AD/AliADDigitizer.cxx

   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
  16 /* $Id: AliADDigitizer.cxx  $ */
  17
  18 ///_________________________________________________________________________
  19 ///
  20 /// This class constructs Digits out of Hits
  21 ///
  22 ///
  23
  24 // --- Standard library ---
  25
  26 // --- ROOT system ---
  27 #include <TMath.h>
  28 #include <TTree.h>
  29 #include <TMap.h>
  30 #include <TGeoManager.h>
  31 #include <TGeoPhysicalNode.h>
  32 #include <AliGeomManager.h>
  33 #include <TRandom.h>
  34 #include <TF1.h>
  35 #include <TH1F.h>
  36
  37 // --- AliRoot header files ---
  38 #include "AliRun.h"
  39 #include "AliDetector.h"
  40 #include "AliAD.h"
  41 #include "AliADhit.h"
  42 #include "AliADConst.h"
  43 #include "AliRunLoader.h"
  44 #include "AliLoader.h"
  45 #include "AliGRPObject.h"
  46 #include "AliDigitizationInput.h"
  47 #include "AliCDBManager.h"
  48 #include "AliCDBStorage.h"
  49 #include "AliCDBEntry.h"
  50 #include "AliADCalibData.h"
  51 #include "AliCTPTimeParams.h"
  52 #include "AliLHCClockPhase.h"
  53 #include "AliADdigit.h"
  54 #include "AliADDigitizer.h"
  55 #include "AliADSDigit.h"
  56
  57 ClassImp(AliADDigitizer)
  58
  59 //____________________________________________________________________________
  60  AliADDigitizer::AliADDigitizer()
  61                    :AliDigitizer(),
  62                     fCalibData(GetCalibData()),
  63                     fNdigits(0),
  64                     fDigits(0),
  65                     fSignalShape(NULL),
  66                     fPMResponse(NULL),
  67                     fSinglePhESpectrum(NULL),
  68                     fEvenOrOdd(kFALSE),
  69                     fTask(kHits2Digits),
  70                     fAD(NULL)
  71 {
  72   // default constructor
  73   // Initialize OCDB and containers used in the digitization
  74
  75   Init();
  76 }
  77
  78 //____________________________________________________________________________
  79   AliADDigitizer::AliADDigitizer(AliAD *AD, DigiTask_t task)
  80                     :AliDigitizer(),
  81                      fCalibData(GetCalibData()),
  82                      fNdigits(0),
  83                      fDigits(0),
  84                      fSignalShape(NULL),
  85                      fPMResponse(NULL),
  86                      fSinglePhESpectrum(NULL),
  87                      fEvenOrOdd(kFALSE),
  88                      fTask(task),
  89                      fAD(AD)
  90 {
  91   // constructor
  92   // Initialize OCDB and containers used in the digitization
  93
  94   Init();
  95 }
  96
  97 //____________________________________________________________________________
  98   AliADDigitizer::AliADDigitizer(AliDigitizationInput* digInput)
  99                     :AliDigitizer(digInput),
 100                      fCalibData(GetCalibData()),
 101                      fNdigits(0),
 102                      fDigits(0),
 103                      fSignalShape(NULL),
 104                      fPMResponse(NULL),
 105                      fSinglePhESpectrum(NULL),
 106                      fEvenOrOdd(kFALSE),
 107                      fTask(kHits2Digits),
 108                      fAD(NULL)
 109 {
 110   // constructor
 111   // Initialize OCDB and containers used in the digitization
 112
 113   Init();
 114 }
 115
 116 //____________________________________________________________________________
 117   AliADDigitizer::~AliADDigitizer()
 118 {
 119   // destructor
 120
 121   if (fDigits) {
 122     fDigits->Delete();
 123     delete fDigits;
 124     fDigits=0;
 125   }
 126
 127   if (fSignalShape) {
 128     delete fSignalShape;
 129     fSignalShape = NULL;
 130   }
 131   if (fPMResponse) {
 132     delete fPMResponse;
 133     fPMResponse = NULL;
 134   }
 135   if (fSinglePhESpectrum) {
 136     delete fSinglePhESpectrum;
 137     fSinglePhESpectrum = NULL;
 138   }
 139
 140   for(Int_t i = 0 ; i < 16; ++i) {
 141     if (fTime[i]) delete [] fTime[i];
 142   }
 143 }
 144
 145 //____________________________________________________________________________
 146 Bool_t AliADDigitizer::Init()
 147 {
 148   // Initialises the digitizer
 149   // Initialize OCDB and containers used in the digitization
 150
 151   // check if the digitizer was already initialized
 152   if (fSignalShape) return kTRUE;
 153
 154   fSignalShape = new TF1("ADSignalShape",this,&AliADDigitizer::SignalShape,0,200,6,"AliADDigitizer","SignalShape");
 155   //  fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
 156   //  fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
 157   //                          3.68911e+00,1.01040e+00, 3.94675e-01);
 158   fSignalShape->SetParameters(-1.07335e+00,2.16002e+01,-1.26133e-01,
 159                               1.41619e+00,5.50334e-01,3.86111e-01);
 160   fPMResponse = new TF1("ADPMResponse",this,&AliADDigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliADDigitizer","PMResponse");
 161   fSinglePhESpectrum = new TF1("ADSinglePhESpectrum",this,&AliADDigitizer::SinglePhESpectrum,0,20,0,"AliADDigitizer","SinglePhESpectrum");
 162
 163   // Now get the CTP L0->L1 delay
 164   AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
 165   if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
 166   AliCTPTimeParams *ctpParams = (AliCTPTimeParams*)entry->GetObject();
 167   Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;
 168
 169   AliCDBEntry *entry1 = AliCDBManager::Instance()->Get("GRP/CTP/TimeAlign");
 170   if (!entry1) AliFatal("CTP time-alignment is not found in OCDB !");
 171   AliCTPTimeParams *ctpTimeAlign = (AliCTPTimeParams*)entry1->GetObject();
 172   l1Delay += ((Float_t)ctpTimeAlign->GetDelayL1L0()*25.0);
 173
 174   AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
 175   if (!entry2) AliFatal("AD time delays are not found in OCDB !");
 176   TH1F *delays = (TH1F*)entry2->GetObject();
 177
 178   AliCDBEntry *entry3 = AliCDBManager::Instance()->Get("GRP/Calib/LHCClockPhase");
 179   if (!entry3) AliFatal("LHC clock-phase shift is not found in OCDB !");
 180   AliLHCClockPhase *phase = (AliLHCClockPhase*)entry3->GetObject();
 181
 182   for(Int_t i = 0 ; i < 16; ++i) {
 183
 184     for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
 185     fLeadingTime[i] = fTimeWidth[i] = 0;
 186
 187     fPmGain[i] = fCalibData->GetGain(i);
 188
 189     fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
 190     fAdcSigma[i][0]    = fCalibData->GetSigma(i);
 191     fAdcPedestal[i][1] = fCalibData->GetPedestal(i+16);
 192     fAdcSigma[i][1]    = fCalibData->GetSigma(i+16);
 193
 194     Int_t board = AliADCalibData::GetBoardNumber(i);
 195     fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
 196                              (Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
 197                             fCalibData->GetTimeResolution(board));
 198     fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
 199                               fCalibData->GetTimeResolution(board));
 200     fBinSize[i] = fCalibData->GetTimeResolution(board);
 201     fHptdcOffset[i] = (((Float_t)fCalibData->GetRollOver(board)-
 202                         (Float_t)fCalibData->GetTriggerCountOffset(board))*25.0+
 203                        fCalibData->GetTimeOffset(i)-
 204                        l1Delay-
 205                        phase->GetMeanPhase()+
 206                        delays->GetBinContent(i+1)+
 207                        kV0Offset);
 208     fClockOffset[i] = (((Float_t)fCalibData->GetRollOver(board)-
 209                         (Float_t)fCalibData->GetTriggerCountOffset(board))*25.0+
 210                        fCalibData->GetTimeOffset(i)-
 211                        l1Delay+
 212                        kV0Offset);
 213
 214     fTime[i] = new Float_t[fNBins[i]];
 215     memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
 216
 217    // AliWarning(Form("PMT %d,PM gain %f, fNBins %d, TimeBinSize %f,",i, fPmGain[i], fNBins[i],fBinSize[i]));
 218
 219   }
 220
 221   return kTRUE;
 222
 223 }
 224
 225 //____________________________________________________________________________
 226 void AliADDigitizer::Digitize(Option_t* /*option*/)
 227 {
 228    // Creates digits from hits
 229   fNdigits = 0;
 230
 231   if (fAD && !fDigInput) {
 232     AliLoader *loader = fAD->GetLoader();
 233     if (!loader) {
 234       AliError("Can not get AD Loader via AliAD object!");
 235       return;
 236     }
 237     AliRunLoader* runLoader = AliRunLoader::Instance();
 238     for (Int_t iEvent = 0; iEvent < runLoader->GetNumberOfEvents(); ++iEvent) {
 239       runLoader->GetEvent(iEvent);
 240       if (fTask == kHits2Digits) {
 241         DigitizeHits();
 242         DigitizeSDigits();
 243         WriteDigits(loader);
 244       }
 245       else {
 246         DigitizeHits();
 247         WriteSDigits(loader);
 248       }
 249     }
 250   }
 251   else if (fDigInput) {
 252       ReadSDigits();
 253       DigitizeSDigits();
 254       AliRunLoader *currentLoader = AliRunLoader::GetRunLoader(fDigInput->GetOutputFolderName());
 255       AliLoader *loader = currentLoader->GetLoader("ADLoader");
 256       if (!loader) {
 257         AliError("Cannot get AD Loader via RunDigitizer!");
 258         return;
 259       }
 260       WriteDigits(loader);
 261   }
 262   else {
 263     AliFatal("Invalid digitization task! Exiting!");
 264   }
 265 }
 266
 267 //____________________________________________________________________________
 268 void AliADDigitizer::DigitizeHits()
 269 {
 270   // Digitize the hits to the level of
 271   // SDigits (fTime arrays)
 272
 273   for(Int_t i = 0 ; i < 16; ++i) {
 274     memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
 275     fLabels[i][0] = fLabels[i][1] = fLabels[i][2] = -1;
 276   }
 277   Float_t integral = fPMResponse->Integral(-kPMRespTime,2.*kPMRespTime);
 278   Float_t meansPhE = fSinglePhESpectrum->Mean(0,20);
 279
 280      AliLoader* loader = fAD->GetLoader();
 281      if (!loader) {
 282        AliError("Can not get AD Loader!");
 283        return;
 284      }
 285      loader->LoadHits();
 286      TTree* treeH = loader->TreeH();
 287      if (!treeH) {
 288        AliError("Cannot get TreeH!");
 289        return;
 290      }
 291      TClonesArray* hits = fAD->Hits();
 292
 293 //  Now makes Digits from hits
 294      Int_t nTracks = (Int_t) treeH->GetEntries();
 295      for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
 296          fAD->ResetHits();
 297          treeH->GetEvent(iTrack);
 298          Int_t nHits = hits->GetEntriesFast();
 299          for (Int_t iHit = 0; iHit < nHits; iHit++) {
 300            AliADhit* hit = (AliADhit *)hits->UncheckedAt(iHit);
 301            Int_t nPhot = hit->GetNphot();
 302            Int_t pmt  = hit->GetCell();//One PM per cell in AD
 303            if (pmt < 0) continue;
 304            Int_t trackLabel = hit->GetTrack();
 305            for(Int_t l = 0; l < 3; ++l) {
 306              if (fLabels[pmt][l] < 0) {
 307                fLabels[pmt][l] = trackLabel;
 308                break;
 309              }
 310            }
 311            Float_t dt_scintillator = gRandom->Gaus(0,kIntTimeRes);
 312            Float_t t = dt_scintillator + hit->GetTof();
 313            //if (pmt < 32) t += kV0CDelayCables;
 314            t += fHptdcOffset[pmt];
 315            Int_t nPhE;
 316            Float_t prob = fCalibData->GetLightYields(pmt)*kPhotoCathodeEfficiency; // Optical losses included!
 317            if (nPhot > 100)
 318              nPhE = (Int_t)gRandom->Gaus(prob*Float_t(nPhot)+0.5,
 319                                          sqrt(Float_t(nPhot)*prob*(1.-prob)));
 320            else
 321              nPhE = gRandom->Binomial(nPhot,prob);
 322            Float_t charge = TMath::Qe()*fPmGain[pmt]*fBinSize[pmt]/integral;
 323
 324
 325            for (Int_t iPhE = 0; iPhE < nPhE; ++iPhE) {
 326              Float_t tPhE = t + fSignalShape->GetRandom(0,fBinSize[pmt]*Float_t(fNBins[pmt]));
 327              Float_t gainVar = fSinglePhESpectrum->GetRandom(0,20)/meansPhE;
 328              Int_t firstBin = TMath::Max(0,(Int_t)((tPhE-kPMRespTime)/fBinSize[pmt]));
 329              Int_t lastBin = TMath::Min(fNBins[pmt]-1,(Int_t)((tPhE+2.*kPMRespTime)/fBinSize[pmt]));
 330              for(Int_t iBin = firstBin; iBin <= lastBin; ++iBin) {
 331                Float_t tempT = fBinSize[pmt]*(0.5+iBin)-tPhE;
 332                fTime[pmt][iBin] += gainVar*charge*fPMResponse->Eval(tempT);
 333              }
 334            }         // ph.e. loop
 335          }           // hit loop
 336      }               // track loop
 337      loader->UnloadHits();
 338 }
 339
 340 //____________________________________________________________________________
 341 void AliADDigitizer::DigitizeSDigits()
 342 {
 343   // Digitize the fTime arrays (SDigits) to the level of
 344   // Digits (fAdc arrays)
 345   for(Int_t i = 0 ; i < 16; ++i) {
 346     for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
 347     fLeadingTime[i] = fTimeWidth[i] = 0;
 348   }
 349
 350   Float_t maximum = 0.9*fSignalShape->GetMaximum(0,200); // Not exact, one needs to do this on the convoluted
 351   Float_t integral2 = fSignalShape->Integral(0,200); // function. Anyway the effect is small <10% on the 2.5 ADC thr
 352   for (Int_t ipmt = 0; ipmt < 16; ++ipmt) {
 353     Float_t thr = fCalibData->GetCalibDiscriThr(ipmt,kFALSE)*kChargePerADC*maximum*fBinSize[ipmt]/integral2;
 354     //Float_t thr = 1e-25;
 355
 356     Bool_t ltFound = kFALSE, ttFound = kFALSE;
 357     for (Int_t iBin = 0; iBin < fNBins[ipmt]; ++iBin) {
 358       Float_t t = fBinSize[ipmt]*Float_t(iBin);
 359
 360       if (fTime[ipmt][iBin] > thr) {
 361         if (!ltFound && (iBin < fNBinsLT[ipmt])) {
 362           ltFound = kTRUE;
 363           fLeadingTime[ipmt] = t;
 364         }
 365       }
 366       else {
 367         if (ltFound) {
 368           if (!ttFound) {
 369             ttFound = kTRUE;
 370             fTimeWidth[ipmt] = t - fLeadingTime[ipmt];
 371           }
 372         }
 373       }
 374       Float_t tadc = t - fClockOffset[ipmt];
 375       Int_t clock = kNClocks/2 - Int_t(tadc/25.0);
 376       if (clock >= 0 && clock < kNClocks)
 377         fAdc[ipmt][clock] += fTime[ipmt][iBin]/kChargePerADC;
 378     }
 379     AliDebug(1,Form("Channel %d Offset %f Time %f",ipmt,fClockOffset[ipmt],fLeadingTime[ipmt]));
 380     Int_t board = AliADCalibData::GetBoardNumber(ipmt);
 381     if (ltFound && ttFound) {
 382       fTimeWidth[ipmt] = fCalibData->GetWidthResolution(board)*
 383         Float_t(Int_t(fTimeWidth[ipmt]/fCalibData->GetWidthResolution(board)));
 384       if (fTimeWidth[ipmt] < Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board))
 385         fTimeWidth[ipmt] = Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board);
 386       if (fTimeWidth[ipmt] > Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board))
 387         fTimeWidth[ipmt] = Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board);
 388     }
 389   }
 390
 391   fEvenOrOdd = gRandom->Integer(2);
 392   for (Int_t j=0; j<16; ++j){
 393     for (Int_t iClock = 0; iClock < kNClocks; ++iClock) {
 394       Int_t integrator = (iClock + fEvenOrOdd) % 2;
 395       AliDebug(1,Form("ADC %d %d %f",j,iClock,fAdc[j][iClock]));
 396       fAdc[j][iClock]  += gRandom->Gaus(fAdcPedestal[j][integrator], fAdcSigma[j][integrator]);
 397     }
 398   }
 399
 400 }
 401
 402 //____________________________________________________________________________
 403 void AliADDigitizer::ReadSDigits()
 404 {
 405   // Read SDigits which are then to precessed
 406   // in the following method
 407   for(Int_t i = 0 ; i < 16; ++i) {
 408     memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
 409     fLabels[i][0] = fLabels[i][1] = fLabels[i][2] = -1;
 410   }
 411
 412   // Loop over input files
 413   Int_t nFiles= fDigInput->GetNinputs();
 414   for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
 415     // Get the current loader
 416     AliRunLoader* currentLoader =
 417       AliRunLoader::GetRunLoader(fDigInput->GetInputFolderName(inputFile));
 418
 419     AliLoader *loader = currentLoader->GetLoader("ADLoader");
 420     loader->LoadSDigits("READ");
 421
 422     // Get the tree of summable digits
 423     TTree* sdigitsTree = loader->TreeS();
 424     if (!sdigitsTree)  {
 425       AliError("No sdigit tree from digInput");
 426       continue;
 427     }
 428
 429     // Get the branch
 430     TBranch* sdigitsBranch = sdigitsTree->GetBranch("ADSDigit");
 431     if (!sdigitsBranch) {
 432       AliError("Failed to get sdigit branch");
 433       return;
 434     }
 435
 436     // Set the branch address
 437     TClonesArray *sdigitsArray = NULL;
 438     sdigitsBranch->SetAddress(&sdigitsArray);
 439
 440     // Sum contributions from the sdigits
 441     // Get number of entries in the tree
 442     Int_t nentries  = Int_t(sdigitsBranch->GetEntries());
 443     for (Int_t entry = 0; entry < nentries; ++entry)  {
 444       sdigitsBranch->GetEntry(entry);
 445       // Get the number of sdigits
 446       Int_t nsdigits = sdigitsArray->GetEntries();
 447
 448       for (Int_t sdigit = 0; sdigit < nsdigits; sdigit++) {
 449         AliADSDigit* sDigit = static_cast<AliADSDigit*>(sdigitsArray->UncheckedAt(sdigit));
 450         Int_t pmNumber = sDigit->PMNumber();
 451         Int_t nbins = sDigit->GetNBins();
 452         if (nbins != fNBins[pmNumber]) {
 453           AliError(Form("Incompatible number of bins between digitizer (%d) and sdigit (%d) for PM %d! Skipping sdigit!",
 454                         fNBins[pmNumber],nbins,pmNumber));
 455           continue;
 456         }
 457         // Sum the charges
 458         Float_t *charges = sDigit->GetCharges();
 459         for(Int_t iBin = 0; iBin < nbins; ++iBin) fTime[pmNumber][iBin] += charges[iBin];
 460         // and the labels
 461         Int_t *labels = sDigit->GetTracks();
 462         Int_t j = 0;
 463         for(Int_t i = 0; i < 3; ++i) {
 464           if (fLabels[pmNumber][i] < 0) {
 465             if (labels[j] < 0) break;
 466             fLabels[pmNumber][i] = labels[j];
 467             j++;
 468           }
 469         }
 470       }
 471     }
 472     loader->UnloadSDigits();
 473   }
 474 }
 475
 476
 477 //____________________________________________________________________________
 478 void AliADDigitizer::WriteDigits(AliLoader *loader)
 479 {
 480   // Take fAdc arrays filled by the previous
 481   // method and produce and add digits to the digit Tree
 482
 483   loader->LoadDigits("UPDATE");
 484
 485   if (!loader->TreeD()) loader->MakeTree("D");
 486   loader->MakeDigitsContainer();
 487   TTree* treeD  = loader->TreeD();
 488   DigitsArray();
 489   treeD->Branch("ADDigit", &fDigits);
 490   //fAD->MakeBranchInTree(treeD,"AD",&fDigits,1000,"");
 491
 492   Short_t *chargeADC = new Short_t[kNClocks];
 493   for (Int_t i=0; i<16; i++) {
 494     for (Int_t j = 0; j < kNClocks; ++j) {
 495       Int_t tempadc = Int_t(fAdc[i][j]);
 496       if (tempadc > 1023) tempadc = 1023;
 497       chargeADC[j] = tempadc;
 498     }
 499     AddDigit(i, fLeadingTime[i], fTimeWidth[i], Bool_t((10+fEvenOrOdd)%2), chargeADC, fLabels[i]);
 500   }
 501   delete [] chargeADC;
 502
 503   treeD->Fill();
 504   loader->WriteDigits("OVERWRITE");
 505   loader->UnloadDigits();
 506   ResetDigits();
 507 }
 508
 509 //____________________________________________________________________________
 510 void AliADDigitizer::WriteSDigits(AliLoader *loader)
 511 {
 512   // Take fTime arrays filled by the previous
 513   // method and produce and add sdigits to the sdigit Tree
 514
 515   loader->LoadSDigits("UPDATE");
 516
 517   if (!loader->TreeS()) loader->MakeTree("S");
 518   loader->MakeSDigitsContainer();
 519   TTree* treeS  = loader->TreeS();
 520   SDigitsArray();
 521   treeS->Branch("ADSDigit", &fDigits);
 522   //fAD->MakeBranchInTree(treeS,"AD",&fDigits,8000,"");
 523
 524   for (Int_t ipmt = 0; ipmt < 16; ++ipmt) {
 525     AddSDigit(ipmt,fNBins[ipmt],fTime[ipmt],fLabels[ipmt]);
 526   }
 527
 528   treeS->Fill();
 529   loader->WriteSDigits("OVERWRITE");
 530   loader->UnloadSDigits();
 531   ResetDigits();
 532 }
 533
 534
 535
 536 //____________________________________________________________________________
 537 void AliADDigitizer::AddDigit(Int_t pmnumber, Float_t time, Float_t width, Bool_t integrator, Short_t *chargeADC, Int_t *labels)
 538  {
 539
 540 // Adds Digit
 541
 542   TClonesArray &ldigits = *fDigits;
 543
 544   new(ldigits[fNdigits++]) AliADdigit(pmnumber,time,width,integrator,chargeADC,labels);
 545
 546 }
 547 //____________________________________________________________________________
 548 void AliADDigitizer::AddSDigit(Int_t pmnumber, Int_t nbins, Float_t *charges, Int_t *labels)
 549  {
 550
 551 // Adds SDigit
 552
 553   TClonesArray &ldigits = *fDigits;
 554
 555   new(ldigits[fNdigits++]) AliADSDigit(pmnumber,nbins,charges,labels);
 556
 557 }
 558 //____________________________________________________________________________
 559 void AliADDigitizer::ResetDigits()
 560 {
 561
 562 // Clears Digits
 563
 564   fNdigits = 0;
 565   if (fDigits) fDigits->Clear();
 566 }
 567
 568 //____________________________________________________________________________
 569 AliADCalibData* AliADDigitizer::GetCalibData() const
 570
 571 {
 572 /*/
 573   AliCDBManager *man = AliCDBManager::Instance();
 574
 575   AliCDBEntry *entry=0;
 576
 577   entry = man->Get("AD/Calib/Data");
 578
 579   AliADCalibData *calibdata = 0;
 580
 581   if (entry) calibdata = (AliADCalibData*) entry->GetObject();
 582   if (!calibdata)  AliFatal("No calibration data from calibration database !");
 583 /*/
 584   AliADCalibData *calibdata = new AliADCalibData();
 585
 586   return calibdata;
 587
 588 }
 589
 590 //____________________________________________________________________________
 591 double AliADDigitizer::SignalShape(double *x, double *par)
 592 {
 593   // this function simulates the time
 594   // of arrival of the photons at the
 595   // photocathode
 596   Double_t xx = x[0];
 597   if (xx <= par[0]) return 0;
 598   Double_t a = 1./TMath::Power((xx-par[0])/par[1],1./par[2]);
 599   if (xx <= par[3]) return a;
 600   Double_t b = 1./TMath::Power((xx-par[3])/par[4],1./par[5]);
 601   Double_t f = a*b/(a+b);
 602   AliDebug(100,Form("x=%f func=%f",xx,f));
 603   return f;
 604 }
 605
 606 //____________________________________________________________________________
 607 double AliADDigitizer::PMResponse(double *x, double * /* par */)
 608 {
 609   // this function describes the
 610   // PM time response to a single
 611   // photoelectron
 612   Double_t xx = x[0]+kPMRespTime;
 613   return xx*xx*TMath::Exp(-xx*xx/(kPMRespTime*kPMRespTime));
 614 }
 615
 616 //____________________________________________________________________________
 617 double AliADDigitizer::SinglePhESpectrum(double *x, double * /* par */)
 618 {
 619   // this function describes the
 620   // PM amplitude response to a single
 621   // photoelectron
 622   Double_t xx = x[0];
 623   if (xx < 0) return 0;
 624   return (TMath::Poisson(xx,kPMNbOfSecElec)+kPMTransparency*TMath::Poisson(xx,1.0));
 625 }
 626 //____________________________________________________________________
 627 TClonesArray* AliADDigitizer::DigitsArray()
 628 {
 629   // Initialize digit array if not already and
 630   // return pointer to it.
 631   if (!fDigits) {
 632     fDigits = new TClonesArray("AliADdigit", 16);
 633     fNdigits = 0;
 634   }
 635   return fDigits;
 636 }
 637
 638 //____________________________________________________________________
 639 TClonesArray* AliADDigitizer::SDigitsArray()
 640 {
 641   // Initialize sdigit array if not already and
 642   // return pointer to it.
 643   if (!fDigits) {
 644     fDigits = new TClonesArray("AliADSDigit", 16);
 645     fNdigits = 0;
 646   }
 647   return fDigits;
 648 }
 649