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