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 ---
28 // --- AliRoot header files ---
29 #include "AliVZEROConst.h"
32 #include "AliVZEROhit.h"
33 #include "AliRunLoader.h"
34 #include "AliLoader.h"
35 #include "AliRunDigitizer.h"
36 #include "AliCDBManager.h"
37 #include "AliCDBStorage.h"
38 #include "AliCDBEntry.h"
39 #include "AliVZEROCalibData.h"
41 #include "AliVZEROdigit.h"
42 #include "AliVZERODigitizer.h"
44 ClassImp(AliVZERODigitizer)
46 AliVZERODigitizer::AliVZERODigitizer()
48 // default constructor
53 fPhotoCathodeEfficiency = 0.18;
55 fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
57 fCalibData = GetCalibData();
60 //____________________________________________________________________________
61 AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
62 :AliDigitizer(manager)
70 fPhotoCathodeEfficiency = 0.18;
72 fPMGain = TMath::Power( (fPMVoltage / 112.5) ,7.04277 );
74 fCalibData = GetCalibData();
78 //____________________________________________________________________________
79 AliVZERODigitizer::~AliVZERODigitizer()
90 //_____________________________________________________________________________
91 Bool_t AliVZERODigitizer::Init()
93 // Initialises the digitizer
95 // Initialises the Digit array
96 fDigits = new TClonesArray ("AliVZEROdigit", 1000);
101 //____________________________________________________________________________
102 void AliVZERODigitizer::Exec(Option_t* /*option*/)
104 // Creates digits from hits
106 Int_t map[80]; // 48 values on V0C + 32 on V0A
107 Int_t adc[64]; // 32 PMs on V0C + 32 PMs on V0A
108 Float_t time[80], time2[64], adc_gain[80];
110 Float_t cPM = fPhotoCathodeEfficiency * fPMGain;
112 // Retrieval of ADC gain values from local CDB
113 // I use only the first 64th values of the calibration array in CDB
114 // as I have no beam burst structure - odd or even beam burst number
116 // Reminder : We have 16 scintillating cells mounted on 8 PMs
117 // on Ring 3 and Ring 4 in V0C - added to produce ADC outputs
120 for(Int_t i=0; i<16; i++) { adc_gain[i] = fCalibData->GetGain(i) ; };
122 for(Int_t j=16; j<48; j=j+2) {
124 adc_gain[j] = fCalibData->GetGain(i) ;
125 adc_gain[j+1] = fCalibData->GetGain(i) ; }
126 for(Int_t i=48; i<80; i++) { adc_gain[i] = fCalibData->GetGain(i-16) ; }
128 // for(Int_t i=0; i<80; i++) { printf(" i = %d gain = %f\n\n", i, adc_gain[i] );}
130 AliRunLoader* outRunLoader =
131 AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
133 Error("Exec", "Can not get output Run Loader");
136 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
138 Error("Exec", "Can not get output VZERO Loader");
141 outLoader->LoadDigits("update");
142 if (!outLoader->TreeD()) outLoader->MakeTree("D");
143 outLoader->MakeDigitsContainer();
144 TTree* treeD = outLoader->TreeD();
145 Int_t bufsize = 16000;
146 treeD->Branch("VZERODigit", &fDigits, bufsize);
148 for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
149 AliRunLoader* runLoader =
150 AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
151 AliLoader* loader = runLoader->GetLoader("VZEROLoader");
153 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
156 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
158 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
160 Error("Exec", "No VZERO detector for input %d", iInput);
164 TTree* treeH = loader->TreeH();
166 Error("Exec", "Cannot get TreeH for input %d", iInput);
169 Float_t timeV0 = 1e12;
170 for(Int_t i=0; i<80; i++) { map[i] = 0; time[i] = 0.0; }
172 TClonesArray* hits = vzero->Hits();
174 // Now makes Digits from hits
176 Int_t nTracks = (Int_t) treeH->GetEntries();
177 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
179 treeH->GetEvent(iTrack);
180 Int_t nHits = hits->GetEntriesFast();
181 for (Int_t iHit = 0; iHit < nHits; iHit++) {
182 AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
183 Int_t nPhot = hit->Nphot();
184 Int_t cell = hit->Cell();
186 Float_t dt_scintillator = gRandom->Gaus(0,0.7);
187 time[cell] = dt_scintillator + 1e9*hit->Tof();
188 if(time[cell] < timeV0) timeV0 = time[cell];
192 loader->UnloadHits();
196 // Now builds the scintillator cell response (80 cells i.e. 80 responses)
198 for (Int_t i=0; i<80; i++) {
199 Float_t q1 = Float_t ( map[i] )* cPM * kQe;
200 Float_t noise = gRandom->Gaus(10.5,3.22);
201 Float_t pmResponse = q1/kC*TMath::Power(ktheta/kthau,1/(1-ktheta/kthau))
203 map[i] = Int_t( pmResponse * adc_gain[i]);
207 // Now transforms 80 cell responses into 64 photomultiplier responses
209 for (Int_t j=0; j<32; j++){
213 for (Int_t j=48; j<80; j++){
215 time2[j-16]= time[j];}
217 for (Int_t j=0; j<16; j++){
218 adc[16+j] = map [16 + 2*j]+ map [16 + 2*j + 1];
219 time2[16+j] = TMath::Min(time [16 + 2*j], time [16 + 2*j + 1]);}
221 // Now add digits to the digit Tree
223 for (Int_t i=0; i<64; i++) {
225 // printf(" Event, cell, adc, tof = %d %d %d %f\n",
226 // outRunLoader->GetEventNumber(),i, map[i], time[i]*100.0);
227 // multiply by 10 to have 100 ps per channel :
228 AddDigit(i, adc[i], Int_t(time2[i]*10.0) );
234 outLoader->WriteDigits("OVERWRITE");
235 outLoader->UnloadDigits();
239 //____________________________________________________________________________
240 void AliVZERODigitizer::AddDigit(Int_t PMnumber, Int_t adc, Int_t time)
245 TClonesArray &ldigits = *fDigits;
246 new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time);
248 //____________________________________________________________________________
249 void AliVZERODigitizer::ResetDigit()
255 if (fDigits) fDigits->Delete();
258 //____________________________________________________________________________
259 AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
262 AliCDBManager *man = AliCDBManager::Instance();
264 AliCDBEntry *entry=0;
266 entry = man->Get("VZERO/Calib/Data");
269 AliWarning("Load of calibration data from default storage failed!");
270 AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
271 Int_t runNumber = man->GetRun();
272 entry = man->GetStorage("local://$ALICE_ROOT")
273 ->Get("VZERO/Calib/Data",runNumber);
277 // Retrieval of data in directory VZERO/Calib/Data:
280 AliVZEROCalibData *calibdata = 0;
282 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
283 if (!calibdata) AliError("No calibration data from calibration database !");