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