VZERO/AliVZEROv4.cxx

   1 /**************************************************************************
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   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15
  16 /* $Id$ */
  17
  18 //////////////////////////////////////////////////////////////////////
  19 //                                                                  //
  20 //  (V-zero) detector  version 4  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   24th of february 2004                        //
  24 //  (now 4 rings instead of 3 rings as in previous version)         //
  25 //   V0R (now V0C) sits between Z values  -89.4 and  -84.9 cm       //
  26 //   V0L (now V0A) sits between Z values +350.0 and +352.0 cm       //
  27 //   New coordinate system has been implemented in october 2003     //
  28 //                                                                  //
  29 //////////////////////////////////////////////////////////////////////
  30
  31 // --- Standard libraries ---
  32 #include <Riostream.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 // --- ROOT libraries ---
  37 #include <TClonesArray.h>
  38 #include <TLorentzVector.h>
  39 #include <TMath.h>
  40 #include <TObjectTable.h>
  41 #include <TVirtualMC.h>
  42 #include <TParticle.h>
  43
  44 // --- AliRoot header files ---
  45 #include "AliRun.h"
  46 #include "AliMC.h"
  47 #include "AliConst.h"
  48 #include "AliLog.h"
  49 #include "AliMagF.h"
  50 #include "AliVZEROLoader.h"
  51 #include "AliVZEROdigit.h"
  52 #include "AliVZEROhit.h"
  53 #include "AliVZEROv4.h"
  54
  55 ClassImp(AliVZEROv4)
  56
  57 //_____________________________________________________________________________
  58 AliVZEROv4:: AliVZEROv4():AliVZERO(),
  59    fCellId(0),
  60    fTrackPosition(),
  61    fTrackMomentum(),
  62    fLightYield(93.75),
  63    fLightAttenuation(0.05),
  64    fnMeters(15.0),
  65    fFibToPhot(0.3)
  66
  67 {
  68 // Standard default constructor
  69 }
  70
  71 //_____________________________________________________________________________
  72 AliVZEROv4::AliVZEROv4(const char *name, const char *title):
  73    AliVZERO(name,title),
  74    fCellId(0),
  75    fTrackPosition(),
  76    fTrackMomentum(),
  77    fLightYield(93.75),
  78    fLightAttenuation(0.05),
  79    fnMeters(15.0),
  80    fFibToPhot(0.3)
  81
  82 {
  83
  84 // Standard constructor for V-zero Detector  version 2
  85
  86   AliDebug(2,"Create VZERO object");
  87 //
  88 //   fLightYield              =  93.75; // Light yield in BC408 (93.75 eV per photon)
  89 //   fLightAttenuation        =   0.05; // Light attenuation in fiber (0.05 per meter)
  90 //   fnMeters                 =   15.0; // Number of meters of clear fibers to PM
  91 //   fFibToPhot               =    0.3; // Attenuation at fiber-photocathode interface
  92 }
  93
  94 //_____________________________________________________________________________
  95 void AliVZEROv4::CreateGeometry()
  96 {
  97
  98 // Creates the GEANT geometry of the V-zero Detector  version 3
  99
 100   AliDebug(2,"Create VZERO Geometry ");
 101
 102   Int_t    *idtmed = fIdtmed->GetArray()-2999;
 103
 104   Int_t    ndetR = 1;
 105   Int_t    ndetL = 1;
 106
 107   Int_t    ncellsR = 1;
 108   Int_t    ncellsL = 1;
 109
 110   Int_t    idrotm[999];
 111
 112   Float_t  height1Right, height2Right, height3Right, height4Right;
 113   Float_t  heightRight;
 114   Float_t  theta;
 115
 116   Float_t  halfThickQua;
 117
 118   Float_t  zdet;
 119   Float_t  r0Right, r4Right;
 120   Float_t  pi = TMath::Pi();
 121
 122   height1Right    =     3.42;  // height of cell 1, in cm
 123   height2Right    =     6.78;  // height of cell 2, in cm
 124   height3Right    =     7.11;  // height of cell 3, in cm
 125   height4Right    =    10.91;  // height of cell 4, in cm
 126
 127   theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
 128
 129   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
 130
 131 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from
 132 // absorber nose sitting at 90 cm. Will use -zdet later...
 133 // size of V0R box  (fThickness) is increased by 1 mm as compared to version v2
 134
 135   fThickness  =    fThickness + 0.1;
 136   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)
 137   r0Right     =    4.05;          // closest distance to center of the beam pipe
 138   heightRight =    height1Right + height2Right + height3Right + height4Right;
 139   r4Right     =    r0Right + heightRight;
 140
 141 // Creation of mother volume v0LE - left part - :
 142 // Entrance face at  +350.0 cm  (new coordinate system) ...
 143
 144    Float_t   partube[3];
 145
 146    partube[0] =  4.3;
 147    partube[1] = 45.0;
 148    partube[2] = fThickness1/2.0;
 149
 150    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
 151
 152 // Creation of five rings - left part - :
 153 // Entrance face at +350.0 cm  (new coordinate system) ...
 154
 155 // Mother volume v0L0 in which will be set 5 scintillator cells
 156
 157   Float_t   partubs[5];
 158
 159   Float_t   r0Left      =   4.3;
 160   Float_t   height1Left =   3.6;
 161   Float_t   height2Left =   6.4;
 162   Float_t   height3Left =  14.9;
 163   Float_t   height4Left =  14.4;
 164   Float_t   heightLeft  =   height1Left + height2Left + height3Left + height4Left;
 165
 166   Float_t   r4Left      =   r0Left  + heightLeft;
 167
 168   partubs[0]     =  r0Left;
 169   partubs[1]     =  r4Left;
 170   partubs[2]     =  fThickness1/2.0;
 171   partubs[3]     =  90.0-15.0;
 172   partubs[4]     = 120.0-15.0;
 173
 174   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
 175
 176   Float_t  r1Left =  r0Left + height1Left;
 177
 178   partubs[0]     =  r0Left;
 179   partubs[1]     =  r1Left;
 180
 181   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
 182   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 183
 184   Float_t  r2Left  =  r1Left + height2Left;
 185
 186   partubs[0]     =  r1Left;
 187   partubs[1]     =  r2Left;
 188
 189   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
 190   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 191
 192   Float_t  r3Left  =  r2Left + height3Left;
 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   partubs[0]     =  r3Left;
 201   partubs[1]     =  r4Left;
 202
 203   gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
 204   gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 205
 206 // Creation of mother volume v0RI - right part - :
 207
 208   partube[0] = r0Right - 0.2;
 209   partube[1] = r4Right + 1.0;
 210   partube[2] = fThickness/2.0;
 211
 212   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
 213
 214 // Creation of  carbon lids (3.5 mm thick) to keep v0RI box shut...
 215
 216   Float_t  lidThickness = 0.35;
 217
 218   partube[0] =   r0Right;
 219   partube[1] =   r4Right;
 220   partube[2] =   +lidThickness/2.0;
 221
 222   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3);
 223   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
 224   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
 225
 226 // Creation of aluminum rings to maintain the v0RI pieces ...
 227
 228   partube[0] =   r0Right - 0.2;
 229   partube[1] =   r0Right;
 230   partube[2] =   +fThickness/2.0;
 231
 232   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);
 233   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 234
 235   partube[0] =   r4Right;
 236   partube[1] =   r4Right + 1.0;
 237   partube[2] =   +fThickness/2.0;
 238
 239   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);
 240   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 241
 242 // Mother volume v0R0 in which will be set 4  scintillator cells
 243
 244   partubs[0]      =  r0Right;
 245   partubs[1]      =  r4Right;
 246   partubs[2]      =  fThickness/2.0;
 247   partubs[3]      =  90.0-15.0;
 248   partubs[4]      = 120.0-15.0;
 249
 250   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume
 251
 252 // Elementary cell of ring 1 :
 253 // (cells of ring 1  will be shifted by 1.7 cm towards vertex to output fibers)
 254
 255   Float_t   offsetFibers  =  1.7;
 256   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0;
 257   Float_t   r1Right       =  r0Right + height1Right;
 258
 259   partubs[0]     =  r0Right;
 260   partubs[1]     =  r1Right;
 261   partubs[2]     =  fThickness1/2.0;
 262
 263   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 264   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY");
 265
 266 // Elementary cell of ring 2 :
 267
 268   Float_t   r2Right   =  r1Right + height2Right;
 269
 270   partubs[0]     =  r1Right;
 271   partubs[1]     =  r2Right;
 272
 273   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 274   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 275
 276
 277 // Elementary cell of ring 3 :
 278
 279   Float_t   r3Right   =  r2Right + height3Right;
 280
 281   partubs[0]     =  r2Right;
 282   partubs[1]     =  r3Right;
 283
 284   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 285   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 286
 287 // Elementary cell of ring 4 :
 288
 289   partubs[0]     =  r3Right;
 290   partubs[1]     =  r4Right;
 291
 292   gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 293   gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 294
 295   Float_t  phiDeg = 180./6.;
 296
 297 // Right part :
 298
 299   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
 300       {
 301         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 302         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
 303                           0.0,0.0,idrotm[902],"ONLY");
 304         ndetR++;
 305        }
 306
 307   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
 308
 309   ncellsR = (ndetR - 1) * 4;
 310   AliInfo(Form("Number of cells on Right side =   %d",  ncellsR));
 311
 312 // Left part :
 313
 314   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
 315       {
 316         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 317         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
 318                           0.0,0.0,idrotm[902],"ONLY");
 319         ndetL++;
 320        }
 321
 322   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
 323
 324   ncellsL = (ndetL - 1) * 4;
 325   AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));
 326
 327 }
 328
 329 //_____________________________________________________________________________
 330 void AliVZEROv4::CreateMaterials()
 331 {
 332
 333 // Creates materials used for geometry
 334
 335     AliDebug(2,"VZERO create materials");
 336
 337 /*
 338     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,
 339                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 340
 341
 342     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,
 343                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 344
 345     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458,
 346                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362,
 347                                  1.662295, 1.68337 };
 348
 349     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525,
 350                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };
 351
 352     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 353
 354
 355     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 356
 357
 358     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,
 359                                1e-4,1e-4,1e-4,1e-4 };
 360     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 361
 362 */
 363
 364     Int_t *idtmed = fIdtmed->GetArray()-2999;
 365
 366
 367 //  Parameters related to Quarz (SiO2) :
 368
 369     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
 370     Int_t nlmatqua;
 371
 372     aqua[0]    = 28.09;
 373     aqua[1]    = 16.;
 374     zqua[0]    = 14.;
 375     zqua[1]    = 8.;
 376     densqua    = 2.64;
 377     nlmatqua   = -2;
 378     wmatqua[0] = 1.;
 379     wmatqua[1] = 2.;
 380
 381 // Parameters  related to aluminum sheets :
 382
 383     Float_t  aal   = 26.98;
 384     Float_t  zal   = 13.00;
 385     Float_t  densal=   2.7;
 386     Float_t  radlal=   8.9;
 387
 388 // Parameters  related to scintillator CH :
 389
 390     Float_t ascin[2] = {1.00794,12.011};
 391     Float_t zscin[2] = {1.,6.};
 392     Float_t wscin[2] = {1.,1.};
 393     Float_t denscin  = 1.032;
 394
 395 // AIR
 396
 397     Float_t aAir[4]={12.,14.,16.,36.};
 398     Float_t zAir[4]={6.,7.,8.,18.};
 399     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
 400     Float_t dAir = 1.20479E-3;
 401
 402 //  Definition of materials :
 403
 404 // AIR
 405
 406     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
 407     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
 408     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
 409     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
 410     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
 411     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
 412
 413     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 414
 415
 416     Int_t   iSXFLD = gAlice->Field()->Integ();
 417     Float_t sXMGMX = gAlice->Field()->Max();
 418
 419     Float_t tmaxfd, stemax, deemax, epsil, stmin;
 420
 421     tmaxfd = 10.;
 422     stemax = 0.1;
 423     deemax = 0.1;
 424     epsil  = 0.001;
 425     stmin  = 0.001;
 426
 427 //  Active Air :
 428     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
 429               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 430
 431 //  Inactive air :
 432
 433     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
 434               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 435
 436     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
 437               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);
 438
 439     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
 440               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
 441
 442     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
 443               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 444
 445
 446     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
 447               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 448
 449     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
 450
 451     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
 452     gMC->Gstpar(idtmed[3000], "HADR", 1.);
 453     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
 454     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
 455
 456     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
 457     gMC->Gstpar(idtmed[3001], "HADR", 1.);
 458     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
 459     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
 460
 461     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
 462     gMC->Gstpar(idtmed[3002], "HADR", 1.);
 463     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
 464     gMC->Gstpar(idtmed[3002], "DRAY", 1.);
 465     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ;
 466     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
 467
 468     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
 469     gMC->Gstpar(idtmed[3003], "HADR", 1.);
 470     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
 471     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
 472
 473     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
 474     gMC->Gstpar(idtmed[3004], "HADR", 1.);
 475     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
 476     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
 477     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ;
 478     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
 479
 480     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
 481     gMC->Gstpar(idtmed[3005], "HADR", 1.);
 482     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
 483     gMC->Gstpar(idtmed[3005], "DRAY", 1.);
 484     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ;
 485     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
 486
 487
 488 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 489 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 490
 491 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 492 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 493
 494 }
 495
 496 //_____________________________________________________________________________
 497 void AliVZEROv4::DrawModule() const
 498 {
 499
 500 //  Drawing is done in DrawVZERO.C
 501
 502    AliDebug(2,"VZERO DrawModule");
 503 }
 504
 505 //_____________________________________________________________________________
 506 void AliVZEROv4::Init()
 507 {
 508 // Initialises version 2 of the VZERO Detector
 509 // Just prints an information message
 510
 511   AliDebug(2,Form("VZERO version %d initialized",IsVersion()));
 512
 513 //   gMC->SetMaxStep(fMaxStepAlu);
 514 //   gMC->SetMaxStep(fMaxStepQua);
 515
 516     AliVZERO::Init();
 517 }
 518
 519 //_____________________________________________________________________________
 520 void AliVZEROv4::StepManager()
 521 {
 522
 523 // Step Manager, called at each step
 524
 525      Int_t     copy;
 526      static    Int_t   vol[4];
 527      static    Float_t hits[21];
 528      static    Float_t eloss, tlength;
 529      static    Int_t   nPhotonsInStep;
 530      static    Int_t   nPhotons;
 531      static    Int_t   numStep;
 532      Float_t   ringNumber;
 533      Float_t   destep, step;
 534
 535      numStep += 1;
 536
 537 //   We keep only charged tracks :
 538
 539      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return;
 540
 541      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
 542      vol[2]    = gMC->CurrentVolID(copy);
 543      vol[3]    = copy;
 544
 545      static Int_t idV0R1 = gMC->VolId("V0R1");
 546      static Int_t idV0L1 = gMC->VolId("V0L1");
 547      static Int_t idV0R2 = gMC->VolId("V0R2");
 548      static Int_t idV0L2 = gMC->VolId("V0L2");
 549      static Int_t idV0R3 = gMC->VolId("V0R3");
 550      static Int_t idV0L3 = gMC->VolId("V0L3");
 551      static Int_t idV0R4 = gMC->VolId("V0R4");
 552      static Int_t idV0L4 = gMC->VolId("V0L4");
 553
 554      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
 555                gMC->CurrentVolID(copy) == idV0L1 )
 556                ringNumber = 1.0;
 557      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
 558                gMC->CurrentVolID(copy) == idV0L2 )
 559                ringNumber = 2.0;
 560      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
 561                gMC->CurrentVolID(copy) == idV0L3 )
 562                ringNumber = 3.0;
 563      else if ( gMC->CurrentVolID(copy) == idV0R4 ||
 564                gMC->CurrentVolID(copy) == idV0L4 )
 565                ringNumber = 4.0;
 566      else
 567                ringNumber = 0.0;
 568
 569      if  (  ringNumber > 0.5  ) {
 570
 571         destep    = gMC->Edep();
 572         step      = gMC->TrackStep();
 573
 574         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) );
 575         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
 576
 577         eloss    += destep;
 578         tlength  += step;
 579
 580         if  ( gMC->IsTrackEntering()  )  {
 581
 582             nPhotons  =  nPhotonsInStep;
 583             gMC->TrackPosition(fTrackPosition);
 584             gMC->TrackMomentum(fTrackMomentum);
 585
 586             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
 587                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
 588
 589             hits[0]  = fTrackPosition.X();
 590             hits[1]  = fTrackPosition.Y();
 591             hits[2]  = fTrackPosition.Z();
 592             hits[3]  = Float_t (gMC->TrackPid());
 593
 594             hits[4]  = gMC->TrackTime();
 595             hits[5]  = gMC->TrackCharge();
 596             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
 597             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
 598             hits[8]  = ringNumber;
 599
 600             hits[9]  = pt;
 601             hits[10] = fTrackMomentum.P();
 602             hits[11] = fTrackMomentum.Px();
 603             hits[12] = fTrackMomentum.Py();
 604             hits[13] = fTrackMomentum.Pz();
 605
 606             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
 607             hits[14] = par->Vx();
 608             hits[15] = par->Vy();
 609             hits[16] = par->Vz();
 610
 611             tlength  = 0.0;
 612             eloss    = 0.0;
 613          }
 614
 615          nPhotons  = nPhotons + nPhotonsInStep;
 616
 617          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
 618
 619          nPhotons  = nPhotons - Int_t((Float_t(nPhotons) * fLightAttenuation * fnMeters));
 620          nPhotons  = nPhotons - Int_t( Float_t(nPhotons) * fFibToPhot);
 621
 622          hits[17] =   eloss;
 623          hits[18] = tlength;
 624          hits[19] = nPhotons;
 625          hits[20] = GetCellId (vol, hits);
 626
 627          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
 628
 629          tlength         = 0.0;
 630          eloss           = 0.0;
 631          nPhotons        =   0;
 632          nPhotonsInStep  =   0;
 633
 634          numStep         =   0;
 635          }
 636     }
 637
 638 }
 639
 640 //_____________________________________________________________________________
 641 void AliVZEROv4::AddHit(Int_t track, Int_t *vol, Float_t *hits)
 642 {
 643
 644 //  Adds a VZERO hit
 645
 646   TClonesArray &lhits = *fHits;
 647   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
 648 }
 649
 650 //_____________________________________________________________________________
 651 void AliVZEROv4::AddDigits(Int_t *tracks, Int_t* digits)
 652 {
 653
 654 //  Adds a VZERO digit
 655
 656    TClonesArray  &ldigits = *fDigits;
 657    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
 658 }
 659
 660 //_____________________________________________________________________________
 661 void AliVZEROv4::MakeBranch(Option_t *option)
 662 {
 663
 664 // Creates new branches in the current Root Tree
 665
 666   char branchname[10];
 667   sprintf(branchname,"%s",GetName());
 668   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
 669
 670   const char *cH = strstr(option,"H");
 671
 672   if (fHits   && fLoader->TreeH() && cH) {
 673     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
 674     AliDebug(2,Form("Making Branch %s for hits",branchname));
 675   }
 676
 677   const char *cD = strstr(option,"D");
 678
 679   if (fDigits   && fLoader->TreeD() && cD) {
 680     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
 681     AliDebug(2,Form("Making Branch %s for digits",branchname));
 682   }
 683
 684 }
 685
 686 //_____________________________________________________________________________
 687 Int_t AliVZEROv4::GetCellId(Int_t *vol, Float_t *hits)
 688 {
 689
 690   //   Returns Id of scintillator cell
 691   //   Right side from  0 to 47
 692   //   Left  side from 48 to 95
 693
 694    Int_t index = vol[1];
 695    fCellId     = 0;
 696
 697    if (index < 10) index = index + 12;
 698
 699    if (hits[2] < 0.0) {
 700       index = (index - 10) + ( ( Int_t(hits[8]) - 1 ) * 12);
 701       fCellId   = index;
 702    }
 703    else if (hits[2] > 0.0)
 704    {
 705       index = (index + 38) + ( ( Int_t(hits[8]) - 1 ) * 12);
 706       fCellId   = index;}
 707
 708    return fCellId;
 709 }