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.,30); //30 sections
 100   //
 101   tpc->DefineSection(0,-289.6,77.,278.);
 102   tpc->DefineSection(1,-262.1,77.,278.);
 103   //
 104   tpc->DefineSection(2,-262.1,83.1,278.);
 105   tpc->DefineSection(3,-260.,83.1,278.);
 106   //
 107   tpc->DefineSection(4,-260.,70.,278.);
 108   tpc->DefineSection(5,-259.6,70.,278.);
 109   //
 110   tpc->DefineSection(6,-259.6,68.1,278.);
 111   tpc->DefineSection(7,-253.6,68.1,278.);
 112   //
 113   tpc->DefineSection(8,-253.6,68.,278.);
 114   tpc->DefineSection(9,-74.0,60.8,278.);
 115   //
 116   tpc->DefineSection(10,-74.0,60.1,278.);
 117   tpc->DefineSection(11,-73.3,60.1,278.);
 118   //
 119   tpc->DefineSection(12,-73.3,56.9,278.);
 120   tpc->DefineSection(13,-68.5,56.9,278.);
 121   //
 122   tpc->DefineSection(14,-68.5,60.,278.);
 123   tpc->DefineSection(15,-64.7,60.,278.);
 124   //
 125   tpc->DefineSection(16,-64.7,56.9,278.);
 126   tpc->DefineSection(17,73.3,56.9,278.);
 127   //
 128   tpc->DefineSection(18,73.3,60.1,278.);
 129   tpc->DefineSection(19,74.0,60.1,278.);
 130   tpc->DefineSection(20,74.0,60.8,278.);
 131   tpc->DefineSection(21,253.6,65.5,278.);
 132   //
 133   tpc->DefineSection(22,253.6,65.6,278.);
 134   tpc->DefineSection(23,259.6,65.6,278.);
 135   //
 136   tpc->DefineSection(24,259.6,70.0,278.);
 137   tpc->DefineSection(25,260.,70.0,278.);
 138   //
 139   tpc->DefineSection(26,260.,83.1,278.);
 140   tpc->DefineSection(27,262.1,83.1,278.);
 141   //
 142   tpc->DefineSection(28,262.1,77.,278);
 143   tpc->DefineSection(29,289.6,77.,278.);
 144   //
 145   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 146   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 147   //
 148   // drift volume - sensitive volume, extended beyond the
 149   // endcaps, because of the alignment
 150   //
 151   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 152   dvol->DefineSection(0,-260.,74.5,264.4);
 153   dvol->DefineSection(1,-253.6,74.5,264.4);
 154   //
 155   dvol->DefineSection(2,-253.6,76.6774,258.);
 156   dvol->DefineSection(3,253.6,76.6774,258.);
 157   //
 158   dvol->DefineSection(4,253.6,74.5,264.4);
 159   dvol->DefineSection(5,260.,74.5,264.4);
 160   //
 161   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-1");
 162   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 163   //
 164   v1->AddNode(v9,1);
 165   //
 166   // outer insulator
 167   //
 168   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 169   //
 170   tpco->DefineSection(0,-256.6,264.8,278.);
 171   tpco->DefineSection(1,-253.6,264.8,278.);
 172   //
 173   tpco->DefineSection(2,-253.6,258.,278.);
 174   tpco->DefineSection(3,250.6,258.,278.);
 175   //
 176   tpco->DefineSection(4,250.6,258.,275.5);
 177   tpco->DefineSection(5,253.6,258.,275.5);
 178   //
 179   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 180   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 181   //
 182   // outer containment vessel
 183   //
 184   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 185   //
 186   tocv->DefineSection(0,-256.6,264.8,278.);
 187   tocv->DefineSection(1,-253.6,264.8,278.);
 188   //
 189   tocv->DefineSection(2,-253.6,274.8124,278.);
 190   tocv->DefineSection(3,247.6,274.8124,278.);
 191   //
 192   tocv->DefineSection(4,247.6,270.4,278.);
 193   tocv->DefineSection(5,250.6,270.4,278.);
 194   //
 195   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 196   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 197   //
 198   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 199   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 200   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 201   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 202   //
 203   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 204   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 205   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 206   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 207   //
 208   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 209   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 210   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 211   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 212   //-------------------------------------------------------
 213   //  Tpc Outer Field Cage
 214   //  daughters - composite (sandwich)
 215   //-------------------------------------------------------
 216
 217   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 218   //
 219   tofc->DefineSection(0,-253.6,258.,269.6);
 220   tofc->DefineSection(1,-250.6,258.,269.6);
 221   //
 222   tofc->DefineSection(2,-250.6,258.,260.0676);
 223   tofc->DefineSection(3,250.6,258.,260.0676);
 224   //
 225   tofc->DefineSection(4,250.6,258.,275.5);
 226   tofc->DefineSection(5,253.6,258.,275.5);
 227   //
 228   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 229   //sandwich
 230   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 231   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 232   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 233   //
 234   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 235   //
 236   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 237   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 238   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 239   //
 240   // outer part - positioning
 241   //
 242   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 243   //
 244   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 245   //
 246   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 247   //
 248   v2->AddNode(v3,1); v2->AddNode(v4,1);
 249   //
 250   v1->AddNode(v2,1);
 251   //-----------------------------------------------------------
 252   //--------------------------------------------------------------------
 253   // Tpc Inner INsulator (CO2)
 254   // the cones, the central drum and the inner f.c. sandwich with a piece
 255   // of the flane will be placed in the TPC
 256   //--------------------------------------------------------------------
 257   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 258   //
 259   tpci->DefineSection(0,-253.6,68.4,76.6774);
 260   tpci->DefineSection(1,-74.0,61.2,76.6774);
 261   //
 262   tpci->DefineSection(2,74.0,61.2,76.6774);
 263   //
 264   tpci->DefineSection(3,253.6,65.9,76.6774);
 265   //
 266   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 267   //
 268   // now the inner field cage - only part of flanges (2 copies)
 269   //
 270   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 271   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 272   //
 273  //---------------------------------------------------------
 274   // Tpc Inner Containment vessel - Muon side
 275   //---------------------------------------------------------
 276   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 277   //
 278   tcms->DefineSection(0,-259.1,68.1,74.2);
 279   tcms->DefineSection(1,-253.6,68.1,74.2);
 280   //
 281   tcms->DefineSection(2,-253.6,68.1,68.4);
 282   tcms->DefineSection(3,-74.0,60.9,61.2);
 283   //
 284   tcms->DefineSection(4,-74.0,60.1,61.2);
 285   tcms->DefineSection(5,-73.3,60.1,61.2);
 286   //
 287   tcms->DefineSection(6,-73.3,56.9,61.2);
 288   tcms->DefineSection(7,-73.0,56.9,61.2);
 289   //
 290   tcms->DefineSection(8,-73.0,56.9,58.8);
 291   tcms->DefineSection(9,-71.3,56.9,58.8);
 292   //
 293   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 294   //-----------------------------------------------
 295   // inner containment vessel - shaft side
 296   //-----------------------------------------------
 297   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 298   //
 299   tcss->DefineSection(0,71.3,56.9,58.8);
 300   tcss->DefineSection(1,73.0,56.9,58.8);
 301   //
 302   tcss->DefineSection(2,73.0,56.9,61.2);
 303   tcss->DefineSection(3,73.3,56.9,61.2);
 304   //
 305   tcss->DefineSection(4,73.3,60.1,61.2);
 306   tcss->DefineSection(5,74.0,60.1,61.2);
 307   //
 308   tcss->DefineSection(6,74.0,60.9,61.2);
 309   tcss->DefineSection(7,253.6,65.6,65.9);
 310   //
 311   tcss->DefineSection(8,253.6,65.6,74.2);
 312   tcss->DefineSection(9,258.1,65.6,74.2);
 313   //
 314   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 315   //-----------------------------------------------
 316   //  Inner field cage
 317   //  define 4 parts and make an assembly
 318   //-----------------------------------------------
 319   // part1 - Al - 2 copies
 320   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 321   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 322   // sandwich - outermost parts - 2 copies
 323   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 324   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 325   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 326   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 327   //
 328   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 329   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 330   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 331   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 332   //
 333   // middle parts - 2 copies
 334   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 335   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 336   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 337   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 338   //
 339   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 340   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 341   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 342   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 343   // central part - 1 copy
 344   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 345   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 346   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 347   //
 348   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 349   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 350   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 351   //
 352   // inner part - positioning
 353   //
 354   // creating a sandwich
 355   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 356   //
 357   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 358   //
 359   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 360   //
 361   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 362   //
 363   tv100->AddNode(tv10,1);
 364   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 365   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 366   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 367   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 368   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 369   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 370   //
 371   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 372   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 373   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 374   v9->AddNode(tv100,1);
 375   //
 376   // central drum
 377   //
 378   // flange + sandwich
 379   //
 380   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 381   cfl->DefineSection(0,-71.1,59.7,61.2);
 382   cfl->DefineSection(1,-68.6,59.7,61.2);
 383   //
 384   cfl->DefineSection(2,-68.6,60.6324,61.2);
 385   cfl->DefineSection(3,68.6,60.6324,61.2);
 386   //
 387   cfl->DefineSection(4,68.6,59.7,61.2);
 388   cfl->DefineSection(5,71.1,59.7,61.2);
 389   //
 390   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 391   // sandwich
 392   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 393   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 394   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 395   //
 396   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 397   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 398   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 399   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 400   //
 401   // seals for central drum 2 copies
 402   //
 403   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 404   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 405   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 406   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 407   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 408   //
 409   // seal collars
 410   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 411   se->DefineSection(0,-72.8,59.7,61.2);
 412   se->DefineSection(1,-72.3,59.7,61.2);
 413   //
 414   se->DefineSection(2,-72.3,58.85,61.2);
 415   se->DefineSection(3,-71.6,58.85,61.2);
 416   //
 417   se->DefineSection(4,-71.6,59.7,61.2);
 418   se->DefineSection(5,-71.3,59.7,61.2);
 419   //
 420   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 421   //
 422   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 423   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 424   //
 425   // define reflection matrix
 426   //
 427   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 428   //
 429   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 430   //
 431   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 432   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 433   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 434   //
 435   // central membrane - 2 rings and a mylar membrane - assembly
 436   //
 437   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 438   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 439   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 440   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 441   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 442   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 443   //
 444   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 445   cm->AddNode(ihv,1);
 446   cm->AddNode(ohv,1);
 447   cm->AddNode(memv,1);
 448   v9->AddNode(cm,1);
 449   //
 450   // end caps - they are make as an assembly of single segments
 451   // containing both readout chambers
 452   //
 453   Double_t openingAngle = 10.*TMath::DegToRad();
 454   Double_t thick=1.5; // rib
 455   Double_t shift = thick/TMath::Sin(openingAngle);
 456   //
 457   Double_t lowEdge = 86.3; // hole in the wheel
 458   Double_t upEdge = 240.4; // hole in the wheel
 459   //
 460   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 461   //
 462   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 463   //
 464   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 465   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 466   //
 467   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 468   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 469   //
 470   Double_t ys = shift*TMath::Sin(openingAngle);
 471   Double_t xs = shift*TMath::Cos(openingAngle);
 472   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 473   tr->RegisterYourself();
 474   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 475   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 476   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 477   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 478   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 479   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 480   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 481   //
 482   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 483   //
 484   // readout chambers
 485   //
 486   // IROC first
 487   //
 488    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 489    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 490   // empty space
 491    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 492    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 493    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 494    //bars
 495    Double_t tga = (19.8328-12.3742)/39.3;
 496    Double_t xmin,xmax;
 497    xmin = 9.55*tga+12.3742;
 498    xmax = 9.95*tga+12.3742;
 499    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 500    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 501    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 502    xmin=19.4*tga+12.3742;
 503    xmax=19.9*tga+12.3742;
 504    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 505    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 506    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 507    xmin=29.35*tga+12.3742;
 508    xmax=29.75*tga+12.3742;
 509    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 510    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 511    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 512    //
 513    // holes for connectors
 514    //
 515    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 516    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 517    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 518    fileName += "/TPC/conn_iroc.dat";
 519    ifstream in;
 520    in.open(fileName.Data(), ios_base::in); // asci file
 521    for(Int_t i =0;i<86;i++){
 522       Double_t y = 3.99;
 523       Double_t x,z,ang;
 524       in>>x>>z>>ang;
 525       z-=26.5;
 526       TGeoRotation *rrr = new TGeoRotation();
 527       rrr->RotateY(ang);
 528       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 529       ibdv->AddNode(connv,i+1,trans);
 530    }
 531    in.close();
 532    // "cap"
 533    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 534    // "hole"
 535    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 536    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 537    tr1->RegisterYourself();
 538    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 539    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 540    //
 541    // pad plane and wire fixations
 542    //
 543    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 544    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 545    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 546    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 547    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 548    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 549    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 550    //
 551    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 552    //
 553    iroc->AddNode(ibdv,1);
 554    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 555    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 556    tga =(23.3521-14.5974)/49.65;
 557    Double_t xx = 24.825*tga+14.5974-0.6;
 558    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 559    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 560    //
 561    // OROC
 562    //
 563    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 564    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 565    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 566    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 567    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 568    //horizontal bars
 569    tga=(38.5084-20.2938)/99.3;
 570    xmin=tga*10.2+20.2938;
 571    xmax=tga*10.6+20.2938;
 572    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 573    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 574    //
 575    xmin=22.55*tga+20.2938;
 576    xmax=24.15*tga+20.2938;
 577    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 578    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 579    //
 580    xmin=36.1*tga+20.2938;
 581    xmax=36.5*tga+20.2938;
 582    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 583    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 584    //
 585    xmin=49.0*tga+20.2938;
 586    xmax=50.6*tga+20.2938;
 587    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 588    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 589    //
 590    xmin=63.6*tga+20.2938;
 591    xmax=64.0*tga+20.2938;
 592    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 593    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 594    //
 595    xmin=75.5*tga+20.2938;
 596    xmax=77.15*tga+20.2938;
 597    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 598    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 599    //
 600    xmin=88.7*tga+20.2938;
 601    xmax=89.1*tga+20.2938;
 602    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 603    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 604    //
 605    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 606    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 607    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 608    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 609    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 610    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 611    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 612    // vertical bars
 613    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 614    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 615    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 616    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 617    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 618    //
 619    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 620    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 621    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 622    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 623    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 624    //
 625    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 626    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 627    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 628    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 629    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 630    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 631    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 632    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 633    //
 634    // holes for connectors
 635    //
 636    fileName = gSystem->Getenv("ALICE_ROOT");
 637    fileName += "/TPC/conn_oroc.dat";
 638    in.open(fileName.Data(), ios_base::in); // asci file
 639    for(Int_t i =0;i<78;i++){
 640       Double_t y =3.89;
 641       Double_t x,z,ang;
 642       Double_t x1,z1,x2,z2;
 643       in>>x>>z>>ang;
 644       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 645       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 646       //
 647       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 648       //
 649       TGeoRotation *rr = new TGeoRotation();
 650       rr->RotateY(ang);
 651       z1-=54.95;
 652       z2-=54.95;
 653       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 654       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 655       obdv->AddNode(connv,i+1,trans1);
 656       obdv->AddNode(connv,i+79,trans2);
 657    }
 658    in.close();
 659    // cap
 660    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 661    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 662    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 663    tr5->RegisterYourself();
 664    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 665    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 666    //
 667    // pad plane and wire fixations
 668    //
 669    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 670    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 671    //
 672    tga=(43.5239-23.3874)/114.2;
 673    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 674    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 675    xx = 57.1*tga+23.3874-0.7;
 676    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 677    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 678    //
 679    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 680    //
 681    oroc->AddNode(obdv,1);
 682    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 683    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 684    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 685    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 686    //
 687    // now iroc and oroc are placed into a sector...
 688    //
 689    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 690    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 691    //
 692
 693    TGeoRotation rot1("rot1",90.,90.,0.);
 694    TGeoRotation rot2("rot2");
 695    rot2.RotateY(10.);
 696    TGeoRotation *rot = new TGeoRotation("rot");
 697    *rot=rot1*rot2;
 698    //
 699    Double_t x0,y0;
 700    x0=110.2*TMath::Cos(openingAngle);
 701    y0=110.2*TMath::Sin(openingAngle);
 702    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 703    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 704    x0=188.45*TMath::Cos(openingAngle);
 705    y0=188.45*TMath::Sin(openingAngle);
 706    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 707    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 708    //
 709    // A-side
 710    //
 711    secta->AddNode(ch,1);
 712    secta->AddNode(iroc,1,combi1a);
 713    secta->AddNode(oroc,1,combi2a);
 714    //
 715    // C-side
 716    //
 717    sectc->AddNode(ch,1);
 718    sectc->AddNode(iroc,1,combi1c);
 719    sectc->AddNode(oroc,1,combi2c);
 720    //
 721    // now I try to make  wheels...
 722    //
 723    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 724    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 725    //
 726    for(Int_t i =0;i<18;i++){
 727      Double_t phi = (20.*i);
 728      TGeoRotation *r = new TGeoRotation();
 729      r->RotateZ(phi);
 730      wheela->AddNode(secta,i+1,r);
 731      wheelc->AddNode(sectc,i+1,r);
 732    }
 733    // wheels in the drift volume!
 734    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 735    v9->AddNode(wheela,1,combi3);
 736    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 737    //_____________________________________________________________
 738    // service support wheel
 739    //_____________________________________________________________
 740   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 741   sw->DefineSection(0,-4.,80.5,251.75);
 742   sw->DefineSection(1,4.,80.5,251.75);
 743   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 744   //
 745   thick=1.;
 746   shift = thick/TMath::Sin(openingAngle);
 747   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 748   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 749   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 750   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 751   //
 752   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 753   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 754   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 755   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 756   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 757   //
 758   shv->AddNode(elv,1);
 759   //
 760   //
 761   ys = shift*TMath::Sin(openingAngle);
 762   xs = shift*TMath::Cos(openingAngle);
 763   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 764   // cover
 765   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 766   co->DefineSection(0,-0.5,77.,255.25);
 767   co->DefineSection(1,0.5,77.,255.25);
 768   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 769   // hole in a cover
 770   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 771   shift=4./TMath::Sin(openingAngle);
 772   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 773   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 774   //
 775   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 776   //
 777   ys = shift*TMath::Sin(openingAngle);
 778   xs = shift*TMath::Cos(openingAngle);
 779   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 780   //
 781   // Sector as an Assembly
 782   //
 783   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 784   swhs->AddNode(swv,1);
 785   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 786   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 787   //
 788   // SSW as an Assembly of sectors
 789   //
 790  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 791    for(Int_t i =0;i<18;i++){
 792      Double_t phi = (20.*i);
 793      TGeoRotation *r = new TGeoRotation();
 794      r->RotateZ(phi);
 795      swheel->AddNode(swhs,i+1,r);
 796    }
 797    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 798    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 799    //
 800   //----------------------------------------------------------
 801   // TPc Support Rods - MAKROLON
 802   //----------------------------------------------------------
 803   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 804   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 805   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 806   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 807   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 808   // upper and lower rods differ in length!
 809   Double_t *upar;
 810   upar=NULL;
 811   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 812   upar=new Double_t [3];
 813   upar[0]=1.8;
 814   upar[1]=2.2;
 815
 816   //
 817   //HV rods - makrolon + 0.58cm (diameter) Cu
 818   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 819   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 820   //
 821   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 822   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 823   hvrv->AddNode(hvcv,1);
 824   //
 825   // resistor rods
 826   //
 827   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 828   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 829   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 830   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 831   //
 832   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 833   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 834   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 835   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 836   //
 837   // ceramic rod with water
 838   //
 839   criv->AddNode(cwiv,1);
 840   crov->AddNode(cwov,1);
 841   //
 842   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 843   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 844   //
 845   // peek rod
 846   //
 847   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 848   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 849   //
 850   // resistor rods assembly
 851   //
 852    TGeoRotation *rotr = new TGeoRotation("rotr");
 853    rotr->RotateZ(-21.);
 854   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 855   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 856   //
 857   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 858   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 859   //
 860   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 861   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 862   rrin->AddNode(rriv,1);
 863   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 864   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 865   rrin->AddNode(priv,1);
 866   //
 867   rrou->AddNode(rrov,1);
 868   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 869   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 870   rrou->AddNode(prov,1);
 871   for(Int_t i=0;i<18;i++){
 872     Double_t angle,x,y;
 873     Double_t z,r;
 874     angle=TMath::DegToRad()*20.*(Double_t)i;
 875     r=81.5;
 876     x=r * TMath::Cos(angle);
 877     y=r * TMath::Sin(angle);
 878     upar[2]=126.64; //lower
 879     z= 126.96;
 880     if(i==3){
 881       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 882       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 883     }
 884     else {
 885       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 886       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 887     }
 888
 889
 890     //
 891     r=254.25;
 892     x=r * TMath::Cos(angle);
 893     y=r * TMath::Sin(angle);
 894     upar[2]=126.54; //upper
 895     z=127.06;
 896     //
 897     if(i==15){
 898       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 899       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 900       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 901     }
 902     else if(i==11){
 903       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 904       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 905     }
 906     else{
 907     //
 908       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 909       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 910     }
 911
 912   }
 913
 914   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 915   alice->AddNode(v1,1);
 916
 917
 918 } // end of function
 919
 920
 921 //_____________________________________________________________________________
 922 void AliTPCv0::CreateMaterials()
 923 {
 924   //
 925   // Define materials for the TPC
 926   //
 927   AliTPC::CreateMaterials();
 928 }
 929
 930
 931 //_____________________________________________________________________________
 932 void AliTPCv0::Init()
 933 {
 934   //
 935   // Initialise Time Projection Chamber version 0
 936   //
 937
 938   printf("%s: *** TPC version 0 initialized***\n",ClassName());
 939
 940   //  printf("TPC version 0 initialized\n");
 941 }
 942
 943 //_____________________________________________________________________________
 944 void AliTPCv0::StepManager()
 945 {
 946   //
 947   // Procedure called at each step in the TPC
 948   //
 949 }