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