TPC/AliTPCv3.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 3 -- detailed TPC and slow simulation    //
  22 //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv3Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 #include <stdlib.h>
  33
  34 #include <TInterpreter.h>
  35 #include <TLorentzVector.h>
  36 #include <TMath.h>
  37 #include <TVirtualMC.h>
  38 #include <TPDGCode.h>
  39 #include <TString.h>
  40 #include <TSystem.h>
  41
  42 #include "AliConst.h"
  43 #include "AliRun.h"
  44 #include "AliMathBase.h"
  45 #include "AliTPCDigitsArray.h"
  46 #include "AliTPCParam.h"
  47 #include "AliTPCParamSR.h"
  48 #include "AliTPCTrackHitsV2.h"
  49 #include "AliTPCv3.h"
  50 #include "AliMC.h"
  51 #include "TGeoManager.h"
  52 #include "TGeoVolume.h"
  53 #include "TGeoPcon.h"
  54 #include "TGeoTube.h"
  55 #include "TGeoPgon.h"
  56 #include "TGeoTrd1.h"
  57 #include "TGeoCompositeShape.h"
  58 #include "TGeoPara.h"
  59
  60 ClassImp(AliTPCv3)
  61 //_____________________________________________________________________________
  62
  63   AliTPCv3::AliTPCv3():AliTPC(),fIdSens(0)
  64 {
  65
  66   fHitType = 1;
  67
  68 }
  69
  70 //_____________________________________________________________________________
  71 AliTPCv3::AliTPCv3(const char *name, const char *title) :
  72   AliTPC(name, title), fIdSens(0)
  73 {
  74   //
  75   // Standard constructor for Time Projection Chamber version 3
  76   //
  77
  78   SetBufferSize(128000);
  79
  80   if (fTPCParam)
  81      fTPCParam->Write(fTPCParam->GetTitle());
  82
  83   fHitType =1;
  84 }
  85
  86 //_____________________________________________________________________________
  87 void AliTPCv3::CreateGeometry()
  88 {
  89   //
  90   // Creation of the TPC coarse geometry (version 3)
  91   // The whole drift volume is sensitive
  92   // Origin Marek Kowalski Cracow
  93   //
  94   //Begin_Html
  95   /*
  96     <img src="picts/AliTPCgif">
  97   */
  98   //End_Html
  99   //Begin_Html
 100   /*
 101     <img src="picts/AliTPCv3Tree.gif">
 102   */
 103   //End_Html
 104    //----------------------------------------------------------
 105   // This geometry is written using TGeo class
 106   // Firstly the shapes are defined, and only then the volumes
 107   // What is recognized by the MC are volumes
 108   //----------------------------------------------------------
 109   //
 110   //  tpc - this will be the mother volume
 111   //
 112
 113   //
 114   // here I define a volume TPC
 115   // retrive the medium name with "TPC_" as a leading string
 116   //
 117   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
 118   //
 119   tpc->DefineSection(0,-291.,77.,278.);
 120   tpc->DefineSection(1,-270,77.,278.);
 121   //
 122   tpc->DefineSection(2,-270.,77.,278.);
 123   tpc->DefineSection(3,-259.6,70.,278.);
 124   //
 125   tpc->DefineSection(4,-259.6,68.1,278.);
 126   tpc->DefineSection(5,-253.6,68.1,278.);
 127   //
 128   tpc->DefineSection(6,-253.6,68.,278.);
 129   tpc->DefineSection(7,-74.0,60.8,278.);
 130   //
 131   tpc->DefineSection(8,-74.0,60.1,278.);
 132   tpc->DefineSection(9,-73.3,60.1,278.);
 133   //
 134   tpc->DefineSection(10,-73.3,56.9,278.);
 135   tpc->DefineSection(11,73.3,56.9,278.);
 136   //
 137   tpc->DefineSection(12,73.3,60.1,278.);
 138   tpc->DefineSection(13,74.0,60.1,278.);
 139   //
 140   tpc->DefineSection(14,74.0,60.8,278.);
 141   tpc->DefineSection(15,253.6,65.5,278.);
 142   //
 143   tpc->DefineSection(16,253.6,65.6,278.);
 144   tpc->DefineSection(17,259.6,65.6,278.);
 145   //
 146   tpc->DefineSection(18,259.6,70.0,278.);
 147   tpc->DefineSection(19,291.,77.,278.);
 148   //
 149   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 150   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 151   //
 152   // drift volume - sensitive volume, extended beyond the
 153   // endcaps, because of the alignment
 154   //
 155   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 156   dvol->DefineSection(0,-260.,74.5,264.4);
 157   dvol->DefineSection(1,-253.6,74.5,264.4);
 158   //
 159   dvol->DefineSection(2,-253.6,76.6774,258.);
 160   dvol->DefineSection(3,253.6,76.6774,258.);
 161   //
 162   dvol->DefineSection(4,253.6,74.5,264.4);
 163   dvol->DefineSection(5,260.,74.5,264.4);
 164   //
 165   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 166   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 167   //
 168   v1->AddNode(v9,1);
 169   //
 170   // outer insulator
 171   //
 172   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 173   //
 174   tpco->DefineSection(0,-256.6,264.8,278.);
 175   tpco->DefineSection(1,-253.6,264.8,278.);
 176   //
 177   tpco->DefineSection(2,-253.6,258.,278.);
 178   tpco->DefineSection(3,250.6,258.,278.);
 179   //
 180   tpco->DefineSection(4,250.6,258.,275.5);
 181   tpco->DefineSection(5,253.6,258.,275.5);
 182   //
 183   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 184   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 185   //
 186   // outer containment vessel
 187   //
 188   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 189   //
 190   tocv->DefineSection(0,-256.6,264.8,278.);
 191   tocv->DefineSection(1,-253.6,264.8,278.);
 192   //
 193   tocv->DefineSection(2,-253.6,274.8124,278.);
 194   tocv->DefineSection(3,247.6,274.8124,278.);
 195   //
 196   tocv->DefineSection(4,247.6,270.4,278.);
 197   tocv->DefineSection(5,250.6,270.4,278.);
 198   //
 199   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 200   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 201   //
 202   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 203   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 204   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 205   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 206   //
 207   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 208   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 209   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 210   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 211   //
 212   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 213   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 214   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 215   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 216
 217   //-------------------------------------------------------
 218   //  Tpc Outer Field Cage
 219   //  daughters - composite (sandwich)
 220   //-------------------------------------------------------
 221
 222   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 223   //
 224   tofc->DefineSection(0,-253.6,258.,269.6);
 225   tofc->DefineSection(1,-250.6,258.,269.6);
 226   //
 227   tofc->DefineSection(2,-250.6,258.,260.0676);
 228   tofc->DefineSection(3,250.6,258.,260.0676);
 229   //
 230   tofc->DefineSection(4,250.6,258.,275.5);
 231   tofc->DefineSection(5,253.6,258.,275.5);
 232   //
 233   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 234   //sandwich
 235   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 236   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 237   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 238   //
 239   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 240   //
 241   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 242   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 243   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 244   //
 245   // outer part - positioning
 246   //
 247   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 248   //
 249   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 250   //
 251   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 252   //
 253   v2->AddNode(v3,1); v2->AddNode(v4,1);
 254   //
 255   v1->AddNode(v2,1);
 256   //-----------------------------------------------------------
 257
 258
 259
 260
 261
 262
 263   //--------------------------------------------------------------------
 264   // Tpc Inner INsulator (CO2)
 265   // the cones, the central drum and the inner f.c. sandwich with a piece
 266   // of the flane will be placed in the TPC
 267   //--------------------------------------------------------------------
 268   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 269   //
 270   tpci->DefineSection(0,-253.6,68.4,76.6774);
 271   tpci->DefineSection(1,-74.0,61.2,76.6774);
 272   //
 273   tpci->DefineSection(2,74.0,61.2,76.6774);
 274   //
 275   tpci->DefineSection(3,253.6,65.9,76.6774);
 276   //
 277   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 278   //
 279   // now the inner field cage - only part of flanges (2 copies)
 280   //
 281   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 282   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 283   //
 284  //---------------------------------------------------------
 285   // Tpc Inner Containment vessel - Muon side
 286   //---------------------------------------------------------
 287   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 288   //
 289   tcms->DefineSection(0,-259.1,68.1,74.2);
 290   tcms->DefineSection(1,-253.6,68.1,74.2);
 291   //
 292   tcms->DefineSection(2,-253.6,68.1,68.4);
 293   tcms->DefineSection(3,-74.0,60.9,61.2);
 294   //
 295   tcms->DefineSection(4,-74.0,60.1,61.2);
 296   tcms->DefineSection(5,-73.3,60.1,61.2);
 297   //
 298   tcms->DefineSection(6,-73.3,56.9,61.2);
 299   tcms->DefineSection(7,-73.0,56.9,61.2);
 300   //
 301   tcms->DefineSection(8,-73.0,56.9,58.8);
 302   tcms->DefineSection(9,-71.3,56.9,58.8);
 303   //
 304   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 305   //-----------------------------------------------
 306   // inner containment vessel - shaft side
 307   //-----------------------------------------------
 308   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 309   //
 310   tcss->DefineSection(0,71.3,56.9,58.8);
 311   tcss->DefineSection(1,73.0,56.9,58.8);
 312   //
 313   tcss->DefineSection(2,73.0,56.9,61.2);
 314   tcss->DefineSection(3,73.3,56.9,61.2);
 315   //
 316   tcss->DefineSection(4,73.3,60.1,61.2);
 317   tcss->DefineSection(5,74.0,60.1,61.2);
 318   //
 319   tcss->DefineSection(6,74.0,60.9,61.2);
 320   tcss->DefineSection(7,253.6,65.6,65.9);
 321   //
 322   tcss->DefineSection(8,253.6,65.6,74.2);
 323   tcss->DefineSection(9,258.1,65.6,74.2);
 324   //
 325   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 326   //-----------------------------------------------
 327   //  Inner field cage
 328   //  define 4 parts and make an assembly
 329   //-----------------------------------------------
 330   // part1 - Al - 2 copies
 331   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 332   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 333   // sandwich - outermost parts - 2 copies
 334   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 335   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 336   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 337   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 338   //
 339   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 340   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 341   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 342   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 343   //
 344   // middle parts - 2 copies
 345   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 346   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 347   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 348   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 349   //
 350   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 351   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 352   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 353   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 354   // central part - 1 copy
 355   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 356   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 357   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 358   //
 359   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 360   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 361   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 362   //
 363   // inner part - positioning
 364   //
 365   // creating a sandwich
 366   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 367   //
 368   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 369   //
 370   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 371   //
 372   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 373   //
 374   tv100->AddNode(tv10,1);
 375   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 376   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 377   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 378   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 379   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 380   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 381   //
 382   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 383   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 384   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 385   v9->AddNode(tv100,1);
 386   //
 387   // central drum
 388   //
 389   // flange + sandwich
 390   //
 391   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 392   cfl->DefineSection(0,-71.1,59.7,61.2);
 393   cfl->DefineSection(1,-68.6,59.7,61.2);
 394   //
 395   cfl->DefineSection(2,-68.6,60.6324,61.2);
 396   cfl->DefineSection(3,68.6,60.6324,61.2);
 397   //
 398   cfl->DefineSection(4,68.6,59.7,61.2);
 399   cfl->DefineSection(5,71.1,59.7,61.2);
 400   //
 401   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 402   // sandwich
 403   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 404   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 405   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 406   //
 407   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 408   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 409   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 410   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 411   //
 412   // seals for central drum 2 copies
 413   //
 414   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 415   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 416   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 417   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 418   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 419   //
 420   // seal collars
 421   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 422   se->DefineSection(0,-72.8,59.7,61.2);
 423   se->DefineSection(1,-72.3,59.7,61.2);
 424   //
 425   se->DefineSection(2,-72.3,58.85,61.2);
 426   se->DefineSection(3,-71.6,58.85,61.2);
 427   //
 428   se->DefineSection(4,-71.6,59.7,61.2);
 429   se->DefineSection(5,-71.3,59.7,61.2);
 430   //
 431   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 432   //
 433   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 434   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 435   //
 436   // define reflection matrix
 437   //
 438   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 439   //
 440   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 441   //
 442   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 443   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 444   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 445   //
 446   // central membrane - 2 rings and a mylar membrane - assembly
 447   //
 448   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 449   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 450   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 451   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 452   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 453   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 454   //
 455   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 456   cm->AddNode(ihv,1);
 457   cm->AddNode(ohv,1);
 458   cm->AddNode(memv,1);
 459   v9->AddNode(cm,1);
 460   //
 461   // end caps - they are make as an assembly of single segments
 462   // containing both readout chambers
 463   //
 464   Double_t openingAngle = 10.*TMath::DegToRad();
 465   Double_t thick=1.5; // rib
 466   Double_t shift = thick/TMath::Sin(openingAngle);
 467   //
 468   Double_t lowEdge = 86.3; // hole in the wheel
 469   Double_t upEdge = 240.4; // hole in the wheel
 470   //
 471   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 472   //
 473   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 474   //
 475   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 476   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 477   //
 478   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 479   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 480   //
 481   Double_t ys = shift*TMath::Sin(openingAngle);
 482   Double_t xs = shift*TMath::Cos(openingAngle);
 483   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 484   tr->RegisterYourself();
 485   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 486   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 487   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 488   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 489   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 490   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 491   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 492   //
 493   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 494   //
 495   // readout chambers
 496   //
 497   // IROC first
 498   //
 499    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 500    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 501   // empty space
 502    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 503    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 504    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 505    //bars
 506    Double_t tga = (19.8328-12.3742)/39.3;
 507    Double_t xmin,xmax;
 508    xmin = 9.55*tga+12.3742;
 509    xmax = 9.95*tga+12.3742;
 510    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 511    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 512    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 513    xmin=19.4*tga+12.3742;
 514    xmax=19.9*tga+12.3742;
 515    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 516    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 517    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 518    xmin=29.35*tga+12.3742;
 519    xmax=29.75*tga+12.3742;
 520    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 521    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 522    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 523    //
 524    // holes for connectors
 525    //
 526    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 527    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 528    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 529    fileName += "/TPC/conn_iroc.dat";
 530    ifstream in;
 531    in.open(fileName.Data(), ios_base::in); // asci file
 532    for(Int_t i =0;i<86;i++){
 533       Double_t y = 3.99;
 534       Double_t x,z,ang;
 535       in>>x>>z>>ang;
 536       z-=26.5;
 537       TGeoRotation *rrr = new TGeoRotation();
 538       rrr->RotateY(ang);
 539       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 540       ibdv->AddNode(connv,i+1,trans);
 541    }
 542    in.close();
 543    // "cap"
 544    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 545    // "hole"
 546    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 547    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 548    tr1->RegisterYourself();
 549    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 550    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 551    //
 552    // pad plane and wire fixations
 553    //
 554    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 555    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 556    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 557    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 558    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 559    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 560    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 561    //
 562    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 563    //
 564    iroc->AddNode(ibdv,1);
 565    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 566    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 567    tga =(23.3521-14.5974)/49.65;
 568    Double_t xx = 24.825*tga+14.5974-0.6;
 569    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 570    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 571    //
 572    // OROC
 573    //
 574    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 575    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 576    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 577    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 578    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 579    //horizontal bars
 580    tga=(38.5084-20.2938)/99.3;
 581    xmin=tga*10.2+20.2938;
 582    xmax=tga*10.6+20.2938;
 583    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 584    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 585    //
 586    xmin=22.55*tga+20.2938;
 587    xmax=24.15*tga+20.2938;
 588    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 589    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 590    //
 591    xmin=36.1*tga+20.2938;
 592    xmax=36.5*tga+20.2938;
 593    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 594    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 595    //
 596    xmin=49.0*tga+20.2938;
 597    xmax=50.6*tga+20.2938;
 598    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 599    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 600    //
 601    xmin=63.6*tga+20.2938;
 602    xmax=64.0*tga+20.2938;
 603    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 604    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 605    //
 606    xmin=75.5*tga+20.2938;
 607    xmax=77.15*tga+20.2938;
 608    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 609    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 610    //
 611    xmin=88.7*tga+20.2938;
 612    xmax=89.1*tga+20.2938;
 613    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 614    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 615    //
 616    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 617    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 618    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 619    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 620    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 621    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 622    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 623    // vertical bars
 624    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 625    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 626    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 627    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 628    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 629    //
 630    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 631    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 632    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 633    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 634    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 635    //
 636    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 637    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 638    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 639    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 640    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 641    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 642    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 643    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 644    //
 645    // holes for connectors
 646    //
 647    fileName = gSystem->Getenv("ALICE_ROOT");
 648    fileName += "/TPC/conn_oroc.dat";
 649    in.open(fileName.Data(), ios_base::in); // asci file
 650    for(Int_t i =0;i<78;i++){
 651       Double_t y =3.89;
 652       Double_t x,z,ang;
 653       Double_t x1,z1,x2,z2;
 654       in>>x>>z>>ang;
 655       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 656       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 657       //
 658       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 659       //
 660       TGeoRotation *rr = new TGeoRotation();
 661       rr->RotateY(ang);
 662       z1-=54.95;
 663       z2-=54.95;
 664       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 665       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 666       obdv->AddNode(connv,i+1,trans1);
 667       obdv->AddNode(connv,i+79,trans2);
 668    }
 669    in.close();
 670    // cap
 671    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 672    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 673    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 674    tr5->RegisterYourself();
 675    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 676    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 677    //
 678    // pad plane and wire fixations
 679    //
 680    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 681    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 682    //
 683    tga=(43.5239-23.3874)/114.2;
 684    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 685    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 686    xx = 57.1*tga+23.3874-0.7;
 687    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 688    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 689    //
 690    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 691    //
 692    oroc->AddNode(obdv,1);
 693    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 694    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 695    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 696    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 697    //
 698    // now iroc and oroc are placed into a sector...
 699    //
 700    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 701    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 702    TGeoRotation rot1("rot1",90.,90.,0.);
 703    TGeoRotation rot2("rot2");
 704    rot2.RotateY(10.);
 705    TGeoRotation *rot = new TGeoRotation("rot");
 706    *rot=rot1*rot2;
 707    //
 708    Double_t x0,y0;
 709    x0=110.2*TMath::Cos(openingAngle);
 710    y0=110.2*TMath::Sin(openingAngle);
 711    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 712    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 713    x0=188.45*TMath::Cos(openingAngle);
 714    y0=188.45*TMath::Sin(openingAngle);
 715    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 716    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 717    //
 718    // A-side
 719    //
 720    secta->AddNode(ch,1);
 721    secta->AddNode(iroc,1,combi1a);
 722    secta->AddNode(oroc,1,combi2a);
 723    //
 724    // C-side
 725    //
 726    sectc->AddNode(ch,1);
 727    sectc->AddNode(iroc,1,combi1c);
 728    sectc->AddNode(oroc,1,combi2c);
 729    //
 730    // now I try to make  wheels...
 731    //
 732    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 733    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 734    //
 735    for(Int_t i =0;i<18;i++){
 736      Double_t phi = (20.*i);
 737      TGeoRotation *r = new TGeoRotation();
 738      r->RotateZ(phi);
 739      wheela->AddNode(secta,i+1,r);
 740      wheelc->AddNode(sectc,i+1,r);
 741
 742    }
 743    // wheels in the drift volume!
 744    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 745    v9->AddNode(wheela,1,combi3);
 746    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 747
 748    //_____________________________________________________________
 749    // service support wheel
 750    //_____________________________________________________________
 751   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 752   sw->DefineSection(0,-4.,80.5,251.75);
 753   sw->DefineSection(1,4.,80.5,251.75);
 754   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 755   //
 756   thick=1.;
 757   shift = thick/TMath::Sin(openingAngle);
 758   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 759   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 760   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 761   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 762   //
 763   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 764   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 765   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 766   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 767   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 768   //
 769   shv->AddNode(elv,1);
 770   //
 771   ys = shift*TMath::Sin(openingAngle);
 772   xs = shift*TMath::Cos(openingAngle);
 773   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 774   // cover
 775   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 776   co->DefineSection(0,-0.5,77.,255.25);
 777   co->DefineSection(1,0.5,77.,255.25);
 778   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 779   // hole in a cover
 780   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 781   shift=4./TMath::Sin(openingAngle);
 782   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 783   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 784   //
 785   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 786   //
 787   ys = shift*TMath::Sin(openingAngle);
 788   xs = shift*TMath::Cos(openingAngle);
 789   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 790   //
 791   // Sector as an Assembly
 792   //
 793   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 794   swhs->AddNode(swv,1);
 795   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 796   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 797   //
 798   // SSW as an Assembly of sectors
 799   //
 800  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 801    for(Int_t i =0;i<18;i++){
 802      Double_t phi = (20.*i);
 803      TGeoRotation *r = new TGeoRotation();
 804      r->RotateZ(phi);
 805      swheel->AddNode(swhs,i+1,r);
 806    }
 807    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 808    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 809    //
 810   //----------------------------------------------------------
 811   // TPc Support Rods - MAKROLON
 812   //----------------------------------------------------------
 813   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 814   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 815   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 816   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 817   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 818   // upper and lower rods differ in length!
 819   Double_t *upar;
 820   upar=NULL;
 821   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 822   upar=new Double_t [3];
 823   upar[0]=1.8;
 824   upar[1]=2.2;
 825
 826   //
 827   //HV rods - makrolon + 0.58cm (diameter) Cu
 828   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 829   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 830   //
 831   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 832   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 833   hvrv->AddNode(hvcv,1);
 834   //
 835   // resistor rods
 836   //
 837   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner
 838   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer
 839   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
 840   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
 841   //
 842   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
 843   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);
 844   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
 845   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);
 846   //
 847   // ceramic rod with water
 848   //
 849   criv->AddNode(cwiv,1);
 850   crov->AddNode(cwov,1);
 851   //
 852   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner
 853   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer
 854   //
 855   // peek rod
 856   //
 857   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
 858   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
 859   //
 860   // resistor rods assembly
 861   //
 862    TGeoRotation *rotr = new TGeoRotation("rotr");
 863    rotr->RotateZ(-21.);
 864   //
 865   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
 866   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
 867   //
 868   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
 869   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);
 870   //
 871   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
 872   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
 873   rrin->AddNode(rriv,1);
 874   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
 875   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.));
 876   rrin->AddNode(priv,1);
 877   //
 878   rrou->AddNode(rrov,1);
 879   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
 880   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.));
 881   rrou->AddNode(prov,1);
 882   for(Int_t i=0;i<18;i++){
 883     Double_t angle,x,y;
 884     Double_t z,r;
 885     angle=TMath::DegToRad()*20.*(Double_t)i;
 886     r=81.5;
 887     x=r * TMath::Cos(angle);
 888     y=r * TMath::Sin(angle);
 889     upar[2]=126.64; //lower
 890     z= 126.96;
 891     //
 892     if(i==3){
 893       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 894       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 895     }
 896     else {
 897       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 898       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 899     }
 900
 901
 902     //
 903     r=254.25;
 904     x=r * TMath::Cos(angle);
 905     y=r * TMath::Sin(angle);
 906     upar[2]=126.54; //upper
 907     z=127.06;
 908     if(i==15){
 909       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
 910       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
 911       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 912     }
 913     else if(i==11){
 914       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
 915       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
 916     }
 917     else{
 918     //
 919       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 920       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 921     }
 922   }
 923
 924   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 925   alice->AddNode(v1,1);
 926
 927
 928
 929 } // end of function
 930
 931 //_____________________________________________________________________________
 932 void AliTPCv3::DrawDetector() const
 933 {
 934   //
 935   // Draw a shaded view of the Time Projection Chamber version 3
 936   //
 937
 938
 939   // Set everything unseen
 940   gMC->Gsatt("*", "seen", -1);
 941   //
 942   // Set ALIC mother transparent
 943   gMC->Gsatt("ALIC","SEEN",0);
 944   //
 945   // Set the volumes visible
 946   //
 947
 948   gMC->Gsatt("TPC ","SEEN",0);
 949   gMC->Gsatt("TOIN","SEEN",1);
 950   gMC->Gsatt("TOIN","COLO",7);
 951   gMC->Gsatt("TOCV","SEEN",1);
 952   gMC->Gsatt("TOCV","COLO",4);
 953   gMC->Gsatt("TSA1","SEEN",0);
 954   gMC->Gsatt("TSA2","SEEN",0);
 955   gMC->Gsatt("TSA3","SEEN",0);
 956   gMC->Gsatt("TSA4","SEEN",0);
 957   gMC->Gsatt("TSA5","SEEN",0);
 958   gMC->Gsatt("TOFC","SEEN",1);
 959   gMC->Gsatt("TOFC","COLO",4);
 960   gMC->Gsatt("TSA6","SEEN",0);
 961   gMC->Gsatt("TSA7","SEEN",0);
 962   gMC->Gsatt("TSA8","SEEN",0);
 963   gMC->Gsatt("TIIN","SEEN",1);
 964   gMC->Gsatt("TIIN","COLO",7);
 965   gMC->Gsatt("TII1","SEEN",0);
 966   gMC->Gsatt("TIFC","SEEN",1);
 967   gMC->Gsatt("TIFC","COLO",4);
 968   gMC->Gsatt("TSA9","SEEN",0);
 969   gMC->Gsatt("TS10","SEEN",0);
 970   gMC->Gsatt("TS11","SEEN",0);
 971   gMC->Gsatt("TS12","SEEN",0);
 972   gMC->Gsatt("TS13","SEEN",0);
 973   gMC->Gsatt("TS14","SEEN",0);
 974   gMC->Gsatt("TICC","SEEN",0);
 975   gMC->Gsatt("TICM","SEEN",0);
 976   gMC->Gsatt("TS15","SEEN",0);
 977   gMC->Gsatt("TS16","SEEN",0);
 978   gMC->Gsatt("TS17","SEEN",0);
 979   gMC->Gsatt("TS18","SEEN",0);
 980   gMC->Gsatt("TS19","SEEN",0);
 981   gMC->Gsatt("TPJ1","SEEN",0);
 982   gMC->Gsatt("TPJ2","SEEN",0);
 983   gMC->Gsatt("TICS","SEEN",0);
 984   gMC->Gsatt("TDGS","SEEN",0);
 985   gMC->Gsatt("TIRC","SEEN",0);
 986   gMC->Gsatt("TIC1","SEEN",1);
 987   gMC->Gsatt("TIPP","SEEN",0);
 988   gMC->Gsatt("TIC3","SEEN",0);
 989   gMC->Gsatt("TRCE","SEEN",0);
 990   gMC->Gsatt("TPSC","SEEN",0);
 991   gMC->Gsatt("TPCC","SEEN",0);
 992   gMC->Gsatt("TORC","SEEN",0);
 993   gMC->Gsatt("TOPP","SEEN",0);
 994   gMC->Gsatt("TOC3","SEEN",0);
 995   gMC->Gsatt("TOC1","SEEN",1);
 996   gMC->Gsatt("TSSW","SEEN",1);
 997   gMC->Gsatt("TSWC","SEEN",1);
 998   gMC->Gsatt("TSSW","COLO",3);
 999   gMC->Gsatt("TSWC","COLO",3);
1000   gMC->Gsatt("TSCE","COLO",6);
1001   gMC->Gsatt("TSCE","SEEN",1);
1002   gMC->Gsatt("TWES","SEEN",0);
1003   gMC->Gsatt("TSWB","SEEN",0);
1004   gMC->Gsatt("TPEL","SEEN",0);
1005   gMC->Gsatt("TPMW","SEEN",1);
1006   gMC->Gsatt("TESR","SEEN",1);
1007   gMC->Gsatt("TPMW","COLO",12);
1008   gMC->Gsatt("TIC1","COLO",5);
1009   gMC->Gsatt("TOC1","COLO",5);
1010   gMC->Gsatt("TESB","SEEN",0);
1011   gMC->Gsatt("THVM","SEEN",1);
1012   gMC->Gsatt("THVM","COLO",11);
1013   gMC->Gsatt("THVH","SEEN",0);
1014   gMC->Gsatt("TPSR","SEEN",0);
1015   gMC->Gsatt("THVL","SEEN",0);
1016   gMC->Gsatt("THVC","SEEN",0);
1017   gMC->Gsatt("THVE","SEEN",0);
1018   gMC->Gsatt("THVR","SEEN",0);
1019
1020   //
1021   gMC->Gdopt("hide", "on");
1022   gMC->Gdopt("shad", "on");
1023   gMC->Gsatt("*", "fill", 7);
1024   gMC->SetClipBox(".");
1025   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1026   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1027   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1028   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1029   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1030   gMC->DefaultRange();
1031   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1032   gMC->Gdhead(1111, "Time Projection Chamber");
1033   gMC->Gdman(18, 4, "MAN");
1034   gMC->Gdopt("hide","off");
1035 }
1036
1037 //_____________________________________________________________________________
1038 void AliTPCv3::CreateMaterials()
1039 {
1040   //
1041   // Define materials for version 2 of the Time Projection Chamber
1042   //
1043
1044
1045   //
1046   AliTPC::CreateMaterials();
1047 }
1048
1049 //_____________________________________________________________________________
1050 void AliTPCv3::Init()
1051 {
1052   //
1053   // Initialises version 3 of the TPC after that it has been built
1054   //
1055   //Int_t *idtmed = fIdtmed->GetArray();
1056
1057   AliTPC::Init();
1058
1059    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
1060
1061   gMC->SetMaxNStep(-30000); // max. number of steps increased
1062
1063   // specific energy loss is now set in galice.cuts
1064
1065   printf("%s: *** TPC version 3 initialized***\n",ClassName());
1066
1067   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1068
1069   // printf("*** TPC version 3 initialized ***\n");
1070   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1071
1072   //
1073
1074 }
1075
1076 //_____________________________________________________________________________
1077 void AliTPCv3::StepManager()
1078 {
1079   //
1080   // Called for every step in the Time Projection Chamber
1081   //
1082
1083   //
1084   // parameters used for the energy loss calculations
1085   //
1086   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1087   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1088   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1089
1090
1091   const Float_t kbig = 1.e10;
1092
1093   Int_t id,copy;
1094   TLorentzVector pos;
1095   Float_t hits[5];
1096   Int_t vol[2];
1097
1098   vol[1]=0;
1099   vol[0]=0;
1100
1101   //
1102
1103   gMC->SetMaxStep(kbig);
1104
1105   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1106
1107   Float_t charge = gMC->TrackCharge();
1108
1109   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1110
1111
1112   id=gMC->CurrentVolID(copy);
1113
1114
1115   if (id != fIdSens) return;
1116
1117   //
1118   //  charged particle is in the sensitive volume
1119   //
1120
1121   if(gMC->TrackStep() > 0) {
1122
1123
1124     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1125     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1126
1127     gMC->TrackPosition(pos);
1128     hits[0]=pos[0];
1129     hits[1]=pos[1];
1130     hits[2]=pos[2];
1131
1132     // Get also the track time for pileup simulation
1133     hits[4]=gMC->TrackTime();
1134
1135     //
1136     // check the selected side of the TPC
1137     //
1138
1139     if(fSide && fSide*hits[2]<=0.) return;
1140
1141     hits[3]=(Float_t)nel;
1142
1143     // Add this hit
1144
1145     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1146
1147   }
1148
1149   // Stemax calculation for the next step
1150
1151   Float_t pp;
1152   TLorentzVector mom;
1153   gMC->TrackMomentum(mom);
1154   Float_t ptot=mom.Rho();
1155   Float_t betaGamma = ptot/gMC->TrackMass();
1156
1157   Int_t pid=gMC->TrackPid();
1158   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1159     {
1160       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1161     }
1162   else
1163     {
1164       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3);
1165       pp=kprim*AliMathBase::BetheBlochAleph(betaGamma);
1166       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1167     }
1168
1169   Double_t rnd = gMC->GetRandom()->Rndm();
1170
1171   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1172
1173 }