TPC/AliTPCv2.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   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  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.                  *
  14  **************************************************************************/
  15
  16 /*
  17 $Log$
  18 Revision 1.47  2003/03/04 15:16:54  kowal2
  19 Geometry corrected for an overlap
  20
  21 Revision 1.46  2003/02/11 16:54:07  hristov
  22 Updated AliTrackReference class (S.Radomski)
  23
  24 Revision 1.45  2003/01/14 10:50:20  alibrary
  25 Cleanup of STEER coding conventions
  26
  27 Revision 1.44  2002/11/21 22:43:32  alibrary
  28 Removing AliMC and AliMCProcess
  29
  30 Revision 1.43  2002/10/14 14:57:43  hristov
  31 Merging the VirtualMC branch to the main development branch (HEAD)
  32
  33 Revision 1.40.6.2  2002/07/24 10:09:01  alibrary
  34 Updating VirtualMC
  35
  36 Revision 1.42  2002/06/12 14:56:56  kowal2
  37 Added track length to the reference hits
  38
  39 Revision 1.41  2002/05/27 14:33:15  hristov
  40 The new class AliTrackReference used (M.Ivanov)
  41
  42 Revision 1.40  2002/01/21 17:12:00  kowal2
  43 New track hits structure using root containers
  44
  45 Revision 1.39  2001/05/16 14:57:25  alibrary
  46 New files for folders and Stack
  47
  48 Revision 1.38  2001/05/08 16:03:06  kowal2
  49 Geometry update according to the latest technical spec.
  50
  51 Revision 1.37  2001/04/27 15:23:07  kowal2
  52 Correct materian in the central part of the inner containment vessel
  53
  54 Revision 1.36  2001/04/26 06:15:12  kowal2
  55 Corrected bug in the inner containment vessel (cones)
  56
  57 Revision 1.35  2001/04/24 11:17:33  kowal2
  58 New TPC geometry.
  59
  60 Revision 1.34  2001/04/23 10:20:18  hristov
  61 Constant casted to avoid ambiguity
  62
  63 Revision 1.33  2001/04/20 08:16:47  kowal2
  64 Protection against too small betaGamma. Thanks to Ivana and Yves.
  65
  66 Revision 1.32  2001/03/13 13:07:34  kowal2
  67 Corrected bug in the TPC mother volume geometry.
  68 Thanks to A. Morsch
  69
  70 Revision 1.31  2000/11/30 11:48:50  kowal2
  71 TLorentzVector.h adde to satisfy the latest changes by Federico
  72
  73 Revision 1.30  2000/11/14 10:48:57  kowal2
  74 Correct material used for TSA4. Thanks to J. Barbosa.
  75
  76 Revision 1.29  2000/11/06 17:24:10  kowal2
  77 Corrected bug in the outer containment vessel and
  78 the outer field cage geometry.
  79 Thanks to J. Barbosa.
  80
  81 Revision 1.28  2000/11/02 16:55:24  kowal2
  82 Corrected bug in the inner containment vessel geometry.
  83 Thanks to J. Belikov
  84
  85 Revision 1.27  2000/11/02 07:24:11  kowal2
  86 Correction in the TPC geometry.
  87 Changes due to the new hit structure.
  88
  89 Revision 1.26  2000/10/05 16:16:29  kowal2
  90 Corrections of the hit recording algorithm.
  91
  92 Revision 1.25  2000/10/02 21:28:18  fca
  93 Removal of useless dependecies via forward declarations
  94
  95 Revision 1.24  2000/08/28 10:02:30  kowal2
  96 Corrected bug in the StepManager
  97
  98 Revision 1.23  2000/07/10 20:57:39  hristov
  99 Update of TPC code and macros by M.Kowalski
 100
 101 Revision 1.22  2000/06/30 12:07:50  kowal2
 102 Updated from the TPC-PreRelease branch
 103
 104 Revision 1.21.2.4  2000/06/26 07:39:42  kowal2
 105 Changes to obey the coding rules
 106
 107 Revision 1.21.2.3  2000/06/25 08:38:41  kowal2
 108 Splitted from AliTPCtracking
 109
 110 Revision 1.21.2.2  2000/06/16 12:58:13  kowal2
 111 Changed parameter settings
 112
 113 Revision 1.21.2.1  2000/06/09 07:15:07  kowal2
 114
 115 Defaults loaded automatically (hard-wired)
 116 Optional parameters can be set via macro called in the constructor
 117
 118 Revision 1.21  2000/05/15 10:00:30  kowal2
 119 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
 120
 121 Revision 1.20  2000/04/17 09:37:33  kowal2
 122 removed obsolete AliTPCDigitsDisplay.C
 123
 124 Revision 1.19.8.2  2000/04/10 08:31:52  kowal2
 125
 126 Different geometry for different sectors
 127 Updated readout chambers
 128 Some modifications to StepManager by J.Belikov
 129
 130 Revision 1.19.8.1  2000/04/10 07:56:53  kowal2
 131 Not used anymore - removed
 132
 133 Revision 1.19  1999/11/04 17:28:07  fca
 134 Correct barrel part of HV Degrader
 135
 136 Revision 1.18  1999/10/14 16:52:08  fca
 137 Only use PDG codes and not GEANT ones
 138
 139 Revision 1.17  1999/10/08 06:27:23  fca
 140 Corrected bug in the HV degrader geometry, thanks to G.Tabary
 141
 142 Revision 1.16  1999/10/04 13:39:54  fca
 143 Correct array index problem
 144
 145 Revision 1.15  1999/09/29 09:24:34  fca
 146 Introduction of the Copyright and cvs Log
 147
 148 */
 149
 150 //
 151 ///////////////////////////////////////////////////////////////////////////////
 152 //                                                                           //
 153 //  Time Projection Chamber version 2 -- detailed TPC and slow simulation    //
 154 //                                                                           //
 155 //Begin_Html
 156 /*
 157 <img src="picts/AliTPCv2Class.gif">
 158 */
 159 //End_Html
 160 //                                                                           //
 161 //                                                                           //
 162 ///////////////////////////////////////////////////////////////////////////////
 163
 164 #include <stdlib.h>
 165
 166 #include <TMath.h>
 167 #include <TPDGCode.h>
 168
 169 #include "AliConst.h"
 170 #include "AliRun.h"
 171 #include "AliTPCDigitsArray.h"
 172 #include "AliTPCParam.h"
 173 #include "AliTPCParamSR.h"
 174 #include "AliTPCTrackHitsV2.h"
 175 #include "AliTPCv2.h"
 176 #include "TLorentzVector.h"
 177
 178 ClassImp(AliTPCv2)
 179
 180 //_____________________________________________________________________________
 181 AliTPCv2::AliTPCv2(const char *name, const char *title) :
 182   AliTPC(name, title)
 183 {
 184   //
 185   // Standard constructor for Time Projection Chamber version 2
 186   //
 187   fIdSens=0;
 188   fIdLSec=0;
 189   fIdUSec=0;
 190
 191   SetBufferSize(128000);
 192
 193   SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
 194
 195   // Default sectors
 196
 197   SetSecAL(4);
 198   SetSecAU(4);
 199   SetSecLows(1,  2,  3, 19, 20, 21);
 200   SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
 201   SetSens(1); // sensitive strips set
 202
 203   if (fTPCParam)
 204      fTPCParam->Write(fTPCParam->GetTitle());
 205 }
 206
 207 //_____________________________________________________________________________
 208 void AliTPCv2::CreateGeometry()
 209 {
 210   //
 211   // Create the geometry of Time Projection Chamber version 2
 212   //
 213   //Begin_Html
 214   /*
 215     <img src="picts/AliTPC.gif">
 216   */
 217   //End_Html
 218   //Begin_Html
 219   /*
 220     <img src="picts/AliTPCv2Tree.gif">
 221   */
 222   //End_Html
 223
 224
 225   Int_t *idtmed = fIdtmed->GetArray();
 226
 227   Float_t dm[50];
 228   Int_t idrotm[120];
 229
 230   Int_t nRotMat = 0;
 231
 232   Int_t i,ifl1=0;
 233
 234   // number of sectors
 235
 236   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 237   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 238
 239   // ---------------------------------------------------
 240   //        sector specification check
 241   // ---------------------------------------------------
 242   if (fSecAL >= 0) {
 243     ifl1 = 0;
 244
 245     for (i = 0; i < 6; ++i) {
 246       if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
 247         ifl1 = 1;
 248         printf("%s: *** SECTOR %d selected\n",ClassName(),fSecLows[i]);
 249       }
 250     }
 251
 252   } else {
 253     printf("%s: *** ALL LOWER SECTORS SELECTED ***\n",ClassName());
 254     ifl1 = 1;
 255   }
 256
 257   if (ifl1 == 0) {
 258     printf("%s: *** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n",ClassName());
 259     printf("%s: !!! PROGRAM STOPPED !!!\n",ClassName());
 260     exit(1);
 261   }
 262
 263   if (fSecAU >= 0) {
 264
 265     for (i = 0; i < 12; ++i) {
 266       if (fSecUps[i] > 2*nInnerSector-1 &&
 267           fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
 268         printf("%s: *** SECTOR %d selected\n",ClassName(),fSecUps[i]);
 269       }
 270     }
 271
 272   } else {
 273     printf("%s: *** ALL UPPER SECTORS SELECTED ***\n",ClassName());
 274   }
 275
 276
 277
 278   //--------------------------------------------------------------------
 279
 280   //
 281   //  Mother volume TPC (Air) - all volumes will be positioned in it
 282   //
 283
 284   dm[0]=0.;
 285   dm[1]=360.;
 286   dm[2]=8.;
 287
 288   //
 289
 290   dm[3]=-283.7;
 291   dm[4]=65.6;
 292   dm[5]=278.;
 293
 294   //
 295
 296   dm[6]=-253.6;
 297   dm[7]=65.6;
 298   dm[8]=278.;
 299
 300   //
 301
 302   dm[9]=-73.3;
 303   dm[10]=60.9;
 304   dm[11]=278.;
 305
 306   //
 307
 308   dm[12]=-73.3;
 309   dm[13]=56.9;
 310   dm[14]=278.;
 311
 312   //
 313
 314   dm[15]=73.3;
 315   dm[16]=56.9;
 316   dm[17]=278.;
 317
 318   //
 319
 320   dm[18]=73.3;
 321   dm[19]=60.9;
 322   dm[20]=278.;
 323
 324   //
 325
 326   dm[21]=253.6;
 327   dm[22]=65.6;
 328   dm[23]=278.;
 329
 330   //
 331
 332   dm[24]=283.7;
 333   dm[25]=65.6;
 334   dm[26]=278.;
 335
 336   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
 337
 338   // outer part
 339
 340   //-------------------------------------------------------------------
 341   //   Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
 342   //-------------------------------------------------------------------
 343
 344   dm[0]= 0.;
 345   dm[1]= 360.;
 346   dm[2]= 6.;
 347
 348   //
 349
 350   dm[3]=-253.6;
 351   dm[4]=258.;
 352   dm[5]=275.5;
 353
 354   //
 355
 356   dm[6]=-250.6;
 357   dm[7]=258.;
 358   dm[8]=275.5;
 359
 360   //
 361
 362   dm[9]=-250.6;
 363   dm[10]=258.;
 364   dm[11]=278.;
 365
 366   //
 367
 368   dm[12]=253.6;
 369   dm[13]=258.;
 370   dm[14]=278.;
 371
 372   //
 373
 374   dm[15]=253.6;
 375   dm[16]=264.8;
 376   dm[17]=278.;
 377
 378   //
 379
 380   dm[18]=256.6;
 381   dm[19]=264.8;
 382   dm[20]=278.;
 383
 384   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 385
 386   //----------------------------------------------------------------
 387   // Tpc Outer Contaiment Vessel
 388   //  mother volume - Al, daughters - composite (sandwich)
 389   //----------------------------------------------------------------
 390
 391   dm[0]=0.;
 392   dm[1]=360.;
 393   dm[2]=6.;
 394
 395   //
 396
 397   dm[3]=-250.6;
 398   dm[4]=270.4;
 399   dm[5]=278.;
 400
 401   //
 402
 403   dm[6]=-247.6;
 404   dm[7]=270.4;
 405   dm[8]=278.;
 406
 407   //
 408
 409   dm[9]=-247.6;
 410   dm[10]=274.8124;
 411   dm[11]=278.;
 412
 413   //
 414
 415   dm[12]=253.6;
 416   dm[13]=274.8124;
 417   dm[14]=278.;
 418
 419   //
 420
 421   dm[15]=253.6;
 422   dm[16]=264.8;
 423   dm[17]=278.;
 424
 425   //
 426
 427   dm[18]=256.6;
 428   dm[19]=264.8;
 429   dm[20]=278.;
 430
 431   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 432
 433   // Daughter volumes - sandwich
 434
 435   // Tpc SAndwich 1 - Al
 436
 437   dm[0]=274.8124;
 438   dm[1]=278.;
 439   dm[2]=252.1;
 440
 441   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 442
 443   // Tpc SAndwich 2 - epoxy glue (I use Lexan)
 444
 445   dm[0] += 5.e-3;
 446   dm[1] -= 5.e-3;
 447
 448   gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
 449
 450   // Tpc SAndwich 3 - Tedlar
 451
 452   dm[0] += 0.01;
 453   dm[1] -= 0.01;
 454
 455   gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
 456
 457
 458   // Tpc SAndwich 4 - fiber glass (G10)
 459
 460   dm[0] += 3.8e-3;
 461   dm[1] -= 3.8e-3;
 462
 463   gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
 464
 465   // Tpc SAndwich 5 - NOMEX honeycomb
 466
 467   dm[0] += 0.075;
 468   dm[1] -= 0.075;
 469
 470   gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
 471
 472   // 5->4->3->2->1->TCOV
 473
 474
 475   gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
 476   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 477   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 478   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 479
 480   gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
 481
 482   // TCOV-> TOIN
 483
 484   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 485
 486   //-------------------------------------------------------
 487   //  Tpc Outer Field Cage
 488   //  mother volume - Al, daughters - composite (sandwich)
 489   //-------------------------------------------------------
 490
 491   dm[0]=0.;
 492   dm[1]=360.;
 493   dm[2]=6.;
 494
 495   //
 496
 497   dm[3]=-253.6;
 498   dm[4]=258.;
 499   dm[5]=275.5;
 500
 501   //
 502
 503   dm[6]=-250.6;
 504   dm[7]=258.;
 505   dm[8]=275.5;
 506
 507   //
 508
 509   dm[9]=-250.6;
 510   dm[10]=258.;
 511   dm[11]=260.0476;
 512
 513   //
 514
 515   dm[12]=250.6;
 516   dm[13]=258.;
 517   dm[14]=260.0476;
 518
 519   //
 520
 521   dm[15]=250.6;
 522   dm[16]=258.;
 523   dm[17]=269.6;
 524
 525   //
 526
 527   dm[18]=253.6;
 528   dm[19]=258.;
 529   dm[20]=269.6;
 530
 531   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 532
 533   // Daughter volumes
 534
 535   // Tpc SAndwich 6 - Tedlar
 536
 537   dm[0]= 258.;
 538   dm[1]= 260.0476;
 539   dm[2]= 252.1;
 540
 541   gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
 542
 543   // Tpc SAndwich 7 - fiber glass
 544
 545   dm[0] += 3.8e-3;
 546   dm[1] -= 3.8e-3;
 547
 548   gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
 549
 550
 551   // Tpc SAndwich 8 - NOMEX
 552
 553   dm[0] += 0.02;
 554   dm[1] -= 0.02;
 555
 556   gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
 557
 558   // 8->7->6->TOFC
 559
 560   gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
 561   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 562   gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
 563
 564   // TOFC->TOIN
 565   // TOFC overlaps with
 566
 567   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 568
 569   // TOIN->TPC
 570
 571   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 572
 573   // inner part
 574
 575   //--------------------------------------------------------------------
 576   // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
 577   // Inner containment vessel will be placed directly in the TPC
 578   //--------------------------------------------------------------------
 579
 580   dm[0]=0.;
 581   dm[1]=360.;
 582   dm[2]=4.;
 583
 584   //
 585
 586   dm[3]=-253.6;
 587   dm[4]=65.9;
 588   dm[5]=79.2;
 589
 590   //
 591
 592   dm[6]=-73.3;
 593   dm[7]=61.2;
 594   dm[8]=79.2;
 595
 596   //
 597
 598   dm[9]=73.3;
 599   dm[10]=61.2;
 600   dm[11]=79.2;
 601
 602   //
 603
 604   dm[12]=253.6;
 605   dm[13]=65.9;
 606   dm[14]=79.2;
 607
 608   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
 609
 610   // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
 611
 612   dm[0]=79.16;
 613   dm[1]=79.2;
 614   dm[2]=88.;
 615
 616   gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
 617
 618   gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
 619
 620   //-----------------------------------------------------
 621   // Tpc Inner Field Cage
 622   // mother volume - Al, daughters - composite (sandwich)
 623   //------------------------------------------------------
 624
 625   dm[0]=0.;
 626   dm[1]=360.;
 627   dm[2]=10.;
 628
 629   //
 630
 631   dm[3]=-253.6;
 632   dm[4]=70.3;
 633   dm[5]=79.2;
 634
 635   //
 636
 637   dm[6]=-250.6;
 638   dm[7]=70.3;
 639   dm[8]=79.2;
 640
 641   //
 642
 643   dm[9]=-250.6;
 644   dm[10]=77.0524;
 645   dm[11]=79.2;
 646
 647   //
 648
 649   dm[12]=-88.;
 650   dm[13]=77.0524;
 651   dm[14]=79.2;
 652
 653   //
 654
 655   dm[15]=-88.;
 656   dm[16]=77.0924;
 657   dm[17]=79.16;
 658
 659   //
 660
 661   dm[18]=88.;
 662   dm[19]=77.0924;
 663   dm[20]=79.16;
 664
 665   //
 666
 667   dm[21]=88.;
 668   dm[22]=77.0524;
 669   dm[23]=79.2;
 670
 671   //
 672
 673   dm[24]=250.6;
 674   dm[25]=77.0524;
 675   dm[26]=79.2;
 676
 677   //
 678
 679   dm[27]=250.6;
 680   dm[28]=70.3;
 681   dm[29]=79.2;
 682
 683   //
 684
 685   dm[30]=253.6;
 686   dm[31]=70.3;
 687   dm[32]=79.2;
 688
 689   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
 690
 691   // daughter volumes - central part
 692
 693   // Tpc Sandwich 9 -Tedlar
 694
 695   dm[0]=77.0924;
 696   dm[1]=79.16;
 697   dm[2]=88.;
 698
 699   gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
 700
 701   // Tpc Sandwich 10 - fiber glass (G10)
 702
 703   dm[0] += 3.8e-3;
 704   dm[1] -= 3.8e-3;
 705
 706   gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
 707
 708   // Tpc Sandwich 11 - NOMEX
 709
 710   dm[0] += 0.03;
 711   dm[1] -= 0.03;
 712
 713   gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
 714
 715   // 11->10->9->TIFC
 716
 717   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 718   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 719
 720   gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
 721
 722   // daughter volumes - outer parts (reinforced)
 723
 724   // Tpc Sandwich 12 -Tedlar
 725
 726   dm[0]=77.0524;
 727   dm[1]=79.2;
 728   dm[2]=82.05;
 729
 730   gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
 731
 732   // Tpc Sandwich 13 - fiber glass (G10)
 733
 734   dm[0] += 3.8e-3;
 735   dm[1] -= 3.8e-3;
 736
 737   gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
 738
 739   // Tpc Sandwich 14 - NOMEX
 740
 741   dm[0] += 0.07;
 742   dm[1] -= 0.07;
 743
 744   gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
 745
 746   // 14->13->12->TIFC
 747
 748   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 749   gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
 750
 751   gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
 752   gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
 753
 754   // place this inside the inner insulator
 755
 756   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
 757
 758   // and now in the TPC...
 759
 760   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 761
 762   //---------------------------------------------------------
 763   // Tpc Inner Containment vessel - Cones
 764   //---------------------------------------------------------
 765
 766   dm[0]=0.;
 767   dm[1]=360.;
 768   dm[2]=8.;
 769
 770   //
 771
 772   dm[3]=71.8;
 773   dm[4]=56.9;
 774   dm[5]=59.4;
 775
 776   //
 777
 778   dm[6]=73.;
 779   dm[7]=56.9;
 780   dm[8]=59.4;
 781
 782   //
 783
 784   dm[9]=73.;
 785   dm[10]=56.9;
 786   dm[11]=61.2;
 787
 788   //
 789
 790   dm[12]=73.3;
 791   dm[13]=56.9;
 792   dm[14]=61.2;
 793
 794   //
 795
 796   dm[15]=73.3;
 797   dm[16]=60.9;
 798   dm[17]=61.2;
 799
 800   //
 801
 802   dm[18]=253.6;
 803   dm[19]=65.6;
 804   dm[20]=65.9;
 805
 806   //
 807
 808   dm[21]=253.6;
 809   dm[22]=65.6;
 810   dm[23]=74.6;
 811
 812   //
 813
 814   dm[24]=256.6;
 815   dm[25]=65.6;
 816   dm[26]=74.6;
 817
 818   gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
 819
 820   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
 821
 822   // reflection matrix
 823
 824   theta1 = 90.;
 825   phi1   = 0.;
 826   theta2 = 90.;
 827   phi2   = 270.;
 828   theta3 = 180.;
 829   phi3   = 0.;
 830
 831   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 832
 833   gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
 834   gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 835
 836
 837   //---------------------------------------------------------
 838   // Tpc Inner Containment vessel - Middle part -Al
 839   //---------------------------------------------------------
 840
 841   dm[0]=0.;
 842   dm[1]=360.;
 843   dm[2]=6.;
 844
 845   //
 846
 847   dm[3]=-71.6;
 848   dm[4]=60.2;
 849   dm[5]=61.2;
 850
 851   //
 852
 853   dm[6]=-69.1;
 854   dm[7]=60.2;
 855   dm[8]=61.2;
 856
 857   //
 858
 859   dm[9]=-69.1;
 860   dm[10]=60.6224;
 861   dm[11]=61.2;
 862
 863   //
 864
 865   dm[12]=69.1;
 866   dm[13]=60.6224;
 867   dm[14]=61.2;
 868
 869   //
 870
 871   dm[15]=69.1;
 872   dm[16]=60.2;
 873   dm[17]=61.2;
 874
 875   //
 876
 877   dm[18]=71.6;
 878   dm[19]=60.2;
 879   dm[20]=61.2;
 880
 881   gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
 882
 883   // Tpc Sandwich 15 - Al
 884
 885   dm[0]=60.6224;
 886   dm[1]=61.2;
 887   dm[2]=70.1;
 888
 889   gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
 890
 891   // Tpc Sandwich 16 -  epoxy glue
 892
 893   dm[0] += 5.e-3;
 894   dm[1] -= 5.e-3;
 895
 896   gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
 897
 898   // Tpc Sandwich 17 - Tedlar
 899
 900   dm[0] += 0.01;
 901   dm[1] -= 0.01;
 902
 903   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 904
 905   // Tpc Sandwich 18 - carbon fiber
 906
 907   dm[0] += 3.8e-3;
 908   dm[1] -= 3.8e-3;
 909
 910   gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
 911
 912   // Tpc Sandwich 19 - Nomex
 913
 914   dm[0] += 0.02;
 915   dm[1] -= 0.02;
 916
 917   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
 918
 919   // 19->18->17->16->15-> TICM
 920
 921   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
 922   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
 923   gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
 924   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 925
 926   gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
 927
 928
 929   // TPc inner cont. vessel Joints
 930
 931   dm[0]=60.2;
 932   dm[1]=61.2;
 933   dm[2]=0.5;
 934
 935   gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
 936
 937   gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
 938   gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
 939
 940   //
 941
 942   dm[0]=0.;
 943   dm[1]=360.;
 944   dm[2]=4.;
 945
 946   //
 947
 948   dm[3]=70.8;
 949   dm[4]=58.4;
 950   dm[5]=60.1;
 951
 952   //
 953
 954   dm[6]=71.2;
 955   dm[7]=58.4;
 956   dm[8]=60.1;
 957
 958   //
 959
 960   dm[9]=71.2;
 961   dm[10]=58.4;
 962   dm[11]=59.4;
 963
 964   //
 965
 966   dm[12]=71.6;
 967   dm[13]=58.4;
 968   dm[14]=59.4;
 969
 970   gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
 971
 972   gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
 973   gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 974
 975
 976
 977   // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
 978
 979   dm[0]=58.4;
 980   dm[1]=61.2;
 981   dm[2]=0.1;
 982
 983   gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
 984
 985   gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
 986   gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
 987
 988   // TICM -> TPC
 989
 990   gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
 991
 992   //
 993
 994   nRotMat++; // prepare for the next rotation matrix
 995
 996   //---------------------------------------------------------
 997   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
 998   //  and its daughters (HV membrane, rods, readout chambers)
 999   //---------------------------------------------------------
1000
1001   dm[0]= 79.2;
1002   dm[1]= 258.0;
1003   dm[2]= 253.6;
1004
1005   gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);
1006
1007   // sector opening angles
1008
1009   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1010   Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1011
1012   // sector angle shift
1013
1014   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1015
1016
1017   // All above parameters are identical for inner and outer
1018   // sectors. The distinction is kept for the historical reasons
1019   // and eventually will disappear.
1020
1021   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1022   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1023   Float_t space;
1024
1025   //-------------------------------------------------------------------------
1026   //   Tpc Inner Readout Chambers
1027   //-------------------------------------------------------------------------
1028
1029   dm[0]= 14.483;
1030   dm[1]= 23.3345;
1031   dm[2]= 1.6; // thickness
1032   dm[3]= 25.1;
1033
1034   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1035
1036   // this volume will be positioned in the empty space
1037   // of the end-cap to avoid overlaps
1038
1039   dm[0]= 13.7305;
1040   dm[1]= 21.1895;
1041   dm[2]= 2.25;
1042   dm[3]= 21.15;
1043
1044   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1045
1046
1047   //------------------------------------------------
1048   // Tpc Inner readout chamber Pad Plane
1049   //------------------------------------------------
1050
1051   dm[0]= 14.483;
1052   dm[1]= 23.3345;
1053   dm[2]= 0.5;
1054   dm[3]= 25.1;
1055
1056   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1057
1058   //
1059
1060   dm[0] -= 1.218511934;
1061   dm[1] -= 1.218511934;
1062   dm[2] = 0.35;
1063
1064   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1065
1066   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1067
1068   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1069
1070
1071   //----------------------------------------------
1072   // Tpc Readout Chambers Empty spaces - for both
1073   // inner and outer sectors
1074   //----------------------------------------------
1075
1076   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1077
1078   // Inner sector - 4 spaces
1079
1080
1081   dm[3] = 4.7625;
1082   dm[0] = 12.472;
1083
1084   Float_t rr = 90.52;
1085   Float_t zz;
1086
1087   zz= -12.7875;
1088
1089   space = rr*tanAlpha-dm[0];
1090
1091   for(Int_t nsLow=0;nsLow<4;nsLow++){
1092
1093     rr += 9.525;
1094     dm[1]= rr*tanAlpha - space;
1095
1096     dm[2]=0.8;
1097
1098     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1099
1100     //
1101
1102     dm[2] = 1.2;
1103
1104     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1105
1106     rr += 0.4;
1107     dm[0] = rr*tanAlpha - space;
1108     zz += (0.4+9.525);
1109
1110   }
1111
1112   dm[0]= 12.472;
1113   // dm[1] - this is the dm[1] from the previous TRCE
1114   dm[2]= 1.05;
1115   dm[3]= 19.65;
1116
1117   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1118
1119   //
1120   // TPc Space for Connectors
1121   //
1122
1123   dm[0]= .3;
1124   dm[1]= .3;
1125   dm[2]= 4.5;
1126
1127   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1128
1129   // TPC Connectors
1130
1131   dm[0]= .25;
1132   dm[1]= .15;
1133   dm[2]= 3.75;
1134
1135   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1136
1137   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1138
1139   zz = -12.7875;
1140
1141
1142   Float_t alpha;
1143   Float_t astep;
1144
1145   // inner part of the inner sector - 2 x 20 holes
1146
1147   astep = 20.00096874/19.;
1148
1149   alpha = 10.00048437-astep;
1150
1151   Float_t x1,x2;
1152
1153     x1 = 13.31175725;
1154     x1 -= 0.996357832;
1155
1156     x2 = 15.06180253;
1157     x2 -= 1.163028812;
1158
1159   Int_t ncon;
1160
1161   for(ncon=0;ncon<20;ncon++){
1162
1163     phi1 = 0.;
1164     theta1 = 90.+alpha;
1165     phi2=90.;
1166     theta2 = 90.;
1167     phi3 = (alpha>0) ? 0. : 180.;
1168     theta3 = TMath::Abs(alpha);
1169
1170     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1171
1172
1173
1174     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1175     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1176
1177
1178     x1 -= 1.296357833;
1179     x2 -= 1.463028812;
1180
1181     alpha -= astep;
1182     nRotMat++;
1183
1184   }
1185
1186   // outer part of the inner sector - 2 x 25 holes
1187
1188    astep = 20.00096874/24.;
1189    alpha = 10.00048437-astep;
1190
1191    x1 = 16.81184781;
1192    x1 -= 1.016295986;
1193
1194    x2 = 18.5618931;
1195    x2 -= 1.150914854;
1196
1197   for(ncon=0;ncon<25;ncon++){
1198
1199     phi1 = 0.;
1200     theta1 = 90.+alpha;
1201     phi2=90.;
1202     theta2 = 90.;
1203     phi3 = (alpha>0) ? 0. : 180.;
1204     theta3 = TMath::Abs(alpha);
1205
1206     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1207
1208
1209
1210     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1211     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1212
1213
1214     x1 -= 1.316295986;
1215     x2 -= 1.450914854;
1216
1217     alpha -= astep;
1218     nRotMat++;
1219
1220   }
1221
1222   //--------------------------------------------------------------------------
1223   //  TPC Outer Readout Chambers
1224   //  this is NOT a final design
1225   //--------------------------------------------------------------------------
1226
1227   dm[0]= 23.3875;
1228   dm[1]= 43.524;
1229   dm[2]= 1.5; //thickness
1230   dm[3]= 57.1;
1231
1232   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1233
1234   //------------------------------------------------
1235   // Tpc Outer readout chamber Pad Plane
1236   //------------------------------------------------
1237
1238   dm[2]= 0.5;
1239
1240   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1241
1242   dm[0] -= 1.218511934;
1243   dm[1] -= 1.218511934;
1244   dm[2] = 0.35;
1245
1246   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1247
1248   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1249
1250   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1251
1252   // empty space
1253
1254   dm[0]= 21.035;
1255   dm[1]= 38.7205;
1256   dm[2]= 0.7;
1257   dm[3]= 50.15;
1258
1259   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1260
1261   dm[0]= 22.2935;
1262   dm[1]= 40.5085;
1263   dm[2]= 2.25;
1264   dm[3]= 51.65;
1265
1266   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1267
1268   dm[0]= 21.35;
1269   dm[1]= 38.7205;
1270   dm[2]= 2.25;
1271   dm[3]= 50.15;
1272
1273   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1274
1275   //-----------------------------------------------
1276   // Tpc Services Support Wheel
1277   //-----------------------------------------------
1278
1279   dm[0]=0.;
1280   dm[1]=360.;
1281   dm[2]=18.;
1282   dm[3]=2.;
1283
1284   dm[4]= -5.;
1285   dm[5]= 77.017;
1286   dm[6]= 255.267;
1287
1288   dm[7]= 5.;
1289   dm[8]= dm[5];
1290   dm[9]= dm[6];
1291
1292   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1293
1294   // Tpc Services Wheel Cover
1295
1296   dm[4]= -0.5;
1297   dm[7]= 0.5;
1298
1299   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1300
1301   // Tpc Service wheel Cover Empty space
1302
1303   dm[0]= 10.99;
1304   dm[1]= 39.599;
1305   dm[2]= .5;
1306   dm[3]= 81.125;
1307
1308   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1309
1310   // Tpc services Wheel Empty Spaces
1311
1312   dm[0]= 13.18017507;
1313   dm[1]= 44.61045938;
1314   dm[2]= 4.;
1315   dm[3]= 89.125;
1316
1317   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1318
1319   // Tpc Services Wheel Bars
1320
1321   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1322
1323   // bars-> TWES
1324
1325   dm[2]= 4.;
1326   dm[3]= .4;
1327
1328   dm[0]= 13.8149522;
1329   dm[1]= 13.95601379;
1330
1331   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1332
1333   dm[0]= 43.83462067;
1334   dm[1]= 43.97568225;
1335
1336   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1337
1338   // TPc ELectronics - right now 30% X0 Si
1339
1340   dm[0]= 14.03813696;
1341   dm[1]= 43.3524075;
1342   dm[2]= 1.404;
1343   dm[3]= 83.125;
1344
1345   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1346   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1347
1348   //--------------------------------------------------------------------------
1349   //  End caps
1350   //--------------------------------------------------------------------------
1351
1352   // TPc Main Wheel - Al
1353
1354   dm[0]= 74.9;
1355   dm[1]= 264.4;
1356   dm[2]= 3.0;
1357
1358   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1359
1360   //--------------------------------------------------------------------------
1361   //  Tpc Empty Space for the Readout chambers
1362   //--------------------------------------------------------------------------
1363
1364   Float_t rLow= 86.2;
1365   Float_t rUp= 243.5;
1366   Float_t dR = 0.5*(rUp-rLow);
1367
1368   space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1369
1370   dm[0]= rLow*tanAlpha-space;
1371   dm[1]= rUp*tanAlpha-space;
1372   dm[2] = 3.0;
1373   dm[3]= dR;
1374
1375   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1376
1377   // TIC1->TESR
1378
1379   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1380
1381   // TOC1->TESR
1382
1383   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1384
1385   // Tpc Empty Space Bars - Al (daughters of TESR)
1386
1387   Float_t zBar;
1388
1389   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1390
1391   // lower bar
1392
1393   dm[0]= rLow*tanAlpha-space;
1394   dm[1]= 88.7*tanAlpha-space;
1395   dm[2]= 2.25;
1396   dm[3]= 1.275;
1397
1398   zBar = -dR+dm[3];
1399
1400   gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1401
1402   // middle bar
1403
1404   dm[0]= 131.65*tanAlpha-space;
1405   dm[1]= 136.5*tanAlpha-space;
1406   dm[3]= 2.425;
1407
1408   zBar = -dR +131.65+dm[3]-rLow;
1409
1410   gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1411
1412   // upper bar
1413
1414   dm[0]= 240.4*tanAlpha-space;
1415   dm[1]= rUp*tanAlpha-space;
1416   dm[3]= 1.55;
1417
1418   zBar = dR-dm[3];
1419
1420   gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1421
1422   //------------------------------------------------------
1423   //  TPc Lower "S" Sectors
1424   //------------------------------------------------------
1425
1426
1427   Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1428   Float_t inSecUpEdge =  fTPCParam->GetInnerRadiusUp();
1429
1430   dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1431   dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1432   dm[2] = 0.5*(250. - 5.e-3);
1433   dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1434
1435   gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1436
1437
1438   //----------------------------------------------------------
1439   //  TPc Upper Sectors
1440   //----------------------------------------------------------
1441
1442   Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1443   Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1444
1445   dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1446   dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1447   dm[2] = 0.5*(250. - 5.e-3);
1448   dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1449
1450   gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1451
1452
1453
1454   // sensitive strips
1455
1456     gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1457
1458     Int_t nofStrips,nstr;
1459     Float_t r1,r2,zs;
1460     Float_t stripThick = 0.01; // 100 microns
1461     Float_t deadSpace;
1462
1463     // inner sector
1464
1465
1466     // if all lower sectors selected define only 1 strip
1467
1468     nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1469     deadSpace = fTPCParam->GetInnerWireMount();
1470
1471     dm[2] = 0.5*(250. - 5.e-3);
1472     dm[3] = 0.5 * stripThick;
1473
1474     for(nstr=0;nstr<nofStrips;nstr++){
1475
1476       r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1477       r2 = r1 + stripThick;
1478       dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1479       dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1480       zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1481       zs += r1;
1482       zs += dm[3];
1483
1484       gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1485
1486
1487     }
1488
1489     // strips only if several upper sectors selected end fSens > 0
1490
1491     if(fSecAU >=0 && fSens >0){
1492
1493     Int_t nsSave = nofStrips;
1494
1495     // outer sector
1496
1497     nofStrips = fTPCParam->GetNRowUp();
1498     deadSpace = fTPCParam->GetOuterWireMount();
1499
1500     dm[2] = 0.5*(250. - 5.e-3);
1501     dm[3] = 0.5 * stripThick;
1502
1503
1504     for(nstr=0;nstr<nofStrips;nstr++){
1505
1506       r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1507       r2 = r1 + stripThick;
1508       dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1509       dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1510       zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1511       zs += r1;
1512       zs += dm[3];
1513
1514       gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1515
1516      }
1517     }
1518
1519
1520   //-------------------------------------------------------
1521   //  positioning of the empty spaces into the main wheel
1522   //  and readout chambers and sectors into the drift gas
1523   //-------------------------------------------------------
1524
1525   Float_t rCenter,xc,yc;
1526   Float_t rInner,rOuter; // center of the inner and outer chamber
1527
1528   rCenter = rLow+dR;
1529
1530   rInner = 108.07;
1531   rOuter = 190.68;
1532
1533
1534   for(Int_t ns=0; ns<nInnerSector;ns++){
1535
1536     phi1 = ns * innerOpenAngle + innerAngleShift;
1537     phi1 *= kRaddeg; // in degrees
1538
1539     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1540
1541     if (phi1 > 360.) phi1 -= 360.;
1542
1543     theta1 = 90.;
1544     phi2   = 90.;
1545     theta2 = 180.;
1546     phi3   = ns * innerOpenAngle + innerAngleShift;
1547     phi3 *= kRaddeg; // in degrees
1548
1549     phi3 = (Float_t)TMath::Nint(phi3);
1550
1551     if(phi3 > 360.) phi3 -= 360.;
1552
1553     theta3 = 90.;
1554
1555     // "holes"->End plate
1556
1557     xc = rCenter*TMath::Cos(phi3*kDegrad);
1558     yc = rCenter*TMath::Sin(phi3*kDegrad);
1559
1560     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1561
1562     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1563
1564     // TSCE->TSWC (services wheel volumes)
1565
1566     xc = 166.142*TMath::Cos(phi3*kDegrad);
1567     yc = 166.142*TMath::Sin(phi3*kDegrad);
1568
1569     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1570     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1571
1572
1573     // readout chambers->TDGN (drift gas)
1574
1575     xc = rInner*TMath::Cos(phi3*kDegrad);
1576     yc = rInner*TMath::Sin(phi3*kDegrad);
1577
1578     gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1579
1580     // here lower sectors
1581
1582     if(fSecAL <0){
1583
1584       // all lower sectors are positioned
1585
1586       gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1587       gMC->
1588         Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1589     }
1590     else{
1591
1592       // only selected sectors are positioned (up to 6 sectors)
1593
1594       for(Int_t sel=0;sel<6;sel++){
1595
1596         if(fSecLows[sel] == ns){
1597           gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1598         }
1599         else if(fSecLows[sel] == ns+nInnerSector){
1600          gMC->
1601          Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1602         }
1603       }
1604     } // lower sectors finished
1605
1606
1607     xc = rOuter*TMath::Cos(phi3*kDegrad);
1608     yc = rOuter*TMath::Sin(phi3*kDegrad);
1609
1610     gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1611
1612     // here upper sectors
1613
1614     if(fSecAU <0){
1615
1616       // all upper sectors
1617
1618       gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1619       gMC->
1620         Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1621     }
1622     else{
1623
1624       // only selected sectors (up to 12)
1625
1626       for(Int_t sel=0;sel<12;sel++){
1627         if(fSecUps[sel] == ns+2*nInnerSector){
1628           gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1629         }
1630         else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1631          gMC->
1632           Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1633         }
1634       }
1635     } // upper sectors finished
1636
1637
1638     nRotMat++;
1639
1640     theta2 = 0.; // reflection
1641
1642     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1643
1644     xc = rInner*TMath::Cos(phi3*kDegrad);
1645     yc = rInner*TMath::Sin(phi3*kDegrad);
1646
1647     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1648
1649     xc = rOuter*TMath::Cos(phi3*kDegrad);
1650     yc = rOuter*TMath::Sin(phi3*kDegrad);
1651
1652     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1653
1654     nRotMat++;
1655
1656   }
1657   // TPMW->TPC
1658
1659   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1660   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1661
1662   //---------------------------------------------------------
1663   //  Tpc High Voltage Membrane - 100 microns of mylar
1664   //---------------------------------------------------------
1665
1666   dm[0]=82.8;
1667   dm[1]=252.;
1668   dm[2]=0.005;
1669
1670   gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1671
1672   gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1673
1674   // Tpc High Voltage membrane Holders
1675
1676   gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1677
1678
1679
1680   // inner
1681
1682   dm[0]=79.3;
1683   dm[1]=82.8;
1684   dm[2]=0.2;
1685
1686   gMC->Gsposp("THVH",1,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1687
1688   // outer
1689
1690   dm[0]= 252.;
1691   dm[1]= 257.9;
1692   dm[2]= 0.4;
1693
1694   gMC->Gsposp("THVH",2,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1695
1696   //----------------------------------------------------------
1697   // TPc Support Rods - MAKROLON
1698   //----------------------------------------------------------
1699
1700   dm[0]= 0.9;
1701   dm[1]= 1.2;
1702
1703   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1704
1705
1706   for(Int_t nrod=0;nrod<18;nrod++){
1707     Float_t angle=innerOpenAngle*(Float_t)nrod;
1708
1709     xc=81.5*TMath::Cos(angle);
1710     yc=81.5*TMath::Sin(angle);
1711
1712     dm[2]=126.7;
1713
1714     gMC->Gsposp("TPSR",nrod+1,"TDGN",xc,yc,126.9,0,"ONLY",dm,3);
1715     gMC->Gsposp("TPSR",nrod+19,"TDGN",xc,yc,-126.9,0,"ONLY",dm,3);
1716
1717     dm[2]=126.6;
1718
1719     xc=254.25*TMath::Cos(angle);
1720     yc=254.25*TMath::Sin(angle);
1721
1722     // rod number 54 contans the HV cable
1723
1724     if(nrod<17) {
1725       gMC->Gsposp("TPSR",nrod+37,"TDGN",xc,yc,127.,0,"ONLY",dm,3);
1726       gMC->Gsposp("TPSR",nrod+54,"TDGN",xc,yc,-127.,0,"ONLY",dm,3);
1727     }
1728
1729   }
1730
1731   //----------------------------------------------------------
1732   // Tpc High Voltage Rod - MAKROLON + Copper cable
1733   //----------------------------------------------------------
1734
1735   // rod with cable (Left)
1736
1737   dm[0]=0.;
1738   dm[1]=2.25;
1739   dm[2]=126.6;
1740
1741   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1742
1743   // HV cable
1744
1745   dm[0]=0.;
1746   dm[1]=0.3;
1747   dm[2]=126.6;
1748
1749   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1750
1751   // empty space
1752
1753   dm[0]=0.3;
1754   dm[1]=1.;
1755   dm[2]=126.6;
1756
1757   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1758
1759   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1760   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1761
1762   // rod without cable
1763
1764   dm[0]=1.8;
1765   dm[1]=2.25;
1766   dm[2]=126.6;
1767
1768   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1769
1770   gMC->Gspos("THVL",1,"TDGN",xc,yc,-127.,0,"ONLY");
1771   gMC->Gspos("THVR",1,"TDGN",xc,yc,127.,0,"ONLY");
1772
1773   gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1774
1775   // services wheel cover -> wheel
1776
1777
1778   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1779   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1780
1781
1782   // put the wheel into the TPC
1783
1784   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1785   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1786
1787   //
1788
1789   gMC->Gsord("TPMW",6);
1790   gMC->Gsord("TSSW",6);
1791   gMC->Gsord("TSWC",6);
1792   if(fSecAL >=0)  gMC->Gsord("TPLS",3);
1793   if(fSecAU >=0 && fSens >0)  gMC->Gsord("TPUS",3);
1794   gMC->Gsord("TDGN",6);
1795
1796   // put the TPC into ALIC (main mother volume)
1797
1798   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1799
1800
1801
1802 } // end of function
1803
1804 //_____________________________________________________________________________
1805 void AliTPCv2::DrawDetector()
1806 {
1807   //
1808   // Draw a shaded view of the Time Projection Chamber version 1
1809   //
1810
1811   // Set everything unseen
1812   gMC->Gsatt("*", "seen", -1);
1813   //
1814   // Set ALIC mother transparent
1815   gMC->Gsatt("ALIC","SEEN",0);
1816   //
1817   // Set the volumes visible
1818   //
1819
1820   gMC->Gsatt("TPC ","SEEN",0);
1821   gMC->Gsatt("TOIN","SEEN",1);
1822   gMC->Gsatt("TOIN","COLO",7);
1823   gMC->Gsatt("TOCV","SEEN",1);
1824   gMC->Gsatt("TOCV","COLO",4);
1825   gMC->Gsatt("TSA1","SEEN",0);
1826   gMC->Gsatt("TSA2","SEEN",0);
1827   gMC->Gsatt("TSA3","SEEN",0);
1828   gMC->Gsatt("TSA4","SEEN",0);
1829   gMC->Gsatt("TSA5","SEEN",0);
1830   gMC->Gsatt("TOFC","SEEN",1);
1831   gMC->Gsatt("TOFC","COLO",4);
1832   gMC->Gsatt("TSA6","SEEN",0);
1833   gMC->Gsatt("TSA7","SEEN",0);
1834   gMC->Gsatt("TSA8","SEEN",0);
1835   gMC->Gsatt("TIIN","SEEN",1);
1836   gMC->Gsatt("TIIN","COLO",7);
1837   gMC->Gsatt("TII1","SEEN",0);
1838   gMC->Gsatt("TIFC","SEEN",1);
1839   gMC->Gsatt("TIFC","COLO",4);
1840   gMC->Gsatt("TSA9","SEEN",0);
1841   gMC->Gsatt("TS10","SEEN",0);
1842   gMC->Gsatt("TS11","SEEN",0);
1843   gMC->Gsatt("TS12","SEEN",0);
1844   gMC->Gsatt("TS13","SEEN",0);
1845   gMC->Gsatt("TS14","SEEN",0);
1846   gMC->Gsatt("TICC","SEEN",0);
1847   gMC->Gsatt("TICM","SEEN",0);
1848   gMC->Gsatt("TS15","SEEN",0);
1849   gMC->Gsatt("TS16","SEEN",0);
1850   gMC->Gsatt("TS17","SEEN",0);
1851   gMC->Gsatt("TS18","SEEN",0);
1852   gMC->Gsatt("TS19","SEEN",0);
1853   gMC->Gsatt("TPJ1","SEEN",0);
1854   gMC->Gsatt("TPJ2","SEEN",0);
1855   gMC->Gsatt("TICS","SEEN",0);
1856   gMC->Gsatt("TDGN","SEEN",0);
1857   gMC->Gsatt("TIRC","SEEN",0);
1858   gMC->Gsatt("TIC1","SEEN",1);
1859   gMC->Gsatt("TIPP","SEEN",0);
1860   gMC->Gsatt("TIC3","SEEN",0);
1861   gMC->Gsatt("TRCE","SEEN",0);
1862   gMC->Gsatt("TPSC","SEEN",0);
1863   gMC->Gsatt("TPCC","SEEN",0);
1864   gMC->Gsatt("TORC","SEEN",0);
1865   gMC->Gsatt("TOPP","SEEN",0);
1866   gMC->Gsatt("TOC3","SEEN",0);
1867   gMC->Gsatt("TOC1","SEEN",1);
1868   gMC->Gsatt("TSSW","SEEN",1);
1869   gMC->Gsatt("TSWC","SEEN",1);
1870   gMC->Gsatt("TSSW","COLO",3);
1871   gMC->Gsatt("TSWC","COLO",3);
1872   gMC->Gsatt("TSCE","COLO",6);
1873   gMC->Gsatt("TSCE","SEEN",1);
1874   gMC->Gsatt("TWES","SEEN",0);
1875   gMC->Gsatt("TSWB","SEEN",0);
1876   gMC->Gsatt("TPEL","SEEN",0);
1877   gMC->Gsatt("TPMW","SEEN",1);
1878   gMC->Gsatt("TESR","SEEN",1);
1879   gMC->Gsatt("TPMW","COLO",12);
1880   gMC->Gsatt("TIC1","COLO",5);
1881   gMC->Gsatt("TOC1","COLO",5);
1882   gMC->Gsatt("TESB","SEEN",0);
1883   gMC->Gsatt("THVM","SEEN",1);
1884   gMC->Gsatt("THVM","COLO",11);
1885   gMC->Gsatt("THVH","SEEN",0);
1886   gMC->Gsatt("TPSR","SEEN",0);
1887   gMC->Gsatt("THVL","SEEN",0);
1888   gMC->Gsatt("THVC","SEEN",0);
1889   gMC->Gsatt("THVE","SEEN",0);
1890   gMC->Gsatt("THVR","SEEN",0);
1891   gMC->Gsatt("TPSS","SEEN",0);
1892   gMC->Gsatt("TPUS","SEEN",0);
1893   gMC->Gsatt("TPLS","SEEN",0);
1894
1895   //
1896   gMC->Gdopt("hide", "on");
1897   gMC->Gdopt("shad", "on");
1898   gMC->Gsatt("*", "fill", 7);
1899   gMC->SetClipBox(".");
1900   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1901   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1902   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1903   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1904   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1905   gMC->DefaultRange();
1906   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1907   gMC->Gdhead(1111, "Time Projection Chamber");
1908   gMC->Gdman(18, 4, "MAN");
1909   gMC->Gdopt("hide","off");
1910 }
1911
1912 //_____________________________________________________________________________
1913 void AliTPCv2::CreateMaterials()
1914 {
1915   //
1916   // Define materials for version 2 of the Time Projection Chamber
1917   //
1918
1919   AliTPC::CreateMaterials();
1920 }
1921
1922 //_____________________________________________________________________________
1923 void AliTPCv2::Init()
1924 {
1925   //
1926   // Initialises version 2 of the TPC after that it has been built
1927   //
1928
1929   Int_t *idtmed = fIdtmed->GetArray();
1930
1931   AliTPC::Init();
1932
1933
1934
1935   fIdSens=gMC->VolId("TPSS");
1936
1937   fIdLSec=gMC->VolId("TPLS"); // lower sector
1938   fIdUSec=gMC->VolId("TPUS"); // upper sector
1939
1940   gMC->SetMaxNStep(30000); // max. number of steps increased
1941
1942   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1943
1944   printf("%s: *** TPC version 2 initialized ***\n",ClassName());
1945   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1946
1947   //
1948
1949 }
1950
1951 //_____________________________________________________________________________
1952 void AliTPCv2::StepManager()
1953 {
1954   //
1955   // Called for every step in the Time Projection Chamber
1956   //
1957
1958   //
1959   // parameters used for the energy loss calculations
1960   //
1961   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1962   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1963   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1964
1965
1966   const Float_t kbig = 1.e10;
1967
1968   Int_t id,copy;
1969   Float_t hits[4];
1970   Int_t vol[2];
1971   TLorentzVector p;
1972
1973   vol[1]=0; // preset row number to 0
1974
1975   //
1976
1977   gMC->SetMaxStep(kbig);
1978
1979   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1980
1981   Float_t charge = gMC->TrackCharge();
1982
1983   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1984
1985   // check the sensitive volume
1986
1987   id = gMC->CurrentVolID(copy); // current volume Id
1988
1989   if ( (gMC->IsTrackEntering() || gMC->IsTrackExiting()) &&
1990        ((id == fIdLSec) || (id == fIdUSec)) ) {
1991
1992     AddTrackReference(gAlice->CurrentTrack());
1993   }
1994
1995   if(id == fIdLSec){
1996     vol[0] = copy-1; // lower sector number
1997   }
1998   else if(id == fIdUSec){
1999     vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2000   }
2001   else if(id == fIdSens && gMC->IsTrackEntering()){
2002
2003     // track is entering the sensitive strip
2004
2005     vol[1]= copy-1; // row number (absolute)
2006
2007     // sector type
2008
2009     id = gMC->CurrentVolOffID(1,copy);
2010
2011     if(id == fIdLSec){
2012
2013       // lower sector
2014
2015       vol[0] = copy-1; // sector number
2016
2017     }
2018     else {
2019
2020       // upper sector
2021
2022       vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2023       vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
2024
2025     }
2026
2027     if(vol[1] == 0){
2028
2029       // because Jouri wants to have this
2030
2031       gMC->TrackMomentum(p);
2032       hits[0]=p[0];
2033       hits[1]=p[1];
2034       hits[2]=p[2];
2035       hits[3]=0.; // this hit has no energy loss
2036       // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2037
2038       AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2039
2040     }
2041
2042      gMC->TrackPosition(p);
2043      hits[0]=p[0];
2044      hits[1]=p[1];
2045      hits[2]=p[2];
2046      hits[3]=0.; // this hit has no energy loss
2047      // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2048
2049      AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2050
2051   }
2052   else return;
2053
2054   //-----------------------------------------------------------------
2055   //  charged particle is in the sensitive volume
2056   //-----------------------------------------------------------------
2057
2058   if(gMC->TrackStep() > 0) {
2059
2060     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2061     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2062
2063     gMC->TrackPosition(p);
2064     hits[0]=p[0];
2065     hits[1]=p[1];
2066     hits[2]=p[2];
2067     hits[3]=(Float_t)nel;
2068
2069     // Add this hit
2070
2071     // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2072     if (fHitType&&2){
2073       gMC->TrackMomentum(p);
2074       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2075       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
2076       fTrackHits->SetHitPrecision(precision);
2077     }
2078     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2079
2080   }
2081
2082   // Stemax calculation for the next step
2083
2084   Float_t pp;
2085   TLorentzVector mom;
2086   gMC->TrackMomentum(mom);
2087   Float_t ptot=mom.Rho();
2088   Float_t betaGamma = ptot/gMC->TrackMass();
2089
2090   Int_t pid=gMC->TrackPid();
2091   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2092     {
2093       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2094     }
2095   else
2096     {
2097
2098       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
2099       pp=kprim*BetheBloch(betaGamma);
2100
2101       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2102     }
2103
2104   Double_t rnd = gMC->GetRandom()->Rndm();
2105
2106   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2107
2108 }
2109
2110 //_____________________________________________________________________________
2111 Float_t AliTPCv2::BetheBloch(Float_t bg)
2112 {
2113   //
2114   // Bethe-Bloch energy loss formula
2115   //
2116   const Double_t kp1=0.76176e-1;
2117   const Double_t kp2=10.632;
2118   const Double_t kp3=0.13279e-4;
2119   const Double_t kp4=1.8631;
2120   const Double_t kp5=1.9479;
2121
2122   Double_t dbg = (Double_t) bg;
2123
2124   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2125
2126   Double_t aa = TMath::Power(beta,kp4);
2127   Double_t bb = TMath::Power(1./dbg,kp5);
2128
2129   bb=TMath::Log(kp3+bb);
2130
2131   return ((Float_t)((kp2-aa-bb)*kp1/aa));
2132 }
2133
2134