TPC/AliTPCv2.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 2 -- detailed TPC and slow simulation    //
  22 //                                                                           //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv2Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 //#include <stdlib.h>
  33
  34 #include <TLorentzVector.h>
  35 #include <TPDGCode.h>
  36 #include <TString.h>
  37 #include "AliLog.h"
  38 #include "AliMathBase.h"
  39 #include "AliTrackReference.h"
  40 #include "AliTPCParam.h"
  41 #include "AliTPCTrackHitsV2.h"
  42 #include "AliTPCv2.h"
  43 #include "AliGeomManager.h"
  44 #include "TGeoVolume.h"
  45 #include "TGeoPcon.h"
  46 #include "TGeoTube.h"
  47 #include "TGeoPgon.h"
  48 #include "TGeoTrd1.h"
  49 #include "TGeoCompositeShape.h"
  50 #include "TGeoPara.h"
  51 #include "TGeoPhysicalNode.h"
  52 #include "TGeoHalfSpace.h"
  53
  54 ClassImp(AliTPCv2)
  55
  56 //_____________________________________________________________________________
  57 AliTPCv2::AliTPCv2(const char *name, const char *title) :
  58   AliTPC(name, title),
  59   fIdSens(0),
  60   fIDrift(0),
  61   fSecOld(0)
  62 {
  63   //
  64   // Standard constructor for Time Projection Chamber version 2
  65   //
  66
  67
  68   SetBufferSize(128000);
  69
  70
  71 //   if (fTPCParam)
  72 //      fTPCParam->Write(fTPCParam->GetTitle());
  73 }
  74
  75 //_____________________________________________________________________________
  76 void AliTPCv2::CreateGeometry()
  77 {
  78   //
  79   // Create the geometry of Time Projection Chamber version 2
  80   //
  81   //Begin_Html
  82   /*
  83     <img src="picts/AliTPC.gif">
  84   */
  85   //End_Html
  86   //Begin_Html
  87   /*
  88     <img src="picts/AliTPCv2Tree.gif">
  89   */
  90   //End_Html
  91
  92   //----------------------------------------------------------
  93   // This geometry is written using TGeo class
  94   // Firstly the shapes are defined, and only then the volumes
  95   // What is recognized by the MC are volumes
  96   //----------------------------------------------------------
  97   //
  98   //  tpc - this will be the mother volume
  99   //
 100
 101   //
 102   // here I define a volume TPC
 103   // retrive the medium name with "TPC_" as a leading string
 104   //
 105   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
 106   //
 107   tpc->DefineSection(0,-291.,77.,278.);
 108   tpc->DefineSection(1,-270,77.,278.);
 109   //
 110   tpc->DefineSection(2,-270.,77.,278.);
 111   tpc->DefineSection(3,-259.6,70.,278.);
 112   //
 113   tpc->DefineSection(4,-259.6,68.1,278.);
 114   tpc->DefineSection(5,-253.6,68.1,278.);
 115   //
 116   tpc->DefineSection(6,-253.6,68.,278.);
 117   tpc->DefineSection(7,-74.0,60.8,278.);
 118   //
 119   tpc->DefineSection(8,-74.0,60.1,278.);
 120   tpc->DefineSection(9,-73.3,60.1,278.);
 121   //
 122   tpc->DefineSection(10,-73.3,56.9,278.);
 123   tpc->DefineSection(11,73.3,56.9,278.);
 124   //
 125   tpc->DefineSection(12,73.3,60.1,278.);
 126   tpc->DefineSection(13,74.0,60.1,278.);
 127   //
 128   tpc->DefineSection(14,74.0,60.8,278.);
 129   tpc->DefineSection(15,253.6,65.5,278.);
 130   //
 131   tpc->DefineSection(16,253.6,65.6,278.);
 132   tpc->DefineSection(17,259.6,65.6,278.);
 133   //
 134   tpc->DefineSection(18,259.6,70.0,278.);
 135   tpc->DefineSection(19,291.,77.,278.);
 136   //
 137   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 138   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 139   //
 140   // drift volume - sensitive volume, extended beyond the
 141   // endcaps, because of the alignment
 142   //
 143   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 144   dvol->DefineSection(0,-260.,74.5,264.4);
 145   dvol->DefineSection(1,-253.6,74.5,264.4);
 146   //
 147   dvol->DefineSection(2,-253.6,76.6774,258.);
 148   dvol->DefineSection(3,253.6,76.6774,258.);
 149   //
 150   dvol->DefineSection(4,253.6,74.5,264.4);
 151   dvol->DefineSection(5,260.,74.5,264.4);
 152   //
 153   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 154   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 155   //
 156   v1->AddNode(v9,1);
 157   //
 158   // outer insulator
 159   //
 160   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 161   //
 162   tpco->DefineSection(0,-256.6,264.8,278.);
 163   tpco->DefineSection(1,-253.6,264.8,278.);
 164   //
 165   tpco->DefineSection(2,-253.6,258.,278.);
 166   tpco->DefineSection(3,250.6,258.,278.);
 167   //
 168   tpco->DefineSection(4,250.6,258.,275.5);
 169   tpco->DefineSection(5,253.6,258.,275.5);
 170   //
 171   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 172   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 173   //
 174   // outer containment vessel
 175   //
 176   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 177   //
 178   tocv->DefineSection(0,-256.6,264.8,278.);
 179   tocv->DefineSection(1,-253.6,264.8,278.);
 180   //
 181   tocv->DefineSection(2,-253.6,274.8124,278.);
 182   tocv->DefineSection(3,247.6,274.8124,278.);
 183   //
 184   tocv->DefineSection(4,247.6,270.4,278.);
 185   tocv->DefineSection(5,250.6,270.4,278.);
 186   //
 187   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 188   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 189   //
 190   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 191   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 192   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 193   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 194   //
 195   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 196   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 197   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 198   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 199   //
 200   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 201   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 202   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 203   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 204  //-------------------------------------------------------
 205   //  Tpc Outer Field Cage
 206   //  daughters - composite (sandwich)
 207   //-------------------------------------------------------
 208
 209   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 210   //
 211   tofc->DefineSection(0,-253.6,258.,269.6);
 212   tofc->DefineSection(1,-250.6,258.,269.6);
 213   //
 214   tofc->DefineSection(2,-250.6,258.,260.0676);
 215   tofc->DefineSection(3,250.6,258.,260.0676);
 216   //
 217   tofc->DefineSection(4,250.6,258.,275.5);
 218   tofc->DefineSection(5,253.6,258.,275.5);
 219   //
 220   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 221   //sandwich
 222   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 223   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 224   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 225   //
 226   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 227   //
 228   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 229   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 230   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 231   //
 232   // outer part - positioning
 233   //
 234   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 235   //
 236   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 237   //
 238   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 239   //
 240   v2->AddNode(v3,1); v2->AddNode(v4,1);
 241   //
 242   v1->AddNode(v2,1);
 243   //--------------------------------------------------------------------
 244   // Tpc Inner INsulator (CO2)
 245   // the cones, the central drum and the inner f.c. sandwich with a piece
 246   // of the flane will be placed in the TPC
 247   //--------------------------------------------------------------------
 248   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 249   //
 250   tpci->DefineSection(0,-253.6,68.4,76.6774);
 251   tpci->DefineSection(1,-74.0,61.2,76.6774);
 252   //
 253   tpci->DefineSection(2,74.0,61.2,76.6774);
 254   //
 255   tpci->DefineSection(3,253.6,65.9,76.6774);
 256   //
 257   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 258   //
 259   // now the inner field cage - only part of flanges (2 copies)
 260   //
 261   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 262   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 263   //
 264  //---------------------------------------------------------
 265   // Tpc Inner Containment vessel - Muon side
 266   //---------------------------------------------------------
 267   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 268   //
 269   tcms->DefineSection(0,-259.1,68.1,74.2);
 270   tcms->DefineSection(1,-253.6,68.1,74.2);
 271   //
 272   tcms->DefineSection(2,-253.6,68.1,68.4);
 273   tcms->DefineSection(3,-74.0,60.9,61.2);
 274   //
 275   tcms->DefineSection(4,-74.0,60.1,61.2);
 276   tcms->DefineSection(5,-73.3,60.1,61.2);
 277   //
 278   tcms->DefineSection(6,-73.3,56.9,61.2);
 279   tcms->DefineSection(7,-73.0,56.9,61.2);
 280   //
 281   tcms->DefineSection(8,-73.0,56.9,58.8);
 282   tcms->DefineSection(9,-71.3,56.9,58.8);
 283   //
 284   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 285   //-----------------------------------------------
 286   // inner containment vessel - shaft side
 287   //-----------------------------------------------
 288   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 289   //
 290   tcss->DefineSection(0,71.3,56.9,58.8);
 291   tcss->DefineSection(1,73.0,56.9,58.8);
 292   //
 293   tcss->DefineSection(2,73.0,56.9,61.2);
 294   tcss->DefineSection(3,73.3,56.9,61.2);
 295   //
 296   tcss->DefineSection(4,73.3,60.1,61.2);
 297   tcss->DefineSection(5,74.0,60.1,61.2);
 298   //
 299   tcss->DefineSection(6,74.0,60.9,61.2);
 300   tcss->DefineSection(7,253.6,65.6,65.9);
 301   //
 302   tcss->DefineSection(8,253.6,65.6,74.2);
 303   tcss->DefineSection(9,258.1,65.6,74.2);
 304   //
 305   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 306   //-----------------------------------------------
 307   //  Inner field cage
 308   //  define 4 parts and make an assembly
 309   //-----------------------------------------------
 310   // part1 - Al - 2 copies
 311   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 312   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 313   // sandwich - outermost parts - 2 copies
 314   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 315   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 316   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 317   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 318   //
 319   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 320   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 321   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 322   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 323   //
 324   // middle parts - 2 copies
 325   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 326   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 327   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 328   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 329   //
 330   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 331   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 332   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 333   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 334   // central part - 1 copy
 335   TGeoTube *t10 = new TGeoTube(76.6774,78.785,93.75); // tedlar 38 microns
 336   TGeoTube *t11 = new TGeoTube(76.6812,78.7812,93.75); // prepreg3 300 microns
 337   TGeoTube *t12 = new TGeoTube(76.7312,78.7312,93.75); // nomex 2 cm
 338   //
 339   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 340   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 341   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 342   //
 343   // inner part - positioning
 344   //
 345   // creating a sandwich
 346   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 347   //
 348   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 349   //
 350   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 351   //
 352   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 353   //
 354   tv100->AddNode(tv10,1);
 355   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 356   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 357   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 358   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 359   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 360   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 361   //
 362   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 363   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 364   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 365   v9->AddNode(tv100,1);
 366   //
 367   // central drum
 368   //
 369   // flange + sandwich
 370   //
 371   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 372   cfl->DefineSection(0,-71.1,59.7,61.2);
 373   cfl->DefineSection(1,-68.6,59.7,61.2);
 374   //
 375   cfl->DefineSection(2,-68.6,60.6124,61.2);
 376   cfl->DefineSection(3,68.6,60.6124,61.2);
 377   //
 378   cfl->DefineSection(4,68.6,59.7,61.2);
 379   cfl->DefineSection(5,71.1,59.7,61.2);
 380   //
 381   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 382   // sandwich
 383   TGeoTube *cd1 = new TGeoTube(60.6224,61.19,71.1);
 384   TGeoTube *cd2 = new TGeoTube(60.6262,61.1862,71.1);
 385   TGeoTube *cd3 = new TGeoTube(60.6462,61.1662,71.1);
 386   TGeoTube *cd4 = new TGeoTube(60.6562,61.1562,71.1);
 387   //
 388   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 389   TGeoMedium *sm8 = gGeoManager->GetMedium("TPC_Epoxyfm");
 390   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 391   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 392   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm8); //epoxy film
 393   TGeoVolume *cd4v = new TGeoVolume("TPC_CDR4",cd4,sm4); //nomex
 394
 395   //
 396   // seals for central drum 2 copies
 397   //
 398   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 399   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 400   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 401   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
 402   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
 403   //
 404   // seal collars
 405   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 406   se->DefineSection(0,-72.8,59.7,61.2);
 407   se->DefineSection(1,-72.3,59.7,61.2);
 408   //
 409   se->DefineSection(2,-72.3,58.85,61.2);
 410   se->DefineSection(3,-71.6,58.85,61.2);
 411   //
 412   se->DefineSection(4,-71.6,59.7,61.2);
 413   se->DefineSection(5,-71.3,59.7,61.2);
 414   //
 415   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 416   //
 417   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 418   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 419   //
 420   // define reflection matrix
 421   //
 422   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 423   //
 424   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cd3v->AddNode(cd4v,1); cflv->AddNode(cd1v,1);
 425   //
 426   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 427   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 428   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 429   //
 430   // central membrane - 2 rings and a mylar membrane - assembly
 431   //
 432   TGeoTube *ih = new TGeoTube(80.1,84.1,0.2);
 433   TGeoTube *oh = new TGeoTube(250.25,256.75,0.2);
 434   TGeoTube *mem = new TGeoTube(84.1,250.25,0.01);
 435   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 436   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 437   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 438   //
 439   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 440   cm->AddNode(ihv,1);
 441   cm->AddNode(ohv,1);
 442   cm->AddNode(memv,1);
 443   v9->AddNode(cm,1);
 444   //
 445   // end caps - they are make as an assembly of single segments
 446   // containing both readout chambers
 447   //
 448   Double_t openingAngle = 10.*TMath::DegToRad();
 449   Double_t thick=1.5; // rib
 450   Double_t shift = thick/TMath::Sin(openingAngle);
 451   //
 452   Double_t lowEdge = 86.3; // hole in the wheel
 453   Double_t upEdge = 240.4; // hole in the wheel
 454   //
 455   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 456   //
 457   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 458   //
 459   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 460   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 461   //
 462   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 463   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 464   //
 465   Double_t ys = shift*TMath::Sin(openingAngle);
 466   Double_t xs = shift*TMath::Cos(openingAngle);
 467   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 468   tr->RegisterYourself();
 469   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 470   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 471   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 472   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 473   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 474   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 475   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 476   //
 477   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 478   //
 479   // readout chambers
 480   //
 481   // IROC first
 482   //
 483    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 484    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 485   // empty space
 486    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 487    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 488    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 489    //bars
 490    Double_t tga = (19.8328-12.3742)/39.3;
 491    Double_t xmin,xmax;
 492    xmin = 9.55*tga+12.3742;
 493    xmax = 9.95*tga+12.3742;
 494    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 495    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 496    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 497    xmin=19.4*tga+12.3742;
 498    xmax=19.9*tga+12.3742;
 499    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 500    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 501    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 502    xmin=29.35*tga+12.3742;
 503    xmax=29.75*tga+12.3742;
 504    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 505    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 506    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 507    //
 508    // holes for connectors
 509    //
 510    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 511    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 512    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 513    fileName += "/TPC/conn_iroc.dat";
 514    ifstream in;
 515    in.open(fileName.Data(), ios_base::in); // asci file
 516    TGeoRotation *rrr[86];
 517    for(Int_t i =0;i<86;i++){
 518       Double_t y = 3.99;
 519       Double_t x,z,ang;
 520       in>>x>>z>>ang;
 521       z-=26.5;
 522       rrr[i]= new TGeoRotation();
 523       rrr[i]->RotateY(ang);
 524       ibdv->AddNode(connv,i+1,new TGeoCombiTrans(x,y,z,rrr[i]));
 525    }
 526    in.close();
 527    // "cap"
 528    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 529    // "hole"
 530    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 531    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 532    tr1->RegisterYourself();
 533    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 534    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 535    //
 536    // pad plane and wire fixations
 537    //
 538    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 539    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 540    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 541    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 542    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 543    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 544    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 545    //
 546    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 547    //
 548    iroc->AddNode(ibdv,1);
 549    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 550    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 551    tga =(23.3521-14.5974)/49.65;
 552    Double_t xx = 24.825*tga+14.5974-0.6;
 553    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 554    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 555    //
 556    // OROC
 557    //
 558    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 559    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 560    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 561    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 562    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 563    //horizontal bars
 564    tga=(38.5084-20.2938)/99.3;
 565    xmin=tga*10.2+20.2938;
 566    xmax=tga*10.6+20.2938;
 567    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 568    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 569    //
 570    xmin=22.55*tga+20.2938;
 571    xmax=24.15*tga+20.2938;
 572    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 573    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 574    //
 575    xmin=36.1*tga+20.2938;
 576    xmax=36.5*tga+20.2938;
 577    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 578    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 579    //
 580    xmin=49.0*tga+20.2938;
 581    xmax=50.6*tga+20.2938;
 582    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 583    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 584    //
 585    xmin=63.6*tga+20.2938;
 586    xmax=64.0*tga+20.2938;
 587    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 588    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 589    //
 590    xmin=75.5*tga+20.2938;
 591    xmax=77.15*tga+20.2938;
 592    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 593    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 594    //
 595    xmin=88.7*tga+20.2938;
 596    xmax=89.1*tga+20.2938;
 597    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 598    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 599    //
 600    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 601    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 602    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 603    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 604    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 605    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 606    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 607    // vertical bars
 608    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 609    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 610    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 611    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 612    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 613    //
 614    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 615    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 616    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 617    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 618    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 619    //
 620    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 621    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 622    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 623    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 624    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 625    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 626    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 627    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 628    //
 629    // holes for connectors
 630    //
 631    fileName = gSystem->Getenv("ALICE_ROOT");
 632    fileName += "/TPC/conn_oroc.dat";
 633    in.open(fileName.Data(), ios_base::in); // asci file
 634    TGeoRotation *rr[78];
 635    for(Int_t i =0;i<78;i++){
 636       Double_t y =3.89;
 637       Double_t x,z,ang;
 638       Double_t x1,z1,x2,z2;
 639       in>>x>>z>>ang;
 640       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 641       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 642       //
 643       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 644       //
 645       rr[i]= new TGeoRotation();
 646       rr[i]->RotateY(ang);
 647       z1-=54.95;
 648       z2-=54.95;
 649       //
 650       obdv->AddNode(connv,i+1,new TGeoCombiTrans(x1,y,z1,rr[i]));
 651       obdv->AddNode(connv,i+79,new TGeoCombiTrans(x2,y,z2,rr[i]));
 652    }
 653    in.close();
 654    // cap
 655    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 656    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 657    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 658    tr5->RegisterYourself();
 659    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 660    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 661    //
 662    // pad plane and wire fixations
 663    //
 664    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 665    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 666    //
 667    tga=(43.5239-23.3874)/114.2;
 668    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 669    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 670    xx = 57.1*tga+23.3874-0.7;
 671    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 672    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 673    //
 674    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 675    //
 676    oroc->AddNode(obdv,1);
 677    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 678    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 679    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 680    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 681    //
 682    // now iroc and oroc are placed into a sector...
 683    //
 684    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 685    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 686    TGeoRotation rot1("rot1",90.,90.,0.);
 687    TGeoRotation rot2("rot2");
 688    rot2.RotateY(10.);
 689    TGeoRotation *rot = new TGeoRotation("rot");
 690    *rot=rot1*rot2;
 691    //
 692    Double_t x0,y0;
 693    x0=110.2*TMath::Cos(openingAngle);
 694    y0=110.2*TMath::Sin(openingAngle);
 695    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 696    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 697    x0=188.45*TMath::Cos(openingAngle);
 698    y0=188.45*TMath::Sin(openingAngle);
 699    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 700    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 701    //
 702    //
 703    // A-side
 704    //
 705    secta->AddNode(ch,1);
 706    secta->AddNode(iroc,1,combi1a);
 707    secta->AddNode(oroc,1,combi2a);
 708    //
 709    // C-side
 710    //
 711    sectc->AddNode(ch,1);
 712    sectc->AddNode(iroc,1,combi1c);
 713    sectc->AddNode(oroc,1,combi2c);
 714    //
 715    // now I try to make  wheels...
 716    //
 717    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 718    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 719    //
 720    TGeoRotation *rwh[18];
 721    for(Int_t i =0;i<18;i++){
 722      Double_t phi = (20.*i);
 723      rwh[i]=new TGeoRotation();
 724      rwh[i]->RotateZ(phi);
 725      wheela->AddNode(secta,i+1,rwh[i]);
 726      wheelc->AddNode(sectc,i+1,rwh[i]);
 727
 728    }
 729    // wheels in the drift volume!
 730
 731    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 732    v9->AddNode(wheela,1,combi3);
 733    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 734    //_____________________________________________________________
 735    // service support wheel
 736    //_____________________________________________________________
 737   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 738   sw->DefineSection(0,-4.,80.5,251.75);
 739   sw->DefineSection(1,4.,80.5,251.75);
 740   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 741   //
 742   thick=1.;
 743   shift = thick/TMath::Sin(openingAngle);
 744   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 745   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 746   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 747   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 748   //
 749   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 750   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 751   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 752   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 753   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 754   //
 755   shv->AddNode(elv,1);
 756   //
 757   //
 758   ys = shift*TMath::Sin(openingAngle);
 759   xs = shift*TMath::Cos(openingAngle);
 760   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 761   // cover
 762   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 763   co->DefineSection(0,-0.5,77.,255.25);
 764   co->DefineSection(1,0.5,77.,255.25);
 765   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 766   // hole in a cover
 767   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 768   shift=4./TMath::Sin(openingAngle);
 769   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 770   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 771   //
 772   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 773   //
 774   ys = shift*TMath::Sin(openingAngle);
 775   xs = shift*TMath::Cos(openingAngle);
 776   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 777   //
 778   // Sector as an Assembly
 779   //
 780   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 781   swhs->AddNode(swv,1);
 782   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 783   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 784   //
 785   // SSW as an Assembly of sectors
 786   //
 787   TGeoRotation *rsw[18];
 788   TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 789    for(Int_t i =0;i<18;i++){
 790      Double_t phi = (20.*i);
 791      rsw[i] = new TGeoRotation();
 792      rsw[i]->RotateZ(phi);
 793      swheel->AddNode(swhs,i+1,rsw[i]);
 794    }
 795    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 796    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 797
 798    // sensitive strips - strip "0" is always set
 799    // conditional
 800    Int_t totrows;
 801    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 802    Double_t *upar;
 803    upar=NULL;
 804    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 805    upar=new Double_t [10];
 806    upar[0]=0.;
 807    upar[1]=360.;
 808    upar[2]=18.;
 809    upar[3]=2.;
 810    //
 811    upar[4]=-124.8;
 812    upar[7]=124.8;
 813
 814    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 815
 816    upar[5]=rlow;
 817    upar[6]=rlow+.01;
 818    upar[8]=upar[5];
 819    upar[9]=upar[6];
 820    //
 821    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 822    gGeoManager->Node("TPC_Strip",totrows+1,
 823                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 824    //
 825    // now, strips optionally
 826    //
 827    if(fSens){
 828      //lower sectors
 829      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 830        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 831        upar[5]=rlow;
 832        upar[6]=rlow+.01;
 833        upar[8]=upar[5];
 834        upar[9]=upar[6];
 835        gGeoManager->Node("TPC_Strip",i,
 836                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 837        gGeoManager->Node("TPC_Strip",totrows+i,
 838                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 839      }
 840      //upper sectors
 841      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 842        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 843        upar[5]=rlow;
 844        upar[6]=rlow+.01;
 845        upar[8]=upar[5];
 846        upar[9]=upar[6];
 847        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 848                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 849        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 850                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 851      }
 852    }//strips
 853   //----------------------------------------------------------
 854   // TPC Support Rods - MAKROLON
 855   //----------------------------------------------------------
 856   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 857   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 858   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
 859   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
 860   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
 861   TGeoMedium *m13 = gGeoManager->GetMedium("TPC_Brass");
 862   //
 863   // tpc rod is an assembly of 10 long parts and 2 short parts
 864   // connected with alu rings and plagged on both sides.
 865   //
 866   //
 867 // tpc rod long
 868 //
 869   TGeoPcon *rod = new TGeoPcon("rod",0.,360.,6);
 870  rod->DefineSection(0,-10.43,1.92,2.08);
 871  rod->DefineSection(1,-9.75,1.92,2.08);
 872
 873  rod->DefineSection(2,-9.75,1.8,2.2);
 874  rod->DefineSection(3,9.75,1.8,2.2);
 875
 876  rod->DefineSection(4,9.75,1.92,2.08);
 877  rod->DefineSection(5,10.43,1.92,2.08);
 878  //
 879  TGeoVolume *mrodl = new TGeoVolume("TPC_mrodl",rod,m6);
 880  //
 881  // tpc rod short
 882  //
 883  TGeoPcon *rod1 = new TGeoPcon("rod1",0.,360.,6);
 884  rod1->DefineSection(0,-8.93,1.92,2.08);
 885  rod1->DefineSection(1,-8.25,1.92,2.08);
 886
 887  rod1->DefineSection(2,-8.25,1.8,2.2);
 888  rod1->DefineSection(3,8.25,1.8,2.2);
 889
 890  rod1->DefineSection(4,8.25,1.92,2.08);
 891  rod1->DefineSection(5,8.93,1.92,2.08);
 892  //
 893  TGeoVolume *mrods = new TGeoVolume("TPC_mrods",rod1,m6);
 894  //
 895  // below is for the resistor rod
 896  //
 897  // hole for the brass connectors
 898  //
 899
 900  new TGeoTube("hhole",0.,0.3,0.3);
 901  //
 902  //transformations for holes - initialy they
 903  // are placed at x=0 and negative y
 904  //
 905   TGeoRotation *rhole = new TGeoRotation();
 906   rhole->RotateX(90.);
 907   TGeoCombiTrans *transf[13];
 908   Char_t name[30];
 909   for(Int_t i=0;i<13;i++){
 910     sprintf(name,"transf%d",i);
 911     transf[i]= new TGeoCombiTrans(name,0.,-2.,-9.+i*1.5,rhole);
 912     transf[i]->RegisterYourself();
 913   }
 914   // union expression for holes
 915   TString operl("hhole:transf0");
 916   for (Int_t i=1;i<13;i++){
 917     sprintf(name,"+hhole:transf%d",i);
 918     operl.Append(name);
 919   }
 920   //
 921  TString opers("hhole:transf1");
 922   for (Int_t i=2;i<12;i++){
 923     sprintf(name,"+hhole:transf%d",i);
 924     opers.Append(name);
 925   }
 926   //union of holes
 927   new TGeoCompositeShape("hlv",operl.Data());
 928   new TGeoCompositeShape("hsv",opers.Data());
 929   //
 930   TGeoCompositeShape *rodl = new TGeoCompositeShape("rodl","rod-hlv");
 931   TGeoCompositeShape *rods = new TGeoCompositeShape("rods","rod1-hsv");
 932  //rods - volumes - makrolon rods with holes
 933   TGeoVolume *rodlv = new TGeoVolume("TPC_rodl",rodl,m6);
 934   TGeoVolume *rodsv = new TGeoVolume("TPC_rods",rods,m6);
 935   //brass connectors
 936  //connectors
 937   TGeoTube *bcon = new TGeoTube(0.,0.3,0.3);//connectors
 938   TGeoVolume *bconv = new TGeoVolume("TPC_bcon",bcon,m13);
 939  //
 940  // hooks holding strips
 941  //
 942  new TGeoBBox("hk1",0.625,0.015,0.75);
 943  new TGeoBBox("hk2",0.625,0.015,0.15);
 944  TGeoTranslation *tr21 = new TGeoTranslation("tr21",0.,-0.03,-0.6);
 945  TGeoTranslation *tr12 = new TGeoTranslation("tr12",0.,-0.03,0.6);
 946  tr21->RegisterYourself();
 947  tr12->RegisterYourself();
 948
 949  TGeoCompositeShape *hook = new TGeoCompositeShape("hook","hk1+hk2:tr21+hk2:tr12");
 950  TGeoVolume *hookv = new TGeoVolume("TPC_hook",hook,m13);
 951  //
 952  // assembly of the short rod with connectors and hooks
 953  //
 954  //
 955  // short rod
 956  //
 957   TGeoVolumeAssembly *spart = new TGeoVolumeAssembly("TPC_spart");
 958   //
 959   spart->AddNode( rodsv,1);
 960   for(Int_t i=1;i<12;i++){
 961   spart->AddNode(bconv,i,transf[i]);
 962   }
 963   for(Int_t i =0;i<11;i++){
 964     spart->AddNode(hookv,i+1,new TGeoTranslation(0.,-2.315,-7.5+i*1.5));
 965   }
 966  //
 967  // long rod
 968  //
 969   TGeoVolumeAssembly *lpart = new TGeoVolumeAssembly("TPC_lpart");
 970   //
 971   lpart->AddNode( rodlv,1);
 972   for(Int_t i=0;i<13;i++){
 973   lpart->AddNode(bconv,i+12,transf[i]);
 974   }
 975   for(Int_t i =0;i<13;i++){
 976     lpart->AddNode(hookv,i+12,new TGeoTranslation(0.,-2.315,-9.+i*1.5));
 977   }
 978   //
 979   // alu ring
 980   //
 981   new TGeoTube("ring1",2.1075,2.235,0.53);
 982   new TGeoTube("ring2",1.7925,1.89,0.43);
 983   new TGeoTube("ring3",1.89,2.1075,0.05);
 984   TGeoCompositeShape *ring = new TGeoCompositeShape("ring","ring1+ring2+ring3");
 985   TGeoVolume *ringv = new TGeoVolume("TPC_ring",ring,m3);
 986   //
 987   // rod assembly
 988   //
 989   TGeoVolumeAssembly *tpcrrod = new TGeoVolumeAssembly("TPC_rrod");//rrod
 990   TGeoVolumeAssembly *tpcmrod = new TGeoVolumeAssembly("TPC_mrod");//makrolon rod
 991   //long pieces
 992   for(Int_t i=0;i<11;i++){
 993     tpcrrod->AddNode(ringv,i+1,new TGeoTranslation(0.,0.,-105.+i*21));
 994     tpcmrod->AddNode(ringv,i+12,new TGeoTranslation(0.,0.,-105.+i*21));
 995   }
 996   for(Int_t i=0;i<10;i++){
 997     tpcrrod->AddNode(lpart,i+1,new TGeoTranslation(0.,0.,-94.5+i*21));
 998     tpcmrod->AddNode(mrodl,i+1,new TGeoTranslation(0.,0.,-94.5+i*21));
 999   }
1000   //
1001   // short pieces
1002   //
1003   tpcrrod->AddNode(spart,1,new TGeoTranslation(0.,0.,-114.));
1004   tpcrrod->AddNode(spart,2,new TGeoTranslation(0.,0.,114.));
1005   tpcrrod->AddNode(ringv,23,new TGeoTranslation(0.,0.,-123.));
1006   tpcrrod->AddNode(ringv,24,new TGeoTranslation(0.,0.,123.));
1007   //
1008   tpcmrod->AddNode(mrods,1,new TGeoTranslation(0.,0.,-114.));
1009   tpcmrod->AddNode(mrods,2,new TGeoTranslation(0.,0.,114.));
1010   tpcmrod->AddNode(ringv,25,new TGeoTranslation(0.,0.,-123.));
1011   tpcmrod->AddNode(ringv,26,new TGeoTranslation(0.,0.,123.));
1012  //
1013   // left plaque
1014   //
1015   TGeoPcon *lp = new TGeoPcon(0.,360.,4);
1016   //
1017   lp->DefineSection(0,-125.8,1.92,2.235);
1018   lp->DefineSection(1,-124.8,1.92,2.235);
1019   //
1020   lp->DefineSection(2,-124.8,1.92,2.08);
1021   lp->DefineSection(3,-123.1,1.92,2.08);
1022   //
1023   TGeoVolume *lpv1 = new TGeoVolume("TPC_lpv1",lp,m6);
1024   TGeoVolume *lpv2 = new TGeoVolume("TPC_lpv2",lp,m6);
1025   // left ring
1026   TGeoTube *lr = new TGeoTube(2.1075,2.235,0.5);
1027   TGeoVolume *lrv = new TGeoVolume("TPC_lrv",lr,m3);
1028   //
1029   lpv2->AddNode(lrv,1,new TGeoTranslation(0.,0.,-125.3));
1030   //
1031   tpcrrod->AddNode(lpv2,1);
1032   tpcmrod->AddNode(lpv1,1);
1033   //
1034   //  right plaque
1035   //
1036   TGeoTube *rp = new TGeoTube(1.92,2.08,1.125);
1037   TGeoVolume *rpv = new TGeoVolume("TPC_rpv",rp,m6);
1038   tpcrrod->AddNode(rpv,1, new TGeoTranslation(0.,0.,125.35));
1039   tpcmrod->AddNode(rpv,2,new TGeoTranslation(0.,0.,125.35));
1040   //
1041   //
1042   //HV rods - makrolon + 0.58cm (diameter) Cu
1043   TGeoTube *hvr = new TGeoTube(0.,1.465,126.7);
1044   TGeoTube *hvc = new TGeoTube(0.,0.29,126.7);
1045   //
1046   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
1047   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
1048   hvrv->AddNode(hvcv,1);
1049   //
1050   //resistor rod
1051   //
1052   TGeoTube *cr = new TGeoTube(0.,0.45,126.2);
1053   TGeoTube *cw = new TGeoTube(0.,0.15,126.2);
1054   TGeoVolume *crv = new TGeoVolume("TPC_CR",cr,m10);
1055   TGeoVolume *cwv = new TGeoVolume("TPC_W",cw,m12);
1056   //
1057   // ceramic rod with water
1058   //
1059   crv->AddNode(cwv,1);
1060   //
1061   //peek rod
1062   //
1063   TGeoTube *pr =new TGeoTube(0.2,0.35,126.2);
1064   TGeoVolume *prv = new TGeoVolume("TPC_PR",pr,m11);
1065   //
1066   // copper plates with connectors
1067   //
1068   new TGeoTube("tub",0.,1.7,0.025);
1069   //
1070   // half space - points on the plane and a normal vector
1071   //
1072   Double_t n[3],p[3];
1073   Double_t slope = TMath::Tan(22.*TMath::DegToRad());
1074   Double_t intp = 1.245;
1075   //
1076   Double_t b = slope*slope+1.;
1077   p[0]=intp*slope/b;
1078   p[1]=-intp/b;
1079   p[2]=0.;
1080   //
1081   n[0]=-p[0];
1082   n[1]=-p[1];
1083   n[2]=0.;
1084   Double_t norm;
1085   norm=TMath::Sqrt(n[0]*n[0]+n[1]*n[1]);
1086   n[0] /= norm;
1087   n[1] /=norm;
1088   //
1089   new TGeoHalfSpace("sp1",p,n);
1090   //
1091   slope = -slope;
1092   //
1093   p[0]=intp*slope/b;
1094   p[1]=-intp/b;
1095   //
1096   n[0]=-p[0];
1097   n[1]=-p[1];
1098   norm=TMath::Sqrt(n[0]*n[0]+n[1]*n[1]);
1099   n[0] /= norm;
1100   n[1] /=norm;
1101   //
1102   new TGeoHalfSpace("sp2",p,n);
1103   // holes for rods
1104  //holes
1105  new TGeoTube("h1",0.,0.5,0.025);
1106  new TGeoTube("h2",0.,0.35,0.025);
1107  //translations:
1108  TGeoTranslation *ttr11 = new TGeoTranslation("ttr11",-0.866,0.5,0.);
1109  TGeoTranslation *ttr22 = new TGeoTranslation("ttr22",0.866,0.5,0.);
1110  ttr11->RegisterYourself();
1111  ttr22->RegisterYourself();
1112  // elastic connector
1113  new TGeoBBox("elcon",0.72,0.005,0.3);
1114  TGeoRotation *crr1 = new TGeoRotation();
1115  crr1->RotateZ(-22.);
1116 TGeoCombiTrans *ctr1 = new TGeoCombiTrans("ctr1",-0.36011, -1.09951,-0.325,crr1);
1117 ctr1->RegisterYourself();
1118  TGeoCompositeShape *cs1 = new TGeoCompositeShape("cs1",
1119 "(((((tub-h1:ttr11)-h1:ttr22)-sp1)-sp2)-h2)+elcon:ctr1");
1120  //
1121  TGeoVolume *csvv = new TGeoVolume("TPC_RR_CU",cs1,m7);
1122  //
1123  // resistor rod assembly 2 ceramic rods, peak rod, Cu plates
1124  // and resistors
1125  //
1126  TGeoVolumeAssembly *rrod = new TGeoVolumeAssembly("TPC_RRIN");
1127  // rods
1128  rrod->AddNode(crv,1,ttr11);
1129  rrod->AddNode(crv,2,ttr22);
1130  rrod->AddNode(prv,1);
1131  //Cu plates
1132  for(Int_t i=0;i<165;i++){
1133    rrod->AddNode(csvv,i+1,new TGeoTranslation(0.,0.,-122.675+i*1.5));
1134  }
1135  //resistors
1136  TGeoTube *res = new TGeoTube(0.,0.15,0.5);
1137  TGeoVolume *resv = new TGeoVolume("TPC_RES",res,m10);
1138  TGeoVolumeAssembly *ress = new TGeoVolumeAssembly("TPC_RES_CH");
1139  ress->AddNode(resv,1,new TGeoTranslation(0.2,0.,0.));
1140  ress->AddNode(resv,2,new TGeoTranslation(-0.2,0.,0.));
1141  //
1142  TGeoRotation *crr2 = new TGeoRotation();
1143  crr2->RotateY(30.);
1144  TGeoRotation *crr3 = new TGeoRotation();
1145  crr3->RotateY(-30.);
1146  //
1147  for(Int_t i=0;i<164;i+=2){
1148    rrod->AddNode(ress,i+1, new TGeoCombiTrans(0.,1.2,-121.925+i*1.5,crr2));
1149    rrod->AddNode(ress,i+2, new TGeoCombiTrans(0.,1.2,-121.925+(i+1)*1.5,crr3));
1150  }
1151
1152  tpcrrod->AddNode(rrod,1,new TGeoCombiTrans(0.,0.,0.5,crr1));
1153
1154  //------------------------------------------------------------------
1155  TGeoRotation refl("refl",90.,0.,90.,90.,180.,0.);
1156  TGeoRotation rotrod("rotrod");
1157  //
1158  TGeoRotation *rotpos[2];
1159  //
1160  TGeoRotation *rotrod1[2];
1161
1162  //v9 - drift gas
1163
1164   for(Int_t i=0;i<18;i++){
1165     Double_t angle,x,y;
1166     Double_t z,r;
1167     angle=TMath::DegToRad()*20.*(Double_t)i;
1168     //inner rods
1169     r=81.5;
1170     x=r * TMath::Cos(angle);
1171     y=r * TMath::Sin(angle);
1172     z = 126.;
1173     //
1174     if(i==11){//resistor rod inner
1175        rotrod.RotateZ(-90.+angle);
1176        rotrod1[0]= new TGeoRotation();
1177        rotpos[0]= new TGeoRotation();
1178        //
1179        rotrod1[0]->RotateZ(-90.+angle);
1180        *rotpos[0] = refl*rotrod; //rotation+reflection
1181         v9->AddNode(tpcrrod,1,new TGeoCombiTrans(x,y, z, rotrod1[0])); //A
1182         v9->AddNode(tpcrrod,2,new TGeoCombiTrans(x,y,-z, rotpos[0])); //C
1183     }
1184     else {
1185       v9->AddNode(tpcmrod,i+1,new TGeoTranslation(x,y,z));//shaft
1186       v9->AddNode(tpcmrod,i+19,new TGeoCombiTrans(x,y,-z,ref));//muon
1187     }
1188     // outer rods
1189     r=254.25;
1190     x=r * TMath::Cos(angle);
1191     y=r * TMath::Sin(angle);
1192     z=126.;
1193     //
1194     if(i==3){//resistor rod outer
1195       rotrod.RotateZ(90.+angle);
1196       rotrod1[1]= new TGeoRotation();
1197       rotpos[1]= new TGeoRotation();
1198       rotrod1[1]->RotateZ(90.+angle);
1199       *rotpos[1] = refl*rotrod;//rotation+reflection
1200       v9->AddNode(tpcrrod,3,new TGeoCombiTrans(x,y, z, rotrod1[1])); //A
1201       v9->AddNode(tpcrrod,4,new TGeoCombiTrans(x,y, -z, rotpos[1])); //C
1202     }
1203     else {
1204       v9->AddNode(tpcmrod,i+37,new TGeoTranslation(x,y,z));//shaft
1205       v9->AddNode(tpcmrod,i+55,new TGeoCombiTrans(x,y,-z,ref));//muon
1206     }
1207     if(i==15){
1208       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z)); //hv->A-side only
1209     }
1210   } //end of rods positioning
1211
1212   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
1213   alice->AddNode(v1,1);
1214
1215 } // end of function
1216
1217 //_____________________________________________________________________________
1218 void AliTPCv2::AddAlignableVolumes() const
1219 {
1220   //
1221   // Create entries for alignable volumes associating the symbolic volume
1222   // name with the corresponding volume path. Needs to be syncronized with
1223   // eventual changes in the geometry.
1224   //
1225   SetInnerChambersAlignable();
1226   SetOuterChambersAlignable();
1227 }
1228
1229 //_____________________________________________________________________________
1230 void AliTPCv2::SetInnerChambersAlignable() const
1231 {
1232   //
1233   AliGeomManager::ELayerID idTPC1 = AliGeomManager::kTPC1;
1234   Int_t modUID, modnum = 0;
1235   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
1236   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
1237   TString vpappend = "/TPC_IROC_1";
1238   TString snstr1="TPC/EndcapA/Sector";
1239   TString snstr2="TPC/EndcapC/Sector";
1240   TString snappend="/InnerChamber";
1241   TString volpath, symname;
1242
1243   for(Int_t cnt=1; cnt<=18; cnt++){
1244     modUID = AliGeomManager::LayerToVolUID(idTPC1,modnum++);
1245     volpath = vpstr1;
1246     volpath += cnt;
1247     volpath += vpappend;
1248     symname = snstr1;
1249     symname += cnt;
1250     symname += snappend;
1251     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1252       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1253     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1254     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1255     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,cnt-1);
1256     alignableEntry->SetMatrix(matTtoL);
1257   }
1258
1259   for(Int_t cnt=1; cnt<=18; cnt++){
1260     modUID = AliGeomManager::LayerToVolUID(idTPC1,modnum++);
1261     volpath = vpstr2;
1262     volpath += cnt;
1263     volpath += vpappend;
1264     symname = snstr2;
1265     symname += cnt;
1266     symname += snappend;
1267     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1268       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1269     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1270     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1271     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,18+cnt-1);
1272     alignableEntry->SetMatrix(matTtoL);
1273   }
1274 }
1275
1276 //_____________________________________________________________________________
1277 void AliTPCv2::SetOuterChambersAlignable() const
1278 {
1279   //
1280   AliGeomManager::ELayerID idTPC2 = AliGeomManager::kTPC2;
1281   Int_t modUID, modnum = 0;
1282   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
1283   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
1284   TString vpappend = "/TPC_OROC_1";
1285   TString snstr1="TPC/EndcapA/Sector";
1286   TString snstr2="TPC/EndcapC/Sector";
1287   TString snappend="/OuterChamber";
1288   TString volpath, symname;
1289
1290   for(Int_t cnt=1; cnt<=18; cnt++){
1291     modUID = AliGeomManager::LayerToVolUID(idTPC2,modnum++);
1292     volpath = vpstr1;
1293     volpath += cnt;
1294     volpath += vpappend;
1295     symname = snstr1;
1296     symname += cnt;
1297     symname += snappend;
1298     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1299       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1300     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1301     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1302     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+cnt-1);
1303     alignableEntry->SetMatrix(matTtoL);
1304   }
1305
1306   for(Int_t cnt=1; cnt<=18; cnt++){
1307     modUID = AliGeomManager::LayerToVolUID(idTPC2,modnum++);
1308     volpath = vpstr2;
1309     volpath += cnt;
1310     volpath += vpappend;
1311     symname = snstr2;
1312     symname += cnt;
1313     symname += snappend;
1314     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1315       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1316     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1317     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1318     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+18+cnt-1);
1319     alignableEntry->SetMatrix(matTtoL);
1320   }
1321 }
1322
1323 //_____________________________________________________________________________
1324 void AliTPCv2::DrawDetector() const
1325 {
1326   //
1327   // Draw a shaded view of the Time Projection Chamber version 1
1328   //
1329
1330   // Set everything unseen
1331   gMC->Gsatt("*", "seen", -1);
1332   //
1333   // Set ALIC mother transparent
1334   gMC->Gsatt("ALIC","SEEN",0);
1335   //
1336   // Set the volumes visible
1337   //
1338
1339   gMC->Gsatt("TPC ","SEEN",0);
1340   gMC->Gsatt("TOIN","SEEN",1);
1341   gMC->Gsatt("TOIN","COLO",7);
1342   gMC->Gsatt("TOCV","SEEN",1);
1343   gMC->Gsatt("TOCV","COLO",4);
1344   gMC->Gsatt("TSA1","SEEN",0);
1345   gMC->Gsatt("TSA2","SEEN",0);
1346   gMC->Gsatt("TSA3","SEEN",0);
1347   gMC->Gsatt("TSA4","SEEN",0);
1348   gMC->Gsatt("TSA5","SEEN",0);
1349   gMC->Gsatt("TOFC","SEEN",1);
1350   gMC->Gsatt("TOFC","COLO",4);
1351   gMC->Gsatt("TSA6","SEEN",0);
1352   gMC->Gsatt("TSA7","SEEN",0);
1353   gMC->Gsatt("TSA8","SEEN",0);
1354   gMC->Gsatt("TIIN","SEEN",1);
1355   gMC->Gsatt("TIIN","COLO",7);
1356   gMC->Gsatt("TII1","SEEN",0);
1357   gMC->Gsatt("TIFC","SEEN",1);
1358   gMC->Gsatt("TIFC","COLO",4);
1359   gMC->Gsatt("TSA9","SEEN",0);
1360   gMC->Gsatt("TS10","SEEN",0);
1361   gMC->Gsatt("TS11","SEEN",0);
1362   gMC->Gsatt("TS12","SEEN",0);
1363   gMC->Gsatt("TS13","SEEN",0);
1364   gMC->Gsatt("TS14","SEEN",0);
1365   gMC->Gsatt("TICC","SEEN",0);
1366   gMC->Gsatt("TICM","SEEN",0);
1367   gMC->Gsatt("TS15","SEEN",0);
1368   gMC->Gsatt("TS16","SEEN",0);
1369   gMC->Gsatt("TS17","SEEN",0);
1370   gMC->Gsatt("TS18","SEEN",0);
1371   gMC->Gsatt("TS19","SEEN",0);
1372   gMC->Gsatt("TPJ1","SEEN",0);
1373   gMC->Gsatt("TPJ2","SEEN",0);
1374   gMC->Gsatt("TICS","SEEN",0);
1375   gMC->Gsatt("TDGN","SEEN",0);
1376   gMC->Gsatt("TIRC","SEEN",0);
1377   gMC->Gsatt("TIC1","SEEN",1);
1378   gMC->Gsatt("TIPP","SEEN",0);
1379   gMC->Gsatt("TIC3","SEEN",0);
1380   gMC->Gsatt("TRCE","SEEN",0);
1381   gMC->Gsatt("TPSC","SEEN",0);
1382   gMC->Gsatt("TPCC","SEEN",0);
1383   gMC->Gsatt("TORC","SEEN",0);
1384   gMC->Gsatt("TOPP","SEEN",0);
1385   gMC->Gsatt("TOC3","SEEN",0);
1386   gMC->Gsatt("TOC1","SEEN",1);
1387   gMC->Gsatt("TSSW","SEEN",1);
1388   gMC->Gsatt("TSWC","SEEN",1);
1389   gMC->Gsatt("TSSW","COLO",3);
1390   gMC->Gsatt("TSWC","COLO",3);
1391   gMC->Gsatt("TSCE","COLO",6);
1392   gMC->Gsatt("TSCE","SEEN",1);
1393   gMC->Gsatt("TWES","SEEN",0);
1394   gMC->Gsatt("TSWB","SEEN",0);
1395   gMC->Gsatt("TPEL","SEEN",0);
1396   gMC->Gsatt("TPMW","SEEN",1);
1397   gMC->Gsatt("TESR","SEEN",1);
1398   gMC->Gsatt("TPMW","COLO",12);
1399   gMC->Gsatt("TIC1","COLO",5);
1400   gMC->Gsatt("TOC1","COLO",5);
1401   gMC->Gsatt("TESB","SEEN",0);
1402   gMC->Gsatt("THVM","SEEN",1);
1403   gMC->Gsatt("THVM","COLO",11);
1404   gMC->Gsatt("THVH","SEEN",0);
1405   gMC->Gsatt("TPSR","SEEN",0);
1406   gMC->Gsatt("THVL","SEEN",0);
1407   gMC->Gsatt("THVC","SEEN",0);
1408   gMC->Gsatt("THVE","SEEN",0);
1409   gMC->Gsatt("THVR","SEEN",0);
1410   gMC->Gsatt("TPSS","SEEN",0);
1411   gMC->Gsatt("TPUS","SEEN",0);
1412   gMC->Gsatt("TPLS","SEEN",0);
1413
1414   //
1415   gMC->Gdopt("hide", "on");
1416   gMC->Gdopt("shad", "on");
1417   gMC->Gsatt("*", "fill", 7);
1418   gMC->SetClipBox(".");
1419   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1420   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1421   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1422   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1423   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1424   gMC->DefaultRange();
1425   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1426   gMC->Gdhead(1111, "Time Projection Chamber");
1427   gMC->Gdman(18, 4, "MAN");
1428   gMC->Gdopt("hide","off");
1429 }
1430
1431 //_____________________________________________________________________________
1432 void AliTPCv2::CreateMaterials()
1433 {
1434   //
1435   // Define materials for version 2 of the Time Projection Chamber
1436   //
1437
1438   AliTPC::CreateMaterials();
1439 }
1440
1441 //_____________________________________________________________________________
1442 void AliTPCv2::Init()
1443 {
1444   //
1445   // Initialises version 2 of the TPC after that it has been built
1446   //
1447
1448   Int_t *idtmed = fIdtmed->GetArray();
1449
1450   AliTPC::Init();
1451
1452
1453   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1454
1455   fIDrift=gMC->VolId("TPC_Drift");
1456   fSecOld=-100; // fake number
1457
1458   gMC->SetMaxNStep(-30000); // max. number of steps increased
1459
1460   if (fPrimaryIonisation) {
1461       gMC->Gstpar(idtmed[2],"PRIMIO_E", 20.77); // 1st ionisation potential
1462
1463       gMC->Gstpar(idtmed[2],"PRIMIO_N", 14.35);
1464       gMC->Gstpar(idtmed[2],"LOSS", 14); // specific energy loss
1465       gMC->Gstpar(idtmed[2],"STRA",4);
1466   } else {
1467       gMC->Gstpar(idtmed[2],"LOSS", 5); // specific energy loss
1468   }
1469
1470
1471   AliDebug(1,"*** TPC version 2 initialized ***");
1472   AliDebug(1,Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1473
1474   //
1475
1476 }
1477
1478 //_____________________________________________________________________________
1479 void AliTPCv2::StepManager()
1480 {
1481   //
1482   // Called for every step in the Time Projection Chamber
1483   //
1484
1485   //
1486   // parameters used for the energy loss calculations
1487   //
1488   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1489   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1490   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1491   const Int_t   kMaxDistRef =15;     // maximal difference between 2 stored references
1492
1493   const Float_t kbig = 1.e10;
1494
1495   Int_t id,copy;
1496   Float_t hits[5];
1497   Int_t vol[2];
1498   TLorentzVector p;
1499
1500   vol[1]=0; // preset row number to 0
1501   //
1502   if (fPrimaryIonisation) gMC->SetMaxStep(kbig);
1503
1504   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1505
1506   Float_t charge = gMC->TrackCharge();
1507
1508   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1509
1510   // check the sensitive volume
1511
1512   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1513   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1514
1515   gMC->TrackPosition(p);
1516   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1517   //
1518
1519   //
1520   Double_t angle = TMath::ACos(p[0]/r);
1521   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1522   //
1523   // angular segment, it is not a real sector number...
1524   //
1525   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1526                fTPCParam->GetInnerAngle());
1527   // rotate to segment "0"
1528   Float_t cos,sin;
1529   fTPCParam->AdjustCosSin(sector,cos,sin);
1530   Float_t x1=p[0]*cos + p[1]*sin;
1531   // check if within sector's limits
1532   if((x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp())
1533      ||(x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp())){
1534   // calculate real sector number...
1535   if (x1>fTPCParam->GetOuterRadiusLow()){
1536     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1537              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1538     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1539   }
1540     else
1541       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1542   //
1543   // here I have a sector number
1544   //
1545
1546   vol[0]=sector;
1547
1548   static Double_t lastReferenceR=0;
1549   if (TMath::Abs(lastReferenceR-r)>kMaxDistRef){
1550     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTPC);
1551     lastReferenceR = r;
1552   }
1553
1554   // check if change of sector
1555   if(sector != fSecOld){
1556     fSecOld=sector;
1557     // add track reference
1558     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTPC);
1559   }
1560   // track is in the sensitive strip
1561   if(id == fIdSens){
1562     // track is entering the strip
1563     if (gMC->IsTrackEntering()){
1564       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1565       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1566       // row numbers are autonomous for lower and upper sectors
1567       if(vol[0] > fTPCParam->GetNInnerSector()) {
1568         vol[1] -= fTPCParam->GetNRowLow();
1569       }
1570     //
1571       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1572
1573         // lower sector, row 0, because Jouri wants to have this
1574
1575         gMC->TrackMomentum(p);
1576         hits[0]=p[0];
1577         hits[1]=p[1];
1578         hits[2]=p[2];
1579         hits[3]=0.; // this hit has no energy loss
1580         // Get also the track time for pileup simulation
1581         hits[4]=gMC->TrackTime();
1582
1583         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1584       }
1585     //
1586
1587        gMC->TrackPosition(p);
1588        hits[0]=p[0];
1589        hits[1]=p[1];
1590        hits[2]=p[2];
1591        hits[3]=0.; // this hit has no energy loss
1592        // Get also the track time for pileup simulation
1593        hits[4]=gMC->TrackTime();
1594
1595        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1596
1597     }
1598     else return;
1599   }
1600   //-----------------------------------------------------------------
1601   //  charged particle is in the sensitive drift volume
1602   //-----------------------------------------------------------------
1603   if(gMC->TrackStep() > 0) {
1604     Int_t nel=0;
1605     if (!fPrimaryIonisation) {
1606       nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1607     }
1608     else {
1609           Float_t edep = gMC->Edep();
1610           if (edep > 0.) nel = (Int_t)((gMC->Edep()*1.5)/kwIon) + 1;
1611     }
1612     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1613     //
1614     gMC->TrackPosition(p);
1615     hits[0]=p[0];
1616     hits[1]=p[1];
1617     hits[2]=p[2];
1618     hits[3]=(Float_t)nel;
1619
1620     // Add this hit
1621
1622     if (fHitType&&2){
1623       gMC->TrackMomentum(p);
1624       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1625       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1626       fTrackHits->SetHitPrecision(precision);
1627     }
1628
1629     // Get also the track time for pileup simulation
1630     hits[4]=gMC->TrackTime();
1631
1632     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1633
1634   } // step>0
1635   } //within sector's limits
1636   // Stemax calculation for the next step
1637
1638   Float_t pp;
1639   TLorentzVector mom;
1640   // below is valid only for Geant3 (fPromaryIonisation not set)
1641   if(!fPrimaryIonisation){
1642     gMC->TrackMomentum(mom);
1643     Float_t ptot=mom.Rho();
1644     Float_t betaGamma = ptot/gMC->TrackMass();
1645
1646     Int_t pid=gMC->TrackPid();
1647     if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1648       {
1649         pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1650       }
1651     else
1652       {
1653
1654         betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1655         pp=kprim*AliMathBase::BetheBlochAleph(betaGamma);
1656
1657     }
1658
1659     Double_t rnd = gMC->GetRandom()->Rndm();
1660
1661     gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1662   }
1663
1664 }
1665
1666