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