Coding conventions + eff C++ corrections
[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
105 Int_t adc[80]; // 48 values on V0C + 32 on V0A
106 Float_t time[80], adc_gain[80];
107 fNdigits = 0;
108 Float_t cPM = fPhotoCathodeEfficiency * fPMGain;
109
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
b0d2c2d3 113
ce7090f5 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...
117
118 for(Int_t i=0; i<16; i++) { adc_gain[i] = fCalibData->GetGain(i) ; };
119
120 for(Int_t j=16; j<48; j=j+2) {
121 Int_t i=(j+17)/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) ; }
125
126// for(Int_t i=0; i<80; i++) { printf(" i = %d gain = %f\n\n", i, adc_gain[i] );}
127
b0d2c2d3 128 AliRunLoader* outRunLoader =
129 AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
130 if (!outRunLoader) {
131 Error("Exec", "Can not get output Run Loader");
ce7090f5 132 return;}
133
b0d2c2d3 134 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
135 if (!outLoader) {
136 Error("Exec", "Can not get output VZERO Loader");
ce7090f5 137 return;}
b0d2c2d3 138
139 outLoader->LoadDigits("update");
140 if (!outLoader->TreeD()) outLoader->MakeTree("D");
141 outLoader->MakeDigitsContainer();
ce7090f5 142 TTree* treeD = outLoader->TreeD();
b0d2c2d3 143 Int_t bufsize = 16000;
144 treeD->Branch("VZERODigit", &fDigits, bufsize);
145
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");
150 if (!loader) {
151 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
ce7090f5 152 continue;}
153
b0d2c2d3 154 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
155
156 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
157 if (!vzero) {
158 Error("Exec", "No VZERO detector for input %d", iInput);
ce7090f5 159 continue;}
9e04c3b6 160
b0d2c2d3 161 loader->LoadHits();
162 TTree* treeH = loader->TreeH();
163 if (!treeH) {
164 Error("Exec", "Cannot get TreeH for input %d", iInput);
ce7090f5 165 continue; }
841137ce 166
167 Float_t timeV0 = 1e12;
ce7090f5 168 for(Int_t i=0; i<80; i++) { adc[i] = 0; time[i] = 0.0; }
841137ce 169
b0d2c2d3 170 TClonesArray* hits = vzero->Hits();
9e04c3b6 171
b0d2c2d3 172// Now makes Digits from hits
9e04c3b6 173
b0d2c2d3 174 Int_t nTracks = (Int_t) treeH->GetEntries();
175 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
176 vzero->ResetHits();
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();
841137ce 183 adc[cell] += nPhot;
c313ff94 184 Float_t dt_scintillator = gRandom->Gaus(0,0.3);
841137ce 185 time[cell] = dt_scintillator + 1e9*hit->Tof();
186 if(time[cell] < timeV0) timeV0 = time[cell];
b0d2c2d3 187 } // hit loop
188 } // track loop
189
190 loader->UnloadHits();
191
192 } // input loop
841137ce 193
ce7090f5 194 for (Int_t i=0; i<80; i++) {
841137ce 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))
b0d2c2d3 198 + noise*1e-3;
ce7090f5 199 adc[i] = Int_t( pmResponse * adc_gain[i]);
841137ce 200 if(adc[i] > 0) {
201// printf(" Event, cell, adc, tof = %d %d %d %f\n",
202// outRunLoader->GetEventNumber(),i, adc[i], time[i]*100.0);
5c1828c2 203// multiply by 10 to have 100 ps per channel :
204 AddDigit(i, adc[i], Int_t(time[i]*10.0) );
b0d2c2d3 205 }
841137ce 206
b0d2c2d3 207 }
208
209 treeD->Fill();
210 outLoader->WriteDigits("OVERWRITE");
211 outLoader->UnloadDigits();
212 ResetDigit();
9e04c3b6 213}
214
215//____________________________________________________________________________
7caec66b 216void AliVZERODigitizer::AddDigit(Int_t cellnumber, Int_t adc, Int_t time)
9e04c3b6 217 {
218
219// Adds Digit
220
221 TClonesArray &ldigits = *fDigits;
7caec66b 222 new(ldigits[fNdigits++]) AliVZEROdigit(cellnumber,adc,time);
9e04c3b6 223}
224//____________________________________________________________________________
225void AliVZERODigitizer::ResetDigit()
226{
b0d2c2d3 227//
9e04c3b6 228// Clears Digits
b0d2c2d3 229//
9e04c3b6 230 fNdigits = 0;
b0d2c2d3 231 if (fDigits) fDigits->Delete();
9e04c3b6 232}
ce7090f5 233
234//____________________________________________________________________________
235AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
236
237{
c0b82b5a 238 AliCDBManager *man = AliCDBManager::Instance();
ce7090f5 239
c0b82b5a 240 AliCDBEntry *entry=0;
ce7090f5 241
c0b82b5a 242 entry = man->Get("VZERO/Calib/Data");
243
244 if(!entry){
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);
250
251 }
252
253 // Retrieval of data in directory VZERO/Calib/Data:
ce7090f5 254
ce7090f5 255
c0b82b5a 256 AliVZEROCalibData *calibdata = 0;
ce7090f5 257
c0b82b5a 258 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
259 if (!calibdata) AliError("No calibration data from calibration database !");
ce7090f5 260
c0b82b5a 261 return calibdata;
ce7090f5 262
263}
264