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