/**************************************************************************
 * 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.                  *
 **************************************************************************/

/* $Id$ */

//////////////////////////////////////////////////////////////////////
//                                                                  //
//  (V-zero) detector  version 2  as designed by the Lyon group     //
//   All comments should be sent to Brigitte CHEYNIS :              //
//                                  b.cheynis@ipnl.in2p3.fr         // 
//   Geometry of the  26th of november 2003                         //
//  (circular instead of trapezoidal shapes as in previous versions //
//   plus changes in cell dimensions and offsets) :                 // 
//   Scintillating cells are now 2 cm thick instead of 0.7 cm       //
//   V0R sits between Z values  -89.4 and  -85.0 cm                 //
//   V0L sits between Z values +350.0 and +352.0 cm                 //
//   New coordinate system has been implemented in october 2003     //
//                                                                  //
//////////////////////////////////////////////////////////////////////

// --- Standard libraries ---
#include <Riostream.h>
#include <stdlib.h>
#include <string.h>

// --- ROOT libraries ---
#include <TClonesArray.h>
#include <TGeoGlobalMagField.h>
#include <TLorentzVector.h>
#include <TMath.h>
#include <TObjectTable.h>
#include <TParticle.h>
#include <TVirtualMC.h>

// --- AliRoot header files ---
#include "AliRun.h"
#include "AliMC.h"
#include "AliConst.h"
#include "AliLog.h"
#include "AliMagF.h"
#include "AliVZEROLoader.h"
#include "AliVZEROdigit.h"
#include "AliVZEROhit.h"
#include "AliVZEROv2.h"

ClassImp(AliVZEROv2)

//_____________________________________________________________________________
AliVZEROv2:: AliVZEROv2():AliVZERO()
{
// Standard default constructor 
}

//_____________________________________________________________________________
AliVZEROv2::AliVZEROv2(const char *name, const char *title):
 AliVZERO(name,title)
{

// Standard constructor for V-zero Detector  version 2

  AliDebug(2,"Create VZERO object");
  
}

//_____________________________________________________________________________
void AliVZEROv2::CreateGeometry()
{

// Creates the GEANT geometry of the V-zero Detector  version 2
  
  AliDebug(2,"Create VZERO Geometry");
      
  Int_t    *idtmed = fIdtmed->GetArray()-2999;

  Int_t    ndetR = 1;
  Int_t    ndetL = 1;
 
  Int_t    ncellsR = 1;
  Int_t    ncellsL = 1;
  
  Int_t    idrotm[999];
 
  Float_t  height1, height2, height3, height4, height5; 
  Float_t  height;
  Float_t  theta;  
  
  Float_t  halfThickQua;
  
  Float_t  zdet;
  Float_t  r0, r5;
  Float_t  pi = TMath::Pi();
    
  height1     =     1.82;         // height of cell 1, in cm
  height2     =     3.81;         // height of cell 2, in cm
  height3     =     4.72;         // height of cell 3, in cm
  height4     =     7.12;         // height of cell 4, in cm
  height5     =    10.83;         // height of cell 5, in cm
  
  theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
    
  halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
  
// distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from 
// absorber nose sitting at 90 cm. Will use -zdet later...
   
  zdet        =    90.0 - 0.6 -fThickness/2.0;  // distance to vertex (along Z axis)   
  r0          =    4.05;          // closest distance to center of the beam pipe
  height      =    height1 + height2 + height3 + height4 + height5;
  r5          =    r0 + height;

// Creation of mother volume v0LE - left part - :
// Entrance face at  +350.0 cm  (new coordinate system) ...

   Float_t   partube[3];
   
   partube[0] =  4.3;
   partube[1] = 45.0;
   partube[2] = fThickness1/2.0;   
    
   gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
     
// Creation of five rings - left part - :
// Entrance face at +350.0 cm  (new coordinate system) ... 

// Mother volume v0L0 in which will be set 5 scintillator cells 

  Float_t   partubs[5];  
    
  Float_t   r0Left      =   4.3;   
  Float_t   height1Left =   2.6; 
  Float_t   height2Left =   4.1;
  Float_t   height3Left =   6.4;
  Float_t   height4Left =  10.2;
  Float_t   height5Left =  16.9;
  Float_t   heightLeft  = height1Left + height2Left + height3Left 
                                      + height4Left + height5Left;
  Float_t   r5Left      = r0Left  + heightLeft; 
  
  partubs[0]      =  r0Left;
  partubs[1]      =  r5Left;
  partubs[2]      =  fThickness1/2.0;
  partubs[3]      =  90.0-15.0;
  partubs[4]      = 120.0-15.0;

  gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
  
  Float_t  r1Left =  r0Left + height1Left;        
     
  partubs[0]     =  r0Left;
  partubs[1]     =  r1Left;

  gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 

  Float_t   r2Left  =   r1Left + height2Left;       
  
  partubs[0]     =  r1Left;
  partubs[1]     =  r2Left;

  gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY"); 
  
  Float_t   r3Left =   r2Left + height3Left;
   
  partubs[0]     =  r2Left;
  partubs[1]     =  r3Left;

  gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
  
  Float_t   r4Left =  r3Left + height4Left;
   
  partubs[0]     =  r3Left;
  partubs[1]     =  r4Left;

  gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");

  partubs[0]     =  r4Left;
  partubs[1]     =  r5Left;
  partubs[3]     =  90.0-15.0;
  partubs[4]     = 120.0-30.0;
  
  gMC->Gsvolu("V0L5","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L5",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
  
  partubs[3]     = 120.0-30.0;
  partubs[4]     = 120.0-15.0;
  
  gMC->Gsvolu("V0L6","TUBS",idtmed[3005],partubs,5);  // quartz volume
  gMC->Gspos("V0L6",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
  

// Creation of mother volume v0RI - right part - :
  
  partube[0] = r0 - 0.2;
  partube[1] = r5 + 1.0;
  partube[2] = fThickness/2.0; 
      
  gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
  
// Creation of  carbon lids (2 mm thick) to keep v0RI box shut...

  Float_t  lidThickness = 0.2;
 
  partube[0] =   r0;
  partube[1] =   r5;
  partube[2] =   +lidThickness/2.0;
    
  gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3); 
  gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
  gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
  
// Creation of aluminum rings to maintain the v0RI pieces ...

  partube[0] =   r0 - 0.2;
  partube[1] =   r0;
  partube[2] =   +fThickness/2.0;
   
  gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);    
  gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");

  partube[0] =   r5;
  partube[1] =   r5 + 1.0;
  partube[2] =   +fThickness/2.0;
 
  gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);    
  gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
  
// Mother volume v0R0 in which will be set 5  scintillator cells 
  
  partubs[0]      =  r0;
  partubs[1]      =  r5;
  partubs[2]      =  fThickness/2.0;
  partubs[3]      =  90.0-15.0;
  partubs[4]      = 120.0-15.0;

  gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume 

// Elementary cell of ring 1 :
// (cells 2 and 3  will be shifted by 1 cm to output fibers) 
   
  Float_t   offsetFibers  =  1.0;
  Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0; 
  Float_t   r1            =  r0 + height1;
      
  partubs[0]     =  r0;
  partubs[1]     =  r1;
  partubs[2]     =  fThickness1/2.0;
  
  gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY"); 

// Elementary cell of ring 2 :

  Float_t   r2   =  r1 + height2;       
  
  partubs[0]     =  r1;
  partubs[1]     =  r2;

  gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY"); 


// Elementary cell of ring 3 :
  
  Float_t   r3   =  r2 + height3;
   
  partubs[0]     =  r2;
  partubs[1]     =  r3;

  gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");

// Elementary cell of ring 4 :
  
  Float_t   r4   =  r3 + height4 ;
  
  partubs[0]     =  r3;
  partubs[1]     =  r4;

  gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 ,  -offset + 2.0 * offsetFibers, 0,"ONLY");

// Elementary cells of ring 5 :

  partubs[0]     =  r4;
  partubs[1]     =  r5;
  partubs[3]     =  90.0-15.0;
  partubs[4]     = 120.0-30.0;
  
  gMC->Gsvolu("V0R5","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R5",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");  

  partubs[3]     = 120.0-30.0;
  partubs[4]     = 120.0-15.0;
  
  gMC->Gsvolu("V0R6","TUBS",idtmed[3005],partubs,5);  // scintillator volume
  gMC->Gspos("V0R6",1,"V0R0", 0.0, 0.0 ,  -offset + 2.0 * offsetFibers, 0,"ONLY");
   
  Float_t  phiDeg = 180./6.; 

// Right part : 
 
  for(Float_t  phi = 15.0; phi < 360.0; phi = phi + phiDeg)
      {        
      	AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
        gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
	                  0.0,0.0,idrotm[902],"ONLY");
	ndetR++;
       }

  gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
 
  ncellsR = (ndetR - 1) * 6;  
  AliInfo(Form("Number of cells on Right side =   %d",  ncellsR));    

// Left part :

  for(Float_t  phi = 15.0; phi < 360.0; phi = phi + phiDeg)
      {       
      	AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
        gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
	                  0.0,0.0,idrotm[902],"ONLY");
        ndetL++;
       }

  gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
 
  ncellsL = (ndetL - 1) * 6;
  AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));    
           
}            
    
//_____________________________________________________________________________
void AliVZEROv2::CreateMaterials()
{

// Creates materials used for geometry 

    AliDebug(2,"VZERO create materials");
    
/*
    Float_t ppckov[14] = { 5.5e-9, 5.7e-9, 5.9e-9, 6.1e-9, 6.3e-9, 6.5e-9, 6.7e-9, 
                           6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };

           
    Float_t ppckov_alu[14] = { 5.5e-9, 5.7e-9, 5.9e-9, 6.1e-9, 6.3e-9, 6.5e-9, 6.7e-9, 
                               6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
			   
    Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458, 
                                 1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362, 
                                 1.662295, 1.68337 };
				 
    Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525, 
                                14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 }; 	
				  							
    Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
    
        
    Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. }; 
    
    
    Float_t absco_alu[14]  = { 1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,1e-4,
			       1e-4,1e-4,1e-4,1e-4 };
    Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };

*/	  

    Int_t *idtmed = fIdtmed->GetArray()-2999;
    
    
//  Parameters related to Quarz (SiO2) :
 
    Float_t aqua[2], zqua[2], densqua, wmatqua[2];
    Int_t nlmatqua;
    
    aqua[0]    = 28.09;
    aqua[1]    = 16.;
    zqua[0]    = 14.;
    zqua[1]    = 8.;
    densqua    = 2.64;
    nlmatqua   = -2;
    wmatqua[0] = 1.;
    wmatqua[1] = 2.;

// Parameters  related to aluminum sheets :
    
    Float_t  aal   = 26.98;
    Float_t  zal   = 13.00; 
    Float_t  densal=   2.7; 
    Float_t  radlal=   8.9;
       
// Parameters  related to scintillator CH :
    
    Float_t ascin[2] = {1.00794,12.011};
    Float_t zscin[2] = {1.,6.};
    Float_t wscin[2] = {1.,1.};
    Float_t denscin  = 1.032;

// AIR

    Float_t aAir[4]={12.,14.,16.,36.};
    Float_t zAir[4]={6.,7.,8.,18.};
    Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
    Float_t dAir = 1.20479E-3;
        
//  Definition of materials :
       
    AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
    AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
    AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
    AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
    AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
    AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
 
    AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
    
     
    Int_t   iSXFLD = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();     // Field type  
    Float_t sXMGMX = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();       // Field max.
    
    Float_t tmaxfd, stemax, deemax, epsil, stmin;
        
    tmaxfd = 10.;
    stemax = 0.1;
    deemax = 0.1;     
    epsil  = 0.001;
    stmin  = 0.001;
  
//  Active Air :    
    AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
              10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;

//  Inactive air : 
  
    AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
              10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
    
    AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
              tmaxfd, stemax, deemax, epsil, stmin, 0, 0);   

    AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
              tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
    
    AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
              tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
	      

    AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
              tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);    

    AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);

    gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
    gMC->Gstpar(idtmed[3000], "HADR", 1.);
    gMC->Gstpar(idtmed[3000], "DCAY", 1.);
    gMC->Gstpar(idtmed[3000], "DRAY", 1.);
    
    gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
    gMC->Gstpar(idtmed[3001], "HADR", 1.);
    gMC->Gstpar(idtmed[3001], "DCAY", 1.);
    gMC->Gstpar(idtmed[3001], "DRAY", 1.);

    gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
    gMC->Gstpar(idtmed[3002], "HADR", 1.);
    gMC->Gstpar(idtmed[3002], "DCAY", 1.);
    gMC->Gstpar(idtmed[3002], "DRAY", 1.);  
    gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ; 
    gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
    
    gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
    gMC->Gstpar(idtmed[3003], "HADR", 1.);
    gMC->Gstpar(idtmed[3003], "DCAY", 1.);
    gMC->Gstpar(idtmed[3003], "DRAY", 1.);
    
    gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
    gMC->Gstpar(idtmed[3004], "HADR", 1.);
    gMC->Gstpar(idtmed[3004], "DCAY", 1.);
    gMC->Gstpar(idtmed[3004], "DRAY", 1.);
    gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ; 
    gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
    
    gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
    gMC->Gstpar(idtmed[3005], "HADR", 1.);
    gMC->Gstpar(idtmed[3005], "DCAY", 1.);
    gMC->Gstpar(idtmed[3005], "DRAY", 1.); 
    gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ; 
    gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
      
    
//    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
//    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);

//    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);    
//    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
                                       
}

//_____________________________________________________________________________
void AliVZEROv2::DrawModule() const
{

//  Drawing is done in DrawVZERO.C

   AliDebug(2,"VZERO DrawModule");

}

//_____________________________________________________________________________
void AliVZEROv2::Init()
{
// Initialises version 2 of the VZERO Detector
// Just prints an information message
  
   AliInfo(Form("VZERO version %d initialized",IsVersion()));
   
//   gMC->SetMaxStep(fMaxStepAlu);
//   gMC->SetMaxStep(fMaxStepQua);
   
    AliVZERO::Init();
  
}


//_____________________________________________________________________________
void AliVZEROv2::StepManager()
{
 
// Step Manager, called at each step 
   
     Int_t     copy;
     static    Int_t   vol[4];
     static    Float_t hits[19];
     static    Float_t eloss, tlength;
     
     TLorentzVector pos;     
     TLorentzVector mom;
     
     Float_t        theta;
     Float_t        phi;
     Float_t        ringNumber;

     Int_t          ipart;
     Float_t        destep, step;
          

//   We keep only charged tracks :
     
     if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return; 


     vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
     vol[2]    = gMC->CurrentVolID(copy);
     vol[3]    = copy;
     
     static Int_t idV0R1 = gMC->VolId("V0R1");
     static Int_t idV0L1 = gMC->VolId("V0L1");
     static Int_t idV0R2 = gMC->VolId("V0R2");
     static Int_t idV0L2 = gMC->VolId("V0L2");
     static Int_t idV0R3 = gMC->VolId("V0R3");
     static Int_t idV0L3 = gMC->VolId("V0L3");
     static Int_t idV0R4 = gMC->VolId("V0R4");
     static Int_t idV0L4 = gMC->VolId("V0L4");
     static Int_t idV0R5 = gMC->VolId("V0R5");
     static Int_t idV0L5 = gMC->VolId("V0L5");
     static Int_t idV0R6 = gMC->VolId("V0R6");
     static Int_t idV0L6 = gMC->VolId("V0L6");

     if      ( gMC->CurrentVolID(copy) == idV0R1 ||
               gMC->CurrentVolID(copy) == idV0L1 )
	       ringNumber = 1.0;
     else if ( gMC->CurrentVolID(copy) == idV0R2 ||
               gMC->CurrentVolID(copy) == idV0L2 ) 
	       ringNumber = 2.0;  
     else if ( gMC->CurrentVolID(copy) == idV0R3 ||
               gMC->CurrentVolID(copy) == idV0L3 )
	       ringNumber = 3.0;
     else if ( gMC->CurrentVolID(copy) == idV0R4 ||
               gMC->CurrentVolID(copy) == idV0L4 ) 	 
	       ringNumber = 4.0; 
     else if ( gMC->CurrentVolID(copy) == idV0R5 ||
               gMC->CurrentVolID(copy) == idV0L5 ||
	       gMC->CurrentVolID(copy) == idV0R6 ||
	       gMC->CurrentVolID(copy) == idV0L6 )	  
               ringNumber = 5.0; 
     else
     	       ringNumber = 0.0;

     if  (  ringNumber > 0.5  ) { 
     
        destep    = gMC->Edep();
	step      = gMC->TrackStep();
        eloss    += destep;
	tlength  += step; 

        if  ( gMC->IsTrackEntering()  )  {  
       
            gMC->TrackPosition(pos);
     
            gMC->TrackMomentum(mom);      
            Double_t tc   = mom[0]*mom[0]+mom[1]*mom[1];
            Double_t pt   = TMath::Sqrt(tc);
	    Double_t pmom = TMath::Sqrt(tc+mom[2]*mom[2]);
            theta   = Float_t(TMath::ATan2(pt,Double_t(mom[2])))*kRaddeg;
            phi     = Float_t(TMath::ATan2(Double_t(pos[1]),Double_t(pos[0])))*kRaddeg;

////////////////////////////////////////////////////////////////////////////         
     Float_t angle1 = Float_t(TMath::ATan2(Double_t(pos[1]),Double_t(pos[0])))*kRaddeg;
     if(angle1 < 0.0) angle1 = angle1 + 360.0;
     //PH     AliDebug(2,Form("RingNumber, copy, phi1  = %f %d %f \n", ringNumber,vol[1],angle1)); 
////////////////////////////////////////////////////////////////////////////	
	 	 
     
            ipart  = gMC->TrackPid();

            hits[0]  = pos[0];
            hits[1]  = pos[1];
            hits[2]  = pos[2];	 	 
	    hits[3]  =  Float_t (ipart); 

	    hits[4]  = gMC->TrackTime();
            hits[5]  = gMC->TrackCharge();
	    hits[6]  = theta;
	    hits[7]  = phi;
	    hits[8]  = ringNumber;
	 
	    hits[9]  = pt;
	    hits[10] = pmom;
	    hits[11] = mom[0];
	    hits[12] = mom[1];
	    hits[13] = mom[2];
	    
	    TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
            hits[14] = par->Vx();
            hits[15] = par->Vy();
            hits[16] = par->Vz();
            
 	    tlength  = 0.0;
	    eloss    = 0.0;
	    
         }
	 
	 if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
	 
	 hits[17] =   eloss;
	 hits[18] = tlength;
	 
         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
	 	 
	 tlength  = 0.0;
	 eloss    = 0.0; 
	  
	 } 
    }
      
}

//_____________________________________________________________________________
void AliVZEROv2::AddHit(Int_t track, Int_t *vol, Float_t *hits)
{
  
//  Adds a VZERO hit
  
  TClonesArray &lhits = *fHits;
  new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
}

//_____________________________________________________________________________
void AliVZEROv2::AddDigits(Int_t *tracks, Int_t* digits) 
{

//  Adds a VZERO digit

   TClonesArray  &ldigits = *fDigits;
   new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
}

//_____________________________________________________________________________
void AliVZEROv2::MakeBranch(Option_t *option)
{
  
// Creates new branches in the current Root Tree
    
  char branchname[10];
  sprintf(branchname,"%s",GetName());
  AliDebug(2,Form("fBufferSize = %d",fBufferSize));
  
  const char *cH = strstr(option,"H");
  
  if (fHits   && fLoader->TreeH() && cH) {
    fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
    AliDebug(2,Form("Making Branch %s for hits",branchname));
  }     

  const char *cD = strstr(option,"D");
  
  if (fDigits   && fLoader->TreeD() && cD) {
    fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
    AliDebug(2,Form("Making Branch %s for digits",branchname));
  }  
   
}