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 1.33  2001/04/20 08:16:47  kowal2
  19 Protection against too small betaGamma. Thanks to Ivana and Yves.
  20
  21 Revision 1.32  2001/03/13 13:07:34  kowal2
  22 Corrected bug in the TPC mother volume geometry.
  23 Thanks to A. Morsch
  24
  25 Revision 1.31  2000/11/30 11:48:50  kowal2
  26 TLorentzVector.h adde to satisfy the latest changes by Federico
  27
  28 Revision 1.30  2000/11/14 10:48:57  kowal2
  29 Correct material used for TSA4. Thanks to J. Barbosa.
  30
  31 Revision 1.29  2000/11/06 17:24:10  kowal2
  32 Corrected bug in the outer containment vessel and
  33 the outer field cage geometry.
  34 Thanks to J. Barbosa.
  35
  36 Revision 1.28  2000/11/02 16:55:24  kowal2
  37 Corrected bug in the inner containment vessel geometry.
  38 Thanks to J. Belikov
  39
  40 Revision 1.27  2000/11/02 07:24:11  kowal2
  41 Correction in the TPC geometry.
  42 Changes due to the new hit structure.
  43
  44 Revision 1.26  2000/10/05 16:16:29  kowal2
  45 Corrections of the hit recording algorithm.
  46
  47 Revision 1.25  2000/10/02 21:28:18  fca
  48 Removal of useless dependecies via forward declarations
  49
  50 Revision 1.24  2000/08/28 10:02:30  kowal2
  51 Corrected bug in the StepManager
  52
  53 Revision 1.23  2000/07/10 20:57:39  hristov
  54 Update of TPC code and macros by M.Kowalski
  55
  56 Revision 1.22  2000/06/30 12:07:50  kowal2
  57 Updated from the TPC-PreRelease branch
  58
  59 Revision 1.21.2.4  2000/06/26 07:39:42  kowal2
  60 Changes to obey the coding rules
  61
  62 Revision 1.21.2.3  2000/06/25 08:38:41  kowal2
  63 Splitted from AliTPCtracking
  64
  65 Revision 1.21.2.2  2000/06/16 12:58:13  kowal2
  66 Changed parameter settings
  67
  68 Revision 1.21.2.1  2000/06/09 07:15:07  kowal2
  69
  70 Defaults loaded automatically (hard-wired)
  71 Optional parameters can be set via macro called in the constructor
  72
  73 Revision 1.21  2000/05/15 10:00:30  kowal2
  74 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
  75
  76 Revision 1.20  2000/04/17 09:37:33  kowal2
  77 removed obsolete AliTPCDigitsDisplay.C
  78
  79 Revision 1.19.8.2  2000/04/10 08:31:52  kowal2
  80
  81 Different geometry for different sectors
  82 Updated readout chambers
  83 Some modifications to StepManager by J.Belikov
  84
  85 Revision 1.19.8.1  2000/04/10 07:56:53  kowal2
  86 Not used anymore - removed
  87
  88 Revision 1.19  1999/11/04 17:28:07  fca
  89 Correct barrel part of HV Degrader
  90
  91 Revision 1.18  1999/10/14 16:52:08  fca
  92 Only use PDG codes and not GEANT ones
  93
  94 Revision 1.17  1999/10/08 06:27:23  fca
  95 Corrected bug in the HV degrader geometry, thanks to G.Tabary
  96
  97 Revision 1.16  1999/10/04 13:39:54  fca
  98 Correct array index problem
  99
 100 Revision 1.15  1999/09/29 09:24:34  fca
 101 Introduction of the Copyright and cvs Log
 102
 103 */
 104
 105 //
 106 ///////////////////////////////////////////////////////////////////////////////
 107 //                                                                           //
 108 //  Time Projection Chamber version 2 -- detailed TPC and slow simulation    //
 109 //                                                                           //
 110 //Begin_Html
 111 /*
 112 <img src="picts/AliTPCv2Class.gif">
 113 */
 114 //End_Html
 115 //                                                                           //
 116 //                                                                           //
 117 ///////////////////////////////////////////////////////////////////////////////
 118 #include <stdlib.h>
 119
 120 #include <TMath.h>
 121
 122 #include "AliTPCv2.h"
 123 #include "AliTPCDigitsArray.h"
 124 #include "AliRun.h"
 125 #include "AliMC.h"
 126 #include "AliConst.h"
 127 #include "AliPDG.h"
 128 #include "AliTPCParam.h"
 129 #include "AliTPCParamSR.h"
 130 #include "AliTPCTrackHits.h"
 131 #include "TLorentzVector.h"
 132
 133
 134 ClassImp(AliTPCv2)
 135
 136 //_____________________________________________________________________________
 137 AliTPCv2::AliTPCv2(const char *name, const char *title) :
 138   AliTPC(name, title)
 139 {
 140   //
 141   // Standard constructor for Time Projection Chamber version 2
 142   //
 143   fIdSens=0;
 144   fIdLSec=0;
 145   fIdUSec=0;
 146
 147   SetBufferSize(128000);
 148
 149   SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
 150
 151   // Default sectors
 152
 153   SetSecAL(4);
 154   SetSecAU(4);
 155   SetSecLows(1,  2,  3, 19, 20, 21);
 156   SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
 157   SetSens(1); // sensitive strips set
 158
 159   if (fTPCParam)
 160      fTPCParam->Write(fTPCParam->GetTitle());
 161 }
 162
 163 //_____________________________________________________________________________
 164 void AliTPCv2::CreateGeometry()
 165 {
 166   //
 167   // Create the geometry of Time Projection Chamber version 2
 168   //
 169   //Begin_Html
 170   /*
 171     <img src="picts/AliTPC.gif">
 172   */
 173   //End_Html
 174   //Begin_Html
 175   /*
 176     <img src="picts/AliTPCv2Tree.gif">
 177   */
 178   //End_Html
 179
 180
 181   Int_t *idtmed = fIdtmed->GetArray();
 182
 183   Float_t dm[50];
 184   Int_t idrotm[120];
 185
 186   Int_t nRotMat = 0;
 187
 188   Int_t i,ifl1=0;
 189
 190   // number of sectors
 191
 192   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 193   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 194
 195   // ---------------------------------------------------
 196   //        sector specification check
 197   // ---------------------------------------------------
 198   if (fSecAL >= 0) {
 199     ifl1 = 0;
 200
 201     for (i = 0; i < 6; ++i) {
 202       if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
 203         ifl1 = 1;
 204         printf("*** SECTOR %d selected\n",fSecLows[i]);
 205       }
 206     }
 207
 208   } else {
 209     printf("*** ALL LOWER SECTORS SELECTED ***\n");
 210     ifl1 = 1;
 211   }
 212
 213   if (ifl1 == 0) {
 214     printf("*** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n");
 215     printf("!!! PROGRAM STOPPED !!!\n");
 216     exit(1);
 217   }
 218
 219   if (fSecAU >= 0) {
 220
 221     for (i = 0; i < 12; ++i) {
 222       if (fSecUps[i] > 2*nInnerSector-1 &&
 223           fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
 224         printf("*** SECTOR %d selected\n",fSecUps[i]);
 225       }
 226     }
 227
 228   } else {
 229     printf("*** ALL UPPER SECTORS SELECTED ***\n");
 230   }
 231
 232
 233
 234   //--------------------------------------------------------------------
 235
 236   //
 237   //  Mother volume (Air) - all volumes will be positioned in it
 238   //
 239
 240   dm[0]=0.;
 241   dm[1]=360.;
 242   dm[2]=12.;
 243
 244   //
 245
 246   dm[3]= -283.7;
 247   dm[4]= 66.2;
 248   dm[5]= 277.95;
 249
 250   //
 251
 252   dm[6]= -255.6;
 253   dm[7]= 66.2;
 254   dm[8]= 277.95;
 255
 256   //
 257
 258   dm[9]= -73.3;
 259   dm[10]= 59.0;
 260   dm[11]= 277.95;
 261
 262   //
 263
 264   dm[12]= -73.3;
 265   dm[13]= 56.9;
 266   dm[14]= 277.95;
 267
 268   //
 269
 270   dm[15]= -72.1;
 271   dm[16]= 56.9;
 272   dm[17]= 277.95;
 273
 274   //
 275
 276   dm[18]= -72.1;
 277   dm[19]= 60.65;
 278   dm[20]= 277.95;
 279
 280   //
 281
 282   dm[21]= 72.1;
 283   dm[22]= 60.65;
 284   dm[23]= 277.95;
 285
 286   //
 287
 288   dm[24]= 72.1;
 289   dm[25]= 56.9;
 290   dm[26]= 277.95;
 291
 292   //
 293
 294   dm[27]= 73.3;
 295   dm[28]= 56.9;
 296   dm[29]= 277.95;
 297
 298   //
 299
 300   dm[30]= 73.3;
 301   dm[31]= 59.;
 302   dm[32]= 277.95;
 303
 304   //
 305
 306   dm[33]= 250.4;
 307   dm[34]= 66.0;
 308   dm[35]= 277.95;
 309
 310   //
 311
 312   dm[36]= 283.7;
 313   dm[37]= 66.0;
 314   dm[38]= 277.95;
 315
 316
 317   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
 318
 319
 320   //-------------------------------------------------------------------
 321   //  Tpc Outer INsulator (CO2)
 322   //-------------------------------------------------------------------
 323
 324   dm[0]= 0.;
 325   dm[1]= 360.;
 326   dm[2]= 6.;
 327
 328   //
 329
 330   dm[3]= -253.6;
 331   dm[4]= 258.;
 332   dm[5]= 266.65;
 333
 334   //
 335
 336   dm[6]= -253.;
 337   dm[7]= 258.;
 338   dm[8]= 266.65;
 339
 340   dm[9]= -253.;
 341   dm[10]= 258.;
 342   dm[11]= 277.97;
 343
 344   dm[12]= 253.6;
 345   dm[13]= 258.;
 346   dm[14]= 277.97;
 347
 348   //
 349
 350   dm[15]= 253.6;
 351   dm[16]= 265.2;
 352   dm[17]= 277.95;
 353
 354   //
 355
 356   dm[18]= 255.6;
 357   dm[19]= 265.2;
 358   dm[20]= 277.95;
 359
 360
 361   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 362
 363   //---------------------------------------------------------------
 364   // shreds (G10) - TPC Rings
 365   //---------------------------------------------------------------
 366
 367   gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
 368
 369   dm[0]= 258.;
 370   dm[1]= 266.65;
 371   dm[2]= 0.3;
 372
 373   gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
 374
 375   //
 376
 377   dm[0]= 258.;
 378   dm[1]= 270.9;
 379   dm[2]= 0.3;
 380
 381   gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
 382
 383   //
 384
 385   dm[0]= 272.2;
 386   dm[1]= 277.95;
 387   dm[2]= 0.3;
 388
 389   gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
 390
 391   //----------------------------------------------------------------
 392   // Tpc Outer Contaiment Vessel
 393   //  mother volume - Al, daughters - composite (sandwich)
 394   //----------------------------------------------------------------
 395
 396   dm[0]= 0.;
 397   dm[1]= 360.;
 398   dm[2]=6.;
 399
 400   //
 401
 402   dm[3]= -250.4;
 403   dm[4]= 272.2;
 404   dm[5]= 277.95;
 405
 406   //
 407
 408   dm[6]= -248.4;
 409   dm[7]= 272.2;
 410   dm[8]= 277.95;
 411
 412   //
 413   dm[9]= -248.4;
 414   dm[10]= 274.81;
 415   dm[11]= 277.95;
 416   //
 417
 418   dm[12]= 253.6;
 419   dm[13]= 274.81;
 420   dm[14]= 277.95;
 421
 422   //
 423
 424   dm[15]= 253.6;
 425   dm[16]= 265.2;
 426   dm[17]= 277.95;
 427
 428   //
 429
 430   dm[18]= 255.6;
 431   dm[19]= 265.2;
 432   dm[20]= 277.95;
 433
 434   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 435
 436   // Daughter volumes
 437
 438   // Tpc SAndwich 1 - Al
 439
 440   dm[0]= 274.81;
 441   dm[1]= 277.95;
 442   dm[2]= 251.7;
 443
 444   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 445
 446   // Tpc SAndwich 2 - Tedlar
 447
 448   dm[0] += 5.e-3;
 449   dm[1] -= 5.e-3;
 450
 451   gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
 452
 453   // Tpc SAndwich 3 - Kevlar
 454
 455   dm[0] += 5e-3;
 456   dm[1] -= 5.e-3;
 457
 458   gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
 459
 460   // Tpc SAndwich 4 - NOMEX honeycomb
 461
 462   dm[0] += 0.06;
 463   dm[1] -= 0.06;
 464
 465   gMC->Gsvolu("TSA4","TUBE",idtmed[6],dm,3);
 466
 467   // 4->3->2->1->TOCV
 468
 469   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 470   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 471   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 472
 473   gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
 474
 475   // TCOV-> TOIN
 476
 477   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 478
 479   //-------------------------------------------------------
 480   //  Tpc Outer Field Cage
 481   //  mother volume - Al, daughters - composite (sandwich)
 482   //-------------------------------------------------------
 483
 484   dm[0]=0.;
 485   dm[1]=360.;
 486   dm[2]=6.;
 487
 488   dm[3]= -253.;
 489   dm[4]= 258.;
 490   dm[5]= 277.95;
 491
 492   //
 493
 494   dm[6]= -251.;
 495   dm[7]= 258.;
 496   dm[8]= 277.95;
 497
 498   //
 499
 500   dm[9]= -251.;
 501   dm[10]= 258.;
 502   dm[11]= 260.05;
 503
 504   //
 505
 506   dm[12]= 251.;
 507   dm[13]= 258.;
 508   dm[14]= 260.05;
 509
 510   //
 511
 512   dm[15]= 251.;
 513   dm[16]= 258.;
 514   dm[17]= 270.9;
 515
 516   //
 517
 518   dm[18]= 253.;
 519   dm[19]= 258.;
 520   dm[20]= 270.9;
 521
 522   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 523
 524   // Daughter volumes
 525
 526   // Tpc SAndwich 5 - Tedlar
 527
 528   dm[0]= 258.;
 529   dm[1]= 260.05;
 530   dm[2]= 251.7;
 531
 532   gMC->Gsvolu("TSA5","TUBE",idtmed[9],dm,3);
 533
 534   // Tpc SAndwich 6 - Kevlar
 535
 536   dm[0] += 5.e-3;
 537   dm[1] -= 5.e-3;
 538
 539   gMC->Gsvolu("TSA6","TUBE",idtmed[5],dm,3);
 540
 541
 542   // Tpc SAndwich 8 - NOMEX
 543
 544   dm[0] += 0.02;
 545   dm[1] -= 0.02;
 546
 547   gMC->Gsvolu("TSA7","TUBE",idtmed[6],dm,3);
 548
 549   // 7->6->5->TOFC
 550
 551   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 552   gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY");
 553
 554   gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
 555
 556   // TOFC->TOIN
 557
 558   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 559
 560   // TOIN->TPC
 561
 562   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 563
 564   //--------------------------------------------------------------------
 565   // Tpc Inner INsulator (CO2)
 566   //--------------------------------------------------------------------
 567
 568
 569   dm[0]=0.;
 570   dm[1]= 360.;
 571   dm[2]= 15.;
 572
 573   //
 574
 575   dm[3]= -255.6;
 576   dm[4]= 66.2;
 577   dm[5]= 74.8;
 578
 579   //
 580
 581   Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
 582
 583   dm[6]= -253.6;
 584   dm[7]= 59.0+ (253.6-73.3)*tanL;
 585   dm[8]= 74.8;
 586
 587   //
 588
 589   dm[9]= -253.6;
 590   dm[10]= dm[7];
 591   dm[11]= 79.2;
 592
 593   //
 594
 595   dm[12]= -73.3;
 596   dm[13]= 59.0;
 597   dm[14]= 79.2;
 598
 599   //
 600
 601   dm[15]= -73.3;
 602   dm[16]= 56.9;
 603   dm[17]= 79.2;
 604
 605   //
 606
 607   dm[18]= -72.1;
 608   dm[19]= 59.6;
 609   dm[20]= 79.2;
 610
 611   //
 612
 613   dm[21]= -72.1;
 614   dm[22]= 60.65;
 615   dm[23]= 79.2;
 616
 617   //
 618
 619   dm[24]= 72.1;
 620   dm[25]= 60.65;
 621   dm[26]= 79.2;
 622
 623   //
 624
 625   dm[27]= 72.1;
 626   dm[28]= 59.6;
 627   dm[29]= 79.2;
 628
 629   //
 630
 631   dm[30]= 73.3;
 632   dm[31]= 56.9;
 633   dm[32]= 79.2;
 634
 635   //
 636
 637   dm[33]= 73.3;
 638   dm[34]= 59.0;
 639   dm[35]= 79.2;
 640
 641   //
 642
 643   dm[36]= 250.4;
 644   dm[37]= 66.0;
 645   dm[38]= 79.2;
 646
 647   //
 648
 649   dm[39]= 253.0;
 650   dm[40]= 66.0;
 651   dm[41]= 79.2;
 652
 653   //
 654
 655   dm[42]= 253.0;
 656   dm[43]= 75.3;
 657   dm[44]= 79.2;
 658
 659   //
 660
 661   dm[45]= 253.6;
 662   dm[46]= 75.3;
 663   dm[47]= 79.2;
 664
 665   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
 666
 667
 668   //--------------------------------------------------------------------
 669   //  Tpc Inner Containment vessel, Left part
 670   //  mother volume - Al, daughter - composite (sandwich)
 671   //--------------------------------------------------------------------
 672
 673   dm[0]= 0.;
 674   dm[1]= 360.;
 675   dm[2]= 8.;
 676
 677   //
 678
 679   dm[3]= -255.6;
 680   dm[4]= 66.2;
 681   dm[5]= 74.8;
 682
 683   //
 684
 685   Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
 686   Float_t sandThick = 2.14; // cone composite thickness
 687
 688
 689   //
 690
 691   dm[6]= -253.6;
 692   dm[7]= 59.0 + (253.6-73.3)*tanL;
 693   dm[8]= 74.8;
 694
 695   //
 696
 697   dm[9]= -253.6;
 698   dm[10]= dm[7];
 699   dm[11]= dm[7]+sandThick/cosL;
 700
 701   //
 702
 703   dm[12]= -75.6;
 704   dm[13]= 59.0+(75.6-73.3)*tanL;
 705   dm[14]= dm[13]+sandThick/cosL;
 706
 707   //
 708
 709   dm[15]= -75.6;
 710   dm[16]= dm[13];
 711   dm[17]= 60.65;
 712
 713   //
 714
 715   dm[18]= -73.3;
 716   dm[19]= 59.0;
 717   dm[20]= 60.65;
 718
 719   //
 720
 721   dm[21]= -73.3;
 722   dm[22]= 56.9;
 723   dm[23]= 60.65;
 724
 725   //
 726
 727   dm[24]= -72.1;
 728   dm[25]= 56.9;
 729   dm[26]= 60.65;
 730
 731   gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
 732
 733   // Daughter volumes
 734
 735   // Tpc SAndwich 9 - Al
 736
 737   dm[0]= 0.;
 738   dm[1]= 360.;
 739   dm[2]= 2.;
 740
 741   //
 742
 743   dm[3]= - 254.3;
 744   dm[4]= 59.0+(254.3-73.3)*tanL;
 745   dm[5]= dm[4]+sandThick/cosL;
 746
 747   //
 748
 749   dm[6]= -78.3;
 750   dm[7]= 59.0+(78.3-73.3)*tanL;
 751   dm[8]= dm[7]+sandThick/cosL;
 752
 753   //
 754
 755   gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
 756
 757   // Tpc SAndwich 10 - Tedlar
 758
 759   dm[4]+= 5.e-3/cosL;
 760   dm[5]-= 5.e-3/cosL;
 761
 762   //
 763
 764   dm[7]+= 5.e-3/cosL;
 765   dm[8]+= 5.e-3/cosL;
 766
 767   gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9);
 768
 769   // Tpc SAndwich 11 - Kevlar
 770
 771   dm[4]+= 5.e-3/cosL;
 772   dm[5]-= 5.e-3/cosL;
 773
 774   //
 775
 776   dm[7]+= 5.e-3/cosL;
 777   dm[8]+= 5.e-3/cosL;
 778
 779   gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9);
 780
 781   // Tpc SAndwich 12 - NOMEX
 782
 783   dm[4]+= 0.06/cosL;
 784   dm[5]-= 0.06/cosL;
 785
 786   //
 787
 788   dm[7]+= 0.06/cosL;
 789   dm[8]+= 0.06/cosL;
 790
 791   gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);
 792
 793   // 12->11->10->9
 794
 795   gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
 796   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 797   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 798
 799   // TSA9->TICL
 800
 801   gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
 802
 803   //--------------------------------------------------------------------
 804   //  Tpc Inner Containment vessel, Right part
 805   //  mother volume - Al, daughter - composite (sandwich)
 806   //--------------------------------------------------------------------
 807
 808   dm[0]= 0.;
 809   dm[1]= 360.;
 810   dm[2]=8.;
 811
 812   //
 813
 814   dm[3]= 72.1;
 815   dm[4]= 56.9;
 816   dm[5]= 60.65;
 817
 818   //
 819
 820   dm[6]= 73.3;
 821   dm[7]= 56.9;
 822   dm[8]= 60.65;
 823
 824   //
 825
 826   dm[9]= 73.3;
 827   dm[10]= 59.0;
 828   dm[11]= 60.65;
 829
 830   //
 831
 832   Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
 833   Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
 834
 835   //
 836
 837   dm[12]= 75.6;
 838   dm[13]= 59.0+(75.6-73.3)*tanR;
 839   dm[14]= 60.65;
 840
 841   //
 842
 843   dm[15]= 75.6;
 844   dm[16]= dm[13];
 845   dm[17]= dm[16]+sandThick/cosR;
 846
 847   //
 848
 849   dm[18]= 248.4;
 850   dm[19]= 59.0+(248.4-73.3)*tanR;
 851   dm[20]= dm[19]+sandThick/cosR;
 852
 853   //
 854
 855   dm[21]= 248.4;
 856   dm[22]= dm[19];
 857   dm[23]= 70.2;
 858
 859   //
 860
 861   dm[24]= 250.4;
 862   dm[25]= 66.0;
 863   dm[26]= 70.2;
 864
 865   gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
 866
 867
 868
 869   // Daughter volumes
 870
 871   // Tpc SAndwich 13 - Al
 872
 873   dm[0]= 0.;
 874   dm[1]= 360.;
 875   dm[2]= 2.;
 876
 877   //
 878
 879   dm[3]= 78.3;
 880   dm[4]= 59.0+(78.3-73.3)*tanR;
 881   dm[5]= dm[4]+sandThick/cosR;
 882
 883   //
 884
 885   dm[6]= 249.1;
 886   dm[7]= 59.0+(249.1-73.3)*tanR;
 887   dm[8]= dm[7]+sandThick/cosR;
 888
 889   //
 890
 891   gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
 892
 893   // Tpc SAndwich 14 - Tedlar
 894
 895   dm[4]+= 5.e-3/cosR;
 896   dm[5]-= 5.e-3/cosR;
 897
 898   //
 899
 900   dm[7]+= 5.e-3/cosR;
 901   dm[8]+= 5.e-3/cosR;
 902
 903   gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9);
 904
 905   // Tpc SAndwich 15 - Kevlar
 906
 907   dm[4]+= 5.e-3/cosR;
 908   dm[5]-= 5.e-3/cosR;
 909
 910   //
 911
 912   dm[7]+= 5.e-3/cosR;
 913   dm[8]+= 5.e-3/cosR;
 914
 915   gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9);
 916
 917   // Tpc SAndwich 16 - NOMEX
 918
 919   dm[4]+= 0.06/cosR;
 920   dm[5]-= 0.06/cosR;
 921
 922   //
 923
 924   dm[7]+= 0.06/cosR;
 925   dm[8]+= 0.06/cosR;
 926
 927   gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);
 928
 929   // 16->15->14->13
 930
 931   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 932   gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
 933   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 934
 935   // TS12->TICR
 936
 937   gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
 938
 939   //------------------------------------------------------
 940   // Tpc Inner Field Cage
 941   // mother volume - Al, daughters - composite (sandwich)
 942   //------------------------------------------------------
 943
 944   dm[0]= 0.;
 945   dm[1]= 360.;
 946   dm[2]=6.;
 947
 948   //
 949
 950   dm[3]= -253.0;
 951   dm[4]= 70.7;
 952   dm[5]= 79.2;
 953
 954   //
 955
 956   dm[6]= -251.0;
 957   dm[7]= 70.7;
 958   dm[8]= 79.2;
 959
 960   //
 961
 962   dm[9]= -251.0;
 963   dm[10]= 77.15;
 964   dm[11]= 79.2;
 965
 966   //
 967
 968   dm[12]= 251.0;
 969   dm[13]= 77.15;
 970   dm[14]= 79.2;
 971
 972   //
 973
 974   dm[15]= 251.0;
 975   dm[16]= 66.0;
 976   dm[17]= 79.2;
 977
 978   //
 979
 980   dm[18]= 253.0;
 981   dm[19]= 66.0;
 982   dm[20]= 79.2;
 983
 984   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
 985
 986   // Daughter volumes
 987
 988   // Tpc Sandwich 17 - Tedlar
 989
 990   dm[0]= 77.15;
 991   dm[1]= 79.2;
 992   dm[2]= 251.7;
 993
 994   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 995
 996   // Tpc Sandwich 18 - Kevlar
 997
 998   dm[0]+= 5.e-3;
 999   dm[1]-= 5.e-3;
1000
1001   gMC->Gsvolu("TS18","TUBE",idtmed[5],dm,3);
1002
1003
1004   // Tpc Sandwich 19 - NOMEX
1005
1006   dm[0]+= 0.02;
1007   dm[1]-= 0.02;
1008
1009   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
1010
1011   // 19->18->17
1012
1013   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
1014   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
1015
1016   // TS17->TIFC
1017
1018   gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
1019
1020   // TPC Rings
1021
1022   dm[0]= 70.7;
1023   dm[1]= 79.2;
1024   dm[2]= 0.3;
1025
1026   gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
1027
1028   dm[0]= 66.0;
1029   dm[1]= 70.2;
1030
1031   gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
1032
1033   dm[0]= 75.3;
1034   dm[1]= 79.2;
1035
1036   gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);
1037
1038   // TICL->TIIN
1039
1040   gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
1041
1042   // TICR->TIIN
1043
1044   gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
1045
1046   // TIFC->TIIN
1047
1048   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
1049
1050   // Tpc Sandwich 21 - Al (central barrel)
1051
1052   dm[0]= 60.65;
1053   dm[1]= 61.21;
1054   dm[2]= 75.2;
1055
1056   gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
1057
1058   // Tpc Sandwich 22 - Tedlar (central barrel)
1059
1060   dm[0]+= 5.e-3;
1061   dm[1]-= 5.e-3;
1062
1063   gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3);
1064
1065   // Tpc Sandwich 23 - Kevlar (central barrel)
1066
1067   dm[0]+= 5.e-3;
1068   dm[1]-= 5.e-3;
1069
1070   gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3);
1071
1072   // Tpc Sandwich 24 - NOMEX (central barrel)
1073
1074   dm[0]+= 0.02;
1075   dm[1]-= 0.02;
1076
1077   gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3);
1078
1079   // 24->23->22->21
1080
1081   gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1082   gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1083   gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1084
1085   gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1086
1087   // put everything into the TPC
1088
1089   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1090
1091
1092   //---------------------------------------------------------
1093   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1094   //  and its daughters (HV membrane, rods, readout chambers)
1095   //---------------------------------------------------------
1096
1097   dm[0]= 79.2;
1098   dm[1]= 258.0;
1099   dm[2]= 253.6;
1100
1101   gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);  // nonsensitive
1102
1103     // sector opening angles
1104
1105   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1106   Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1107
1108   // sector angle shift
1109
1110   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1111
1112   // All above parameters are identical for inner and outer
1113   // sectors. The distinction is kept for the historical reasons
1114   // and eventually will disappear.
1115
1116   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1117   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1118   Float_t space;
1119
1120   //-------------------------------------------------------------------------
1121   //   Tpc Inner Readout Chambers
1122   //-------------------------------------------------------------------------
1123
1124   dm[0]= 14.483;
1125   dm[1]= 23.3345;
1126   dm[2]= 1.6; // thickness
1127   dm[3]= 25.1;
1128
1129   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1130
1131   // this volume will be positioned in the empty space
1132   // of the end-cap to avoid overlaps
1133
1134   dm[0]= 13.7305;
1135   dm[1]= 21.1895;
1136   dm[2]= 2.25;
1137   dm[3]= 21.15;
1138
1139   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1140
1141   //------------------------------------------------
1142   // Tpc Inner readout chamber Pad Plane
1143   //------------------------------------------------
1144
1145   dm[0]= 14.483;
1146   dm[1]= 23.3345;
1147   dm[2]= 0.5;
1148   dm[3]= 25.1;
1149
1150   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1151
1152   //
1153
1154   dm[0] -= 1.218511934;
1155   dm[1] -= 1.218511934;
1156   dm[2] = 0.35;
1157
1158   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1159
1160   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1161
1162   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1163
1164   //----------------------------------------------
1165   // Tpc Readout Chambers Empty spaces - for both
1166   // inner and outer sectors
1167   //----------------------------------------------
1168
1169   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1170
1171   // Inner sector - 4 spaces
1172
1173
1174   dm[3] = 4.7625;
1175   dm[0] = 12.472;
1176
1177   Float_t rr = 90.52;
1178   Float_t zz;
1179
1180   zz= -12.7875;
1181
1182   space = rr*tanAlpha-dm[0];
1183
1184   for(Int_t nsLow=0;nsLow<4;nsLow++){
1185
1186     rr += 9.525;
1187     dm[1]= rr*tanAlpha - space;
1188
1189     dm[2]=0.8;
1190
1191     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1192
1193     //
1194
1195     dm[2]= 1.2;
1196
1197     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1198
1199     rr += 0.4;
1200     dm[0] = rr*tanAlpha - space;
1201     zz += (0.4+9.525);
1202
1203   }
1204
1205   dm[0]= 12.472;
1206   // dm[1] - this is the dm[1] from the previous TRCE
1207   dm[2]= 1.05;
1208   dm[3]= 19.65;
1209
1210   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1211
1212   //
1213   // TPc Space for Connectors
1214   //
1215
1216   dm[0]= .3;
1217   dm[1]= .3;
1218   dm[2]= 4.5;
1219
1220   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1221
1222   // TPC Connectors
1223
1224   dm[0]= .25;
1225   dm[1]= .15;
1226   dm[2]= 3.75;
1227
1228   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1229
1230   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1231
1232   zz = -12.7875;
1233
1234   Float_t alpha;
1235   Float_t astep;
1236
1237   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1238
1239   // inner part of the inner sector - 2 x 20 holes
1240
1241   astep = 20.00096874/19.;
1242
1243   alpha = 10.00048437-astep;
1244
1245   Float_t x1,x2;
1246
1247     x1 = 13.31175725;
1248     x1 -= 0.996357832;
1249
1250     x2 = 15.06180253;
1251     x2 -= 1.163028812;
1252
1253   Int_t ncon;
1254
1255   for(ncon=0;ncon<20;ncon++){
1256
1257     phi1 = 0.;
1258     theta1 = 90.+alpha;
1259     phi2=90.;
1260     theta2 = 90.;
1261     phi3 = (alpha>0) ? 0. : 180.;
1262     theta3 = TMath::Abs(alpha);
1263
1264     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1265
1266
1267
1268     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1269     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1270
1271
1272     x1 -= 1.296357833;
1273     x2 -= 1.463028812;
1274
1275     alpha -= astep;
1276     nRotMat++;
1277
1278   }
1279
1280   // outer part of the inner sector - 2 x 25 holes
1281
1282    astep = 20.00096874/24.;
1283    alpha = 10.00048437-astep;
1284
1285    x1 = 16.81184781;
1286    x1 -= 1.016295986;
1287
1288    x2 = 18.5618931;
1289    x2 -= 1.150914854;
1290
1291   for(ncon=0;ncon<25;ncon++){
1292
1293     phi1 = 0.;
1294     theta1 = 90.+alpha;
1295     phi2=90.;
1296     theta2 = 90.;
1297     phi3 = (alpha>0) ? 0. : 180.;
1298     theta3 = TMath::Abs(alpha);
1299
1300     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1301
1302
1303
1304     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1305     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1306
1307
1308     x1 -= 1.316295986;
1309     x2 -= 1.450914854;
1310
1311     alpha -= astep;
1312     nRotMat++;
1313
1314   }
1315
1316   //--------------------------------------------------------------------------
1317   //  TPC Outer Readout Chambers
1318   //  this is NOT a final design
1319   //--------------------------------------------------------------------------
1320
1321   dm[0]= 23.3875;
1322   dm[1]= 43.524;
1323   dm[2]= 1.5; //thickness
1324   dm[3]= 57.1;
1325
1326   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1327
1328   //------------------------------------------------
1329   // Tpc Outer readout chamber Pad Plane
1330   //------------------------------------------------
1331
1332   dm[2]= 0.5;
1333
1334   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1335
1336   dm[0] -= 1.218511934;
1337   dm[1] -= 1.218511934;
1338   dm[2] = 0.35;
1339
1340   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1341
1342   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1343
1344   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1345
1346   // empty space
1347
1348
1349   dm[0]= 21.035;
1350   dm[1]= 38.7205;
1351   dm[2]= 0.7;
1352   dm[3]= 50.15;
1353
1354   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1355
1356   dm[0]= 22.2935;
1357   dm[1]= 40.5085;
1358   dm[2]= 2.25;
1359   dm[3]= 51.65;
1360
1361   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1362
1363   dm[0]= 21.35;
1364   dm[1]= 38.7205;
1365   dm[2]= 2.25;
1366   dm[3]= 50.15;
1367
1368   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1369
1370
1371
1372   //-----------------------------------------------
1373   // Tpc Services Support Wheel
1374   //-----------------------------------------------
1375
1376   dm[0]=0.;
1377   dm[1]=360.;
1378   dm[2]=18.;
1379   dm[3]=2.;
1380
1381   dm[4]= -5.;
1382   dm[5]= 77.017;
1383   dm[6]= 255.267;
1384
1385   dm[7]= 5.;
1386   dm[8]= dm[5];
1387   dm[9]= dm[6];
1388
1389   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1390
1391   // Tpc Services Wheel Cover
1392
1393   dm[4]= -0.5;
1394   dm[7]= 0.5;
1395
1396   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1397
1398   // Tpc Service wheel Cover Empty space
1399
1400   dm[0]= 10.99;
1401   dm[1]= 39.599;
1402   dm[2]= .5;
1403   dm[3]= 81.125;
1404
1405   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1406
1407   // Tpc services Wheel Empty Spaces
1408
1409   dm[0]= 13.18017507;
1410   dm[1]= 44.61045938;
1411   dm[2]= 4.;
1412   dm[3]= 89.125;
1413
1414   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1415
1416   // Tpc Services Wheel Bars
1417
1418   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1419
1420   // bars-> TWES
1421
1422   dm[2]= 4.;
1423   dm[3]= .4;
1424
1425   dm[0]= 13.8149522;
1426   dm[1]= 13.95601379;
1427
1428   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1429
1430   dm[0]= 43.83462067;
1431   dm[1]= 43.97568225;
1432
1433   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1434
1435   // TPc ELectronics - right now 30% X0 Si
1436
1437   dm[0]= 14.03813696;
1438   dm[1]= 43.3524075;
1439   dm[2]= 1.404;
1440   dm[3]= 83.125;
1441
1442   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1443   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1444
1445   //--------------------------------------------------------------------------
1446   //  End caps
1447   //--------------------------------------------------------------------------
1448
1449   // TPc Main Wheel - Al
1450
1451   dm[0]= 75.3;
1452   dm[1]= 264.8;
1453   dm[2]= 3.0;
1454
1455   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1456
1457   // TPc Extra Wheel (to avoid overlapping) - Al
1458
1459   dm[0]= 264.8;
1460   dm[1]= 277.0;
1461   dm[2]= 1.95;
1462
1463   gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1464
1465   //--------------------------------------------------------------------------
1466   //  Tpc Empty Space for the Readout chambers
1467   //--------------------------------------------------------------------------
1468
1469   Float_t rLow= 86.2;
1470   Float_t rUp= 243.5;
1471   Float_t dR = 0.5*(rUp-rLow);
1472
1473   space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1474
1475   dm[0]= rLow*tanAlpha-space;
1476   dm[1]= rUp*tanAlpha-space;
1477   dm[2]= 3.0;
1478   dm[3]= dR;
1479
1480   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1481
1482   // TIC1->TESR
1483
1484
1485   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1486
1487
1488   // TOC1->TESR
1489
1490   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1491
1492   // Tpc Empty Space Bars - Al (daughters of TESR)
1493
1494   Float_t zBar;
1495
1496   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1497
1498   // lower bar
1499
1500   dm[0]= rLow*tanAlpha-space;
1501   dm[1]= 88.7*tanAlpha-space;
1502   dm[2]= 0.95;
1503   dm[3]= 1.275;
1504
1505   zBar = -dR+dm[3];
1506
1507   gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1508
1509   // middle bar
1510
1511   dm[0]= 131.65*tanAlpha-space;
1512   dm[1]= 136.5*tanAlpha-space;
1513   dm[3]= 2.425;
1514
1515   zBar = -dR +131.65+dm[3]-rLow;
1516
1517   gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1518
1519   // upper bar
1520
1521   dm[0]= 240.4*tanAlpha-space;
1522   dm[1]= rUp*tanAlpha-space;
1523   dm[3]= 1.55;
1524
1525   zBar = dR-dm[3];
1526
1527   gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1528
1529   //------------------------------------------------------
1530   //  TPc Lower "S" Sectors
1531   //------------------------------------------------------
1532
1533
1534   Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1535   Float_t inSecUpEdge =  fTPCParam->GetInnerRadiusUp();
1536
1537   dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1538   dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1539   dm[2] = 0.5*(250. - 0.3);
1540   dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1541
1542   gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1543
1544   //----------------------------------------------------------
1545   //  TPc Upper Sectors
1546   //----------------------------------------------------------
1547
1548   Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1549   Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1550
1551   dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1552   dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1553   dm[2] = 0.5*(250. - 0.3);
1554   dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1555
1556   gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1557
1558
1559
1560
1561     gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1562
1563     Int_t nofStrips,nstr;
1564     Float_t r1,r2,zs;
1565     Float_t stripThick = 0.01; // 100 microns
1566     Float_t deadSpace;
1567
1568     // inner sector
1569
1570
1571     // if all lower sectors selected define only 1 strip
1572
1573     nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1574     deadSpace = fTPCParam->GetInnerWireMount();
1575
1576     dm[2] = 0.5*(250. - 0.3);
1577     dm[3] = 0.5 * stripThick;
1578
1579
1580     for(nstr=0;nstr<nofStrips;nstr++){
1581
1582       r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1583       r2 = r1 + stripThick;
1584       dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1585       dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1586       zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1587       zs += r1;
1588       zs += dm[3];
1589
1590       gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1591
1592
1593     }
1594
1595     // strips only if several upper sectors selected end fSens > 0
1596
1597     if(fSecAU >=0 && fSens >0){
1598
1599     Int_t nsSave = nofStrips;
1600
1601     // outer sector
1602
1603     nofStrips = fTPCParam->GetNRowUp();
1604     deadSpace = fTPCParam->GetOuterWireMount();
1605
1606     dm[2] = 0.5*(250. - 0.3);
1607     dm[3] = 0.5 * stripThick;
1608
1609
1610     for(nstr=0;nstr<nofStrips;nstr++){
1611
1612       r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1613       r2 = r1 + stripThick;
1614       dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1615       dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1616       zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1617       zs += r1;
1618       zs += dm[3];
1619
1620       gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1621
1622      }
1623     }
1624
1625   //-------------------------------------------------------
1626   //  positioning of the empty spaces into the main wheel
1627   //  and readout chambers and sectors into the drift gas
1628   //-------------------------------------------------------
1629
1630   Float_t rCenter,xc,yc;
1631   Float_t rInner,rOuter; // center of the inner and outer chamber
1632
1633   rCenter = rLow+dR;
1634
1635   rInner = 108.07;
1636   rOuter = 190.68;
1637
1638   for(Int_t ns=0; ns<nInnerSector;ns++){
1639
1640     phi1 = ns * innerOpenAngle + innerAngleShift;
1641     phi1 *= kRaddeg; // in degrees
1642
1643     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1644
1645     if (phi1 > 360.) phi1 -= 360.;
1646
1647     theta1 = 90.;
1648     phi2   = 90.;
1649     theta2 = 180.;
1650     phi3   = ns * innerOpenAngle + innerAngleShift;
1651     phi3 *= kRaddeg; // in degrees
1652
1653     phi3 = (Float_t)TMath::Nint(phi3);
1654
1655     if(phi3 > 360.) phi3 -= 360.;
1656
1657     theta3 = 90.;
1658
1659     // "holes"->End plate
1660
1661     xc = rCenter*TMath::Cos(phi3*kDegrad);
1662     yc = rCenter*TMath::Sin(phi3*kDegrad);
1663
1664     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1665
1666     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1667
1668     // TSCE->TSWC (services wheel volumes)
1669
1670     xc = 166.142*TMath::Cos(phi3*kDegrad);
1671     yc = 166.142*TMath::Sin(phi3*kDegrad);
1672
1673     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1674     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1675
1676     // readout chambers->TDGN (drift gas)
1677
1678     xc = rInner*TMath::Cos(phi3*kDegrad);
1679     yc = rInner*TMath::Sin(phi3*kDegrad);
1680
1681     gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1682
1683     // here lower sectors
1684
1685     if(fSecAL <0){
1686
1687       // all lower sectors are positioned
1688
1689       gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1690       gMC->
1691         Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1692     }
1693     else{
1694
1695       // only selected sectors are positioned (up to 6 sectors)
1696
1697       for(Int_t sel=0;sel<6;sel++){
1698
1699         if(fSecLows[sel] == ns){
1700           gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1701         }
1702         else if(fSecLows[sel] == ns+nInnerSector){
1703          gMC->
1704           Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1705         }
1706       }
1707     } // lower sectors finished
1708
1709     xc = rOuter*TMath::Cos(phi3*kDegrad);
1710     yc = rOuter*TMath::Sin(phi3*kDegrad);
1711
1712     gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1713
1714     // here upper sectors
1715
1716     if(fSecAU <0){
1717
1718       // all upper sectors
1719
1720       gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1721       gMC->
1722         Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1723     }
1724     else{
1725
1726       // only selected sectors (up to 12)
1727
1728       for(Int_t sel=0;sel<12;sel++){
1729         if(fSecUps[sel] == ns+2*nInnerSector){
1730           gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1731         }
1732         else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1733          gMC->
1734           Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1735         }
1736       }
1737     } // upper sectors finished
1738
1739     nRotMat++;
1740
1741     theta2 = 0.; // reflection, needed for readout chambers!
1742
1743     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1744
1745     xc = rInner*TMath::Cos(phi3*kDegrad);
1746     yc = rInner*TMath::Sin(phi3*kDegrad);
1747
1748     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1749
1750     xc = rOuter*TMath::Cos(phi3*kDegrad);
1751     yc = rOuter*TMath::Sin(phi3*kDegrad);
1752
1753     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1754
1755     nRotMat++;
1756
1757
1758   }
1759
1760   // reflection matrix
1761
1762   theta1 = 90.;
1763   phi1   = 0.;
1764   theta2 = 90.;
1765   phi2   = 270.;
1766   theta3 = 180.;
1767   phi3   = 0.;
1768
1769   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1770
1771
1772   // TPMW->TPC
1773
1774   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1775   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1776   gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1777   gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1778
1779
1780
1781   //-------------------------------------------------------
1782   // Tpc High Voltage Membrane - NOMEX honeycomb
1783   //-------------------------------------------------------
1784
1785   dm[0]=0.,
1786   dm[1]=360.;
1787   dm[2]=18.;
1788   dm[3]=2.;
1789
1790   //
1791
1792   dm[4]= -0.3;
1793   dm[5]= 81.156;
1794   dm[6]= 253.386;
1795
1796   //
1797
1798   dm[7]= 0.3;
1799   dm[8]= dm[5];
1800   dm[9]= dm[6];
1801
1802   gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1803
1804   gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1805
1806   //----------------------------------------------------------
1807   // TPc Support Rods - MAKROLON
1808   //----------------------------------------------------------
1809
1810   dm[0]= 0.9;
1811   dm[1]= 1.2;
1812   dm[2]= 126.65;
1813
1814   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1815
1816   for(Int_t nrod=1;nrod<18;nrod++){
1817     Float_t angle=innerOpenAngle*(Float_t)nrod;
1818
1819     xc=82.4*TMath::Cos(angle);
1820     yc=82.4*TMath::Sin(angle);
1821
1822     gMC->Gspos("TPSR",nrod,"TDGN",xc,yc,126.95,0,"ONLY");
1823     gMC->Gspos("TPSR",nrod+17,"TDGN",xc,yc,-126.95,0,"ONLY");
1824
1825     xc=254.2*TMath::Cos(angle);
1826     yc=254.2*TMath::Sin(angle);
1827
1828     gMC->Gspos("TPSR",nrod+34,"TDGN",xc,yc,126.95,0,"ONLY");
1829     gMC->Gspos("TPSR",nrod+51,"TDGN",xc,yc,-126.95,0,"ONLY");
1830
1831   }
1832
1833   //----------------------------------------------------------
1834   // Tpc High Voltage rod - MAKROLON + Copper cable
1835   //----------------------------------------------------------
1836
1837   // rod with cable (Left)
1838
1839   dm[0]=0.;
1840   dm[1]=2.25;
1841   dm[2]=126.65;
1842
1843   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1844
1845   // HV cable
1846
1847   dm[0]=0.;
1848   dm[1]=0.3;
1849   dm[2]=126.65;
1850
1851   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1852
1853   // empty space
1854
1855   dm[0]=0.3;
1856   dm[1]=1.;
1857   dm[2]=126.65;
1858
1859   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1860
1861   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1862   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1863
1864   // rod without cable
1865
1866   dm[0]=1.8;
1867   dm[1]=2.25;
1868   dm[2]=126.65;
1869
1870   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1871
1872
1873
1874   gMC->Gspos("THVL",1,"TDGN",82.4,0.,-126.95,0,"ONLY");
1875   gMC->Gspos("THVL",2,"TDGN",254.2,0.,-126.95,0,"ONLY");
1876
1877   gMC->Gspos("THVR",1,"TDGN",82.4,0.,126.95,0,"ONLY");
1878   gMC->Gspos("THVR",2,"TDGN",254.2,0.,126.95,0,"ONLY");
1879
1880
1881
1882   gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1883
1884   // services wheel cover -> wheel
1885
1886
1887   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1888   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1889
1890
1891   // put the wheel into the TPC
1892
1893   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1894   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1895
1896   gMC->Gsord("TPMW",6);
1897   if(fSecAL >=0)  gMC->Gsord("TPLS",3);
1898   if(fSecAU >=0 && fSens >0)  gMC->Gsord("TPUS",3);
1899   gMC->Gsord("TDGN",6);
1900   gMC->Gsord("TSSW",6);
1901   gMC->Gsord("TSWC",6);
1902
1903   // put the TPC into ALIC (main mother volume)
1904
1905   gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
1906
1907 } // end of function
1908
1909 //_____________________________________________________________________________
1910 void AliTPCv2::DrawDetector()
1911 {
1912   //
1913   // Draw a shaded view of the Time Projection Chamber version 1
1914   //
1915
1916   // Set everything unseen
1917   gMC->Gsatt("*", "seen", -1);
1918   //
1919   // Set ALIC mother transparent
1920   gMC->Gsatt("ALIC","SEEN",0);
1921   //
1922   // Set the volumes visible
1923   //
1924
1925   gMC->Gsatt("TPC ","SEEN",0);
1926   gMC->Gsatt("TOIN","SEEN",1);
1927   gMC->Gsatt("TOIN","COLO",7);
1928   gMC->Gsatt("TPCR","SEEN",0);
1929   gMC->Gsatt("TOCV","SEEN",1);
1930   gMC->Gsatt("TOCV","COLO",4);
1931   gMC->Gsatt("TSA1","SEEN",0);
1932   gMC->Gsatt("TSA2","SEEN",0);
1933   gMC->Gsatt("TSA3","SEEN",0);
1934   gMC->Gsatt("TSA4","SEEN",0);
1935   gMC->Gsatt("TOFC","SEEN",1);
1936   gMC->Gsatt("TOFC","COLO",4);
1937   gMC->Gsatt("TSA5","SEEN",0);
1938   gMC->Gsatt("TSA6","SEEN",0);
1939   gMC->Gsatt("TSA7","SEEN",0);
1940   gMC->Gsatt("TIIN","COLO",7);
1941   gMC->Gsatt("TIIN","SEEN",1);
1942   gMC->Gsatt("TICL","SEEN",0);
1943   gMC->Gsatt("TSA9","SEEN",0);
1944   gMC->Gsatt("TS10","SEEN",0);
1945   gMC->Gsatt("TS11","SEEN",0);
1946   gMC->Gsatt("TS12","SEEN",0);
1947   gMC->Gsatt("TICR","SEEN",0);
1948   gMC->Gsatt("TS13","SEEN",0);
1949   gMC->Gsatt("TS14","SEEN",0);
1950   gMC->Gsatt("TS15","SEEN",0);
1951   gMC->Gsatt("TS16","SEEN",0);
1952   gMC->Gsatt("TIFC","SEEN",1);
1953   gMC->Gsatt("TIFC","COLO",4);
1954   gMC->Gsatt("TS17","SEEN",0);
1955   gMC->Gsatt("TS18","SEEN",0);
1956   gMC->Gsatt("TS19","SEEN",0);
1957   gMC->Gsatt("TS21","SEEN",0);
1958   gMC->Gsatt("TS22","SEEN",0);
1959   gMC->Gsatt("TS23","SEEN",0);
1960   gMC->Gsatt("TS24","SEEN",0);
1961   gMC->Gsatt("TDGN","SEEN",0);
1962   gMC->Gsatt("TIRC","SEEN",0);
1963   gMC->Gsatt("TIC1","SEEN",1);
1964   gMC->Gsatt("TIPP","SEEN",0);
1965   gMC->Gsatt("TIC3","SEEN",0);
1966   gMC->Gsatt("TRCE","SEEN",0);
1967   gMC->Gsatt("TPSC","SEEN",0);
1968   gMC->Gsatt("TPCC","SEEN",0);
1969   gMC->Gsatt("TORC","SEEN",0);
1970   gMC->Gsatt("TOPP","SEEN",0);
1971   gMC->Gsatt("TOC3","SEEN",0);
1972   gMC->Gsatt("TOC1","SEEN",1);
1973   gMC->Gsatt("TSSW","SEEN",1);
1974   gMC->Gsatt("TSWC","SEEN",1);
1975   gMC->Gsatt("TSCE","SEEN",1);
1976   gMC->Gsatt("TSSW","COLO",3);
1977   gMC->Gsatt("TSWC","COLO",3);
1978   gMC->Gsatt("TSCE","COLO",6);
1979   gMC->Gsatt("TWES","SEEN",0);
1980   gMC->Gsatt("TSWB","SEEN",0);
1981   gMC->Gsatt("TPEL","SEEN",0);
1982   gMC->Gsatt("TPMW","SEEN",1);
1983   gMC->Gsatt("TPEW","SEEN",1);
1984   gMC->Gsatt("TESR","SEEN",1);
1985   gMC->Gsatt("TPMW","COLO",12);
1986   gMC->Gsatt("TPEW","COLO",12);
1987   gMC->Gsatt("TWES","COLO",5);
1988   gMC->Gsatt("TIC1","COLO",5);
1989   gMC->Gsatt("TOC1","COLO",5);
1990   gMC->Gsatt("TESB","SEEN",0);
1991   gMC->Gsatt("TPLS","SEEN",0);
1992   gMC->Gsatt("TPUS","SEEN",0);
1993   gMC->Gsatt("TPSS","SEEN",0);
1994   gMC->Gsatt("THVM","SEEN",1);
1995   gMC->Gsatt("THVM","COLO",11);
1996   gMC->Gsatt("TPSR","SEEN",0);
1997   gMC->Gsatt("THVL","SEEN",0);
1998   gMC->Gsatt("THVC","SEEN",0);
1999   gMC->Gsatt("THVE","SEEN",0);
2000   gMC->Gsatt("THVR","SEEN",0);
2001
2002   //
2003   gMC->Gdopt("hide", "on");
2004   gMC->Gdopt("shad", "on");
2005   gMC->Gsatt("*", "fill", 7);
2006   gMC->SetClipBox(".");
2007   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
2008   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
2009   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
2010   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
2011   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
2012   gMC->DefaultRange();
2013   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
2014   gMC->Gdhead(1111, "Time Projection Chamber");
2015   gMC->Gdman(18, 4, "MAN");
2016   gMC->Gdopt("hide","off");
2017 }
2018
2019 //_____________________________________________________________________________
2020 void AliTPCv2::CreateMaterials()
2021 {
2022   //
2023   // Define materials for version 2 of the Time Projection Chamber
2024   //
2025
2026   AliTPC::CreateMaterials();
2027 }
2028
2029 //_____________________________________________________________________________
2030 void AliTPCv2::Init()
2031 {
2032   //
2033   // Initialises version 2 of the TPC after that it has been built
2034   //
2035
2036   Int_t *idtmed = fIdtmed->GetArray();
2037
2038   AliTPC::Init();
2039
2040
2041
2042   fIdSens=gMC->VolId("TPSS");
2043
2044   fIdLSec=gMC->VolId("TPLS"); // lower sector
2045   fIdUSec=gMC->VolId("TPUS"); // upper sector
2046
2047   gMC->SetMaxNStep(30000); // max. number of steps increased
2048
2049   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
2050
2051   printf("*** TPC version 2 initialized ***\n");
2052   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
2053
2054   //
2055
2056 }
2057
2058 //_____________________________________________________________________________
2059 void AliTPCv2::StepManager()
2060 {
2061   //
2062   // Called for every step in the Time Projection Chamber
2063   //
2064
2065   //
2066   // parameters used for the energy loss calculations
2067   //
2068   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
2069   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
2070   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
2071
2072
2073   const Float_t kbig = 1.e10;
2074
2075   Int_t id,copy;
2076   Float_t hits[4];
2077   Int_t vol[2];
2078   TLorentzVector p;
2079
2080   vol[1]=0; // preset row number to 0
2081
2082   //
2083
2084   gMC->SetMaxStep(kbig);
2085
2086   if(!gMC->IsTrackAlive()) return; // particle has disappeared
2087
2088   Float_t charge = gMC->TrackCharge();
2089
2090   if(TMath::Abs(charge)<=0.) return; // take only charged particles
2091
2092   // check the sensitive volume
2093
2094   id = gMC->CurrentVolID(copy); // current volume Id
2095
2096   if(id == fIdLSec){
2097     vol[0] = copy-1; // lower sector number
2098   }
2099   else if(id == fIdUSec){
2100     vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2101   }
2102   else if(id == fIdSens && gMC->IsTrackEntering()){
2103
2104     // track is entering the sensitive strip
2105
2106     vol[1]= copy-1; // row number (absolute)
2107
2108     // sector type
2109
2110     id = gMC->CurrentVolOffID(1,copy);
2111
2112     if(id == fIdLSec){
2113
2114       // lower sector
2115
2116       vol[0] = copy-1; // sector number
2117
2118     }
2119     else {
2120
2121       // upper sector
2122
2123       vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2124       vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
2125
2126     }
2127
2128     if(vol[1] == 0){
2129
2130       // because Jouri wants to have this
2131
2132       gMC->TrackMomentum(p);
2133       hits[0]=p[0];
2134       hits[1]=p[1];
2135       hits[2]=p[2];
2136       hits[3]=0.; // this hit has no energy loss
2137       // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2138
2139       AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2140
2141     }
2142
2143      gMC->TrackPosition(p);
2144      hits[0]=p[0];
2145      hits[1]=p[1];
2146      hits[2]=p[2];
2147      hits[3]=0.; // this hit has no energy loss
2148      // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2149
2150      AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2151
2152   }
2153   else return;
2154
2155   //-----------------------------------------------------------------
2156   //  charged particle is in the sensitive volume
2157   //-----------------------------------------------------------------
2158
2159   if(gMC->TrackStep() > 0) {
2160
2161     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2162     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2163
2164     gMC->TrackPosition(p);
2165     hits[0]=p[0];
2166     hits[1]=p[1];
2167     hits[2]=p[2];
2168     hits[3]=(Float_t)nel;
2169
2170     // Add this hit
2171
2172     // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2173     if (fHitType&&2){
2174       gMC->TrackMomentum(p);
2175       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2176       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
2177       fTrackHits->SetHitPrecision(precision);
2178     }
2179     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2180
2181   }
2182
2183   // Stemax calculation for the next step
2184
2185   Float_t pp;
2186   TLorentzVector mom;
2187   gMC->TrackMomentum(mom);
2188   Float_t ptot=mom.Rho();
2189   Float_t betaGamma = ptot/gMC->TrackMass();
2190
2191   Int_t pid=gMC->TrackPid();
2192   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2193     {
2194       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2195     }
2196   else
2197     {
2198
2199       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
2200       pp=kprim*BetheBloch(betaGamma);
2201
2202       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2203     }
2204
2205   Float_t random[1];
2206   gMC->Rndm(random,1); // good, old GRNDM from Geant3
2207
2208   Double_t rnd = (Double_t)random[0];
2209
2210   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2211
2212 }
2213
2214 //_____________________________________________________________________________
2215 Float_t AliTPCv2::BetheBloch(Float_t bg)
2216 {
2217   //
2218   // Bethe-Bloch energy loss formula
2219   //
2220   const Double_t kp1=0.76176e-1;
2221   const Double_t kp2=10.632;
2222   const Double_t kp3=0.13279e-4;
2223   const Double_t kp4=1.8631;
2224   const Double_t kp5=1.9479;
2225
2226   Double_t dbg = (Double_t) bg;
2227
2228   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2229
2230   Double_t aa = TMath::Power(beta,kp4);
2231   Double_t bb = TMath::Power(1./dbg,kp5);
2232
2233   bb=TMath::Log(kp3+bb);
2234
2235   return ((Float_t)((kp2-aa-bb)*kp1/aa));
2236 }
2237
2238