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 1.24  2001/04/24 11:22:01  kowal2
  19 Protection against too small betagamma
  20
  21 Revision 1.23  2001/04/24 11:17:33  kowal2
  22 New TPC geometry.
  23
  24 Revision 1.22  2001/03/13 13:07:34  kowal2
  25 Corrected bug in the TPC mother volume geometry.
  26 Thanks to A. Morsch
  27
  28 Revision 1.21  2000/11/30 11:48:50  kowal2
  29 TLorentzVector.h adde to satisfy the latest changes by Federico
  30
  31 Revision 1.20  2000/11/14 10:48:57  kowal2
  32 Correct material used for TSA4. Thanks to J. Barbosa.
  33
  34 Revision 1.19  2000/11/06 17:24:10  kowal2
  35 Corrected bug in the outer containment vessel and
  36 the outer field cage geometry.
  37 Thanks to J. Barbosa.
  38
  39 Revision 1.18  2000/11/02 16:55:24  kowal2
  40 Corrected bug in the inner containment vessel geometry.
  41 Thanks to J. Belikov
  42
  43 Revision 1.17  2000/11/02 07:24:11  kowal2
  44 Correction in the TPC geometry.
  45 Changes due to the new hit structure.
  46
  47 Revision 1.16  2000/10/02 21:28:18  fca
  48 Removal of useless dependecies via forward declarations
  49
  50 Revision 1.15  2000/07/10 20:57:39  hristov
  51 Update of TPC code and macros by M.Kowalski
  52
  53 Revision 1.14  2000/06/30 12:07:50  kowal2
  54 Updated from the TPC-PreRelease branch
  55
  56 Revision 1.13.2.4  2000/06/26 07:39:42  kowal2
  57 Changes to obey the coding rules
  58
  59 Revision 1.13.2.3  2000/06/25 08:38:41  kowal2
  60 Splitted from AliTPCtracking
  61
  62 Revision 1.13.2.2  2000/06/16 12:58:13  kowal2
  63 Changed parameter settings
  64
  65 Revision 1.13.2.1  2000/06/09 07:15:07  kowal2
  66
  67 Defaults loaded automatically (hard-wired)
  68 Optional parameters can be set via macro called in the constructor
  69
  70 Revision 1.13  2000/05/15 10:00:30  kowal2
  71 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
  72
  73 Revision 1.12  2000/04/17 09:37:33  kowal2
  74 removed obsolete AliTPCDigitsDisplay.C
  75
  76 Revision 1.11.8.2  2000/04/10 08:36:12  kowal2
  77
  78 Updated readout chambers
  79 Some modifications to StepManager by M. Kowalski
  80
  81 Revision 1.11.8.1  2000/04/10 07:56:53  kowal2
  82 Not used anymore - removed
  83
  84 Revision 1.11  1999/11/04 17:28:07  fca
  85 Correct barrel part of HV Degrader
  86
  87 Revision 1.10  1999/10/14 16:52:08  fca
  88 Only use PDG codes and not GEANT ones
  89
  90 Revision 1.9  1999/10/08 06:27:23  fca
  91 Corrected bug in the HV degrader geometry, thanks to G.Tabary
  92
  93 Revision 1.8  1999/10/04 13:39:55  fca
  94 Correct array index problem
  95
  96 Revision 1.7  1999/09/29 09:24:34  fca
  97 Introduction of the Copyright and cvs Log
  98
  99 */
 100
 101 //
 102 ///////////////////////////////////////////////////////////////////////////////
 103 //                                                                           //
 104 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
 105 //
 106 //Begin_Html
 107 /*
 108 <img src="picts/AliTPCv3Class.gif">
 109 */
 110 //End_Html
 111 //                                                                           //
 112 //                                                                           //
 113 ///////////////////////////////////////////////////////////////////////////////
 114
 115 #include <stdlib.h>
 116 #include <TMath.h>
 117 #include "AliTPCv3.h"
 118 #include "AliRun.h"
 119 #include "AliMC.h"
 120 #include "AliConst.h"
 121 #include "AliTPCDigitsArray.h"
 122 #include"AliTPCParam.h"
 123 #include"AliTPCParamSR.h"
 124 #include "AliPDG.h"
 125 #include <TInterpreter.h>
 126 #include "TLorentzVector.h"
 127 #include "AliTPCTrackHits.h"
 128
 129 ClassImp(AliTPCv3)
 130 //_____________________________________________________________________________
 131
 132   AliTPCv3::AliTPCv3(){
 133
 134   fHitType = 1;
 135
 136 }
 137
 138 //_____________________________________________________________________________
 139 AliTPCv3::AliTPCv3(const char *name, const char *title) :
 140   AliTPC(name, title)
 141 {
 142   //
 143   // Standard constructor for Time Projection Chamber version 3
 144   //
 145
 146   SetBufferSize(128000);
 147   fIdSens=0;
 148
 149   SetGasMixt(2,20,10,-1,0.9,0.1,0.);
 150
 151   if (fTPCParam)
 152      fTPCParam->Write(fTPCParam->GetTitle());
 153
 154   fHitType =1;
 155 }
 156
 157 //_____________________________________________________________________________
 158 void AliTPCv3::CreateGeometry()
 159 {
 160   //
 161   // Creation of the TPC coarse geometry (version 3)
 162   // The whole drift volume is sensitive
 163   // Origin Marek Kowalski Cracow
 164   //
 165   //Begin_Html
 166   /*
 167     <img src="picts/AliTPCgif">
 168   */
 169   //End_Html
 170   //Begin_Html
 171   /*
 172     <img src="picts/AliTPCv3Tree.gif">
 173   */
 174   //End_Html
 175   Float_t dm[50];
 176
 177   Int_t *idtmed = fIdtmed->GetArray(); // TPC media
 178
 179   Int_t idrotm[120]; // rotation matrices
 180
 181   Int_t nRotMat = 0; // actual number of rotation matrices
 182
 183
 184   //
 185   //  Mother volume (Air) - all volumes will be positioned in it
 186   //
 187
 188   dm[0]=0.;
 189   dm[1]=360.;
 190   dm[2]=8.;
 191
 192   //
 193
 194   dm[3]=-283.7;
 195   dm[4]=65.6;
 196   dm[5]=278.;
 197
 198   //
 199
 200   dm[6]=-253.6;
 201   dm[7]=65.6;
 202   dm[8]=278.;
 203
 204   //
 205
 206   dm[9]=-73.3;
 207   dm[10]=60.9;
 208   dm[11]=278.;
 209
 210   //
 211
 212   dm[12]=-73.3;
 213   dm[13]=56.9;
 214   dm[14]=278.;
 215
 216   //
 217
 218   dm[15]=73.3;
 219   dm[16]=56.9;
 220   dm[17]=278.;
 221
 222   //
 223
 224   dm[18]=73.3;
 225   dm[19]=60.9;
 226   dm[20]=278.;
 227
 228   //
 229
 230   dm[21]=253.6;
 231   dm[22]=65.6;
 232   dm[23]=278.;
 233
 234   //
 235
 236   dm[24]=283.7;
 237   dm[25]=65.6;
 238   dm[26]=278.;
 239
 240   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
 241
 242   // outer part
 243
 244   //-------------------------------------------------------------------
 245   //   Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
 246   //-------------------------------------------------------------------
 247
 248   dm[0]= 0.;
 249   dm[1]= 360.;
 250   dm[2]= 6.;
 251
 252   //
 253
 254   dm[3]=-253.6;
 255   dm[4]=258.;
 256   dm[5]=275.5;
 257
 258   //
 259
 260   dm[6]=-250.6;
 261   dm[7]=258.;
 262   dm[8]=275.5;
 263
 264   //
 265
 266   dm[9]=-250.6;
 267   dm[10]=258.;
 268   dm[11]=278.;
 269
 270   //
 271
 272   dm[12]=253.6;
 273   dm[13]=258.;
 274   dm[14]=278.;
 275
 276   //
 277
 278   dm[15]=253.6;
 279   dm[16]=264.8;
 280   dm[17]=278.;
 281
 282   //
 283
 284   dm[18]=256.6;
 285   dm[19]=264.8;
 286   dm[20]=278.;
 287
 288   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 289
 290   //----------------------------------------------------------------
 291   // Tpc Outer Contaiment Vessel
 292   //  mother volume - Al, daughters - composite (sandwich)
 293   //----------------------------------------------------------------
 294
 295   dm[0]=0.;
 296   dm[1]=360.;
 297   dm[2]=6.;
 298
 299   //
 300
 301   dm[3]=-250.6;
 302   dm[4]=270.4;
 303   dm[5]=278.;
 304
 305   //
 306
 307   dm[6]=-247.6;
 308   dm[7]=270.4;
 309   dm[8]=278.;
 310
 311   //
 312
 313   dm[9]=-247.6;
 314   dm[10]=274.81;
 315   dm[11]=278.;
 316
 317   //
 318
 319   dm[12]=253.6;
 320   dm[13]=274.81;
 321   dm[14]=278.;
 322
 323   //
 324
 325   dm[15]=253.6;
 326   dm[16]=264.8;
 327   dm[17]=278.;
 328
 329   //
 330
 331   dm[18]=256.6;
 332   dm[19]=264.8;
 333   dm[20]=278.;
 334
 335   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 336
 337   // Daughter volumes - sandwich
 338
 339   // Tpc SAndwich 1 - Al
 340
 341   dm[0]=274.81;
 342   dm[1]=278.;
 343   dm[2]=252.1;
 344
 345   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 346
 347   // Tpc SAndwich 2 - epoxy glue (I use Lexan)
 348
 349   dm[0] += 5.e-3;
 350   dm[1] -= 5.e-3;
 351
 352   gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
 353
 354   // Tpc SAndwich 3 - Tedlar
 355
 356   dm[0] += 0.01;
 357   dm[1] -= 0.01;
 358
 359   gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
 360
 361
 362   // Tpc SAndwich 4 - fiber glass (G10)
 363
 364   dm[0] += 5.e-3;
 365   dm[1] -= 5.e-3;
 366
 367   gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
 368
 369   // Tpc SAndwich 5 - NOMEX honeycomb
 370
 371   dm[0] += 0.075;
 372   dm[1] -= 0.075;
 373
 374   gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
 375
 376   // 5->4->3->2->1->TCOV
 377
 378
 379   gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
 380   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 381   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 382   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 383
 384   gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
 385
 386   // TCOV-> TOIN
 387
 388   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 389
 390   //-------------------------------------------------------
 391   //  Tpc Outer Field Cage
 392   //  mother volume - Al, daughters - composite (sandwich)
 393   //-------------------------------------------------------
 394
 395   dm[0]=0.;
 396   dm[1]=360.;
 397   dm[2]=6.;
 398
 399   //
 400
 401   dm[3]=-253.6;
 402   dm[4]=258.;
 403   dm[5]=275.5;
 404
 405   //
 406
 407   dm[6]=-250.6;
 408   dm[7]=258.;
 409   dm[8]=275.5;
 410
 411   //
 412
 413   dm[9]=-250.6;
 414   dm[10]=258.;
 415   dm[11]=260.05;
 416
 417   //
 418
 419   dm[12]=250.6;
 420   dm[13]=258.;
 421   dm[14]=260.05;
 422
 423   //
 424
 425   dm[15]=250.6;
 426   dm[16]=258.;
 427   dm[17]=275.5;
 428
 429   //
 430
 431   dm[18]=253.6;
 432   dm[19]=258.;
 433   dm[20]=275.5;
 434
 435   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 436
 437   // Daughter volumes
 438
 439   // Tpc SAndwich 6 - Tedlar
 440
 441   dm[0]= 258.;
 442   dm[1]= 260.05;
 443   dm[2]= 252.1;
 444
 445   gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
 446
 447   // Tpc SAndwich 7 - fiber glass
 448
 449   dm[0] += 5.e-3;
 450   dm[1] -= 5.e-3;
 451
 452   gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
 453
 454
 455   // Tpc SAndwich 8 - NOMEX
 456
 457   dm[0] += 0.02;
 458   dm[1] -= 0.02;
 459
 460   gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
 461
 462   // 8->7->6->TOFC
 463
 464   gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
 465   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 466   gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
 467
 468   // TOFC->TOIN
 469
 470   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 471
 472   // TOIN->TPC
 473
 474   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 475
 476   // inner part
 477
 478   //--------------------------------------------------------------------
 479   // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
 480   // Inner containment vessel will be placed directly in the TPC
 481   //--------------------------------------------------------------------
 482
 483   dm[0]=0.;
 484   dm[1]=360.;
 485   dm[2]=4.;
 486
 487   //
 488
 489   dm[3]=-253.6;
 490   dm[4]=65.9;
 491   dm[5]=79.2;
 492
 493   //
 494
 495   dm[6]=-73.3;
 496   dm[7]=61.2;
 497   dm[8]=79.2;
 498
 499   //
 500
 501   dm[9]=73.3;
 502   dm[10]=61.2;
 503   dm[11]=79.2;
 504
 505   //
 506
 507   dm[12]=253.6;
 508   dm[13]=65.9;
 509   dm[14]=79.2;
 510
 511   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
 512
 513   // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
 514
 515   dm[0]=79.16;
 516   dm[1]=79.2;
 517   dm[2]=88.;
 518
 519   gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
 520
 521   gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
 522
 523   //-----------------------------------------------------
 524   // Tpc Inner Field Cage
 525   // mother volume - Al, daughters - composite (sandwich)
 526   //------------------------------------------------------
 527
 528   dm[0]=0.;
 529   dm[1]=360.;
 530   dm[2]=10.;
 531
 532   //
 533
 534   dm[3]=-253.6;
 535   dm[4]=70.3;
 536   dm[5]=79.2;
 537
 538   //
 539
 540   dm[6]=-250.6;
 541   dm[7]=70.3;
 542   dm[8]=79.2;
 543
 544   //
 545
 546   dm[9]=-250.6;
 547   dm[10]=77.05;
 548   dm[11]=79.2;
 549
 550   //
 551
 552   dm[12]=-88.;
 553   dm[13]=77.05;
 554   dm[14]=79.2;
 555
 556   //
 557
 558   dm[15]=-88.;
 559   dm[16]=77.09;
 560   dm[17]=79.16;
 561
 562   //
 563
 564   dm[18]=88.;
 565   dm[19]=77.09;
 566   dm[20]=79.16;
 567
 568   //
 569
 570   dm[21]=88.;
 571   dm[22]=77.05;
 572   dm[23]=79.2;
 573
 574   //
 575
 576   dm[24]=250.6;
 577   dm[25]=77.05;
 578   dm[26]=79.2;
 579
 580   //
 581
 582   dm[27]=250.6;
 583   dm[28]=70.3;
 584   dm[29]=79.2;
 585
 586   //
 587
 588   dm[30]=253.6;
 589   dm[31]=70.3;
 590   dm[32]=79.2;
 591
 592   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
 593
 594   // daughter volumes - central part
 595
 596   // Tpc Sandwich 9 -Tedlar
 597
 598   dm[0]=77.09;
 599   dm[1]=79.16;
 600   dm[2]=88.;
 601
 602   gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
 603
 604   // Tpc Sandwich 10 - fiber glass (G10)
 605
 606   dm[0] += 5.e-3;
 607   dm[1] -= 5.e-3;
 608
 609   gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
 610
 611   // Tpc Sandwich 11 - NOMEX
 612
 613   dm[0] += 0.03;
 614   dm[1] -= 0.03;
 615
 616   gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
 617
 618   // 11->10->9->TIFC
 619
 620   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 621   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 622
 623   gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
 624
 625   // daughter volumes - outer parts (reinforced)
 626
 627   // Tpc Sandwich 12 -Tedlar
 628
 629   dm[0]=77.05;
 630   dm[1]=79.2;
 631   dm[2]=82.05;
 632
 633   gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
 634
 635   // Tpc Sandwich 13 - fiber glass (G10)
 636
 637   dm[0] += 5.e-3;
 638   dm[1] -= 5.e-3;
 639
 640   gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
 641
 642   // Tpc Sandwich 14 - NOMEX
 643
 644   dm[0] += 0.07;
 645   dm[1] -= 0.07;
 646
 647   gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
 648
 649   // 14->13->12->TIFC
 650
 651   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 652   gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
 653
 654   gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
 655   gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
 656
 657   // place this inside the inner insulator
 658
 659   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
 660
 661   // and now in the TPC...
 662
 663   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 664
 665   //---------------------------------------------------------
 666   // Tpc Inner Containment vessel - Cones
 667   //---------------------------------------------------------
 668
 669   dm[0]=0.;
 670   dm[1]=360.;
 671   dm[2]=8.;
 672
 673   //
 674
 675   dm[3]=71.8;
 676   dm[4]=56.9;
 677   dm[5]=59.4;
 678
 679   //
 680
 681   dm[6]=73.;
 682   dm[7]=56.9;
 683   dm[8]=59.4;
 684
 685   //
 686
 687   dm[9]=73.;
 688   dm[10]=56.9;
 689   dm[11]=61.2;
 690
 691   //
 692
 693   dm[12]=73.3;
 694   dm[13]=56.9;
 695   dm[14]=61.2;
 696
 697   //
 698
 699   dm[15]=73.3;
 700   dm[16]=60.9;
 701   dm[17]=61.2;
 702
 703   //
 704
 705   dm[18]=253.6;
 706   dm[19]=65.6;
 707   dm[20]=65.9;
 708
 709   //
 710
 711   dm[21]=253.6;
 712   dm[22]=65.6;
 713   dm[23]=74.6;
 714
 715   //
 716
 717   dm[24]=256.6;
 718   dm[25]=65.6;
 719   dm[26]=74.6;
 720
 721   gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
 722
 723   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
 724
 725   // reflection matrix
 726
 727   theta1 = 90.;
 728   phi1   = 0.;
 729   theta2 = 90.;
 730   phi2   = 270.;
 731   theta3 = 180.;
 732   phi3   = 0.;
 733
 734   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 735
 736   gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
 737   gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 738
 739
 740   //---------------------------------------------------------
 741   // Tpc Inner Containment vessel - Middle part -Al
 742   //---------------------------------------------------------
 743
 744   dm[0]=0.;
 745   dm[1]=360.;
 746   dm[2]=6.;
 747
 748   //
 749
 750   dm[3]=-71.6;
 751   dm[4]=60.2;
 752   dm[5]=61.2;
 753
 754   //
 755
 756   dm[6]=-69.1;
 757   dm[7]=60.2;
 758   dm[8]=61.2;
 759
 760   //
 761
 762   dm[9]=-69.1;
 763   dm[10]=60.64;
 764   dm[11]=61.2;
 765
 766   //
 767
 768   dm[12]=69.1;
 769   dm[13]=60.64;
 770   dm[14]=61.2;
 771
 772   //
 773
 774   dm[15]=69.1;
 775   dm[16]=60.2;
 776   dm[17]=61.2;
 777
 778   //
 779
 780   dm[18]=71.6;
 781   dm[19]=60.2;
 782   dm[20]=61.2;
 783
 784   gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
 785
 786   // Tpc Sandwich 15 - Al
 787
 788   dm[0]=60.64;
 789   dm[1]=61.2;
 790   dm[2]=70.1;
 791
 792   gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
 793
 794   // Tpc Sandwich 16 -  epoxy glue
 795
 796   dm[0] += 5.e-3;
 797   dm[1] -= 5.e-3;
 798
 799   gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
 800
 801   // Tpc Sandwich 17 - Tedlar
 802
 803   dm[0] += 0.01;
 804   dm[1] -= 0.01;
 805
 806   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 807
 808   // Tpc Sandwich 18 - fiber glass
 809
 810   dm[0] += 5.e-3;
 811   dm[1] -= 5.e-3;
 812
 813   gMC->Gsvolu("TS18","TUBE",idtmed[12],dm,3);
 814
 815   // Tpc Sandwich 19 - Nomex
 816
 817   dm[0] += 0.01;
 818   dm[1] -= 0.01;
 819
 820   gMC->Gsvolu("TS19","TUBE",idtmed[12],dm,3);
 821
 822   // 19->18->17->16->15-> TICM
 823
 824   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
 825   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
 826   gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
 827   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 828
 829   gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
 830
 831
 832   // TPc inner cont. vessel Joints
 833
 834   dm[0]=60.2;
 835   dm[1]=61.2;
 836   dm[2]=0.5;
 837
 838   gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
 839
 840   gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
 841   gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
 842
 843   //
 844
 845   dm[0]=0.;
 846   dm[1]=360.;
 847   dm[2]=4.;
 848
 849   //
 850
 851   dm[3]=70.8;
 852   dm[4]=58.4;
 853   dm[5]=60.1;
 854
 855   //
 856
 857   dm[6]=71.2;
 858   dm[7]=58.4;
 859   dm[8]=60.1;
 860
 861   //
 862
 863   dm[9]=71.2;
 864   dm[10]=58.4;
 865   dm[11]=59.4;
 866
 867   //
 868
 869   dm[12]=71.6;
 870   dm[13]=58.4;
 871   dm[14]=59.4;
 872
 873   gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
 874
 875   gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
 876   gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 877
 878
 879
 880   // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
 881
 882   dm[0]=58.4;
 883   dm[1]=61.2;
 884   dm[2]=0.1;
 885
 886   gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
 887
 888   gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
 889   gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
 890
 891   // TICM -> TPC
 892
 893   gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
 894
 895   //
 896
 897   nRotMat++; // prepare for the next rotation matrix
 898
 899   //---------------------------------------------------------
 900   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
 901   //  and its daughters (HV membrane, rods, readout chambers)
 902   //---------------------------------------------------------
 903
 904   dm[0]= 79.2;
 905   dm[1]= 258.0;
 906   dm[2]= 253.6;
 907
 908   gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);
 909
 910   // sector opening angles
 911
 912   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
 913
 914   // sector angle shift
 915
 916   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
 917
 918   // number of sectors
 919
 920   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 921   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 922
 923   // All above parameters are identical for inner and outer
 924   // sectors. The distinction is kept for the historical reasons
 925   // and eventually will disappear.
 926
 927   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
 928   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
 929   Float_t space;
 930
 931   //-------------------------------------------------------------------------
 932   //   Tpc Inner Readout Chambers
 933   //-------------------------------------------------------------------------
 934
 935   dm[0]= 14.483;
 936   dm[1]= 23.3345;
 937   dm[2]= 1.6; // thickness
 938   dm[3]= 25.1;
 939
 940   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
 941
 942   // this volume will be positioned in the empty space
 943   // of the end-cap to avoid overlaps
 944
 945   dm[0]= 13.7305;
 946   dm[1]= 21.1895;
 947   dm[2]= 2.25;
 948   dm[3]= 21.15;
 949
 950   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
 951
 952
 953   //------------------------------------------------
 954   // Tpc Inner readout chamber Pad Plane
 955   //------------------------------------------------
 956
 957   dm[0]= 14.483;
 958   dm[1]= 23.3345;
 959   dm[2]= 0.5;
 960   dm[3]= 25.1;
 961
 962   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
 963
 964   //
 965
 966   dm[0] -= 1.218511934;
 967   dm[1] -= 1.218511934;
 968   dm[2] = 0.35;
 969
 970   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
 971
 972   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
 973
 974   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
 975
 976
 977   //----------------------------------------------
 978   // Tpc Readout Chambers Empty spaces - for both
 979   // inner and outer sectors
 980   //----------------------------------------------
 981
 982   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
 983
 984   // Inner sector - 4 spaces
 985
 986
 987   dm[3] = 4.7625;
 988   dm[0] = 12.472;
 989
 990   Float_t rr = 90.52;
 991   Float_t zz;
 992
 993   zz= -12.7875;
 994
 995   space = rr*tanAlpha-dm[0];
 996
 997   for(Int_t nsLow=0;nsLow<4;nsLow++){
 998
 999     rr += 9.525;
1000     dm[1]= rr*tanAlpha - space;
1001
1002     dm[2]=0.8;
1003
1004     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1005
1006     //
1007
1008     dm[2] = 1.2;
1009
1010     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1011
1012     rr += 0.4;
1013     dm[0] = rr*tanAlpha - space;
1014     zz += (0.4+9.525);
1015
1016   }
1017
1018   dm[0]= 12.472;
1019   // dm[1] - this is the dm[1] from the previous TRCE
1020   dm[2]= 1.05;
1021   dm[3]= 19.65;
1022
1023   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1024
1025   //
1026   // TPc Space for Connectors
1027   //
1028
1029   dm[0]= .3;
1030   dm[1]= .3;
1031   dm[2]= 4.5;
1032
1033   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1034
1035   // TPC Connectors
1036
1037   dm[0]= .25;
1038   dm[1]= .15;
1039   dm[2]= 3.75;
1040
1041   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1042
1043   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1044
1045   zz = -12.7875;
1046
1047
1048   Float_t alpha;
1049   Float_t astep;
1050
1051   // inner part of the inner sector - 2 x 20 holes
1052
1053   astep = 20.00096874/19.;
1054
1055   alpha = 10.00048437-astep;
1056
1057   Float_t x1,x2;
1058
1059     x1 = 13.31175725;
1060     x1 -= 0.996357832;
1061
1062     x2 = 15.06180253;
1063     x2 -= 1.163028812;
1064
1065   Int_t ncon;
1066
1067   for(ncon=0;ncon<20;ncon++){
1068
1069     phi1 = 0.;
1070     theta1 = 90.+alpha;
1071     phi2=90.;
1072     theta2 = 90.;
1073     phi3 = (alpha>0) ? 0. : 180.;
1074     theta3 = TMath::Abs(alpha);
1075
1076     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1077
1078
1079
1080     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1081     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1082
1083
1084     x1 -= 1.296357833;
1085     x2 -= 1.463028812;
1086
1087     alpha -= astep;
1088     nRotMat++;
1089
1090   }
1091
1092   // outer part of the inner sector - 2 x 25 holes
1093
1094    astep = 20.00096874/24.;
1095    alpha = 10.00048437-astep;
1096
1097    x1 = 16.81184781;
1098    x1 -= 1.016295986;
1099
1100    x2 = 18.5618931;
1101    x2 -= 1.150914854;
1102
1103   for(ncon=0;ncon<25;ncon++){
1104
1105     phi1 = 0.;
1106     theta1 = 90.+alpha;
1107     phi2=90.;
1108     theta2 = 90.;
1109     phi3 = (alpha>0) ? 0. : 180.;
1110     theta3 = TMath::Abs(alpha);
1111
1112     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1113
1114
1115
1116     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1117     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1118
1119
1120     x1 -= 1.316295986;
1121     x2 -= 1.450914854;
1122
1123     alpha -= astep;
1124     nRotMat++;
1125
1126   }
1127
1128   //--------------------------------------------------------------------------
1129   //  TPC Outer Readout Chambers
1130   //  this is NOT a final design
1131   //--------------------------------------------------------------------------
1132
1133   dm[0]= 23.3875;
1134   dm[1]= 43.524;
1135   dm[2]= 1.5; //thickness
1136   dm[3]= 57.1;
1137
1138   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1139
1140   //------------------------------------------------
1141   // Tpc Outer readout chamber Pad Plane
1142   //------------------------------------------------
1143
1144   dm[2]= 0.5;
1145
1146   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1147
1148   dm[0] -= 1.218511934;
1149   dm[1] -= 1.218511934;
1150   dm[2] = 0.35;
1151
1152   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1153
1154   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1155
1156   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1157
1158   // empty space
1159
1160   dm[0]= 21.035;
1161   dm[1]= 38.7205;
1162   dm[2]= 0.7;
1163   dm[3]= 50.15;
1164
1165   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1166
1167   dm[0]= 22.2935;
1168   dm[1]= 40.5085;
1169   dm[2]= 2.25;
1170   dm[3]= 51.65;
1171
1172   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1173
1174   dm[0]= 21.35;
1175   dm[1]= 38.7205;
1176   dm[2]= 2.25;
1177   dm[3]= 50.15;
1178
1179   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1180
1181   //-----------------------------------------------
1182   // Tpc Services Support Wheel
1183   //-----------------------------------------------
1184
1185   dm[0]=0.;
1186   dm[1]=360.;
1187   dm[2]=18.;
1188   dm[3]=2.;
1189
1190   dm[4]= -5.;
1191   dm[5]= 77.017;
1192   dm[6]= 255.267;
1193
1194   dm[7]= 5.;
1195   dm[8]= dm[5];
1196   dm[9]= dm[6];
1197
1198   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1199
1200   // Tpc Services Wheel Cover
1201
1202   dm[4]= -0.5;
1203   dm[7]= 0.5;
1204
1205   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1206
1207   // Tpc Service wheel Cover Empty space
1208
1209   dm[0]= 10.99;
1210   dm[1]= 39.599;
1211   dm[2]= .5;
1212   dm[3]= 81.125;
1213
1214   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1215
1216   // Tpc services Wheel Empty Spaces
1217
1218   dm[0]= 13.18017507;
1219   dm[1]= 44.61045938;
1220   dm[2]= 4.;
1221   dm[3]= 89.125;
1222
1223   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1224
1225   // Tpc Services Wheel Bars
1226
1227   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1228
1229   // bars-> TWES
1230
1231   dm[2]= 4.;
1232   dm[3]= .4;
1233
1234   dm[0]= 13.8149522;
1235   dm[1]= 13.95601379;
1236
1237   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1238
1239   dm[0]= 43.83462067;
1240   dm[1]= 43.97568225;
1241
1242   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1243
1244   // TPc ELectronics - right now 30% X0 Si
1245
1246   dm[0]= 14.03813696;
1247   dm[1]= 43.3524075;
1248   dm[2]= 1.404;
1249   dm[3]= 83.125;
1250
1251   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1252   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1253
1254   //--------------------------------------------------------------------------
1255   //  End caps
1256   //--------------------------------------------------------------------------
1257
1258   // TPc Main Wheel - Al
1259
1260   dm[0]= 74.9;
1261   dm[1]= 264.4;
1262   dm[2]= 3.0;
1263
1264   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1265
1266   //--------------------------------------------------------------------------
1267   //  Tpc Empty Space for the Readout chambers
1268   //--------------------------------------------------------------------------
1269
1270   Float_t rLow= 86.2;
1271   Float_t rUp= 243.5;
1272   Float_t dR = 0.5*(rUp-rLow);
1273
1274   space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1275
1276   dm[0]= rLow*tanAlpha-space;
1277   dm[1]= rUp*tanAlpha-space;
1278   dm[2] = 3.0;
1279   dm[3]= dR;
1280
1281   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1282
1283   // TIC1->TESR
1284
1285   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1286
1287   // TOC1->TESR
1288
1289   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1290
1291   // Tpc Empty Space Bars - Al (daughters of TESR)
1292
1293   Float_t zBar;
1294
1295   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1296
1297   // lower bar
1298
1299   dm[0]= rLow*tanAlpha-space;
1300   dm[1]= 88.7*tanAlpha-space;
1301   dm[2]= 2.25;
1302   dm[3]= 1.275;
1303
1304   zBar = -dR+dm[3];
1305
1306   gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1307
1308   // middle bar
1309
1310   dm[0]= 131.65*tanAlpha-space;
1311   dm[1]= 136.5*tanAlpha-space;
1312   dm[3]= 2.425;
1313
1314   zBar = -dR +131.65+dm[3]-rLow;
1315
1316   gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1317
1318   // upper bar
1319
1320   dm[0]= 240.4*tanAlpha-space;
1321   dm[1]= rUp*tanAlpha-space;
1322   dm[3]= 1.55;
1323
1324   zBar = dR-dm[3];
1325
1326   gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1327
1328   //  positioning of the empty spaces into the main wheel
1329
1330   Float_t rCenter,xc,yc;
1331   Float_t rInner,rOuter; // center of the inner and outer chamber
1332
1333   rCenter = rLow+dR;
1334
1335   rInner = 108.07;
1336   rOuter = 190.68;
1337
1338
1339   for(Int_t ns=0; ns<nInnerSector;ns++){
1340
1341     phi1 = ns * innerOpenAngle + innerAngleShift;
1342     phi1 *= kRaddeg; // in degrees
1343
1344     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1345
1346     if (phi1 > 360.) phi1 -= 360.;
1347
1348     theta1 = 90.;
1349     phi2   = 90.;
1350     theta2 = 180.;
1351     phi3   = ns * innerOpenAngle + innerAngleShift;
1352     phi3 *= kRaddeg; // in degrees
1353
1354     phi3 = (Float_t)TMath::Nint(phi3);
1355
1356     if(phi3 > 360.) phi3 -= 360.;
1357
1358     theta3 = 90.;
1359
1360     // "holes"->End plate
1361
1362     xc = rCenter*TMath::Cos(phi3*kDegrad);
1363     yc = rCenter*TMath::Sin(phi3*kDegrad);
1364
1365     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1366
1367     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1368
1369     // TSCE->TSWC (services wheel volumes)
1370
1371     xc = 166.142*TMath::Cos(phi3*kDegrad);
1372     yc = 166.142*TMath::Sin(phi3*kDegrad);
1373
1374     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1375     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1376
1377
1378     // readout chambers->TDGS (drift gas)
1379
1380     xc = rInner*TMath::Cos(phi3*kDegrad);
1381     yc = rInner*TMath::Sin(phi3*kDegrad);
1382
1383     gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1384
1385     xc = rOuter*TMath::Cos(phi3*kDegrad);
1386     yc = rOuter*TMath::Sin(phi3*kDegrad);
1387
1388     gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1389
1390     nRotMat++;
1391
1392     theta2 = 0.; // reflection
1393
1394     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1395
1396     xc = rInner*TMath::Cos(phi3*kDegrad);
1397     yc = rInner*TMath::Sin(phi3*kDegrad);
1398
1399     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1400
1401     xc = rOuter*TMath::Cos(phi3*kDegrad);
1402     yc = rOuter*TMath::Sin(phi3*kDegrad);
1403
1404     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1405
1406     nRotMat++;
1407
1408   }
1409   // TPMW->TPC
1410
1411   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1412   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1413
1414   //---------------------------------------------------------
1415   //  Tpc High Voltage Membrane - 100 microns of mylar
1416   //---------------------------------------------------------
1417
1418   dm[0]=82.8;
1419   dm[1]=252.;
1420   dm[2]=0.005;
1421
1422   gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1423
1424   gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1425
1426   // Tpc High Voltage membrane Holders
1427
1428   gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1429
1430
1431
1432   // inner
1433
1434   dm[0]=79.3;
1435   dm[1]=82.8;
1436   dm[2]=0.2;
1437
1438   gMC->Gsposp("THVH",1,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1439
1440   // outer
1441
1442   dm[0]= 252.;
1443   dm[1]= 257.9;
1444   dm[2]= 0.4;
1445
1446   gMC->Gsposp("THVH",2,"TDGS",0.,0.,0.,0,"ONLY",dm,3);
1447
1448   //----------------------------------------------------------
1449   // TPc Support Rods - MAKROLON
1450   //----------------------------------------------------------
1451
1452   dm[0]= 0.9;
1453   dm[1]= 1.2;
1454
1455   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1456
1457
1458   for(Int_t nrod=0;nrod<18;nrod++){
1459     Float_t angle=innerOpenAngle*(Float_t)nrod;
1460
1461     xc=81.5*TMath::Cos(angle);
1462     yc=81.5*TMath::Sin(angle);
1463
1464     dm[2]=126.7;
1465
1466     gMC->Gsposp("TPSR",nrod+1,"TDGS",xc,yc,126.9,0,"ONLY",dm,3);
1467     gMC->Gsposp("TPSR",nrod+19,"TDGS",xc,yc,-126.9,0,"ONLY",dm,3);
1468
1469     dm[2]=126.6;
1470
1471     xc=254.25*TMath::Cos(angle);
1472     yc=254.25*TMath::Sin(angle);
1473
1474     // rod number 54 contans the HV cable
1475
1476     if(nrod<17) {
1477       gMC->Gsposp("TPSR",nrod+37,"TDGS",xc,yc,127.,0,"ONLY",dm,3);
1478       gMC->Gsposp("TPSR",nrod+54,"TDGS",xc,yc,-127.,0,"ONLY",dm,3);
1479     }
1480
1481   }
1482
1483   //----------------------------------------------------------
1484   // Tpc High Voltage Rod - MAKROLON + Copper cable
1485   //----------------------------------------------------------
1486
1487   // rod with cable (Left)
1488
1489   dm[0]=0.;
1490   dm[1]=2.25;
1491   dm[2]=126.6;
1492
1493   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1494
1495   // HV cable
1496
1497   dm[0]=0.;
1498   dm[1]=0.3;
1499   dm[2]=126.6;
1500
1501   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1502
1503   // empty space
1504
1505   dm[0]=0.3;
1506   dm[1]=1.;
1507   dm[2]=126.6;
1508
1509   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1510
1511   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1512   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1513
1514   // rod without cable
1515
1516   dm[0]=1.8;
1517   dm[1]=2.25;
1518   dm[2]=126.6;
1519
1520   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1521
1522   gMC->Gspos("THVL",1,"TDGS",xc,yc,-127.,0,"ONLY");
1523   gMC->Gspos("THVR",1,"TDGS",xc,yc,127.,0,"ONLY");
1524
1525   gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY");
1526
1527   // services wheel cover -> wheel
1528
1529
1530   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1531   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1532
1533
1534   // put the wheel into the TPC
1535
1536   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1537   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1538
1539   //
1540
1541   gMC->Gsord("TPMW",6);
1542   gMC->Gsord("TSSW",6);
1543   gMC->Gsord("TSWC",6);
1544
1545   // put the TPC into ALIC (main mother volume)
1546
1547   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1548
1549
1550 } // end of function
1551
1552 //_____________________________________________________________________________
1553 void AliTPCv3::DrawDetector()
1554 {
1555   //
1556   // Draw a shaded view of the Time Projection Chamber version 3
1557   //
1558
1559
1560   // Set everything unseen
1561   gMC->Gsatt("*", "seen", -1);
1562   //
1563   // Set ALIC mother transparent
1564   gMC->Gsatt("ALIC","SEEN",0);
1565   //
1566   // Set the volumes visible
1567   //
1568
1569   gMC->Gsatt("TPC ","SEEN",0);
1570   gMC->Gsatt("TOIN","SEEN",1);
1571   gMC->Gsatt("TOIN","COLO",7);
1572   gMC->Gsatt("TOCV","SEEN",1);
1573   gMC->Gsatt("TOCV","COLO",4);
1574   gMC->Gsatt("TSA1","SEEN",0);
1575   gMC->Gsatt("TSA2","SEEN",0);
1576   gMC->Gsatt("TSA3","SEEN",0);
1577   gMC->Gsatt("TSA4","SEEN",0);
1578   gMC->Gsatt("TSA5","SEEN",0);
1579   gMC->Gsatt("TOFC","SEEN",1);
1580   gMC->Gsatt("TOFC","COLO",4);
1581   gMC->Gsatt("TSA6","SEEN",0);
1582   gMC->Gsatt("TSA7","SEEN",0);
1583   gMC->Gsatt("TSA8","SEEN",0);
1584   gMC->Gsatt("TIIN","SEEN",1);
1585   gMC->Gsatt("TIIN","COLO",7);
1586   gMC->Gsatt("TII1","SEEN",0);
1587   gMC->Gsatt("TIFC","SEEN",1);
1588   gMC->Gsatt("TIFC","COLO",4);
1589   gMC->Gsatt("TSA9","SEEN",0);
1590   gMC->Gsatt("TS10","SEEN",0);
1591   gMC->Gsatt("TS11","SEEN",0);
1592   gMC->Gsatt("TS12","SEEN",0);
1593   gMC->Gsatt("TS13","SEEN",0);
1594   gMC->Gsatt("TS14","SEEN",0);
1595   gMC->Gsatt("TICC","SEEN",0);
1596   gMC->Gsatt("TICM","SEEN",0);
1597   gMC->Gsatt("TS15","SEEN",0);
1598   gMC->Gsatt("TS16","SEEN",0);
1599   gMC->Gsatt("TS17","SEEN",0);
1600   gMC->Gsatt("TS18","SEEN",0);
1601   gMC->Gsatt("TS19","SEEN",0);
1602   gMC->Gsatt("TPJ1","SEEN",0);
1603   gMC->Gsatt("TPJ2","SEEN",0);
1604   gMC->Gsatt("TICS","SEEN",0);
1605   gMC->Gsatt("TDGS","SEEN",0);
1606   gMC->Gsatt("TIRC","SEEN",0);
1607   gMC->Gsatt("TIC1","SEEN",1);
1608   gMC->Gsatt("TIPP","SEEN",0);
1609   gMC->Gsatt("TIC3","SEEN",0);
1610   gMC->Gsatt("TRCE","SEEN",0);
1611   gMC->Gsatt("TPSC","SEEN",0);
1612   gMC->Gsatt("TPCC","SEEN",0);
1613   gMC->Gsatt("TORC","SEEN",0);
1614   gMC->Gsatt("TOPP","SEEN",0);
1615   gMC->Gsatt("TOC3","SEEN",0);
1616   gMC->Gsatt("TOC1","SEEN",1);
1617   gMC->Gsatt("TSSW","SEEN",1);
1618   gMC->Gsatt("TSWC","SEEN",1);
1619   gMC->Gsatt("TSSW","COLO",3);
1620   gMC->Gsatt("TSWC","COLO",3);
1621   gMC->Gsatt("TSCE","COLO",6);
1622   gMC->Gsatt("TSCE","SEEN",1);
1623   gMC->Gsatt("TWES","SEEN",0);
1624   gMC->Gsatt("TSWB","SEEN",0);
1625   gMC->Gsatt("TPEL","SEEN",0);
1626   gMC->Gsatt("TPMW","SEEN",1);
1627   gMC->Gsatt("TESR","SEEN",1);
1628   gMC->Gsatt("TPMW","COLO",12);
1629   gMC->Gsatt("TIC1","COLO",5);
1630   gMC->Gsatt("TOC1","COLO",5);
1631   gMC->Gsatt("TESB","SEEN",0);
1632   gMC->Gsatt("THVM","SEEN",1);
1633   gMC->Gsatt("THVM","COLO",11);
1634   gMC->Gsatt("THVH","SEEN",0);
1635   gMC->Gsatt("TPSR","SEEN",0);
1636   gMC->Gsatt("THVL","SEEN",0);
1637   gMC->Gsatt("THVC","SEEN",0);
1638   gMC->Gsatt("THVE","SEEN",0);
1639   gMC->Gsatt("THVR","SEEN",0);
1640
1641   //
1642   gMC->Gdopt("hide", "on");
1643   gMC->Gdopt("shad", "on");
1644   gMC->Gsatt("*", "fill", 7);
1645   gMC->SetClipBox(".");
1646   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1647   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1648   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1649   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1650   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1651   gMC->DefaultRange();
1652   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1653   gMC->Gdhead(1111, "Time Projection Chamber");
1654   gMC->Gdman(18, 4, "MAN");
1655   gMC->Gdopt("hide","off");
1656 }
1657
1658 //_____________________________________________________________________________
1659 void AliTPCv3::CreateMaterials()
1660 {
1661   //
1662   // Define materials for version 2 of the Time Projection Chamber
1663   //
1664
1665
1666   //
1667   AliTPC::CreateMaterials();
1668 }
1669
1670 //_____________________________________________________________________________
1671 void AliTPCv3::Init()
1672 {
1673   //
1674   // Initialises version 3 of the TPC after that it has been built
1675   //
1676   Int_t *idtmed = fIdtmed->GetArray();
1677
1678   AliTPC::Init();
1679
1680   fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1681
1682   gMC->SetMaxNStep(30000); // max. number of steps increased
1683
1684   gMC->Gstpar(idtmed[2],"LOSS",5);
1685
1686   printf("*** TPC version 3 initialized ***\n");
1687   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1688
1689   //
1690
1691 }
1692
1693 //_____________________________________________________________________________
1694 void AliTPCv3::StepManager()
1695 {
1696   //
1697   // Called for every step in the Time Projection Chamber
1698   //
1699
1700   //
1701   // parameters used for the energy loss calculations
1702   //
1703   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1704   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1705   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1706
1707
1708   const Float_t kbig = 1.e10;
1709
1710   Int_t id,copy;
1711   TLorentzVector pos;
1712   Float_t hits[4];
1713   Int_t vol[2];
1714
1715   vol[1]=0;
1716   vol[0]=0;
1717
1718   //
1719
1720   gMC->SetMaxStep(kbig);
1721
1722   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1723
1724   Float_t charge = gMC->TrackCharge();
1725
1726   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1727
1728
1729   id=gMC->CurrentVolID(copy);
1730
1731   // Check the sensitive volume
1732
1733   if (id != fIdSens) return;
1734
1735   //
1736   //  charged particle is in the sensitive volume
1737   //
1738
1739   if(gMC->TrackStep() > 0) {
1740
1741
1742     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1743     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1744
1745     gMC->TrackPosition(pos);
1746     hits[0]=pos[0];
1747     hits[1]=pos[1];
1748     hits[2]=pos[2];
1749
1750     //
1751     // check the selected side of the TPC
1752     //
1753
1754     if(fSide && fSide*hits[2]<=0.) return;
1755
1756     hits[3]=(Float_t)nel;
1757
1758     // Add this hit
1759
1760     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
1761
1762   }
1763
1764   // Stemax calculation for the next step
1765
1766   Float_t pp;
1767   TLorentzVector mom;
1768   gMC->TrackMomentum(mom);
1769   Float_t ptot=mom.Rho();
1770   Float_t betaGamma = ptot/gMC->TrackMass();
1771
1772   Int_t pid=gMC->TrackPid();
1773   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1774     {
1775       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1776     }
1777   else
1778     {
1779       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1780       pp=kprim*BetheBloch(betaGamma);
1781       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1782     }
1783
1784   Float_t random[1];
1785   gMC->Rndm(random,1); // good, old GRNDM from Geant3
1786
1787   Double_t rnd = (Double_t)random[0];
1788
1789   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1790
1791 }
1792
1793 //_____________________________________________________________________________
1794 Float_t AliTPCv3::BetheBloch(Float_t bg)
1795 {
1796   //
1797   // Bethe-Bloch energy loss formula
1798   //
1799   const Double_t kp1=0.76176e-1;
1800   const Double_t kp2=10.632;
1801   const Double_t kp3=0.13279e-4;
1802   const Double_t kp4=1.8631;
1803   const Double_t kp5=1.9479;
1804
1805   Double_t dbg = (Double_t) bg;
1806
1807   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1808
1809   Double_t aa = TMath::Power(beta,kp4);
1810   Double_t bb = TMath::Power(1./dbg,kp5);
1811
1812   bb=TMath::Log(kp3+bb);
1813
1814   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1815 }