[u/mrichter/AliRoot.git] / ZDC / AliZDCMerger.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.                  *
 **************************************************************************/


///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  			ZDC event merging class                              //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

// --- ROOT system
#include <iostream.h>
#include <TTree.h>
#include <TFile.h>
#include <TDirectory.h>
#include <TNtuple.h>
#include <TSystem.h>

// --- AliRoot header files
#include "AliZDCMerger.h"
#include "AliZDC.h"
#include "AliZDCHit.h"
#include "AliZDCMergedHit.h"
#include "AliZDCDigit.h"
#include "AliZDCFragment.h"
#include "AliRun.h"
#include "AliDetector.h"
#include "AliHeader.h"
#include "AliGenEventHeader.h"
#include "AliGenHijingEventHeader.h"

ClassImp(AliZDCMerger)

//____________________________________________________________________________
AliZDCMerger::AliZDCMerger()
{
// Default constructor    
    fMerge       = kDigitize;
//   fMerge       = kMerge;
    fFnBgr       = 0;
    fBgrFile     = 0;
    fNEvBgr	 = 0;
    fTrHBgr      = 0;
    fTrSDBgr     = 0;
    fImpPar      = 0;
    fSpecn       = 0;
    fSpecp       = 0;
    fFreeSpn     = 0;
    fFreeSpp     = 0;
    fFnSpecn     = 0;
    fSpecnFile   = 0;
    fFnSpecp     = 0;
    fSpecpFile   = 0;
    fNMhits	 = 0;
     
}

//____________________________________________________________________________
AliZDCMerger::~AliZDCMerger()
{
// Destructor
    if (fBgrFile)    delete fBgrFile;
    if (fTrHBgr)     delete fTrHBgr;
    if (fTrSDBgr)    delete fTrSDBgr;
    if (fHitsBgr)    delete fHitsBgr;
    if (fSpecnFile)  delete fSpecnFile;
    if (fSpecpFile)  delete fSpecpFile;
}

//____________________________________________________________________________
void AliZDCMerger::InitMerging()
{
    // Hits tree, impact parameter, num. of spectators n & p 
    // 		in background (full Hijing) event
    Float_t b;
    Int_t nspecn, nspecp;
    Background(b, nspecn, nspecp);

    // Production of nuclear fragments -> num. of FREE spectators n & p
    Fragmentation(b, nspecn, nspecp, fFreeSpn, fFreeSpp);
    
    // Extract from spectators distribution the signal events:
    // NFreeSpectatorN spectator n & NFreeSpectatorP spectator p 
    Mixing();
}

//____________________________________________________________________________
void AliZDCMerger::Background(Float_t &fImpPar, Int_t &fSpecn, Int_t &fSpecp)
{
    
    // --- Open the background file
    if (fMerge && !fBgrFile) fBgrFile = OpenBgrFile();
    
    // --- Read from the TreeE impact parameter (b),
    //     # of spectators n and p (fSpecn, fSpecp)
    fBgrFile->cd();

//    // Get AliRun object from file or create it if not on file
//    gAlice = (AliRun*)fBgrFile->Get("gAlice");
//    if (!gAlice) {
//      gAlice = (AliRun*)fBgrFile->Get("gAlice");
//      if (gAlice) printf("AliRun object found on file\n");
//      if (!gAlice) {
//	  printf("\n create new gAlice object");
//	  gAlice = new AliRun("gAlice","Alice test program");
//      }
//    }

    AliHeader *header = gAlice->GetHeader();
    AliGenEventHeader* mcHeader = header->GenEventHeader();
    fImpPar = ((AliGenHijingEventHeader*) mcHeader)->ImpactParameter();
    fSpecn  = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsn();
    fSpecp  = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsp();
    printf("\n	HIJING simulation - b = %f fm, Nspecn = %d, Nspecp = %d\n",fImpPar,fSpecn,fSpecp);
}

//____________________________________________________________________________
TFile* AliZDCMerger::OpenBgrFile()
{
    // Initialise background event
    TFile *file = new TFile(fFnBgr,"UPDATE");
    printf("\n AliZDCMerger --- Background event -> %s file opened \n", fFnBgr);
    fHitsBgr = new TClonesArray("AliZDCHit",1000);
    fMHits   = new TClonesArray("AliZDCMergedHit",1000);
    return file;
}

//____________________________________________________________________________
void AliZDCMerger::Fragmentation(Float_t fImpPar, Int_t fSpecn, Int_t fSpecp,
                                 Int_t &fFreeSpn, Int_t &fFreeSpp)
{
    Int_t j, zz[100], nn[100], nAlpha, Ztot, Ntot;
    AliZDCFragment *frag = new AliZDCFragment(fImpPar);
    for(j=0; j<=99; j++){
       zz[j] =0;
       nn[j] =0;
    }

    // Fragments generation
    frag->GenerateIMF(zz, nAlpha);

    // Attach neutrons
    Ztot=0;
    Ntot=0;
    frag->AttachNeutrons(zz, nn, Ztot, Ntot);
    fFreeSpn = fSpecn-Ztot-2*nAlpha;
    fFreeSpp = fSpecp-Ntot-2*nAlpha;
    printf("\n	Fragmentation -> FreeSpn = %d, FreeSpp = %d\n",fFreeSpn,fFreeSpp);
}

//____________________________________________________________________________
void AliZDCMerger::Mixing()
{
    
//    printf("\n	AliZDCMerger->Mixing\n");
       
    // ### Background event Hits ###########################################
    fBgrFile->cd();
//    fBgrFile->ls();
    
   AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
//    if(ZDC) printf("\n	Ho trovato lo ZDC!\n");

    // Hits tree
    if(fTrHBgr) delete fTrHBgr;
    fTrHBgr = 0;        
    // SDigits tree
    if(fTrSDBgr) delete fTrSDBgr;
    fTrSDBgr = 0;    

//    fNEvBgr = 0; // Let's suppose to have 1 full Hijing event per file

    // Hits tree
    char treeBgrName[20];
    sprintf(treeBgrName,"TreeH%d",fNEvBgr);
    fTrHBgr = (TTree*)gDirectory->Get(treeBgrName); 
    if(!fTrHBgr){
      printf("\n ERROR -> Can't find TreeH%d in background file\n",fNEvBgr);
    }    
//    fTrHBgr->Print();
    
    // Branch address
    TBranch *branch;
    char branchname[20];
    sprintf(branchname,"%s",ZDC->GetName());
    if(fTrHBgr && fHitsBgr){
//      printf("\n	fTrHBgr!=0 && fHitsBgr!=0\n");
      branch = fTrHBgr->GetBranch(branchname);
      if(branch) branch->SetAddress(&fHitsBgr);
    }
    
    Int_t ntracks =  (Int_t) fTrHBgr->GetEntries();
//    printf("\n	--- ntracks = %d\n\n", ntracks);
    
    Int_t itrack, nhits, ihit, j, sector[2];
    AliZDCHit* zdcHit;
    AliZDCMergedHit *MHit;
    Float_t MHits[7];
    TClonesArray &sdigits = *fMHits;	// SDigits TCArray
    fNMhits = 0;

    // --- Tracks loop
    for(itrack=0; itrack<ntracks; itrack++){
//       printf("               itrack = %d", itrack);
//       gAlice->ResetHits();
       fTrHBgr->GetEvent(itrack);
       
//       for(AliZDCHit* zdcHit=(AliZDCHit*)ZDC->FirstHit(-1); 
//	   zdcHit;
//	   zdcHit = (AliZDCHit*)ZDC->NextHit()){ 

       nhits = fHitsBgr->GetEntries();
//       nhits = ZDCdp->GetNhits();
//       printf(" 	      nhits = %d \n", nhits);
       for(ihit=0; ihit<nhits; ihit++){    
	  zdcHit = (AliZDCHit*) fHitsBgr->UncheckedAt(ihit);

	    for(j=0; j<2; j++) sector[j] = zdcHit->GetVolume(j);
	    MHits[0] = zdcHit->GetPrimKinEn();
	    MHits[1] = zdcHit->GetXImpact();
	    MHits[2] = zdcHit->GetYImpact();
	    MHits[3] = zdcHit->GetSFlag();
	    MHits[4] = zdcHit->GetLightPMQ();
	    MHits[5] = zdcHit->GetLightPMC();
	    MHits[6] = zdcHit->GetEnergy();
	    MHit = new AliZDCMergedHit(sector, MHits);
//	    MHit->Print("");
  	    new((*fMHits)[fNMhits]) AliZDCMergedHit(*MHit);
	    new (sdigits[fNMhits])  AliZDCMergedHit(*MHit);
	    delete MHit;
	    fNMhits++;
	  }//Hits loop
	  
    } // Tracks loop
//    printf("\n	fNMhits (after bckg) = %d, \n",fNMhits); 
//    fMHits->Dump();
//    AliZDCMergedHit *pippo7 = (AliZDCMergedHit*) fMHits->At(7);
//    pippo7->Dump();
    
        
    // ### Signal event Hits ###########################################
    // --- Neutrons
    ExtractSignal(1);
        
    // --- Protons
    ExtractSignal(2);
//    printf("\n	fNMhits (after signal) = %d \n",fNMhits); 
        
}

//____________________________________________________________________________
void AliZDCMerger::ExtractSignal(Int_t SpecType)
{

// printf("\n	Entering in Extract Signal\n");
 
 Int_t NumEvents = 0;
 if(SpecType == 1){		// --- Signal for spectator neutrons
   fFnSpecn = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZNsignalntu.root");
   fSpecnFile = TFile::Open(fFnSpecn,"R");
   fSpecnFile->cd();
//   printf("\n	--- ExtractSignal x n: file %s opened\n", fFnSpecn);
   NumEvents = fFreeSpn;
 }
 else if(SpecType == 2){	// --- Signal for spectator protons
   fFnSpecp = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZPsignalntu.root");
   fSpecpFile = TFile::Open(fFnSpecp,"R");
   fSpecpFile->cd();
//   printf("\n	--- ExtractSignal x p: file %s opened\n", fFnSpecp);
   NumEvents = fFreeSpp;
 }
// printf("\n		# of free spectator = %d\n", NumEvents);
// printf("\n         fNMhits (before adding signal) = %d\n",fNMhits);

  TNtuple *ZDCSignal = (TNtuple*) gDirectory->Get("ZDCSignal");
  Int_t nentries = (Int_t) ZDCSignal->GetEntries();
//  printf("\n   # entries = %d\n", nentries);
  Int_t i, j, k;
  
  AliZDCMergedHit *MHit; 
  Float_t *entry, HitsSpec[7];
  Int_t iev, rnd, Volume[2];
  for(iev=0; iev<NumEvents; iev++){
     rnd = (Int_t) (1000*gRandom->Rndm());
//     printf("\n      rnd = %d\n", rnd);
     for(i=0; i<nentries; i++){  
  	ZDCSignal->GetEvent(i);
  	entry = ZDCSignal->GetArgs();
  	if(entry[0] == rnd){
//        printf("\n   entry[0] = %f\n", entry[0]);
          for(k=0; k<2; k++) Volume[k] = (Int_t) entry[k+1];
          for(j=0; j<7; j++){
             HitsSpec[j] = entry[j+3];
          }
	  MHit = new AliZDCMergedHit(Volume, HitsSpec);
	  new((*fMHits)[fNMhits++]) AliZDCMergedHit(*MHit);
	  delete MHit;
  	}
  	else if(entry[0] > rnd) break;
     }
  }
  
  if(SpecType ==1){
//    printf("\n         fNMhits (after n signal) = %d\n",fNMhits);
    fSpecnFile->Close();
  }
  else if(SpecType == 2){
//    printf("\n         fNMhits (after p signal) = %d\n",fNMhits);
    fSpecpFile->Close();
  }
      
}

//____________________________________________________________________________
void AliZDCMerger::Digitize(Int_t fNMhits, TClonesArray *fMHits)
{

//  printf("\n	AliZDCMerger->Digitize()");

  AliZDC *ZDC = (AliZDC *)gAlice->GetModule("ZDC");
//  if(ZDC) printf("\n 	Ho trovato lo ZDC!\n");

  Int_t lightQ, lightC, sector[2], digit;
  Int_t PMCZN = 0, PMCZP = 0, PMQZN[4], PMQZP[4], PMZEM1 = 0, PMZEM2 = 0;
  Int_t i;
  for(i=0; i<4; i++){
     PMQZN[i] = 0;
     PMQZP[i] = 0;
  }
  
  AliZDCMergedHit *MHit;
  Int_t imhit;
//  printf("\n	   fNMHits = %d\n", fNMhits);
  // Loop over SDigits
  for(imhit=0; imhit<fNMhits; imhit++){
     
     MHit = (AliZDCMergedHit*) fMHits->UncheckedAt(imhit);
     sector[0] = MHit->GetSector(0);
     sector[1] = MHit->GetSector(1);
  if((sector[1]!=1) && (sector[1]!=2) && (sector[1]!=3) && (sector[1]!=4)){
//     printf("\n  *** ERROR!!! sector[0] = %d, sector[1] = %d\n",
// 	      sector[0], sector[1]);
       sector[1] = 0;
   }
     lightQ    = Int_t(MHit->GetLightPMQ());
     lightC    = Int_t(MHit->GetLightPMC());
//     printf("\n    imhit = %d -> DET. = %d, quad = %d,PMQ = %d, PMC = %d", 
//      imhit,sector[0], sector[1],lightQ, lightC);
     
     if(sector[0] == 1){   	   //ZN 
       PMCZN = PMCZN + lightC;
       PMQZN[sector[1]-1] = PMQZN[sector[1]-1] + lightQ;
     }
     else if(sector[0] == 2){	   //ZP 
       PMCZP = PMCZP + lightC;
       PMQZP[sector[1]-1] = PMQZP[sector[1]-1] + lightQ;
     }
     else if(sector[0] == 3){	   //ZEM 
       if(sector[1] ==1) PMZEM1 = PMZEM1 + lightC;
       else              PMZEM2 = PMZEM2 + lightQ;
     }
  } // SDigits loop
      
  // ### Digits creation ###############################################
  // Create digits for ZN
  Int_t PedValue;
  sector[0] = 1; // Detector = ZN
  sector[1] = 0; // Common PM ADC
  digit = Phe2ADCch(1, 0, PMCZN);
//  printf("\n\n	ZN ###	PMCZN = %d	ADCZN = %d",PMCZN, digit);
  PedValue = AddPedestal();
  digit += PedValue;
//  printf("	PedValue = %d",PedValue);
  ZDC->AddDigit(sector, digit);
  Int_t j;
  for(j=0; j<4; j++){
    sector[1] = j+1; // Towers PM ADCs
    digit = Phe2ADCch(1, j+1, PMQZN[j]);
//    printf("\n		PMQZN[%d] = %d	phe	ADCZN[%d] = %d ADCch",j,PMQZN[j],j,digit);
    PedValue = AddPedestal();
    digit += PedValue;
//    printf("	PedValue = %d",PedValue);
    ZDC->AddDigit(sector, digit);
  }
//  printf("\n");
  
  // Create digits for ZP
  sector[0] = 2; // Detector = ZP
  sector[1] = 0; // Common PM ADC
  digit = Phe2ADCch(2, 0, PMCZP);
//  printf("\n	ZP --- PMCZP = %d	phe	ADCZP = %d ADCch",PMCZP,digit);
  PedValue = AddPedestal();
  digit += PedValue;
  printf("	PedValue = %d",PedValue);
  ZDC->AddDigit(sector, digit);
  for(j=0; j<4; j++){
    sector[1] = j+1; // Towers PM ADCs
    digit = Phe2ADCch(2, j+1, PMQZP[j]);
//    printf("\n	       PMQZP[%d] = %d	phe	ADCZP[%d] = %d ADCch",j,PMQZP[j],j,digit);
    PedValue = AddPedestal();
    digit += PedValue;
//    printf("	PedValue = %d",PedValue);
    ZDC->AddDigit(sector, digit);
  }
//  printf("\n");
  
  // Create digits for ZEM
  sector[0] = 3; 
  sector[1] = 1; // Detector = ZEM1
  digit  = Phe2ADCch(3, 1, PMZEM1);
//  printf("\n  ZEM *** PMZEM1 = %d      phe     ADCZEM1 = %d ADCch",PMZEM1,digit);
  PedValue = AddPedestal();
  digit += PedValue;
//  printf("  PedValue = %d\n",PedValue);
  ZDC->AddDigit(sector, digit); 
  sector[1] = 2; // Detector = ZEM2
  digit  = Phe2ADCch(3, 2, PMZEM2);
//  printf("\n  ZEM *** PMZEM2 = %d      phe     ADCZEM2 = %d ADCch",PMZEM2,digit);
  PedValue = AddPedestal();
  digit += PedValue;
//  printf("  PedValue = %d\n",PedValue);
  ZDC->AddDigit(sector, digit); 
}

//_____________________________________________________________________________
Int_t AliZDCMerger::Phe2ADCch(Int_t Det, Int_t Quad, Int_t Light)
{
  // Evaluation of the ADC channel corresponding to the light yield Light

  if(gAlice->GetDebug() > 0){
//    printf("\n  Phe2ADCch -> Detector = %d, Quadrant = %d, Light = %d\n", Det, Quad, Light);
  }
  
  Int_t ADCch = 0;
  // Parameters for conversion of light yield in ADC channels
  Float_t fPMGain[3][5];      // PM gain
  Float_t fADCRes;            // ADC conversion factor
  
  Int_t j,i;
  for(i=0; i<3; i++){
     for(j=0; j<5; j++){
        fPMGain[i][j]   = 100000.;
     }
  }
  fADCRes   = 0.00000064; // ADC Resolution: 250 fC/ADCch
  
  ADCch = (Int_t) (Light*fPMGain[Det-1][Quad]*fADCRes);
     
  return ADCch;
}

//_____________________________________________________________________________
Int_t AliZDCMerger::AddPedestal()
{
  // --- Pedestal value -> extracted from a gaussian distribution
  // obtained from the beam test on the ZEM prototype (Aug. 2000)
  
  Int_t PedValue;
  Float_t PedMean  = 50.;
  Float_t PedWidth = 10.;
  
  PedValue    = (Int_t) gRandom->Gaus(PedMean,PedWidth);
  
  return PedValue;
}
Commit	Line	Data
359cdddc	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
	17	///////////////////////////////////////////////////////////////////////////////
	18	// //
	19	// ZDC event merging class //
	20	// //
	21	///////////////////////////////////////////////////////////////////////////////
	22
	23	// --- ROOT system
	24	#include <iostream.h>
	25	#include <TTree.h>
	26	#include <TFile.h>
	27	#include <TDirectory.h>
1acbaaa8	28	#include <TNtuple.h>
53c30603	29	#include <TSystem.h>
359cdddc	30
	31	// --- AliRoot header files
	32	#include "AliZDCMerger.h"
	33	#include "AliZDC.h"
	34	#include "AliZDCHit.h"
1acbaaa8	35	#include "AliZDCMergedHit.h"
359cdddc	36	#include "AliZDCDigit.h"
	37	#include "AliZDCFragment.h"
	38	#include "AliRun.h"
	39	#include "AliDetector.h"
	40	#include "AliHeader.h"
	41	#include "AliGenEventHeader.h"
53c30603	42	#include "AliGenHijingEventHeader.h"
359cdddc	43
	44	ClassImp(AliZDCMerger)
	45
	46	//____________________________________________________________________________
	47	AliZDCMerger::AliZDCMerger()
	48	{
	49	// Default constructor
	50	fMerge = kDigitize;
1acbaaa8	51	// fMerge = kMerge;
359cdddc	52	fFnBgr = 0;
359cdddc	53	fBgrFile = 0;
1acbaaa8	54	fNEvBgr = 0;
359cdddc	55	fTrHBgr = 0;
	56	fTrSDBgr = 0;
	57	fImpPar = 0;
	58	fSpecn = 0;
	59	fSpecp = 0;
	60	fFreeSpn = 0;
	61	fFreeSpp = 0;
	62	fFnSpecn = 0;
359cdddc	63	fSpecnFile = 0;
359cdddc	64	fFnSpecp = 0;
359cdddc	65	fSpecpFile = 0;
1acbaaa8	66	fNMhits = 0;
1acbaaa8	67
359cdddc	68	}
	69
	70	//____________________________________________________________________________
	71	AliZDCMerger::~AliZDCMerger()
	72	{
	73	// Destructor
	74	if (fBgrFile) delete fBgrFile;
	75	if (fTrHBgr) delete fTrHBgr;
	76	if (fTrSDBgr) delete fTrSDBgr;
	77	if (fHitsBgr) delete fHitsBgr;
	78	if (fSpecnFile) delete fSpecnFile;
	79	if (fSpecpFile) delete fSpecpFile;
	80	}
	81
	82	//____________________________________________________________________________
	83	void AliZDCMerger::InitMerging()
	84	{
	85	// Hits tree, impact parameter, num. of spectators n & p
	86	// in background (full Hijing) event
	87	Float_t b;
	88	Int_t nspecn, nspecp;
	89	Background(b, nspecn, nspecp);
	90
	91	// Production of nuclear fragments -> num. of FREE spectators n & p
	92	Fragmentation(b, nspecn, nspecp, fFreeSpn, fFreeSpp);
	93
	94	// Extract from spectators distribution the signal events:
	95	// NFreeSpectatorN spectator n & NFreeSpectatorP spectator p
1acbaaa8	96	Mixing();
359cdddc	97	}
	98
	99	//____________________________________________________________________________
	100	void AliZDCMerger::Background(Float_t &fImpPar, Int_t &fSpecn, Int_t &fSpecp)
	101	{
	102
	103	// --- Open the background file
	104	if (fMerge && !fBgrFile) fBgrFile = OpenBgrFile();
	105
	106	// --- Read from the TreeE impact parameter (b),
	107	// # of spectators n and p (fSpecn, fSpecp)
	108	fBgrFile->cd();
	109
1acbaaa8	110	// // Get AliRun object from file or create it if not on file
359cdddc	111	// gAlice = (AliRun*)fBgrFile->Get("gAlice");
1acbaaa8	112	// if (!gAlice) {
	113	// gAlice = (AliRun*)fBgrFile->Get("gAlice");
	114	// if (gAlice) printf("AliRun object found on file\n");
	115	// if (!gAlice) {
	116	// printf("\n create new gAlice object");
	117	// gAlice = new AliRun("gAlice","Alice test program");
	118	// }
	119	// }
	120
359cdddc	121	AliHeader *header = gAlice->GetHeader();
	122	AliGenEventHeader* mcHeader = header->GenEventHeader();
	123	fImpPar = ((AliGenHijingEventHeader*) mcHeader)->ImpactParameter();
	124	fSpecn = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsn();
	125	fSpecp = ((AliGenHijingEventHeader*) mcHeader)->Spectatorsp();
1acbaaa8	126	printf("\n HIJING simulation - b = %f fm, Nspecn = %d, Nspecp = %d\n",fImpPar,fSpecn,fSpecp);
359cdddc	127	}
	128
	129	//____________________________________________________________________________
	130	TFile* AliZDCMerger::OpenBgrFile()
	131	{
	132	// Initialise background event
	133	TFile *file = new TFile(fFnBgr,"UPDATE");
1acbaaa8	134	printf("\n AliZDCMerger --- Background event -> %s file opened \n", fFnBgr);
359cdddc	135	fHitsBgr = new TClonesArray("AliZDCHit",1000);
1acbaaa8	136	fMHits = new TClonesArray("AliZDCMergedHit",1000);
359cdddc	137	return file;
	138	}
	139
	140	//____________________________________________________________________________
	141	void AliZDCMerger::Fragmentation(Float_t fImpPar, Int_t fSpecn, Int_t fSpecp,
	142	Int_t &fFreeSpn, Int_t &fFreeSpp)
	143	{
	144	Int_t j, zz[100], nn[100], nAlpha, Ztot, Ntot;
	145	AliZDCFragment *frag = new AliZDCFragment(fImpPar);
	146	for(j=0; j<=99; j++){
	147	zz[j] =0;
	148	nn[j] =0;
	149	}
	150
	151	// Fragments generation
	152	frag->GenerateIMF(zz, nAlpha);
	153
	154	// Attach neutrons
	155	Ztot=0;
	156	Ntot=0;
	157	frag->AttachNeutrons(zz, nn, Ztot, Ntot);
	158	fFreeSpn = fSpecn-Ztot-2*nAlpha;
	159	fFreeSpp = fSpecp-Ntot-2*nAlpha;
1acbaaa8	160	printf("\n Fragmentation -> FreeSpn = %d, FreeSpp = %d\n",fFreeSpn,fFreeSpp);
359cdddc	161	}
	162
	163	//____________________________________________________________________________
1acbaaa8	164	void AliZDCMerger::Mixing()
359cdddc	165	{
1acbaaa8	166
	167	// printf("\n AliZDCMerger->Mixing\n");
	168
359cdddc	169	// ### Background event Hits ###########################################
	170	fBgrFile->cd();
	171	// fBgrFile->ls();
	172
1acbaaa8	173	AliZDC ZDC = (AliZDC )gAlice->GetModule("ZDC");
359cdddc	174	// if(ZDC) printf("\n Ho trovato lo ZDC!\n");
	175
	176	// Hits tree
	177	if(fTrHBgr) delete fTrHBgr;
1acbaaa8	178	fTrHBgr = 0;
359cdddc	179	// SDigits tree
	180	if(fTrSDBgr) delete fTrSDBgr;
	181	fTrSDBgr = 0;
	182
1acbaaa8	183	// fNEvBgr = 0; // Let's suppose to have 1 full Hijing event per file
359cdddc	184
1acbaaa8	185	// Hits tree
359cdddc	186	char treeBgrName[20];
359cdddc	187	sprintf(treeBgrName,"TreeH%d",fNEvBgr);
1acbaaa8	188	fTrHBgr = (TTree*)gDirectory->Get(treeBgrName);
359cdddc	189	if(!fTrHBgr){
	190	printf("\n ERROR -> Can't find TreeH%d in background file\n",fNEvBgr);
	191	}
1acbaaa8	192	// fTrHBgr->Print();
	193
	194	// Branch address
	195	TBranch *branch;
	196	char branchname[20];
	197	sprintf(branchname,"%s",ZDC->GetName());
	198	if(fTrHBgr && fHitsBgr){
	199	// printf("\n fTrHBgr!=0 && fHitsBgr!=0\n");
	200	branch = fTrHBgr->GetBranch(branchname);
	201	if(branch) branch->SetAddress(&fHitsBgr);
	202	}
	203
359cdddc	204	Int_t ntracks = (Int_t) fTrHBgr->GetEntries();
1acbaaa8	205	// printf("\n --- ntracks = %d\n\n", ntracks);
	206
	207	Int_t itrack, nhits, ihit, j, sector[2];
	208	AliZDCHit* zdcHit;
	209	AliZDCMergedHit *MHit;
	210	Float_t MHits[7];
	211	TClonesArray &sdigits = *fMHits; // SDigits TCArray
	212	fNMhits = 0;
359cdddc	213
359cdddc	214	// --- Tracks loop
359cdddc	215	for(itrack=0; itrack<ntracks; itrack++){
1acbaaa8	216	// printf(" itrack = %d", itrack);
1acbaaa8	217	// gAlice->ResetHits();
359cdddc	218	fTrHBgr->GetEvent(itrack);
359cdddc	219
1acbaaa8	220	// for(AliZDCHit* zdcHit=(AliZDCHit*)ZDC->FirstHit(-1);
	221	// zdcHit;
	222	// zdcHit = (AliZDCHit*)ZDC->NextHit()){
	223
	224	nhits = fHitsBgr->GetEntries();
	225	// nhits = ZDCdp->GetNhits();
	226	// printf(" nhits = %d \n", nhits);
	227	for(ihit=0; ihit<nhits; ihit++){
	228	zdcHit = (AliZDCHit*) fHitsBgr->UncheckedAt(ihit);
	229
	230	for(j=0; j<2; j++) sector[j] = zdcHit->GetVolume(j);
	231	MHits[0] = zdcHit->GetPrimKinEn();
	232	MHits[1] = zdcHit->GetXImpact();
	233	MHits[2] = zdcHit->GetYImpact();
	234	MHits[3] = zdcHit->GetSFlag();
	235	MHits[4] = zdcHit->GetLightPMQ();
	236	MHits[5] = zdcHit->GetLightPMC();
	237	MHits[6] = zdcHit->GetEnergy();
	238	MHit = new AliZDCMergedHit(sector, MHits);
	239	// MHit->Print("");
	240	new((fMHits)[fNMhits]) AliZDCMergedHit(MHit);
	241	new (sdigits[fNMhits]) AliZDCMergedHit(*MHit);
	242	delete MHit;
	243	fNMhits++;
	244	}//Hits loop
	245
359cdddc	246	} // Tracks loop
1acbaaa8	247	// printf("\n fNMhits (after bckg) = %d, \n",fNMhits);
	248	// fMHits->Dump();
	249	// AliZDCMergedHit pippo7 = (AliZDCMergedHit) fMHits->At(7);
	250	// pippo7->Dump();
	251
	252
	253	// ### Signal event Hits ###########################################
	254	// --- Neutrons
	255	ExtractSignal(1);
359cdddc	256
1acbaaa8	257	// --- Protons
	258	ExtractSignal(2);
	259	// printf("\n fNMhits (after signal) = %d \n",fNMhits);
359cdddc	260
	261	}
	262
	263	//____________________________________________________________________________
1acbaaa8	264	void AliZDCMerger::ExtractSignal(Int_t SpecType)
359cdddc	265	{
359cdddc	266
1acbaaa8	267	// printf("\n Entering in Extract Signal\n");
	268
	269	Int_t NumEvents = 0;
	270	if(SpecType == 1){ // --- Signal for spectator neutrons
	271	fFnSpecn = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZNsignalntu.root");
	272	fSpecnFile = TFile::Open(fFnSpecn,"R");
	273	fSpecnFile->cd();
	274	// printf("\n --- ExtractSignal x n: file %s opened\n", fFnSpecn);
	275	NumEvents = fFreeSpn;
	276	}
	277	else if(SpecType == 2){ // --- Signal for spectator protons
	278	fFnSpecp = gSystem->ExpandPathName("$ALICE/$ALICE_LEVEL/ZDC/ZPsignalntu.root");
	279	fSpecpFile = TFile::Open(fFnSpecp,"R");
	280	fSpecpFile->cd();
	281	// printf("\n --- ExtractSignal x p: file %s opened\n", fFnSpecp);
	282	NumEvents = fFreeSpp;
	283	}
	284	// printf("\n # of free spectator = %d\n", NumEvents);
	285	// printf("\n fNMhits (before adding signal) = %d\n",fNMhits);
	286
	287	TNtuple ZDCSignal = (TNtuple) gDirectory->Get("ZDCSignal");
	288	Int_t nentries = (Int_t) ZDCSignal->GetEntries();
	289	// printf("\n # entries = %d\n", nentries);
	290	Int_t i, j, k;
	291
	292	AliZDCMergedHit *MHit;
	293	Float_t *entry, HitsSpec[7];
	294	Int_t iev, rnd, Volume[2];
	295	for(iev=0; iev<NumEvents; iev++){
	296	rnd = (Int_t) (1000*gRandom->Rndm());
	297	// printf("\n rnd = %d\n", rnd);
	298	for(i=0; i<nentries; i++){
	299	ZDCSignal->GetEvent(i);
	300	entry = ZDCSignal->GetArgs();
	301	if(entry[0] == rnd){
	302	// printf("\n entry[0] = %f\n", entry[0]);
	303	for(k=0; k<2; k++) Volume[k] = (Int_t) entry[k+1];
	304	for(j=0; j<7; j++){
	305	HitsSpec[j] = entry[j+3];
	306	}
	307	MHit = new AliZDCMergedHit(Volume, HitsSpec);
	308	new((fMHits)[fNMhits++]) AliZDCMergedHit(MHit);
	309	delete MHit;
	310	}
	311	else if(entry[0] > rnd) break;
	312	}
	313	}
	314
	315	if(SpecType ==1){
	316	// printf("\n fNMhits (after n signal) = %d\n",fNMhits);
	317	fSpecnFile->Close();
	318	}
	319	else if(SpecType == 2){
	320	// printf("\n fNMhits (after p signal) = %d\n",fNMhits);
	321	fSpecpFile->Close();
	322	}
	323
359cdddc	324	}
	325
	326	//____________________________________________________________________________
1acbaaa8	327	void AliZDCMerger::Digitize(Int_t fNMhits, TClonesArray *fMHits)
359cdddc	328	{
	329
	330	// printf("\n AliZDCMerger->Digitize()");
	331
	332	AliZDC ZDC = (AliZDC )gAlice->GetModule("ZDC");
	333	// if(ZDC) printf("\n Ho trovato lo ZDC!\n");
	334
1acbaaa8	335	Int_t lightQ, lightC, sector[2], digit;
1acbaaa8	336	Int_t PMCZN = 0, PMCZP = 0, PMQZN[4], PMQZP[4], PMZEM1 = 0, PMZEM2 = 0;
359cdddc	337	Int_t i;
	338	for(i=0; i<4; i++){
	339	PMQZN[i] = 0;
	340	PMQZP[i] = 0;
	341	}
1acbaaa8	342
	343	AliZDCMergedHit *MHit;
	344	Int_t imhit;
	345	// printf("\n fNMHits = %d\n", fNMhits);
	346	// Loop over SDigits
	347	for(imhit=0; imhit<fNMhits; imhit++){
	348
	349	MHit = (AliZDCMergedHit*) fMHits->UncheckedAt(imhit);
	350	sector[0] = MHit->GetSector(0);
	351	sector[1] = MHit->GetSector(1);
	352	if((sector[1]!=1) && (sector[1]!=2) && (sector[1]!=3) && (sector[1]!=4)){
	353	// printf("\n *** ERROR!!! sector[0] = %d, sector[1] = %d\n",
	354	// sector[0], sector[1]);
	355	sector[1] = 0;
	356	}
	357	lightQ = Int_t(MHit->GetLightPMQ());
	358	lightC = Int_t(MHit->GetLightPMC());
	359	// printf("\n imhit = %d -> DET. = %d, quad = %d,PMQ = %d, PMC = %d",
	360	// imhit,sector[0], sector[1],lightQ, lightC);
	361
	362	if(sector[0] == 1){ //ZN
	363	PMCZN = PMCZN + lightC;
	364	PMQZN[sector[1]-1] = PMQZN[sector[1]-1] + lightQ;
	365	}
	366	else if(sector[0] == 2){ //ZP
	367	PMCZP = PMCZP + lightC;
	368	PMQZP[sector[1]-1] = PMQZP[sector[1]-1] + lightQ;
	369	}
	370	else if(sector[0] == 3){ //ZEM
	371	if(sector[1] ==1) PMZEM1 = PMZEM1 + lightC;
	372	else PMZEM2 = PMZEM2 + lightQ;
	373	}
	374	} // SDigits loop
359cdddc	375
1acbaaa8	376	// ### Digits creation ###############################################
359cdddc	377	// Create digits for ZN
	378	Int_t PedValue;
	379	sector[0] = 1; // Detector = ZN
	380	sector[1] = 0; // Common PM ADC
	381	digit = Phe2ADCch(1, 0, PMCZN);
	382	// printf("\n\n ZN ### PMCZN = %d ADCZN = %d",PMCZN, digit);
1acbaaa8	383	PedValue = AddPedestal();
	384	digit += PedValue;
	385	// printf(" PedValue = %d",PedValue);
359cdddc	386	ZDC->AddDigit(sector, digit);
	387	Int_t j;
	388	for(j=0; j<4; j++){
	389	sector[1] = j+1; // Towers PM ADCs
	390	digit = Phe2ADCch(1, j+1, PMQZN[j]);
1acbaaa8	391	// printf("\n PMQZN[%d] = %d phe ADCZN[%d] = %d ADCch",j,PMQZN[j],j,digit);
359cdddc	392	PedValue = AddPedestal();
	393	digit += PedValue;
	394	// printf(" PedValue = %d",PedValue);
	395	ZDC->AddDigit(sector, digit);
	396	}
1acbaaa8	397	// printf("\n");
359cdddc	398
	399	// Create digits for ZP
	400	sector[0] = 2; // Detector = ZP
	401	sector[1] = 0; // Common PM ADC
	402	digit = Phe2ADCch(2, 0, PMCZP);
1acbaaa8	403	// printf("\n ZP --- PMCZP = %d phe ADCZP = %d ADCch",PMCZP,digit);
	404	PedValue = AddPedestal();
	405	digit += PedValue;
	406	printf(" PedValue = %d",PedValue);
359cdddc	407	ZDC->AddDigit(sector, digit);
	408	for(j=0; j<4; j++){
	409	sector[1] = j+1; // Towers PM ADCs
	410	digit = Phe2ADCch(2, j+1, PMQZP[j]);
1acbaaa8	411	// printf("\n PMQZP[%d] = %d phe ADCZP[%d] = %d ADCch",j,PMQZP[j],j,digit);
359cdddc	412	PedValue = AddPedestal();
	413	digit += PedValue;
	414	// printf(" PedValue = %d",PedValue);
	415	ZDC->AddDigit(sector, digit);
	416	}
1acbaaa8	417	// printf("\n");
359cdddc	418
359cdddc	419	// Create digits for ZEM
1acbaaa8	420	sector[0] = 3;
	421	sector[1] = 1; // Detector = ZEM1
	422	digit = Phe2ADCch(3, 1, PMZEM1);
	423	// printf("\n ZEM *** PMZEM1 = %d phe ADCZEM1 = %d ADCch",PMZEM1,digit);
	424	PedValue = AddPedestal();
	425	digit += PedValue;
	426	// printf(" PedValue = %d\n",PedValue);
	427	ZDC->AddDigit(sector, digit);
	428	sector[1] = 2; // Detector = ZEM2
	429	digit = Phe2ADCch(3, 2, PMZEM2);
	430	// printf("\n ZEM *** PMZEM2 = %d phe ADCZEM2 = %d ADCch",PMZEM2,digit);
	431	PedValue = AddPedestal();
	432	digit += PedValue;
	433	// printf(" PedValue = %d\n",PedValue);
359cdddc	434	ZDC->AddDigit(sector, digit);
359cdddc	435	}
	436
	437	//_____________________________________________________________________________
	438	Int_t AliZDCMerger::Phe2ADCch(Int_t Det, Int_t Quad, Int_t Light)
	439	{
	440	// Evaluation of the ADC channel corresponding to the light yield Light
	441
	442	if(gAlice->GetDebug() > 0){
	443	// printf("\n Phe2ADCch -> Detector = %d, Quadrant = %d, Light = %d\n", Det, Quad, Light);
	444	}
	445
	446	Int_t ADCch = 0;
	447	// Parameters for conversion of light yield in ADC channels
	448	Float_t fPMGain[3][5]; // PM gain
	449	Float_t fADCRes; // ADC conversion factor
	450
	451	Int_t j,i;
	452	for(i=0; i<3; i++){
	453	for(j=0; j<5; j++){
	454	fPMGain[i][j] = 100000.;
	455	}
	456	}
	457	fADCRes = 0.00000064; // ADC Resolution: 250 fC/ADCch
	458
	459	ADCch = (Int_t) (LightfPMGain[Det-1][Quad]fADCRes);
	460
	461	return ADCch;
	462	}
	463
	464	//_____________________________________________________________________________
	465	Int_t AliZDCMerger::AddPedestal()
	466	{
	467	// --- Pedestal value -> extracted from a gaussian distribution
	468	// obtained from the beam test on the ZEM prototype (Aug. 2000)
	469
	470	Int_t PedValue;
	471	Float_t PedMean = 50.;
	472	Float_t PedWidth = 10.;
	473
	474	PedValue = (Int_t) gRandom->Gaus(PedMean,PedWidth);
	475
	476	return PedValue;
	477	}