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