TPC/AliTPCv0.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 1.12  1999/10/08 06:27:23  fca
  19 Corrected bug in the HV degrader geometry, thanks to G.Tabary
  20
  21 Revision 1.11  1999/10/04 13:39:54  fca
  22 Correct array index problem
  23
  24 Revision 1.10  1999/09/29 09:24:34  fca
  25 Introduction of the Copyright and cvs Log
  26
  27 */
  28
  29 ///////////////////////////////////////////////////////////////////////////////
  30 //                                                                           //
  31 //  Time Projection Chamber version 0 -- "coarse" TPC                        //
  32 //                                                                           //
  33 //Begin_Html
  34 /*
  35 <img src="picts/AliTPCv0Class.gif">
  36 */
  37 //End_Html
  38 //                                                                           //
  39 //                                                                           //
  40 ///////////////////////////////////////////////////////////////////////////////
  41
  42 #include <TMath.h>
  43 #include <TGeometry.h>
  44 #include <TNode.h>
  45 #include <TTUBE.h>
  46 #include "AliTPCv0.h"
  47 #include "AliRun.h"
  48 #include <iostream.h>
  49 #include <fstream.h>
  50
  51 #include "AliMC.h"
  52 #include "AliConst.h"
  53
  54 #include "AliTPCParam.h"
  55 #include "AliTPCD.h"
  56
  57 ClassImp(AliTPCv0)
  58
  59 //_____________________________________________________________________________
  60 AliTPCv0::AliTPCv0(const char *name, const char *title)
  61          :AliTPC(name, title)
  62 {
  63   //
  64   // Standard creator for TPC version 0
  65   //
  66 }
  67
  68 //_____________________________________________________________________________
  69 void AliTPCv0::CreateGeometry()
  70 {
  71   //
  72   // Creation of the TPC coarse geometry (version 0)
  73   // Origin Marek Kowalski Crakow
  74   //
  75   //Begin_Html
  76   /*
  77     <img src="picts/AliTPCv0.gif">
  78   */
  79   //End_Html
  80   //Begin_Html
  81   /*
  82     <img src="picts/AliTPCv0Tree.gif">
  83   */
  84   //End_Html
  85
  86   AliTPCParam * fTPCParam = &(fDigParam->GetParam());
  87
  88   Int_t *idtmed = fIdtmed->GetArray();
  89
  90   Float_t dm[21];
  91   Int_t idrotm[120];
  92
  93   Int_t nRotMat = 0;
  94
  95
  96   // ----------------------------------------------------
  97   //          FIELD CAGE WITH ENDCAPS - G10
  98   //          THIS IS ALSO A TPC MOTHER VOLUME
  99   // ----------------------------------------------------
 100
 101   dm[0] = 76.;
 102   dm[1] = 278.;
 103   dm[2] = 275.;
 104
 105   gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3);
 106
 107   //-----------------------------------------------------
 108   //  Endcap cover c-fibre 0.86% X0
 109   //-----------------------------------------------------
 110
 111   dm[0] = 78.;
 112   dm[1] = 258.;
 113   dm[2] = 0.95;
 114
 115   gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3);
 116
 117   //-----------------------------------------------------
 118   // Drift gas , leave 2 cm at the outer radius
 119   // and inner raddius
 120   //-----------------------------------------------------
 121
 122   dm[0] = 78.;
 123   dm[1] = 258.;
 124   dm[2] = 250.;
 125
 126   gMC->Gsvolu("TGAS", "TUBE", idtmed[3], dm, 3);
 127
 128
 129   //------------------------------------------------------
 130   //  membrane holder - carbon fiber
 131   //------------------------------------------------------
 132
 133
 134   gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0);
 135
 136   dm[0] = 252.;
 137   dm[1] = 258.;
 138   dm[2] = 0.2;
 139
 140   gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
 141
 142   dm[0] = 78.;
 143   dm[1] = 82.;
 144   dm[2] = 0.1;
 145
 146   gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
 147
 148   //----------------------------------------------------------
 149   //  HV membrane - 25 microns of mylar
 150   //----------------------------------------------------------
 151
 152   dm[0] = 82.;
 153   dm[1] = 252.;
 154   dm[2] = 0.00125;
 155
 156   gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3);
 157
 158   gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY");
 159
 160   gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY");
 161
 162   //----------------------------------------------------------
 163   // "side" gas volume, the same as the drift gas
 164   // the readout chambers are placed there.
 165   //----------------------------------------------------------
 166
 167   dm[0] = 78.;
 168   dm[1] = 258.;
 169   dm[2] = 0.5*(275. - 250.);
 170
 171   gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3);
 172
 173   Float_t z_side = dm[2]; // 1/2 of the side gas thickness
 174
 175   //-----------------------------------------------------------
 176   //   Readout chambers , 25% of X0, I use Al as the material
 177   //-----------------------------------------------------------
 178
 179   Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
 180   Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
 181
 182   Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
 183   Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
 184
 185
 186   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 187   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 188
 189
 190   Float_t InSecLowEdge = fTPCParam->GetInSecLowEdge();
 191   Float_t InSecUpEdge =  fTPCParam->GetInSecUpEdge();
 192
 193   Float_t OuSecLowEdge = fTPCParam->GetOuSecLowEdge();
 194   Float_t OuSecUpEdge = fTPCParam->GetOuSecUpEdge();
 195
 196   Float_t SecThick = 2.225; // Al
 197
 198   Float_t edge = fTPCParam->GetEdge();
 199
 200   //  S (Inner) sectors
 201
 202   dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
 203   dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
 204   dm[2] = SecThick;
 205   dm[3] = 0.5*(InSecUpEdge-InSecLowEdge);
 206
 207   Float_t xCenterS = InSecLowEdge+dm[3];
 208
 209   gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4);
 210
 211   //  L (Outer) sectors
 212
 213   dm[0] = OuSecLowEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
 214   dm[1] = OuSecUpEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
 215   dm[2] = SecThick;
 216   dm[3] = 0.5*(OuSecUpEdge-OuSecLowEdge);
 217
 218   Float_t xCenterL = OuSecLowEdge+dm[3];
 219
 220   gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4);
 221
 222   Float_t z1 = -z_side + SecThick*0.5;
 223
 224   //------------------------------------------------------------------
 225   // Positioning of the S-sector readout chambers
 226   //------------------------------------------------------------------
 227
 228   Int_t ns;
 229   Float_t theta1,theta2,theta3;
 230   Float_t phi1,phi2,phi3;
 231   Float_t alpha;
 232   Float_t x,y;
 233
 234   for(ns=0;ns<nInnerSector;ns++){
 235
 236     phi1 = ns * InnerOpenAngle + 270.*kDegrad + InnerAngleShift;
 237     phi1 *= kRaddeg; // in degrees
 238
 239     phi1 = (Float_t)TMath::Nint(phi1);
 240
 241     if (phi1 > 360.) phi1 -= 360.;
 242
 243     theta1 = 90.;
 244     phi2   = 90.;
 245     theta2 = 180.;
 246     phi3   = ns * InnerOpenAngle + InnerAngleShift;
 247     phi3 *= kRaddeg; // in degrees
 248
 249     phi3 = (Float_t)TMath::Nint(phi3);
 250
 251     if(phi3 > 360.) phi3 -= 360.;
 252
 253     theta3 = 90.;
 254
 255     alpha = phi3*kDegrad;
 256
 257     x = xCenterS * TMath::Cos(alpha);
 258     y = xCenterS * TMath::Sin(alpha);
 259
 260     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 261
 262     gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
 263
 264     nRotMat++;
 265
 266   }
 267
 268   //-------------------------------------------------------------------
 269   //  Positioning of the L-sectors readout chambers
 270   //-------------------------------------------------------------------
 271
 272   for(ns=0;ns<nOuterSector;ns++){
 273     phi1 = ns * OuterOpenAngle + 270.*kDegrad + OuterAngleShift;
 274     phi1 *= kRaddeg; // in degrees
 275
 276     phi1 = (Float_t)TMath::Nint(phi1);
 277
 278
 279     if (phi1 > 360.) phi1 -= 360.;
 280
 281     theta1 = 90.;
 282     phi2   = 90.;
 283     theta2 = 180.;
 284     phi3   = ns * OuterOpenAngle+OuterAngleShift;
 285     phi3 *= kRaddeg; // in degrees
 286
 287     phi3 = (Float_t)TMath::Nint(phi3);
 288
 289
 290     if(phi3 > 360.) phi3 -= 360.;
 291
 292     theta3 = 90.;
 293
 294     alpha = phi3*kDegrad;
 295
 296     x = xCenterL * TMath::Cos(alpha);
 297     y = xCenterL * TMath::Sin(alpha);
 298
 299     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 300
 301
 302     gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
 303
 304     nRotMat++;
 305
 306   }
 307
 308   Float_t z0 = z_side - 0.95;
 309
 310   gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY");
 311
 312   // ==========================================================
 313   //                  wheels
 314   // ==========================================================
 315
 316   //
 317   //  auxilary structures
 318   //
 319
 320
 321   gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air"
 322
 323   // ----------------------------------------------------------
 324   //       Large wheel -> positioned in the TPC
 325   // ----------------------------------------------------------
 326
 327
 328   z0 = 263.5; // TPC length - 1/2 spoke wheel width
 329
 330   dm[0] = 258.;
 331   dm[1] = 278.;
 332   dm[2] = 11.5;
 333
 334   gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3);
 335
 336   dm[0] = dm[0]+2.;
 337   dm[1] = 278.;
 338   dm[2] = dm[2]-2.;
 339
 340   gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3);
 341
 342   gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY");
 343   gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY");
 344
 345   //
 346   //  Outer vessel + CO2 HV degrader
 347   //
 348
 349   dm[0] = 260.;
 350   dm[1] = 278.;
 351   dm[2] = 252.;
 352
 353   gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3);
 354
 355   dm[0] = 275.;
 356   dm[1] = 278.;
 357
 358   gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3);
 359
 360   gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY");
 361
 362
 363   // G10 plugs
 364
 365   dm[0] = 258.;
 366   dm[1] = 260.;
 367   dm[2] = 1.;
 368
 369   gMC->Gsvolu("TPG1","TUBE",idtmed[8],dm,3);
 370   gMC->Gspos("TPG1",1,"TPCO",0.,0.,251.,0,"ONLY");
 371   gMC->Gspos("TPG1",2,"TPCO",0.,0.,-251.,0,"ONLY");
 372
 373   gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY");
 374
 375
 376   //----------------------------------------------------------
 377   //  Small wheel -> positioned in "side gas
 378   //----------------------------------------------------------
 379
 380   dm[0] = 78.;
 381   dm[1] = 82.;
 382   dm[2] = 11.5;
 383
 384   gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3);
 385
 386   dm[0] = 78.;
 387   dm[1] = dm[1]-2;
 388   dm[2] = dm[2]-2.;
 389
 390   gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3);
 391
 392   gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY");
 393
 394   z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas"
 395
 396   gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY");
 397
 398
 399   // to avoid overlaps
 400
 401   dm[0] = 76.;
 402   dm[1] = 78.;
 403   dm[2] = 11.5;
 404
 405   gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3);
 406
 407   dm[2] = 9.5;
 408
 409   gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3);
 410
 411   gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY");
 412
 413   z0= 263.5;
 414
 415   gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY");
 416   gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY");
 417
 418   // G10 plug
 419
 420   dm[0] = 76.;
 421   dm[1] = 78.;
 422   dm[2] = 1.;
 423
 424   gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3);
 425
 426   z0 = 251.;
 427
 428   gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY");
 429   gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY");
 430
 431
 432   //---------------------------------------------------------
 433   //  central wheel  6 (radial direction) x 4 (along z) cm2
 434   //---------------------------------------------------------
 435
 436   dm[0] = 140.;
 437   dm[1] = 146.;
 438   dm[2] = 2.;
 439
 440   gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3);
 441
 442   dm[0] = dm[0] + 2.;
 443   dm[1] = dm[1] - 2.;
 444   dm[2] = dm[2] - 1.;
 445
 446   gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3);
 447
 448   z0 = z_side - 1.9 - 2.;
 449
 450   gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY");
 451
 452   //
 453
 454   gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke
 455
 456
 457   //---------------------------------------------------------
 458   //  inner spokes (nSectorInner)
 459   //---------------------------------------------------------
 460
 461   dm[0] = 0.5*(139.9-82.1);
 462   dm[1] = 3.;
 463   dm[2] = 2.;
 464
 465   Float_t x1 = dm[0]+82.;
 466
 467   gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3);
 468
 469   dm[1] = dm[1]-1.;
 470   dm[2] = dm[2]-1.;
 471
 472   gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3);
 473
 474   for(ns=0;ns<nInnerSector;ns++){
 475
 476     phi1 = 0.5*InnerOpenAngle + ns*InnerOpenAngle + InnerAngleShift;
 477     theta1=90.;
 478     phi1 *=kRaddeg;
 479
 480     phi1 = (Float_t)TMath::Nint(phi1);
 481
 482     phi2 = phi1+90.;
 483     if(phi2>360.) phi2 -= 360.;
 484     theta2=90.;
 485     phi3=0.;
 486     theta3=0.;
 487
 488     alpha = phi1 * kDegrad;
 489     x     = x1 * TMath::Cos(alpha);
 490     y     = x1 * TMath::Sin(alpha);
 491
 492    AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
 493
 494    gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
 495
 496    nRotMat++;
 497
 498   }
 499
 500   //-------------------------------------------------------------
 501   // outer spokes (nSectorOuter)
 502   //-------------------------------------------------------------
 503
 504   dm[0] = 0.5*(257.9-146.1);
 505   dm[1] = 3.;
 506   dm[2] = 2.;
 507
 508   x1 = dm[0] + 146.;
 509
 510   gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3);
 511
 512   dm[1] = dm[1] - 1.;
 513   dm[2] = dm[2] - 1.;
 514
 515   gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3);
 516
 517   for(ns=0;ns<nOuterSector;ns++){
 518
 519     phi1 = 0.5*OuterOpenAngle + ns*OuterOpenAngle + OuterAngleShift;
 520     theta1=90.;
 521     phi1 *=kRaddeg;
 522
 523     phi1 = (Float_t)TMath::Nint(phi1);
 524
 525     phi2 = phi1+90.;
 526     if(phi2>360.) phi2 -= 360.;
 527     theta2=90.;
 528     phi3=0.;
 529     theta3=0.;
 530
 531     alpha = phi1 * kDegrad;
 532     x     = x1 * TMath::Cos(alpha);
 533     y     = x1 * TMath::Sin(alpha);
 534
 535    AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
 536
 537    gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
 538
 539    nRotMat++;
 540
 541   }
 542
 543
 544
 545   // --------------------------------------------------------
 546   //         put the readout chambers into the TPC
 547   // --------------------------------------------------------
 548
 549   theta1 = 90.;
 550   phi1   = 0.;
 551   theta2 = 90.;
 552   phi2   = 270.;
 553   theta3 = 180.;
 554   phi3   = 0.;
 555
 556   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 557
 558   z0 = z_side + 250.;
 559
 560   gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY");
 561   gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY");
 562
 563   gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
 564
 565   //----------------------------------------------------
 566   //  Inner vessel and HV degrader
 567   //----------------------------------------------------
 568
 569   dm[0] = 0.;
 570   dm[1] = 360.;
 571   dm[2] = 4.;
 572
 573   dm[3] = -250.;
 574   dm[4] = 74.4;
 575   dm[5] = 76.;
 576
 577   dm[6] = -64.5;
 578   dm[7] = 50.;
 579   dm[8] = 76.;
 580
 581   dm[9] = 64.5;
 582   dm[10] = 50.;
 583   dm[11] = 76.;
 584
 585   dm[12] = 250.;
 586   dm[13] = 74.4;
 587   dm[14] = 76.;
 588
 589   gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2
 590
 591   // cone parts
 592
 593   dm[0] = 0.;
 594   dm[1] = 360.;
 595   dm[2] = 2.;
 596
 597   dm[3] = 64.5;
 598   dm[4] = 50.;
 599   dm[5] = 51.6;
 600
 601   dm[6] = 250.;
 602   dm[7] = 74.4;
 603   dm[8] = 76.;
 604
 605
 606   gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre
 607
 608   gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY");
 609   gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY");
 610
 611   // barrel part
 612
 613   dm[0] = 50.;
 614   dm[1] = 50.5;
 615   dm[2] = 64.5;
 616
 617   gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3);
 618
 619   gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY");
 620
 621   gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY");
 622
 623
 624
 625
 626
 627   // ---------------------------------------------------
 628   //               volumes ordering
 629   // ---------------------------------------------------
 630   gMC->Gsord("TPSG", 6);
 631
 632 } // end of function
 633
 634
 635 //_____________________________________________________________________________
 636 void AliTPCv0::CreateMaterials()
 637 {
 638   //
 639   // Define materials for the TPC
 640   //
 641   AliTPC::CreateMaterials();
 642 }
 643
 644 //_____________________________________________________________________________
 645 void AliTPCv0::DrawDetector()
 646 {
 647   //
 648   // Draw a shaded view of the Time Projection Chamber version 0
 649   //
 650
 651   // Set everything unseen
 652   gMC->Gsatt("*", "seen", -1);
 653   //
 654   // Set ALIC mother transparent
 655   gMC->Gsatt("ALIC","SEEN",0);
 656   //
 657   // Set the volumes visible
 658   gMC->Gsatt("TPC","SEEN",0);
 659   gMC->Gsatt("TGAS","SEEN",0);
 660   gMC->Gsatt("TPSG","SEEN",0);
 661   gMC->Gsatt("TPHV","SEEN",1);
 662   gMC->Gsatt("TPMH","SEEN",1);
 663   gMC->Gsatt("TPEC","SEEN",0);
 664   gMC->Gsatt("TRCS","SEEN",1);
 665   gMC->Gsatt("TRCL","SEEN",1);
 666   gMC->Gsatt("TPWL","SEEN",1);
 667   gMC->Gsatt("TPWI","SEEN",1);
 668   gMC->Gsatt("TPWS","SEEN",1);
 669   gMC->Gsatt("TPW1","SEEN",1);
 670   gMC->Gsatt("TPS1","SEEN",1);
 671   gMC->Gsatt("TPS2","SEEN",1);
 672   gMC->Gsatt("TPG1","SEEN",1);
 673   gMC->Gsatt("TPG2","SEEN",1);
 674   gMC->Gsatt("TPWC","SEEN",1);
 675   gMC->Gsatt("TPSI","SEEN",1);
 676   gMC->Gsatt("TPSO","SEEN",1);
 677   gMC->Gsatt("TPCO","SEEN",1);
 678   gMC->Gsatt("TPOV","SEEN",1);
 679   gMC->Gsatt("TPVD","SEEN",1);
 680   //
 681   gMC->Gdopt("hide", "on");
 682   gMC->Gdopt("shad", "on");
 683   gMC->Gsatt("*", "fill", 7);
 684   gMC->SetClipBox(".");
 685   gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
 686   gMC->DefaultRange();
 687   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
 688   gMC->Gdhead(1111, "Time Projection Chamber");
 689   gMC->Gdman(18, 4, "MAN");
 690   gMC->Gdopt("hide","off");
 691 }
 692
 693 //_____________________________________________________________________________
 694 void AliTPCv0::Init()
 695 {
 696   //
 697   // Initialise Time Projection Chamber version 0
 698   //
 699   printf("TPC version 0 initialized\n");
 700 }
 701
 702 //_____________________________________________________________________________
 703 void AliTPCv0::StepManager()
 704 {
 705   //
 706   // Procedure called at each step in the TPC
 707   //
 708 }