TPC/AliTPCv0.cxx

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