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