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