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 1.26  2001/04/27 15:23:07  kowal2
  19 Correct materian in the central part of the inner containment vessel
  20
  21 Revision 1.25  2001/04/26 06:15:12  kowal2
  22 Corrected bug in the inner containment vessel (cones)
  23
  24 Revision 1.24  2001/04/24 11:22:01  kowal2
  25 Protection against too small betagamma
  26
  27 Revision 1.23  2001/04/24 11:17:33  kowal2
  28 New TPC geometry.
  29
  30 Revision 1.22  2001/03/13 13:07:34  kowal2
  31 Corrected bug in the TPC mother volume geometry.
  32 Thanks to A. Morsch
  33
  34 Revision 1.21  2000/11/30 11:48:50  kowal2
  35 TLorentzVector.h adde to satisfy the latest changes by Federico
  36
  37 Revision 1.20  2000/11/14 10:48:57  kowal2
  38 Correct material used for TSA4. Thanks to J. Barbosa.
  39
  40 Revision 1.19  2000/11/06 17:24:10  kowal2
  41 Corrected bug in the outer containment vessel and
  42 the outer field cage geometry.
  43 Thanks to J. Barbosa.
  44
  45 Revision 1.18  2000/11/02 16:55:24  kowal2
  46 Corrected bug in the inner containment vessel geometry.
  47 Thanks to J. Belikov
  48
  49 Revision 1.17  2000/11/02 07:24:11  kowal2
  50 Correction in the TPC geometry.
  51 Changes due to the new hit structure.
  52
  53 Revision 1.16  2000/10/02 21:28:18  fca
  54 Removal of useless dependecies via forward declarations
  55
  56 Revision 1.15  2000/07/10 20:57:39  hristov
  57 Update of TPC code and macros by M.Kowalski
  58
  59 Revision 1.14  2000/06/30 12:07:50  kowal2
  60 Updated from the TPC-PreRelease branch
  61
  62 Revision 1.13.2.4  2000/06/26 07:39:42  kowal2
  63 Changes to obey the coding rules
  64
  65 Revision 1.13.2.3  2000/06/25 08:38:41  kowal2
  66 Splitted from AliTPCtracking
  67
  68 Revision 1.13.2.2  2000/06/16 12:58:13  kowal2
  69 Changed parameter settings
  70
  71 Revision 1.13.2.1  2000/06/09 07:15:07  kowal2
  72
  73 Defaults loaded automatically (hard-wired)
  74 Optional parameters can be set via macro called in the constructor
  75
  76 Revision 1.13  2000/05/15 10:00:30  kowal2
  77 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
  78
  79 Revision 1.12  2000/04/17 09:37:33  kowal2
  80 removed obsolete AliTPCDigitsDisplay.C
  81
  82 Revision 1.11.8.2  2000/04/10 08:36:12  kowal2
  83
  84 Updated readout chambers
  85 Some modifications to StepManager by M. Kowalski
  86
  87 Revision 1.11.8.1  2000/04/10 07:56:53  kowal2
  88 Not used anymore - removed
  89
  90 Revision 1.11  1999/11/04 17:28:07  fca
  91 Correct barrel part of HV Degrader
  92
  93 Revision 1.10  1999/10/14 16:52:08  fca
  94 Only use PDG codes and not GEANT ones
  95
  96 Revision 1.9  1999/10/08 06:27:23  fca
  97 Corrected bug in the HV degrader geometry, thanks to G.Tabary
  98
  99 Revision 1.8  1999/10/04 13:39:55  fca
 100 Correct array index problem
 101
 102 Revision 1.7  1999/09/29 09:24:34  fca
 103 Introduction of the Copyright and cvs Log
 104
 105 */
 106
 107 //
 108 ///////////////////////////////////////////////////////////////////////////////
 109 //                                                                           //
 110 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
 111 //
 112 //Begin_Html
 113 /*
 114 <img src="picts/AliTPCv3Class.gif">
 115 */
 116 //End_Html
 117 //                                                                           //
 118 //                                                                           //
 119 ///////////////////////////////////////////////////////////////////////////////
 120
 121 #include <stdlib.h>
 122 #include <TMath.h>
 123 #include "AliTPCv3.h"
 124 #include "AliRun.h"
 125 #include "AliMC.h"
 126 #include "AliConst.h"
 127 #include "AliTPCDigitsArray.h"
 128 #include"AliTPCParam.h"
 129 #include"AliTPCParamSR.h"
 130 #include "AliPDG.h"
 131 #include <TInterpreter.h>
 132 #include "TLorentzVector.h"
 133 #include "AliTPCTrackHits.h"
 134
 135 ClassImp(AliTPCv3)
 136 //_____________________________________________________________________________
 137
 138   AliTPCv3::AliTPCv3(){
 139
 140   fHitType = 1;
 141
 142 }
 143
 144 //_____________________________________________________________________________
 145 AliTPCv3::AliTPCv3(const char *name, const char *title) :
 146   AliTPC(name, title)
 147 {
 148   //
 149   // Standard constructor for Time Projection Chamber version 3
 150   //
 151
 152   SetBufferSize(128000);
 153   fIdSens=0;
 154
 155   SetGasMixt(2,20,10,-1,0.9,0.1,0.);
 156
 157   if (fTPCParam)
 158      fTPCParam->Write(fTPCParam->GetTitle());
 159
 160   fHitType =1;
 161 }
 162
 163 //_____________________________________________________________________________
 164 void AliTPCv3::CreateGeometry()
 165 {
 166   //
 167   // Creation of the TPC coarse geometry (version 3)
 168   // The whole drift volume is sensitive
 169   // Origin Marek Kowalski Cracow
 170   //
 171   //Begin_Html
 172   /*
 173     <img src="picts/AliTPCgif">
 174   */
 175   //End_Html
 176   //Begin_Html
 177   /*
 178     <img src="picts/AliTPCv3Tree.gif">
 179   */
 180   //End_Html
 181   Float_t dm[50];
 182
 183   Int_t *idtmed = fIdtmed->GetArray(); // TPC media
 184
 185   Int_t idrotm[120]; // rotation matrices
 186
 187   Int_t nRotMat = 0; // actual number of rotation matrices
 188
 189
 190   //
 191   //  Mother volume (Air) - all volumes will be positioned in it
 192   //
 193
 194   dm[0]=0.;
 195   dm[1]=360.;
 196   dm[2]=8.;
 197
 198   //
 199
 200   dm[3]=-283.7;
 201   dm[4]=65.6;
 202   dm[5]=278.;
 203
 204   //
 205
 206   dm[6]=-253.6;
 207   dm[7]=65.6;
 208   dm[8]=278.;
 209
 210   //
 211
 212   dm[9]=-73.3;
 213   dm[10]=60.9;
 214   dm[11]=278.;
 215
 216   //
 217
 218   dm[12]=-73.3;
 219   dm[13]=56.9;
 220   dm[14]=278.;
 221
 222   //
 223
 224   dm[15]=73.3;
 225   dm[16]=56.9;
 226   dm[17]=278.;
 227
 228   //
 229
 230   dm[18]=73.3;
 231   dm[19]=60.9;
 232   dm[20]=278.;
 233
 234   //
 235
 236   dm[21]=253.6;
 237   dm[22]=65.6;
 238   dm[23]=278.;
 239
 240   //
 241
 242   dm[24]=283.7;
 243   dm[25]=65.6;
 244   dm[26]=278.;
 245
 246   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
 247
 248   // outer part
 249
 250   //-------------------------------------------------------------------
 251   //   Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
 252   //-------------------------------------------------------------------
 253
 254   dm[0]= 0.;
 255   dm[1]= 360.;
 256   dm[2]= 6.;
 257
 258   //
 259
 260   dm[3]=-253.6;
 261   dm[4]=258.;
 262   dm[5]=275.5;
 263
 264   //
 265
 266   dm[6]=-250.6;
 267   dm[7]=258.;
 268   dm[8]=275.5;
 269
 270   //
 271
 272   dm[9]=-250.6;
 273   dm[10]=258.;
 274   dm[11]=278.;
 275
 276   //
 277
 278   dm[12]=253.6;
 279   dm[13]=258.;
 280   dm[14]=278.;
 281
 282   //
 283
 284   dm[15]=253.6;
 285   dm[16]=264.8;
 286   dm[17]=278.;
 287
 288   //
 289
 290   dm[18]=256.6;
 291   dm[19]=264.8;
 292   dm[20]=278.;
 293
 294   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 295
 296   //----------------------------------------------------------------
 297   // Tpc Outer Contaiment Vessel
 298   //  mother volume - Al, daughters - composite (sandwich)
 299   //----------------------------------------------------------------
 300
 301   dm[0]=0.;
 302   dm[1]=360.;
 303   dm[2]=6.;
 304
 305   //
 306
 307   dm[3]=-250.6;
 308   dm[4]=270.4;
 309   dm[5]=278.;
 310
 311   //
 312
 313   dm[6]=-247.6;
 314   dm[7]=270.4;
 315   dm[8]=278.;
 316
 317   //
 318
 319   dm[9]=-247.6;
 320   dm[10]=274.8124;
 321   dm[11]=278.;
 322
 323   //
 324
 325   dm[12]=253.6;
 326   dm[13]=274.8124;
 327   dm[14]=278.;
 328
 329   //
 330
 331   dm[15]=253.6;
 332   dm[16]=264.8;
 333   dm[17]=278.;
 334
 335   //
 336
 337   dm[18]=256.6;
 338   dm[19]=264.8;
 339   dm[20]=278.;
 340
 341   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 342
 343   // Daughter volumes - sandwich
 344
 345   // Tpc SAndwich 1 - Al
 346
 347   dm[0]=274.8124;
 348   dm[1]=278.;
 349   dm[2]=252.1;
 350
 351   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 352
 353   // Tpc SAndwich 2 - epoxy glue (I use Lexan)
 354
 355   dm[0] += 5.e-3;
 356   dm[1] -= 5.e-3;
 357
 358   gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
 359
 360   // Tpc SAndwich 3 - Tedlar
 361
 362   dm[0] += 0.01;
 363   dm[1] -= 0.01;
 364
 365   gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
 366
 367
 368   // Tpc SAndwich 4 - fiber glass (G10)
 369
 370   dm[0] += 3.8e-3;
 371   dm[1] -= 3.8e-3;
 372
 373   gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
 374
 375   // Tpc SAndwich 5 - NOMEX honeycomb
 376
 377   dm[0] += 0.075;
 378   dm[1] -= 0.075;
 379
 380   gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
 381
 382   // 5->4->3->2->1->TCOV
 383
 384
 385   gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
 386   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 387   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 388   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 389
 390   gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
 391
 392   // TCOV-> TOIN
 393
 394   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 395
 396   //-------------------------------------------------------
 397   //  Tpc Outer Field Cage
 398   //  mother volume - Al, daughters - composite (sandwich)
 399   //-------------------------------------------------------
 400
 401   dm[0]=0.;
 402   dm[1]=360.;
 403   dm[2]=6.;
 404
 405   //
 406
 407   dm[3]=-253.6;
 408   dm[4]=258.;
 409   dm[5]=275.5;
 410
 411   //
 412
 413   dm[6]=-250.6;
 414   dm[7]=258.;
 415   dm[8]=275.5;
 416
 417   //
 418
 419   dm[9]=-250.6;
 420   dm[10]=258.;
 421   dm[11]=260.0476;
 422
 423   //
 424
 425   dm[12]=250.6;
 426   dm[13]=258.;
 427   dm[14]=260.0476;
 428
 429   //
 430
 431   dm[15]=250.6;
 432   dm[16]=258.;
 433   dm[17]=275.5;
 434
 435   //
 436
 437   dm[18]=253.6;
 438   dm[19]=258.;
 439   dm[20]=275.5;
 440
 441   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 442
 443   // Daughter volumes
 444
 445   // Tpc SAndwich 6 - Tedlar
 446
 447   dm[0]= 258.;
 448   dm[1]= 260.0476;
 449   dm[2]= 252.1;
 450
 451   gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
 452
 453   // Tpc SAndwich 7 - fiber glass
 454
 455   dm[0] += 3.8e-3;
 456   dm[1] -= 3.8e-3;
 457
 458   gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
 459
 460
 461   // Tpc SAndwich 8 - NOMEX
 462
 463   dm[0] += 0.02;
 464   dm[1] -= 0.02;
 465
 466   gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
 467
 468   // 8->7->6->TOFC
 469
 470   gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
 471   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 472   gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
 473
 474   // TOFC->TOIN
 475
 476   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 477
 478   // TOIN->TPC
 479
 480   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 481
 482   // inner part
 483
 484   //--------------------------------------------------------------------
 485   // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
 486   // Inner containment vessel will be placed directly in the TPC
 487   //--------------------------------------------------------------------
 488
 489   dm[0]=0.;
 490   dm[1]=360.;
 491   dm[2]=4.;
 492
 493   //
 494
 495   dm[3]=-253.6;
 496   dm[4]=65.9;
 497   dm[5]=79.2;
 498
 499   //
 500
 501   dm[6]=-73.3;
 502   dm[7]=61.2;
 503   dm[8]=79.2;
 504
 505   //
 506
 507   dm[9]=73.3;
 508   dm[10]=61.2;
 509   dm[11]=79.2;
 510
 511   //
 512
 513   dm[12]=253.6;
 514   dm[13]=65.9;
 515   dm[14]=79.2;
 516
 517   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
 518
 519   // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
 520
 521   dm[0]=79.16;
 522   dm[1]=79.2;
 523   dm[2]=88.;
 524
 525   gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
 526
 527   gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
 528
 529   //-----------------------------------------------------
 530   // Tpc Inner Field Cage
 531   // mother volume - Al, daughters - composite (sandwich)
 532   //------------------------------------------------------
 533
 534   dm[0]=0.;
 535   dm[1]=360.;
 536   dm[2]=10.;
 537
 538   //
 539
 540   dm[3]=-253.6;
 541   dm[4]=70.3;
 542   dm[5]=79.2;
 543
 544   //
 545
 546   dm[6]=-250.6;
 547   dm[7]=70.3;
 548   dm[8]=79.2;
 549
 550   //
 551
 552   dm[9]=-250.6;
 553   dm[10]=77.0524;
 554   dm[11]=79.2;
 555
 556   //
 557
 558   dm[12]=-88.;
 559   dm[13]=77.0524;
 560   dm[14]=79.2;
 561
 562   //
 563
 564   dm[15]=-88.;
 565   dm[16]=77.0924;
 566   dm[17]=79.16;
 567
 568   //
 569
 570   dm[18]=88.;
 571   dm[19]=77.0924;
 572   dm[20]=79.16;
 573
 574   //
 575
 576   dm[21]=88.;
 577   dm[22]=77.0524;
 578   dm[23]=79.2;
 579
 580   //
 581
 582   dm[24]=250.6;
 583   dm[25]=77.0524;
 584   dm[26]=79.2;
 585
 586   //
 587
 588   dm[27]=250.6;
 589   dm[28]=70.3;
 590   dm[29]=79.2;
 591
 592   //
 593
 594   dm[30]=253.6;
 595   dm[31]=70.3;
 596   dm[32]=79.2;
 597
 598   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
 599
 600   // daughter volumes - central part
 601
 602   // Tpc Sandwich 9 -Tedlar
 603
 604   dm[0]=77.0924;
 605   dm[1]=79.16;
 606   dm[2]=88.;
 607
 608   gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
 609
 610   // Tpc Sandwich 10 - fiber glass (G10)
 611
 612   dm[0] += 3.8e-3;
 613   dm[1] -= 3.8e-3;
 614
 615   gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
 616
 617   // Tpc Sandwich 11 - NOMEX
 618
 619   dm[0] += 0.03;
 620   dm[1] -= 0.03;
 621
 622   gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
 623
 624   // 11->10->9->TIFC
 625
 626   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 627   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 628
 629   gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
 630
 631   // daughter volumes - outer parts (reinforced)
 632
 633   // Tpc Sandwich 12 -Tedlar
 634
 635   dm[0]=77.0524;
 636   dm[1]=79.2;
 637   dm[2]=82.05;
 638
 639   gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
 640
 641   // Tpc Sandwich 13 - fiber glass (G10)
 642
 643   dm[0] += 3.8e-3;
 644   dm[1] -= 3.8e-3;
 645
 646   gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
 647
 648   // Tpc Sandwich 14 - NOMEX
 649
 650   dm[0] += 0.07;
 651   dm[1] -= 0.07;
 652
 653   gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
 654
 655   // 14->13->12->TIFC
 656
 657   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 658   gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
 659
 660   gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
 661   gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
 662
 663   // place this inside the inner insulator
 664
 665   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
 666
 667   // and now in the TPC...
 668
 669   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 670
 671   //---------------------------------------------------------
 672   // Tpc Inner Containment vessel - Cones
 673   //---------------------------------------------------------
 674
 675   dm[0]=0.;
 676   dm[1]=360.;
 677   dm[2]=8.;
 678
 679   //
 680
 681   dm[3]=71.8;
 682   dm[4]=56.9;
 683   dm[5]=59.4;
 684
 685   //
 686
 687   dm[6]=73.;
 688   dm[7]=56.9;
 689   dm[8]=59.4;
 690
 691   //
 692
 693   dm[9]=73.;
 694   dm[10]=56.9;
 695   dm[11]=61.2;
 696
 697   //
 698
 699   dm[12]=73.3;
 700   dm[13]=56.9;
 701   dm[14]=61.2;
 702
 703   //
 704
 705   dm[15]=73.3;
 706   dm[16]=60.9;
 707   dm[17]=61.2;
 708
 709   //
 710
 711   dm[18]=253.6;
 712   dm[19]=65.6;
 713   dm[20]=65.9;
 714
 715   //
 716
 717   dm[21]=253.6;
 718   dm[22]=65.6;
 719   dm[23]=74.6;
 720
 721   //
 722
 723   dm[24]=256.6;
 724   dm[25]=65.6;
 725   dm[26]=74.6;
 726
 727   gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
 728
 729   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
 730
 731   // reflection matrix
 732
 733   theta1 = 90.;
 734   phi1   = 0.;
 735   theta2 = 90.;
 736   phi2   = 270.;
 737   theta3 = 180.;
 738   phi3   = 0.;
 739
 740   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 741
 742   gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
 743   gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 744
 745
 746   //---------------------------------------------------------
 747   // Tpc Inner Containment vessel - Middle part -Al
 748   //---------------------------------------------------------
 749
 750   dm[0]=0.;
 751   dm[1]=360.;
 752   dm[2]=6.;
 753
 754   //
 755
 756   dm[3]=-71.6;
 757   dm[4]=60.2;
 758   dm[5]=61.2;
 759
 760   //
 761
 762   dm[6]=-69.1;
 763   dm[7]=60.2;
 764   dm[8]=61.2;
 765
 766   //
 767
 768   dm[9]=-69.1;
 769   dm[10]=60.6224;
 770   dm[11]=61.2;
 771
 772   //
 773
 774   dm[12]=69.1;
 775   dm[13]=60.6224;
 776   dm[14]=61.2;
 777
 778   //
 779
 780   dm[15]=69.1;
 781   dm[16]=60.2;
 782   dm[17]=61.2;
 783
 784   //
 785
 786   dm[18]=71.6;
 787   dm[19]=60.2;
 788   dm[20]=61.2;
 789
 790   gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
 791
 792   // Tpc Sandwich 15 - Al
 793
 794   dm[0]=60.6224;
 795   dm[1]=61.2;
 796   dm[2]=70.1;
 797
 798   gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
 799
 800   // Tpc Sandwich 16 -  epoxy glue
 801
 802   dm[0] += 5.e-3;
 803   dm[1] -= 5.e-3;
 804
 805   gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
 806
 807   // Tpc Sandwich 17 - Tedlar
 808
 809   dm[0] += 0.01;
 810   dm[1] -= 0.01;
 811
 812   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 813
 814   // Tpc Sandwich 18 - carbon fiber
 815
 816   dm[0] += 3.8e-3;
 817   dm[1] -= 3.8e-3;
 818
 819   gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
 820
 821   // Tpc Sandwich 19 - Nomex
 822
 823   dm[0] += 0.02;
 824   dm[1] -= 0.02;
 825
 826   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
 827
 828   // 19->18->17->16->15-> TICM
 829
 830   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
 831   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
 832   gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
 833   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 834
 835   gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
 836
 837
 838   // TPc inner cont. vessel Joints
 839
 840   dm[0]=60.2;
 841   dm[1]=61.2;
 842   dm[2]=0.5;
 843
 844   gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
 845
 846   gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
 847   gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
 848
 849   //
 850
 851   dm[0]=0.;
 852   dm[1]=360.;
 853   dm[2]=4.;
 854
 855   //
 856
 857   dm[3]=70.8;
 858   dm[4]=58.4;
 859   dm[5]=60.1;
 860
 861   //
 862
 863   dm[6]=71.2;
 864   dm[7]=58.4;
 865   dm[8]=60.1;
 866
 867   //
 868
 869   dm[9]=71.2;
 870   dm[10]=58.4;
 871   dm[11]=59.4;
 872
 873   //
 874
 875   dm[12]=71.6;
 876   dm[13]=58.4;
 877   dm[14]=59.4;
 878
 879   gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
 880
 881   gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
 882   gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 883
 884
 885
 886   // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
 887
 888   dm[0]=58.4;
 889   dm[1]=61.2;
 890   dm[2]=0.1;
 891
 892   gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
 893
 894   gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
 895   gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
 896
 897   // TICM -> TPC
 898
 899   gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
 900
 901   //
 902
 903   nRotMat++; // prepare for the next rotation matrix
 904
 905   //---------------------------------------------------------
 906   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
 907   //  and its daughters (HV membrane, rods, readout chambers)
 908   //---------------------------------------------------------
 909
 910   dm[0]= 79.2;
 911   dm[1]= 258.0;
 912   dm[2]= 253.6;
 913
 914   gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);
 915
 916   // sector opening angles
 917
 918   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
 919
 920   // sector angle shift
 921
 922   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
 923
 924   // number of sectors
 925
 926   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 927   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 928
 929   // All above parameters are identical for inner and outer
 930   // sectors. The distinction is kept for the historical reasons
 931   // and eventually will disappear.
 932
 933   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
 934   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
 935   Float_t space;
 936
 937   //-------------------------------------------------------------------------
 938   //   Tpc Inner Readout Chambers
 939   //-------------------------------------------------------------------------
 940
 941   dm[0]= 14.483;
 942   dm[1]= 23.3345;
 943   dm[2]= 1.6; // thickness
 944   dm[3]= 25.1;
 945
 946   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
 947
 948   // this volume will be positioned in the empty space
 949   // of the end-cap to avoid overlaps
 950
 951   dm[0]= 13.7305;
 952   dm[1]= 21.1895;
 953   dm[2]= 2.25;
 954   dm[3]= 21.15;
 955
 956   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
 957
 958
 959   //------------------------------------------------
 960   // Tpc Inner readout chamber Pad Plane
 961   //------------------------------------------------
 962
 963   dm[0]= 14.483;
 964   dm[1]= 23.3345;
 965   dm[2]= 0.5;
 966   dm[3]= 25.1;
 967
 968   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
 969
 970   //
 971
 972   dm[0] -= 1.218511934;
 973   dm[1] -= 1.218511934;
 974   dm[2] = 0.35;
 975
 976   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
 977
 978   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
 979
 980   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
 981
 982
 983   //----------------------------------------------
 984   // Tpc Readout Chambers Empty spaces - for both
 985   // inner and outer sectors
 986   //----------------------------------------------
 987
 988   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
 989
 990   // Inner sector - 4 spaces
 991
 992
 993   dm[3] = 4.7625;
 994   dm[0] = 12.472;
 995
 996   Float_t rr = 90.52;
 997   Float_t zz;
 998
 999   zz= -12.7875;
1000
1001   space = rr*tanAlpha-dm[0];
1002
1003   for(Int_t nsLow=0;nsLow<4;nsLow++){
1004
1005     rr += 9.525;
1006     dm[1]= rr*tanAlpha - space;
1007
1008     dm[2]=0.8;
1009
1010     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1011
1012     //
1013
1014     dm[2] = 1.2;
1015
1016     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1017
1018     rr += 0.4;
1019     dm[0] = rr*tanAlpha - space;
1020     zz += (0.4+9.525);
1021
1022   }
1023
1024   dm[0]= 12.472;
1025   // dm[1] - this is the dm[1] from the previous TRCE
1026   dm[2]= 1.05;
1027   dm[3]= 19.65;
1028
1029   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1030
1031   //
1032   // TPc Space for Connectors
1033   //
1034
1035   dm[0]= .3;
1036   dm[1]= .3;
1037   dm[2]= 4.5;
1038
1039   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1040
1041   // TPC Connectors
1042
1043   dm[0]= .25;
1044   dm[1]= .15;
1045   dm[2]= 3.75;
1046
1047   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1048
1049   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1050
1051   zz = -12.7875;
1052
1053
1054   Float_t alpha;
1055   Float_t astep;
1056
1057   // inner part of the inner sector - 2 x 20 holes
1058
1059   astep = 20.00096874/19.;
1060
1061   alpha = 10.00048437-astep;
1062
1063   Float_t x1,x2;
1064
1065     x1 = 13.31175725;
1066     x1 -= 0.996357832;
1067
1068     x2 = 15.06180253;
1069     x2 -= 1.163028812;
1070
1071   Int_t ncon;
1072
1073   for(ncon=0;ncon<20;ncon++){
1074
1075     phi1 = 0.;
1076     theta1 = 90.+alpha;
1077     phi2=90.;
1078     theta2 = 90.;
1079     phi3 = (alpha>0) ? 0. : 180.;
1080     theta3 = TMath::Abs(alpha);
1081
1082     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1083
1084
1085
1086     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1087     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1088
1089
1090     x1 -= 1.296357833;
1091     x2 -= 1.463028812;
1092
1093     alpha -= astep;
1094     nRotMat++;
1095
1096   }
1097
1098   // outer part of the inner sector - 2 x 25 holes
1099
1100    astep = 20.00096874/24.;
1101    alpha = 10.00048437-astep;
1102
1103    x1 = 16.81184781;
1104    x1 -= 1.016295986;
1105
1106    x2 = 18.5618931;
1107    x2 -= 1.150914854;
1108
1109   for(ncon=0;ncon<25;ncon++){
1110
1111     phi1 = 0.;
1112     theta1 = 90.+alpha;
1113     phi2=90.;
1114     theta2 = 90.;
1115     phi3 = (alpha>0) ? 0. : 180.;
1116     theta3 = TMath::Abs(alpha);
1117
1118     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1119
1120
1121
1122     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1123     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1124
1125
1126     x1 -= 1.316295986;
1127     x2 -= 1.450914854;
1128
1129     alpha -= astep;
1130     nRotMat++;
1131
1132   }
1133
1134   //--------------------------------------------------------------------------
1135   //  TPC Outer Readout Chambers
1136   //  this is NOT a final design
1137   //--------------------------------------------------------------------------
1138
1139   dm[0]= 23.3875;
1140   dm[1]= 43.524;
1141   dm[2]= 1.5; //thickness
1142   dm[3]= 57.1;
1143
1144   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1145
1146   //------------------------------------------------
1147   // Tpc Outer readout chamber Pad Plane
1148   //------------------------------------------------
1149
1150   dm[2]= 0.5;
1151
1152   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1153
1154   dm[0] -= 1.218511934;
1155   dm[1] -= 1.218511934;
1156   dm[2] = 0.35;
1157
1158   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1159
1160   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1161
1162   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1163
1164   // empty space
1165
1166   dm[0]= 21.035;
1167   dm[1]= 38.7205;
1168   dm[2]= 0.7;
1169   dm[3]= 50.15;
1170
1171   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1172
1173   dm[0]= 22.2935;
1174   dm[1]= 40.5085;
1175   dm[2]= 2.25;
1176   dm[3]= 51.65;
1177
1178   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1179
1180   dm[0]= 21.35;
1181   dm[1]= 38.7205;
1182   dm[2]= 2.25;
1183   dm[3]= 50.15;
1184
1185   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1186
1187   //-----------------------------------------------
1188   // Tpc Services Support Wheel
1189   //-----------------------------------------------
1190
1191   dm[0]=0.;
1192   dm[1]=360.;
1193   dm[2]=18.;
1194   dm[3]=2.;
1195
1196   dm[4]= -5.;
1197   dm[5]= 77.017;
1198   dm[6]= 255.267;
1199
1200   dm[7]= 5.;
1201   dm[8]= dm[5];
1202   dm[9]= dm[6];
1203
1204   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1205
1206   // Tpc Services Wheel Cover
1207
1208   dm[4]= -0.5;
1209   dm[7]= 0.5;
1210
1211   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1212
1213   // Tpc Service wheel Cover Empty space
1214
1215   dm[0]= 10.99;
1216   dm[1]= 39.599;
1217   dm[2]= .5;
1218   dm[3]= 81.125;
1219
1220   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1221
1222   // Tpc services Wheel Empty Spaces
1223
1224   dm[0]= 13.18017507;
1225   dm[1]= 44.61045938;
1226   dm[2]= 4.;
1227   dm[3]= 89.125;
1228
1229   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1230
1231   // Tpc Services Wheel Bars
1232
1233   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1234
1235   // bars-> TWES
1236
1237   dm[2]= 4.;
1238   dm[3]= .4;
1239
1240   dm[0]= 13.8149522;
1241   dm[1]= 13.95601379;
1242
1243   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1244
1245   dm[0]= 43.83462067;
1246   dm[1]= 43.97568225;
1247
1248   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1249
1250   // TPc ELectronics - right now 30% X0 Si
1251
1252   dm[0]= 14.03813696;
1253   dm[1]= 43.3524075;
1254   dm[2]= 1.404;
1255   dm[3]= 83.125;
1256
1257   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1258   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1259
1260   //--------------------------------------------------------------------------
1261   //  End caps
1262   //--------------------------------------------------------------------------
1263
1264   // TPc Main Wheel - Al
1265
1266   dm[0]= 74.9;
1267   dm[1]= 264.4;
1268   dm[2]= 3.0;
1269
1270   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1271
1272   //--------------------------------------------------------------------------
1273   //  Tpc Empty Space for the Readout chambers
1274   //--------------------------------------------------------------------------
1275
1276   Float_t rLow= 86.2;
1277   Float_t rUp= 243.5;
1278   Float_t dR = 0.5*(rUp-rLow);
1279
1280   space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1281
1282   dm[0]= rLow*tanAlpha-space;
1283   dm[1]= rUp*tanAlpha-space;
1284   dm[2] = 3.0;
1285   dm[3]= dR;
1286
1287   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1288
1289   // TIC1->TESR
1290
1291   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1292
1293   // TOC1->TESR
1294
1295   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1296
1297   // Tpc Empty Space Bars - Al (daughters of TESR)
1298
1299   Float_t zBar;
1300
1301   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1302
1303   // lower bar
1304
1305   dm[0]= rLow*tanAlpha-space;
1306   dm[1]= 88.7*tanAlpha-space;
1307   dm[2]= 2.25;
1308   dm[3]= 1.275;
1309
1310   zBar = -dR+dm[3];
1311
1312   gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1313
1314   // middle bar
1315
1316   dm[0]= 131.65*tanAlpha-space;
1317   dm[1]= 136.5*tanAlpha-space;
1318   dm[3]= 2.425;
1319
1320   zBar = -dR +131.65+dm[3]-rLow;
1321
1322   gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1323
1324   // upper bar
1325
1326   dm[0]= 240.4*tanAlpha-space;
1327   dm[1]= rUp*tanAlpha-space;
1328   dm[3]= 1.55;
1329
1330   zBar = dR-dm[3];
1331
1332   gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1333
1334   //  positioning of the empty spaces into the main wheel
1335
1336   Float_t rCenter,xc,yc;
1337   Float_t rInner,rOuter; // center of the inner and outer chamber
1338
1339   rCenter = rLow+dR;
1340
1341   rInner = 108.07;
1342   rOuter = 190.68;
1343
1344
1345   for(Int_t ns=0; ns<nInnerSector;ns++){
1346
1347     phi1 = ns * innerOpenAngle + innerAngleShift;
1348     phi1 *= kRaddeg; // in degrees
1349
1350     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1351
1352     if (phi1 > 360.) phi1 -= 360.;
1353
1354     theta1 = 90.;
1355     phi2   = 90.;
1356     theta2 = 180.;
1357     phi3   = ns * innerOpenAngle + innerAngleShift;
1358     phi3 *= kRaddeg; // in degrees
1359
1360     phi3 = (Float_t)TMath::Nint(phi3);
1361
1362     if(phi3 > 360.) phi3 -= 360.;
1363
1364     theta3 = 90.;
1365
1366     // "holes"->End plate
1367
1368     xc = rCenter*TMath::Cos(phi3*kDegrad);
1369     yc = rCenter*TMath::Sin(phi3*kDegrad);
1370
1371     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1372
1373     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1374
1375     // TSCE->TSWC (services wheel volumes)
1376
1377     xc = 166.142*TMath::Cos(phi3*kDegrad);
1378     yc = 166.142*TMath::Sin(phi3*kDegrad);
1379
1380     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1381     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1382
1383
1384     // readout chambers->TDGS (drift gas)
1385
1386     xc = rInner*TMath::Cos(phi3*kDegrad);
1387     yc = rInner*TMath::Sin(phi3*kDegrad);
1388
1389     gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1390
1391     xc = rOuter*TMath::Cos(phi3*kDegrad);
1392     yc = rOuter*TMath::Sin(phi3*kDegrad);
1393
1394     gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1395
1396     nRotMat++;
1397
1398     theta2 = 0.; // reflection
1399
1400     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1401
1402     xc = rInner*TMath::Cos(phi3*kDegrad);
1403     yc = rInner*TMath::Sin(phi3*kDegrad);
1404
1405     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1406
1407     xc = rOuter*TMath::Cos(phi3*kDegrad);
1408     yc = rOuter*TMath::Sin(phi3*kDegrad);
1409
1410     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1411
1412     nRotMat++;
1413
1414   }
1415   // TPMW->TPC
1416
1417   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1418   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1419
1420   //---------------------------------------------------------
1421   //  Tpc High Voltage Membrane - 100 microns of mylar
1422   //---------------------------------------------------------
1423
1424   dm[0]=82.8;
1425   dm[1]=252.;
1426   dm[2]=0.005;
1427
1428   gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1429
1430   gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1431
1432   // Tpc High Voltage membrane Holders
1433
1434   gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1435
1436
1437
1438   // inner
1439
1440   dm[0]=79.3;
1441   dm[1]=82.8;
1442   dm[2]=0.2;
1443
1444   gMC->Gsposp("THVH",1,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1445
1446   // outer
1447
1448   dm[0]= 252.;
1449   dm[1]= 257.9;
1450   dm[2]= 0.4;
1451
1452   gMC->Gsposp("THVH",2,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1453
1454   //----------------------------------------------------------
1455   // TPc Support Rods - MAKROLON
1456   //----------------------------------------------------------
1457
1458   dm[0]= 0.9;
1459   dm[1]= 1.2;
1460
1461   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1462
1463
1464   for(Int_t nrod=0;nrod<18;nrod++){
1465     Float_t angle=innerOpenAngle*(Float_t)nrod;
1466
1467     xc=81.5*TMath::Cos(angle);
1468     yc=81.5*TMath::Sin(angle);
1469
1470     dm[2]=126.7;
1471
1472     gMC->Gsposp("TPSR",nrod+1,"TDGS",xc,yc,126.9,0,"ONLY",dm,3);
1473     gMC->Gsposp("TPSR",nrod+19,"TDGS",xc,yc,-126.9,0,"ONLY",dm,3);
1474
1475     dm[2]=126.6;
1476
1477     xc=254.25*TMath::Cos(angle);
1478     yc=254.25*TMath::Sin(angle);
1479
1480     // rod number 54 contans the HV cable
1481
1482     if(nrod<17) {
1483       gMC->Gsposp("TPSR",nrod+37,"TDGS",xc,yc,127.,0,"ONLY",dm,3);
1484       gMC->Gsposp("TPSR",nrod+54,"TDGS",xc,yc,-127.,0,"ONLY",dm,3);
1485     }
1486
1487   }
1488
1489   //----------------------------------------------------------
1490   // Tpc High Voltage Rod - MAKROLON + Copper cable
1491   //----------------------------------------------------------
1492
1493   // rod with cable (Left)
1494
1495   dm[0]=0.;
1496   dm[1]=2.25;
1497   dm[2]=126.6;
1498
1499   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1500
1501   // HV cable
1502
1503   dm[0]=0.;
1504   dm[1]=0.3;
1505   dm[2]=126.6;
1506
1507   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1508
1509   // empty space
1510
1511   dm[0]=0.3;
1512   dm[1]=1.;
1513   dm[2]=126.6;
1514
1515   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1516
1517   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1518   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1519
1520   // rod without cable
1521
1522   dm[0]=1.8;
1523   dm[1]=2.25;
1524   dm[2]=126.6;
1525
1526   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1527
1528   gMC->Gspos("THVL",1,"TDGS",xc,yc,-127.,0,"ONLY");
1529   gMC->Gspos("THVR",1,"TDGS",xc,yc,127.,0,"ONLY");
1530
1531   gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY");
1532
1533   // services wheel cover -> wheel
1534
1535
1536   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1537   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1538
1539
1540   // put the wheel into the TPC
1541
1542   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1543   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1544
1545   //
1546
1547   gMC->Gsord("TPMW",6);
1548   gMC->Gsord("TSSW",6);
1549   gMC->Gsord("TSWC",6);
1550
1551   // put the TPC into ALIC (main mother volume)
1552
1553   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1554
1555
1556 } // end of function
1557
1558 //_____________________________________________________________________________
1559 void AliTPCv3::DrawDetector()
1560 {
1561   //
1562   // Draw a shaded view of the Time Projection Chamber version 3
1563   //
1564
1565
1566   // Set everything unseen
1567   gMC->Gsatt("*", "seen", -1);
1568   //
1569   // Set ALIC mother transparent
1570   gMC->Gsatt("ALIC","SEEN",0);
1571   //
1572   // Set the volumes visible
1573   //
1574
1575   gMC->Gsatt("TPC ","SEEN",0);
1576   gMC->Gsatt("TOIN","SEEN",1);
1577   gMC->Gsatt("TOIN","COLO",7);
1578   gMC->Gsatt("TOCV","SEEN",1);
1579   gMC->Gsatt("TOCV","COLO",4);
1580   gMC->Gsatt("TSA1","SEEN",0);
1581   gMC->Gsatt("TSA2","SEEN",0);
1582   gMC->Gsatt("TSA3","SEEN",0);
1583   gMC->Gsatt("TSA4","SEEN",0);
1584   gMC->Gsatt("TSA5","SEEN",0);
1585   gMC->Gsatt("TOFC","SEEN",1);
1586   gMC->Gsatt("TOFC","COLO",4);
1587   gMC->Gsatt("TSA6","SEEN",0);
1588   gMC->Gsatt("TSA7","SEEN",0);
1589   gMC->Gsatt("TSA8","SEEN",0);
1590   gMC->Gsatt("TIIN","SEEN",1);
1591   gMC->Gsatt("TIIN","COLO",7);
1592   gMC->Gsatt("TII1","SEEN",0);
1593   gMC->Gsatt("TIFC","SEEN",1);
1594   gMC->Gsatt("TIFC","COLO",4);
1595   gMC->Gsatt("TSA9","SEEN",0);
1596   gMC->Gsatt("TS10","SEEN",0);
1597   gMC->Gsatt("TS11","SEEN",0);
1598   gMC->Gsatt("TS12","SEEN",0);
1599   gMC->Gsatt("TS13","SEEN",0);
1600   gMC->Gsatt("TS14","SEEN",0);
1601   gMC->Gsatt("TICC","SEEN",0);
1602   gMC->Gsatt("TICM","SEEN",0);
1603   gMC->Gsatt("TS15","SEEN",0);
1604   gMC->Gsatt("TS16","SEEN",0);
1605   gMC->Gsatt("TS17","SEEN",0);
1606   gMC->Gsatt("TS18","SEEN",0);
1607   gMC->Gsatt("TS19","SEEN",0);
1608   gMC->Gsatt("TPJ1","SEEN",0);
1609   gMC->Gsatt("TPJ2","SEEN",0);
1610   gMC->Gsatt("TICS","SEEN",0);
1611   gMC->Gsatt("TDGS","SEEN",0);
1612   gMC->Gsatt("TIRC","SEEN",0);
1613   gMC->Gsatt("TIC1","SEEN",1);
1614   gMC->Gsatt("TIPP","SEEN",0);
1615   gMC->Gsatt("TIC3","SEEN",0);
1616   gMC->Gsatt("TRCE","SEEN",0);
1617   gMC->Gsatt("TPSC","SEEN",0);
1618   gMC->Gsatt("TPCC","SEEN",0);
1619   gMC->Gsatt("TORC","SEEN",0);
1620   gMC->Gsatt("TOPP","SEEN",0);
1621   gMC->Gsatt("TOC3","SEEN",0);
1622   gMC->Gsatt("TOC1","SEEN",1);
1623   gMC->Gsatt("TSSW","SEEN",1);
1624   gMC->Gsatt("TSWC","SEEN",1);
1625   gMC->Gsatt("TSSW","COLO",3);
1626   gMC->Gsatt("TSWC","COLO",3);
1627   gMC->Gsatt("TSCE","COLO",6);
1628   gMC->Gsatt("TSCE","SEEN",1);
1629   gMC->Gsatt("TWES","SEEN",0);
1630   gMC->Gsatt("TSWB","SEEN",0);
1631   gMC->Gsatt("TPEL","SEEN",0);
1632   gMC->Gsatt("TPMW","SEEN",1);
1633   gMC->Gsatt("TESR","SEEN",1);
1634   gMC->Gsatt("TPMW","COLO",12);
1635   gMC->Gsatt("TIC1","COLO",5);
1636   gMC->Gsatt("TOC1","COLO",5);
1637   gMC->Gsatt("TESB","SEEN",0);
1638   gMC->Gsatt("THVM","SEEN",1);
1639   gMC->Gsatt("THVM","COLO",11);
1640   gMC->Gsatt("THVH","SEEN",0);
1641   gMC->Gsatt("TPSR","SEEN",0);
1642   gMC->Gsatt("THVL","SEEN",0);
1643   gMC->Gsatt("THVC","SEEN",0);
1644   gMC->Gsatt("THVE","SEEN",0);
1645   gMC->Gsatt("THVR","SEEN",0);
1646
1647   //
1648   gMC->Gdopt("hide", "on");
1649   gMC->Gdopt("shad", "on");
1650   gMC->Gsatt("*", "fill", 7);
1651   gMC->SetClipBox(".");
1652   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1653   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1654   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1655   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1656   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1657   gMC->DefaultRange();
1658   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1659   gMC->Gdhead(1111, "Time Projection Chamber");
1660   gMC->Gdman(18, 4, "MAN");
1661   gMC->Gdopt("hide","off");
1662 }
1663
1664 //_____________________________________________________________________________
1665 void AliTPCv3::CreateMaterials()
1666 {
1667   //
1668   // Define materials for version 2 of the Time Projection Chamber
1669   //
1670
1671
1672   //
1673   AliTPC::CreateMaterials();
1674 }
1675
1676 //_____________________________________________________________________________
1677 void AliTPCv3::Init()
1678 {
1679   //
1680   // Initialises version 3 of the TPC after that it has been built
1681   //
1682   Int_t *idtmed = fIdtmed->GetArray();
1683
1684   AliTPC::Init();
1685
1686   fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1687
1688   gMC->SetMaxNStep(30000); // max. number of steps increased
1689
1690   gMC->Gstpar(idtmed[2],"LOSS",5);
1691
1692   printf("*** TPC version 3 initialized ***\n");
1693   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1694
1695   //
1696
1697 }
1698
1699 //_____________________________________________________________________________
1700 void AliTPCv3::StepManager()
1701 {
1702   //
1703   // Called for every step in the Time Projection Chamber
1704   //
1705
1706   //
1707   // parameters used for the energy loss calculations
1708   //
1709   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1710   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1711   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1712
1713
1714   const Float_t kbig = 1.e10;
1715
1716   Int_t id,copy;
1717   TLorentzVector pos;
1718   Float_t hits[4];
1719   Int_t vol[2];
1720
1721   vol[1]=0;
1722   vol[0]=0;
1723
1724   //
1725
1726   gMC->SetMaxStep(kbig);
1727
1728   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1729
1730   Float_t charge = gMC->TrackCharge();
1731
1732   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1733
1734
1735   id=gMC->CurrentVolID(copy);
1736
1737   // Check the sensitive volume
1738
1739   if (id != fIdSens) return;
1740
1741   //
1742   //  charged particle is in the sensitive volume
1743   //
1744
1745   if(gMC->TrackStep() > 0) {
1746
1747
1748     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1749     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1750
1751     gMC->TrackPosition(pos);
1752     hits[0]=pos[0];
1753     hits[1]=pos[1];
1754     hits[2]=pos[2];
1755
1756     //
1757     // check the selected side of the TPC
1758     //
1759
1760     if(fSide && fSide*hits[2]<=0.) return;
1761
1762     hits[3]=(Float_t)nel;
1763
1764     // Add this hit
1765
1766     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
1767
1768   }
1769
1770   // Stemax calculation for the next step
1771
1772   Float_t pp;
1773   TLorentzVector mom;
1774   gMC->TrackMomentum(mom);
1775   Float_t ptot=mom.Rho();
1776   Float_t betaGamma = ptot/gMC->TrackMass();
1777
1778   Int_t pid=gMC->TrackPid();
1779   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1780     {
1781       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1782     }
1783   else
1784     {
1785       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1786       pp=kprim*BetheBloch(betaGamma);
1787       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1788     }
1789
1790   Float_t random[1];
1791   gMC->Rndm(random,1); // good, old GRNDM from Geant3
1792
1793   Double_t rnd = (Double_t)random[0];
1794
1795   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1796
1797 }
1798
1799 //_____________________________________________________________________________
1800 Float_t AliTPCv3::BetheBloch(Float_t bg)
1801 {
1802   //
1803   // Bethe-Bloch energy loss formula
1804   //
1805   const Double_t kp1=0.76176e-1;
1806   const Double_t kp2=10.632;
1807   const Double_t kp3=0.13279e-4;
1808   const Double_t kp4=1.8631;
1809   const Double_t kp5=1.9479;
1810
1811   Double_t dbg = (Double_t) bg;
1812
1813   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1814
1815   Double_t aa = TMath::Power(beta,kp4);
1816   Double_t bb = TMath::Power(1./dbg,kp5);
1817
1818   bb=TMath::Log(kp3+bb);
1819
1820   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1821 }