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 1.11  1999/10/04 13:39:54  fca
  19 Correct array index problem
  20
  21 Revision 1.10  1999/09/29 09:24:34  fca
  22 Introduction of the Copyright and cvs Log
  23
  24 */
  25
  26 ///////////////////////////////////////////////////////////////////////////////
  27 //                                                                           //
  28 //  Time Projection Chamber version 0 -- "coarse" TPC                        //
  29 //                                                                           //
  30 //Begin_Html
  31 /*
  32 <img src="picts/AliTPCv0Class.gif">
  33 */
  34 //End_Html
  35 //                                                                           //
  36 //                                                                           //
  37 ///////////////////////////////////////////////////////////////////////////////
  38
  39 #include <TMath.h>
  40 #include <TGeometry.h>
  41 #include <TNode.h>
  42 #include <TTUBE.h>
  43 #include "AliTPCv0.h"
  44 #include "AliRun.h"
  45 #include <iostream.h>
  46 #include <fstream.h>
  47
  48 #include "AliMC.h"
  49 #include "AliConst.h"
  50
  51 #include "AliTPCParam.h"
  52 #include "AliTPCD.h"
  53
  54 ClassImp(AliTPCv0)
  55
  56 //_____________________________________________________________________________
  57 AliTPCv0::AliTPCv0(const char *name, const char *title)
  58          :AliTPC(name, title)
  59 {
  60   //
  61   // Standard creator for TPC version 0
  62   //
  63 }
  64
  65 //_____________________________________________________________________________
  66 void AliTPCv0::CreateGeometry()
  67 {
  68   //
  69   // Creation of the TPC coarse geometry (version 0)
  70   // Origin Marek Kowalski Crakow
  71   //
  72   //Begin_Html
  73   /*
  74     <img src="picts/AliTPCv0.gif">
  75   */
  76   //End_Html
  77   //Begin_Html
  78   /*
  79     <img src="picts/AliTPCv0Tree.gif">
  80   */
  81   //End_Html
  82
  83   AliTPCParam * fTPCParam = &(fDigParam->GetParam());
  84
  85   Int_t *idtmed = fIdtmed->GetArray();
  86
  87   Float_t dm[21];
  88   Int_t idrotm[120];
  89
  90   Int_t nRotMat = 0;
  91
  92
  93   // ----------------------------------------------------
  94   //          FIELD CAGE WITH ENDCAPS - G10
  95   //          THIS IS ALSO A TPC MOTHER VOLUME
  96   // ----------------------------------------------------
  97
  98   dm[0] = 76.;
  99   dm[1] = 278.;
 100   dm[2] = 275.;
 101
 102   gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3);
 103
 104   //-----------------------------------------------------
 105   //  Endcap cover c-fibre 0.86% X0
 106   //-----------------------------------------------------
 107
 108   dm[0] = 78.;
 109   dm[1] = 258.;
 110   dm[2] = 0.95;
 111
 112   gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3);
 113
 114   //-----------------------------------------------------
 115   // Drift gas , leave 2 cm at the outer radius
 116   // and inner raddius
 117   //-----------------------------------------------------
 118
 119   dm[0] = 78.;
 120   dm[1] = 258.;
 121   dm[2] = 250.;
 122
 123   gMC->Gsvolu("TGAS", "TUBE", idtmed[3], dm, 3);
 124
 125
 126   //------------------------------------------------------
 127   //  membrane holder - carbon fiber
 128   //------------------------------------------------------
 129
 130
 131   gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0);
 132
 133   dm[0] = 252.;
 134   dm[1] = 258.;
 135   dm[2] = 0.2;
 136
 137   gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
 138
 139   dm[0] = 78.;
 140   dm[1] = 82.;
 141   dm[2] = 0.1;
 142
 143   gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
 144
 145   //----------------------------------------------------------
 146   //  HV membrane - 25 microns of mylar
 147   //----------------------------------------------------------
 148
 149   dm[0] = 82.;
 150   dm[1] = 252.;
 151   dm[2] = 0.00125;
 152
 153   gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3);
 154
 155   gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY");
 156
 157   gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY");
 158
 159   //----------------------------------------------------------
 160   // "side" gas volume, the same as the drift gas
 161   // the readout chambers are placed there.
 162   //----------------------------------------------------------
 163
 164   dm[0] = 78.;
 165   dm[1] = 258.;
 166   dm[2] = 0.5*(275. - 250.);
 167
 168   gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3);
 169
 170   Float_t z_side = dm[2]; // 1/2 of the side gas thickness
 171
 172   //-----------------------------------------------------------
 173   //   Readout chambers , 25% of X0, I use Al as the material
 174   //-----------------------------------------------------------
 175
 176   Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
 177   Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
 178
 179   Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
 180   Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
 181
 182
 183   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
 184   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
 185
 186
 187   Float_t InSecLowEdge = fTPCParam->GetInSecLowEdge();
 188   Float_t InSecUpEdge =  fTPCParam->GetInSecUpEdge();
 189
 190   Float_t OuSecLowEdge = fTPCParam->GetOuSecLowEdge();
 191   Float_t OuSecUpEdge = fTPCParam->GetOuSecUpEdge();
 192
 193   Float_t SecThick = 2.225; // Al
 194
 195   Float_t edge = fTPCParam->GetEdge();
 196
 197   //  S (Inner) sectors
 198
 199   dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
 200   dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
 201   dm[2] = SecThick;
 202   dm[3] = 0.5*(InSecUpEdge-InSecLowEdge);
 203
 204   Float_t xCenterS = InSecLowEdge+dm[3];
 205
 206   gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4);
 207
 208   //  L (Outer) sectors
 209
 210   dm[0] = OuSecLowEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
 211   dm[1] = OuSecUpEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
 212   dm[2] = SecThick;
 213   dm[3] = 0.5*(OuSecUpEdge-OuSecLowEdge);
 214
 215   Float_t xCenterL = OuSecLowEdge+dm[3];
 216
 217   gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4);
 218
 219   Float_t z1 = -z_side + SecThick*0.5;
 220
 221   //------------------------------------------------------------------
 222   // Positioning of the S-sector readout chambers
 223   //------------------------------------------------------------------
 224
 225   Int_t ns;
 226   Float_t theta1,theta2,theta3;
 227   Float_t phi1,phi2,phi3;
 228   Float_t alpha;
 229   Float_t x,y;
 230
 231   for(ns=0;ns<nInnerSector;ns++){
 232
 233     phi1 = ns * InnerOpenAngle + 270.*kDegrad + InnerAngleShift;
 234     phi1 *= kRaddeg; // in degrees
 235
 236     phi1 = (Float_t)TMath::Nint(phi1);
 237
 238     if (phi1 > 360.) phi1 -= 360.;
 239
 240     theta1 = 90.;
 241     phi2   = 90.;
 242     theta2 = 180.;
 243     phi3   = ns * InnerOpenAngle + InnerAngleShift;
 244     phi3 *= kRaddeg; // in degrees
 245
 246     phi3 = (Float_t)TMath::Nint(phi3);
 247
 248     if(phi3 > 360.) phi3 -= 360.;
 249
 250     theta3 = 90.;
 251
 252     alpha = phi3*kDegrad;
 253
 254     x = xCenterS * TMath::Cos(alpha);
 255     y = xCenterS * TMath::Sin(alpha);
 256
 257     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 258
 259     gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
 260
 261     nRotMat++;
 262
 263   }
 264
 265   //-------------------------------------------------------------------
 266   //  Positioning of the L-sectors readout chambers
 267   //-------------------------------------------------------------------
 268
 269   for(ns=0;ns<nOuterSector;ns++){
 270     phi1 = ns * OuterOpenAngle + 270.*kDegrad + OuterAngleShift;
 271     phi1 *= kRaddeg; // in degrees
 272
 273     phi1 = (Float_t)TMath::Nint(phi1);
 274
 275
 276     if (phi1 > 360.) phi1 -= 360.;
 277
 278     theta1 = 90.;
 279     phi2   = 90.;
 280     theta2 = 180.;
 281     phi3   = ns * OuterOpenAngle+OuterAngleShift;
 282     phi3 *= kRaddeg; // in degrees
 283
 284     phi3 = (Float_t)TMath::Nint(phi3);
 285
 286
 287     if(phi3 > 360.) phi3 -= 360.;
 288
 289     theta3 = 90.;
 290
 291     alpha = phi3*kDegrad;
 292
 293     x = xCenterL * TMath::Cos(alpha);
 294     y = xCenterL * TMath::Sin(alpha);
 295
 296     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 297
 298
 299     gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
 300
 301     nRotMat++;
 302
 303   }
 304
 305   Float_t z0 = z_side - 0.95;
 306
 307   gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY");
 308
 309   // ==========================================================
 310   //                  wheels
 311   // ==========================================================
 312
 313   //
 314   //  auxilary structures
 315   //
 316
 317
 318   gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air"
 319
 320   // ----------------------------------------------------------
 321   //       Large wheel -> positioned in the TPC
 322   // ----------------------------------------------------------
 323
 324
 325   z0 = 263.5; // TPC length - 1/2 spoke wheel width
 326
 327   dm[0] = 258.;
 328   dm[1] = 278.;
 329   dm[2] = 11.5;
 330
 331   gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3);
 332
 333   dm[0] = dm[0]+2.;
 334   dm[1] = 278.;
 335   dm[2] = dm[2]-2.;
 336
 337   gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3);
 338
 339   gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY");
 340   gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY");
 341
 342   //
 343   //  Outer vessel + CO2 HV degrader
 344   //
 345
 346   dm[0] = 260.;
 347   dm[1] = 278.;
 348   dm[2] = 252.;
 349
 350   gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3);
 351
 352   dm[0] = 275.;
 353   dm[1] = 278.;
 354
 355   gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3);
 356
 357   gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY");
 358
 359
 360   // G10 plugs
 361
 362   dm[0] = 258.;
 363   dm[1] = 260.;
 364   dm[2] = 1.;
 365
 366   gMC->Gsvolu("TPG1","TUBE",idtmed[8],dm,3);
 367   gMC->Gspos("TPG1",1,"TPCO",0.,0.,251.,0,"ONLY");
 368   gMC->Gspos("TPG1",2,"TPCO",0.,0.,-251.,0,"ONLY");
 369
 370   gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY");
 371
 372
 373   //----------------------------------------------------------
 374   //  Small wheel -> positioned in "side gas
 375   //----------------------------------------------------------
 376
 377   dm[0] = 78.;
 378   dm[1] = 82.;
 379   dm[2] = 11.5;
 380
 381   gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3);
 382
 383   dm[0] = 78.;
 384   dm[1] = dm[1]-2;
 385   dm[2] = dm[2]-2.;
 386
 387   gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3);
 388
 389   gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY");
 390
 391   z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas"
 392
 393   gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY");
 394
 395
 396   // to avoid overlaps
 397
 398   dm[0] = 76.;
 399   dm[1] = 78.;
 400   dm[2] = 11.5;
 401
 402   gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3);
 403
 404   dm[2] = 9.5;
 405
 406   gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3);
 407
 408   gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY");
 409
 410   z0= 263.5;
 411
 412   gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY");
 413   gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY");
 414
 415   // G10 plug
 416
 417   dm[0] = 76.;
 418   dm[1] = 78.;
 419   dm[2] = 1.;
 420
 421   gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3);
 422
 423   z0 = 251.;
 424
 425   gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY");
 426   gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY");
 427
 428
 429   //---------------------------------------------------------
 430   //  central wheel  6 (radial direction) x 4 (along z) cm2
 431   //---------------------------------------------------------
 432
 433   dm[0] = 140.;
 434   dm[1] = 146.;
 435   dm[2] = 2.;
 436
 437   gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3);
 438
 439   dm[0] = dm[0] + 2.;
 440   dm[1] = dm[1] - 2.;
 441   dm[2] = dm[2] - 1.;
 442
 443   gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3);
 444
 445   z0 = z_side - 1.9 - 2.;
 446
 447   gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY");
 448
 449   //
 450
 451   gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke
 452
 453
 454   //---------------------------------------------------------
 455   //  inner spokes (nSectorInner)
 456   //---------------------------------------------------------
 457
 458   dm[0] = 0.5*(139.9-82.1);
 459   dm[1] = 3.;
 460   dm[2] = 2.;
 461
 462   Float_t x1 = dm[0]+82.;
 463
 464   gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3);
 465
 466   dm[1] = dm[1]-1.;
 467   dm[2] = dm[2]-1.;
 468
 469   gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3);
 470
 471   for(ns=0;ns<nInnerSector;ns++){
 472
 473     phi1 = 0.5*InnerOpenAngle + ns*InnerOpenAngle + InnerAngleShift;
 474     theta1=90.;
 475     phi1 *=kRaddeg;
 476
 477     phi1 = (Float_t)TMath::Nint(phi1);
 478
 479     phi2 = phi1+90.;
 480     if(phi2>360.) phi2 -= 360.;
 481     theta2=90.;
 482     phi3=0.;
 483     theta3=0.;
 484
 485     alpha = phi1 * kDegrad;
 486     x     = x1 * TMath::Cos(alpha);
 487     y     = x1 * TMath::Sin(alpha);
 488
 489    AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
 490
 491    gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
 492
 493    nRotMat++;
 494
 495   }
 496
 497   //-------------------------------------------------------------
 498   // outer spokes (nSectorOuter)
 499   //-------------------------------------------------------------
 500
 501   dm[0] = 0.5*(257.9-146.1);
 502   dm[1] = 3.;
 503   dm[2] = 2.;
 504
 505   x1 = dm[0] + 146.;
 506
 507   gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3);
 508
 509   dm[1] = dm[1] - 1.;
 510   dm[2] = dm[2] - 1.;
 511
 512   gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3);
 513
 514   for(ns=0;ns<nOuterSector;ns++){
 515
 516     phi1 = 0.5*OuterOpenAngle + ns*OuterOpenAngle + OuterAngleShift;
 517     theta1=90.;
 518     phi1 *=kRaddeg;
 519
 520     phi1 = (Float_t)TMath::Nint(phi1);
 521
 522     phi2 = phi1+90.;
 523     if(phi2>360.) phi2 -= 360.;
 524     theta2=90.;
 525     phi3=0.;
 526     theta3=0.;
 527
 528     alpha = phi1 * kDegrad;
 529     x     = x1 * TMath::Cos(alpha);
 530     y     = x1 * TMath::Sin(alpha);
 531
 532    AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
 533
 534    gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
 535
 536    nRotMat++;
 537
 538   }
 539
 540
 541
 542   // --------------------------------------------------------
 543   //         put the readout chambers into the TPC
 544   // --------------------------------------------------------
 545
 546   theta1 = 90.;
 547   phi1   = 0.;
 548   theta2 = 90.;
 549   phi2   = 270.;
 550   theta3 = 180.;
 551   phi3   = 0.;
 552
 553   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
 554
 555   z0 = z_side + 250.;
 556
 557   gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY");
 558   gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY");
 559
 560   gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
 561
 562   //----------------------------------------------------
 563   //  Inner vessel and HV degrader
 564   //----------------------------------------------------
 565
 566   dm[0] = 0.;
 567   dm[1] = 360.;
 568   dm[2] = 4.;
 569
 570   dm[3] = -250.;
 571   dm[4] = 74.4;
 572   dm[5] = 76.;
 573
 574   dm[6] = -64.5;
 575   dm[7] = 50.;
 576   dm[8] = 76.;
 577
 578   dm[9] = 64.5;
 579   dm[10] = 50.;
 580   dm[11] = 76.;
 581
 582   dm[12] = 250.;
 583   dm[13] = 74.4;
 584   dm[14] = 76.;
 585
 586   gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2
 587
 588   // cone parts
 589
 590   dm[0] = 0.;
 591   dm[1] = 360.;
 592   dm[2] = 2.;
 593
 594   dm[3] = 64.5;
 595   dm[4] = 50.;
 596   dm[5] = 51.6;
 597
 598   dm[6] = 250.;
 599   dm[7] = 74.4;
 600   dm[8] = 76.;
 601
 602
 603   gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre
 604
 605   gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY");
 606   gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY");
 607
 608   // barrel part
 609
 610   dm[0] = 50.;
 611   dm[1] = 50.5;
 612   dm[2] = 32.25;
 613
 614   gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3);
 615
 616   gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY");
 617
 618   gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY");
 619
 620
 621
 622
 623
 624   // ---------------------------------------------------
 625   //               volumes ordering
 626   // ---------------------------------------------------
 627   gMC->Gsord("TPSG", 6);
 628
 629 } // end of function
 630
 631
 632 //_____________________________________________________________________________
 633 void AliTPCv0::CreateMaterials()
 634 {
 635   //
 636   // Define materials for the TPC
 637   //
 638   AliTPC::CreateMaterials();
 639 }
 640
 641 //_____________________________________________________________________________
 642 void AliTPCv0::DrawDetector()
 643 {
 644   //
 645   // Draw a shaded view of the Time Projection Chamber version 0
 646   //
 647
 648   // Set everything unseen
 649   gMC->Gsatt("*", "seen", -1);
 650   //
 651   // Set ALIC mother transparent
 652   gMC->Gsatt("ALIC","SEEN",0);
 653   //
 654   // Set the volumes visible
 655   gMC->Gsatt("TPC","SEEN",0);
 656   gMC->Gsatt("TGAS","SEEN",0);
 657   gMC->Gsatt("TPSG","SEEN",0);
 658   gMC->Gsatt("TPHV","SEEN",1);
 659   gMC->Gsatt("TPMH","SEEN",1);
 660   gMC->Gsatt("TPEC","SEEN",0);
 661   gMC->Gsatt("TRCS","SEEN",1);
 662   gMC->Gsatt("TRCL","SEEN",1);
 663   gMC->Gsatt("TPWL","SEEN",1);
 664   gMC->Gsatt("TPWI","SEEN",1);
 665   gMC->Gsatt("TPWS","SEEN",1);
 666   gMC->Gsatt("TPW1","SEEN",1);
 667   gMC->Gsatt("TPS1","SEEN",1);
 668   gMC->Gsatt("TPS2","SEEN",1);
 669   gMC->Gsatt("TPG1","SEEN",1);
 670   gMC->Gsatt("TPG2","SEEN",1);
 671   gMC->Gsatt("TPWC","SEEN",1);
 672   gMC->Gsatt("TPSI","SEEN",1);
 673   gMC->Gsatt("TPSO","SEEN",1);
 674   gMC->Gsatt("TPCO","SEEN",1);
 675   gMC->Gsatt("TPOV","SEEN",1);
 676   gMC->Gsatt("TPVD","SEEN",1);
 677   //
 678   gMC->Gdopt("hide", "on");
 679   gMC->Gdopt("shad", "on");
 680   gMC->Gsatt("*", "fill", 7);
 681   gMC->SetClipBox(".");
 682   gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
 683   gMC->DefaultRange();
 684   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
 685   gMC->Gdhead(1111, "Time Projection Chamber");
 686   gMC->Gdman(18, 4, "MAN");
 687   gMC->Gdopt("hide","off");
 688 }
 689
 690 //_____________________________________________________________________________
 691 void AliTPCv0::Init()
 692 {
 693   //
 694   // Initialise Time Projection Chamber version 0
 695   //
 696   printf("TPC version 0 initialized\n");
 697 }
 698
 699 //_____________________________________________________________________________
 700 void AliTPCv0::StepManager()
 701 {
 702   //
 703   // Procedure called at each step in the TPC
 704   //
 705 }