Cell number replaced by PM number in digit Tree
[u/mrichter/AliRoot.git] / VZERO / AliVZERODigitizer.cxx
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9e04c3b6 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
b0d2c2d3 16///_________________________________________________________________________
17///
18/// This class constructs Digits out of Hits
19///
20///
9e04c3b6 21
22// --- Standard library ---
9e04c3b6 23
24// --- ROOT system ---
9e04c3b6 25#include <TTree.h>
9e04c3b6 26
27// --- AliRoot header files ---
28#include "AliVZEROConst.h"
29#include "AliRun.h"
30#include "AliVZERO.h"
31#include "AliVZEROhit.h"
9e04c3b6 32#include "AliRunLoader.h"
33#include "AliLoader.h"
9e04c3b6 34#include "AliRunDigitizer.h"
ce7090f5 35#include "AliCDBManager.h"
36#include "AliCDBStorage.h"
37#include "AliCDBEntry.h"
38#include "AliVZEROCalibData.h"
39
9e04c3b6 40#include "AliVZEROdigit.h"
b0d2c2d3 41#include "AliVZERODigitizer.h"
9e04c3b6 42
43ClassImp(AliVZERODigitizer)
44
45 AliVZERODigitizer::AliVZERODigitizer()
46{
b0d2c2d3 47 // default constructor
48
9e04c3b6 49 fNdigits = 0;
ce7090f5 50 fDigits = 0;
9e04c3b6 51
52 fPhotoCathodeEfficiency = 0.18;
53 fPMVoltage = 768.0;
ce7090f5 54 fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
55
56 fCalibData = GetCalibData();
9e04c3b6 57}
58
59//____________________________________________________________________________
60 AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
61 :AliDigitizer(manager)
62
63{
64 // constructor
65
9e04c3b6 66 fNdigits = 0;
841137ce 67 fDigits = 0;
9e04c3b6 68
69 fPhotoCathodeEfficiency = 0.18;
70 fPMVoltage = 768.0;
71 fPMGain = TMath::Power( (fPMVoltage / 112.5) ,7.04277 );
ce7090f5 72
73 fCalibData = GetCalibData();
74
9e04c3b6 75}
76
77//____________________________________________________________________________
78 AliVZERODigitizer::~AliVZERODigitizer()
79{
80 // destructor
81
82 if (fDigits) {
83 fDigits->Delete();
84 delete fDigits;
b0d2c2d3 85 fDigits=0;
86 }
9e04c3b6 87}
88
b0d2c2d3 89//_____________________________________________________________________________
90Bool_t AliVZERODigitizer::Init()
9e04c3b6 91{
b0d2c2d3 92 // Initialises the digitizer
9e04c3b6 93
b0d2c2d3 94 // Initialises the Digit array
9e04c3b6 95 fDigits = new TClonesArray ("AliVZEROdigit", 1000);
96
b0d2c2d3 97 return kTRUE;
9e04c3b6 98}
99
100//____________________________________________________________________________
b0d2c2d3 101void AliVZERODigitizer::Exec(Option_t* /*option*/)
ce7090f5 102{
b0d2c2d3 103 // Creates digits from hits
ce7090f5 104
20277079 105 Int_t map[80]; // 48 values on V0C + 32 on V0A
106 Int_t adc[64]; // 32 PMs on V0C + 32 PMs on V0A
107 Float_t time[80], time2[64], adc_gain[80];
ce7090f5 108 fNdigits = 0;
109 Float_t cPM = fPhotoCathodeEfficiency * fPMGain;
110
111 // Retrieval of ADC gain values from local CDB
112 // I use only the first 64th values of the calibration array in CDB
113 // as I have no beam burst structure - odd or even beam burst number
b0d2c2d3 114
ce7090f5 115 // Reminder : We have 16 scintillating cells mounted on 8 PMs
20277079 116 // on Ring 3 and Ring 4 in V0C - added to produce ADC outputs
117 // on these rings...
ce7090f5 118
119 for(Int_t i=0; i<16; i++) { adc_gain[i] = fCalibData->GetGain(i) ; };
120
121 for(Int_t j=16; j<48; j=j+2) {
122 Int_t i=(j+17)/2;
123 adc_gain[j] = fCalibData->GetGain(i) ;
124 adc_gain[j+1] = fCalibData->GetGain(i) ; }
125 for(Int_t i=48; i<80; i++) { adc_gain[i] = fCalibData->GetGain(i-16) ; }
126
127// for(Int_t i=0; i<80; i++) { printf(" i = %d gain = %f\n\n", i, adc_gain[i] );}
128
b0d2c2d3 129 AliRunLoader* outRunLoader =
130 AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
131 if (!outRunLoader) {
132 Error("Exec", "Can not get output Run Loader");
ce7090f5 133 return;}
134
b0d2c2d3 135 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
136 if (!outLoader) {
137 Error("Exec", "Can not get output VZERO Loader");
ce7090f5 138 return;}
b0d2c2d3 139
140 outLoader->LoadDigits("update");
141 if (!outLoader->TreeD()) outLoader->MakeTree("D");
142 outLoader->MakeDigitsContainer();
ce7090f5 143 TTree* treeD = outLoader->TreeD();
b0d2c2d3 144 Int_t bufsize = 16000;
145 treeD->Branch("VZERODigit", &fDigits, bufsize);
146
147 for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
148 AliRunLoader* runLoader =
149 AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
150 AliLoader* loader = runLoader->GetLoader("VZEROLoader");
151 if (!loader) {
152 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
ce7090f5 153 continue;}
154
b0d2c2d3 155 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
156
157 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
158 if (!vzero) {
159 Error("Exec", "No VZERO detector for input %d", iInput);
ce7090f5 160 continue;}
9e04c3b6 161
b0d2c2d3 162 loader->LoadHits();
163 TTree* treeH = loader->TreeH();
164 if (!treeH) {
165 Error("Exec", "Cannot get TreeH for input %d", iInput);
ce7090f5 166 continue; }
841137ce 167
168 Float_t timeV0 = 1e12;
20277079 169 for(Int_t i=0; i<80; i++) { map[i] = 0; time[i] = 0.0; }
841137ce 170
b0d2c2d3 171 TClonesArray* hits = vzero->Hits();
9e04c3b6 172
b0d2c2d3 173// Now makes Digits from hits
9e04c3b6 174
b0d2c2d3 175 Int_t nTracks = (Int_t) treeH->GetEntries();
176 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
177 vzero->ResetHits();
178 treeH->GetEvent(iTrack);
179 Int_t nHits = hits->GetEntriesFast();
180 for (Int_t iHit = 0; iHit < nHits; iHit++) {
181 AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
182 Int_t nPhot = hit->Nphot();
183 Int_t cell = hit->Cell();
20277079 184 map[cell] += nPhot;
185 Float_t dt_scintillator = gRandom->Gaus(0,0.7);
841137ce 186 time[cell] = dt_scintillator + 1e9*hit->Tof();
187 if(time[cell] < timeV0) timeV0 = time[cell];
b0d2c2d3 188 } // hit loop
189 } // track loop
190
191 loader->UnloadHits();
192
193 } // input loop
20277079 194
195// Now builds the scintillator cell response (80 cells i.e. 80 responses)
841137ce 196
20277079 197 for (Int_t i=0; i<80; i++) {
198 Float_t q1 = Float_t ( map[i] )* cPM * kQe;
199 Float_t noise = gRandom->Gaus(10.5,3.22);
200 Float_t pmResponse = q1/kC*TMath::Power(ktheta/kthau,1/(1-ktheta/kthau))
201 + noise*1e-3;
202 map[i] = Int_t( pmResponse * adc_gain[i]);
203 }
204
205
206// Now transforms 80 cell responses into 64 photomultiplier responses
207
208 for (Int_t j=0; j<32; j++){
209 adc[j] = map [j];
210 time2[j]= time[j];}
211
212 for (Int_t j=48; j<80; j++){
213 adc[j-16] = map [j];
214 time2[j-16]= time[j];}
215
216 for (Int_t j=0; j<16; j++){
217 adc[16+j] = map [16 + 2*j]+ map [16 + 2*j + 1];
218 time2[16+j] = TMath::Min(time [16 + 2*j], time [16 + 2*j + 1]);}
219
220// Now add digits to the digit Tree
221
222 for (Int_t i=0; i<64; i++) {
223 if(adc[i] > 0) {
224// printf(" Event, cell, adc, tof = %d %d %d %f\n",
225// outRunLoader->GetEventNumber(),i, map[i], time[i]*100.0);
5c1828c2 226// multiply by 10 to have 100 ps per channel :
20277079 227 AddDigit(i, adc[i], Int_t(time2[i]*10.0) );
228 }
229 }
b0d2c2d3 230
20277079 231
b0d2c2d3 232 treeD->Fill();
233 outLoader->WriteDigits("OVERWRITE");
234 outLoader->UnloadDigits();
235 ResetDigit();
9e04c3b6 236}
237
238//____________________________________________________________________________
20277079 239void AliVZERODigitizer::AddDigit(Int_t PMnumber, Int_t adc, Int_t time)
9e04c3b6 240 {
241
242// Adds Digit
243
244 TClonesArray &ldigits = *fDigits;
20277079 245 new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time);
9e04c3b6 246}
247//____________________________________________________________________________
248void AliVZERODigitizer::ResetDigit()
249{
b0d2c2d3 250//
9e04c3b6 251// Clears Digits
b0d2c2d3 252//
9e04c3b6 253 fNdigits = 0;
b0d2c2d3 254 if (fDigits) fDigits->Delete();
9e04c3b6 255}
ce7090f5 256
257//____________________________________________________________________________
258AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
259
260{
c0b82b5a 261 AliCDBManager *man = AliCDBManager::Instance();
ce7090f5 262
c0b82b5a 263 AliCDBEntry *entry=0;
ce7090f5 264
c0b82b5a 265 entry = man->Get("VZERO/Calib/Data");
266
267 if(!entry){
268 AliWarning("Load of calibration data from default storage failed!");
269 AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
270 Int_t runNumber = man->GetRun();
271 entry = man->GetStorage("local://$ALICE_ROOT")
272 ->Get("VZERO/Calib/Data",runNumber);
273
274 }
275
276 // Retrieval of data in directory VZERO/Calib/Data:
ce7090f5 277
ce7090f5 278
c0b82b5a 279 AliVZEROCalibData *calibdata = 0;
ce7090f5 280
c0b82b5a 281 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
282 if (!calibdata) AliError("No calibration data from calibration database !");
ce7090f5 283
c0b82b5a 284 return calibdata;
ce7090f5 285
286}
287