TPC/AliTPCv1.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 1 -- detailed TPC and fast simulation    //
  22 //                                                                           //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv1Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 #include <Riostream.h>
  33 #include <stdlib.h>
  34 #include <TInterpreter.h>
  35 #include <TMath.h>
  36 #include <TVirtualMC.h>
  37 #include <TString.h>
  38 #include <TSystem.h>
  39
  40 #include "AliConst.h"
  41 #include "AliRun.h"
  42 #include "AliTPCDigitsArray.h"
  43 #include "AliTPCParam.h"
  44 #include "AliTPCParamSR.h"
  45 #include "AliTPCv1.h"
  46 #include "TLorentzVector.h"
  47 #include "TGeoCone.h"
  48 #include "AliMC.h"
  49 #include "TGeoManager.h"
  50 #include "TGeoVolume.h"
  51 #include "TGeoPcon.h"
  52 #include "TGeoTube.h"
  53 #include "TGeoPgon.h"
  54 #include "TGeoTrd1.h"
  55 #include "TGeoCompositeShape.h"
  56 #include "TGeoPara.h"
  57 ClassImp(AliTPCv1)
  58
  59 //_____________________________________________________________________________
  60
  61   AliTPCv1::AliTPCv1():AliTPC(),fIdSens(0)
  62 {
  63
  64   fHitType = 1;
  65
  66 }
  67
  68 //_____________________________________________________________________________
  69 AliTPCv1::AliTPCv1(const char *name, const char *title)
  70   :AliTPC(name, title),fIdSens(0)
  71  {
  72   //
  73   // Standard constructor for Time Projection Chamber
  74   //
  75
  76
  77   if (fTPCParam)
  78      fTPCParam->Write(fTPCParam->GetTitle());
  79
  80   fHitType=1;
  81 }
  82
  83 //_____________________________________________________________________________
  84 void AliTPCv1::CreateGeometry()
  85 {
  86   //-------------------------------------------------------------
  87   // Creates geometry for Time Projection Chamber version 1
  88   // Detailed geometry -- Fast simulation - space points
  89   // at the pad-rows centers
  90   // Origin M.Kowalski, INP Cracow, Marek.Kowalski@ifj.edu.pl
  91   //-----------------------------------------------------------
  92
  93   //Begin_Html
  94   /*
  95     <img src="picts/AliTPC.gif">
  96   */
  97   //End_Html
  98   //Begin_Html
  99   /*
 100     <img src="picts/AliTPCv1Tree.gif">
 101   */
 102   //End_Html
 103   //----------------------------------------------------------
 104   // This geometry is written using TGeo class
 105   // Firstly the shapes are defined, and only then the volumes
 106   // What is recognized by the MC are volumes
 107   //----------------------------------------------------------
 108   //
 109   //  tpc - this will be the mother volume
 110   //
 111
 112   //
 113   // here I define a volume TPC
 114   // retrive the medium name with "TPC_" as a leading string
 115   //
 116   TGeoPcon *tpc = new TGeoPcon(0.,360.,30); //30 sections
 117   //
 118   tpc->DefineSection(0,-289.6,77.,278.);
 119   tpc->DefineSection(1,-262.1,77.,278.);
 120   //
 121   tpc->DefineSection(2,-262.1,83.1,278.);
 122   tpc->DefineSection(3,-260.,83.1,278.);
 123   //
 124   tpc->DefineSection(4,-260.,70.,278.);
 125   tpc->DefineSection(5,-259.6,70.,278.);
 126   //
 127   tpc->DefineSection(6,-259.6,68.1,278.);
 128   tpc->DefineSection(7,-253.6,68.1,278.);
 129   //
 130   tpc->DefineSection(8,-253.6,67.88,278.);//hs
 131   tpc->DefineSection(9,-74.0,60.68,278.);// hs
 132   //
 133   tpc->DefineSection(10,-74.0,60.1,278.);
 134   tpc->DefineSection(11,-73.3,60.1,278.);
 135   //
 136   tpc->DefineSection(12,-73.3,56.9,278.);
 137   tpc->DefineSection(13,-68.5,56.9,278.);
 138   //
 139   tpc->DefineSection(14,-68.5,60.,278.);
 140   tpc->DefineSection(15,-64.7,60.,278.);
 141   //
 142   tpc->DefineSection(16,-64.7,56.9,278.);
 143   tpc->DefineSection(17,73.3,56.9,278.);
 144   //
 145   tpc->DefineSection(18,73.3,60.1,278.);
 146   tpc->DefineSection(19,74.0,60.1,278.);
 147   //
 148   tpc->DefineSection(20,74.0,60.68,278.);// hs
 149   tpc->DefineSection(21,253.6,65.38,278.);// hs
 150   //
 151   tpc->DefineSection(22,253.6,65.6,278.);
 152   tpc->DefineSection(23,259.6,65.6,278.);
 153   //
 154   tpc->DefineSection(24,259.6,70.0,278.);
 155   tpc->DefineSection(25,260.,70.0,278.);
 156   //
 157   tpc->DefineSection(26,260.,83.1,278.);
 158   tpc->DefineSection(27,262.1,83.1,278.);
 159   //
 160   tpc->DefineSection(28,262.1,77.,278);
 161   tpc->DefineSection(29,289.6,77.,278.);
 162
 163
 164   //
 165   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 166   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 167   //
 168   // drift volume - sensitive volume, extended beyond the
 169   // endcaps, because of the alignment
 170   //
 171   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 172   dvol->DefineSection(0,-260.,74.5,264.4);
 173   dvol->DefineSection(1,-253.6,74.5,264.4);
 174   //
 175   dvol->DefineSection(2,-253.6,76.6774,258.);
 176   dvol->DefineSection(3,253.6,76.6774,258.);
 177   //
 178   dvol->DefineSection(4,253.6,74.5,264.4);
 179   dvol->DefineSection(5,260.,74.5,264.4);
 180   //
 181   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-1");
 182   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 183   //
 184   //
 185   v1->AddNode(v9,1);
 186   //
 187   // outer insulator
 188   //
 189   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 190   //
 191   tpco->DefineSection(0,-256.6,264.8,278.);
 192   tpco->DefineSection(1,-253.6,264.8,278.);
 193   //
 194   tpco->DefineSection(2,-253.6,258.,278.);
 195   tpco->DefineSection(3,250.6,258.,278.);
 196   //
 197   tpco->DefineSection(4,250.6,258.,275.5);
 198   tpco->DefineSection(5,253.6,258.,275.5);
 199   //
 200   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 201   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 202   //
 203   // outer containment vessel
 204   //
 205   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 206   //
 207   tocv->DefineSection(0,-256.6,264.8,278.);
 208   tocv->DefineSection(1,-253.6,264.8,278.);
 209   //
 210   tocv->DefineSection(2,-253.6,274.8124,278.);
 211   tocv->DefineSection(3,247.6,274.8124,278.);
 212   //
 213   tocv->DefineSection(4,247.6,270.4,278.);
 214   tocv->DefineSection(5,250.6,270.4,278.);
 215   //
 216   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 217   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 218   //
 219   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 220   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 221   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 222   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 223   //
 224   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 225   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 226   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 227   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 228   //
 229   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 230   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 231   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 232   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 233   TGeoMedium *mhs = gGeoManager->GetMedium("TPC_Steel");
 234   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 235   //-------------------------------------------------------
 236   //  Tpc Outer Field Cage
 237   //  daughters - composite (sandwich)
 238   //-------------------------------------------------------
 239
 240   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 241   //
 242   tofc->DefineSection(0,-253.6,258.,269.6);
 243   tofc->DefineSection(1,-250.6,258.,269.6);
 244   //
 245   tofc->DefineSection(2,-250.6,258.,260.0676);
 246   tofc->DefineSection(3,250.6,258.,260.0676);
 247   //
 248   tofc->DefineSection(4,250.6,258.,275.5);
 249   tofc->DefineSection(5,253.6,258.,275.5);
 250   //
 251   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 252   //sandwich
 253   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 254   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 255   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 256   //
 257   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 258   //
 259   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 260   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 261   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 262   //
 263   // outer part - positioning
 264   //
 265   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 266   //
 267   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 268   //
 269   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 270   //
 271   v2->AddNode(v3,1); v2->AddNode(v4,1);
 272   //
 273   v1->AddNode(v2,1);
 274   //--------------------------------------------------------------------
 275   // Tpc Inner INsulator (CO2)
 276   // the cones, the central drum and the inner f.c. sandwich with a piece
 277   // of the flane will be placed in the TPC
 278   //--------------------------------------------------------------------
 279   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 280   //
 281   tpci->DefineSection(0,-253.6,68.4,76.6774);
 282   tpci->DefineSection(1,-74.0,61.2,76.6774);
 283   //
 284   tpci->DefineSection(2,74.0,61.2,76.6774);
 285   //
 286   tpci->DefineSection(3,253.6,65.9,76.6774);
 287   //
 288   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 289   //
 290   // now the inner field cage - only part of flanges (2 copies)
 291   //
 292   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 293   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 294   //
 295  //---------------------------------------------------------
 296   // Tpc Inner Containment vessel - Muon side
 297   //---------------------------------------------------------
 298   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 299   //
 300   tcms->DefineSection(0,-259.1,68.1,74.2);
 301   tcms->DefineSection(1,-253.6,68.1,74.2);
 302   //
 303   tcms->DefineSection(2,-253.6,68.1,68.4);
 304   tcms->DefineSection(3,-74.0,60.9,61.2);
 305   //
 306   tcms->DefineSection(4,-74.0,60.1,61.2);
 307   tcms->DefineSection(5,-73.3,60.1,61.2);
 308   //
 309   tcms->DefineSection(6,-73.3,56.9,61.2);
 310   tcms->DefineSection(7,-73.0,56.9,61.2);
 311   //
 312   tcms->DefineSection(8,-73.0,56.9,58.8);
 313   tcms->DefineSection(9,-71.3,56.9,58.8);
 314   //
 315   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 316   //------------------------------------------------
 317   //  Heat screen muon side
 318   //------------------------------------------------
 319
 320   TGeoCone *thsm = new TGeoCone(89.8,67.88,68.1,60.68,60.9);
 321   TGeoCone *thsmw = new TGeoCone(89.8,67.94,68.04,60.74,60.84);
 322   TGeoVolume *hvsm = new TGeoVolume("TPC_HSM",thsm,mhs); //steel
 323   TGeoVolume *hvsmw = new TGeoVolume("TPC_HSMW",thsmw,m12); //water
 324   // assembly heat screen muon
 325   hvsm->AddNode(hvsmw,1);
 326   //-----------------------------------------------
 327   // inner containment vessel - shaft side
 328   //-----------------------------------------------
 329   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 330   //
 331   tcss->DefineSection(0,71.3,56.9,58.8);
 332   tcss->DefineSection(1,73.0,56.9,58.8);
 333   //
 334   tcss->DefineSection(2,73.0,56.9,61.2);
 335   tcss->DefineSection(3,73.3,56.9,61.2);
 336   //
 337   tcss->DefineSection(4,73.3,60.1,61.2);
 338   tcss->DefineSection(5,74.0,60.1,61.2);
 339   //
 340   tcss->DefineSection(6,74.0,60.9,61.2);
 341   tcss->DefineSection(7,253.6,65.6,65.9);
 342   //
 343   tcss->DefineSection(8,253.6,65.6,74.2);
 344   tcss->DefineSection(9,258.1,65.6,74.2);
 345   //
 346   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 347   //-------------------------------------------------
 348   //  Heat screen shaft side
 349   //--------------------------------------------------
 350   TGeoCone *thss = new TGeoCone(89.8,60.68,60.9,65.38,65.6);
 351   TGeoCone *thssw = new TGeoCone(89.8,60.74,60.84,65.44,65.54);
 352   TGeoVolume *hvss = new TGeoVolume("TPC_HSS",thss,mhs); //steel
 353   TGeoVolume *hvssw = new TGeoVolume("TPC_HSSW",thssw,m12); //water
 354   //assembly heat screen shaft
 355   hvss->AddNode(hvssw,1);
 356   //-----------------------------------------------
 357   //  Inner field cage
 358   //  define 4 parts and make an assembly
 359   //-----------------------------------------------
 360   // part1 - Al - 2 copies
 361   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 362   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 363   // sandwich - outermost parts - 2 copies
 364   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 365   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 366   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 367   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 368   //
 369   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 370   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 371   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 372   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 373   //
 374   // middle parts - 2 copies
 375   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 376   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 377   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 378   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 379   //
 380   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 381   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 382   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 383   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 384   // central part - 1 copy
 385   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 386   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 387   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 388   //
 389   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 390   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 391   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 392   //
 393   // inner part - positioning
 394   //
 395   // creating a sandwich
 396   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 397   //
 398   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 399   //
 400   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 401   //
 402   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 403   //
 404   tv100->AddNode(tv10,1);
 405   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 406   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 407   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 408   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 409   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 410   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 411   //
 412   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 413   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 414   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 415   v1->AddNode(hvsm,1,new TGeoTranslation(0.,0.,-163.8));
 416   v1->AddNode(hvss,1,new TGeoTranslation(0.,0.,163.8));
 417   v9->AddNode(tv100,1);
 418   //
 419   // central drum
 420   //
 421   // flange + sandwich
 422   //
 423   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 424   cfl->DefineSection(0,-71.1,59.7,61.2);
 425   cfl->DefineSection(1,-68.6,59.7,61.2);
 426   //
 427   cfl->DefineSection(2,-68.6,60.6324,61.2);
 428   cfl->DefineSection(3,68.6,60.6324,61.2);
 429   //
 430   cfl->DefineSection(4,68.6,59.7,61.2);
 431   cfl->DefineSection(5,71.1,59.7,61.2);
 432   //
 433   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 434   // sandwich
 435   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 436   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 437   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 438   //
 439   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 440   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 441   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 442   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 443   //
 444   // seals for central drum 2 copies
 445   //
 446   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 447   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 448   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 449   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 450   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 451   //
 452   // seal collars
 453   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 454   se->DefineSection(0,-72.8,59.7,61.2);
 455   se->DefineSection(1,-72.3,59.7,61.2);
 456   //
 457   se->DefineSection(2,-72.3,58.85,61.2);
 458   se->DefineSection(3,-71.6,58.85,61.2);
 459   //
 460   se->DefineSection(4,-71.6,59.7,61.2);
 461   se->DefineSection(5,-71.3,59.7,61.2);
 462   //
 463   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 464   //
 465   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 466   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 467   //
 468   // define reflection matrix
 469   //
 470   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 471   //
 472   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 473   //
 474   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 475   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 476   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 477   //
 478   // central membrane - 2 rings and a mylar membrane - assembly
 479   //
 480   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 481   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 482   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 483   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 484   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 485   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 486   //
 487   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 488   cm->AddNode(ihv,1);
 489   cm->AddNode(ohv,1);
 490   cm->AddNode(memv,1);
 491   v9->AddNode(cm,1);
 492   //
 493   // end caps - they are make as an assembly of single segments
 494   // containing both readout chambers
 495   //
 496   Double_t openingAngle = 10.*TMath::DegToRad();
 497   Double_t thick=1.5; // rib
 498   Double_t shift = thick/TMath::Sin(openingAngle);
 499   //
 500   Double_t lowEdge = 86.3; // hole in the wheel
 501   Double_t upEdge = 240.4; // hole in the wheel
 502   //
 503   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 504   //
 505   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 506   //
 507   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 508   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 509   //
 510   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 511   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 512   //
 513   Double_t ys = shift*TMath::Sin(openingAngle);
 514   Double_t xs = shift*TMath::Cos(openingAngle);
 515   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 516   tr->RegisterYourself();
 517   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 518   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 519   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 520   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 521   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 522   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 523   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 524   //
 525   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 526   //
 527   // readout chambers
 528   //
 529   // IROC first
 530   //
 531    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 532    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 533   // empty space
 534    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 535    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 536    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 537    //bars
 538    Double_t tga = (19.8328-12.3742)/39.3;
 539    Double_t xmin,xmax;
 540    xmin = 9.55*tga+12.3742;
 541    xmax = 9.95*tga+12.3742;
 542    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 543    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 544    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 545    xmin=19.4*tga+12.3742;
 546    xmax=19.9*tga+12.3742;
 547    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 548    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 549    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 550    xmin=29.35*tga+12.3742;
 551    xmax=29.75*tga+12.3742;
 552    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 553    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 554    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 555    //
 556    // holes for connectors
 557    //
 558    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 559    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 560    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 561    fileName += "/TPC/conn_iroc.dat";
 562    ifstream in;
 563    in.open(fileName.Data(), ios_base::in); // asci file
 564    for(Int_t i =0;i<86;i++){
 565       Double_t y = 3.99;
 566       Double_t x,z,ang;
 567       in>>x>>z>>ang;
 568       z-=26.5;
 569       TGeoRotation *rrr = new TGeoRotation();
 570       rrr->RotateY(ang);
 571       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 572       ibdv->AddNode(connv,i+1,trans);
 573    }
 574    in.close();
 575    // "cap"
 576    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 577    // "hole"
 578    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 579    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 580    tr1->RegisterYourself();
 581    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 582    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 583    //
 584    // pad plane and wire fixations
 585    //
 586    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 587    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 588    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 589    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 590    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 591    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 592    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 593    //
 594    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 595    //
 596    iroc->AddNode(ibdv,1);
 597    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 598    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 599    tga =(23.3521-14.5974)/49.65;
 600    Double_t xx = 24.825*tga+14.5974-0.6;
 601    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 602    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 603    //
 604    // OROC
 605    //
 606    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 607    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 608    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 609    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 610    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 611    //horizontal bars
 612    tga=(38.5084-20.2938)/99.3;
 613    xmin=tga*10.2+20.2938;
 614    xmax=tga*10.6+20.2938;
 615    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 616    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 617    //
 618    xmin=22.55*tga+20.2938;
 619    xmax=24.15*tga+20.2938;
 620    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 621    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 622    //
 623    xmin=36.1*tga+20.2938;
 624    xmax=36.5*tga+20.2938;
 625    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 626    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 627    //
 628    xmin=49.0*tga+20.2938;
 629    xmax=50.6*tga+20.2938;
 630    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 631    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 632    //
 633    xmin=63.6*tga+20.2938;
 634    xmax=64.0*tga+20.2938;
 635    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 636    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 637    //
 638    xmin=75.5*tga+20.2938;
 639    xmax=77.15*tga+20.2938;
 640    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 641    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 642    //
 643    xmin=88.7*tga+20.2938;
 644    xmax=89.1*tga+20.2938;
 645    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 646    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 647    //
 648    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 649    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 650    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 651    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 652    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 653    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 654    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 655    // vertical bars
 656    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 657    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 658    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 659    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 660    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 661    //
 662    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 663    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 664    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 665    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 666    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 667    //
 668    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 669    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 670    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 671    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 672    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 673    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 674    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 675    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 676    //
 677    // holes for connectors
 678    //
 679    fileName = gSystem->Getenv("ALICE_ROOT");
 680    fileName += "/TPC/conn_oroc.dat";
 681    in.open(fileName.Data(), ios_base::in); // asci file
 682    for(Int_t i =0;i<78;i++){
 683       Double_t y =3.89;
 684       Double_t x,z,ang;
 685       Double_t x1,z1,x2,z2;
 686       in>>x>>z>>ang;
 687       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 688       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 689       //
 690       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 691       //
 692       TGeoRotation *rr = new TGeoRotation();
 693       rr->RotateY(ang);
 694       z1-=54.95;
 695       z2-=54.95;
 696       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 697       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 698       obdv->AddNode(connv,i+1,trans1);
 699       obdv->AddNode(connv,i+79,trans2);
 700    }
 701    in.close();
 702    // cap
 703    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 704    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 705    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 706    tr5->RegisterYourself();
 707    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 708    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 709    //
 710    // pad plane and wire fixations
 711    //
 712    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 713    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 714    //
 715    tga=(43.5239-23.3874)/114.2;
 716    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 717    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 718    xx = 57.1*tga+23.3874-0.7;
 719    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 720    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 721    //
 722    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 723    //
 724    oroc->AddNode(obdv,1);
 725    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 726    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 727    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 728    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 729    //
 730    // now iroc and oroc are placed into a sector...
 731    //
 732    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 733    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 734    TGeoRotation rot1("rot1",90.,90.,0.);
 735    TGeoRotation rot2("rot2");
 736    rot2.RotateY(10.);
 737    TGeoRotation *rot = new TGeoRotation("rot");
 738    *rot=rot1*rot2;
 739    //
 740    Double_t x0,y0;
 741    x0=110.2*TMath::Cos(openingAngle);
 742    y0=110.2*TMath::Sin(openingAngle);
 743    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 744    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 745    x0=188.45*TMath::Cos(openingAngle);
 746    y0=188.45*TMath::Sin(openingAngle);
 747    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 748    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 749    //
 750    // A-side
 751    //
 752    secta->AddNode(ch,1);
 753    secta->AddNode(iroc,1,combi1a);
 754    secta->AddNode(oroc,1,combi2a);
 755    //
 756    // C-side
 757    //
 758    sectc->AddNode(ch,1);
 759    sectc->AddNode(iroc,1,combi1c);
 760    sectc->AddNode(oroc,1,combi2c);
 761    //
 762    // now I try to make  wheels...
 763    //
 764    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 765    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 766    //
 767    for(Int_t i =0;i<18;i++){
 768      Double_t phi = (20.*i);
 769      TGeoRotation *r = new TGeoRotation();
 770      r->RotateZ(phi);
 771      wheela->AddNode(secta,i+1,r);
 772      wheelc->AddNode(sectc,i+1,r);
 773
 774    }
 775    // wheels in the drift volume!
 776    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 777    v9->AddNode(wheela,1,combi3);
 778    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 779
 780    //_____________________________________________________________
 781    // service support wheel
 782    //_____________________________________________________________
 783   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 784   sw->DefineSection(0,-4.,80.5,251.75);
 785   sw->DefineSection(1,4.,80.5,251.75);
 786   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 787   //
 788   thick=1.;
 789   shift = thick/TMath::Sin(openingAngle);
 790   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 791   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 792   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 793   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 794   //
 795   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 796   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 797   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 798   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 799   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 800   //
 801   shv->AddNode(elv,1);
 802   //
 803   //
 804   ys = shift*TMath::Sin(openingAngle);
 805   xs = shift*TMath::Cos(openingAngle);
 806   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 807   // cover
 808   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 809   co->DefineSection(0,-0.5,77.,255.25);
 810   co->DefineSection(1,0.5,77.,255.25);
 811   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 812   // hole in a cover
 813   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 814   shift=4./TMath::Sin(openingAngle);
 815   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 816   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 817   //
 818   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 819   //
 820   ys = shift*TMath::Sin(openingAngle);
 821   xs = shift*TMath::Cos(openingAngle);
 822   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 823   //
 824   // Sector as an Assembly
 825   //
 826   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 827   swhs->AddNode(swv,1);
 828   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 829   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 830   //
 831   // SSW as an Assembly of sectors
 832   //
 833  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 834    for(Int_t i =0;i<18;i++){
 835      Double_t phi = (20.*i);
 836      TGeoRotation *r = new TGeoRotation();
 837      r->RotateZ(phi);
 838      swheel->AddNode(swhs,i+1,r);
 839    }
 840    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 841    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 842
 843    // sensitive strips
 844    TGeoMedium *m8 = gGeoManager->GetMedium("TPC_Ne-CO2-2");
 845    Int_t totrows;
 846    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 847    Double_t *upar;
 848    upar=NULL;
 849    gGeoManager->Volume("TPC_Strip","PGON",m8->GetId(),upar);
 850    upar=new Double_t [10];
 851    upar[0]=0.;
 852    upar[1]=360.;
 853    upar[2]=18.;
 854    upar[3]=2.;
 855    //
 856    upar[4]=-124.8;
 857    upar[7]=124.8;
 858
 859    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 860
 861    upar[5]=rlow;
 862    upar[6]=rlow+.01;
 863    upar[8]=upar[5];
 864    upar[9]=upar[6];
 865    //
 866    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 867    gGeoManager->Node("TPC_Strip",totrows+1,
 868                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 869    //
 870    // now, strips
 871    //
 872      //lower sectors
 873      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 874        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 875        upar[5]=rlow;
 876        upar[6]=rlow+.01;
 877        upar[8]=upar[5];
 878        upar[9]=upar[6];
 879        gGeoManager->Node("TPC_Strip",i,
 880                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 881        gGeoManager->Node("TPC_Strip",totrows+i,
 882                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 883      }
 884      //upper sectors
 885      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 886        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 887        upar[5]=rlow;
 888        upar[6]=rlow+.01;
 889        upar[8]=upar[5];
 890        upar[9]=upar[6];
 891        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 892                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 893        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 894                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 895      }
 896
 897   //----------------------------------------------------------
 898   // TPc Support Rods - MAKROLON
 899   //----------------------------------------------------------
 900   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 901   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 902   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 903   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 904   // upper and lower rods differ in length!
 905   delete [] upar;
 906   upar=NULL;
 907   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 908   upar=new Double_t [3];
 909   upar[0]=1.8;
 910   upar[1]=2.2;
 911
 912   //
 913   //HV rods - makrolon + 0.58cm (diameter) Cu
 914   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 915   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 916   //
 917   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 918   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 919   hvrv->AddNode(hvcv,1);
 920   //
 921   // resistor rods
 922   //
 923   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 924   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 925   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 926   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 927   //
 928   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 929   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 930   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 931   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 932   //
 933   // ceramic rod with water
 934   //
 935   criv->AddNode(cwiv,1);
 936   crov->AddNode(cwov,1);
 937   //
 938   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 939   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 940   //
 941   // peek rod
 942   //
 943   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 944   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 945   //
 946   // resistor rods assembly
 947   //
 948    TGeoRotation *rotr = new TGeoRotation("rotr");
 949    rotr->RotateZ(-21.);
 950   //
 951   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 952   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 953   //
 954   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 955   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 956   //
 957   //
 958   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 959   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 960   rrin->AddNode(rriv,1);
 961   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 962   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 963   rrin->AddNode(priv,1);
 964   //
 965   rrou->AddNode(rrov,1);
 966   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 967   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 968   rrou->AddNode(prov,1);
 969   for(Int_t i=0;i<18;i++){
 970     Double_t angle,x,y;
 971     Double_t z,r;
 972     angle=TMath::DegToRad()*20.*(Double_t)i;
 973     r=81.5;
 974     x=r * TMath::Cos(angle);
 975     y=r * TMath::Sin(angle);
 976     upar[2]=126.64; //lower
 977     z= 126.96;
 978     if(i==3){
 979       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 980       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 981     }
 982     else {
 983       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 984       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 985     }
 986
 987     //
 988     r=254.25;
 989     x=r * TMath::Cos(angle);
 990     y=r * TMath::Sin(angle);
 991     upar[2]=126.54; //upper
 992     z=127.06;
 993     //
 994     if(i==15){
 995       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 996      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 997       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 998     }
 999     else if(i==11){
1000       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
1001       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
1002     }
1003     else{
1004     //
1005       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
1006       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
1007     }
1008     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
1009     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
1010   }
1011
1012   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
1013   alice->AddNode(v1,1);
1014
1015 } // end of function
1016
1017
1018 //_____________________________________________________________________________
1019 void AliTPCv1::CreateMaterials()
1020 {
1021   //
1022   // Define materials for Time Projection Chamber
1023   //
1024   AliTPC::CreateMaterials();
1025 }
1026
1027 //_____________________________________________________________________________
1028 void AliTPCv1::Init()
1029 {
1030   //
1031   // Initialises TPC detector after it has been created
1032   //
1033
1034   fIdSens=gMC->VolId("TPC_Strip"); // sensitive strip
1035
1036   printf("%s: *** TPC version 1 initialized***\n",ClassName());
1037
1038   // printf("TPC version 1 initialized\n");
1039 }
1040
1041 //_____________________________________________________________________________
1042 void AliTPCv1::StepManager()
1043 {
1044   //
1045   // Called at every step in the Time Projection Chamber
1046   //
1047   Int_t         copy, id, i;
1048   Float_t       hits[5];
1049   Int_t         vol[2];
1050   TLorentzVector p;
1051  //
1052
1053   id = gMC->CurrentVolID(copy);
1054   if(id!=fIdSens) return;
1055   if(gMC->TrackCharge() && gMC->IsTrackEntering()) {
1056
1057     //
1058     // Only charged tracks entering the sensitive volume
1059     //
1060
1061       gMC->TrackPosition(p);
1062   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1063   //
1064
1065   //
1066   Double_t angle = TMath::ACos(p[0]/r);
1067   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1068   //
1069   // angular segment, it is not a real sector number...
1070   //
1071   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1072                fTPCParam->GetInnerAngle());
1073   // rotate to segment "0"
1074   Float_t cos,sin;
1075   fTPCParam->AdjustCosSin(sector,cos,sin);
1076   Float_t x1 = p[0]*cos + p[1]*sin;
1077   Float_t y1 = TMath::Abs(-p[0]*sin + p[1]*cos);
1078   // calculate real sector number...
1079   if (x1>fTPCParam->GetOuterRadiusLow()){
1080     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1081              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1082     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1083   }
1084     else
1085       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1086   //
1087   // here I have a sector number
1088   //
1089   vol[0]=sector;
1090   //
1091   Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1092   vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1093   // row numbers are autonomous for lower and upper sectors
1094   if(vol[0] > fTPCParam->GetNInnerSector()) {
1095      vol[1] -= fTPCParam->GetNRowLow();
1096   }
1097   Double_t range = (sector<36) ? fTPCParam->GetYInner(vol[1]) :
1098                    fTPCParam->GetYOuter(vol[1]);
1099   if(y1>range) return;
1100      if(vol[1] == 0){
1101
1102         // because Jouri wants to have this
1103
1104         gMC->TrackMomentum(p);
1105         hits[0]=p[0];
1106         hits[1]=p[1];
1107         hits[2]=p[2];
1108         hits[3]=0.; // this hit has no energy loss
1109         // Get also the track time for pileup simulation
1110         hits[4]=gMC->TrackTime();
1111
1112         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.
1113      }
1114    gMC->TrackPosition(p);
1115       for(i=0;i<3;++i) hits[i]=p[i];
1116       hits[3]=1; //I'd like to have something positive here (I.Belikov)
1117       // Get also the track time for pileup simulation
1118       hits[4]=gMC->TrackTime();
1119
1120       AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.
1121
1122   }// track entering sensitive strip
1123
1124 }
1125 //_____________________________________________________________________________
1126
1127
1128