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 "TGeoCone.h"
  48 #include "TGeoTube.h"
  49 #include "TGeoPgon.h"
  50 #include "TGeoTrd1.h"
  51 #include "TGeoCompositeShape.h"
  52 #include "TGeoPara.h"
  53
  54 using std::ifstream;
  55 using std::ios_base;
  56 ClassImp(AliTPCv0)
  57
  58 //_____________________________________________________________________________
  59 AliTPCv0::AliTPCv0(const char *name, const char *title)
  60          :AliTPC(name, title)
  61 {
  62   //
  63   // Standard creator for TPC version 0
  64   //
  65
  66
  67   if (fTPCParam)
  68      fTPCParam->Write(fTPCParam->GetTitle());
  69 }
  70
  71 //_____________________________________________________________________________
  72
  73 void AliTPCv0::CreateGeometry()
  74 {
  75
  76   //
  77   // Creation of the TPC version 0, i.e. no sensitive volumes,
  78   // only the material distribution
  79   //
  80   //Begin_Html
  81   /*
  82     <img src="picts/AliTPC.gif">
  83   */
  84   //End_Html
  85   //Begin_Html
  86   /*
  87     <img src="picts/AliTPCv0Tree.gif">
  88   */
  89   //End_Html
  90
  91  //----------------------------------------------------------
  92   // This geometry is written using TGeo class
  93   // Firstly the shapes are defined, and only then the volumes
  94   // What is recognized by the MC are volumes
  95   //----------------------------------------------------------
  96   //
  97   //  tpc - this will be the mother volume
  98   //
  99
 100   //
 101   // here I define a volume TPC
 102   // retrive the medium name with "TPC_" as a leading string
 103   //
 104   TGeoPcon *tpc = new TGeoPcon(0.,360.,30); //30 sections
 105   //
 106   tpc->DefineSection(0,-289.6,77.,278.);
 107   tpc->DefineSection(1,-262.1,77.,278.);
 108   //
 109   tpc->DefineSection(2,-262.1,83.1,278.);
 110   tpc->DefineSection(3,-260.,83.1,278.);
 111   //
 112   tpc->DefineSection(4,-260.,70.,278.);
 113   tpc->DefineSection(5,-259.6,70.,278.);
 114   //
 115   tpc->DefineSection(6,-259.6,68.1,278.);
 116   tpc->DefineSection(7,-253.6,68.1,278.);
 117   //
 118   tpc->DefineSection(8,-253.6,67.88,278.);//hs
 119   tpc->DefineSection(9,-74.0,60.68,278.);// hs
 120   //
 121   tpc->DefineSection(10,-74.0,60.1,278.);
 122   tpc->DefineSection(11,-73.3,60.1,278.);
 123   //
 124   tpc->DefineSection(12,-73.3,56.9,278.);
 125   tpc->DefineSection(13,-68.5,56.9,278.);
 126   //
 127   tpc->DefineSection(14,-68.5,60.,278.);
 128   tpc->DefineSection(15,-64.7,60.,278.);
 129   //
 130   tpc->DefineSection(16,-64.7,56.9,278.);
 131   tpc->DefineSection(17,73.3,56.9,278.);
 132   //
 133   tpc->DefineSection(18,73.3,60.1,278.);
 134   tpc->DefineSection(19,74.0,60.1,278.);
 135   //
 136   tpc->DefineSection(20,74.0,60.68,278.);// hs
 137   tpc->DefineSection(21,253.6,65.38,278.);// hs
 138   //
 139   tpc->DefineSection(22,253.6,65.6,278.);
 140   tpc->DefineSection(23,259.6,65.6,278.);
 141   //
 142   tpc->DefineSection(24,259.6,70.0,278.);
 143   tpc->DefineSection(25,260.,70.0,278.);
 144   //
 145   tpc->DefineSection(26,260.,83.1,278.);
 146   tpc->DefineSection(27,262.1,83.1,278.);
 147   //
 148   tpc->DefineSection(28,262.1,77.,278);
 149   tpc->DefineSection(29,289.6,77.,278.);
 150   //
 151   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 152   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 153   //
 154   // drift volume - sensitive volume, extended beyond the
 155   // endcaps, because of the alignment
 156   //
 157   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 158   dvol->DefineSection(0,-260.,74.5,264.4);
 159   dvol->DefineSection(1,-253.6,74.5,264.4);
 160   //
 161   dvol->DefineSection(2,-253.6,76.6774,258.);
 162   dvol->DefineSection(3,253.6,76.6774,258.);
 163   //
 164   dvol->DefineSection(4,253.6,74.5,264.4);
 165   dvol->DefineSection(5,260.,74.5,264.4);
 166   //
 167   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_DriftGasS1");
 168   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 169   //
 170   v1->AddNode(v9,1);
 171   //
 172   // outer insulator
 173   //
 174   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 175   //
 176   tpco->DefineSection(0,-256.6,264.8,278.);
 177   tpco->DefineSection(1,-253.6,264.8,278.);
 178   //
 179   tpco->DefineSection(2,-253.6,258.,278.);
 180   tpco->DefineSection(3,250.6,258.,278.);
 181   //
 182   tpco->DefineSection(4,250.6,258.,275.5);
 183   tpco->DefineSection(5,253.6,258.,275.5);
 184   //
 185   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 186   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 187   //
 188   // outer containment vessel
 189   //
 190   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 191   //
 192   tocv->DefineSection(0,-256.6,264.8,278.);
 193   tocv->DefineSection(1,-253.6,264.8,278.);
 194   //
 195   tocv->DefineSection(2,-253.6,274.8124,278.);
 196   tocv->DefineSection(3,247.6,274.8124,278.);
 197   //
 198   tocv->DefineSection(4,247.6,270.4,278.);
 199   tocv->DefineSection(5,250.6,270.4,278.);
 200   //
 201   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 202   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 203   //
 204   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 205   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 206   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 207   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 208   //
 209   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 210   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 211   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 212   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 213   //
 214   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 215   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 216   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 217   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 218   TGeoMedium *mhs = gGeoManager->GetMedium("TPC_Steel");
 219   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 220   //-------------------------------------------------------
 221   //  Tpc Outer Field Cage
 222   //  daughters - composite (sandwich)
 223   //-------------------------------------------------------
 224
 225   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 226   //
 227   tofc->DefineSection(0,-253.6,258.,269.6);
 228   tofc->DefineSection(1,-250.6,258.,269.6);
 229   //
 230   tofc->DefineSection(2,-250.6,258.,260.0676);
 231   tofc->DefineSection(3,250.6,258.,260.0676);
 232   //
 233   tofc->DefineSection(4,250.6,258.,275.5);
 234   tofc->DefineSection(5,253.6,258.,275.5);
 235   //
 236   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 237   //sandwich
 238   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 239   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 240   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 241   //
 242   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 243   //
 244   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 245   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 246   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 247   //
 248   // outer part - positioning
 249   //
 250   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 251   //
 252   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 253   //
 254   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 255   //
 256   v2->AddNode(v3,1); v2->AddNode(v4,1);
 257   //
 258   v1->AddNode(v2,1);
 259   //-----------------------------------------------------------
 260   //--------------------------------------------------------------------
 261   // Tpc Inner INsulator (CO2)
 262   // the cones, the central drum and the inner f.c. sandwich with a piece
 263   // of the flane will be placed in the TPC
 264   //--------------------------------------------------------------------
 265   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 266   //
 267   tpci->DefineSection(0,-253.6,68.4,76.6774);
 268   tpci->DefineSection(1,-74.0,61.2,76.6774);
 269   //
 270   tpci->DefineSection(2,74.0,61.2,76.6774);
 271   //
 272   tpci->DefineSection(3,253.6,65.9,76.6774);
 273   //
 274   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 275   //
 276   // now the inner field cage - only part of flanges (2 copies)
 277   //
 278   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 279   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 280   //
 281  //---------------------------------------------------------
 282   // Tpc Inner Containment vessel - Muon side
 283   //---------------------------------------------------------
 284   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 285   //
 286   tcms->DefineSection(0,-259.1,68.1,74.2);
 287   tcms->DefineSection(1,-253.6,68.1,74.2);
 288   //
 289   tcms->DefineSection(2,-253.6,68.1,68.4);
 290   tcms->DefineSection(3,-74.0,60.9,61.2);
 291   //
 292   tcms->DefineSection(4,-74.0,60.1,61.2);
 293   tcms->DefineSection(5,-73.3,60.1,61.2);
 294   //
 295   tcms->DefineSection(6,-73.3,56.9,61.2);
 296   tcms->DefineSection(7,-73.0,56.9,61.2);
 297   //
 298   tcms->DefineSection(8,-73.0,56.9,58.8);
 299   tcms->DefineSection(9,-71.3,56.9,58.8);
 300   //
 301   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 302   //------------------------------------------------
 303   //  Heat screen muon side
 304   //------------------------------------------------
 305
 306   TGeoCone *thsm = new TGeoCone(89.8,67.88,68.1,60.68,60.9);
 307   TGeoCone *thsmw = new TGeoCone(89.8,67.94,68.04,60.74,60.84);
 308   TGeoVolume *hvsm = new TGeoVolume("TPC_HSM",thsm,mhs); //steel
 309   TGeoVolume *hvsmw = new TGeoVolume("TPC_HSMW",thsmw,m12); //water
 310   // assembly heat screen muon
 311   hvsm->AddNode(hvsmw,1);
 312   //-----------------------------------------------
 313   // inner containment vessel - shaft side
 314   //-----------------------------------------------
 315   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 316   //
 317   tcss->DefineSection(0,71.3,56.9,58.8);
 318   tcss->DefineSection(1,73.0,56.9,58.8);
 319   //
 320   tcss->DefineSection(2,73.0,56.9,61.2);
 321   tcss->DefineSection(3,73.3,56.9,61.2);
 322   //
 323   tcss->DefineSection(4,73.3,60.1,61.2);
 324   tcss->DefineSection(5,74.0,60.1,61.2);
 325   //
 326   tcss->DefineSection(6,74.0,60.9,61.2);
 327   tcss->DefineSection(7,253.6,65.6,65.9);
 328   //
 329   tcss->DefineSection(8,253.6,65.6,74.2);
 330   tcss->DefineSection(9,258.1,65.6,74.2);
 331   //
 332   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 333   //-------------------------------------------------
 334   //  Heat screen shaft side
 335   //--------------------------------------------------
 336   TGeoCone *thss = new TGeoCone(89.8,60.68,60.9,65.38,65.6);
 337   TGeoCone *thssw = new TGeoCone(89.8,60.74,60.84,65.44,65.54);
 338   TGeoVolume *hvss = new TGeoVolume("TPC_HSS",thss,mhs); //steel
 339   TGeoVolume *hvssw = new TGeoVolume("TPC_HSSW",thssw,m12); //water
 340   //assembly heat screen shaft
 341   hvss->AddNode(hvssw,1);
 342   //-----------------------------------------------
 343   //  Inner field cage
 344   //  define 4 parts and make an assembly
 345   //-----------------------------------------------
 346   // part1 - Al - 2 copies
 347   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 348   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 349   // sandwich - outermost parts - 2 copies
 350   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 351   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 352   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 353   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 354   //
 355   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 356   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 357   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 358   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 359   //
 360   // middle parts - 2 copies
 361   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 362   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 363   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 364   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 365   //
 366   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 367   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 368   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 369   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 370   // central part - 1 copy
 371   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 372   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 373   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 374   //
 375   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 376   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 377   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 378   //
 379   // inner part - positioning
 380   //
 381   // creating a sandwich
 382   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 383   //
 384   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 385   //
 386   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 387   //
 388   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 389   //
 390   tv100->AddNode(tv10,1);
 391   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 392   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 393   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 394   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 395   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 396   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 397   //
 398   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 399   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 400   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 401   v1->AddNode(hvsm,1,new TGeoTranslation(0.,0.,-163.8));
 402   v1->AddNode(hvss,1,new TGeoTranslation(0.,0.,163.8));
 403   v9->AddNode(tv100,1);
 404   //
 405   // central drum
 406   //
 407   // flange + sandwich
 408   //
 409   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 410   cfl->DefineSection(0,-71.1,59.7,61.2);
 411   cfl->DefineSection(1,-68.6,59.7,61.2);
 412   //
 413   cfl->DefineSection(2,-68.6,60.6324,61.2);
 414   cfl->DefineSection(3,68.6,60.6324,61.2);
 415   //
 416   cfl->DefineSection(4,68.6,59.7,61.2);
 417   cfl->DefineSection(5,71.1,59.7,61.2);
 418   //
 419   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 420   // sandwich
 421   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 422   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 423   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 424   //
 425   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 426   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 427   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 428   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 429   //
 430   // seals for central drum 2 copies
 431   //
 432   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 433   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 434   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 435   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 436   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 437   //
 438   // seal collars
 439   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 440   se->DefineSection(0,-72.8,59.7,61.2);
 441   se->DefineSection(1,-72.3,59.7,61.2);
 442   //
 443   se->DefineSection(2,-72.3,58.85,61.2);
 444   se->DefineSection(3,-71.6,58.85,61.2);
 445   //
 446   se->DefineSection(4,-71.6,59.7,61.2);
 447   se->DefineSection(5,-71.3,59.7,61.2);
 448   //
 449   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 450   //
 451   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 452   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 453   //
 454   // define reflection matrix
 455   //
 456   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 457   //
 458   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 459   //
 460   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 461   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 462   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 463   //
 464   // central membrane - 2 rings and a mylar membrane - assembly
 465   //
 466   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 467   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 468   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 469   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 470   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 471   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 472   //
 473   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 474   cm->AddNode(ihv,1);
 475   cm->AddNode(ohv,1);
 476   cm->AddNode(memv,1);
 477   v9->AddNode(cm,1);
 478   //
 479   // end caps - they are make as an assembly of single segments
 480   // containing both readout chambers
 481   //
 482   Double_t openingAngle = 10.*TMath::DegToRad();
 483   Double_t thick=1.5; // rib
 484   Double_t shift = thick/TMath::Sin(openingAngle);
 485   //
 486   Double_t lowEdge = 86.3; // hole in the wheel
 487   Double_t upEdge = 240.4; // hole in the wheel
 488   //
 489   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 490   //
 491   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 492   //
 493   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 494   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 495   //
 496   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 497   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 498   //
 499   Double_t ys = shift*TMath::Sin(openingAngle);
 500   Double_t xs = shift*TMath::Cos(openingAngle);
 501   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 502   tr->RegisterYourself();
 503   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 504   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 505   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 506   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 507   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 508   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 509   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 510   //
 511   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 512   //
 513   // readout chambers
 514   //
 515   // IROC first
 516   //
 517    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 518    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 519   // empty space
 520    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 521    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 522    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 523    //bars
 524    Double_t tga = (19.8328-12.3742)/39.3;
 525    Double_t xmin,xmax;
 526    xmin = 9.55*tga+12.3742;
 527    xmax = 9.95*tga+12.3742;
 528    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 529    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 530    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 531    xmin=19.4*tga+12.3742;
 532    xmax=19.9*tga+12.3742;
 533    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 534    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 535    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 536    xmin=29.35*tga+12.3742;
 537    xmax=29.75*tga+12.3742;
 538    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 539    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 540    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 541    //
 542    // holes for connectors
 543    //
 544    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 545    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 546    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 547    fileName += "/TPC/conn_iroc.dat";
 548    ifstream in;
 549    in.open(fileName.Data(), ios_base::in); // asci file
 550    for(Int_t i =0;i<86;i++){
 551       Double_t y = 3.99;
 552       Double_t x,z,ang;
 553       in>>x>>z>>ang;
 554       z-=26.5;
 555       TGeoRotation *rrr = new TGeoRotation();
 556       rrr->RotateY(ang);
 557       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 558       ibdv->AddNode(connv,i+1,trans);
 559    }
 560    in.close();
 561    // "cap"
 562    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 563    // "hole"
 564    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 565    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 566    tr1->RegisterYourself();
 567    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 568    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 569    //
 570    // pad plane and wire fixations
 571    //
 572    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 573    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 574    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 575    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 576    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 577    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 578    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 579    //
 580    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 581    //
 582    iroc->AddNode(ibdv,1);
 583    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 584    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 585    tga =(23.3521-14.5974)/49.65;
 586    Double_t xx = 24.825*tga+14.5974-0.6;
 587    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 588    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 589    //
 590    // OROC
 591    //
 592    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 593    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 594    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 595    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 596    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 597    //horizontal bars
 598    tga=(38.5084-20.2938)/99.3;
 599    xmin=tga*10.2+20.2938;
 600    xmax=tga*10.6+20.2938;
 601    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 602    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 603    //
 604    xmin=22.55*tga+20.2938;
 605    xmax=24.15*tga+20.2938;
 606    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 607    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 608    //
 609    xmin=36.1*tga+20.2938;
 610    xmax=36.5*tga+20.2938;
 611    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 612    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 613    //
 614    xmin=49.0*tga+20.2938;
 615    xmax=50.6*tga+20.2938;
 616    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 617    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 618    //
 619    xmin=63.6*tga+20.2938;
 620    xmax=64.0*tga+20.2938;
 621    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 622    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 623    //
 624    xmin=75.5*tga+20.2938;
 625    xmax=77.15*tga+20.2938;
 626    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 627    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 628    //
 629    xmin=88.7*tga+20.2938;
 630    xmax=89.1*tga+20.2938;
 631    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 632    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 633    //
 634    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 635    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 636    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 637    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 638    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 639    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 640    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 641    // vertical bars
 642    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 643    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 644    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 645    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 646    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 647    //
 648    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 649    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 650    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 651    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 652    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 653    //
 654    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 655    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 656    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 657    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 658    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 659    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 660    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 661    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 662    //
 663    // holes for connectors
 664    //
 665    fileName = gSystem->Getenv("ALICE_ROOT");
 666    fileName += "/TPC/conn_oroc.dat";
 667    in.open(fileName.Data(), ios_base::in); // asci file
 668    for(Int_t i =0;i<78;i++){
 669       Double_t y =3.89;
 670       Double_t x,z,ang;
 671       Double_t x1,z1,x2,z2;
 672       in>>x>>z>>ang;
 673       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 674       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 675       //
 676       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 677       //
 678       TGeoRotation *rr = new TGeoRotation();
 679       rr->RotateY(ang);
 680       z1-=54.95;
 681       z2-=54.95;
 682       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 683       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 684       obdv->AddNode(connv,i+1,trans1);
 685       obdv->AddNode(connv,i+79,trans2);
 686    }
 687    in.close();
 688    // cap
 689    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 690    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 691    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 692    tr5->RegisterYourself();
 693    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 694    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 695    //
 696    // pad plane and wire fixations
 697    //
 698    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 699    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 700    //
 701    tga=(43.5239-23.3874)/114.2;
 702    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 703    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 704    xx = 57.1*tga+23.3874-0.7;
 705    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 706    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 707    //
 708    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 709    //
 710    oroc->AddNode(obdv,1);
 711    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 712    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 713    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 714    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 715    //
 716    // now iroc and oroc are placed into a sector...
 717    //
 718    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 719    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 720    //
 721
 722    TGeoRotation rot1("rot1",90.,90.,0.);
 723    TGeoRotation rot2("rot2");
 724    rot2.RotateY(10.);
 725    TGeoRotation *rot = new TGeoRotation("rot");
 726    *rot=rot1*rot2;
 727    //
 728    Double_t x0,y0;
 729    x0=110.2*TMath::Cos(openingAngle);
 730    y0=110.2*TMath::Sin(openingAngle);
 731    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 732    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 733    x0=188.45*TMath::Cos(openingAngle);
 734    y0=188.45*TMath::Sin(openingAngle);
 735    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 736    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 737    //
 738    // A-side
 739    //
 740    secta->AddNode(ch,1);
 741    secta->AddNode(iroc,1,combi1a);
 742    secta->AddNode(oroc,1,combi2a);
 743    //
 744    // C-side
 745    //
 746    sectc->AddNode(ch,1);
 747    sectc->AddNode(iroc,1,combi1c);
 748    sectc->AddNode(oroc,1,combi2c);
 749    //
 750    // now I try to make  wheels...
 751    //
 752    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 753    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 754    //
 755    for(Int_t i =0;i<18;i++){
 756      Double_t phi = (20.*i);
 757      TGeoRotation *r = new TGeoRotation();
 758      r->RotateZ(phi);
 759      wheela->AddNode(secta,i+1,r);
 760      wheelc->AddNode(sectc,i+1,r);
 761    }
 762    // wheels in the drift volume!
 763    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 764    v9->AddNode(wheela,1,combi3);
 765    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 766    //_____________________________________________________________
 767    // service support wheel
 768    //_____________________________________________________________
 769   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 770   sw->DefineSection(0,-4.,80.5,251.75);
 771   sw->DefineSection(1,4.,80.5,251.75);
 772   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 773   //
 774   thick=1.;
 775   shift = thick/TMath::Sin(openingAngle);
 776   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 777   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 778   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 779   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 780   //
 781   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 782   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 783   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 784   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 785   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 786   //
 787   shv->AddNode(elv,1);
 788   //
 789   //
 790   ys = shift*TMath::Sin(openingAngle);
 791   xs = shift*TMath::Cos(openingAngle);
 792   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 793   // cover
 794   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 795   co->DefineSection(0,-0.5,77.,255.25);
 796   co->DefineSection(1,0.5,77.,255.25);
 797   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 798   // hole in a cover
 799   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 800   shift=4./TMath::Sin(openingAngle);
 801   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 802   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 803   //
 804   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 805   //
 806   ys = shift*TMath::Sin(openingAngle);
 807   xs = shift*TMath::Cos(openingAngle);
 808   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 809   //
 810   // Sector as an Assembly
 811   //
 812   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 813   swhs->AddNode(swv,1);
 814   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 815   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 816   //
 817   // SSW as an Assembly of sectors
 818   //
 819  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 820    for(Int_t i =0;i<18;i++){
 821      Double_t phi = (20.*i);
 822      TGeoRotation *r = new TGeoRotation();
 823      r->RotateZ(phi);
 824      swheel->AddNode(swhs,i+1,r);
 825    }
 826    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 827    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 828    //
 829   //----------------------------------------------------------
 830   // TPc Support Rods - MAKROLON
 831   //----------------------------------------------------------
 832   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 833   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 834   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 835   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 836   // upper and lower rods differ in length!
 837   Double_t *upar;
 838   upar=NULL;
 839   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 840   upar=new Double_t [3];
 841   upar[0]=1.8;
 842   upar[1]=2.2;
 843
 844   //
 845   //HV rods - makrolon + 0.58cm (diameter) Cu
 846   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 847   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 848   //
 849   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 850   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 851   hvrv->AddNode(hvcv,1);
 852   //
 853   // resistor rods
 854   //
 855   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 856   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 857   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 858   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 859   //
 860   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 861   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 862   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 863   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 864   //
 865   // ceramic rod with water
 866   //
 867   criv->AddNode(cwiv,1);
 868   crov->AddNode(cwov,1);
 869   //
 870   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 871   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 872   //
 873   // peek rod
 874   //
 875   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 876   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 877   //
 878   // resistor rods assembly
 879   //
 880    TGeoRotation *rotr = new TGeoRotation("rotr");
 881    rotr->RotateZ(-21.);
 882   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 883   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 884   //
 885   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 886   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 887   //
 888   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 889   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 890   rrin->AddNode(rriv,1);
 891   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 892   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 893   rrin->AddNode(priv,1);
 894   //
 895   rrou->AddNode(rrov,1);
 896   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 897   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 898   rrou->AddNode(prov,1);
 899   for(Int_t i=0;i<18;i++){
 900     Double_t angle,x,y;
 901     Double_t z,r;
 902     angle=TMath::DegToRad()*20.*(Double_t)i;
 903     r=81.5;
 904     x=r * TMath::Cos(angle);
 905     y=r * TMath::Sin(angle);
 906     upar[2]=126.64; //lower
 907     z= 126.96;
 908     if(i==3){
 909       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 910       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 911     }
 912     else {
 913       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 914       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 915     }
 916
 917
 918     //
 919     r=254.25;
 920     x=r * TMath::Cos(angle);
 921     y=r * TMath::Sin(angle);
 922     upar[2]=126.54; //upper
 923     z=127.06;
 924     //
 925     if(i==15){
 926       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 927       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 928       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 929     }
 930     else if(i==11){
 931       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 932       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 933     }
 934     else{
 935     //
 936       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 937       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 938     }
 939
 940   }
 941
 942   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 943   alice->AddNode(v1,1);
 944
 945
 946 } // end of function
 947
 948
 949
 950 //_____________________________________________________________________________
 951 void AliTPCv0::CreateMaterials()
 952 {
 953   //
 954   // Define materials for the TPC
 955   //
 956   AliTPC::CreateMaterials();
 957 }
 958
 959
 960 //_____________________________________________________________________________
 961 void AliTPCv0::Init()
 962 {
 963   //
 964   // Initialise Time Projection Chamber version 0
 965   //
 966
 967   printf("%s: *** TPC version 0 initialized***\n",ClassName());
 968
 969   //  printf("TPC version 0 initialized\n");
 970 }
 971
 972 //_____________________________________________________________________________
 973 void AliTPCv0::StepManager()
 974 {
 975   //
 976   // Procedure called at each step in the TPC
 977   //
 978 }