VZERO/AliVZEROv3.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15
  16 /* $Id$ */
  17
  18 //////////////////////////////////////////////////////////////////////
  19 //                                                                  //
  20 //  (V-zero) detector  version 3  as designed by the Lyon group     //
  21 //   All comments should be sent to Brigitte CHEYNIS :              //
  22 //                                  b.cheynis@ipnl.in2p3.fr         //
  23 //   Geometry of the   4th of december 2003                         //
  24 //  (now 3 rings instead of 5 rings as in previous versions -budget //
  25 //   cuts !! - therefore changes in cell dimensions and offsets)    //
  26 //   previous ring 1 and ring 2 become now ring 1                   //
  27 //   previous ring 3 and ring 4 become now ring 2                   //
  28 //   previous ring 5 becomes now ring 3  - both for Left and Right  //
  29 //   V0R (now V0C) sits between Z values  -89.4 and  -84.9 cm       //
  30 //   V0L (now V0A) sits between Z values +350.0 and +352.0 cm       //
  31 //   New coordinate system has been implemented in october 2003     //
  32 //                                                                  //
  33 //////////////////////////////////////////////////////////////////////
  34
  35 // --- Standard libraries ---
  36 #include <Riostream.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 // --- ROOT libraries ---
  41 #include <TClonesArray.h>
  42 #include <TGeometry.h>
  43 #include <TLorentzVector.h>
  44 #include <TMath.h>
  45 #include <TNode.h>
  46 #include <TObjectTable.h>
  47 #include <TTUBE.h>
  48 #include <TTUBS.h>
  49 #include <TVirtualMC.h>
  50 #include <TParticle.h>
  51
  52 // --- AliRoot header files ---
  53 #include "AliConst.h"
  54 #include "AliLog.h"
  55 #include "AliMC.h"
  56 #include "AliMagF.h"
  57 #include "AliRun.h"
  58 #include "AliVZEROLoader.h"
  59 #include "AliVZEROdigit.h"
  60 #include "AliVZEROhit.h"
  61 #include "AliVZEROv3.h"
  62
  63 ClassImp(AliVZEROv3)
  64
  65 //_____________________________________________________________________________
  66 AliVZEROv3:: AliVZEROv3():AliVZERO(),
  67    fCellId(0),
  68    fTrackPosition(),
  69    fTrackMomentum(),
  70    fLightYield(93.75),
  71    fLightAttenuation(0.05),
  72    fnMeters(15.0),
  73    fFibToPhot(0.3)
  74 {
  75 // Standard default constructor
  76 }
  77
  78 //_____________________________________________________________________________
  79 AliVZEROv3::AliVZEROv3(const char *name, const char *title):
  80    AliVZERO(name,title),
  81    fCellId(0),
  82    fTrackPosition(),
  83    fTrackMomentum(),
  84    fLightYield(93.75),
  85    fLightAttenuation(0.05),
  86    fnMeters(15.0),
  87    fFibToPhot(0.3)
  88 {
  89
  90 // Standard constructor for V-zero Detector  version 2
  91
  92   AliDebug(2,"Create VZERO object");
  93
  94 //   fLightYield              =  93.75;
  95 //   fLightAttenuation        =   0.05;
  96 //   fnMeters                 =   15.0;
  97 //   fFibToPhot               =    0.3;
  98
  99 }
 100
 101 //_____________________________________________________________________________
 102 void AliVZEROv3::CreateGeometry()
 103 {
 104
 105 // Creates the GEANT geometry of the V-zero Detector  version 3
 106
 107   AliDebug(2,"Create VZERO Geometry");
 108
 109   Int_t    *idtmed = fIdtmed->GetArray()-2999;
 110
 111   Int_t    ndetR = 1;
 112   Int_t    ndetL = 1;
 113
 114   Int_t    ncellsR = 1;
 115   Int_t    ncellsL = 1;
 116
 117   Int_t    idrotm[999];
 118
 119   Float_t  height1Right, height2Right, height3Right;
 120   Float_t  heightRight;
 121   Float_t  theta;
 122
 123   Float_t  halfThickQua;
 124
 125   Float_t  zdet;
 126   Float_t  r0Right, r3Right;
 127   Float_t  pi = TMath::Pi();
 128
 129   height1Right    =     1.82 + 3.81;  // height of cell 1, in cm
 130   height2Right    =     4.72 + 7.12;  // height of cell 2, in cm
 131   height3Right    =           10.83;  // height of cell 3, in cm
 132
 133   theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
 134
 135   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
 136
 137 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from
 138 // absorber nose sitting at 90 cm. Will use -zdet later...
 139 // size of V0R box  (fThickness) is increased by 1 mm as compared to version v2
 140
 141   fThickness  =    fThickness + 0.1;
 142   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)
 143   r0Right     =    4.05;          // closest distance to center of the beam pipe
 144   heightRight =    height1Right + height2Right + height3Right;
 145   r3Right     =    r0Right + heightRight;
 146
 147 // Creation of mother volume v0LE - left part - :
 148 // Entrance face at  +350.0 cm  (new coordinate system) ...
 149
 150    Float_t   partube[3];
 151
 152    partube[0] =  4.3;
 153    partube[1] = 45.0;
 154    partube[2] = fThickness1/2.0;
 155
 156    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
 157
 158 // Creation of five rings - left part - :
 159 // Entrance face at +350.0 cm  (new coordinate system) ...
 160
 161 // Mother volume v0L0 in which will be set 5 scintillator cells
 162
 163   Float_t   partubs[5];
 164
 165   Float_t   r0Left      =   4.3;
 166   Float_t   height1Left =   2.6 +  4.1;  // previous ring 1 + ring 2
 167   Float_t   height2Left =   6.4 + 10.2;  // previous ring 3 + ring 4
 168   Float_t   height3Left =  16.9;
 169   Float_t   heightLeft  =   height1Left + height2Left + height3Left;
 170
 171   Float_t   r3Left      =   r0Left  + heightLeft;
 172
 173   partubs[0]     =  r0Left;
 174   partubs[1]     =  r3Left;
 175   partubs[2]     =  fThickness1/2.0;
 176   partubs[3]     =  90.0-15.0;
 177   partubs[4]     = 120.0-15.0;
 178
 179   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
 180
 181   Float_t  r1Left =  r0Left + height1Left;
 182
 183   partubs[0]     =  r0Left;
 184   partubs[1]     =  r1Left;
 185
 186   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
 187   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 188
 189   Float_t  r2Left  =  r1Left + height2Left;
 190
 191   partubs[0]     =  r1Left;
 192   partubs[1]     =  r2Left;
 193
 194   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
 195   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 196
 197   partubs[0]     =  r2Left;
 198   partubs[1]     =  r3Left;
 199
 200   gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
 201   gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 202
 203
 204 // Creation of mother volume v0RI - right part - :
 205
 206   partube[0] = r0Right - 0.2;
 207   partube[1] = r3Right + 1.0;
 208   partube[2] = fThickness/2.0;
 209
 210   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
 211
 212 // Creation of  carbon lids (3.5 mm thick) to keep v0RI box shut...
 213
 214   Float_t  lidThickness = 0.35;
 215
 216   partube[0] =   r0Right;
 217   partube[1] =   r3Right;
 218   partube[2] =   +lidThickness/2.0;
 219
 220   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3);
 221   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
 222   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
 223
 224 // Creation of aluminum rings to maintain the v0RI pieces ...
 225
 226   partube[0] =   r0Right - 0.2;
 227   partube[1] =   r0Right;
 228   partube[2] =   +fThickness/2.0;
 229
 230   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);
 231   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 232
 233   partube[0] =   r3Right;
 234   partube[1] =   r3Right + 1.0;
 235   partube[2] =   +fThickness/2.0;
 236
 237   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);
 238   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 239
 240 // Mother volume v0R0 in which will be set 3  scintillator cells
 241
 242   partubs[0]      =  r0Right;
 243   partubs[1]      =  r3Right;
 244   partubs[2]      =  fThickness/2.0;
 245   partubs[3]      =  90.0-15.0;
 246   partubs[4]      = 120.0-15.0;
 247
 248   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume
 249
 250 // Elementary cell of ring 1 :
 251 // (cells of ring 1  will be shifted by 1.7 cm towards vertex to output fibers)
 252
 253   Float_t   offsetFibers  =  1.7;
 254   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0;
 255   Float_t   r1Right       =  r0Right + height1Right;
 256
 257   partubs[0]     =  r0Right;
 258   partubs[1]     =  r1Right;
 259   partubs[2]     =  fThickness1/2.0;
 260
 261   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 262   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY");
 263
 264 // Elementary cell of ring 2 :
 265
 266   Float_t   r2Right   =  r1Right + height2Right;
 267
 268   partubs[0]     =  r1Right;
 269   partubs[1]     =  r2Right;
 270
 271   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 272   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 273
 274
 275 // Elementary cell of ring 3 :
 276
 277   partubs[0]     =  r2Right;
 278   partubs[1]     =  r3Right;
 279
 280   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 281   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 282
 283
 284   Float_t  phiDeg = 180./6.;
 285
 286 // Right part :
 287
 288   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
 289       {
 290         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 291         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
 292                           0.0,0.0,idrotm[902],"ONLY");
 293         ndetR++;
 294        }
 295
 296   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
 297
 298   ncellsR = (ndetR - 1) * 3;
 299   AliInfo(Form("Number of cells on Right side =   %d",ncellsR));
 300
 301 // Left part :
 302
 303   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
 304       {
 305         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 306         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
 307                           0.0,0.0,idrotm[902],"ONLY");
 308         ndetL++;
 309        }
 310
 311   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
 312
 313   ncellsL = (ndetL - 1) * 3;
 314   AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));
 315
 316 }
 317
 318 //_____________________________________________________________________________
 319 void AliVZEROv3::CreateMaterials()
 320 {
 321
 322 // Creates materials used for geometry
 323
 324     AliDebug(2,"VZERO create materials");
 325
 326 /*
 327     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,
 328                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 329
 330
 331     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,
 332                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 333
 334     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458,
 335                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362,
 336                                  1.662295, 1.68337 };
 337
 338     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525,
 339                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };
 340
 341     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 342
 343
 344     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 345
 346
 347     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,
 348                                1e-4,1e-4,1e-4,1e-4 };
 349     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 350
 351 */
 352
 353     Int_t *idtmed = fIdtmed->GetArray()-2999;
 354
 355
 356 //  Parameters related to Quarz (SiO2) :
 357
 358     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
 359     Int_t nlmatqua;
 360
 361     aqua[0]    = 28.09;
 362     aqua[1]    = 16.;
 363     zqua[0]    = 14.;
 364     zqua[1]    = 8.;
 365     densqua    = 2.64;
 366     nlmatqua   = -2;
 367     wmatqua[0] = 1.;
 368     wmatqua[1] = 2.;
 369
 370 // Parameters  related to aluminum sheets :
 371
 372     Float_t  aal   = 26.98;
 373     Float_t  zal   = 13.00;
 374     Float_t  densal=   2.7;
 375     Float_t  radlal=   8.9;
 376
 377 // Parameters  related to scintillator CH :
 378
 379     Float_t ascin[2] = {1.00794,12.011};
 380     Float_t zscin[2] = {1.,6.};
 381     Float_t wscin[2] = {1.,1.};
 382     Float_t denscin  = 1.032;
 383
 384 // AIR
 385
 386     Float_t aAir[4]={12.,14.,16.,36.};
 387     Float_t zAir[4]={6.,7.,8.,18.};
 388     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
 389     Float_t dAir = 1.20479E-3;
 390
 391 //  Definition of materials :
 392
 393 // AIR
 394
 395     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
 396     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
 397     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
 398     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
 399     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
 400     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
 401
 402     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 403
 404
 405     Int_t   iSXFLD = gAlice->Field()->Integ();
 406     Float_t sXMGMX = gAlice->Field()->Max();
 407
 408     Float_t tmaxfd, stemax, deemax, epsil, stmin;
 409
 410     tmaxfd = 10.;
 411     stemax = 0.1;
 412     deemax = 0.1;
 413     epsil  = 0.001;
 414     stmin  = 0.001;
 415
 416 //  Active Air :
 417     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
 418               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 419
 420 //  Inactive air :
 421
 422     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
 423               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 424
 425     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
 426               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);
 427
 428     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
 429               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
 430
 431     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
 432               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 433
 434
 435     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
 436               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 437
 438     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
 439
 440     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
 441     gMC->Gstpar(idtmed[3000], "HADR", 1.);
 442     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
 443     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
 444
 445     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
 446     gMC->Gstpar(idtmed[3001], "HADR", 1.);
 447     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
 448     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
 449
 450     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
 451     gMC->Gstpar(idtmed[3002], "HADR", 1.);
 452     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
 453     gMC->Gstpar(idtmed[3002], "DRAY", 1.);
 454     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ;
 455     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
 456
 457     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
 458     gMC->Gstpar(idtmed[3003], "HADR", 1.);
 459     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
 460     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
 461
 462     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
 463     gMC->Gstpar(idtmed[3004], "HADR", 1.);
 464     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
 465     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
 466     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ;
 467     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
 468
 469     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
 470     gMC->Gstpar(idtmed[3005], "HADR", 1.);
 471     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
 472     gMC->Gstpar(idtmed[3005], "DRAY", 1.);
 473     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ;
 474     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
 475
 476
 477 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 478 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 479
 480 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 481 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 482
 483 }
 484
 485 //_____________________________________________________________________________
 486 void AliVZEROv3::DrawModule() const
 487 {
 488
 489 //  Drawing is done in DrawVZERO.C
 490
 491    AliDebug(2,"VZERO DrawModule");
 492
 493 }
 494
 495 //_____________________________________________________________________________
 496 void AliVZEROv3::Init()
 497 {
 498 // Initialises version 2 of the VZERO Detector
 499 // Just prints an information message
 500
 501   AliInfo(Form("VZERO version %d initialized",IsVersion()));
 502
 503 //   gMC->SetMaxStep(fMaxStepAlu);
 504 //   gMC->SetMaxStep(fMaxStepQua);
 505
 506     AliVZERO::Init();
 507
 508 }
 509
 510
 511 //_____________________________________________________________________________
 512 void AliVZEROv3::StepManager()
 513 {
 514
 515 // Step Manager, called at each step
 516
 517      Int_t     copy;
 518      static    Int_t   vol[4];
 519      static    Float_t hits[21];
 520      static    Float_t eloss, tlength;
 521      static    Int_t   nPhotonsInStep;
 522      static    Int_t   nPhotons;
 523      static    Int_t   numStep;
 524      Float_t   ringNumber;
 525      Float_t   destep, step;
 526
 527      numStep += 1;
 528
 529 //   We keep only charged tracks :
 530
 531      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return;
 532
 533      static Int_t idV0R1 = gMC->VolId("V0R1");
 534      static Int_t idV0L1 = gMC->VolId("V0L1");
 535      static Int_t idV0R2 = gMC->VolId("V0R2");
 536      static Int_t idV0L2 = gMC->VolId("V0L2");
 537      static Int_t idV0R3 = gMC->VolId("V0R3");
 538      static Int_t idV0L3 = gMC->VolId("V0L3");
 539
 540      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
 541      vol[2]    = gMC->CurrentVolID(copy);
 542      vol[3]    = copy;
 543
 544      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
 545                gMC->CurrentVolID(copy) == idV0L1 )
 546                ringNumber = 1.0;
 547      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
 548                gMC->CurrentVolID(copy) == idV0L2 )
 549                ringNumber = 2.0;
 550      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
 551                gMC->CurrentVolID(copy) == idV0L3 )
 552                ringNumber = 3.0;
 553      else
 554                ringNumber = 0.0;
 555
 556      if  (  ringNumber > 0.5  ) {
 557
 558         destep    = gMC->Edep();
 559         step      = gMC->TrackStep();
 560
 561         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) );
 562         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
 563
 564         eloss    += destep;
 565         tlength  += step;
 566
 567         if  ( gMC->IsTrackEntering()  )  {
 568
 569             nPhotons  =  nPhotonsInStep;
 570             gMC->TrackPosition(fTrackPosition);
 571             gMC->TrackMomentum(fTrackMomentum);
 572
 573             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
 574                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
 575
 576             hits[0]  = fTrackPosition.X();
 577             hits[1]  = fTrackPosition.Y();
 578             hits[2]  = fTrackPosition.Z();
 579             hits[3]  = Float_t (gMC->TrackPid());
 580
 581             hits[4]  = gMC->TrackTime();
 582             hits[5]  = gMC->TrackCharge();
 583             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
 584             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
 585             hits[8]  = ringNumber;
 586
 587             hits[9]  = pt;
 588             hits[10] = fTrackMomentum.P();
 589             hits[11] = fTrackMomentum.Px();
 590             hits[12] = fTrackMomentum.Py();
 591             hits[13] = fTrackMomentum.Pz();
 592
 593             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
 594             hits[14] = par->Vx();
 595             hits[15] = par->Vy();
 596             hits[16] = par->Vz();
 597
 598             tlength  = 0.0;
 599             eloss    = 0.0;
 600
 601          }
 602
 603          nPhotons  = nPhotons + nPhotonsInStep;
 604
 605          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
 606
 607          nPhotons  = nPhotons - Int_t( (Float_t(nPhotons) * fLightAttenuation * fnMeters) );
 608          nPhotons  = nPhotons - Int_t(  Float_t(nPhotons) * fFibToPhot );
 609
 610          hits[17] =   eloss;
 611          hits[18] = tlength;
 612          hits[19] = nPhotons;
 613          hits[20] = GetCellId (vol, hits);
 614
 615          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
 616
 617          tlength         = 0.0;
 618          eloss           = 0.0;
 619          nPhotons        =   0;
 620          nPhotonsInStep  =   0;
 621
 622          numStep         =   0;
 623          }
 624     }
 625
 626 }
 627
 628 //_____________________________________________________________________________
 629 void AliVZEROv3::AddHit(Int_t track, Int_t *vol, Float_t *hits)
 630 {
 631
 632 //  Adds a VZERO hit
 633
 634   TClonesArray &lhits = *fHits;
 635   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
 636 }
 637
 638 //_____________________________________________________________________________
 639 void AliVZEROv3::AddDigits(Int_t *tracks, Int_t* digits)
 640 {
 641
 642 //  Adds a VZERO digit
 643
 644    TClonesArray  &ldigits = *fDigits;
 645    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
 646 }
 647
 648 //_____________________________________________________________________________
 649 void AliVZEROv3::MakeBranch(Option_t *option)
 650 {
 651
 652 // Creates new branches in the current Root Tree
 653
 654   char branchname[10];
 655   sprintf(branchname,"%s",GetName());
 656   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
 657
 658   const char *cH = strstr(option,"H");
 659
 660   if (fHits   && fLoader->TreeH() && cH) {
 661     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
 662     AliDebug(2,Form("Making Branch %s for hits",branchname));
 663   }
 664
 665   const char *cD = strstr(option,"D");
 666
 667   if (fDigits   && fLoader->TreeD() && cD) {
 668     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
 669     AliDebug(2,Form("Making Branch %s for digits",branchname));
 670   }
 671
 672 }
 673
 674 //_____________________________________________________________________________
 675 Int_t AliVZEROv3::GetCellId(Int_t *vol, Float_t *hits)
 676 {
 677
 678   //   Returns Id of scintillator cell
 679   //   Right side from  0 to 35
 680   //   Left  side from 36 to 71
 681
 682    Int_t index = vol[1];
 683    fCellId     = 0;
 684
 685    if (index < 10) index = index + 12;
 686
 687    if (hits[2] < 0.0) {
 688       index = (index - 10) + ( ( Int_t(hits[8]) - 1 ) * 12);
 689       fCellId   = index;
 690    }
 691    else if (hits[2] > 0.0)
 692    {
 693       index = (index  + 26) + ( ( Int_t(hits[8]) - 1 ) * 12);
 694       fCellId   = index;}
 695
 696    return fCellId;
 697 }