TPC/AliTPCv3.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 1.31  2002/11/21 22:43:33  alibrary
  19 Removing AliMC and AliMCProcess
  20
  21 Revision 1.30  2002/10/14 14:57:43  hristov
  22 Merging the VirtualMC branch to the main development branch (HEAD)
  23
  24 Revision 1.29.6.2  2002/07/24 10:09:01  alibrary
  25 Updating VirtualMC
  26
  27 Revision 1.29  2002/01/21 17:12:00  kowal2
  28 New track hits structure using root containers
  29
  30 Revision 1.28  2001/06/12 07:07:41  kowal2
  31 New files for folder and stack
  32
  33 Revision 1.27  2001/05/08 16:03:06  kowal2
  34 Geometry update according to the latest technical spec.
  35
  36 Revision 1.26  2001/04/27 15:23:07  kowal2
  37 Correct materian in the central part of the inner containment vessel
  38
  39 Revision 1.25  2001/04/26 06:15:12  kowal2
  40 Corrected bug in the inner containment vessel (cones)
  41
  42 Revision 1.24  2001/04/24 11:22:01  kowal2
  43 Protection against too small betagamma
  44
  45 Revision 1.23  2001/04/24 11:17:33  kowal2
  46 New TPC geometry.
  47
  48 Revision 1.22  2001/03/13 13:07:34  kowal2
  49 Corrected bug in the TPC mother volume geometry.
  50 Thanks to A. Morsch
  51
  52 Revision 1.21  2000/11/30 11:48:50  kowal2
  53 TLorentzVector.h adde to satisfy the latest changes by Federico
  54
  55 Revision 1.20  2000/11/14 10:48:57  kowal2
  56 Correct material used for TSA4. Thanks to J. Barbosa.
  57
  58 Revision 1.19  2000/11/06 17:24:10  kowal2
  59 Corrected bug in the outer containment vessel and
  60 the outer field cage geometry.
  61 Thanks to J. Barbosa.
  62
  63 Revision 1.18  2000/11/02 16:55:24  kowal2
  64 Corrected bug in the inner containment vessel geometry.
  65 Thanks to J. Belikov
  66
  67 Revision 1.17  2000/11/02 07:24:11  kowal2
  68 Correction in the TPC geometry.
  69 Changes due to the new hit structure.
  70
  71 Revision 1.16  2000/10/02 21:28:18  fca
  72 Removal of useless dependecies via forward declarations
  73
  74 Revision 1.15  2000/07/10 20:57:39  hristov
  75 Update of TPC code and macros by M.Kowalski
  76
  77 Revision 1.14  2000/06/30 12:07:50  kowal2
  78 Updated from the TPC-PreRelease branch
  79
  80 Revision 1.13.2.4  2000/06/26 07:39:42  kowal2
  81 Changes to obey the coding rules
  82
  83 Revision 1.13.2.3  2000/06/25 08:38:41  kowal2
  84 Splitted from AliTPCtracking
  85
  86 Revision 1.13.2.2  2000/06/16 12:58:13  kowal2
  87 Changed parameter settings
  88
  89 Revision 1.13.2.1  2000/06/09 07:15:07  kowal2
  90
  91 Defaults loaded automatically (hard-wired)
  92 Optional parameters can be set via macro called in the constructor
  93
  94 Revision 1.13  2000/05/15 10:00:30  kowal2
  95 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
  96
  97 Revision 1.12  2000/04/17 09:37:33  kowal2
  98 removed obsolete AliTPCDigitsDisplay.C
  99
 100 Revision 1.11.8.2  2000/04/10 08:36:12  kowal2
 101
 102 Updated readout chambers
 103 Some modifications to StepManager by M. Kowalski
 104
 105 Revision 1.11.8.1  2000/04/10 07:56:53  kowal2
 106 Not used anymore - removed
 107
 108 Revision 1.11  1999/11/04 17:28:07  fca
 109 Correct barrel part of HV Degrader
 110
 111 Revision 1.10  1999/10/14 16:52:08  fca
 112 Only use PDG codes and not GEANT ones
 113
 114 Revision 1.9  1999/10/08 06:27:23  fca
 115 Corrected bug in the HV degrader geometry, thanks to G.Tabary
 116
 117 Revision 1.8  1999/10/04 13:39:55  fca
 118 Correct array index problem
 119
 120 Revision 1.7  1999/09/29 09:24:34  fca
 121 Introduction of the Copyright and cvs Log
 122
 123 */
 124
 125 //
 126 ///////////////////////////////////////////////////////////////////////////////
 127 //                                                                           //
 128 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
 129 //
 130 //Begin_Html
 131 /*
 132 <img src="picts/AliTPCv3Class.gif">
 133 */
 134 //End_Html
 135 //                                                                           //
 136 //                                                                           //
 137 ///////////////////////////////////////////////////////////////////////////////
 138
 139 #include <stdlib.h>
 140
 141 #include <TLorentzVector.h>
 142 #include <TPDGCode.h>
 143 #include <TInterpreter.h>
 144 #include <TMath.h>
 145
 146 #include "AliConst.h"
 147 #include "AliRun.h"
 148 #include "AliTPCDigitsArray.h"
 149 #include "AliTPCParam.h"
 150 #include "AliTPCParamSR.h"
 151 #include "AliTPCTrackHitsV2.h"
 152 #include "AliTPCv3.h"
 153
 154 ClassImp(AliTPCv3)
 155 //_____________________________________________________________________________
 156
 157   AliTPCv3::AliTPCv3(){
 158
 159   fHitType = 1;
 160
 161 }
 162
 163 //_____________________________________________________________________________
 164 AliTPCv3::AliTPCv3(const char *name, const char *title) :
 165   AliTPC(name, title)
 166 {
 167   //
 168   // Standard constructor for Time Projection Chamber version 3
 169   //
 170
 171   SetBufferSize(128000);
 172   fIdSens=0;
 173
 174   SetGasMixt(2,20,10,-1,0.9,0.1,0.);
 175
 176   if (fTPCParam)
 177      fTPCParam->Write(fTPCParam->GetTitle());
 178
 179   fHitType =1;
 180 }
 181
 182 //_____________________________________________________________________________
 183 void AliTPCv3::CreateGeometry()
 184 {
 185   //
 186   // Creation of the TPC coarse geometry (version 3)
 187   // The whole drift volume is sensitive
 188   // Origin Marek Kowalski Cracow
 189   //
 190   //Begin_Html
 191   /*
 192     <img src="picts/AliTPCgif">
 193   */
 194   //End_Html
 195   //Begin_Html
 196   /*
 197     <img src="picts/AliTPCv3Tree.gif">
 198   */
 199   //End_Html
 200   Float_t dm[50];
 201
 202   Int_t *idtmed = fIdtmed->GetArray(); // TPC media
 203
 204   Int_t idrotm[120]; // rotation matrices
 205
 206   Int_t nRotMat = 0; // actual number of rotation matrices
 207
 208
 209   //
 210   //  Mother volume (Air) - all volumes will be positioned in it
 211   //
 212
 213   dm[0]=0.;
 214   dm[1]=360.;
 215   dm[2]=8.;
 216
 217   //
 218
 219   dm[3]=-283.7;
 220   dm[4]=65.6;
 221   dm[5]=278.;
 222
 223   //
 224
 225   dm[6]=-253.6;
 226   dm[7]=65.6;
 227   dm[8]=278.;
 228
 229   //
 230
 231   dm[9]=-73.3;
 232   dm[10]=60.9;
 233   dm[11]=278.;
 234
 235   //
 236
 237   dm[12]=-73.3;
 238   dm[13]=56.9;
 239   dm[14]=278.;
 240
 241   //
 242
 243   dm[15]=73.3;
 244   dm[16]=56.9;
 245   dm[17]=278.;
 246
 247   //
 248
 249   dm[18]=73.3;
 250   dm[19]=60.9;
 251   dm[20]=278.;
 252
 253   //
 254
 255   dm[21]=253.6;
 256   dm[22]=65.6;
 257   dm[23]=278.;
 258
 259   //
 260
 261   dm[24]=283.7;
 262   dm[25]=65.6;
 263   dm[26]=278.;
 264
 265   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
 266
 267   // outer part
 268
 269   //-------------------------------------------------------------------
 270   //   Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
 271   //-------------------------------------------------------------------
 272
 273   dm[0]= 0.;
 274   dm[1]= 360.;
 275   dm[2]= 6.;
 276
 277   //
 278
 279   dm[3]=-253.6;
 280   dm[4]=258.;
 281   dm[5]=275.5;
 282
 283   //
 284
 285   dm[6]=-250.6;
 286   dm[7]=258.;
 287   dm[8]=275.5;
 288
 289   //
 290
 291   dm[9]=-250.6;
 292   dm[10]=258.;
 293   dm[11]=278.;
 294
 295   //
 296
 297   dm[12]=253.6;
 298   dm[13]=258.;
 299   dm[14]=278.;
 300
 301   //
 302
 303   dm[15]=253.6;
 304   dm[16]=264.8;
 305   dm[17]=278.;
 306
 307   //
 308
 309   dm[18]=256.6;
 310   dm[19]=264.8;
 311   dm[20]=278.;
 312
 313   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 314
 315   //----------------------------------------------------------------
 316   // Tpc Outer Contaiment Vessel
 317   //  mother volume - Al, daughters - composite (sandwich)
 318   //----------------------------------------------------------------
 319
 320   dm[0]=0.;
 321   dm[1]=360.;
 322   dm[2]=6.;
 323
 324   //
 325
 326   dm[3]=-250.6;
 327   dm[4]=270.4;
 328   dm[5]=278.;
 329
 330   //
 331
 332   dm[6]=-247.6;
 333   dm[7]=270.4;
 334   dm[8]=278.;
 335
 336   //
 337
 338   dm[9]=-247.6;
 339   dm[10]=274.8124;
 340   dm[11]=278.;
 341
 342   //
 343
 344   dm[12]=253.6;
 345   dm[13]=274.8124;
 346   dm[14]=278.;
 347
 348   //
 349
 350   dm[15]=253.6;
 351   dm[16]=264.8;
 352   dm[17]=278.;
 353
 354   //
 355
 356   dm[18]=256.6;
 357   dm[19]=264.8;
 358   dm[20]=278.;
 359
 360   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 361
 362   // Daughter volumes - sandwich
 363
 364   // Tpc SAndwich 1 - Al
 365
 366   dm[0]=274.8124;
 367   dm[1]=278.;
 368   dm[2]=252.1;
 369
 370   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 371
 372   // Tpc SAndwich 2 - epoxy glue (I use Lexan)
 373
 374   dm[0] += 5.e-3;
 375   dm[1] -= 5.e-3;
 376
 377   gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
 378
 379   // Tpc SAndwich 3 - Tedlar
 380
 381   dm[0] += 0.01;
 382   dm[1] -= 0.01;
 383
 384   gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
 385
 386
 387   // Tpc SAndwich 4 - fiber glass (G10)
 388
 389   dm[0] += 3.8e-3;
 390   dm[1] -= 3.8e-3;
 391
 392   gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
 393
 394   // Tpc SAndwich 5 - NOMEX honeycomb
 395
 396   dm[0] += 0.075;
 397   dm[1] -= 0.075;
 398
 399   gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
 400
 401   // 5->4->3->2->1->TCOV
 402
 403
 404   gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
 405   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 406   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 407   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 408
 409   gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
 410
 411   // TCOV-> TOIN
 412
 413   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 414
 415   //-------------------------------------------------------
 416   //  Tpc Outer Field Cage
 417   //  mother volume - Al, daughters - composite (sandwich)
 418   //-------------------------------------------------------
 419
 420   dm[0]=0.;
 421   dm[1]=360.;
 422   dm[2]=6.;
 423
 424   //
 425
 426   dm[3]=-253.6;
 427   dm[4]=258.;
 428   dm[5]=275.5;
 429
 430   //
 431
 432   dm[6]=-250.6;
 433   dm[7]=258.;
 434   dm[8]=275.5;
 435
 436   //
 437
 438   dm[9]=-250.6;
 439   dm[10]=258.;
 440   dm[11]=260.0476;
 441
 442   //
 443
 444   dm[12]=250.6;
 445   dm[13]=258.;
 446   dm[14]=260.0476;
 447
 448   //
 449
 450   dm[15]=250.6;
 451   dm[16]=258.;
 452   dm[17]=275.5;
 453
 454   //
 455
 456   dm[18]=253.6;
 457   dm[19]=258.;
 458   dm[20]=275.5;
 459
 460   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 461
 462   // Daughter volumes
 463
 464   // Tpc SAndwich 6 - Tedlar
 465
 466   dm[0]= 258.;
 467   dm[1]= 260.0476;
 468   dm[2]= 252.1;
 469
 470   gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
 471
 472   // Tpc SAndwich 7 - fiber glass
 473
 474   dm[0] += 3.8e-3;
 475   dm[1] -= 3.8e-3;
 476
 477   gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
 478
 479
 480   // Tpc SAndwich 8 - NOMEX
 481
 482   dm[0] += 0.02;
 483   dm[1] -= 0.02;
 484
 485   gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
 486
 487   // 8->7->6->TOFC
 488
 489   gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
 490   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 491   gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
 492
 493   // TOFC->TOIN
 494
 495   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 496
 497   // TOIN->TPC
 498
 499   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 500
 501   // inner part
 502
 503   //--------------------------------------------------------------------
 504   // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
 505   // Inner containment vessel will be placed directly in the TPC
 506   //--------------------------------------------------------------------
 507
 508   dm[0]=0.;
 509   dm[1]=360.;
 510   dm[2]=4.;
 511
 512   //
 513
 514   dm[3]=-253.6;
 515   dm[4]=65.9;
 516   dm[5]=79.2;
 517
 518   //
 519
 520   dm[6]=-73.3;
 521   dm[7]=61.2;
 522   dm[8]=79.2;
 523
 524   //
 525
 526   dm[9]=73.3;
 527   dm[10]=61.2;
 528   dm[11]=79.2;
 529
 530   //
 531
 532   dm[12]=253.6;
 533   dm[13]=65.9;
 534   dm[14]=79.2;
 535
 536   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
 537
 538   // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
 539
 540   dm[0]=79.16;
 541   dm[1]=79.2;
 542   dm[2]=88.;
 543
 544   gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
 545
 546   gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
 547
 548   //-----------------------------------------------------
 549   // Tpc Inner Field Cage
 550   // mother volume - Al, daughters - composite (sandwich)
 551   //------------------------------------------------------
 552
 553   dm[0]=0.;
 554   dm[1]=360.;
 555   dm[2]=10.;
 556
 557   //
 558
 559   dm[3]=-253.6;
 560   dm[4]=70.3;
 561   dm[5]=79.2;
 562
 563   //
 564
 565   dm[6]=-250.6;
 566   dm[7]=70.3;
 567   dm[8]=79.2;
 568
 569   //
 570
 571   dm[9]=-250.6;
 572   dm[10]=77.0524;
 573   dm[11]=79.2;
 574
 575   //
 576
 577   dm[12]=-88.;
 578   dm[13]=77.0524;
 579   dm[14]=79.2;
 580
 581   //
 582
 583   dm[15]=-88.;
 584   dm[16]=77.0924;
 585   dm[17]=79.16;
 586
 587   //
 588
 589   dm[18]=88.;
 590   dm[19]=77.0924;
 591   dm[20]=79.16;
 592
 593   //
 594
 595   dm[21]=88.;
 596   dm[22]=77.0524;
 597   dm[23]=79.2;
 598
 599   //
 600
 601   dm[24]=250.6;
 602   dm[25]=77.0524;
 603   dm[26]=79.2;
 604
 605   //
 606
 607   dm[27]=250.6;
 608   dm[28]=70.3;
 609   dm[29]=79.2;
 610
 611   //
 612
 613   dm[30]=253.6;
 614   dm[31]=70.3;
 615   dm[32]=79.2;
 616
 617   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
 618
 619   // daughter volumes - central part
 620
 621   // Tpc Sandwich 9 -Tedlar
 622
 623   dm[0]=77.0924;
 624   dm[1]=79.16;
 625   dm[2]=88.;
 626
 627   gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
 628
 629   // Tpc Sandwich 10 - fiber glass (G10)
 630
 631   dm[0] += 3.8e-3;
 632   dm[1] -= 3.8e-3;
 633
 634   gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
 635
 636   // Tpc Sandwich 11 - NOMEX
 637
 638   dm[0] += 0.03;
 639   dm[1] -= 0.03;
 640
 641   gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
 642
 643   // 11->10->9->TIFC
 644
 645   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 646   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 647
 648   gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
 649
 650   // daughter volumes - outer parts (reinforced)
 651
 652   // Tpc Sandwich 12 -Tedlar
 653
 654   dm[0]=77.0524;
 655   dm[1]=79.2;
 656   dm[2]=82.05;
 657
 658   gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
 659
 660   // Tpc Sandwich 13 - fiber glass (G10)
 661
 662   dm[0] += 3.8e-3;
 663   dm[1] -= 3.8e-3;
 664
 665   gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
 666
 667   // Tpc Sandwich 14 - NOMEX
 668
 669   dm[0] += 0.07;
 670   dm[1] -= 0.07;
 671
 672   gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
 673
 674   // 14->13->12->TIFC
 675
 676   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 677   gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
 678
 679   gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
 680   gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
 681
 682   // place this inside the inner insulator
 683
 684   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
 685
 686   // and now in the TPC...
 687
 688   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 689
 690   //---------------------------------------------------------
 691   // Tpc Inner Containment vessel - Cones
 692   //---------------------------------------------------------
 693
 694   dm[0]=0.;
 695   dm[1]=360.;
 696   dm[2]=8.;
 697
 698   //
 699
 700   dm[3]=71.8;
 701   dm[4]=56.9;
 702   dm[5]=59.4;
 703
 704   //
 705
 706   dm[6]=73.;
 707   dm[7]=56.9;
 708   dm[8]=59.4;
 709
 710   //
 711
 712   dm[9]=73.;
 713   dm[10]=56.9;
 714   dm[11]=61.2;
 715
 716   //
 717
 718   dm[12]=73.3;
 719   dm[13]=56.9;
 720   dm[14]=61.2;
 721
 722   //
 723
 724   dm[15]=73.3;
 725   dm[16]=60.9;
 726   dm[17]=61.2;
 727
 728   //
 729
 730   dm[18]=253.6;
 731   dm[19]=65.6;
 732   dm[20]=65.9;
 733
 734   //
 735
 736   dm[21]=253.6;
 737   dm[22]=65.6;
 738   dm[23]=74.6;
 739
 740   //
 741
 742   dm[24]=256.6;
 743   dm[25]=65.6;
 744   dm[26]=74.6;
 745
 746   gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
 747
 748   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
 749
 750   // reflection matrix
 751
 752   theta1 = 90.;
 753   phi1   = 0.;
 754   theta2 = 90.;
 755   phi2   = 270.;
 756   theta3 = 180.;
 757   phi3   = 0.;
 758
 759   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 760
 761   gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
 762   gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 763
 764
 765   //---------------------------------------------------------
 766   // Tpc Inner Containment vessel - Middle part -Al
 767   //---------------------------------------------------------
 768
 769   dm[0]=0.;
 770   dm[1]=360.;
 771   dm[2]=6.;
 772
 773   //
 774
 775   dm[3]=-71.6;
 776   dm[4]=60.2;
 777   dm[5]=61.2;
 778
 779   //
 780
 781   dm[6]=-69.1;
 782   dm[7]=60.2;
 783   dm[8]=61.2;
 784
 785   //
 786
 787   dm[9]=-69.1;
 788   dm[10]=60.6224;
 789   dm[11]=61.2;
 790
 791   //
 792
 793   dm[12]=69.1;
 794   dm[13]=60.6224;
 795   dm[14]=61.2;
 796
 797   //
 798
 799   dm[15]=69.1;
 800   dm[16]=60.2;
 801   dm[17]=61.2;
 802
 803   //
 804
 805   dm[18]=71.6;
 806   dm[19]=60.2;
 807   dm[20]=61.2;
 808
 809   gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
 810
 811   // Tpc Sandwich 15 - Al
 812
 813   dm[0]=60.6224;
 814   dm[1]=61.2;
 815   dm[2]=70.1;
 816
 817   gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
 818
 819   // Tpc Sandwich 16 -  epoxy glue
 820
 821   dm[0] += 5.e-3;
 822   dm[1] -= 5.e-3;
 823
 824   gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
 825
 826   // Tpc Sandwich 17 - Tedlar
 827
 828   dm[0] += 0.01;
 829   dm[1] -= 0.01;
 830
 831   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 832
 833   // Tpc Sandwich 18 - carbon fiber
 834
 835   dm[0] += 3.8e-3;
 836   dm[1] -= 3.8e-3;
 837
 838   gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
 839
 840   // Tpc Sandwich 19 - Nomex
 841
 842   dm[0] += 0.02;
 843   dm[1] -= 0.02;
 844
 845   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
 846
 847   // 19->18->17->16->15-> TICM
 848
 849   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
 850   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
 851   gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
 852   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 853
 854   gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
 855
 856
 857   // TPc inner cont. vessel Joints
 858
 859   dm[0]=60.2;
 860   dm[1]=61.2;
 861   dm[2]=0.5;
 862
 863   gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
 864
 865   gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
 866   gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
 867
 868   //
 869
 870   dm[0]=0.;
 871   dm[1]=360.;
 872   dm[2]=4.;
 873
 874   //
 875
 876   dm[3]=70.8;
 877   dm[4]=58.4;
 878   dm[5]=60.1;
 879
 880   //
 881
 882   dm[6]=71.2;
 883   dm[7]=58.4;
 884   dm[8]=60.1;
 885
 886   //
 887
 888   dm[9]=71.2;
 889   dm[10]=58.4;
 890   dm[11]=59.4;
 891
 892   //
 893
 894   dm[12]=71.6;
 895   dm[13]=58.4;
 896   dm[14]=59.4;
 897
 898   gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
 899
 900   gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
 901   gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 902
 903
 904
 905   // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
 906
 907   dm[0]=58.4;
 908   dm[1]=61.2;
 909   dm[2]=0.1;
 910
 911   gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
 912
 913   gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
 914   gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
 915
 916   // TICM -> TPC
 917
 918   gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
 919
 920   //
 921
 922   nRotMat++; // prepare for the next rotation matrix
 923
 924   //---------------------------------------------------------
 925   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
 926   //  and its daughters (HV membrane, rods, readout chambers)
 927   //---------------------------------------------------------
 928
 929   dm[0]= 79.2;
 930   dm[1]= 258.0;
 931   dm[2]= 253.6;
 932
 933   gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);
 934
 935   // sector opening angles
 936
 937   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
 938
 939   // sector angle shift
 940
 941   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
 942
 943   // number of sectors
 944
 945   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 946   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 947
 948   // All above parameters are identical for inner and outer
 949   // sectors. The distinction is kept for the historical reasons
 950   // and eventually will disappear.
 951
 952   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
 953   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
 954   Float_t space;
 955
 956   //-------------------------------------------------------------------------
 957   //   Tpc Inner Readout Chambers
 958   //-------------------------------------------------------------------------
 959
 960   dm[0]= 14.483;
 961   dm[1]= 23.3345;
 962   dm[2]= 1.6; // thickness
 963   dm[3]= 25.1;
 964
 965   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
 966
 967   // this volume will be positioned in the empty space
 968   // of the end-cap to avoid overlaps
 969
 970   dm[0]= 13.7305;
 971   dm[1]= 21.1895;
 972   dm[2]= 2.25;
 973   dm[3]= 21.15;
 974
 975   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
 976
 977
 978   //------------------------------------------------
 979   // Tpc Inner readout chamber Pad Plane
 980   //------------------------------------------------
 981
 982   dm[0]= 14.483;
 983   dm[1]= 23.3345;
 984   dm[2]= 0.5;
 985   dm[3]= 25.1;
 986
 987   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
 988
 989   //
 990
 991   dm[0] -= 1.218511934;
 992   dm[1] -= 1.218511934;
 993   dm[2] = 0.35;
 994
 995   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
 996
 997   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
 998
 999   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1000
1001
1002   //----------------------------------------------
1003   // Tpc Readout Chambers Empty spaces - for both
1004   // inner and outer sectors
1005   //----------------------------------------------
1006
1007   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1008
1009   // Inner sector - 4 spaces
1010
1011
1012   dm[3] = 4.7625;
1013   dm[0] = 12.472;
1014
1015   Float_t rr = 90.52;
1016   Float_t zz;
1017
1018   zz= -12.7875;
1019
1020   space = rr*tanAlpha-dm[0];
1021
1022   for(Int_t nsLow=0;nsLow<4;nsLow++){
1023
1024     rr += 9.525;
1025     dm[1]= rr*tanAlpha - space;
1026
1027     dm[2]=0.8;
1028
1029     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1030
1031     //
1032
1033     dm[2] = 1.2;
1034
1035     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1036
1037     rr += 0.4;
1038     dm[0] = rr*tanAlpha - space;
1039     zz += (0.4+9.525);
1040
1041   }
1042
1043   dm[0]= 12.472;
1044   // dm[1] - this is the dm[1] from the previous TRCE
1045   dm[2]= 1.05;
1046   dm[3]= 19.65;
1047
1048   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1049
1050   //
1051   // TPc Space for Connectors
1052   //
1053
1054   dm[0]= .3;
1055   dm[1]= .3;
1056   dm[2]= 4.5;
1057
1058   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1059
1060   // TPC Connectors
1061
1062   dm[0]= .25;
1063   dm[1]= .15;
1064   dm[2]= 3.75;
1065
1066   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1067
1068   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1069
1070   zz = -12.7875;
1071
1072
1073   Float_t alpha;
1074   Float_t astep;
1075
1076   // inner part of the inner sector - 2 x 20 holes
1077
1078   astep = 20.00096874/19.;
1079
1080   alpha = 10.00048437-astep;
1081
1082   Float_t x1,x2;
1083
1084     x1 = 13.31175725;
1085     x1 -= 0.996357832;
1086
1087     x2 = 15.06180253;
1088     x2 -= 1.163028812;
1089
1090   Int_t ncon;
1091
1092   for(ncon=0;ncon<20;ncon++){
1093
1094     phi1 = 0.;
1095     theta1 = 90.+alpha;
1096     phi2=90.;
1097     theta2 = 90.;
1098     phi3 = (alpha>0) ? 0. : 180.;
1099     theta3 = TMath::Abs(alpha);
1100
1101     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1102
1103
1104
1105     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1106     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1107
1108
1109     x1 -= 1.296357833;
1110     x2 -= 1.463028812;
1111
1112     alpha -= astep;
1113     nRotMat++;
1114
1115   }
1116
1117   // outer part of the inner sector - 2 x 25 holes
1118
1119    astep = 20.00096874/24.;
1120    alpha = 10.00048437-astep;
1121
1122    x1 = 16.81184781;
1123    x1 -= 1.016295986;
1124
1125    x2 = 18.5618931;
1126    x2 -= 1.150914854;
1127
1128   for(ncon=0;ncon<25;ncon++){
1129
1130     phi1 = 0.;
1131     theta1 = 90.+alpha;
1132     phi2=90.;
1133     theta2 = 90.;
1134     phi3 = (alpha>0) ? 0. : 180.;
1135     theta3 = TMath::Abs(alpha);
1136
1137     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1138
1139
1140
1141     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1142     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1143
1144
1145     x1 -= 1.316295986;
1146     x2 -= 1.450914854;
1147
1148     alpha -= astep;
1149     nRotMat++;
1150
1151   }
1152
1153   //--------------------------------------------------------------------------
1154   //  TPC Outer Readout Chambers
1155   //  this is NOT a final design
1156   //--------------------------------------------------------------------------
1157
1158   dm[0]= 23.3875;
1159   dm[1]= 43.524;
1160   dm[2]= 1.5; //thickness
1161   dm[3]= 57.1;
1162
1163   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1164
1165   //------------------------------------------------
1166   // Tpc Outer readout chamber Pad Plane
1167   //------------------------------------------------
1168
1169   dm[2]= 0.5;
1170
1171   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1172
1173   dm[0] -= 1.218511934;
1174   dm[1] -= 1.218511934;
1175   dm[2] = 0.35;
1176
1177   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1178
1179   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1180
1181   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1182
1183   // empty space
1184
1185   dm[0]= 21.035;
1186   dm[1]= 38.7205;
1187   dm[2]= 0.7;
1188   dm[3]= 50.15;
1189
1190   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1191
1192   dm[0]= 22.2935;
1193   dm[1]= 40.5085;
1194   dm[2]= 2.25;
1195   dm[3]= 51.65;
1196
1197   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1198
1199   dm[0]= 21.35;
1200   dm[1]= 38.7205;
1201   dm[2]= 2.25;
1202   dm[3]= 50.15;
1203
1204   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1205
1206   //-----------------------------------------------
1207   // Tpc Services Support Wheel
1208   //-----------------------------------------------
1209
1210   dm[0]=0.;
1211   dm[1]=360.;
1212   dm[2]=18.;
1213   dm[3]=2.;
1214
1215   dm[4]= -5.;
1216   dm[5]= 77.017;
1217   dm[6]= 255.267;
1218
1219   dm[7]= 5.;
1220   dm[8]= dm[5];
1221   dm[9]= dm[6];
1222
1223   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1224
1225   // Tpc Services Wheel Cover
1226
1227   dm[4]= -0.5;
1228   dm[7]= 0.5;
1229
1230   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1231
1232   // Tpc Service wheel Cover Empty space
1233
1234   dm[0]= 10.99;
1235   dm[1]= 39.599;
1236   dm[2]= .5;
1237   dm[3]= 81.125;
1238
1239   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1240
1241   // Tpc services Wheel Empty Spaces
1242
1243   dm[0]= 13.18017507;
1244   dm[1]= 44.61045938;
1245   dm[2]= 4.;
1246   dm[3]= 89.125;
1247
1248   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1249
1250   // Tpc Services Wheel Bars
1251
1252   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1253
1254   // bars-> TWES
1255
1256   dm[2]= 4.;
1257   dm[3]= .4;
1258
1259   dm[0]= 13.8149522;
1260   dm[1]= 13.95601379;
1261
1262   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1263
1264   dm[0]= 43.83462067;
1265   dm[1]= 43.97568225;
1266
1267   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1268
1269   // TPc ELectronics - right now 30% X0 Si
1270
1271   dm[0]= 14.03813696;
1272   dm[1]= 43.3524075;
1273   dm[2]= 1.404;
1274   dm[3]= 83.125;
1275
1276   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1277   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1278
1279   //--------------------------------------------------------------------------
1280   //  End caps
1281   //--------------------------------------------------------------------------
1282
1283   // TPc Main Wheel - Al
1284
1285   dm[0]= 74.9;
1286   dm[1]= 264.4;
1287   dm[2]= 3.0;
1288
1289   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1290
1291   //--------------------------------------------------------------------------
1292   //  Tpc Empty Space for the Readout chambers
1293   //--------------------------------------------------------------------------
1294
1295   Float_t rLow= 86.2;
1296   Float_t rUp= 243.5;
1297   Float_t dR = 0.5*(rUp-rLow);
1298
1299   space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1300
1301   dm[0]= rLow*tanAlpha-space;
1302   dm[1]= rUp*tanAlpha-space;
1303   dm[2] = 3.0;
1304   dm[3]= dR;
1305
1306   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1307
1308   // TIC1->TESR
1309
1310   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1311
1312   // TOC1->TESR
1313
1314   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1315
1316   // Tpc Empty Space Bars - Al (daughters of TESR)
1317
1318   Float_t zBar;
1319
1320   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1321
1322   // lower bar
1323
1324   dm[0]= rLow*tanAlpha-space;
1325   dm[1]= 88.7*tanAlpha-space;
1326   dm[2]= 2.25;
1327   dm[3]= 1.275;
1328
1329   zBar = -dR+dm[3];
1330
1331   gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1332
1333   // middle bar
1334
1335   dm[0]= 131.65*tanAlpha-space;
1336   dm[1]= 136.5*tanAlpha-space;
1337   dm[3]= 2.425;
1338
1339   zBar = -dR +131.65+dm[3]-rLow;
1340
1341   gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1342
1343   // upper bar
1344
1345   dm[0]= 240.4*tanAlpha-space;
1346   dm[1]= rUp*tanAlpha-space;
1347   dm[3]= 1.55;
1348
1349   zBar = dR-dm[3];
1350
1351   gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1352
1353   //  positioning of the empty spaces into the main wheel
1354
1355   Float_t rCenter,xc,yc;
1356   Float_t rInner,rOuter; // center of the inner and outer chamber
1357
1358   rCenter = rLow+dR;
1359
1360   rInner = 108.07;
1361   rOuter = 190.68;
1362
1363
1364   for(Int_t ns=0; ns<nInnerSector;ns++){
1365
1366     phi1 = ns * innerOpenAngle + innerAngleShift;
1367     phi1 *= kRaddeg; // in degrees
1368
1369     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1370
1371     if (phi1 > 360.) phi1 -= 360.;
1372
1373     theta1 = 90.;
1374     phi2   = 90.;
1375     theta2 = 180.;
1376     phi3   = ns * innerOpenAngle + innerAngleShift;
1377     phi3 *= kRaddeg; // in degrees
1378
1379     phi3 = (Float_t)TMath::Nint(phi3);
1380
1381     if(phi3 > 360.) phi3 -= 360.;
1382
1383     theta3 = 90.;
1384
1385     // "holes"->End plate
1386
1387     xc = rCenter*TMath::Cos(phi3*kDegrad);
1388     yc = rCenter*TMath::Sin(phi3*kDegrad);
1389
1390     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1391
1392     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1393
1394     // TSCE->TSWC (services wheel volumes)
1395
1396     xc = 166.142*TMath::Cos(phi3*kDegrad);
1397     yc = 166.142*TMath::Sin(phi3*kDegrad);
1398
1399     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1400     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1401
1402
1403     // readout chambers->TDGS (drift gas)
1404
1405     xc = rInner*TMath::Cos(phi3*kDegrad);
1406     yc = rInner*TMath::Sin(phi3*kDegrad);
1407
1408     gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1409
1410     xc = rOuter*TMath::Cos(phi3*kDegrad);
1411     yc = rOuter*TMath::Sin(phi3*kDegrad);
1412
1413     gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1414
1415     nRotMat++;
1416
1417     theta2 = 0.; // reflection
1418
1419     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1420
1421     xc = rInner*TMath::Cos(phi3*kDegrad);
1422     yc = rInner*TMath::Sin(phi3*kDegrad);
1423
1424     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1425
1426     xc = rOuter*TMath::Cos(phi3*kDegrad);
1427     yc = rOuter*TMath::Sin(phi3*kDegrad);
1428
1429     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1430
1431     nRotMat++;
1432
1433   }
1434   // TPMW->TPC
1435
1436   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1437   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1438
1439   //---------------------------------------------------------
1440   //  Tpc High Voltage Membrane - 100 microns of mylar
1441   //---------------------------------------------------------
1442
1443   dm[0]=82.8;
1444   dm[1]=252.;
1445   dm[2]=0.005;
1446
1447   gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1448
1449   gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1450
1451   // Tpc High Voltage membrane Holders
1452
1453   gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1454
1455
1456
1457   // inner
1458
1459   dm[0]=79.3;
1460   dm[1]=82.8;
1461   dm[2]=0.2;
1462
1463   gMC->Gsposp("THVH",1,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1464
1465   // outer
1466
1467   dm[0]= 252.;
1468   dm[1]= 257.9;
1469   dm[2]= 0.4;
1470
1471   gMC->Gsposp("THVH",2,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1472
1473   //----------------------------------------------------------
1474   // TPc Support Rods - MAKROLON
1475   //----------------------------------------------------------
1476
1477   dm[0]= 0.9;
1478   dm[1]= 1.2;
1479
1480   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1481
1482
1483   for(Int_t nrod=0;nrod<18;nrod++){
1484     Float_t angle=innerOpenAngle*(Float_t)nrod;
1485
1486     xc=81.5*TMath::Cos(angle);
1487     yc=81.5*TMath::Sin(angle);
1488
1489     dm[2]=126.7;
1490
1491     gMC->Gsposp("TPSR",nrod+1,"TDGS",xc,yc,126.9,0,"ONLY",dm,3);
1492     gMC->Gsposp("TPSR",nrod+19,"TDGS",xc,yc,-126.9,0,"ONLY",dm,3);
1493
1494     dm[2]=126.6;
1495
1496     xc=254.25*TMath::Cos(angle);
1497     yc=254.25*TMath::Sin(angle);
1498
1499     // rod number 54 contans the HV cable
1500
1501     if(nrod<17) {
1502       gMC->Gsposp("TPSR",nrod+37,"TDGS",xc,yc,127.,0,"ONLY",dm,3);
1503       gMC->Gsposp("TPSR",nrod+54,"TDGS",xc,yc,-127.,0,"ONLY",dm,3);
1504     }
1505
1506   }
1507
1508   //----------------------------------------------------------
1509   // Tpc High Voltage Rod - MAKROLON + Copper cable
1510   //----------------------------------------------------------
1511
1512   // rod with cable (Left)
1513
1514   dm[0]=0.;
1515   dm[1]=2.25;
1516   dm[2]=126.6;
1517
1518   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1519
1520   // HV cable
1521
1522   dm[0]=0.;
1523   dm[1]=0.3;
1524   dm[2]=126.6;
1525
1526   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1527
1528   // empty space
1529
1530   dm[0]=0.3;
1531   dm[1]=1.;
1532   dm[2]=126.6;
1533
1534   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1535
1536   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1537   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1538
1539   // rod without cable
1540
1541   dm[0]=1.8;
1542   dm[1]=2.25;
1543   dm[2]=126.6;
1544
1545   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1546
1547   gMC->Gspos("THVL",1,"TDGS",xc,yc,-127.,0,"ONLY");
1548   gMC->Gspos("THVR",1,"TDGS",xc,yc,127.,0,"ONLY");
1549
1550   gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY");
1551
1552   // services wheel cover -> wheel
1553
1554
1555   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1556   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1557
1558
1559   // put the wheel into the TPC
1560
1561   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1562   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1563
1564   //
1565
1566   gMC->Gsord("TPMW",6);
1567   gMC->Gsord("TSSW",6);
1568   gMC->Gsord("TSWC",6);
1569
1570   // put the TPC into ALIC (main mother volume)
1571
1572   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1573
1574
1575 } // end of function
1576
1577 //_____________________________________________________________________________
1578 void AliTPCv3::DrawDetector()
1579 {
1580   //
1581   // Draw a shaded view of the Time Projection Chamber version 3
1582   //
1583
1584
1585   // Set everything unseen
1586   gMC->Gsatt("*", "seen", -1);
1587   //
1588   // Set ALIC mother transparent
1589   gMC->Gsatt("ALIC","SEEN",0);
1590   //
1591   // Set the volumes visible
1592   //
1593
1594   gMC->Gsatt("TPC ","SEEN",0);
1595   gMC->Gsatt("TOIN","SEEN",1);
1596   gMC->Gsatt("TOIN","COLO",7);
1597   gMC->Gsatt("TOCV","SEEN",1);
1598   gMC->Gsatt("TOCV","COLO",4);
1599   gMC->Gsatt("TSA1","SEEN",0);
1600   gMC->Gsatt("TSA2","SEEN",0);
1601   gMC->Gsatt("TSA3","SEEN",0);
1602   gMC->Gsatt("TSA4","SEEN",0);
1603   gMC->Gsatt("TSA5","SEEN",0);
1604   gMC->Gsatt("TOFC","SEEN",1);
1605   gMC->Gsatt("TOFC","COLO",4);
1606   gMC->Gsatt("TSA6","SEEN",0);
1607   gMC->Gsatt("TSA7","SEEN",0);
1608   gMC->Gsatt("TSA8","SEEN",0);
1609   gMC->Gsatt("TIIN","SEEN",1);
1610   gMC->Gsatt("TIIN","COLO",7);
1611   gMC->Gsatt("TII1","SEEN",0);
1612   gMC->Gsatt("TIFC","SEEN",1);
1613   gMC->Gsatt("TIFC","COLO",4);
1614   gMC->Gsatt("TSA9","SEEN",0);
1615   gMC->Gsatt("TS10","SEEN",0);
1616   gMC->Gsatt("TS11","SEEN",0);
1617   gMC->Gsatt("TS12","SEEN",0);
1618   gMC->Gsatt("TS13","SEEN",0);
1619   gMC->Gsatt("TS14","SEEN",0);
1620   gMC->Gsatt("TICC","SEEN",0);
1621   gMC->Gsatt("TICM","SEEN",0);
1622   gMC->Gsatt("TS15","SEEN",0);
1623   gMC->Gsatt("TS16","SEEN",0);
1624   gMC->Gsatt("TS17","SEEN",0);
1625   gMC->Gsatt("TS18","SEEN",0);
1626   gMC->Gsatt("TS19","SEEN",0);
1627   gMC->Gsatt("TPJ1","SEEN",0);
1628   gMC->Gsatt("TPJ2","SEEN",0);
1629   gMC->Gsatt("TICS","SEEN",0);
1630   gMC->Gsatt("TDGS","SEEN",0);
1631   gMC->Gsatt("TIRC","SEEN",0);
1632   gMC->Gsatt("TIC1","SEEN",1);
1633   gMC->Gsatt("TIPP","SEEN",0);
1634   gMC->Gsatt("TIC3","SEEN",0);
1635   gMC->Gsatt("TRCE","SEEN",0);
1636   gMC->Gsatt("TPSC","SEEN",0);
1637   gMC->Gsatt("TPCC","SEEN",0);
1638   gMC->Gsatt("TORC","SEEN",0);
1639   gMC->Gsatt("TOPP","SEEN",0);
1640   gMC->Gsatt("TOC3","SEEN",0);
1641   gMC->Gsatt("TOC1","SEEN",1);
1642   gMC->Gsatt("TSSW","SEEN",1);
1643   gMC->Gsatt("TSWC","SEEN",1);
1644   gMC->Gsatt("TSSW","COLO",3);
1645   gMC->Gsatt("TSWC","COLO",3);
1646   gMC->Gsatt("TSCE","COLO",6);
1647   gMC->Gsatt("TSCE","SEEN",1);
1648   gMC->Gsatt("TWES","SEEN",0);
1649   gMC->Gsatt("TSWB","SEEN",0);
1650   gMC->Gsatt("TPEL","SEEN",0);
1651   gMC->Gsatt("TPMW","SEEN",1);
1652   gMC->Gsatt("TESR","SEEN",1);
1653   gMC->Gsatt("TPMW","COLO",12);
1654   gMC->Gsatt("TIC1","COLO",5);
1655   gMC->Gsatt("TOC1","COLO",5);
1656   gMC->Gsatt("TESB","SEEN",0);
1657   gMC->Gsatt("THVM","SEEN",1);
1658   gMC->Gsatt("THVM","COLO",11);
1659   gMC->Gsatt("THVH","SEEN",0);
1660   gMC->Gsatt("TPSR","SEEN",0);
1661   gMC->Gsatt("THVL","SEEN",0);
1662   gMC->Gsatt("THVC","SEEN",0);
1663   gMC->Gsatt("THVE","SEEN",0);
1664   gMC->Gsatt("THVR","SEEN",0);
1665
1666   //
1667   gMC->Gdopt("hide", "on");
1668   gMC->Gdopt("shad", "on");
1669   gMC->Gsatt("*", "fill", 7);
1670   gMC->SetClipBox(".");
1671   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1672   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1673   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1674   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1675   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1676   gMC->DefaultRange();
1677   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1678   gMC->Gdhead(1111, "Time Projection Chamber");
1679   gMC->Gdman(18, 4, "MAN");
1680   gMC->Gdopt("hide","off");
1681 }
1682
1683 //_____________________________________________________________________________
1684 void AliTPCv3::CreateMaterials()
1685 {
1686   //
1687   // Define materials for version 2 of the Time Projection Chamber
1688   //
1689
1690
1691   //
1692   AliTPC::CreateMaterials();
1693 }
1694
1695 //_____________________________________________________________________________
1696 void AliTPCv3::Init()
1697 {
1698   //
1699   // Initialises version 3 of the TPC after that it has been built
1700   //
1701   Int_t *idtmed = fIdtmed->GetArray();
1702
1703   AliTPC::Init();
1704
1705   fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1706
1707   gMC->SetMaxNStep(30000); // max. number of steps increased
1708
1709   gMC->Gstpar(idtmed[2],"LOSS",5);
1710
1711   printf("%s: *** TPC version 3 initialized***\n",ClassName());
1712
1713   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1714
1715   // printf("*** TPC version 3 initialized ***\n");
1716   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1717
1718   //
1719
1720 }
1721
1722 //_____________________________________________________________________________
1723 void AliTPCv3::StepManager()
1724 {
1725   //
1726   // Called for every step in the Time Projection Chamber
1727   //
1728
1729   //
1730   // parameters used for the energy loss calculations
1731   //
1732   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1733   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1734   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1735
1736
1737   const Float_t kbig = 1.e10;
1738
1739   Int_t id,copy;
1740   TLorentzVector pos;
1741   Float_t hits[4];
1742   Int_t vol[2];
1743
1744   vol[1]=0;
1745   vol[0]=0;
1746
1747   //
1748
1749   gMC->SetMaxStep(kbig);
1750
1751   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1752
1753   Float_t charge = gMC->TrackCharge();
1754
1755   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1756
1757
1758   id=gMC->CurrentVolID(copy);
1759
1760   // Check the sensitive volume
1761
1762   if (id != fIdSens) return;
1763
1764   //
1765   //  charged particle is in the sensitive volume
1766   //
1767
1768   if(gMC->TrackStep() > 0) {
1769
1770
1771     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1772     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1773
1774     gMC->TrackPosition(pos);
1775     hits[0]=pos[0];
1776     hits[1]=pos[1];
1777     hits[2]=pos[2];
1778
1779     //
1780     // check the selected side of the TPC
1781     //
1782
1783     if(fSide && fSide*hits[2]<=0.) return;
1784
1785     hits[3]=(Float_t)nel;
1786
1787     // Add this hit
1788
1789     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
1790
1791   }
1792
1793   // Stemax calculation for the next step
1794
1795   Float_t pp;
1796   TLorentzVector mom;
1797   gMC->TrackMomentum(mom);
1798   Float_t ptot=mom.Rho();
1799   Float_t betaGamma = ptot/gMC->TrackMass();
1800
1801   Int_t pid=gMC->TrackPid();
1802   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1803     {
1804       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1805     }
1806   else
1807     {
1808       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1809       pp=kprim*BetheBloch(betaGamma);
1810       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1811     }
1812
1813   Double_t rnd = gMC->GetRandom()->Rndm();
1814
1815   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1816
1817 }
1818
1819 //_____________________________________________________________________________
1820 Float_t AliTPCv3::BetheBloch(Float_t bg)
1821 {
1822   //
1823   // Bethe-Bloch energy loss formula
1824   //
1825   const Double_t kp1=0.76176e-1;
1826   const Double_t kp2=10.632;
1827   const Double_t kp3=0.13279e-4;
1828   const Double_t kp4=1.8631;
1829   const Double_t kp5=1.9479;
1830
1831   Double_t dbg = (Double_t) bg;
1832
1833   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1834
1835   Double_t aa = TMath::Power(beta,kp4);
1836   Double_t bb = TMath::Power(1./dbg,kp5);
1837
1838   bb=TMath::Log(kp3+bb);
1839
1840   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1841 }