[u/mrichter/AliRoot.git] / VZERO / AliVZERODigitizer.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
 
/* $Id$ */

///_________________________________________________________________________
///
/// This class constructs Digits out of Hits
///
///

// --- Standard library ---

// --- ROOT system ---
#include <TMath.h>
#include <TTree.h>
#include <TMap.h>
#include <TGeoManager.h>
#include <TGeoPhysicalNode.h>
#include <AliGeomManager.h>
#include <TRandom.h>
#include <TF1.h>
#include <TH1F.h>

// --- AliRoot header files ---
#include "AliRun.h"
#include "AliVZERO.h"
#include "AliVZEROhit.h"
#include "AliRunLoader.h"
#include "AliLoader.h"
#include "AliGRPObject.h"
#include "AliRunDigitizer.h"
#include "AliCDBManager.h"
#include "AliCDBStorage.h"
#include "AliCDBEntry.h"
#include "AliVZEROCalibData.h"
#include "AliCTPTimeParams.h"
#include "AliVZEROdigit.h"
#include "AliVZERODigitizer.h"

ClassImp(AliVZERODigitizer)

 AliVZERODigitizer::AliVZERODigitizer()
                   :AliDigitizer(),
                    fCalibData(GetCalibData()),
                    fPhotoCathodeEfficiency(0.18),
                    fNdigits(0),
                    fDigits(0),
                    fSignalShape(NULL),
                    fPMResponse(NULL),
                    fSinglePhESpectrum(NULL)
   
{
  // default constructor

//    fNdigits = 0;
//    fDigits  = 0;
//   
//    fPhotoCathodeEfficiency =   0.18;
//    fPMVoltage              =  768.0;
//    fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277); 
   
//   fCalibData = GetCalibData();

  fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
  //  fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
  fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
			      3.68911e+00,1.01040e+00, 3.94675e-01);
  fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
  fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");

  // Now get the CTP L0->L1 delay
  AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
  if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
  AliCTPTimeParams *ctpParams = (AliCTPTimeParams*)entry->GetObject();
  Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;

  AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
  if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
  TH1F *delays = (TH1F*)entry2->GetObject();

  for(Int_t i = 0 ; i < 64; ++i) {

    for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
    fLeadingTime[i] = fTimeWidth[i] = 0;

    fPmGain[i] = fCalibData->GetGain(i);

    fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
    fAdcSigma[i][0]    = fCalibData->GetSigma(i); 
    fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
    fAdcSigma[i][1]    = fCalibData->GetSigma(i+64); 

    Int_t board = i / 8;
    fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
			     (Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
			    fCalibData->GetTimeResolution(board));
    fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
			      fCalibData->GetTimeResolution(board));
    fBinSize[i] = fCalibData->GetTimeResolution(board);
    fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
			(Float_t)fCalibData->GetRollOver(board))*25.0+
		       fCalibData->GetTimeOffset(i)+
		       l1Delay+
		       delays->GetBinContent(i+1)+
		       kV0Offset);

    fTime[i] = new Float_t[fNBins[i]];
    memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
  }

}

//____________________________________________________________________________ 
  AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
                    :AliDigitizer(manager),
		     fCalibData(GetCalibData()),
                     fPhotoCathodeEfficiency(0.18),
		     fNdigits(0),
                     fDigits(0),
		     fSignalShape(NULL),
                     fPMResponse(NULL),
                     fSinglePhESpectrum(NULL)
		                        
{
  // constructor
  // Initialize OCDB and containers used in the digitization
  
  fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
  //  fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
  fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
			      3.68911e+00,1.01040e+00, 3.94675e-01);
  fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
  fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");
  
  // Now get the CTP L0->L1 delay
  AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
  if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
  AliCTPTimeParams *ctpParams = (AliCTPTimeParams*)entry->GetObject();
  Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;

  AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
  if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
  TH1F *delays = (TH1F*)entry2->GetObject();

  for(Int_t i = 0 ; i < 64; ++i) {

    for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
    fLeadingTime[i] = fTimeWidth[i] = 0;

    fPmGain[i] = fCalibData->GetGain(i);

    fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
    fAdcSigma[i][0]    = fCalibData->GetSigma(i); 
    fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
    fAdcSigma[i][1]    = fCalibData->GetSigma(i+64); 

    Int_t board = i / 8;
    fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
			     (Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
			    fCalibData->GetTimeResolution(board));
    fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
			      fCalibData->GetTimeResolution(board));
    fBinSize[i] = fCalibData->GetTimeResolution(board);
    fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
			(Float_t)fCalibData->GetRollOver(board))*25.0+
		       fCalibData->GetTimeOffset(i)+
		       l1Delay+
		       delays->GetBinContent(i+1)+
		       kV0Offset);

    fTime[i] = new Float_t[fNBins[i]];
    memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
  }
}
           
//____________________________________________________________________________ 
  AliVZERODigitizer::~AliVZERODigitizer()
{
  // destructor
  
  if (fDigits) {
    fDigits->Delete();
    delete fDigits;
    fDigits=0; 
  }

  if (fSignalShape) {
    delete fSignalShape;
    fSignalShape = NULL;
  }
  if (fPMResponse) {
    delete fPMResponse;
    fPMResponse = NULL;
  }
  if (fSinglePhESpectrum) {
    delete fSinglePhESpectrum;
    fSinglePhESpectrum = NULL;
  }

  for(Int_t i = 0 ; i < 64; ++i) {
    if (fTime[i]) delete [] fTime[i];
  }
}

//_____________________________________________________________________________
Bool_t AliVZERODigitizer::Init()
{
  // Initialises the digitizer

  // Initialises the Digit array
  fDigits = new TClonesArray ("AliVZEROdigit", 1000);
  
  return kTRUE;
}

//____________________________________________________________________________
void AliVZERODigitizer::Exec(Option_t* /*option*/) 
{   
  // Creates digits from hits
  fNdigits     =    0;  

  for(Int_t i = 0 ; i < 64; ++i) {
    memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
    for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
    fLeadingTime[i] = fTimeWidth[i] = 0;
  }
  Float_t integral = fPMResponse->Integral(-kPMRespTime,2.*kPMRespTime);
  Float_t meansPhE = fSinglePhESpectrum->Mean(0,20);

  AliRunLoader* outRunLoader =  AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());    
  if (!outRunLoader) {
    Error("Exec", "Can not get output Run Loader");
    return;
  }
    
  AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");

  if (!outLoader) {
    Error("Exec", "Can not get output VZERO Loader");
    return;
  }

  const char* mode = "update";
  if(outRunLoader->GetEventNumber() == 0) mode = "recreate";
  outLoader->LoadDigits(mode);

  if (!outLoader->TreeD()) outLoader->MakeTree("D");
  outLoader->MakeDigitsContainer();
  TTree* treeD  = outLoader->TreeD();
  Int_t bufsize = 16000;
  treeD->Branch("VZERODigit", &fDigits, bufsize); 
  
  for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
     AliRunLoader* runLoader = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
     AliLoader* loader = runLoader->GetLoader("VZEROLoader");
     if (!loader) {
       Error("Exec", "Can not get VZERO Loader for input %d", iInput);
       continue;
	 }
      
     if (!runLoader->GetAliRun()) runLoader->LoadgAlice();

     AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
     if (!vzero) {
       Error("Exec", "No VZERO detector for input %d", iInput);
       continue;
	 }
      
     loader->LoadHits();
     TTree* treeH = loader->TreeH();
     if (!treeH) {
       Error("Exec", "Cannot get TreeH for input %d", iInput);
       continue; 
	 }
       
     TClonesArray* hits = vzero->Hits();

     //     Float_t lightYieldCorr[64] = {0.00707,0.00517,0.00520,0.00537,0.00735,0.00537,0.00733,0.00605,0.00778,0.00749,0.00701,0.00755,0.00732,0.00617,0.00669,0.00525,0.00752,0.00820,0.00797,0.01107,0.01080,0.00889,0.00880,0.01712,0.00866,0.00701,0.00811,0.00602,0.00879,0.00821,0.00861,0.01433,0.00061,0.00032,0.00099,0.00061,0.00034,0.00046,0.00031,0.00122,0.00155,0.00091,0.00032,0.00096,0.00120,0.00067,0.00113,0.00060,0.00158,0.00136,0.00340,0.00066,0.00076,0.00119,0.00129,0.00147,0.00137,0.00117,0.00088,0.00164,0.00128,0.00081,0.00121,0.00250};
     Float_t lightYieldCorr[64] = {0.01173,0.00874,0.00878,0.00886,0.01151,0.00925,0.01167,0.00983,0.01181,0.01243,0.01115,0.01220,0.01228,0.01053,0.01021,0.00930,0.01270,0.01411,0.01316,0.01894,0.01923,0.01860,0.01738,0.00305,0.01584,0.01251,0.01344,0.00310,0.01302,0.01266,0.01407,0.00338,0.00089,0.00100,0.00130,0.00081,0.00052,0.01230,0.00059,0.02452,0.02980,0.00137,0.01421,0.00116,0.00141,0.00092,0.02480,0.00096,0.00182,0.00174,0.00218,0.00106,0.00116,0.00160,0.00162,0.03097,0.00194,0.00171,0.00132,0.00239,0.00173,0.00118,0.00163,0.00262};
//  Now makes Digits from hits
     Int_t nTracks = (Int_t) treeH->GetEntries();
     for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
         vzero->ResetHits();
         treeH->GetEvent(iTrack);
         Int_t nHits = hits->GetEntriesFast();
         for (Int_t iHit = 0; iHit < nHits; iHit++) {
	   AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
	   Int_t nPhot = hit->Nphot();
	   Int_t cell  = hit->Cell();                          
	   Int_t pmt = Cell2Pmt(cell);
	   Float_t dt_scintillator = gRandom->Gaus(0,kIntTimeRes);
	   Float_t t = dt_scintillator + 1e9*hit->Tof();
	   if (pmt < 32) t += kV0CDelayCables;
	   t += fHptdcOffset[pmt];
	   Int_t nPhE;
	   Float_t prob = lightYieldCorr[pmt]*fPhotoCathodeEfficiency; // Optical losses included!
	   if (nPhot > 100)
	     nPhE =gRandom->Gaus(prob*Float_t(nPhot)+0.5,
				 sqrt(Float_t(nPhot)*prob*(1.-prob)));
	   else
	     nPhE = gRandom->Binomial(nPhot,prob);
	   Float_t charge = TMath::Qe()*fPmGain[pmt]*fBinSize[pmt]/integral;
	   for (Int_t iPhE = 0; iPhE < nPhE; ++iPhE) {
	     Float_t tPhE = t + fSignalShape->GetRandom(0,fBinSize[pmt]*Float_t(fNBins[pmt]));
	     Float_t gainVar = fSinglePhESpectrum->GetRandom(0,20)/meansPhE;
	     Int_t firstBin = TMath::Max(0,(Int_t)((tPhE-kPMRespTime)/fBinSize[pmt]));
	     Int_t lastBin = TMath::Min(fNBins[pmt]-1,(Int_t)((tPhE+2.*kPMRespTime)/fBinSize[pmt]));
	     for(Int_t iBin = firstBin; iBin <= lastBin; ++iBin) {
	       Float_t tempT = fBinSize[pmt]*(0.5+iBin)-tPhE;
	       fTime[pmt][iBin] += gainVar*charge*fPMResponse->Eval(tempT);
	     }
	   }         // ph.e. loop
         }           // hit loop
     }               // track loop
     loader->UnloadHits();
  }                  // input loop

  Float_t maximum = 0.9*fSignalShape->GetMaximum(0,200); // Not exact, one needs to do this on the convoluted
  Float_t integral2 = fSignalShape->Integral(0,200); // function. Anyway the effect is small <10% on the 2.5 ADC thr
  for (Int_t ipmt = 0; ipmt < 64; ++ipmt) {
    Float_t thr = fCalibData->GetDiscriThr(ipmt)*kChargePerADC*maximum*fBinSize[ipmt]/integral2;
    Bool_t ltFound = kFALSE, ttFound = kFALSE;
    for (Int_t iBin = 0; iBin < fNBins[ipmt]; ++iBin) {
      Float_t t = fBinSize[ipmt]*Float_t(iBin+0.5);
      if (fTime[ipmt][iBin] > thr) {
	if (!ltFound && (iBin < fNBinsLT[ipmt])) {
	  ltFound = kTRUE;
	  fLeadingTime[ipmt] = t;
	}
      }
      else {
	if (ltFound) {
	  if (!ttFound) {
	    ttFound = kTRUE;
	    fTimeWidth[ipmt] = t - fLeadingTime[ipmt];
	  }
	}
      }
      Float_t tadc = t - kADCTimeOffset;
      Int_t clock = kNClocks - Int_t(tadc/25.0) - 1;
      if (clock >= 0 && clock < kNClocks)
	fAdc[ipmt][clock] += fTime[ipmt][iBin]/kChargePerADC;
    }
    Int_t board = ipmt / 8;
    if (ltFound && ttFound) {
      fTimeWidth[ipmt] = fCalibData->GetWidthResolution(board)*
	Float_t(Int_t(fTimeWidth[ipmt]/fCalibData->GetWidthResolution(board)));
      if (fTimeWidth[ipmt] < Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board))
	fTimeWidth[ipmt] = Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board);
      if (fTimeWidth[ipmt] > Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board))
	fTimeWidth[ipmt] = Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board);
    }
  }

  Int_t evenOrOdd = gRandom->Integer(2);
  for (Int_t j=0; j<64; ++j){
    for (Int_t iClock = 0; iClock < kNClocks; ++iClock) {
      Int_t integrator = (iClock + evenOrOdd) % 2;
      fAdc[j][iClock]  += gRandom->Gaus(fAdcPedestal[j][integrator], fAdcSigma[j][integrator]);
    }
  }
	
  // Now add digits to the digit Tree 

  for (Int_t i=0; i<64; i++) {      
    //    printf(" cell %d adc ",i);
    //    for (Int_t j = 0; j < kNClocks; ++j)
    //      printf("%d ", Int_t(fAdc[i][j]));
    //    printf("\n");
    Float_t totADC = 0;
    for (Int_t j = 8; j <= 11; ++j) {
      Int_t tempadc = Int_t(fAdc[i][j]);
      if (tempadc > 1023) tempadc = 1023;
      Int_t integrator = (j + evenOrOdd) % 2;
      if ((Float_t(tempadc) - fAdcPedestal[i][integrator]) > (2.*fAdcSigma[i][integrator]))
	totADC += (Float_t(tempadc) - fAdcPedestal[i][integrator]);
    }
    totADC += fAdcPedestal[i][(10+evenOrOdd)%2];
    AddDigit(i, totADC, fLeadingTime[i], fTimeWidth[i], Bool_t((10+evenOrOdd)%2));
  }

  treeD->Fill();
  outLoader->WriteDigits("OVERWRITE");  
  outLoader->UnloadDigits();     
  ResetDigit();
}

//____________________________________________________________________________
void AliVZERODigitizer::AddDigit(Int_t PMnumber, Float_t adc, Float_t time, Float_t width, Bool_t integrator) 
 { 
 
// Adds Digit 
 
  TClonesArray &ldigits = *fDigits;  
	 
  new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time,width,kFALSE,kFALSE,integrator);
	 
}
//____________________________________________________________________________
void AliVZERODigitizer::ResetDigit()
{

// Clears Digits

  fNdigits = 0;
  if (fDigits) fDigits->Delete();
}

//____________________________________________________________________________
AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const

{
  AliCDBManager *man = AliCDBManager::Instance();

  AliCDBEntry *entry=0;

  entry = man->Get("VZERO/Calib/Data");

//   if(!entry){
//     AliWarning("Load of calibration data from default storage failed!");
//     AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
//     Int_t runNumber = man->GetRun();
//     entry = man->GetStorage("local://$ALICE_ROOT/OCDB")
//       ->Get("VZERO/Calib/Data",runNumber);
// 	
//   }

  // Retrieval of data in directory VZERO/Calib/Data:


  AliVZEROCalibData *calibdata = 0;

  if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
  if (!calibdata)  AliFatal("No calibration data from calibration database !");

  return calibdata;

}

double AliVZERODigitizer::SignalShape(double *x, double *par)
{
  // this function simulates the time
  // of arrival of the photons at the
  // photocathode
  Double_t xx = x[0];
  if (xx <= par[0]) return 0;
  Double_t a = 1./TMath::Power((xx-par[0])/par[1],1./par[2]);
  if (xx <= par[3]) return a;
  Double_t b = 1./TMath::Power((xx-par[3])/par[4],1./par[5]);
  Double_t f = a*b/(a+b);
  AliDebug(100,Form("x=%f func=%f",xx,f));
  return f;
}

double AliVZERODigitizer::PMResponse(double *x, double * /* par */)
{
  // this function describes the
  // PM time response to a single
  // photoelectron
  Double_t xx = x[0]+kPMRespTime;
  return xx*xx*TMath::Exp(-xx*xx/(kPMRespTime*kPMRespTime));
}

double AliVZERODigitizer::SinglePhESpectrum(double *x, double * /* par */)
{
  // this function describes the
  // PM amplitude response to a single
  // photoelectron
  Double_t xx = x[0];
  if (xx < 0) return 0;
  return (TMath::Poisson(xx,kPMNbOfSecElec)+kPMTransparency*TMath::Poisson(xx,1.0));
}

Int_t AliVZERODigitizer::Cell2Pmt(Int_t cell) const
{
  // The method maps the scintillator
  // indexes to the PM ones
  if (cell < 0 || cell >= 80) {
    AliError(Form("Wrong VZERO cell index %d",cell));
    return -1;
  }
  if (cell < 16) return cell;
  if (cell < 48) return 8 + cell/2;
  return cell - 16;
}
Commit	Line	Data
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
090026bf	16	/* $Id$ */
090026bf	17
b0d2c2d3	18	///_________________________________________________________________________
	19	///
	20	/// This class constructs Digits out of Hits
	21	///
	22	///
9e04c3b6	23
9e04c3b6	24	// --- Standard library ---
9e04c3b6	25
9e04c3b6	26	// --- ROOT system ---
090026bf	27	#include <TMath.h>
9e04c3b6	28	#include <TTree.h>
fe0adf2a	29	#include <TMap.h>
8bd3e27a	30	#include <TGeoManager.h>
	31	#include <TGeoPhysicalNode.h>
	32	#include <AliGeomManager.h>
e939a978	33	#include <TRandom.h>
9672d66e	34	#include <TF1.h>
4e2652e8	35	#include <TH1F.h>
9e04c3b6	36
9e04c3b6	37	// --- AliRoot header files ---
9e04c3b6	38	#include "AliRun.h"
	39	#include "AliVZERO.h"
	40	#include "AliVZEROhit.h"
9e04c3b6	41	#include "AliRunLoader.h"
9e04c3b6	42	#include "AliLoader.h"
fe0adf2a	43	#include "AliGRPObject.h"
9e04c3b6	44	#include "AliRunDigitizer.h"
ce7090f5	45	#include "AliCDBManager.h"
	46	#include "AliCDBStorage.h"
	47	#include "AliCDBEntry.h"
	48	#include "AliVZEROCalibData.h"
4e2652e8	49	#include "AliCTPTimeParams.h"
9e04c3b6	50	#include "AliVZEROdigit.h"
b0d2c2d3	51	#include "AliVZERODigitizer.h"
9e04c3b6	52
	53	ClassImp(AliVZERODigitizer)
	54
	55	AliVZERODigitizer::AliVZERODigitizer()
fe0adf2a	56	:AliDigitizer(),
	57	fCalibData(GetCalibData()),
	58	fPhotoCathodeEfficiency(0.18),
fe0adf2a	59	fNdigits(0),
fe0adf2a	60	fDigits(0),
4e2652e8	61	fSignalShape(NULL),
	62	fPMResponse(NULL),
	63	fSinglePhESpectrum(NULL)
0b2bea8b	64
9e04c3b6	65	{
b0d2c2d3	66	// default constructor
b0d2c2d3	67
0b2bea8b	68	// fNdigits = 0;
	69	// fDigits = 0;
	70	//
	71	// fPhotoCathodeEfficiency = 0.18;
	72	// fPMVoltage = 768.0;
	73	// fPMGain = TMath::Power((fPMVoltage / 112.5) ,7.04277);
ce7090f5	74
0b2bea8b	75	// fCalibData = GetCalibData();
9672d66e	76
9672d66e	77	fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
4e2652e8	78	// fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
	79	fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
	80	3.68911e+00,1.01040e+00, 3.94675e-01);
	81	fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
	82	fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");
	83
	84	// Now get the CTP L0->L1 delay
	85	AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
	86	if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
	87	AliCTPTimeParams ctpParams = (AliCTPTimeParams)entry->GetObject();
	88	Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;
	89
	90	AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
	91	if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
	92	TH1F delays = (TH1F)entry2->GetObject();
	93
	94	for(Int_t i = 0 ; i < 64; ++i) {
	95
	96	for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
	97	fLeadingTime[i] = fTimeWidth[i] = 0;
	98
	99	fPmGain[i] = fCalibData->GetGain(i);
	100
	101	fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
	102	fAdcSigma[i][0] = fCalibData->GetSigma(i);
	103	fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
	104	fAdcSigma[i][1] = fCalibData->GetSigma(i+64);
	105
	106	Int_t board = i / 8;
	107	fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
	108	(Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
	109	fCalibData->GetTimeResolution(board));
	110	fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
	111	fCalibData->GetTimeResolution(board));
	112	fBinSize[i] = fCalibData->GetTimeResolution(board);
	113	fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
	114	(Float_t)fCalibData->GetRollOver(board))*25.0+
	115	fCalibData->GetTimeOffset(i)+
	116	l1Delay+
	117	delays->GetBinContent(i+1)+
	118	kV0Offset);
	119
	120	fTime[i] = new Float_t[fNBins[i]];
	121	memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
	122	}
	123
9e04c3b6	124	}
	125
	126	//____________________________________________________________________________
	127	AliVZERODigitizer::AliVZERODigitizer(AliRunDigitizer* manager)
0b2bea8b	128	:AliDigitizer(manager),
	129	fCalibData(GetCalibData()),
	130	fPhotoCathodeEfficiency(0.18),
0b2bea8b	131	fNdigits(0),
fe0adf2a	132	fDigits(0),
4e2652e8	133	fSignalShape(NULL),
	134	fPMResponse(NULL),
	135	fSinglePhESpectrum(NULL)
0b2bea8b	136
9e04c3b6	137	{
9e04c3b6	138	// constructor
4e2652e8	139	// Initialize OCDB and containers used in the digitization
9e04c3b6	140
9672d66e	141	fSignalShape = new TF1("VZEROSignalShape",this,&AliVZERODigitizer::SignalShape,0,200,6,"AliVZERODigitizer","SignalShape");
4e2652e8	142	// fSignalShape->SetParameters(0,1.57345e1,-4.25603e-1,2.9,6.40982,3.69339e-01);
	143	fSignalShape->SetParameters(1.34330e+00,1.13007e+02,-4.95705e-01,
	144	3.68911e+00,1.01040e+00, 3.94675e-01);
	145	fPMResponse = new TF1("VZEROPMResponse",this,&AliVZERODigitizer::PMResponse,-kPMRespTime,2.*kPMRespTime,0,"AliVZERODigitizer","PMResponse");
	146	fSinglePhESpectrum = new TF1("VZEROSinglePhESpectrum",this,&AliVZERODigitizer::SinglePhESpectrum,0,20,0,"AliVZERODigitizer","SinglePhESpectrum");
ce7090f5	147
4e2652e8	148	// Now get the CTP L0->L1 delay
	149	AliCDBEntry *entry = AliCDBManager::Instance()->Get("GRP/CTP/CTPtiming");
	150	if (!entry) AliFatal("CTP timing parameters are not found in OCDB !");
	151	AliCTPTimeParams ctpParams = (AliCTPTimeParams)entry->GetObject();
	152	Float_t l1Delay = (Float_t)ctpParams->GetDelayL1L0()*25.0;
	153
	154	AliCDBEntry *entry2 = AliCDBManager::Instance()->Get("VZERO/Calib/TimeDelays");
	155	if (!entry2) AliFatal("VZERO time delays are not found in OCDB !");
	156	TH1F delays = (TH1F)entry2->GetObject();
	157
	158	for(Int_t i = 0 ; i < 64; ++i) {
	159
	160	for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
	161	fLeadingTime[i] = fTimeWidth[i] = 0;
	162
	163	fPmGain[i] = fCalibData->GetGain(i);
	164
	165	fAdcPedestal[i][0] = fCalibData->GetPedestal(i);
	166	fAdcSigma[i][0] = fCalibData->GetSigma(i);
	167	fAdcPedestal[i][1] = fCalibData->GetPedestal(i+64);
	168	fAdcSigma[i][1] = fCalibData->GetSigma(i+64);
	169
	170	Int_t board = i / 8;
	171	fNBins[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0+
	172	(Float_t)kMaxTDCWidth*fCalibData->GetWidthResolution(board))/
	173	fCalibData->GetTimeResolution(board));
	174	fNBinsLT[i] = TMath::Nint(((Float_t)(fCalibData->GetMatchWindow(board)+1)*25.0)/
	175	fCalibData->GetTimeResolution(board));
	176	fBinSize[i] = fCalibData->GetTimeResolution(board);
	177	fHptdcOffset[i] = (((Float_t)fCalibData->GetTriggerCountOffset(board)-
	178	(Float_t)fCalibData->GetRollOver(board))*25.0+
	179	fCalibData->GetTimeOffset(i)+
	180	l1Delay+
	181	delays->GetBinContent(i+1)+
	182	kV0Offset);
	183
	184	fTime[i] = new Float_t[fNBins[i]];
	185	memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
	186	}
9e04c3b6	187	}
	188
	189	//____________________________________________________________________________
	190	AliVZERODigitizer::~AliVZERODigitizer()
	191	{
	192	// destructor
	193
	194	if (fDigits) {
	195	fDigits->Delete();
	196	delete fDigits;
b0d2c2d3	197	fDigits=0;
b0d2c2d3	198	}
9672d66e	199
	200	if (fSignalShape) {
	201	delete fSignalShape;
	202	fSignalShape = NULL;
	203	}
4e2652e8	204	if (fPMResponse) {
	205	delete fPMResponse;
	206	fPMResponse = NULL;
	207	}
	208	if (fSinglePhESpectrum) {
	209	delete fSinglePhESpectrum;
	210	fSinglePhESpectrum = NULL;
	211	}
	212
	213	for(Int_t i = 0 ; i < 64; ++i) {
	214	if (fTime[i]) delete [] fTime[i];
	215	}
9e04c3b6	216	}
9e04c3b6	217
b0d2c2d3	218	//_____________________________________________________________________________
b0d2c2d3	219	Bool_t AliVZERODigitizer::Init()
9e04c3b6	220	{
b0d2c2d3	221	// Initialises the digitizer
9e04c3b6	222
b0d2c2d3	223	// Initialises the Digit array
9e04c3b6	224	fDigits = new TClonesArray ("AliVZEROdigit", 1000);
8bd3e27a	225
b0d2c2d3	226	return kTRUE;
9e04c3b6	227	}
	228
	229	//____________________________________________________________________________
b0d2c2d3	230	void AliVZERODigitizer::Exec(Option_t* /option/)
ce7090f5	231	{
b0d2c2d3	232	// Creates digits from hits
ce7090f5	233	fNdigits = 0;
4e2652e8	234
	235	for(Int_t i = 0 ; i < 64; ++i) {
	236	memset(fTime[i],0,fNBins[i]*sizeof(Float_t));
	237	for(Int_t j = 0; j < kNClocks; ++j) fAdc[i][j] = 0;
	238	fLeadingTime[i] = fTimeWidth[i] = 0;
fad64858	239	}
4e2652e8	240	Float_t integral = fPMResponse->Integral(-kPMRespTime,2.*kPMRespTime);
	241	Float_t meansPhE = fSinglePhESpectrum->Mean(0,20);
	242
fad64858	243	AliRunLoader* outRunLoader = AliRunLoader::GetRunLoader(fManager->GetOutputFolderName());
b0d2c2d3	244	if (!outRunLoader) {
b0d2c2d3	245	Error("Exec", "Can not get output Run Loader");
fad64858	246	return;
fad64858	247	}
ce7090f5	248
b0d2c2d3	249	AliLoader* outLoader = outRunLoader->GetLoader("VZEROLoader");
fad64858	250
b0d2c2d3	251	if (!outLoader) {
b0d2c2d3	252	Error("Exec", "Can not get output VZERO Loader");
fad64858	253	return;
fad64858	254	}
b0d2c2d3	255
e539620f	256	const char* mode = "update";
	257	if(outRunLoader->GetEventNumber() == 0) mode = "recreate";
	258	outLoader->LoadDigits(mode);
fad64858	259
b0d2c2d3	260	if (!outLoader->TreeD()) outLoader->MakeTree("D");
b0d2c2d3	261	outLoader->MakeDigitsContainer();
ce7090f5	262	TTree* treeD = outLoader->TreeD();
b0d2c2d3	263	Int_t bufsize = 16000;
b0d2c2d3	264	treeD->Branch("VZERODigit", &fDigits, bufsize);
c299dbe4	265
b0d2c2d3	266	for (Int_t iInput = 0; iInput < fManager->GetNinputs(); iInput++) {
fad64858	267	AliRunLoader* runLoader = AliRunLoader::GetRunLoader(fManager->GetInputFolderName(iInput));
8bd3e27a	268	AliLoader* loader = runLoader->GetLoader("VZEROLoader");
	269	if (!loader) {
	270	Error("Exec", "Can not get VZERO Loader for input %d", iInput);
fad64858	271	continue;
fad64858	272	}
ce7090f5	273
8bd3e27a	274	if (!runLoader->GetAliRun()) runLoader->LoadgAlice();
b0d2c2d3	275
8bd3e27a	276	AliVZERO* vzero = (AliVZERO*) runLoader->GetAliRun()->GetDetector("VZERO");
	277	if (!vzero) {
	278	Error("Exec", "No VZERO detector for input %d", iInput);
fad64858	279	continue;
fad64858	280	}
9e04c3b6	281
8bd3e27a	282	loader->LoadHits();
	283	TTree* treeH = loader->TreeH();
	284	if (!treeH) {
	285	Error("Exec", "Cannot get TreeH for input %d", iInput);
fad64858	286	continue;
fad64858	287	}
c299dbe4	288
8bd3e27a	289	TClonesArray* hits = vzero->Hits();
4e2652e8	290
	291	// Float_t lightYieldCorr[64] = {0.00707,0.00517,0.00520,0.00537,0.00735,0.00537,0.00733,0.00605,0.00778,0.00749,0.00701,0.00755,0.00732,0.00617,0.00669,0.00525,0.00752,0.00820,0.00797,0.01107,0.01080,0.00889,0.00880,0.01712,0.00866,0.00701,0.00811,0.00602,0.00879,0.00821,0.00861,0.01433,0.00061,0.00032,0.00099,0.00061,0.00034,0.00046,0.00031,0.00122,0.00155,0.00091,0.00032,0.00096,0.00120,0.00067,0.00113,0.00060,0.00158,0.00136,0.00340,0.00066,0.00076,0.00119,0.00129,0.00147,0.00137,0.00117,0.00088,0.00164,0.00128,0.00081,0.00121,0.00250};
	292	Float_t lightYieldCorr[64] = {0.01173,0.00874,0.00878,0.00886,0.01151,0.00925,0.01167,0.00983,0.01181,0.01243,0.01115,0.01220,0.01228,0.01053,0.01021,0.00930,0.01270,0.01411,0.01316,0.01894,0.01923,0.01860,0.01738,0.00305,0.01584,0.01251,0.01344,0.00310,0.01302,0.01266,0.01407,0.00338,0.00089,0.00100,0.00130,0.00081,0.00052,0.01230,0.00059,0.02452,0.02980,0.00137,0.01421,0.00116,0.00141,0.00092,0.02480,0.00096,0.00182,0.00174,0.00218,0.00106,0.00116,0.00160,0.00162,0.03097,0.00194,0.00171,0.00132,0.00239,0.00173,0.00118,0.00163,0.00262};
b0d2c2d3	293	// Now makes Digits from hits
8bd3e27a	294	Int_t nTracks = (Int_t) treeH->GetEntries();
8bd3e27a	295	for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
8bd3e27a	296	vzero->ResetHits();
	297	treeH->GetEvent(iTrack);
	298	Int_t nHits = hits->GetEntriesFast();
	299	for (Int_t iHit = 0; iHit < nHits; iHit++) {
4e2652e8	300	AliVZEROhit* hit = (AliVZEROhit *)hits->UncheckedAt(iHit);
	301	Int_t nPhot = hit->Nphot();
	302	Int_t cell = hit->Cell();
	303	Int_t pmt = Cell2Pmt(cell);
	304	Float_t dt_scintillator = gRandom->Gaus(0,kIntTimeRes);
	305	Float_t t = dt_scintillator + 1e9*hit->Tof();
	306	if (pmt < 32) t += kV0CDelayCables;
	307	t += fHptdcOffset[pmt];
	308	Int_t nPhE;
	309	Float_t prob = lightYieldCorr[pmt]*fPhotoCathodeEfficiency; // Optical losses included!
	310	if (nPhot > 100)
	311	nPhE =gRandom->Gaus(prob*Float_t(nPhot)+0.5,
	312	sqrt(Float_t(nPhot)prob(1.-prob)));
	313	else
	314	nPhE = gRandom->Binomial(nPhot,prob);
	315	Float_t charge = TMath::Qe()fPmGain[pmt]fBinSize[pmt]/integral;
	316	for (Int_t iPhE = 0; iPhE < nPhE; ++iPhE) {
	317	Float_t tPhE = t + fSignalShape->GetRandom(0,fBinSize[pmt]*Float_t(fNBins[pmt]));
	318	Float_t gainVar = fSinglePhESpectrum->GetRandom(0,20)/meansPhE;
	319	Int_t firstBin = TMath::Max(0,(Int_t)((tPhE-kPMRespTime)/fBinSize[pmt]));
	320	Int_t lastBin = TMath::Min(fNBins[pmt]-1,(Int_t)((tPhE+2.*kPMRespTime)/fBinSize[pmt]));
	321	for(Int_t iBin = firstBin; iBin <= lastBin; ++iBin) {
	322	Float_t tempT = fBinSize[pmt]*(0.5+iBin)-tPhE;
	323	fTime[pmt][iBin] += gainVarchargefPMResponse->Eval(tempT);
	324	}
	325	} // ph.e. loop
	326	} // hit loop
	327	} // track loop
8bd3e27a	328	loader->UnloadHits();
4e2652e8	329	} // input loop
	330
	331	Float_t maximum = 0.9*fSignalShape->GetMaximum(0,200); // Not exact, one needs to do this on the convoluted
	332	Float_t integral2 = fSignalShape->Integral(0,200); // function. Anyway the effect is small <10% on the 2.5 ADC thr
	333	for (Int_t ipmt = 0; ipmt < 64; ++ipmt) {
	334	Float_t thr = fCalibData->GetDiscriThr(ipmt)kChargePerADCmaximum*fBinSize[ipmt]/integral2;
	335	Bool_t ltFound = kFALSE, ttFound = kFALSE;
	336	for (Int_t iBin = 0; iBin < fNBins[ipmt]; ++iBin) {
	337	Float_t t = fBinSize[ipmt]*Float_t(iBin+0.5);
	338	if (fTime[ipmt][iBin] > thr) {
	339	if (!ltFound && (iBin < fNBinsLT[ipmt])) {
	340	ltFound = kTRUE;
	341	fLeadingTime[ipmt] = t;
	342	}
	343	}
	344	else {
	345	if (ltFound) {
	346	if (!ttFound) {
	347	ttFound = kTRUE;
	348	fTimeWidth[ipmt] = t - fLeadingTime[ipmt];
	349	}
	350	}
	351	}
	352	Float_t tadc = t - kADCTimeOffset;
	353	Int_t clock = kNClocks - Int_t(tadc/25.0) - 1;
	354	if (clock >= 0 && clock < kNClocks)
	355	fAdc[ipmt][clock] += fTime[ipmt][iBin]/kChargePerADC;
	356	}
	357	Int_t board = ipmt / 8;
	358	if (ltFound && ttFound) {
	359	fTimeWidth[ipmt] = fCalibData->GetWidthResolution(board)*
	360	Float_t(Int_t(fTimeWidth[ipmt]/fCalibData->GetWidthResolution(board)));
	361	if (fTimeWidth[ipmt] < Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board))
	362	fTimeWidth[ipmt] = Float_t(kMinTDCWidth)*fCalibData->GetWidthResolution(board);
	363	if (fTimeWidth[ipmt] > Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board))
	364	fTimeWidth[ipmt] = Float_t(kMaxTDCWidth)*fCalibData->GetWidthResolution(board);
	365	}
	366	}
b0d2c2d3	367
4e2652e8	368	Int_t evenOrOdd = gRandom->Integer(2);
	369	for (Int_t j=0; j<64; ++j){
	370	for (Int_t iClock = 0; iClock < kNClocks; ++iClock) {
	371	Int_t integrator = (iClock + evenOrOdd) % 2;
	372	fAdc[j][iClock] += gRandom->Gaus(fAdcPedestal[j][integrator], fAdcSigma[j][integrator]);
	373	}
	374	}
20277079	375
4e2652e8	376	// Now add digits to the digit Tree
	377
	378	for (Int_t i=0; i<64; i++) {
	379	// printf(" cell %d adc ",i);
	380	// for (Int_t j = 0; j < kNClocks; ++j)
	381	// printf("%d ", Int_t(fAdc[i][j]));
	382	// printf("\n");
	383	Float_t totADC = 0;
	384	for (Int_t j = 8; j <= 11; ++j) {
	385	Int_t tempadc = Int_t(fAdc[i][j]);
	386	if (tempadc > 1023) tempadc = 1023;
	387	Int_t integrator = (j + evenOrOdd) % 2;
	388	if ((Float_t(tempadc) - fAdcPedestal[i][integrator]) > (2.*fAdcSigma[i][integrator]))
	389	totADC += (Float_t(tempadc) - fAdcPedestal[i][integrator]);
	390	}
	391	totADC += fAdcPedestal[i][(10+evenOrOdd)%2];
	392	AddDigit(i, totADC, fLeadingTime[i], fTimeWidth[i], Bool_t((10+evenOrOdd)%2));
	393	}
	394
b0d2c2d3	395	treeD->Fill();
	396	outLoader->WriteDigits("OVERWRITE");
	397	outLoader->UnloadDigits();
	398	ResetDigit();
9e04c3b6	399	}
	400
	401	//____________________________________________________________________________
4e2652e8	402	void AliVZERODigitizer::AddDigit(Int_t PMnumber, Float_t adc, Float_t time, Float_t width, Bool_t integrator)
9e04c3b6	403	{
	404
	405	// Adds Digit
	406
	407	TClonesArray &ldigits = *fDigits;
fad64858	408
4e2652e8	409	new(ldigits[fNdigits++]) AliVZEROdigit(PMnumber,adc,time,width,kFALSE,kFALSE,integrator);
fad64858	410
9e04c3b6	411	}
	412	//____________________________________________________________________________
	413	void AliVZERODigitizer::ResetDigit()
	414	{
fe0adf2a	415
9e04c3b6	416	// Clears Digits
fe0adf2a	417
9e04c3b6	418	fNdigits = 0;
b0d2c2d3	419	if (fDigits) fDigits->Delete();
9e04c3b6	420	}
ce7090f5	421
	422	//____________________________________________________________________________
	423	AliVZEROCalibData* AliVZERODigitizer::GetCalibData() const
	424
	425	{
c0b82b5a	426	AliCDBManager *man = AliCDBManager::Instance();
ce7090f5	427
c0b82b5a	428	AliCDBEntry *entry=0;
ce7090f5	429
c0b82b5a	430	entry = man->Get("VZERO/Calib/Data");
c0b82b5a	431
df791951	432	// if(!entry){
	433	// AliWarning("Load of calibration data from default storage failed!");
	434	// AliWarning("Calibration data will be loaded from local storage ($ALICE_ROOT)");
	435	// Int_t runNumber = man->GetRun();
162637e4	436	// entry = man->GetStorage("local://$ALICE_ROOT/OCDB")
df791951	437	// ->Get("VZERO/Calib/Data",runNumber);
	438	//
	439	// }
c0b82b5a	440
c0b82b5a	441	// Retrieval of data in directory VZERO/Calib/Data:
ce7090f5	442
ce7090f5	443
c0b82b5a	444	AliVZEROCalibData *calibdata = 0;
ce7090f5	445
c0b82b5a	446	if (entry) calibdata = (AliVZEROCalibData*) entry->GetObject();
df791951	447	if (!calibdata) AliFatal("No calibration data from calibration database !");
ce7090f5	448
c0b82b5a	449	return calibdata;
ce7090f5	450
	451	}
	452
9672d66e	453	double AliVZERODigitizer::SignalShape(double x, double par)
9672d66e	454	{
4e2652e8	455	// this function simulates the time
	456	// of arrival of the photons at the
	457	// photocathode
9672d66e	458	Double_t xx = x[0];
	459	if (xx <= par[0]) return 0;
	460	Double_t a = 1./TMath::Power((xx-par[0])/par[1],1./par[2]);
	461	if (xx <= par[3]) return a;
	462	Double_t b = 1./TMath::Power((xx-par[3])/par[4],1./par[5]);
9672d66e	463	Double_t f = a*b/(a+b);
	464	AliDebug(100,Form("x=%f func=%f",xx,f));
	465	return f;
	466	}
4e2652e8	467
	468	double AliVZERODigitizer::PMResponse(double x, double /* par */)
	469	{
	470	// this function describes the
	471	// PM time response to a single
	472	// photoelectron
	473	Double_t xx = x[0]+kPMRespTime;
	474	return xxxxTMath::Exp(-xxxx/(kPMRespTimekPMRespTime));
	475	}
	476
	477	double AliVZERODigitizer::SinglePhESpectrum(double x, double /* par */)
	478	{
	479	// this function describes the
	480	// PM amplitude response to a single
	481	// photoelectron
	482	Double_t xx = x[0];
	483	if (xx < 0) return 0;
	484	return (TMath::Poisson(xx,kPMNbOfSecElec)+kPMTransparency*TMath::Poisson(xx,1.0));
	485	}
	486
	487	Int_t AliVZERODigitizer::Cell2Pmt(Int_t cell) const
	488	{
	489	// The method maps the scintillator
	490	// indexes to the PM ones
	491	if (cell < 0 \|\| cell >= 80) {
	492	AliError(Form("Wrong VZERO cell index %d",cell));
	493	return -1;
	494	}
	495	if (cell < 16) return cell;
	496	if (cell < 48) return 8 + cell/2;
	497	return cell - 16;
	498	}