VZERO/AliVZEROv4.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 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 <TGeoGlobalMagField.h>
  39 #include <TLorentzVector.h>
  40 #include <TMath.h>
  41 #include <TObjectTable.h>
  42 #include <TParticle.h>
  43 #include <TVirtualMC.h>
  44
  45 // --- AliRoot header files ---
  46 #include "AliRun.h"
  47 #include "AliMC.h"
  48 #include "AliConst.h"
  49 #include "AliLog.h"
  50 #include "AliMagF.h"
  51 #include "AliVZEROLoader.h"
  52 #include "AliVZEROdigit.h"
  53 #include "AliVZEROhit.h"
  54 #include "AliVZEROv4.h"
  55
  56 ClassImp(AliVZEROv4)
  57
  58 //_____________________________________________________________________________
  59 AliVZEROv4:: AliVZEROv4():AliVZERO(),
  60    fCellId(0),
  61    fTrackPosition(),
  62    fTrackMomentum(),
  63    fLightYield(93.75),
  64    fLightAttenuation(0.05),
  65    fnMeters(15.0),
  66    fFibToPhot(0.3)
  67
  68 {
  69 // Standard default constructor
  70 }
  71
  72 //_____________________________________________________________________________
  73 AliVZEROv4::AliVZEROv4(const char *name, const char *title):
  74    AliVZERO(name,title),
  75    fCellId(0),
  76    fTrackPosition(),
  77    fTrackMomentum(),
  78    fLightYield(93.75),
  79    fLightAttenuation(0.05),
  80    fnMeters(15.0),
  81    fFibToPhot(0.3)
  82
  83 {
  84
  85 // Standard constructor for V-zero Detector  version 2
  86
  87   AliDebug(2,"Create VZERO object");
  88 //
  89 //   fLightYield              =  93.75; // Light yield in BC408 (93.75 eV per photon)
  90 //   fLightAttenuation        =   0.05; // Light attenuation in fiber (0.05 per meter)
  91 //   fnMeters                 =   15.0; // Number of meters of clear fibers to PM
  92 //   fFibToPhot               =    0.3; // Attenuation at fiber-photocathode interface
  93 }
  94
  95 //_____________________________________________________________________________
  96 void AliVZEROv4::CreateGeometry()
  97 {
  98
  99 // Creates the GEANT geometry of the V-zero Detector  version 3
 100
 101   AliDebug(2,"Create VZERO Geometry ");
 102
 103   Int_t    *idtmed = fIdtmed->GetArray()-2999;
 104
 105   Int_t    ndetR = 1;
 106   Int_t    ndetL = 1;
 107
 108   Int_t    ncellsR = 1;
 109   Int_t    ncellsL = 1;
 110
 111   Int_t    idrotm[999];
 112
 113   Float_t  height1Right, height2Right, height3Right, height4Right;
 114   Float_t  heightRight;
 115   Float_t  theta;
 116
 117   Float_t  halfThickQua;
 118
 119   Float_t  zdet;
 120   Float_t  r0Right, r4Right;
 121   Float_t  pi = TMath::Pi();
 122
 123   height1Right    =     3.42;  // height of cell 1, in cm
 124   height2Right    =     6.78;  // height of cell 2, in cm
 125   height3Right    =     7.11;  // height of cell 3, in cm
 126   height4Right    =    10.91;  // height of cell 4, in cm
 127
 128   theta       = pi/6.0/2.0;       // half angular opening = 15 degrees
 129
 130   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
 131
 132 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from
 133 // absorber nose sitting at 90 cm. Will use -zdet later...
 134 // size of V0R box  (fThickness) is increased by 1 mm as compared to version v2
 135
 136   fThickness  =    fThickness + 0.1;
 137   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)
 138   r0Right     =    4.05;          // closest distance to center of the beam pipe
 139   heightRight =    height1Right + height2Right + height3Right + height4Right;
 140   r4Right     =    r0Right + heightRight;
 141
 142 // Creation of mother volume v0LE - left part - :
 143 // Entrance face at  +350.0 cm  (new coordinate system) ...
 144
 145    Float_t   partube[3];
 146
 147    partube[0] =  4.3;
 148    partube[1] = 45.0;
 149    partube[2] = fThickness1/2.0;
 150
 151    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
 152
 153 // Creation of five rings - left part - :
 154 // Entrance face at +350.0 cm  (new coordinate system) ...
 155
 156 // Mother volume v0L0 in which will be set 5 scintillator cells
 157
 158   Float_t   partubs[5];
 159
 160   Float_t   r0Left      =   4.3;
 161   Float_t   height1Left =   3.6;
 162   Float_t   height2Left =   6.4;
 163   Float_t   height3Left =  14.9;
 164   Float_t   height4Left =  14.4;
 165   Float_t   heightLeft  =   height1Left + height2Left + height3Left + height4Left;
 166
 167   Float_t   r4Left      =   r0Left  + heightLeft;
 168
 169   partubs[0]     =  r0Left;
 170   partubs[1]     =  r4Left;
 171   partubs[2]     =  fThickness1/2.0;
 172   partubs[3]     =  90.0-15.0;
 173   partubs[4]     = 120.0-15.0;
 174
 175   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
 176
 177   Float_t  r1Left =  r0Left + height1Left;
 178
 179   partubs[0]     =  r0Left;
 180   partubs[1]     =  r1Left;
 181
 182   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
 183   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 184
 185   Float_t  r2Left  =  r1Left + height2Left;
 186
 187   partubs[0]     =  r1Left;
 188   partubs[1]     =  r2Left;
 189
 190   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
 191   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 192
 193   Float_t  r3Left  =  r2Left + height3Left;
 194
 195   partubs[0]     =  r2Left;
 196   partubs[1]     =  r3Left;
 197
 198   gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
 199   gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 200
 201   partubs[0]     =  r3Left;
 202   partubs[1]     =  r4Left;
 203
 204   gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
 205   gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 206
 207 // Creation of mother volume v0RI - right part - :
 208
 209   partube[0] = r0Right - 0.2;
 210   partube[1] = r4Right + 1.0;
 211   partube[2] = fThickness/2.0;
 212
 213   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
 214
 215 // Creation of  carbon lids (3.5 mm thick) to keep v0RI box shut...
 216
 217   Float_t  lidThickness = 0.35;
 218
 219   partube[0] =   r0Right;
 220   partube[1] =   r4Right;
 221   partube[2] =   +lidThickness/2.0;
 222
 223   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3);
 224   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
 225   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
 226
 227 // Creation of aluminum rings to maintain the v0RI pieces ...
 228
 229   partube[0] =   r0Right - 0.2;
 230   partube[1] =   r0Right;
 231   partube[2] =   +fThickness/2.0;
 232
 233   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);
 234   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 235
 236   partube[0] =   r4Right;
 237   partube[1] =   r4Right + 1.0;
 238   partube[2] =   +fThickness/2.0;
 239
 240   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);
 241   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 242
 243 // Mother volume v0R0 in which will be set 4  scintillator cells
 244
 245   partubs[0]      =  r0Right;
 246   partubs[1]      =  r4Right;
 247   partubs[2]      =  fThickness/2.0;
 248   partubs[3]      =  90.0-15.0;
 249   partubs[4]      = 120.0-15.0;
 250
 251   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume
 252
 253 // Elementary cell of ring 1 :
 254 // (cells of ring 1  will be shifted by 1.7 cm towards vertex to output fibers)
 255
 256   Float_t   offsetFibers  =  1.7;
 257   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0;
 258   Float_t   r1Right       =  r0Right + height1Right;
 259
 260   partubs[0]     =  r0Right;
 261   partubs[1]     =  r1Right;
 262   partubs[2]     =  fThickness1/2.0;
 263
 264   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 265   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY");
 266
 267 // Elementary cell of ring 2 :
 268
 269   Float_t   r2Right   =  r1Right + height2Right;
 270
 271   partubs[0]     =  r1Right;
 272   partubs[1]     =  r2Right;
 273
 274   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 275   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 276
 277
 278 // Elementary cell of ring 3 :
 279
 280   Float_t   r3Right   =  r2Right + height3Right;
 281
 282   partubs[0]     =  r2Right;
 283   partubs[1]     =  r3Right;
 284
 285   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 286   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 287
 288 // Elementary cell of ring 4 :
 289
 290   partubs[0]     =  r3Right;
 291   partubs[1]     =  r4Right;
 292
 293   gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 294   gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 295
 296   Float_t  phiDeg = 180./6.;
 297
 298 // Right 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("V0R0",ndetR,"V0RI",0.0,
 304                           0.0,0.0,idrotm[902],"ONLY");
 305         ndetR++;
 306        }
 307
 308   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
 309
 310   ncellsR = (ndetR - 1) * 4;
 311   AliInfo(Form("Number of cells on Right side =   %d",  ncellsR));
 312
 313 // Left part :
 314
 315   for(Float_t  phi = 15.0 ; phi < 360.0; phi = phi + phiDeg)
 316       {
 317         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 318         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
 319                           0.0,0.0,idrotm[902],"ONLY");
 320         ndetL++;
 321        }
 322
 323   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,350.0+fThickness1/2.0,0,"ONLY");
 324
 325   ncellsL = (ndetL - 1) * 4;
 326   AliInfo(Form("Number of cells on Left side  =   %d",  ncellsL));
 327
 328 }
 329
 330 //_____________________________________________________________________________
 331 void AliVZEROv4::CreateMaterials()
 332 {
 333
 334 // Creates materials used for geometry
 335
 336     AliDebug(2,"VZERO create materials");
 337
 338 /*
 339     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,
 340                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 341
 342
 343     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,
 344                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 345
 346     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458,
 347                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362,
 348                                  1.662295, 1.68337 };
 349
 350     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525,
 351                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };
 352
 353     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 354
 355
 356     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 357
 358
 359     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,
 360                                1e-4,1e-4,1e-4,1e-4 };
 361     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 362
 363 */
 364
 365     Int_t *idtmed = fIdtmed->GetArray()-2999;
 366
 367
 368 //  Parameters related to Quarz (SiO2) :
 369
 370     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
 371     Int_t nlmatqua;
 372
 373     aqua[0]    = 28.09;
 374     aqua[1]    = 16.;
 375     zqua[0]    = 14.;
 376     zqua[1]    = 8.;
 377     densqua    = 2.64;
 378     nlmatqua   = -2;
 379     wmatqua[0] = 1.;
 380     wmatqua[1] = 2.;
 381
 382 // Parameters  related to aluminum sheets :
 383
 384     Float_t  aal   = 26.98;
 385     Float_t  zal   = 13.00;
 386     Float_t  densal=   2.7;
 387     Float_t  radlal=   8.9;
 388
 389 // Parameters  related to scintillator CH :
 390
 391     Float_t ascin[2] = {1.00794,12.011};
 392     Float_t zscin[2] = {1.,6.};
 393     Float_t wscin[2] = {1.,1.};
 394     Float_t denscin  = 1.032;
 395
 396 // AIR
 397
 398     Float_t aAir[4]={12.,14.,16.,36.};
 399     Float_t zAir[4]={6.,7.,8.,18.};
 400     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
 401     Float_t dAir = 1.20479E-3;
 402
 403 //  Definition of materials :
 404
 405 // AIR
 406
 407     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
 408     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
 409     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
 410     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
 411     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
 412     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
 413
 414     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 415
 416
 417     Int_t   iSXFLD = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Integ();     // Field type
 418     Float_t sXMGMX = ((AliMagF*)TGeoGlobalMagField::Instance()->GetField())->Max();       // Field max.
 419
 420     Float_t tmaxfd, stemax, deemax, epsil, stmin;
 421
 422     tmaxfd = 10.;
 423     stemax = 0.1;
 424     deemax = 0.1;
 425     epsil  = 0.001;
 426     stmin  = 0.001;
 427
 428 //  Active Air :
 429     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
 430               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 431
 432 //  Inactive air :
 433
 434     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
 435               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 436
 437     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
 438               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);
 439
 440     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
 441               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
 442
 443     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
 444               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 445
 446
 447     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
 448               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 449
 450     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
 451
 452     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
 453     gMC->Gstpar(idtmed[3000], "HADR", 1.);
 454     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
 455     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
 456
 457     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
 458     gMC->Gstpar(idtmed[3001], "HADR", 1.);
 459     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
 460     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
 461
 462     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
 463     gMC->Gstpar(idtmed[3002], "HADR", 1.);
 464     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
 465     gMC->Gstpar(idtmed[3002], "DRAY", 1.);
 466     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ;
 467     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
 468
 469     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
 470     gMC->Gstpar(idtmed[3003], "HADR", 1.);
 471     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
 472     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
 473
 474     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
 475     gMC->Gstpar(idtmed[3004], "HADR", 1.);
 476     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
 477     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
 478     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ;
 479     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
 480
 481     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
 482     gMC->Gstpar(idtmed[3005], "HADR", 1.);
 483     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
 484     gMC->Gstpar(idtmed[3005], "DRAY", 1.);
 485     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ;
 486     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
 487
 488
 489 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 490 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 491
 492 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 493 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 494
 495 }
 496
 497 //_____________________________________________________________________________
 498 void AliVZEROv4::DrawModule() const
 499 {
 500
 501 //  Drawing is done in DrawVZERO.C
 502
 503    AliDebug(2,"VZERO DrawModule");
 504 }
 505
 506 //_____________________________________________________________________________
 507 void AliVZEROv4::Init()
 508 {
 509 // Initialises version 2 of the VZERO Detector
 510 // Just prints an information message
 511
 512   AliDebug(2,Form("VZERO version %d initialized",IsVersion()));
 513
 514 //   gMC->SetMaxStep(fMaxStepAlu);
 515 //   gMC->SetMaxStep(fMaxStepQua);
 516
 517     AliVZERO::Init();
 518 }
 519
 520 //_____________________________________________________________________________
 521 void AliVZEROv4::StepManager()
 522 {
 523
 524 // Step Manager, called at each step
 525
 526      Int_t     copy;
 527      static    Int_t   vol[4];
 528      static    Float_t hits[21];
 529      static    Float_t eloss, tlength;
 530      static    Int_t   nPhotonsInStep;
 531      static    Int_t   nPhotons;
 532      static    Int_t   numStep;
 533      Float_t   ringNumber;
 534      Float_t   destep, step;
 535
 536      numStep += 1;
 537
 538 //   We keep only charged tracks :
 539
 540      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return;
 541
 542      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
 543      vol[2]    = gMC->CurrentVolID(copy);
 544      vol[3]    = copy;
 545
 546      static Int_t idV0R1 = gMC->VolId("V0R1");
 547      static Int_t idV0L1 = gMC->VolId("V0L1");
 548      static Int_t idV0R2 = gMC->VolId("V0R2");
 549      static Int_t idV0L2 = gMC->VolId("V0L2");
 550      static Int_t idV0R3 = gMC->VolId("V0R3");
 551      static Int_t idV0L3 = gMC->VolId("V0L3");
 552      static Int_t idV0R4 = gMC->VolId("V0R4");
 553      static Int_t idV0L4 = gMC->VolId("V0L4");
 554
 555      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
 556                gMC->CurrentVolID(copy) == idV0L1 )
 557                ringNumber = 1.0;
 558      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
 559                gMC->CurrentVolID(copy) == idV0L2 )
 560                ringNumber = 2.0;
 561      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
 562                gMC->CurrentVolID(copy) == idV0L3 )
 563                ringNumber = 3.0;
 564      else if ( gMC->CurrentVolID(copy) == idV0R4 ||
 565                gMC->CurrentVolID(copy) == idV0L4 )
 566                ringNumber = 4.0;
 567      else
 568                ringNumber = 0.0;
 569
 570      if  (  ringNumber > 0.5  ) {
 571
 572         destep    = gMC->Edep();
 573         step      = gMC->TrackStep();
 574
 575         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) );
 576         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
 577
 578         eloss    += destep;
 579         tlength  += step;
 580
 581         if  ( gMC->IsTrackEntering()  )  {
 582
 583             nPhotons  =  nPhotonsInStep;
 584             gMC->TrackPosition(fTrackPosition);
 585             gMC->TrackMomentum(fTrackMomentum);
 586
 587             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
 588                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
 589
 590             hits[0]  = fTrackPosition.X();
 591             hits[1]  = fTrackPosition.Y();
 592             hits[2]  = fTrackPosition.Z();
 593             hits[3]  = Float_t (gMC->TrackPid());
 594
 595             hits[4]  = gMC->TrackTime();
 596             hits[5]  = gMC->TrackCharge();
 597             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
 598             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
 599             hits[8]  = ringNumber;
 600
 601             hits[9]  = pt;
 602             hits[10] = fTrackMomentum.P();
 603             hits[11] = fTrackMomentum.Px();
 604             hits[12] = fTrackMomentum.Py();
 605             hits[13] = fTrackMomentum.Pz();
 606
 607             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
 608             hits[14] = par->Vx();
 609             hits[15] = par->Vy();
 610             hits[16] = par->Vz();
 611
 612             tlength  = 0.0;
 613             eloss    = 0.0;
 614          }
 615
 616          nPhotons  = nPhotons + nPhotonsInStep;
 617
 618          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
 619
 620          nPhotons  = nPhotons - Int_t((Float_t(nPhotons) * fLightAttenuation * fnMeters));
 621          nPhotons  = nPhotons - Int_t( Float_t(nPhotons) * fFibToPhot);
 622
 623          hits[17] =   eloss;
 624          hits[18] = tlength;
 625          hits[19] = nPhotons;
 626          hits[20] = GetCellId (vol, hits);
 627
 628          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
 629
 630          tlength         = 0.0;
 631          eloss           = 0.0;
 632          nPhotons        =   0;
 633          nPhotonsInStep  =   0;
 634
 635          numStep         =   0;
 636          }
 637     }
 638
 639 }
 640
 641 //_____________________________________________________________________________
 642 void AliVZEROv4::AddHit(Int_t track, Int_t *vol, Float_t *hits)
 643 {
 644
 645 //  Adds a VZERO hit
 646
 647   TClonesArray &lhits = *fHits;
 648   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
 649 }
 650
 651 //_____________________________________________________________________________
 652 void AliVZEROv4::AddDigits(Int_t *tracks, Int_t* digits)
 653 {
 654
 655 //  Adds a VZERO digit
 656
 657    TClonesArray  &ldigits = *fDigits;
 658    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
 659 }
 660
 661 //_____________________________________________________________________________
 662 void AliVZEROv4::MakeBranch(Option_t *option)
 663 {
 664
 665 // Creates new branches in the current Root Tree
 666
 667   char branchname[10];
 668   sprintf(branchname,"%s",GetName());
 669   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
 670
 671   const char *cH = strstr(option,"H");
 672
 673   if (fHits   && fLoader->TreeH() && cH) {
 674     fLoader->TreeH()->Branch(branchname,&fHits, fBufferSize);
 675     AliDebug(2,Form("Making Branch %s for hits",branchname));
 676   }
 677
 678   const char *cD = strstr(option,"D");
 679
 680   if (fDigits   && fLoader->TreeD() && cD) {
 681     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
 682     AliDebug(2,Form("Making Branch %s for digits",branchname));
 683   }
 684
 685 }
 686
 687 //_____________________________________________________________________________
 688 Int_t AliVZEROv4::GetCellId(Int_t *vol, Float_t *hits)
 689 {
 690
 691   //   Returns Id of scintillator cell
 692   //   Right side from  0 to 47
 693   //   Left  side from 48 to 95
 694
 695    Int_t index = vol[1];
 696    fCellId     = 0;
 697
 698    if (index < 10) index = index + 12;
 699
 700    if (hits[2] < 0.0) {
 701       index = (index - 10) + ( ( Int_t(hits[8]) - 1 ) * 12);
 702       fCellId   = index;
 703    }
 704    else if (hits[2] > 0.0)
 705    {
 706       index = (index + 38) + ( ( Int_t(hits[8]) - 1 ) * 12);
 707       fCellId   = index;}
 708
 709    return fCellId;
 710 }