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