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