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 **************************************************************************/
18 ///_________________________________________________________________________
20 /// This class constructs Digits out of Hits
24 // --- Standard library ---
26 // --- ROOT system ---
29 #include <TGeoManager.h>
30 #include <TGeoPhysicalNode.h>
31 #include <AliGeomManager.h>
34 // --- AliRoot header files ---
35 #include "AliVZEROConst.h"
38 #include "AliVZEROhit.h"
39 #include "AliRunLoader.h"
40 #include "AliLoader.h"
41 #include "AliRunDigitizer.h"
42 #include "AliCDBManager.h"
43 #include "AliCDBStorage.h"
44 #include "AliCDBEntry.h"
45 #include "AliVZEROCalibData.h"
47 #include "AliVZEROdigit.h"
48 #include "AliVZERODigitizer.h"
50 ClassImp(AliVZERODigitizer)
52 AliVZERODigitizer::AliVZERODigitizer()
54 fCalibData(GetCalibData()),
55 fPhotoCathodeEfficiency(0.18),
57 fPMGain(TMath::Power((fPMVoltage / 112.5) ,7.04277)),
62 // default constructor
67 // fPhotoCathodeEfficiency = 0.18;
68 // fPMVoltage = 768.0;
69 // fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
71 // fCalibData = GetCalibData();
74 //____________________________________________________________________________
75 AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
76 :AliDigitizer(manager),
77 fCalibData(GetCalibData()),
78 fPhotoCathodeEfficiency(0.18),
80 fPMGain(TMath::Power((fPMVoltage / 112.5) ,7.04277)),
90 // fPhotoCathodeEfficiency = 0.18;
91 // fPMVoltage = 768.0;
92 // fPMGain = TMath::Power( (fPMVoltage / 112.5) ,7.04277 );
94 // fCalibData = GetCalibData();
98 //____________________________________________________________________________
99 AliVZERODigitizer::~AliVZERODigitizer()
110 //_____________________________________________________________________________
111 Bool_t AliVZERODigitizer::Init()
113 // Initialises the digitizer
115 // Initialises the Digit array
116 fDigits = new TClonesArray ("AliVZEROdigit", 1000);
118 // TGeoHMatrix *im = AliGeomManager::GetMatrix("VZERO/V0C");
124 //____________________________________________________________________________
125 void AliVZERODigitizer::Exec(Option_t* /*option*/)
127 // Creates digits from hits
129 Int_t map[80]; // 48 values on V0C + 32 on V0A
130 Int_t adc[64]; // 32 PMs on V0C + 32 PMs on V0A
131 Float_t time[80], time_ref[80], time2[64];
132 Float_t adc_gain[80];
133 Float_t adc_pedestal[64],adc_sigma[64];
135 Float_t PMGain_smeared[64];
138 // Smearing of the PM tubes intrinsic characteristics
140 for(Int_t ii=0; ii<64; ii++) {
141 PMGain_smeared[ii] = gRandom->Gaus(fPMGain, fPMGain/5); }
143 // Retrieval of ADC gain values and pedestal information from local CDB
144 // I use only the first 64th values of the calibration array in CDB
145 // as I have no beam burst structure - odd or even beam burst number
147 // Reminder : We have 16 scintillating cells mounted on 8 PMs
148 // on Ring 3 and Ring 4 in V0C - added to produce ADC outputs
151 for(Int_t i=0; i<16; i++) {
152 adc_gain[i] = fCalibData->GetGain(i);
153 cPM[i] = fPhotoCathodeEfficiency * PMGain_smeared[i];}
155 for(Int_t j=16; j<48; j=j+2) {
157 adc_gain[j] = fCalibData->GetGain(i);
158 adc_gain[j+1] = fCalibData->GetGain(i);
159 cPM[j] = fPhotoCathodeEfficiency * PMGain_smeared[i];
160 cPM[j+1] = fPhotoCathodeEfficiency * PMGain_smeared[i]; }
162 for(Int_t i=48; i<80; i++){
163 adc_gain[i] = fCalibData->GetGain(i-16);
164 cPM[i] = fPhotoCathodeEfficiency * PMGain_smeared[i-16];};
166 for(Int_t i=0; i<64; i++){ adc_pedestal[i] = fCalibData->GetPedestal(i);
167 adc_sigma[i] = fCalibData->GetSigma(i); };
169 // for(Int_t i=0; i<64; i++) { printf(" i = %d pedestal = %f sigma = %f \n\n",
170 // i, adc_pedestal[i], adc_sigma[i] );}
172 AliRunLoader* outRunLoader =
173 AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
175 Error("Exec", "Can not get output Run Loader");
178 AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
180 Error("Exec", "Can not get output VZERO Loader");
183 outLoader->LoadDigits("update");
184 if (!outLoader->TreeD()) outLoader->MakeTree("D");
185 outLoader->MakeDigitsContainer();
186 TTree* treeD = outLoader->TreeD();
187 Int_t bufsize = 16000;
188 treeD->Branch("VZERODigit", &fDigits, bufsize);
190 for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
191 AliRunLoader* runLoader =
192 AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
193 AliLoader* loader = runLoader->GetLoader("VZEROLoader");
195 Error("Exec", "Can not get VZERO Loader for input %d", iInput);
198 if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
200 AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
202 Error("Exec", "No VZERO detector for input %d", iInput);
206 TTree* treeH = loader->TreeH();
208 Error("Exec", "Cannot get TreeH for input %d", iInput);
211 for(Int_t i=0; i<80; i++) {map[i] = 0; time[i] = 0.0;}
213 TClonesArray* hits = vzero->Hits();
215 // Now makes Digits from hits
217 Int_t nTracks = (Int_t) treeH->GetEntries();
218 for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
219 for (Int_t i=0; i<80; i++) {time_ref[i] = 999999.0;}
221 treeH->GetEvent(iTrack);
222 Int_t nHits = hits->GetEntriesFast();
223 for (Int_t iHit = 0; iHit < nHits; iHit++) {
224 AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
225 Int_t nPhot = hit->Nphot();
226 Int_t cell = hit->Cell();
228 Float_t dt_scintillator = gRandom->Gaus(0,0.7);
229 Float_t t = dt_scintillator + 1e9*hit->Tof();
231 if(t < time_ref[cell]) time_ref[cell] = t;
232 time[cell] = TMath::Min(t,time_ref[cell]); }
236 loader->UnloadHits();
240 // Now builds the scintillator cell response (80 cells i.e. 80 responses)
242 for (Int_t i=0; i<80; i++) {
243 Float_t q1 = Float_t ( map[i] )* cPM[i] * kQe;
244 Float_t noise = gRandom->Gaus(10.5,3.22);
245 Float_t pmResponse = q1/kC*TMath::Power(ktheta/kthau,1/(1-ktheta/kthau))
247 map[i] = Int_t( pmResponse * adc_gain[i]);
248 if(map[i] > (110/2)) {map[i] = Int_t(gRandom->Gaus(map[i], 110/6));}
251 // Now transforms 80 cell responses into 64 photomultiplier responses
252 // Also adds the ADC pedestals taken out of the calibration data base
254 for (Int_t j=0; j<16; j++){
255 adc[j] = static_cast<Int_t>(map [j] + gRandom->Gaus(adc_pedestal[j], adc_sigma[j]));
258 for (Int_t j=48; j<80; j++){
259 adc[j-16] = static_cast<Int_t>(map [j]
260 + gRandom->Gaus(adc_pedestal[j-16],adc_sigma[j-16]));
261 time2[j-16]= time[j]; }
263 for (Int_t j=0; j<16; j++){
264 adc[16+j] = static_cast<Int_t>(map [16+2*j]+ map [16+2*j+1]
265 + gRandom->Gaus(adc_pedestal[16+j], adc_sigma[16+j]));
266 Float_t min_time = TMath::Min(time [16+2*j],time [16+2*j+1]);
267 time2[16+j] = min_time;
268 if(min_time==0.0){time2[16+j]=TMath::Max(time[16+2*j],time[16+2*j+1]);}
272 // Now add digits to the digit Tree
274 for (Int_t i=0; i<64; i++) {
276 // printf(" Event, cell, adc, tof = %d %d %d %f\n",
277 // outRunLoader->GetEventNumber(),i, map[i], time2[i]*10.0);
278 // multiply by 10 to have 100 ps per channel :
279 AddDigit(i, adc[i], Int_t(time2[i]*10.0)) ;}
283 outLoader->WriteDigits("OVERWRITE");
284 outLoader->UnloadDigits();
288 //____________________________________________________________________________
289 void AliVZERODigitizer::AddDigit(Int_t PMnumber, Int_t adc, Int_t time)
294 TClonesArray &ldigits = *fDigits;
295 new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time);
297 //____________________________________________________________________________
298 void AliVZERODigitizer::ResetDigit()
304 if (fDigits) fDigits->Delete();
307 //____________________________________________________________________________
308 AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
311 AliCDBManager *man = AliCDBManager::Instance();
313 AliCDBEntry *entry=0;
315 entry = man->Get("VZERO/Calib/Data");
318 // AliWarning("Load of calibration data from default storage failed!");
319 // AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
320 // Int_t runNumber = man->GetRun();
321 // entry = man->GetStorage("local://$ALICE_ROOT/OCDB")
322 // ->Get("VZERO/Calib/Data",runNumber);
326 // Retrieval of data in directory VZERO/Calib/Data:
329 AliVZEROCalibData *calibdata = 0;
331 if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
332 if (!calibdata) AliFatal("No calibration data from calibration database !");