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