TPC/AliTPCv2.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /*
  17 $Log$
  18 Revision 1.39  2001/05/16 14:57:25  alibrary
  19 New files for folders and Stack
  20
  21 Revision 1.38  2001/05/08 16:03:06  kowal2
  22 Geometry update according to the latest technical spec.
  23
  24 Revision 1.37  2001/04/27 15:23:07  kowal2
  25 Correct materian in the central part of the inner containment vessel
  26
  27 Revision 1.36  2001/04/26 06:15:12  kowal2
  28 Corrected bug in the inner containment vessel (cones)
  29
  30 Revision 1.35  2001/04/24 11:17:33  kowal2
  31 New TPC geometry.
  32
  33 Revision 1.34  2001/04/23 10:20:18  hristov
  34 Constant casted to avoid ambiguity
  35
  36 Revision 1.33  2001/04/20 08:16:47  kowal2
  37 Protection against too small betaGamma. Thanks to Ivana and Yves.
  38
  39 Revision 1.32  2001/03/13 13:07:34  kowal2
  40 Corrected bug in the TPC mother volume geometry.
  41 Thanks to A. Morsch
  42
  43 Revision 1.31  2000/11/30 11:48:50  kowal2
  44 TLorentzVector.h adde to satisfy the latest changes by Federico
  45
  46 Revision 1.30  2000/11/14 10:48:57  kowal2
  47 Correct material used for TSA4. Thanks to J. Barbosa.
  48
  49 Revision 1.29  2000/11/06 17:24:10  kowal2
  50 Corrected bug in the outer containment vessel and
  51 the outer field cage geometry.
  52 Thanks to J. Barbosa.
  53
  54 Revision 1.28  2000/11/02 16:55:24  kowal2
  55 Corrected bug in the inner containment vessel geometry.
  56 Thanks to J. Belikov
  57
  58 Revision 1.27  2000/11/02 07:24:11  kowal2
  59 Correction in the TPC geometry.
  60 Changes due to the new hit structure.
  61
  62 Revision 1.26  2000/10/05 16:16:29  kowal2
  63 Corrections of the hit recording algorithm.
  64
  65 Revision 1.25  2000/10/02 21:28:18  fca
  66 Removal of useless dependecies via forward declarations
  67
  68 Revision 1.24  2000/08/28 10:02:30  kowal2
  69 Corrected bug in the StepManager
  70
  71 Revision 1.23  2000/07/10 20:57:39  hristov
  72 Update of TPC code and macros by M.Kowalski
  73
  74 Revision 1.22  2000/06/30 12:07:50  kowal2
  75 Updated from the TPC-PreRelease branch
  76
  77 Revision 1.21.2.4  2000/06/26 07:39:42  kowal2
  78 Changes to obey the coding rules
  79
  80 Revision 1.21.2.3  2000/06/25 08:38:41  kowal2
  81 Splitted from AliTPCtracking
  82
  83 Revision 1.21.2.2  2000/06/16 12:58:13  kowal2
  84 Changed parameter settings
  85
  86 Revision 1.21.2.1  2000/06/09 07:15:07  kowal2
  87
  88 Defaults loaded automatically (hard-wired)
  89 Optional parameters can be set via macro called in the constructor
  90
  91 Revision 1.21  2000/05/15 10:00:30  kowal2
  92 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
  93
  94 Revision 1.20  2000/04/17 09:37:33  kowal2
  95 removed obsolete AliTPCDigitsDisplay.C
  96
  97 Revision 1.19.8.2  2000/04/10 08:31:52  kowal2
  98
  99 Different geometry for different sectors
 100 Updated readout chambers
 101 Some modifications to StepManager by J.Belikov
 102
 103 Revision 1.19.8.1  2000/04/10 07:56:53  kowal2
 104 Not used anymore - removed
 105
 106 Revision 1.19  1999/11/04 17:28:07  fca
 107 Correct barrel part of HV Degrader
 108
 109 Revision 1.18  1999/10/14 16:52:08  fca
 110 Only use PDG codes and not GEANT ones
 111
 112 Revision 1.17  1999/10/08 06:27:23  fca
 113 Corrected bug in the HV degrader geometry, thanks to G.Tabary
 114
 115 Revision 1.16  1999/10/04 13:39:54  fca
 116 Correct array index problem
 117
 118 Revision 1.15  1999/09/29 09:24:34  fca
 119 Introduction of the Copyright and cvs Log
 120
 121 */
 122
 123 //
 124 ///////////////////////////////////////////////////////////////////////////////
 125 //                                                                           //
 126 //  Time Projection Chamber version 2 -- detailed TPC and slow simulation    //
 127 //                                                                           //
 128 //Begin_Html
 129 /*
 130 <img src="picts/AliTPCv2Class.gif">
 131 */
 132 //End_Html
 133 //                                                                           //
 134 //                                                                           //
 135 ///////////////////////////////////////////////////////////////////////////////
 136 #include <stdlib.h>
 137
 138 #include <TMath.h>
 139
 140 #include "AliTPCv2.h"
 141 #include "AliTPCDigitsArray.h"
 142 #include "AliRun.h"
 143 #include "AliMC.h"
 144 #include "AliConst.h"
 145 #include "AliPDG.h"
 146 #include "AliTPCParam.h"
 147 #include "AliTPCParamSR.h"
 148 #include "AliTPCTrackHitsV2.h"
 149 #include "TLorentzVector.h"
 150
 151
 152 ClassImp(AliTPCv2)
 153
 154 //_____________________________________________________________________________
 155 AliTPCv2::AliTPCv2(const char *name, const char *title) :
 156   AliTPC(name, title)
 157 {
 158   //
 159   // Standard constructor for Time Projection Chamber version 2
 160   //
 161   fIdSens=0;
 162   fIdLSec=0;
 163   fIdUSec=0;
 164
 165   SetBufferSize(128000);
 166
 167   SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
 168
 169   // Default sectors
 170
 171   SetSecAL(4);
 172   SetSecAU(4);
 173   SetSecLows(1,  2,  3, 19, 20, 21);
 174   SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
 175   SetSens(1); // sensitive strips set
 176
 177   if (fTPCParam)
 178      fTPCParam->Write(fTPCParam->GetTitle());
 179 }
 180
 181 //_____________________________________________________________________________
 182 void AliTPCv2::CreateGeometry()
 183 {
 184   //
 185   // Create the geometry of Time Projection Chamber version 2
 186   //
 187   //Begin_Html
 188   /*
 189     <img src="picts/AliTPC.gif">
 190   */
 191   //End_Html
 192   //Begin_Html
 193   /*
 194     <img src="picts/AliTPCv2Tree.gif">
 195   */
 196   //End_Html
 197
 198
 199   Int_t *idtmed = fIdtmed->GetArray();
 200
 201   Float_t dm[50];
 202   Int_t idrotm[120];
 203
 204   Int_t nRotMat = 0;
 205
 206   Int_t i,ifl1=0;
 207
 208   // number of sectors
 209
 210   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 211   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 212
 213   // ---------------------------------------------------
 214   //        sector specification check
 215   // ---------------------------------------------------
 216   if (fSecAL >= 0) {
 217     ifl1 = 0;
 218
 219     for (i = 0; i < 6; ++i) {
 220       if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
 221         ifl1 = 1;
 222         printf("%s: *** SECTOR %d selected\n",ClassName(),fSecLows[i]);
 223       }
 224     }
 225
 226   } else {
 227     printf("%s: *** ALL LOWER SECTORS SELECTED ***\n",ClassName());
 228     ifl1 = 1;
 229   }
 230
 231   if (ifl1 == 0) {
 232     printf("%s: *** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n",ClassName());
 233     printf("%s: !!! PROGRAM STOPPED !!!\n",ClassName());
 234     exit(1);
 235   }
 236
 237   if (fSecAU >= 0) {
 238
 239     for (i = 0; i < 12; ++i) {
 240       if (fSecUps[i] > 2*nInnerSector-1 &&
 241           fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
 242         printf("%s: *** SECTOR %d selected\n",ClassName(),fSecUps[i]);
 243       }
 244     }
 245
 246   } else {
 247     printf("%s: *** ALL UPPER SECTORS SELECTED ***\n",ClassName());
 248   }
 249
 250
 251
 252   //--------------------------------------------------------------------
 253
 254   //
 255   //  Mother volume TPC (Air) - all volumes will be positioned in it
 256   //
 257
 258   dm[0]=0.;
 259   dm[1]=360.;
 260   dm[2]=8.;
 261
 262   //
 263
 264   dm[3]=-283.7;
 265   dm[4]=65.6;
 266   dm[5]=278.;
 267
 268   //
 269
 270   dm[6]=-253.6;
 271   dm[7]=65.6;
 272   dm[8]=278.;
 273
 274   //
 275
 276   dm[9]=-73.3;
 277   dm[10]=60.9;
 278   dm[11]=278.;
 279
 280   //
 281
 282   dm[12]=-73.3;
 283   dm[13]=56.9;
 284   dm[14]=278.;
 285
 286   //
 287
 288   dm[15]=73.3;
 289   dm[16]=56.9;
 290   dm[17]=278.;
 291
 292   //
 293
 294   dm[18]=73.3;
 295   dm[19]=60.9;
 296   dm[20]=278.;
 297
 298   //
 299
 300   dm[21]=253.6;
 301   dm[22]=65.6;
 302   dm[23]=278.;
 303
 304   //
 305
 306   dm[24]=283.7;
 307   dm[25]=65.6;
 308   dm[26]=278.;
 309
 310   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,27);
 311
 312   // outer part
 313
 314   //-------------------------------------------------------------------
 315   //   Tpc Outer INsulator (CO2) - contains cont. vessel and field cage
 316   //-------------------------------------------------------------------
 317
 318   dm[0]= 0.;
 319   dm[1]= 360.;
 320   dm[2]= 6.;
 321
 322   //
 323
 324   dm[3]=-253.6;
 325   dm[4]=258.;
 326   dm[5]=275.5;
 327
 328   //
 329
 330   dm[6]=-250.6;
 331   dm[7]=258.;
 332   dm[8]=275.5;
 333
 334   //
 335
 336   dm[9]=-250.6;
 337   dm[10]=258.;
 338   dm[11]=278.;
 339
 340   //
 341
 342   dm[12]=253.6;
 343   dm[13]=258.;
 344   dm[14]=278.;
 345
 346   //
 347
 348   dm[15]=253.6;
 349   dm[16]=264.8;
 350   dm[17]=278.;
 351
 352   //
 353
 354   dm[18]=256.6;
 355   dm[19]=264.8;
 356   dm[20]=278.;
 357
 358   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
 359
 360   //----------------------------------------------------------------
 361   // Tpc Outer Contaiment Vessel
 362   //  mother volume - Al, daughters - composite (sandwich)
 363   //----------------------------------------------------------------
 364
 365   dm[0]=0.;
 366   dm[1]=360.;
 367   dm[2]=6.;
 368
 369   //
 370
 371   dm[3]=-250.6;
 372   dm[4]=270.4;
 373   dm[5]=278.;
 374
 375   //
 376
 377   dm[6]=-247.6;
 378   dm[7]=270.4;
 379   dm[8]=278.;
 380
 381   //
 382
 383   dm[9]=-247.6;
 384   dm[10]=274.8124;
 385   dm[11]=278.;
 386
 387   //
 388
 389   dm[12]=253.6;
 390   dm[13]=274.8124;
 391   dm[14]=278.;
 392
 393   //
 394
 395   dm[15]=253.6;
 396   dm[16]=264.8;
 397   dm[17]=278.;
 398
 399   //
 400
 401   dm[18]=256.6;
 402   dm[19]=264.8;
 403   dm[20]=278.;
 404
 405   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
 406
 407   // Daughter volumes - sandwich
 408
 409   // Tpc SAndwich 1 - Al
 410
 411   dm[0]=274.8124;
 412   dm[1]=278.;
 413   dm[2]=252.1;
 414
 415   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
 416
 417   // Tpc SAndwich 2 - epoxy glue (I use Lexan)
 418
 419   dm[0] += 5.e-3;
 420   dm[1] -= 5.e-3;
 421
 422   gMC->Gsvolu("TSA2","TUBE",idtmed[14],dm,3);
 423
 424   // Tpc SAndwich 3 - Tedlar
 425
 426   dm[0] += 0.01;
 427   dm[1] -= 0.01;
 428
 429   gMC->Gsvolu("TSA3","TUBE",idtmed[9],dm,3);
 430
 431
 432   // Tpc SAndwich 4 - fiber glass (G10)
 433
 434   dm[0] += 3.8e-3;
 435   dm[1] -= 3.8e-3;
 436
 437   gMC->Gsvolu("TSA4","TUBE",idtmed[12],dm,3);
 438
 439   // Tpc SAndwich 5 - NOMEX honeycomb
 440
 441   dm[0] += 0.075;
 442   dm[1] -= 0.075;
 443
 444   gMC->Gsvolu("TSA5","TUBE",idtmed[6],dm,3);
 445
 446   // 5->4->3->2->1->TCOV
 447
 448
 449   gMC->Gspos("TSA5",1,"TSA4",0.,0.,0.,0,"ONLY");
 450   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
 451   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
 452   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
 453
 454   gMC->Gspos("TSA1",1,"TOCV",0.,0.,3.,0,"ONLY");
 455
 456   // TCOV-> TOIN
 457
 458   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
 459
 460   //-------------------------------------------------------
 461   //  Tpc Outer Field Cage
 462   //  mother volume - Al, daughters - composite (sandwich)
 463   //-------------------------------------------------------
 464
 465   dm[0]=0.;
 466   dm[1]=360.;
 467   dm[2]=6.;
 468
 469   //
 470
 471   dm[3]=-253.6;
 472   dm[4]=258.;
 473   dm[5]=275.5;
 474
 475   //
 476
 477   dm[6]=-250.6;
 478   dm[7]=258.;
 479   dm[8]=275.5;
 480
 481   //
 482
 483   dm[9]=-250.6;
 484   dm[10]=258.;
 485   dm[11]=260.0476;
 486
 487   //
 488
 489   dm[12]=250.6;
 490   dm[13]=258.;
 491   dm[14]=260.0476;
 492
 493   //
 494
 495   dm[15]=250.6;
 496   dm[16]=258.;
 497   dm[17]=275.5;
 498
 499   //
 500
 501   dm[18]=253.6;
 502   dm[19]=258.;
 503   dm[20]=275.5;
 504
 505   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);
 506
 507   // Daughter volumes
 508
 509   // Tpc SAndwich 6 - Tedlar
 510
 511   dm[0]= 258.;
 512   dm[1]= 260.0476;
 513   dm[2]= 252.1;
 514
 515   gMC->Gsvolu("TSA6","TUBE",idtmed[9],dm,3);
 516
 517   // Tpc SAndwich 7 - fiber glass
 518
 519   dm[0] += 3.8e-3;
 520   dm[1] -= 3.8e-3;
 521
 522   gMC->Gsvolu("TSA7","TUBE",idtmed[12],dm,3);
 523
 524
 525   // Tpc SAndwich 8 - NOMEX
 526
 527   dm[0] += 0.02;
 528   dm[1] -= 0.02;
 529
 530   gMC->Gsvolu("TSA8","TUBE",idtmed[6],dm,3);
 531
 532   // 8->7->6->TOFC
 533
 534   gMC->Gspos("TSA8",1,"TSA7",0.,0.,0.,0,"ONLY");
 535   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
 536   gMC->Gspos("TSA6",1,"TOFC",0.,0.,0.,0,"ONLY");
 537
 538   // TOFC->TOIN
 539
 540   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY");
 541
 542   // TOIN->TPC
 543
 544   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 545
 546   // inner part
 547
 548   //--------------------------------------------------------------------
 549   // Tpc Inner INsulator (CO2) - inner f.c. will be placed there
 550   // Inner containment vessel will be placed directly in the TPC
 551   //--------------------------------------------------------------------
 552
 553   dm[0]=0.;
 554   dm[1]=360.;
 555   dm[2]=4.;
 556
 557   //
 558
 559   dm[3]=-253.6;
 560   dm[4]=65.9;
 561   dm[5]=79.2;
 562
 563   //
 564
 565   dm[6]=-73.3;
 566   dm[7]=61.2;
 567   dm[8]=79.2;
 568
 569   //
 570
 571   dm[9]=73.3;
 572   dm[10]=61.2;
 573   dm[11]=79.2;
 574
 575   //
 576
 577   dm[12]=253.6;
 578   dm[13]=65.9;
 579   dm[14]=79.2;
 580
 581   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,15);
 582
 583   // the middle part of the F.C. is thinner - carve out the strip - Ne-CO2
 584
 585   dm[0]=79.16;
 586   dm[1]=79.2;
 587   dm[2]=88.;
 588
 589   gMC->Gsvolu("TII1","TUBE",idtmed[1],dm,3);
 590
 591   gMC->Gspos("TII1",1,"TIIN",0.,0.,0.,0,"ONLY");
 592
 593   //-----------------------------------------------------
 594   // Tpc Inner Field Cage
 595   // mother volume - Al, daughters - composite (sandwich)
 596   //------------------------------------------------------
 597
 598   dm[0]=0.;
 599   dm[1]=360.;
 600   dm[2]=10.;
 601
 602   //
 603
 604   dm[3]=-253.6;
 605   dm[4]=70.3;
 606   dm[5]=79.2;
 607
 608   //
 609
 610   dm[6]=-250.6;
 611   dm[7]=70.3;
 612   dm[8]=79.2;
 613
 614   //
 615
 616   dm[9]=-250.6;
 617   dm[10]=77.0524;
 618   dm[11]=79.2;
 619
 620   //
 621
 622   dm[12]=-88.;
 623   dm[13]=77.0524;
 624   dm[14]=79.2;
 625
 626   //
 627
 628   dm[15]=-88.;
 629   dm[16]=77.0924;
 630   dm[17]=79.16;
 631
 632   //
 633
 634   dm[18]=88.;
 635   dm[19]=77.0924;
 636   dm[20]=79.16;
 637
 638   //
 639
 640   dm[21]=88.;
 641   dm[22]=77.0524;
 642   dm[23]=79.2;
 643
 644   //
 645
 646   dm[24]=250.6;
 647   dm[25]=77.0524;
 648   dm[26]=79.2;
 649
 650   //
 651
 652   dm[27]=250.6;
 653   dm[28]=70.3;
 654   dm[29]=79.2;
 655
 656   //
 657
 658   dm[30]=253.6;
 659   dm[31]=70.3;
 660   dm[32]=79.2;
 661
 662   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,33);
 663
 664   // daughter volumes - central part
 665
 666   // Tpc Sandwich 9 -Tedlar
 667
 668   dm[0]=77.0924;
 669   dm[1]=79.16;
 670   dm[2]=88.;
 671
 672   gMC->Gsvolu("TSA9","TUBE",idtmed[9],dm,3);
 673
 674   // Tpc Sandwich 10 - fiber glass (G10)
 675
 676   dm[0] += 3.8e-3;
 677   dm[1] -= 3.8e-3;
 678
 679   gMC->Gsvolu("TS10","TUBE",idtmed[12],dm,3);
 680
 681   // Tpc Sandwich 11 - NOMEX
 682
 683   dm[0] += 0.03;
 684   dm[1] -= 0.03;
 685
 686   gMC->Gsvolu("TS11","TUBE",idtmed[6],dm,3);
 687
 688   // 11->10->9->TIFC
 689
 690   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
 691   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
 692
 693   gMC->Gspos("TSA9",1,"TIFC",0.,0.,0.,0,"ONLY");
 694
 695   // daughter volumes - outer parts (reinforced)
 696
 697   // Tpc Sandwich 12 -Tedlar
 698
 699   dm[0]=77.0524;
 700   dm[1]=79.2;
 701   dm[2]=82.05;
 702
 703   gMC->Gsvolu("TS12","TUBE",idtmed[9],dm,3);
 704
 705   // Tpc Sandwich 13 - fiber glass (G10)
 706
 707   dm[0] += 3.8e-3;
 708   dm[1] -= 3.8e-3;
 709
 710   gMC->Gsvolu("TS13","TUBE",idtmed[12],dm,3);
 711
 712   // Tpc Sandwich 14 - NOMEX
 713
 714   dm[0] += 0.07;
 715   dm[1] -= 0.07;
 716
 717   gMC->Gsvolu("TS14","TUBE",idtmed[6],dm,3);
 718
 719   // 14->13->12->TIFC
 720
 721   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
 722   gMC->Gspos("TS13",1,"TS12",0.,0.,0.,0,"ONLY");
 723
 724   gMC->Gspos("TS12",1,"TIFC",0.,0.,170.05,0,"ONLY");
 725   gMC->Gspos("TS12",2,"TIFC",0.,0.,-170.05,0,"ONLY");
 726
 727   // place this inside the inner insulator
 728
 729   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
 730
 731   // and now in the TPC...
 732
 733   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
 734
 735   //---------------------------------------------------------
 736   // Tpc Inner Containment vessel - Cones
 737   //---------------------------------------------------------
 738
 739   dm[0]=0.;
 740   dm[1]=360.;
 741   dm[2]=8.;
 742
 743   //
 744
 745   dm[3]=71.8;
 746   dm[4]=56.9;
 747   dm[5]=59.4;
 748
 749   //
 750
 751   dm[6]=73.;
 752   dm[7]=56.9;
 753   dm[8]=59.4;
 754
 755   //
 756
 757   dm[9]=73.;
 758   dm[10]=56.9;
 759   dm[11]=61.2;
 760
 761   //
 762
 763   dm[12]=73.3;
 764   dm[13]=56.9;
 765   dm[14]=61.2;
 766
 767   //
 768
 769   dm[15]=73.3;
 770   dm[16]=60.9;
 771   dm[17]=61.2;
 772
 773   //
 774
 775   dm[18]=253.6;
 776   dm[19]=65.6;
 777   dm[20]=65.9;
 778
 779   //
 780
 781   dm[21]=253.6;
 782   dm[22]=65.6;
 783   dm[23]=74.6;
 784
 785   //
 786
 787   dm[24]=256.6;
 788   dm[25]=65.6;
 789   dm[26]=74.6;
 790
 791   gMC->Gsvolu("TICC","PCON",idtmed[4],dm,27);
 792
 793   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
 794
 795   // reflection matrix
 796
 797   theta1 = 90.;
 798   phi1   = 0.;
 799   theta2 = 90.;
 800   phi2   = 270.;
 801   theta3 = 180.;
 802   phi3   = 0.;
 803
 804   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 805
 806   gMC->Gspos("TICC",1,"TPC ",0.,0.,0.,0,"ONLY");
 807   gMC->Gspos("TICC",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 808
 809
 810   //---------------------------------------------------------
 811   // Tpc Inner Containment vessel - Middle part -Al
 812   //---------------------------------------------------------
 813
 814   dm[0]=0.;
 815   dm[1]=360.;
 816   dm[2]=6.;
 817
 818   //
 819
 820   dm[3]=-71.6;
 821   dm[4]=60.2;
 822   dm[5]=61.2;
 823
 824   //
 825
 826   dm[6]=-69.1;
 827   dm[7]=60.2;
 828   dm[8]=61.2;
 829
 830   //
 831
 832   dm[9]=-69.1;
 833   dm[10]=60.6224;
 834   dm[11]=61.2;
 835
 836   //
 837
 838   dm[12]=69.1;
 839   dm[13]=60.6224;
 840   dm[14]=61.2;
 841
 842   //
 843
 844   dm[15]=69.1;
 845   dm[16]=60.2;
 846   dm[17]=61.2;
 847
 848   //
 849
 850   dm[18]=71.6;
 851   dm[19]=60.2;
 852   dm[20]=61.2;
 853
 854   gMC->Gsvolu("TICM","PCON",idtmed[4],dm,21);
 855
 856   // Tpc Sandwich 15 - Al
 857
 858   dm[0]=60.6224;
 859   dm[1]=61.2;
 860   dm[2]=70.1;
 861
 862   gMC->Gsvolu("TS15","TUBE",idtmed[4],dm,3);
 863
 864   // Tpc Sandwich 16 -  epoxy glue
 865
 866   dm[0] += 5.e-3;
 867   dm[1] -= 5.e-3;
 868
 869   gMC->Gsvolu("TS16","TUBE",idtmed[14],dm,3);
 870
 871   // Tpc Sandwich 17 - Tedlar
 872
 873   dm[0] += 0.01;
 874   dm[1] -= 0.01;
 875
 876   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
 877
 878   // Tpc Sandwich 18 - carbon fiber
 879
 880   dm[0] += 3.8e-3;
 881   dm[1] -= 3.8e-3;
 882
 883   gMC->Gsvolu("TS18","TUBE",idtmed[15],dm,3);
 884
 885   // Tpc Sandwich 19 - Nomex
 886
 887   dm[0] += 0.02;
 888   dm[1] -= 0.02;
 889
 890   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
 891
 892   // 19->18->17->16->15-> TICM
 893
 894   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
 895   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
 896   gMC->Gspos("TS17",1,"TS16",0.,0.,0.,0,"ONLY");
 897   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
 898
 899   gMC->Gspos("TS15",1,"TICM ",0.,0.,0.,0,"ONLY");
 900
 901
 902   // TPc inner cont. vessel Joints
 903
 904   dm[0]=60.2;
 905   dm[1]=61.2;
 906   dm[2]=0.5;
 907
 908   gMC->Gsvolu("TPJ1","TUBE",idtmed[4],dm,3);
 909
 910   gMC->Gspos("TPJ1",1,"TPC ",0.,0.,72.3,0,"ONLY");
 911   gMC->Gspos("TPJ1",2,"TPC ",0.,0.,-72.3,0,"ONLY");
 912
 913   //
 914
 915   dm[0]=0.;
 916   dm[1]=360.;
 917   dm[2]=4.;
 918
 919   //
 920
 921   dm[3]=70.8;
 922   dm[4]=58.4;
 923   dm[5]=60.1;
 924
 925   //
 926
 927   dm[6]=71.2;
 928   dm[7]=58.4;
 929   dm[8]=60.1;
 930
 931   //
 932
 933   dm[9]=71.2;
 934   dm[10]=58.4;
 935   dm[11]=59.4;
 936
 937   //
 938
 939   dm[12]=71.6;
 940   dm[13]=58.4;
 941   dm[14]=59.4;
 942
 943   gMC->Gsvolu("TPJ2","PCON",idtmed[4],dm,15);
 944
 945   gMC->Gspos("TPJ2",1,"TPC ",0.,0.,0.,0,"ONLY");
 946   gMC->Gspos("TPJ2",2,"TPC ",0.,0.,0.,idrotm[nRotMat],"ONLY");
 947
 948
 949
 950   // Tpc Inner Containment vessel Seal (Viton, I use Lexan for a time being)
 951
 952   dm[0]=58.4;
 953   dm[1]=61.2;
 954   dm[2]=0.1;
 955
 956   gMC->Gsvolu("TICS","TUBE",idtmed[14],dm,3);
 957
 958   gMC->Gspos("TICS",1,"TPC ",0.,0.,71.7,0,"ONLY");
 959   gMC->Gspos("TICS",2,"TPC ",0.,0.,-71.7,0,"ONLY");
 960
 961   // TICM -> TPC
 962
 963   gMC->Gspos("TICM",1,"TPC ",0.,0.,0.,0,"ONLY");
 964
 965   //
 966
 967   nRotMat++; // prepare for the next rotation matrix
 968
 969   //---------------------------------------------------------
 970   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
 971   //  and its daughters (HV membrane, rods, readout chambers)
 972   //---------------------------------------------------------
 973
 974   dm[0]= 79.2;
 975   dm[1]= 258.0;
 976   dm[2]= 253.6;
 977
 978   gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);
 979
 980   // sector opening angles
 981
 982   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
 983   Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
 984
 985   // sector angle shift
 986
 987   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
 988
 989
 990   // All above parameters are identical for inner and outer
 991   // sectors. The distinction is kept for the historical reasons
 992   // and eventually will disappear.
 993
 994   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
 995   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
 996   Float_t space;
 997
 998   //-------------------------------------------------------------------------
 999   //   Tpc Inner Readout Chambers
1000   //-------------------------------------------------------------------------
1001
1002   dm[0]= 14.483;
1003   dm[1]= 23.3345;
1004   dm[2]= 1.6; // thickness
1005   dm[3]= 25.1;
1006
1007   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1008
1009   // this volume will be positioned in the empty space
1010   // of the end-cap to avoid overlaps
1011
1012   dm[0]= 13.7305;
1013   dm[1]= 21.1895;
1014   dm[2]= 2.25;
1015   dm[3]= 21.15;
1016
1017   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1018
1019
1020   //------------------------------------------------
1021   // Tpc Inner readout chamber Pad Plane
1022   //------------------------------------------------
1023
1024   dm[0]= 14.483;
1025   dm[1]= 23.3345;
1026   dm[2]= 0.5;
1027   dm[3]= 25.1;
1028
1029   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1030
1031   //
1032
1033   dm[0] -= 1.218511934;
1034   dm[1] -= 1.218511934;
1035   dm[2] = 0.35;
1036
1037   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1038
1039   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1040
1041   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1042
1043
1044   //----------------------------------------------
1045   // Tpc Readout Chambers Empty spaces - for both
1046   // inner and outer sectors
1047   //----------------------------------------------
1048
1049   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1050
1051   // Inner sector - 4 spaces
1052
1053
1054   dm[3] = 4.7625;
1055   dm[0] = 12.472;
1056
1057   Float_t rr = 90.52;
1058   Float_t zz;
1059
1060   zz= -12.7875;
1061
1062   space = rr*tanAlpha-dm[0];
1063
1064   for(Int_t nsLow=0;nsLow<4;nsLow++){
1065
1066     rr += 9.525;
1067     dm[1]= rr*tanAlpha - space;
1068
1069     dm[2]=0.8;
1070
1071     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1072
1073     //
1074
1075     dm[2] = 1.2;
1076
1077     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1078
1079     rr += 0.4;
1080     dm[0] = rr*tanAlpha - space;
1081     zz += (0.4+9.525);
1082
1083   }
1084
1085   dm[0]= 12.472;
1086   // dm[1] - this is the dm[1] from the previous TRCE
1087   dm[2]= 1.05;
1088   dm[3]= 19.65;
1089
1090   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4);
1091
1092   //
1093   // TPc Space for Connectors
1094   //
1095
1096   dm[0]= .3;
1097   dm[1]= .3;
1098   dm[2]= 4.5;
1099
1100   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1101
1102   // TPC Connectors
1103
1104   dm[0]= .25;
1105   dm[1]= .15;
1106   dm[2]= 3.75;
1107
1108   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3);
1109
1110   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1111
1112   zz = -12.7875;
1113
1114
1115   Float_t alpha;
1116   Float_t astep;
1117
1118   // inner part of the inner sector - 2 x 20 holes
1119
1120   astep = 20.00096874/19.;
1121
1122   alpha = 10.00048437-astep;
1123
1124   Float_t x1,x2;
1125
1126     x1 = 13.31175725;
1127     x1 -= 0.996357832;
1128
1129     x2 = 15.06180253;
1130     x2 -= 1.163028812;
1131
1132   Int_t ncon;
1133
1134   for(ncon=0;ncon<20;ncon++){
1135
1136     phi1 = 0.;
1137     theta1 = 90.+alpha;
1138     phi2=90.;
1139     theta2 = 90.;
1140     phi3 = (alpha>0) ? 0. : 180.;
1141     theta3 = TMath::Abs(alpha);
1142
1143     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1144
1145
1146
1147     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1148     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1149
1150
1151     x1 -= 1.296357833;
1152     x2 -= 1.463028812;
1153
1154     alpha -= astep;
1155     nRotMat++;
1156
1157   }
1158
1159   // outer part of the inner sector - 2 x 25 holes
1160
1161    astep = 20.00096874/24.;
1162    alpha = 10.00048437-astep;
1163
1164    x1 = 16.81184781;
1165    x1 -= 1.016295986;
1166
1167    x2 = 18.5618931;
1168    x2 -= 1.150914854;
1169
1170   for(ncon=0;ncon<25;ncon++){
1171
1172     phi1 = 0.;
1173     theta1 = 90.+alpha;
1174     phi2=90.;
1175     theta2 = 90.;
1176     phi3 = (alpha>0) ? 0. : 180.;
1177     theta3 = TMath::Abs(alpha);
1178
1179     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1180
1181
1182
1183     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1184     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1185
1186
1187     x1 -= 1.316295986;
1188     x2 -= 1.450914854;
1189
1190     alpha -= astep;
1191     nRotMat++;
1192
1193   }
1194
1195   //--------------------------------------------------------------------------
1196   //  TPC Outer Readout Chambers
1197   //  this is NOT a final design
1198   //--------------------------------------------------------------------------
1199
1200   dm[0]= 23.3875;
1201   dm[1]= 43.524;
1202   dm[2]= 1.5; //thickness
1203   dm[3]= 57.1;
1204
1205   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1206
1207   //------------------------------------------------
1208   // Tpc Outer readout chamber Pad Plane
1209   //------------------------------------------------
1210
1211   dm[2]= 0.5;
1212
1213   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1214
1215   dm[0] -= 1.218511934;
1216   dm[1] -= 1.218511934;
1217   dm[2] = 0.35;
1218
1219   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1220
1221   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1222
1223   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1224
1225   // empty space
1226
1227   dm[0]= 21.035;
1228   dm[1]= 38.7205;
1229   dm[2]= 0.7;
1230   dm[3]= 50.15;
1231
1232   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);
1233
1234   dm[0]= 22.2935;
1235   dm[1]= 40.5085;
1236   dm[2]= 2.25;
1237   dm[3]= 51.65;
1238
1239   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1240
1241   dm[0]= 21.35;
1242   dm[1]= 38.7205;
1243   dm[2]= 2.25;
1244   dm[3]= 50.15;
1245
1246   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4);
1247
1248   //-----------------------------------------------
1249   // Tpc Services Support Wheel
1250   //-----------------------------------------------
1251
1252   dm[0]=0.;
1253   dm[1]=360.;
1254   dm[2]=18.;
1255   dm[3]=2.;
1256
1257   dm[4]= -5.;
1258   dm[5]= 77.017;
1259   dm[6]= 255.267;
1260
1261   dm[7]= 5.;
1262   dm[8]= dm[5];
1263   dm[9]= dm[6];
1264
1265   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1266
1267   // Tpc Services Wheel Cover
1268
1269   dm[4]= -0.5;
1270   dm[7]= 0.5;
1271
1272   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1273
1274   // Tpc Service wheel Cover Empty space
1275
1276   dm[0]= 10.99;
1277   dm[1]= 39.599;
1278   dm[2]= .5;
1279   dm[3]= 81.125;
1280
1281   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1282
1283   // Tpc services Wheel Empty Spaces
1284
1285   dm[0]= 13.18017507;
1286   dm[1]= 44.61045938;
1287   dm[2]= 4.;
1288   dm[3]= 89.125;
1289
1290   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1291
1292   // Tpc Services Wheel Bars
1293
1294   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1295
1296   // bars-> TWES
1297
1298   dm[2]= 4.;
1299   dm[3]= .4;
1300
1301   dm[0]= 13.8149522;
1302   dm[1]= 13.95601379;
1303
1304   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1305
1306   dm[0]= 43.83462067;
1307   dm[1]= 43.97568225;
1308
1309   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1310
1311   // TPc ELectronics - right now 30% X0 Si
1312
1313   dm[0]= 14.03813696;
1314   dm[1]= 43.3524075;
1315   dm[2]= 1.404;
1316   dm[3]= 83.125;
1317
1318   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1319   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1320
1321   //--------------------------------------------------------------------------
1322   //  End caps
1323   //--------------------------------------------------------------------------
1324
1325   // TPc Main Wheel - Al
1326
1327   dm[0]= 74.9;
1328   dm[1]= 264.4;
1329   dm[2]= 3.0;
1330
1331   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1332
1333   //--------------------------------------------------------------------------
1334   //  Tpc Empty Space for the Readout chambers
1335   //--------------------------------------------------------------------------
1336
1337   Float_t rLow= 86.2;
1338   Float_t rUp= 243.5;
1339   Float_t dR = 0.5*(rUp-rLow);
1340
1341   space= 1.5/cosAlpha; // wheel ribs are 3.0 cm wide
1342
1343   dm[0]= rLow*tanAlpha-space;
1344   dm[1]= rUp*tanAlpha-space;
1345   dm[2] = 3.0;
1346   dm[3]= dR;
1347
1348   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1349
1350   // TIC1->TESR
1351
1352   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1353
1354   // TOC1->TESR
1355
1356   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1357
1358   // Tpc Empty Space Bars - Al (daughters of TESR)
1359
1360   Float_t zBar;
1361
1362   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1363
1364   // lower bar
1365
1366   dm[0]= rLow*tanAlpha-space;
1367   dm[1]= 88.7*tanAlpha-space;
1368   dm[2]= 2.25;
1369   dm[3]= 1.275;
1370
1371   zBar = -dR+dm[3];
1372
1373   gMC->Gsposp("TESB",1,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1374
1375   // middle bar
1376
1377   dm[0]= 131.65*tanAlpha-space;
1378   dm[1]= 136.5*tanAlpha-space;
1379   dm[3]= 2.425;
1380
1381   zBar = -dR +131.65+dm[3]-rLow;
1382
1383   gMC->Gsposp("TESB",2,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1384
1385   // upper bar
1386
1387   dm[0]= 240.4*tanAlpha-space;
1388   dm[1]= rUp*tanAlpha-space;
1389   dm[3]= 1.55;
1390
1391   zBar = dR-dm[3];
1392
1393   gMC->Gsposp("TESB",3,"TESR",0.,0.75,zBar,0,"ONLY",dm,4);
1394
1395   //------------------------------------------------------
1396   //  TPc Lower "S" Sectors
1397   //------------------------------------------------------
1398
1399
1400   Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1401   Float_t inSecUpEdge =  fTPCParam->GetInnerRadiusUp();
1402
1403   dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1404   dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1405   dm[2] = 0.5*(250. - 5.e-3);
1406   dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);
1407
1408   gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive
1409
1410
1411   //----------------------------------------------------------
1412   //  TPc Upper Sectors
1413   //----------------------------------------------------------
1414
1415   Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1416   Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1417
1418   dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1419   dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;
1420   dm[2] = 0.5*(250. - 5.e-3);
1421   dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1422
1423   gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1424
1425
1426
1427   // sensitive strips
1428
1429     gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1430
1431     Int_t nofStrips,nstr;
1432     Float_t r1,r2,zs;
1433     Float_t stripThick = 0.01; // 100 microns
1434     Float_t deadSpace;
1435
1436     // inner sector
1437
1438
1439     // if all lower sectors selected define only 1 strip
1440
1441     nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow();
1442     deadSpace = fTPCParam->GetInnerWireMount();
1443
1444     dm[2] = 0.5*(250. - 5.e-3);
1445     dm[3] = 0.5 * stripThick;
1446
1447     for(nstr=0;nstr<nofStrips;nstr++){
1448
1449       r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1450       r2 = r1 + stripThick;
1451       dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1452       dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1453       zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1454       zs += r1;
1455       zs += dm[3];
1456
1457       gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1458
1459
1460     }
1461
1462     // strips only if several upper sectors selected end fSens > 0
1463
1464     if(fSecAU >=0 && fSens >0){
1465
1466     Int_t nsSave = nofStrips;
1467
1468     // outer sector
1469
1470     nofStrips = fTPCParam->GetNRowUp();
1471     deadSpace = fTPCParam->GetOuterWireMount();
1472
1473     dm[2] = 0.5*(250. - 5.e-3);
1474     dm[3] = 0.5 * stripThick;
1475
1476
1477     for(nstr=0;nstr<nofStrips;nstr++){
1478
1479       r1 = fTPCParam->GetPadRowRadiiUp(nstr);
1480       r2 = r1 + stripThick;
1481       dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1482       dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1483       zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1484       zs += r1;
1485       zs += dm[3];
1486
1487       gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1488
1489      }
1490     }
1491
1492
1493   //-------------------------------------------------------
1494   //  positioning of the empty spaces into the main wheel
1495   //  and readout chambers and sectors into the drift gas
1496   //-------------------------------------------------------
1497
1498   Float_t rCenter,xc,yc;
1499   Float_t rInner,rOuter; // center of the inner and outer chamber
1500
1501   rCenter = rLow+dR;
1502
1503   rInner = 108.07;
1504   rOuter = 190.68;
1505
1506
1507   for(Int_t ns=0; ns<nInnerSector;ns++){
1508
1509     phi1 = ns * innerOpenAngle + innerAngleShift;
1510     phi1 *= kRaddeg; // in degrees
1511
1512     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1513
1514     if (phi1 > 360.) phi1 -= 360.;
1515
1516     theta1 = 90.;
1517     phi2   = 90.;
1518     theta2 = 180.;
1519     phi3   = ns * innerOpenAngle + innerAngleShift;
1520     phi3 *= kRaddeg; // in degrees
1521
1522     phi3 = (Float_t)TMath::Nint(phi3);
1523
1524     if(phi3 > 360.) phi3 -= 360.;
1525
1526     theta3 = 90.;
1527
1528     // "holes"->End plate
1529
1530     xc = rCenter*TMath::Cos(phi3*kDegrad);
1531     yc = rCenter*TMath::Sin(phi3*kDegrad);
1532
1533     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1534
1535     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1536
1537     // TSCE->TSWC (services wheel volumes)
1538
1539     xc = 166.142*TMath::Cos(phi3*kDegrad);
1540     yc = 166.142*TMath::Sin(phi3*kDegrad);
1541
1542     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1543     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1544
1545
1546     // readout chambers->TDGN (drift gas)
1547
1548     xc = rInner*TMath::Cos(phi3*kDegrad);
1549     yc = rInner*TMath::Sin(phi3*kDegrad);
1550
1551     gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1552
1553     // here lower sectors
1554
1555     if(fSecAL <0){
1556
1557       // all lower sectors are positioned
1558
1559       gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1560       gMC->
1561         Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1562     }
1563     else{
1564
1565       // only selected sectors are positioned (up to 6 sectors)
1566
1567       for(Int_t sel=0;sel<6;sel++){
1568
1569         if(fSecLows[sel] == ns){
1570           gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1571         }
1572         else if(fSecLows[sel] == ns+nInnerSector){
1573          gMC->
1574          Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1575         }
1576       }
1577     } // lower sectors finished
1578
1579
1580     xc = rOuter*TMath::Cos(phi3*kDegrad);
1581     yc = rOuter*TMath::Sin(phi3*kDegrad);
1582
1583     gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1584
1585     // here upper sectors
1586
1587     if(fSecAU <0){
1588
1589       // all upper sectors
1590
1591       gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1592       gMC->
1593         Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1594     }
1595     else{
1596
1597       // only selected sectors (up to 12)
1598
1599       for(Int_t sel=0;sel<12;sel++){
1600         if(fSecUps[sel] == ns+2*nInnerSector){
1601           gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.0025,idrotm[nRotMat],"ONLY");
1602         }
1603         else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1604          gMC->
1605           Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.0025,idrotm[nRotMat],"ONLY");
1606         }
1607       }
1608     } // upper sectors finished
1609
1610
1611     nRotMat++;
1612
1613     theta2 = 0.; // reflection
1614
1615     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1616
1617     xc = rInner*TMath::Cos(phi3*kDegrad);
1618     yc = rInner*TMath::Sin(phi3*kDegrad);
1619
1620     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1621
1622     xc = rOuter*TMath::Cos(phi3*kDegrad);
1623     yc = rOuter*TMath::Sin(phi3*kDegrad);
1624
1625     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1626
1627     nRotMat++;
1628
1629   }
1630   // TPMW->TPC
1631
1632   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1633   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[0],"ONLY");
1634
1635   //---------------------------------------------------------
1636   //  Tpc High Voltage Membrane - 100 microns of mylar
1637   //---------------------------------------------------------
1638
1639   dm[0]=82.8;
1640   dm[1]=252.;
1641   dm[2]=0.005;
1642
1643   gMC->Gsvolu("THVM","TUBE",idtmed[8],dm,3);
1644
1645   gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1646
1647   // Tpc High Voltage membrane Holders
1648
1649   gMC->Gsvolu("THVH","TUBE",idtmed[4],dm,0);
1650
1651
1652
1653   // inner
1654
1655   dm[0]=79.3;
1656   dm[1]=82.8;
1657   dm[2]=0.2;
1658
1659   gMC->Gsposp("THVH",1,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1660
1661   // outer
1662
1663   dm[0]= 252.;
1664   dm[1]= 257.9;
1665   dm[2]= 0.4;
1666
1667   gMC->Gsposp("THVH",2,"TDGN",0.,0.,0.,0,"ONLY",dm,3);
1668
1669   //----------------------------------------------------------
1670   // TPc Support Rods - MAKROLON
1671   //----------------------------------------------------------
1672
1673   dm[0]= 0.9;
1674   dm[1]= 1.2;
1675
1676   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,0); // inner and outer rods differ
1677
1678
1679   for(Int_t nrod=0;nrod<18;nrod++){
1680     Float_t angle=innerOpenAngle*(Float_t)nrod;
1681
1682     xc=81.5*TMath::Cos(angle);
1683     yc=81.5*TMath::Sin(angle);
1684
1685     dm[2]=126.7;
1686
1687     gMC->Gsposp("TPSR",nrod+1,"TDGN",xc,yc,126.9,0,"ONLY",dm,3);
1688     gMC->Gsposp("TPSR",nrod+19,"TDGN",xc,yc,-126.9,0,"ONLY",dm,3);
1689
1690     dm[2]=126.6;
1691
1692     xc=254.25*TMath::Cos(angle);
1693     yc=254.25*TMath::Sin(angle);
1694
1695     // rod number 54 contans the HV cable
1696
1697     if(nrod<17) {
1698       gMC->Gsposp("TPSR",nrod+37,"TDGN",xc,yc,127.,0,"ONLY",dm,3);
1699       gMC->Gsposp("TPSR",nrod+54,"TDGN",xc,yc,-127.,0,"ONLY",dm,3);
1700     }
1701
1702   }
1703
1704   //----------------------------------------------------------
1705   // Tpc High Voltage Rod - MAKROLON + Copper cable
1706   //----------------------------------------------------------
1707
1708   // rod with cable (Left)
1709
1710   dm[0]=0.;
1711   dm[1]=2.25;
1712   dm[2]=126.6;
1713
1714   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1715
1716   // HV cable
1717
1718   dm[0]=0.;
1719   dm[1]=0.3;
1720   dm[2]=126.6;
1721
1722   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1723
1724   // empty space
1725
1726   dm[0]=0.3;
1727   dm[1]=1.;
1728   dm[2]=126.6;
1729
1730   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1731
1732   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1733   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1734
1735   // rod without cable
1736
1737   dm[0]=1.8;
1738   dm[1]=2.25;
1739   dm[2]=126.6;
1740
1741   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1742
1743   gMC->Gspos("THVL",1,"TDGN",xc,yc,-127.,0,"ONLY");
1744   gMC->Gspos("THVR",1,"TDGN",xc,yc,127.,0,"ONLY");
1745
1746   gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY");
1747
1748   // services wheel cover -> wheel
1749
1750
1751   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1752   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1753
1754
1755   // put the wheel into the TPC
1756
1757   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1758   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1759
1760   //
1761
1762   gMC->Gsord("TPMW",6);
1763   gMC->Gsord("TSSW",6);
1764   gMC->Gsord("TSWC",6);
1765   if(fSecAL >=0)  gMC->Gsord("TPLS",3);
1766   if(fSecAU >=0 && fSens >0)  gMC->Gsord("TPUS",3);
1767   gMC->Gsord("TDGN",6);
1768
1769   // put the TPC into ALIC (main mother volume)
1770
1771   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1772
1773
1774
1775 } // end of function
1776
1777 //_____________________________________________________________________________
1778 void AliTPCv2::DrawDetector()
1779 {
1780   //
1781   // Draw a shaded view of the Time Projection Chamber version 1
1782   //
1783
1784   // Set everything unseen
1785   gMC->Gsatt("*", "seen", -1);
1786   //
1787   // Set ALIC mother transparent
1788   gMC->Gsatt("ALIC","SEEN",0);
1789   //
1790   // Set the volumes visible
1791   //
1792
1793   gMC->Gsatt("TPC ","SEEN",0);
1794   gMC->Gsatt("TOIN","SEEN",1);
1795   gMC->Gsatt("TOIN","COLO",7);
1796   gMC->Gsatt("TOCV","SEEN",1);
1797   gMC->Gsatt("TOCV","COLO",4);
1798   gMC->Gsatt("TSA1","SEEN",0);
1799   gMC->Gsatt("TSA2","SEEN",0);
1800   gMC->Gsatt("TSA3","SEEN",0);
1801   gMC->Gsatt("TSA4","SEEN",0);
1802   gMC->Gsatt("TSA5","SEEN",0);
1803   gMC->Gsatt("TOFC","SEEN",1);
1804   gMC->Gsatt("TOFC","COLO",4);
1805   gMC->Gsatt("TSA6","SEEN",0);
1806   gMC->Gsatt("TSA7","SEEN",0);
1807   gMC->Gsatt("TSA8","SEEN",0);
1808   gMC->Gsatt("TIIN","SEEN",1);
1809   gMC->Gsatt("TIIN","COLO",7);
1810   gMC->Gsatt("TII1","SEEN",0);
1811   gMC->Gsatt("TIFC","SEEN",1);
1812   gMC->Gsatt("TIFC","COLO",4);
1813   gMC->Gsatt("TSA9","SEEN",0);
1814   gMC->Gsatt("TS10","SEEN",0);
1815   gMC->Gsatt("TS11","SEEN",0);
1816   gMC->Gsatt("TS12","SEEN",0);
1817   gMC->Gsatt("TS13","SEEN",0);
1818   gMC->Gsatt("TS14","SEEN",0);
1819   gMC->Gsatt("TICC","SEEN",0);
1820   gMC->Gsatt("TICM","SEEN",0);
1821   gMC->Gsatt("TS15","SEEN",0);
1822   gMC->Gsatt("TS16","SEEN",0);
1823   gMC->Gsatt("TS17","SEEN",0);
1824   gMC->Gsatt("TS18","SEEN",0);
1825   gMC->Gsatt("TS19","SEEN",0);
1826   gMC->Gsatt("TPJ1","SEEN",0);
1827   gMC->Gsatt("TPJ2","SEEN",0);
1828   gMC->Gsatt("TICS","SEEN",0);
1829   gMC->Gsatt("TDGN","SEEN",0);
1830   gMC->Gsatt("TIRC","SEEN",0);
1831   gMC->Gsatt("TIC1","SEEN",1);
1832   gMC->Gsatt("TIPP","SEEN",0);
1833   gMC->Gsatt("TIC3","SEEN",0);
1834   gMC->Gsatt("TRCE","SEEN",0);
1835   gMC->Gsatt("TPSC","SEEN",0);
1836   gMC->Gsatt("TPCC","SEEN",0);
1837   gMC->Gsatt("TORC","SEEN",0);
1838   gMC->Gsatt("TOPP","SEEN",0);
1839   gMC->Gsatt("TOC3","SEEN",0);
1840   gMC->Gsatt("TOC1","SEEN",1);
1841   gMC->Gsatt("TSSW","SEEN",1);
1842   gMC->Gsatt("TSWC","SEEN",1);
1843   gMC->Gsatt("TSSW","COLO",3);
1844   gMC->Gsatt("TSWC","COLO",3);
1845   gMC->Gsatt("TSCE","COLO",6);
1846   gMC->Gsatt("TSCE","SEEN",1);
1847   gMC->Gsatt("TWES","SEEN",0);
1848   gMC->Gsatt("TSWB","SEEN",0);
1849   gMC->Gsatt("TPEL","SEEN",0);
1850   gMC->Gsatt("TPMW","SEEN",1);
1851   gMC->Gsatt("TESR","SEEN",1);
1852   gMC->Gsatt("TPMW","COLO",12);
1853   gMC->Gsatt("TIC1","COLO",5);
1854   gMC->Gsatt("TOC1","COLO",5);
1855   gMC->Gsatt("TESB","SEEN",0);
1856   gMC->Gsatt("THVM","SEEN",1);
1857   gMC->Gsatt("THVM","COLO",11);
1858   gMC->Gsatt("THVH","SEEN",0);
1859   gMC->Gsatt("TPSR","SEEN",0);
1860   gMC->Gsatt("THVL","SEEN",0);
1861   gMC->Gsatt("THVC","SEEN",0);
1862   gMC->Gsatt("THVE","SEEN",0);
1863   gMC->Gsatt("THVR","SEEN",0);
1864   gMC->Gsatt("TPSS","SEEN",0);
1865   gMC->Gsatt("TPUS","SEEN",0);
1866   gMC->Gsatt("TPLS","SEEN",0);
1867
1868   //
1869   gMC->Gdopt("hide", "on");
1870   gMC->Gdopt("shad", "on");
1871   gMC->Gsatt("*", "fill", 7);
1872   gMC->SetClipBox(".");
1873   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1874   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1875   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1876   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1877   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1878   gMC->DefaultRange();
1879   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1880   gMC->Gdhead(1111, "Time Projection Chamber");
1881   gMC->Gdman(18, 4, "MAN");
1882   gMC->Gdopt("hide","off");
1883 }
1884
1885 //_____________________________________________________________________________
1886 void AliTPCv2::CreateMaterials()
1887 {
1888   //
1889   // Define materials for version 2 of the Time Projection Chamber
1890   //
1891
1892   AliTPC::CreateMaterials();
1893 }
1894
1895 //_____________________________________________________________________________
1896 void AliTPCv2::Init()
1897 {
1898   //
1899   // Initialises version 2 of the TPC after that it has been built
1900   //
1901
1902   Int_t *idtmed = fIdtmed->GetArray();
1903
1904   AliTPC::Init();
1905
1906
1907
1908   fIdSens=gMC->VolId("TPSS");
1909
1910   fIdLSec=gMC->VolId("TPLS"); // lower sector
1911   fIdUSec=gMC->VolId("TPUS"); // upper sector
1912
1913   gMC->SetMaxNStep(30000); // max. number of steps increased
1914
1915   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1916
1917   printf("%s: *** TPC version 2 initialized ***\n",ClassName());
1918   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1919
1920   //
1921
1922 }
1923
1924 //_____________________________________________________________________________
1925 void AliTPCv2::StepManager()
1926 {
1927   //
1928   // Called for every step in the Time Projection Chamber
1929   //
1930
1931   //
1932   // parameters used for the energy loss calculations
1933   //
1934   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1935   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1936   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1937
1938
1939   const Float_t kbig = 1.e10;
1940
1941   Int_t id,copy;
1942   Float_t hits[4];
1943   Int_t vol[2];
1944   TLorentzVector p;
1945
1946   vol[1]=0; // preset row number to 0
1947
1948   //
1949
1950   gMC->SetMaxStep(kbig);
1951
1952   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1953
1954   Float_t charge = gMC->TrackCharge();
1955
1956   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1957
1958   // check the sensitive volume
1959
1960   id = gMC->CurrentVolID(copy); // current volume Id
1961
1962   if(id == fIdLSec){
1963     vol[0] = copy-1; // lower sector number
1964   }
1965   else if(id == fIdUSec){
1966     vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
1967   }
1968   else if(id == fIdSens && gMC->IsTrackEntering()){
1969
1970     // track is entering the sensitive strip
1971
1972     vol[1]= copy-1; // row number (absolute)
1973
1974     // sector type
1975
1976     id = gMC->CurrentVolOffID(1,copy);
1977
1978     if(id == fIdLSec){
1979
1980       // lower sector
1981
1982       vol[0] = copy-1; // sector number
1983
1984     }
1985     else {
1986
1987       // upper sector
1988
1989       vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
1990       vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)
1991
1992     }
1993
1994     if(vol[1] == 0){
1995
1996       // because Jouri wants to have this
1997
1998       gMC->TrackMomentum(p);
1999       hits[0]=p[0];
2000       hits[1]=p[1];
2001       hits[2]=p[2];
2002       hits[3]=0.; // this hit has no energy loss
2003       // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2004
2005       AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2006
2007     }
2008
2009      gMC->TrackPosition(p);
2010      hits[0]=p[0];
2011      hits[1]=p[1];
2012      hits[2]=p[2];
2013      hits[3]=0.; // this hit has no energy loss
2014      // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2015
2016      AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2017
2018   }
2019   else return;
2020
2021   //-----------------------------------------------------------------
2022   //  charged particle is in the sensitive volume
2023   //-----------------------------------------------------------------
2024
2025   if(gMC->TrackStep() > 0) {
2026
2027     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2028     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2029
2030     gMC->TrackPosition(p);
2031     hits[0]=p[0];
2032     hits[1]=p[1];
2033     hits[2]=p[2];
2034     hits[3]=(Float_t)nel;
2035
2036     // Add this hit
2037
2038     // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2039     if (fHitType&&2){
2040       gMC->TrackMomentum(p);
2041       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2042       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
2043       fTrackHits->SetHitPrecision(precision);
2044     }
2045     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2046
2047   }
2048
2049   // Stemax calculation for the next step
2050
2051   Float_t pp;
2052   TLorentzVector mom;
2053   gMC->TrackMomentum(mom);
2054   Float_t ptot=mom.Rho();
2055   Float_t betaGamma = ptot/gMC->TrackMass();
2056
2057   Int_t pid=gMC->TrackPid();
2058   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2059     {
2060       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2061     }
2062   else
2063     {
2064
2065       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
2066       pp=kprim*BetheBloch(betaGamma);
2067
2068       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2069     }
2070
2071   Float_t random[1];
2072   gMC->Rndm(random,1); // good, old GRNDM from Geant3
2073
2074   Double_t rnd = (Double_t)random[0];
2075
2076   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2077
2078 }
2079
2080 //_____________________________________________________________________________
2081 Float_t AliTPCv2::BetheBloch(Float_t bg)
2082 {
2083   //
2084   // Bethe-Bloch energy loss formula
2085   //
2086   const Double_t kp1=0.76176e-1;
2087   const Double_t kp2=10.632;
2088   const Double_t kp3=0.13279e-4;
2089   const Double_t kp4=1.8631;
2090   const Double_t kp5=1.9479;
2091
2092   Double_t dbg = (Double_t) bg;
2093
2094   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2095
2096   Double_t aa = TMath::Power(beta,kp4);
2097   Double_t bb = TMath::Power(1./dbg,kp5);
2098
2099   bb=TMath::Log(kp3+bb);
2100
2101   return ((Float_t)((kp2-aa-bb)*kp1/aa));
2102 }
2103
2104