
199 adc[i] = Int_t( pmResponse * adc_gain[i]);
201 // printf(" Event, cell, adc, tof = %d %d %d %f\n",
202 // outRunLoader->GetEventNumber(),i, adc[i], time[i]*100.0);
203 // multiply by 10 to have 100 ps per channel :
204 AddDigit(i, adc[i], Int_t(time[i]*10.0) );
210 outLoader->WriteDigits("OVERWRITE");
211 outLoader->UnloadDigits();
215 //____________________________________________________________________________
216 void AliVZERODigitizer::AddDigit(Int_t cellnumber, Int_t adc, Int_t time)
221 TClonesArray &ldigits = *fDigits;
222 new(ldigits[fNdigits++]) AliVZEROdigit(cellnumber,adc,time);
224 //____________________________________________________________________________
225 void AliVZERODigitizer::ResetDigit()
231 if (fDigits) fDigits->Delete();
234 //____________________________________________________________________________
235 AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
238 AliCDBManager *man = AliCDBManager::Instance();
240 AliCDBEntry *entry=0;
242 entry = man->Get("VZERO/Calib/Data");
245 AliWarning("Load of calibration data from default storage failed!");
246 AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
247 Int_t runNumber = man->GetRun();
248 entry = man->GetStorage("local://$ALICE_ROOT")
249 ->Get("VZERO/Calib/Data",runNumber);
253 // Retrieval of data in directory VZERO/Calib/Data:
256 AliVZEROCalibData *calibdata = 0;
258 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
259 if (!calibdata) AliError("No calibration data from calibration database !");