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 /* $Id$ */
  17 //
  18
  19 ///////////////////////////////////////////////////////////////////////////////
  20 //                                                                           //
  21 //  Time Projection Chamber version 0 -- "coarse" TPC                        //
  22 //                                                                           //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv0Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 #include <Riostream.h>
  33
  34 #include <TMath.h>
  35 #include <TVirtualMC.h>
  36 #include <TString.h>
  37 #include <TSystem.h>
  38
  39 #include "AliConst.h"
  40 #include "AliRun.h"
  41 #include "AliTPCDigitsArray.h"
  42 #include "AliTPCParamSR.h"
  43 #include "AliTPCv0.h"
  44 #include "TGeoManager.h"
  45 #include "TGeoVolume.h"
  46 #include "TGeoPcon.h"
  47 #include "TGeoTube.h"
  48 #include "TGeoPgon.h"
  49 #include "TGeoTrd1.h"
  50 #include "TGeoCompositeShape.h"
  51 #include "TGeoPara.h"
  52 ClassImp(AliTPCv0)
  53
  54 //_____________________________________________________________________________
  55 AliTPCv0::AliTPCv0(const char *name, const char *title)
  56          :AliTPC(name, title)
  57 {
  58   //
  59   // Standard creator for TPC version 0
  60   //
  61
  62
  63   if (fTPCParam)
  64      fTPCParam->Write(fTPCParam->GetTitle());
  65 }
  66
  67 //_____________________________________________________________________________
  68 void AliTPCv0::CreateGeometry()
  69 {
  70
  71   //
  72   // Creation of the TPC version 0, i.e. no sensitive volumes,
  73   // only the material distribution
  74   //
  75   //Begin_Html
  76   /*
  77     <img src="picts/AliTPC.gif">
  78   */
  79   //End_Html
  80   //Begin_Html
  81   /*
  82     <img src="picts/AliTPCv0Tree.gif">
  83   */
  84   //End_Html
  85
  86  //----------------------------------------------------------
  87   // This geometry is written using TGeo class
  88   // Firstly the shapes are defined, and only then the volumes
  89   // What is recognized by the MC are volumes
  90   //----------------------------------------------------------
  91   //
  92   //  tpc - this will be the mother volume
  93   //
  94
  95   //
  96   // here I define a volume TPC
  97   // retrive the medium name with "TPC_" as a leading string
  98   //
  99   TGeoPcon *tpc = new TGeoPcon(0.,360.,28); //28 sections
 100   //
 101   tpc->DefineSection(0,-291.,77.,278.);
 102   tpc->DefineSection(1,-270,77.,278.);
 103   //
 104   tpc->DefineSection(2,-270.,77.,278.);
 105   tpc->DefineSection(3,-262.1,77.,278.);
 106   //
 107   tpc->DefineSection(4,-262.1,83.1,278.);
 108   tpc->DefineSection(5,-260.,83.1,278.);
 109   //
 110   tpc->DefineSection(6,-260.,70.,278.);
 111   tpc->DefineSection(7,-259.6,70.,278.);
 112   //
 113   tpc->DefineSection(8,-259.6,68.1,278.);
 114   tpc->DefineSection(9,-253.6,68.1,278.);
 115   //
 116   tpc->DefineSection(10,-253.6,68.,278.);
 117   tpc->DefineSection(11,-74.0,60.8,278.);
 118   //
 119   tpc->DefineSection(12,-74.0,60.1,278.);
 120   tpc->DefineSection(13,-73.3,60.1,278.);
 121   //
 122   tpc->DefineSection(14,-73.3,56.9,278.);
 123   tpc->DefineSection(15,-68.5,56.9,278.);
 124   //
 125   tpc->DefineSection(16,-68.5,60.,278.);
 126   tpc->DefineSection(17,-65.,60.,278.);
 127   //
 128   tpc->DefineSection(18,-65.,56.9,278.);
 129   tpc->DefineSection(19,73.3,56.9,278.);
 130   //
 131   tpc->DefineSection(20,73.3,60.1,278.);
 132   tpc->DefineSection(21,74.0,60.1,278.);
 133   //
 134   tpc->DefineSection(22,74.0,60.8,278.);
 135   tpc->DefineSection(23,253.6,65.5,278.);
 136   //
 137   tpc->DefineSection(24,253.6,65.6,278.);
 138   tpc->DefineSection(25,259.6,65.6,278.);
 139   //
 140   tpc->DefineSection(26,259.6,70.0,278.);
 141   tpc->DefineSection(27,291.,77.,278.);
 142   //
 143   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 144   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 145   //
 146   // drift volume - sensitive volume, extended beyond the
 147   // endcaps, because of the alignment
 148   //
 149   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 150   dvol->DefineSection(0,-260.,74.5,264.4);
 151   dvol->DefineSection(1,-253.6,74.5,264.4);
 152   //
 153   dvol->DefineSection(2,-253.6,76.6774,258.);
 154   dvol->DefineSection(3,253.6,76.6774,258.);
 155   //
 156   dvol->DefineSection(4,253.6,74.5,264.4);
 157   dvol->DefineSection(5,260.,74.5,264.4);
 158   //
 159   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-1");
 160   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 161   //
 162   v1->AddNode(v9,1);
 163   //
 164   // outer insulator
 165   //
 166   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 167   //
 168   tpco->DefineSection(0,-256.6,264.8,278.);
 169   tpco->DefineSection(1,-253.6,264.8,278.);
 170   //
 171   tpco->DefineSection(2,-253.6,258.,278.);
 172   tpco->DefineSection(3,250.6,258.,278.);
 173   //
 174   tpco->DefineSection(4,250.6,258.,275.5);
 175   tpco->DefineSection(5,253.6,258.,275.5);
 176   //
 177   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 178   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 179   //
 180   // outer containment vessel
 181   //
 182   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 183   //
 184   tocv->DefineSection(0,-256.6,264.8,278.);
 185   tocv->DefineSection(1,-253.6,264.8,278.);
 186   //
 187   tocv->DefineSection(2,-253.6,274.8124,278.);
 188   tocv->DefineSection(3,247.6,274.8124,278.);
 189   //
 190   tocv->DefineSection(4,247.6,270.4,278.);
 191   tocv->DefineSection(5,250.6,270.4,278.);
 192   //
 193   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 194   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 195   //
 196   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 197   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 198   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 199   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 200   //
 201   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 202   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 203   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 204   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 205   //
 206   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 207   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 208   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 209   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 210   //-------------------------------------------------------
 211   //  Tpc Outer Field Cage
 212   //  daughters - composite (sandwich)
 213   //-------------------------------------------------------
 214
 215   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 216   //
 217   tofc->DefineSection(0,-253.6,258.,269.6);
 218   tofc->DefineSection(1,-250.6,258.,269.6);
 219   //
 220   tofc->DefineSection(2,-250.6,258.,260.0676);
 221   tofc->DefineSection(3,250.6,258.,260.0676);
 222   //
 223   tofc->DefineSection(4,250.6,258.,275.5);
 224   tofc->DefineSection(5,253.6,258.,275.5);
 225   //
 226   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 227   //sandwich
 228   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 229   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 230   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 231   //
 232   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 233   //
 234   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 235   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 236   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 237   //
 238   // outer part - positioning
 239   //
 240   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 241   //
 242   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 243   //
 244   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 245   //
 246   v2->AddNode(v3,1); v2->AddNode(v4,1);
 247   //
 248   v1->AddNode(v2,1);
 249   //-----------------------------------------------------------
 250   //--------------------------------------------------------------------
 251   // Tpc Inner INsulator (CO2)
 252   // the cones, the central drum and the inner f.c. sandwich with a piece
 253   // of the flane will be placed in the TPC
 254   //--------------------------------------------------------------------
 255   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 256   //
 257   tpci->DefineSection(0,-253.6,68.4,76.6774);
 258   tpci->DefineSection(1,-74.0,61.2,76.6774);
 259   //
 260   tpci->DefineSection(2,74.0,61.2,76.6774);
 261   //
 262   tpci->DefineSection(3,253.6,65.9,76.6774);
 263   //
 264   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 265   //
 266   // now the inner field cage - only part of flanges (2 copies)
 267   //
 268   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 269   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 270   //
 271  //---------------------------------------------------------
 272   // Tpc Inner Containment vessel - Muon side
 273   //---------------------------------------------------------
 274   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 275   //
 276   tcms->DefineSection(0,-259.1,68.1,74.2);
 277   tcms->DefineSection(1,-253.6,68.1,74.2);
 278   //
 279   tcms->DefineSection(2,-253.6,68.1,68.4);
 280   tcms->DefineSection(3,-74.0,60.9,61.2);
 281   //
 282   tcms->DefineSection(4,-74.0,60.1,61.2);
 283   tcms->DefineSection(5,-73.3,60.1,61.2);
 284   //
 285   tcms->DefineSection(6,-73.3,56.9,61.2);
 286   tcms->DefineSection(7,-73.0,56.9,61.2);
 287   //
 288   tcms->DefineSection(8,-73.0,56.9,58.8);
 289   tcms->DefineSection(9,-71.3,56.9,58.8);
 290   //
 291   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 292   //-----------------------------------------------
 293   // inner containment vessel - shaft side
 294   //-----------------------------------------------
 295   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 296   //
 297   tcss->DefineSection(0,71.3,56.9,58.8);
 298   tcss->DefineSection(1,73.0,56.9,58.8);
 299   //
 300   tcss->DefineSection(2,73.0,56.9,61.2);
 301   tcss->DefineSection(3,73.3,56.9,61.2);
 302   //
 303   tcss->DefineSection(4,73.3,60.1,61.2);
 304   tcss->DefineSection(5,74.0,60.1,61.2);
 305   //
 306   tcss->DefineSection(6,74.0,60.9,61.2);
 307   tcss->DefineSection(7,253.6,65.6,65.9);
 308   //
 309   tcss->DefineSection(8,253.6,65.6,74.2);
 310   tcss->DefineSection(9,258.1,65.6,74.2);
 311   //
 312   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 313   //-----------------------------------------------
 314   //  Inner field cage
 315   //  define 4 parts and make an assembly
 316   //-----------------------------------------------
 317   // part1 - Al - 2 copies
 318   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 319   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 320   // sandwich - outermost parts - 2 copies
 321   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 322   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 323   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 324   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 325   //
 326   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 327   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 328   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 329   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 330   //
 331   // middle parts - 2 copies
 332   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 333   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 334   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 335   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 336   //
 337   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 338   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 339   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 340   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 341   // central part - 1 copy
 342   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 343   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 344   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 345   //
 346   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 347   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 348   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 349   //
 350   // inner part - positioning
 351   //
 352   // creating a sandwich
 353   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 354   //
 355   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 356   //
 357   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 358   //
 359   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 360   //
 361   tv100->AddNode(tv10,1);
 362   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 363   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 364   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 365   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 366   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 367   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 368   //
 369   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 370   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 371   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 372   v9->AddNode(tv100,1);
 373   //
 374   // central drum
 375   //
 376   // flange + sandwich
 377   //
 378   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 379   cfl->DefineSection(0,-71.1,59.7,61.2);
 380   cfl->DefineSection(1,-68.6,59.7,61.2);
 381   //
 382   cfl->DefineSection(2,-68.6,60.6324,61.2);
 383   cfl->DefineSection(3,68.6,60.6324,61.2);
 384   //
 385   cfl->DefineSection(4,68.6,59.7,61.2);
 386   cfl->DefineSection(5,71.1,59.7,61.2);
 387   //
 388   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 389   // sandwich
 390   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 391   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 392   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 393   //
 394   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 395   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 396   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 397   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 398   //
 399   // seals for central drum 2 copies
 400   //
 401   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 402   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 403   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 404   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 405   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 406   //
 407   // seal collars
 408   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 409   se->DefineSection(0,-72.8,59.7,61.2);
 410   se->DefineSection(1,-72.3,59.7,61.2);
 411   //
 412   se->DefineSection(2,-72.3,58.85,61.2);
 413   se->DefineSection(3,-71.6,58.85,61.2);
 414   //
 415   se->DefineSection(4,-71.6,59.7,61.2);
 416   se->DefineSection(5,-71.3,59.7,61.2);
 417   //
 418   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 419   //
 420   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 421   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 422   //
 423   // define reflection matrix
 424   //
 425   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 426   //
 427   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 428   //
 429   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 430   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 431   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 432   //
 433   // central membrane - 2 rings and a mylar membrane - assembly
 434   //
 435   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 436   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 437   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 438   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 439   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 440   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 441   //
 442   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 443   cm->AddNode(ihv,1);
 444   cm->AddNode(ohv,1);
 445   cm->AddNode(memv,1);
 446   v9->AddNode(cm,1);
 447   //
 448   // end caps - they are make as an assembly of single segments
 449   // containing both readout chambers
 450   //
 451   Double_t openingAngle = 10.*TMath::DegToRad();
 452   Double_t thick=1.5; // rib
 453   Double_t shift = thick/TMath::Sin(openingAngle);
 454   //
 455   Double_t lowEdge = 86.3; // hole in the wheel
 456   Double_t upEdge = 240.4; // hole in the wheel
 457   //
 458   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 459   //
 460   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 461   //
 462   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 463   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 464   //
 465   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 466   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 467   //
 468   Double_t ys = shift*TMath::Sin(openingAngle);
 469   Double_t xs = shift*TMath::Cos(openingAngle);
 470   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 471   tr->RegisterYourself();
 472   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 473   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 474   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 475   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 476   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 477   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 478   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 479   //
 480   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 481   //
 482   // readout chambers
 483   //
 484   // IROC first
 485   //
 486    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 487    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 488   // empty space
 489    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 490    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 491    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 492    //bars
 493    Double_t tga = (19.8328-12.3742)/39.3;
 494    Double_t xmin,xmax;
 495    xmin = 9.55*tga+12.3742;
 496    xmax = 9.95*tga+12.3742;
 497    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 498    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 499    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 500    xmin=19.4*tga+12.3742;
 501    xmax=19.9*tga+12.3742;
 502    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 503    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 504    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 505    xmin=29.35*tga+12.3742;
 506    xmax=29.75*tga+12.3742;
 507    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 508    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 509    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 510    //
 511    // holes for connectors
 512    //
 513    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 514    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 515    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 516    fileName += "/TPC/conn_iroc.dat";
 517    ifstream in;
 518    in.open(fileName.Data(), ios_base::in); // asci file
 519    for(Int_t i =0;i<86;i++){
 520       Double_t y = 3.99;
 521       Double_t x,z,ang;
 522       in>>x>>z>>ang;
 523       z-=26.5;
 524       TGeoRotation *rrr = new TGeoRotation();
 525       rrr->RotateY(ang);
 526       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 527       ibdv->AddNode(connv,i+1,trans);
 528    }
 529    in.close();
 530    // "cap"
 531    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 532    // "hole"
 533    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 534    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 535    tr1->RegisterYourself();
 536    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 537    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 538    //
 539    // pad plane and wire fixations
 540    //
 541    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 542    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 543    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 544    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 545    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 546    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 547    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 548    //
 549    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 550    //
 551    iroc->AddNode(ibdv,1);
 552    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 553    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 554    tga =(23.3521-14.5974)/49.65;
 555    Double_t xx = 24.825*tga+14.5974-0.6;
 556    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 557    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 558    //
 559    // OROC
 560    //
 561    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 562    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 563    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 564    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 565    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 566    //horizontal bars
 567    tga=(38.5084-20.2938)/99.3;
 568    xmin=tga*10.2+20.2938;
 569    xmax=tga*10.6+20.2938;
 570    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 571    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 572    //
 573    xmin=22.55*tga+20.2938;
 574    xmax=24.15*tga+20.2938;
 575    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 576    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 577    //
 578    xmin=36.1*tga+20.2938;
 579    xmax=36.5*tga+20.2938;
 580    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 581    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 582    //
 583    xmin=49.0*tga+20.2938;
 584    xmax=50.6*tga+20.2938;
 585    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 586    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 587    //
 588    xmin=63.6*tga+20.2938;
 589    xmax=64.0*tga+20.2938;
 590    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 591    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 592    //
 593    xmin=75.5*tga+20.2938;
 594    xmax=77.15*tga+20.2938;
 595    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 596    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 597    //
 598    xmin=88.7*tga+20.2938;
 599    xmax=89.1*tga+20.2938;
 600    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 601    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 602    //
 603    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 604    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 605    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 606    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 607    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 608    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 609    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 610    // vertical bars
 611    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 612    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 613    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 614    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 615    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 616    //
 617    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 618    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 619    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 620    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 621    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 622    //
 623    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 624    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 625    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 626    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 627    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 628    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 629    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 630    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 631    //
 632    // holes for connectors
 633    //
 634    fileName = gSystem->Getenv("ALICE_ROOT");
 635    fileName += "/TPC/conn_oroc.dat";
 636    in.open(fileName.Data(), ios_base::in); // asci file
 637    for(Int_t i =0;i<78;i++){
 638       Double_t y =3.89;
 639       Double_t x,z,ang;
 640       Double_t x1,z1,x2,z2;
 641       in>>x>>z>>ang;
 642       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 643       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 644       //
 645       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 646       //
 647       TGeoRotation *rr = new TGeoRotation();
 648       rr->RotateY(ang);
 649       z1-=54.95;
 650       z2-=54.95;
 651       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 652       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 653       obdv->AddNode(connv,i+1,trans1);
 654       obdv->AddNode(connv,i+79,trans2);
 655    }
 656    in.close();
 657    // cap
 658    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 659    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 660    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 661    tr5->RegisterYourself();
 662    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 663    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 664    //
 665    // pad plane and wire fixations
 666    //
 667    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 668    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 669    //
 670    tga=(43.5239-23.3874)/114.2;
 671    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 672    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 673    xx = 57.1*tga+23.3874-0.7;
 674    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 675    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 676    //
 677    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 678    //
 679    oroc->AddNode(obdv,1);
 680    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 681    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 682    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 683    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 684    //
 685    // now iroc and oroc are placed into a sector...
 686    //
 687    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 688    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 689    //
 690
 691    TGeoRotation rot1("rot1",90.,90.,0.);
 692    TGeoRotation rot2("rot2");
 693    rot2.RotateY(10.);
 694    TGeoRotation *rot = new TGeoRotation("rot");
 695    *rot=rot1*rot2;
 696    //
 697    Double_t x0,y0;
 698    x0=110.2*TMath::Cos(openingAngle);
 699    y0=110.2*TMath::Sin(openingAngle);
 700    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 701    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 702    x0=188.45*TMath::Cos(openingAngle);
 703    y0=188.45*TMath::Sin(openingAngle);
 704    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 705    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 706    //
 707    // A-side
 708    //
 709    secta->AddNode(ch,1);
 710    secta->AddNode(iroc,1,combi1a);
 711    secta->AddNode(oroc,1,combi2a);
 712    //
 713    // C-side
 714    //
 715    sectc->AddNode(ch,1);
 716    sectc->AddNode(iroc,1,combi1c);
 717    sectc->AddNode(oroc,1,combi2c);
 718    //
 719    // now I try to make  wheels...
 720    //
 721    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 722    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 723    //
 724    for(Int_t i =0;i<18;i++){
 725      Double_t phi = (20.*i);
 726      TGeoRotation *r = new TGeoRotation();
 727      r->RotateZ(phi);
 728      wheela->AddNode(secta,i+1,r);
 729      wheelc->AddNode(sectc,i+1,r);
 730    }
 731    // wheels in the drift volume!
 732    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 733    v9->AddNode(wheela,1,combi3);
 734    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 735    //_____________________________________________________________
 736    // service support wheel
 737    //_____________________________________________________________
 738   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 739   sw->DefineSection(0,-4.,80.5,251.75);
 740   sw->DefineSection(1,4.,80.5,251.75);
 741   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 742   //
 743   thick=1.;
 744   shift = thick/TMath::Sin(openingAngle);
 745   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 746   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 747   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 748   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 749   //
 750   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 751   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 752   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 753   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 754   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 755   //
 756   shv->AddNode(elv,1);
 757   //
 758   //
 759   ys = shift*TMath::Sin(openingAngle);
 760   xs = shift*TMath::Cos(openingAngle);
 761   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 762   // cover
 763   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 764   co->DefineSection(0,-0.5,77.,255.25);
 765   co->DefineSection(1,0.5,77.,255.25);
 766   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 767   // hole in a cover
 768   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 769   shift=4./TMath::Sin(openingAngle);
 770   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 771   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 772   //
 773   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 774   //
 775   ys = shift*TMath::Sin(openingAngle);
 776   xs = shift*TMath::Cos(openingAngle);
 777   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 778   //
 779   // Sector as an Assembly
 780   //
 781   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 782   swhs->AddNode(swv,1);
 783   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 784   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 785   //
 786   // SSW as an Assembly of sectors
 787   //
 788  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 789    for(Int_t i =0;i<18;i++){
 790      Double_t phi = (20.*i);
 791      TGeoRotation *r = new TGeoRotation();
 792      r->RotateZ(phi);
 793      swheel->AddNode(swhs,i+1,r);
 794    }
 795    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 796    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 797    //
 798   //----------------------------------------------------------
 799   // TPc Support Rods - MAKROLON
 800   //----------------------------------------------------------
 801   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 802   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 803   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 804   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 805   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 806   // upper and lower rods differ in length!
 807   Double_t *upar;
 808   upar=NULL;
 809   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 810   upar=new Double_t [3];
 811   upar[0]=1.8;
 812   upar[1]=2.2;
 813
 814   //
 815   //HV rods - makrolon + 0.58cm (diameter) Cu
 816   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 817   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 818   //
 819   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 820   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 821   hvrv->AddNode(hvcv,1);
 822   //
 823   // resistor rods
 824   //
 825   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 826   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 827   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 828   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 829   //
 830   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 831   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 832   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 833   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 834   //
 835   // ceramic rod with water
 836   //
 837   criv->AddNode(cwiv,1);
 838   crov->AddNode(cwov,1);
 839   //
 840   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 841   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 842   //
 843   // peek rod
 844   //
 845   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 846   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 847   //
 848   // resistor rods assembly
 849   //
 850    TGeoRotation *rotr = new TGeoRotation("rotr");
 851    rotr->RotateZ(-21.);
 852   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 853   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 854   //
 855   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 856   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 857   //
 858   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 859   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 860   rrin->AddNode(rriv,1);
 861   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 862   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 863   rrin->AddNode(priv,1);
 864   //
 865   rrou->AddNode(rrov,1);
 866   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 867   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 868   rrou->AddNode(prov,1);
 869   for(Int_t i=0;i<18;i++){
 870     Double_t angle,x,y;
 871     Double_t z,r;
 872     angle=TMath::DegToRad()*20.*(Double_t)i;
 873     r=81.5;
 874     x=r * TMath::Cos(angle);
 875     y=r * TMath::Sin(angle);
 876     upar[2]=126.64; //lower
 877     z= 126.96;
 878     if(i==3){
 879       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 880       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 881     }
 882     else {
 883       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 884       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 885     }
 886
 887
 888     //
 889     r=254.25;
 890     x=r * TMath::Cos(angle);
 891     y=r * TMath::Sin(angle);
 892     upar[2]=126.54; //upper
 893     z=127.06;
 894     //
 895     if(i==15){
 896       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 897       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 898       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 899     }
 900     else if(i==11){
 901       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 902       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 903     }
 904     else{
 905     //
 906       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 907       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 908     }
 909
 910   }
 911
 912   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 913   alice->AddNode(v1,1);
 914
 915
 916 } // end of function
 917
 918
 919 //_____________________________________________________________________________
 920 void AliTPCv0::CreateMaterials()
 921 {
 922   //
 923   // Define materials for the TPC
 924   //
 925   AliTPC::CreateMaterials();
 926 }
 927
 928
 929 //_____________________________________________________________________________
 930 void AliTPCv0::Init()
 931 {
 932   //
 933   // Initialise Time Projection Chamber version 0
 934   //
 935
 936   printf("%s: *** TPC version 0 initialized***\n",ClassName());
 937
 938   //  printf("TPC version 0 initialized\n");
 939 }
 940
 941 //_____________________________________________________________________________
 942 void AliTPCv0::StepManager()
 943 {
 944   //
 945   // Procedure called at each step in the TPC
 946   //
 947 }