VZERO/AliVZEROv5.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
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  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
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  15
  16 /* $Id$ */
  17
  18 //////////////////////////////////////////////////////////////////////
  19 //                                                                  //
  20 //  (V-zero) detector  version 5  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  16 th of june 2004                            //
  24 //  (now 8 sectors instead of 12 sectors as in previous version)    //
  25 //   V0R (now V0C) sits between Z values  -89.6 and  -84.9 cm       //
  26 //   V0L (now V0A) sits between Z values +339.0 and +341.0 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 <TGeometry.h>
  39 #include <TLorentzVector.h>
  40 #include <TMath.h>
  41 #include <TNode.h>
  42 #include <TObjectTable.h>
  43 #include <TTUBE.h>
  44 #include <TTUBS.h>
  45 #include <TVirtualMC.h>
  46 #include <TParticle.h>
  47
  48 // --- AliRoot header files ---
  49 #include "AliRun.h"
  50 #include "AliMC.h"
  51 #include "AliConst.h"
  52 #include "AliMagF.h"
  53 #include "AliVZEROLoader.h"
  54 #include "AliVZEROdigit.h"
  55 #include "AliVZEROhit.h"
  56 #include "AliVZEROv5.h"
  57 #include "AliLog.h"
  58
  59 ClassImp(AliVZEROv5)
  60
  61 //_____________________________________________________________________________
  62 AliVZEROv5:: AliVZEROv5():AliVZERO()
  63 {
  64 // Standard default constructor
  65 }
  66
  67 //_____________________________________________________________________________
  68 AliVZEROv5::AliVZEROv5(const char *name, const char *title):
  69  AliVZERO(name,title)
  70 {
  71
  72 // Standard constructor for V-zero Detector  version 5
  73
  74   AliDebug(2,"Create VZERO object ");
  75
  76   fLightYield              =  93.75; // Light yield in BC408 (93.75 eV per photon)
  77   fLightAttenuation        =   0.05; // Light attenuation in fiber (0.05 per meter)
  78   fnMeters                 =   15.0; // Number of meters of clear fibers to PM
  79   fFibToPhot               =    0.3; // Attenuation at fiber-photocathode interface
  80 }
  81
  82 //_____________________________________________________________________________
  83 void AliVZEROv5::CreateGeometry()
  84 {
  85
  86 // Creates the GEANT geometry of the V-zero Detector  version 5
  87
  88   AliDebug(2,"Create Geometry ");
  89
  90   Int_t    *idtmed = fIdtmed->GetArray()-2999;
  91
  92   Int_t    ndetR = 1;
  93   Int_t    ndetL = 1;
  94
  95   Int_t    ncellsR = 1;
  96   Int_t    ncellsL = 1;
  97
  98   Int_t    idrotm[999];
  99
 100   Float_t  height1Right, height2Right, height3Right, height4Right;
 101   Float_t  heightRight;
 102   Float_t  theta;
 103
 104   Float_t  halfThickQua;
 105
 106   Float_t  zdet;
 107   Float_t  r0Right, r4Right, rBoxRight;
 108   Float_t  pi = TMath::Pi();
 109
 110   height1Right    =     2.6;  // height of cell 1, in cm
 111   height2Right    =     4.6;  // height of cell 2, in cm
 112   height3Right    =     7.6;  // height of cell 3, in cm
 113   height4Right    =    12.7;  // height of cell 4, in cm
 114
 115   theta       = pi/4.0/2.0;       // half angular opening = 22.5 degrees
 116
 117   halfThickQua= fThickness1/2.0;  // half thickness of elementary cell (inner ring)
 118
 119 // distance 0.6 cm in zdet accounts for the fact V0R box back lid sits 0.6 away from
 120 // absorber nose sitting at 90 cm. Will use -zdet later...
 121 // size of V0R box (fThickness) is increased by 3 mm as compared to basic version
 122
 123   fThickness  =    fThickness + 0.3;             // now 4.7 cm instead of 4.4 cm
 124   zdet        =    90.0 - 0.6 - fThickness/2.0;  // distance to vertex (along Z axis)
 125   r0Right     =    4.20;          // closest distance to center of the beam pipe
 126   heightRight =    height1Right + height2Right + height3Right + height4Right;
 127   r4Right     =    r0Right + heightRight + 0.3;
 128   rBoxRight   =    38.0;          // external radius of right box
 129
 130 // Creation of mother volume v0LE - left part - :
 131 // Entrance face at  +339.0 cm  (new coordinate system) ...
 132
 133    Float_t   partube[3];
 134
 135    partube[0] =  4.3;
 136    partube[1] = 44.0;
 137    partube[2] = fThickness1/2.0;
 138
 139    gMC->Gsvolu("V0LE","TUBE",idtmed[3005],partube,3);
 140
 141 // Creation of five rings - left part - :
 142 // Entrance face at +339.0 cm  (new coordinate system) ...
 143
 144 // Mother volume v0L0 in which will be set 5 scintillator cells
 145
 146   Float_t   partubs[5];
 147
 148   Float_t   r0Left      =   4.3;
 149   Float_t   height1Left =   3.3;
 150   Float_t   height2Left =   6.2;
 151   Float_t   height3Left =   8.9;
 152   Float_t   height4Left =  20.9;
 153   Float_t   heightLeft  =   height1Left + height2Left + height3Left + height4Left;
 154
 155   Float_t   r4Left      =   r0Left  + heightLeft;
 156
 157   partubs[0]     =  r0Left;
 158   partubs[1]     =  r4Left;
 159   partubs[2]     =  fThickness1/2.0;
 160   partubs[3]     =  90.0-22.5;
 161   partubs[4]     = 135.0-22.5;
 162
 163   gMC->Gsvolu("V0L0","TUBS",idtmed[3010],partubs,5);  // air volume
 164
 165   Float_t  r1Left =  r0Left + height1Left;
 166
 167   partubs[0]     =  r0Left;
 168   partubs[1]     =  r1Left;
 169
 170   gMC->Gsvolu("V0L1","TUBS",idtmed[3005],partubs,5);  // quartz volume
 171   gMC->Gspos("V0L1",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 172
 173   Float_t  r2Left  =  r1Left + height2Left;
 174
 175   partubs[0]     =  r1Left;
 176   partubs[1]     =  r2Left;
 177
 178   gMC->Gsvolu("V0L2","TUBS",idtmed[3005],partubs,5);  // quartz volume
 179   gMC->Gspos("V0L2",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 180
 181   Float_t  r3Left  =  r2Left + height3Left;
 182
 183   partubs[0]     =  r2Left;
 184   partubs[1]     =  r3Left;
 185
 186   gMC->Gsvolu("V0L3","TUBS",idtmed[3005],partubs,5);  // quartz volume
 187   gMC->Gspos("V0L3",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 188
 189   partubs[0]     =  r3Left;
 190   partubs[1]     =  r4Left;
 191
 192   gMC->Gsvolu("V0L4","TUBS",idtmed[3005],partubs,5);  // quartz volume
 193   gMC->Gspos("V0L4",1,"V0L0", 0.0, 0.0 , 0.0, 0,"ONLY");
 194
 195 // Creation of mother volume v0RI - right part - :
 196
 197   partube[0] = r0Right - 0.2;
 198   partube[1] = r4Right + 1.0;
 199   partube[2] = fThickness/2.0;
 200
 201   gMC->Gsvolu("V0RI","TUBE",idtmed[3010],partube,3);
 202
 203 // Creation of  carbon lids (3.0 mm thick) to keep v0RI box shut...
 204
 205   Float_t  lidThickness = 0.30;
 206
 207   partube[0] =   r0Right;
 208   partube[1] =   rBoxRight;
 209   partube[2] =   +lidThickness/2.0;
 210
 211   gMC->Gsvolu("V0CA","TUBE",idtmed[3001],partube,3);
 212   gMC->Gspos("V0CA",1,"V0RI",0.0,0.0, fThickness/2.0-partube[2],0,"ONLY");
 213   gMC->Gspos("V0CA",2,"V0RI",0.0,0.0,-fThickness/2.0+partube[2],0,"ONLY");
 214
 215 // Creation of aluminum rings 3.0 mm thick to maintain the v0RI pieces ...
 216
 217   partube[0] =   r0Right;
 218   partube[1] =   r0Right + 0.3;
 219   partube[2] =   +fThickness/2.0;
 220
 221   gMC->Gsvolu("V0IR","TUBE",idtmed[3003],partube,3);
 222   gMC->Gspos("V0IR",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 223
 224   partube[0] =   rBoxRight - 0.3;
 225   partube[1] =   rBoxRight;
 226   partube[2] =   +fThickness/2.0;
 227
 228   gMC->Gsvolu("V0ER","TUBE",idtmed[3003],partube,3);
 229   gMC->Gspos("V0ER",1,"V0RI",0.0,0.0,0.0,0,"ONLY");
 230
 231 // Mother volume v0R0 in which will be set 6 scintillator cells
 232
 233   partubs[0]      =  r0Right;
 234   partubs[1]      =  r4Right;
 235   partubs[2]      =  fThickness/2.0;
 236   partubs[3]      =  90.0-22.5;
 237   partubs[4]      = 135.0-22.5;
 238
 239   gMC->Gsvolu("V0R0","TUBS",idtmed[3010],partubs,5);  // air volume
 240
 241 // Elementary cell of ring 1 :
 242 // (cells of ring 1 will be shifted by 2.0 cm backwards to output fibers)
 243
 244   Float_t   offsetFibers  =  1.0;
 245   Float_t   offset        =  fThickness/2.0 - lidThickness - fThickness1/2.0;
 246   Float_t   r1Right       =  r0Right + 0.3 + height1Right;
 247
 248   partubs[0]     =  r0Right + 0.3;
 249   partubs[1]     =  r1Right;
 250   partubs[2]     =  fThickness1/2.0;
 251
 252   gMC->Gsvolu("V0R1","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 253   gMC->Gspos("V0R1",1,"V0R0", 0.0, 0.0 , -offset, 0,"ONLY");
 254
 255 // Elementary cell of ring 2 :
 256 // (cells of ring 2 will be shifted by 1.0 cm backwards to output fibers)
 257
 258   Float_t   r2Right   =  r1Right + height2Right;
 259
 260   partubs[0]     =  r1Right;
 261   partubs[1]     =  r2Right;
 262
 263   gMC->Gsvolu("V0R2","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 264   gMC->Gspos("V0R2",1,"V0R0", 0.0, 0.0 , -offset + offsetFibers, 0,"ONLY");
 265
 266 // Elementary cell of ring 3 :
 267
 268   Float_t   r3Right   =  r2Right + height3Right;
 269
 270   partubs[0]     =  r2Right;
 271   partubs[1]     =  r3Right;
 272   partubs[3]     =  90.0-22.5;
 273   partubs[4]     = 112.5-22.5;
 274
 275   gMC->Gsvolu("V0R3","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 276   gMC->Gspos("V0R3",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
 277
 278   partubs[3]     = 112.5-22.5;
 279   partubs[4]     = 135.0-22.5;
 280   gMC->Gsvolu("V0R4","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 281   gMC->Gspos("V0R4",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
 282
 283 // Elementary cell of ring 4 :
 284
 285   partubs[0]     =  r3Right;
 286   partubs[1]     =  r4Right;
 287   partubs[3]     =  90.0-22.5;
 288   partubs[4]     = 112.5-22.5;
 289
 290   gMC->Gsvolu("V0R5","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 291   gMC->Gspos("V0R5",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
 292
 293   partubs[3]     = 112.5-22.5;
 294   partubs[4]     = 135.0-22.5;
 295   gMC->Gsvolu("V0R6","TUBS",idtmed[3005],partubs,5);  // scintillator volume
 296   gMC->Gspos("V0R6",1,"V0R0", 0.0, 0.0 , -offset + 2.0 * offsetFibers, 0,"ONLY");
 297
 298   Float_t  phiDeg = 180./4.;
 299
 300 // Right part :
 301
 302   for(Float_t  phi = 22.5; phi < 360.0; phi = phi + phiDeg)
 303       {
 304         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 305         gMC->Gspos("V0R0",ndetR,"V0RI",0.0,
 306                           0.0,0.0,idrotm[902],"ONLY");
 307         ndetR++;
 308        }
 309
 310   gMC->Gspos("V0RI",1,"ALIC",0.0,0.0,-zdet,0,"ONLY");
 311
 312   ncellsR = (ndetR - 1) * 6;
 313   AliInfo(Form("Number of cells on Right side =   %d\n",  ncellsR));
 314
 315 // Left part :
 316
 317   for(Float_t  phi = 22.5; phi < 360.0; phi = phi + phiDeg)
 318       {
 319         AliMatrix(idrotm[902], 90.0, phi, 90.0, 90.0 +phi, 0.0 , 0.0);
 320         gMC->Gspos("V0L0",ndetL,"V0LE",0.0,
 321                           0.0,0.0,idrotm[902],"ONLY");
 322         ndetL++;
 323        }
 324
 325   gMC->Gspos("V0LE",1,"ALIC",0.0,0.0,339.0+fThickness1/2.0,0,"ONLY");
 326
 327   ncellsL = (ndetL - 1) * 4;
 328   AliInfo(Form("Number of cells on Left side  =   %d\n",  ncellsL));
 329
 330 }
 331
 332 //_____________________________________________________________________________
 333 void AliVZEROv5::BuildGeometry()
 334 {
 335
 336 // Builds simple ROOT TNode geometry for event display
 337
 338   AliDebug(2,"VZERO BuildGeometry");
 339
 340   TNode *top;
 341
 342   TNode *v0Rnode,  *v0Rnode0, *v0Rnode7, *v0Rnode8, *v0Rnode9, *v0Rnode10;
 343   TNode *v0Rnode1, *v0Rnode2, *v0Rnode3, *v0Rnode4, *v0Rnode5, *v0Rnode6;
 344   TNode *v0Lnode, *v0Lnode0;
 345   TNode *v0Lnode1, *v0Lnode2, *v0Lnode3, *v0Lnode4;
 346
 347   const int kColorVZERO  = kGreen;
 348
 349   top = gAlice->GetGeometry()->GetNode("alice");
 350
 351   Float_t  height1Right, height2Right, height3Right, height4Right;
 352   Float_t  heightRight;
 353   Float_t  theta;
 354
 355   Float_t  halfThickQua;
 356   Float_t  zdet;
 357   Float_t  r0Right, r4Right, rBoxRight;
 358   Float_t  pi = TMath::Pi();
 359
 360   height1Right      =     2.6;  // height of cell 1, in cm
 361   height2Right      =     4.6;  // height of cell 2, in cm
 362   height3Right      =     7.6;  // height of cell 3, in cm
 363   height4Right      =    12.7;  // height of cell 4, in cm
 364
 365   theta             =    pi/4.0/2.0;
 366
 367   halfThickQua      =    fThickness1/2.0;
 368
 369   zdet              =    90.0 - 0.6 - fThickness/2.0;
 370   r0Right           =    4.20;
 371   heightRight       =    height1Right + height2Right + height3Right + height4Right;
 372   r4Right           =    r0Right + heightRight + 0.3;
 373   rBoxRight         =    38.0;
 374
 375   Int_t     ndiv    =     1;
 376
 377   Float_t   partube[3];
 378
 379   partube[0] =  r0Right - 0.2;
 380   partube[1] =  r4Right + 1.0;
 381   partube[2] = fThickness/2.0;
 382
 383   TTUBE *v0RI = new TTUBE("V0RI", "V0RI", "void", partube[0], partube[1], partube[2]);
 384
 385   top->cd();
 386
 387   v0Rnode = new TNode("V0RI","V0RI",v0RI,0.0,0.0,-zdet,0);
 388
 389   v0Rnode->SetLineColor(kYellow);
 390   fNodes->Add(v0Rnode);
 391   v0Rnode->SetVisibility(2);
 392
 393 // Rondelles de carbone (epaisseur 3.0 mm) de maintien des cellules ...
 394
 395   Float_t  lidThickness = 0.30;
 396
 397   partube[0] =   r0Right;
 398   partube[1] =   rBoxRight;
 399   partube[2] =   +lidThickness/2.0;
 400
 401   TTUBE  *v0CA = new TTUBE("V0CA", "V0CA", "void",partube[0], partube[1], partube[2]);
 402
 403   v0Rnode->cd();
 404   v0Rnode7 = new TNode("V0CA", "V0CA",v0CA,0.0,0.0, fThickness/2.0-partube[2],0);
 405   v0Rnode7->SetLineColor(kYellow);
 406   fNodes->Add(v0Rnode7);
 407   v0Rnode->cd();
 408   v0Rnode8 = new TNode("V0CA", "V0CA",v0CA,0.0,0.0,-fThickness/2.0+partube[2],0);
 409   v0Rnode8->SetLineColor(kYellow);
 410   fNodes->Add(v0Rnode8);
 411
 412   partube[0] =   r0Right;
 413   partube[1] =   r0Right + 0.3;
 414   partube[2] =   +fThickness/2.0;
 415
 416   TTUBE *v0IR = new TTUBE("V0IR","V0IR","void", partube[0], partube[1], partube[2]);
 417
 418   v0Rnode->cd();
 419   v0Rnode9 = new TNode("V0IR", "V0IR",v0IR,0.0,0.0,0.0,0);
 420   v0Rnode9->SetLineColor(kYellow);
 421   fNodes->Add(v0Rnode9);
 422
 423   partube[0] =   rBoxRight - 0.3;
 424   partube[1] =   rBoxRight;
 425   partube[2] =   +fThickness/2.0;
 426
 427   TTUBE  *v0ER = new TTUBE("V0ER","V0ER","void", partube[0], partube[1], partube[2]);
 428
 429   v0Rnode->cd();
 430   v0Rnode10 = new TNode("V0ER", "V0ER",v0ER,0.0,0.0,0.0,0);
 431   v0Rnode10->SetLineColor(kYellow);
 432   fNodes->Add(v0Rnode10);
 433
 434   Float_t   partubs[5];
 435
 436   partubs[0]      =  r0Right;
 437   partubs[1]      =  r4Right;
 438   partubs[2]      =  fThickness/2.0;
 439   partubs[3]      =  90.0-22.5;
 440   partubs[4]      = 135.0-22.5;
 441
 442   TTUBS  *v0R0 = new TTUBS("V0R0", "V0R0", "void",partubs[0], partubs[1], partubs[2],
 443                                                   partubs[3], partubs[4]);
 444
 445   v0R0->SetNumberOfDivisions(ndiv);
 446
 447   Float_t   r1Right =  r0Right + 0.3 + height1Right;
 448   Float_t   offset  = fThickness/2.0 - lidThickness - fThickness1/2.0;
 449   Float_t   offsetFibers = 1.0;
 450
 451   partubs[0]     =  r0Right + 0.3;
 452   partubs[1]     =  r1Right;
 453   partubs[2]     =  fThickness1/2.0;
 454
 455   TTUBS *v0R1 = new TTUBS("V0R1", "V0R1", "void", partubs[0], partubs[1], partubs[2],
 456                                                   partubs[3], partubs[4]);
 457
 458   v0R1->SetNumberOfDivisions(ndiv);
 459
 460   Float_t   r2Right  =  r1Right + height2Right;
 461
 462   partubs[0]     =  r1Right;
 463   partubs[1]     =  r2Right;
 464
 465   TTUBS *v0R2 = new TTUBS("V0R2", "V0R2", "void", partubs[0], partubs[1], partubs[2],
 466                                                   partubs[3], partubs[4]);
 467
 468   v0R2->SetNumberOfDivisions(ndiv);
 469
 470 // Ring 3 :
 471
 472   Float_t   r3Right  =  r2Right + height3Right;
 473
 474   partubs[0]     =  r2Right;
 475   partubs[1]     =  r3Right;
 476   partubs[3]     =  90.0-22.5;
 477   partubs[4]     = 112.5-22.5;
 478
 479   TTUBS *v0R3 = new TTUBS("V0R3", "V0R3", "void", partubs[0], partubs[1], partubs[2],
 480                                                   partubs[3], partubs[4]);
 481   v0R3->SetNumberOfDivisions(ndiv);
 482
 483   partubs[3]     = 112.5-22.5;
 484   partubs[4]     = 135.0-22.5;
 485
 486   TTUBS *v0R4 = new TTUBS("V0R4", "V0R4", "void", partubs[0], partubs[1], partubs[2],
 487                                                   partubs[3], partubs[4]);
 488   v0R4->SetNumberOfDivisions(ndiv);
 489
 490 // Ring 4 :
 491
 492   partubs[0]     =  r3Right;
 493   partubs[1]     =  r4Right;
 494   partubs[3]     =  90.0-22.5;
 495   partubs[4]     = 112.5-22.5;
 496
 497   TTUBS *v0R5 = new TTUBS("V0R5", "V0R5", "void", partubs[0], partubs[1], partubs[2],
 498                                                   partubs[3], partubs[4]);
 499   v0R5->SetNumberOfDivisions(ndiv);
 500
 501   partubs[3]     = 112.5-22.5;
 502   partubs[4]     = 135.0-22.5;
 503
 504   TTUBS *v0R6 = new TTUBS("V0R6", "V0R6", "void", partubs[0], partubs[1], partubs[2],
 505                                                   partubs[3], partubs[4]);
 506   v0R6->SetNumberOfDivisions(ndiv);
 507
 508   Float_t  phi;
 509   Float_t  phiDeg= 180./4.;
 510
 511   Int_t    ndetR = 1;
 512
 513   char     nameNode[12];
 514
 515   for (phi = 22.5; phi < 360.0; phi = phi + phiDeg)
 516
 517   {
 518     TRotMatrix* mat920 = new TRotMatrix("rot920","rot920", 90.0, +phi, 90., 90.+phi, 0.0, 0.0 );
 519
 520     sprintf(nameNode,"SUBDER%d",ndetR);
 521
 522     v0Rnode->cd();
 523     v0Rnode0 = new TNode(nameNode,nameNode,v0R0,0.0,0.0, 0.0,mat920);
 524     v0Rnode0->SetLineColor(kYellow);
 525     fNodes->Add(v0Rnode0);
 526     ndetR++;
 527
 528     sprintf(nameNode,"SUBDER%d",ndetR);
 529     v0Rnode0->cd();
 530     v0Rnode1 = new TNode(nameNode,nameNode,v0R1,0.0,0.0, -offset ,0);
 531     v0Rnode1->SetLineColor(kColorVZERO);
 532     fNodes->Add(v0Rnode1);
 533     ndetR++;
 534
 535     sprintf(nameNode,"SUBDER%d",ndetR);
 536     v0Rnode0->cd();
 537     v0Rnode2 = new TNode(nameNode,nameNode,v0R2,0.0,0.0, -offset + offsetFibers,0);
 538     v0Rnode2->SetLineColor(kColorVZERO);
 539     fNodes->Add(v0Rnode2);
 540     ndetR++;
 541
 542     sprintf(nameNode,"SUBDER%d",ndetR);
 543     v0Rnode0->cd();
 544     v0Rnode3 = new TNode(nameNode,nameNode,v0R3,0.0,0.0, -offset + 2.0*offsetFibers,0);
 545     v0Rnode3->SetLineColor(kColorVZERO);
 546     fNodes->Add(v0Rnode3);
 547     ndetR++;
 548
 549     sprintf(nameNode,"SUBDER%d",ndetR);
 550     v0Rnode0->cd();
 551     v0Rnode4 = new TNode(nameNode,nameNode,v0R4,0.0,0.0, -offset + 2.0*offsetFibers,0);
 552     v0Rnode4->SetLineColor(kColorVZERO);
 553     fNodes->Add(v0Rnode4);
 554     ndetR++;
 555
 556     sprintf(nameNode,"SUBDER%d",ndetR);
 557     v0Rnode0->cd();
 558     v0Rnode5 = new TNode(nameNode,nameNode,v0R5,0.0,0.0, -offset + 2.0*offsetFibers,0);
 559     v0Rnode5->SetLineColor(kColorVZERO);
 560     fNodes->Add(v0Rnode5);
 561     ndetR++;
 562
 563     sprintf(nameNode,"SUBDER%d",ndetR);
 564     v0Rnode0->cd();
 565     v0Rnode6 = new TNode(nameNode,nameNode,v0R6,0.0,0.0, -offset + 2.0*offsetFibers,0);
 566     v0Rnode6->SetLineColor(kColorVZERO);
 567     fNodes->Add(v0Rnode6);
 568     ndetR++;
 569
 570     v0Rnode0->SetVisibility(2);
 571   }
 572
 573 // Left side of VZERO :
 574
 575   Float_t   r0Left      =    4.3;
 576   Float_t   height1Left =    3.3;
 577   Float_t   height2Left =    6.2;
 578   Float_t   height3Left =    8.9;
 579   Float_t   height4Left =   20.9;
 580   Float_t   heightLeft  = height1Left + height2Left + height3Left + height4Left;
 581
 582   Float_t   r4Left      = r0Left  + heightLeft;
 583
 584   partube[0] =  r0Left;
 585   partube[1] =  r4Left;
 586   partube[2] =  fThickness1/2.0;
 587
 588   TTUBE *v0LE = new TTUBE("V0LE", "V0LE", "void", partube[0], partube[1], partube[2]);
 589
 590   top->cd();
 591
 592   v0Lnode = new TNode("V0LE","V0LE",v0LE,0.0,0.0,339.0+fThickness1/2.0,0);
 593
 594   v0Lnode->SetLineColor(kBlue);
 595   fNodes->Add(v0Lnode);
 596
 597   v0Lnode->SetVisibility(2);
 598
 599   partubs[0]      =  r0Left;
 600   partubs[1]      =  r4Left;
 601   partubs[2]      =  fThickness1/2.0;
 602   partubs[3]      =  90.0-22.5;
 603   partubs[4]      = 135.0-22.5;
 604
 605   TTUBS *v0L0 = new TTUBS("V0L0", "V0L0", "void", partubs[0], partubs[1], partubs[2],
 606                                                   partubs[3], partubs[4]);
 607
 608   v0L0->SetNumberOfDivisions(ndiv);
 609   v0L0->SetLineColor(7);
 610
 611   Float_t   offsetLeft;
 612   offsetLeft    = - fThickness1/2.0;
 613
 614   Float_t   r1Left =  r0Left + height1Left;
 615
 616   partubs[0]     =  r0Left;
 617   partubs[1]     =  r1Left;
 618
 619   TTUBS *v0L1 = new TTUBS("V0L1", "V0L1", "void", partubs[0], partubs[1], partubs[2],
 620                                                   partubs[3], partubs[4]);
 621   v0L1->SetNumberOfDivisions(ndiv);
 622
 623   Float_t   r2Left =  r1Left + height2Left;
 624
 625   partubs[0]     =  r1Left;
 626   partubs[1]     =  r2Left;
 627
 628   TTUBS *v0L2 = new TTUBS("V0L2", "V0L2", "void", partubs[0], partubs[1], partubs[2],
 629                                                   partubs[3], partubs[4]);
 630   v0L2->SetNumberOfDivisions(ndiv);
 631
 632   Float_t   r3Left =  r2Left + height3Left;
 633
 634   partubs[0]     =  r2Left;
 635   partubs[1]     =  r3Left;
 636
 637   TTUBS *v0L3 = new TTUBS("V0L3", "V0L3", "void", partubs[0], partubs[1], partubs[2],
 638                                                   partubs[3], partubs[4]);
 639   v0L3->SetNumberOfDivisions(ndiv);
 640
 641   partubs[0]     =  r3Left;
 642   partubs[1]     =  r4Left;
 643
 644   TTUBS *v0L4 = new TTUBS("V0L4", "V0L4", "void", partubs[0], partubs[1], partubs[2],
 645                                                   partubs[3], partubs[4]);
 646   v0L4->SetNumberOfDivisions(ndiv);
 647
 648   Int_t    ndetL   = 1;
 649
 650   for (phi = 22.5; phi < 360.0; phi = phi + phiDeg)
 651
 652   {
 653
 654     TRotMatrix* mat920 = new TRotMatrix("rot920","rot920", 90.0, +phi, 90., 90.+phi, 0.0, 0.0 );
 655
 656     sprintf(nameNode,"SUBDEL%d",ndetL);
 657
 658     v0Lnode->cd();
 659     v0Lnode0 = new TNode(nameNode,nameNode,v0L0,0.0,0.0, offsetLeft + halfThickQua,mat920);
 660     v0Lnode0->SetLineColor(kColorVZERO);
 661     fNodes->Add(v0Lnode0);
 662     ndetL++;
 663
 664     sprintf(nameNode,"SUBDEL%d",ndetL);
 665     v0Lnode0->cd();
 666     v0Lnode1 = new TNode(nameNode,nameNode,v0L1,0.0,0.0, 0.0,0);
 667     v0Lnode1->SetLineColor(kColorVZERO);
 668     fNodes->Add(v0Lnode1);
 669     ndetL++;
 670
 671     sprintf(nameNode,"SUBDEL%d",ndetL);
 672     v0Lnode0->cd();
 673     v0Lnode2 = new TNode(nameNode,nameNode,v0L2,0.0,0.0, 0.0,0);
 674     v0Lnode2->SetLineColor(kColorVZERO);
 675     fNodes->Add(v0Lnode2);
 676     ndetL++;
 677
 678     sprintf(nameNode,"SUBDEL%d",ndetL);
 679     v0Lnode0->cd();
 680     v0Lnode3 = new TNode(nameNode,nameNode,v0L3,0.0,0.0, 0.0,0);
 681     v0Lnode3->SetLineColor(kColorVZERO);
 682     fNodes->Add(v0Lnode3);
 683     ndetL++;
 684
 685     sprintf(nameNode,"SUBDEL%d",ndetL);
 686     v0Lnode0->cd();
 687     v0Lnode4 = new TNode(nameNode,nameNode,v0L4,0.0,0.0, 0.0,0);
 688     v0Lnode4->SetLineColor(kColorVZERO);
 689     fNodes->Add(v0Lnode4);
 690     ndetL++;
 691
 692     v0Lnode0->SetVisibility(2);
 693   }
 694 }
 695
 696 //_____________________________________________________________________________
 697 void AliVZEROv5::CreateMaterials()
 698 {
 699
 700 // Creates materials used for geometry
 701
 702     AliDebug(2,"Create materials");
 703
 704 /*
 705     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,
 706                            6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 707
 708
 709     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,
 710                                6.9e-9, 7.1e-9, 7.3e-9, 7.5e-9, 7.7e-9, 7.9e-9, 8.1e-9 };
 711
 712     Float_t rindex_quarz[14] = { 1.52398,  1.53090, 1.53835, 1.54641, 1.55513, 1.56458,
 713                                  1.57488,  1.58611, 1.59842, 1.61197, 1.62696, 1.64362,
 714                                  1.662295, 1.68337 };
 715
 716     Float_t absco_quarz[14] = { 105.8,  45.656, 35.665, 28.598, 25.007, 21.04, 17.525,
 717                                 14.177, 9.282, 4.0925, 1.149, 0.3627, 0.1497, 0.05 };
 718
 719     Float_t effic_all[14]   = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 720
 721
 722     Float_t rindex_alu[14] = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 723
 724
 725     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,
 726                                1e-4,1e-4,1e-4,1e-4 };
 727     Float_t effic_alu[14]  = { 1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1.,1. };
 728
 729 */
 730
 731     Int_t *idtmed = fIdtmed->GetArray()-2999;
 732
 733
 734 //  Parameters related to Quarz (SiO2) :
 735
 736     Float_t aqua[2], zqua[2], densqua, wmatqua[2];
 737     Int_t nlmatqua;
 738
 739     aqua[0]    = 28.09;
 740     aqua[1]    = 16.;
 741     zqua[0]    = 14.;
 742     zqua[1]    = 8.;
 743     densqua    = 2.64;
 744     nlmatqua   = -2;
 745     wmatqua[0] = 1.;
 746     wmatqua[1] = 2.;
 747
 748 // Parameters  related to aluminum sheets :
 749
 750     Float_t  aal   = 26.98;
 751     Float_t  zal   = 13.00;
 752     Float_t  densal=   2.7;
 753     Float_t  radlal=   8.9;
 754
 755 // Parameters  related to scintillator CH :
 756
 757     Float_t ascin[2] = {1.00794,12.011};
 758     Float_t zscin[2] = {1.,6.};
 759     Float_t wscin[2] = {1.,1.};
 760     Float_t denscin  = 1.032;
 761
 762 // AIR
 763
 764     Float_t aAir[4]={12.,14.,16.,36.};
 765     Float_t zAir[4]={6.,7.,8.,18.};
 766     Float_t wAir[4]={0.000124,0.755267,0.231781,0.012827};
 767     Float_t dAir = 1.20479E-3;
 768
 769 //  Definition of materials :
 770
 771     AliMixture( 1, "AIR A$", aAir,zAir,dAir,4,wAir);
 772     AliMixture(11, "AIR I$", aAir,zAir,dAir,4,wAir);
 773     AliMaterial( 2, "CARBON$"  , 12.01, 6.0, 2.265, 18.8, 49.9, 0, 0);
 774     AliMixture(  3, "QUA", aqua, zqua, densqua, nlmatqua, wmatqua);
 775     AliMaterial( 4, "ALUMINIUM1$", 26.98, 13., 2.7, 8.9, 37.2, 0, 0);
 776     AliMaterial( 5, "ALUMINIUM2$", aal, zal, densal, radlal, 0, 0, 0);
 777
 778     AliMixture( 6, "Scintillator$",ascin,zscin,denscin,-2,wscin);
 779
 780
 781     Int_t   iSXFLD = gAlice->Field()->Integ();
 782     Float_t sXMGMX = gAlice->Field()->Max();
 783
 784     Float_t tmaxfd, stemax, deemax, epsil, stmin;
 785
 786     tmaxfd = 10.;
 787     stemax = 0.1;
 788     deemax = 0.1;
 789     epsil  = 0.001;
 790     stmin  = 0.001;
 791
 792 //  Active Air :
 793     AliMedium(1, "ACTIVE AIR$", 1, 1, iSXFLD, sXMGMX,
 794               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 795
 796 //  Inactive air :
 797
 798     AliMedium(11, "INACTIVE AIR$", 11, 0, iSXFLD, sXMGMX,
 799               10.0, 1.0, 0.1, 0.1, 10.0, 0, 0) ;
 800
 801     AliMedium(2, "CARBON$ ", 2,  1, iSXFLD, sXMGMX,
 802               tmaxfd, stemax, deemax, epsil, stmin, 0, 0);
 803
 804     AliMedium(3, "QUARZ$", 3, 1, iSXFLD, sXMGMX,
 805               tmaxfd, fMaxStepQua, fMaxDestepQua, epsil, stmin, 0, 0);
 806
 807     AliMedium(4,"ALUMINUM1$",4, 1, iSXFLD, sXMGMX,
 808               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 809
 810
 811     AliMedium(5,"ALUMINUM2$",5, 1, iSXFLD, sXMGMX,
 812               tmaxfd, fMaxStepAlu, fMaxDestepAlu, epsil, stmin, 0, 0);
 813
 814     AliMedium(6,"SCINTILLATOR$",6, 1, iSXFLD, sXMGMX, 10.0, 0.1, 0.1, 0.003, 0.003, 0, 0);
 815
 816     gMC->Gstpar(idtmed[3000], "LOSS", 1.);  //  [3000] = air ACTIF  [3010] = air INACTIF
 817     gMC->Gstpar(idtmed[3000], "HADR", 1.);
 818     gMC->Gstpar(idtmed[3000], "DCAY", 1.);
 819     gMC->Gstpar(idtmed[3000], "DRAY", 1.);
 820
 821     gMC->Gstpar(idtmed[3001], "LOSS", 1.);  //  [3001] = carbon
 822     gMC->Gstpar(idtmed[3001], "HADR", 1.);
 823     gMC->Gstpar(idtmed[3001], "DCAY", 1.);
 824     gMC->Gstpar(idtmed[3001], "DRAY", 1.);
 825
 826     gMC->Gstpar(idtmed[3002], "LOSS", 1.);  //  [3002] = quartz
 827     gMC->Gstpar(idtmed[3002], "HADR", 1.);
 828     gMC->Gstpar(idtmed[3002], "DCAY", 1.);
 829     gMC->Gstpar(idtmed[3002], "DRAY", 1.);
 830     gMC->Gstpar(idtmed[3002], "CUTGAM",0.5E-4) ;
 831     gMC->Gstpar(idtmed[3002], "CUTELE",1.0E-4) ;
 832
 833     gMC->Gstpar(idtmed[3003], "LOSS", 1.);  //  [3003] = normal aluminum
 834     gMC->Gstpar(idtmed[3003], "HADR", 1.);
 835     gMC->Gstpar(idtmed[3003], "DCAY", 1.);
 836     gMC->Gstpar(idtmed[3003], "DRAY", 1.);
 837
 838     gMC->Gstpar(idtmed[3004], "LOSS", 1.);  //  [3004] = reflecting aluminum
 839     gMC->Gstpar(idtmed[3004], "HADR", 1.);
 840     gMC->Gstpar(idtmed[3004], "DCAY", 1.);
 841     gMC->Gstpar(idtmed[3004], "DRAY", 1.);
 842     gMC->Gstpar(idtmed[3004], "CUTGAM",0.5E-4) ;
 843     gMC->Gstpar(idtmed[3004], "CUTELE",1.0E-4) ;
 844
 845     gMC->Gstpar(idtmed[3005], "LOSS", 1.);  //  [3005] = scintillator
 846     gMC->Gstpar(idtmed[3005], "HADR", 1.);
 847     gMC->Gstpar(idtmed[3005], "DCAY", 1.);
 848     gMC->Gstpar(idtmed[3005], "DRAY", 1.);
 849     gMC->Gstpar(idtmed[3005], "CUTGAM",0.5E-4) ;
 850     gMC->Gstpar(idtmed[3005], "CUTELE",1.0E-4) ;
 851
 852
 853 //    geant3->Gsckov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 854 //    geant3->Gsckov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 855
 856 //    gMC->SetCerenkov(idtmed[3002], 14, ppckov, absco_quarz, effic_all,rindex_quarz);
 857 //    gMC->SetCerenkov(idtmed[3004], 14, ppckov_alu, absco_alu, effic_alu, rindex_alu);
 858
 859 }
 860
 861 //_____________________________________________________________________________
 862 void AliVZEROv5::DrawModule() const
 863 {
 864
 865 //  Drawing is done in DrawVZERO.C
 866
 867    AliDebug(2,"DrawModule");
 868 }
 869
 870 //_____________________________________________________________________________
 871 void AliVZEROv5::Init()
 872 {
 873 // Initialises version 2 of the VZERO Detector
 874 // Just prints an information message
 875
 876    AliInfo(Form("VZERO version %d initialized \n",IsVersion()));
 877
 878 //   gMC->SetMaxStep(fMaxStepAlu);
 879 //   gMC->SetMaxStep(fMaxStepQua);
 880
 881     AliVZERO::Init();
 882 }
 883
 884 //_____________________________________________________________________________
 885 void AliVZEROv5::StepManager()
 886 {
 887
 888 // Step Manager, called at each step
 889
 890      Int_t     copy;
 891      static    Int_t   vol[4];
 892      static    Float_t hits[21];
 893      static    Float_t eloss, tlength;
 894      static    Int_t   nPhotonsInStep;
 895      static    Int_t   nPhotons;
 896      static    Int_t   numStep;
 897      Float_t   ringNumber;
 898      Float_t   destep, step;
 899
 900      numStep += 1;
 901
 902 //   We keep only charged tracks :
 903
 904      if ( !gMC->TrackCharge() || !gMC->IsTrackAlive() ) return;
 905
 906      vol[0]    = gMC->CurrentVolOffID(1, vol[1]);
 907      vol[2]    = gMC->CurrentVolID(copy);
 908      vol[3]    = copy;
 909
 910      static Int_t idV0R1 = gMC->VolId("V0R1");
 911      static Int_t idV0L1 = gMC->VolId("V0L1");
 912      static Int_t idV0R2 = gMC->VolId("V0R2");
 913      static Int_t idV0L2 = gMC->VolId("V0L2");
 914      static Int_t idV0R3 = gMC->VolId("V0R3");
 915      static Int_t idV0L3 = gMC->VolId("V0L3");
 916      static Int_t idV0R4 = gMC->VolId("V0R4");
 917      static Int_t idV0L4 = gMC->VolId("V0L4");
 918      static Int_t idV0R5 = gMC->VolId("V0R5");
 919      static Int_t idV0R6 = gMC->VolId("V0R6");
 920
 921      if      ( gMC->CurrentVolID(copy) == idV0R1 ||
 922                gMC->CurrentVolID(copy) == idV0L1 )
 923                ringNumber = 1.0;
 924      else if ( gMC->CurrentVolID(copy) == idV0R2 ||
 925                gMC->CurrentVolID(copy) == idV0L2 )
 926                ringNumber = 2.0;
 927      else if ( gMC->CurrentVolID(copy) == idV0R3 ||
 928                gMC->CurrentVolID(copy) == idV0R4 ||
 929                gMC->CurrentVolID(copy) == idV0L3 )
 930                ringNumber = 3.0;
 931      else if ( gMC->CurrentVolID(copy) == idV0R5 ||
 932                gMC->CurrentVolID(copy) == idV0R6 ||
 933                gMC->CurrentVolID(copy) == idV0L4 )
 934                ringNumber = 4.0;
 935      else
 936                ringNumber = 0.0;
 937
 938      if  (  ringNumber > 0.5  ) {
 939
 940         destep    = gMC->Edep();
 941         step      = gMC->TrackStep();
 942
 943         nPhotonsInStep  = Int_t(destep / (fLightYield *1e-9) );
 944         nPhotonsInStep  = gRandom->Poisson(nPhotonsInStep);
 945
 946         eloss    += destep;
 947         tlength  += step;
 948
 949         if  ( gMC->IsTrackEntering()  )  {
 950
 951             nPhotons  =  nPhotonsInStep;
 952             gMC->TrackPosition(fTrackPosition);
 953             gMC->TrackMomentum(fTrackMomentum);
 954
 955             Float_t pt  = TMath::Sqrt( fTrackMomentum.Px() * fTrackMomentum.Px() +
 956                                        fTrackMomentum.Py() * fTrackMomentum.Py() );
 957
 958             hits[0]  = fTrackPosition.X();
 959             hits[1]  = fTrackPosition.Y();
 960             hits[2]  = fTrackPosition.Z();
 961             hits[3]  = Float_t (gMC->TrackPid());
 962
 963             hits[4]  = gMC->TrackTime();
 964             hits[5]  = gMC->TrackCharge();
 965             hits[6]  = fTrackMomentum.Theta()*TMath::RadToDeg();
 966             hits[7]  = fTrackMomentum.Phi()*TMath::RadToDeg();
 967             hits[8]  = ringNumber;
 968
 969             hits[9]  = pt;
 970             hits[10] = fTrackMomentum.P();
 971             hits[11] = fTrackMomentum.Px();
 972             hits[12] = fTrackMomentum.Py();
 973             hits[13] = fTrackMomentum.Pz();
 974
 975             TParticle *par = gAlice->GetMCApp()->Particle(gAlice->GetMCApp()->GetCurrentTrackNumber());
 976             hits[14] = par->Vx();
 977             hits[15] = par->Vy();
 978             hits[16] = par->Vz();
 979
 980             tlength  = 0.0;
 981             eloss    = 0.0;
 982          }
 983
 984          nPhotons  = nPhotons + nPhotonsInStep;
 985
 986          if( gMC->IsTrackExiting() || gMC->IsTrackStop() || gMC->IsTrackDisappeared()){
 987
 988          nPhotons  = nPhotons - Int_t((Float_t(nPhotons) * fLightAttenuation * fnMeters));
 989          nPhotons  = nPhotons - Int_t( Float_t(nPhotons) * fFibToPhot);
 990
 991          hits[17] =   eloss;
 992          hits[18] = tlength;
 993          hits[19] = nPhotons;
 994          hits[20] = GetCellId (vol, hits);
 995
 996          AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol, hits);
 997
 998          tlength         = 0.0;
 999          eloss           = 0.0;
1000          nPhotons        =   0;
1001          nPhotonsInStep  =   0;
1002
1003          numStep         =   0;
1004          }
1005     }
1006
1007 }
1008
1009 //_____________________________________________________________________________
1010 void AliVZEROv5::AddHit(Int_t track, Int_t *vol, Float_t *hits)
1011 {
1012
1013 //  Adds a VZERO hit
1014
1015   TClonesArray &lhits = *fHits;
1016   new(lhits[fNhits++]) AliVZEROhit(fIshunt,track,vol,hits);
1017 }
1018
1019 //_____________________________________________________________________________
1020 void AliVZEROv5::AddDigits(Int_t *tracks, Int_t* digits)
1021 {
1022
1023 //  Adds a VZERO digit
1024
1025    TClonesArray  &ldigits = *fDigits;
1026    new(ldigits[fNdigits++]) AliVZEROdigit(tracks, digits);
1027 }
1028
1029 //_____________________________________________________________________________
1030 void AliVZEROv5::MakeBranch(Option_t *option)
1031 {
1032
1033 // Creates new branches in the current Root Tree
1034
1035   char branchname[10];
1036   sprintf(branchname,"%s",GetName());
1037   AliDebug(2,Form("fBufferSize = %d",fBufferSize));
1038
1039   const char *cH = strstr(option,"H");
1040
1041   if (fHits   && TreeH() && cH) {
1042     TreeH()->Branch(branchname,&fHits, fBufferSize);
1043     AliDebug(2,Form("Making Branch %s for hits",branchname));
1044   }
1045
1046   const char *cD = strstr(option,"D");
1047
1048   if (fDigits   && fLoader->TreeD() && cD) {
1049     fLoader->TreeD()->Branch(branchname,&fDigits, fBufferSize);
1050     AliDebug(2,Form("Making Branch %s for digits",branchname));
1051   }
1052
1053 }
1054
1055 //_____________________________________________________________________________
1056 Int_t AliVZEROv5::GetCellId(Int_t *vol, Float_t *hits)
1057 {
1058
1059   //   Returns Id of scintillator cell
1060   //   Right side from  0 to 47
1061   //   Left  side from 48 to 95
1062
1063   //   hits[8] = ring number (1 to 4)
1064   //   vol[1]  = copy number (1 to 8)
1065
1066    Int_t index      = vol[1];
1067    Int_t RingNumber = Int_t(hits[8]);
1068    fCellId          = 0;
1069
1070 //    cout << "volID = " << vol[0] << "  copy = " << vol[1] << endl;
1071 //    cout << "X     = " << hits[0] << "    Y = " << hits[1] << endl;
1072
1073    Float_t phi = Float_t(TMath::ATan2(Double_t(hits[1]),Double_t(hits[0])) );
1074    Float_t kRaddeg = 180.0/TMath::Pi();
1075    phi = kRaddeg * phi;
1076
1077    if (index < 7) index = index + 8;
1078
1079    if (hits[2] < 0.0) {
1080       if(RingNumber < 3) {
1081          index = (index - 7) + ( ( RingNumber - 1 ) * 8);}
1082       else if(RingNumber >= 3){
1083        if(gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R3")||
1084           gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R5") )
1085          {index = (index*2 - 14) + ( ( RingNumber - 2 ) * 16); }
1086        if(gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R4")||
1087           gMC->CurrentVolID(vol[1]) == gMC->VolId("V0R6") )
1088          {index = (index*2 - 13) + ( ( RingNumber - 2 ) * 16); }
1089       }
1090       fCellId   = index;
1091    }
1092
1093    else if (hits[2] > 0.0){
1094       index = (index - 7 + 48) + ( ( RingNumber - 1 ) * 8);
1095       fCellId   = index;}
1096
1097 //    cout << " ring   = " << RingNumber << " phi = "<<  phi << endl;
1098 //    cout << " cellID = " << fCellId <<  endl;
1099 //    cout <<  "**********" << endl;
1100
1101    return fCellId;
1102
1103
1104 }