TPC/AliTPCv1.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16 /* $Id$ */
  17
  18 //
  19 ///////////////////////////////////////////////////////////////////////////////
  20 //                                                                           //
  21 //  Time Projection Chamber version 1 -- detailed TPC and fast simulation    //
  22 //                                                                           //
  23 //Begin_Html
  24 /*
  25 <img src="picts/AliTPCv1Class.gif">
  26 */
  27 //End_Html
  28 //                                                                           //
  29 //                                                                           //
  30 ///////////////////////////////////////////////////////////////////////////////
  31
  32 #include <Riostream.h>
  33 #include <stdlib.h>
  34 #include <TBRIK.h>
  35 #include <TGeometry.h>
  36 #include <TInterpreter.h>
  37 #include <TMath.h>
  38 #include <TNode.h>
  39 #include <TTUBE.h>
  40 #include <TVirtualMC.h>
  41 #include <TString.h>
  42 #include <TSystem.h>
  43
  44 #include "AliConst.h"
  45 #include "AliRun.h"
  46 #include "AliTPCDigitsArray.h"
  47 #include "AliTPCParam.h"
  48 #include "AliTPCParamSR.h"
  49 #include "AliTPCv1.h"
  50 #include "TLorentzVector.h"
  51 #include "AliMC.h"
  52 #include "TGeoManager.h"
  53 #include "TGeoVolume.h"
  54 #include "TGeoPcon.h"
  55 #include "TGeoTube.h"
  56 #include "TGeoPgon.h"
  57 #include "TGeoTrd1.h"
  58 #include "TGeoCompositeShape.h"
  59 #include "TGeoPara.h"
  60 ClassImp(AliTPCv1)
  61
  62 //_____________________________________________________________________________
  63
  64   AliTPCv1::AliTPCv1(){
  65
  66   fHitType = 1;
  67
  68 }
  69
  70 //_____________________________________________________________________________
  71 AliTPCv1::AliTPCv1(const char *name, const char *title)
  72   :AliTPC(name, title) {
  73   //
  74   // Standard constructor for Time Projection Chamber
  75   //
  76   fIdSens=0;
  77
  78
  79   if (fTPCParam)
  80      fTPCParam->Write(fTPCParam->GetTitle());
  81
  82   fHitType=1;
  83 }
  84
  85 //_____________________________________________________________________________
  86 void AliTPCv1::CreateGeometry()
  87 {
  88   //-------------------------------------------------------------
  89   // Creates geometry for Time Projection Chamber version 1
  90   // Detailed geometry -- Fast simulation - space points
  91   // at the pad-rows centers
  92   // Origin M.Kowalski, INP Cracow, Marek.Kowalski@ifj.edu.pl
  93   //-----------------------------------------------------------
  94
  95   //Begin_Html
  96   /*
  97     <img src="picts/AliTPC.gif">
  98   */
  99   //End_Html
 100   //Begin_Html
 101   /*
 102     <img src="picts/AliTPCv1Tree.gif">
 103   */
 104   //End_Html
 105   //----------------------------------------------------------
 106   // This geometry is written using TGeo class
 107   // Firstly the shapes are defined, and only then the volumes
 108   // What is recognized by the MC are volumes
 109   //----------------------------------------------------------
 110   //
 111   //  tpc - this will be the mother volume
 112   //
 113
 114   //
 115   // here I define a volume TPC
 116   // retrive the medium name with "TPC_" as a leading string
 117   //
 118   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 119   tpc->DefineSection(0,-290.,77.,278.);
 120   tpc->DefineSection(1,-259.6,70.,278.);
 121   //
 122   tpc->DefineSection(2,-259.6,68.1,278.);
 123   tpc->DefineSection(3,-253.6,68.1,278.);
 124   //
 125   tpc->DefineSection(4,-253.6,68.,278.);
 126   tpc->DefineSection(5,-74.0,60.8,278.);
 127   //
 128   tpc->DefineSection(6,-74.0,60.1,278.);
 129   tpc->DefineSection(7,-73.3,60.1,278.);
 130   //
 131   tpc->DefineSection(8,-73.3,56.9,278.);
 132   tpc->DefineSection(9,73.3,56.9,278.);
 133   //
 134   tpc->DefineSection(10,73.3,60.1,278.);
 135   tpc->DefineSection(11,74.0,60.1,278.);
 136   //
 137   tpc->DefineSection(12,74.0,60.8,278.);
 138   tpc->DefineSection(13,253.6,65.5,278.);
 139   //
 140   tpc->DefineSection(14,253.6,65.6,278.);
 141   tpc->DefineSection(15,259.6,65.6,278.);
 142   //
 143   tpc->DefineSection(16,259.6,70.0,278.);
 144   tpc->DefineSection(17,290.,77.,278.);
 145   //
 146   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 147   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 148   //
 149   // drift volume - sensitive volume, extended beyond the
 150   // endcaps, because of the alignment
 151   //
 152   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 153   dvol->DefineSection(0,-260.,74.5,264.4);
 154   dvol->DefineSection(1,-253.6,74.5,264.4);
 155   //
 156   dvol->DefineSection(2,-253.6,76.6774,258.);
 157   dvol->DefineSection(3,253.6,76.6774,258.);
 158   //
 159   dvol->DefineSection(4,253.6,74.5,264.4);
 160   dvol->DefineSection(5,260.,74.5,264.4);
 161   //
 162   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-1");
 163   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 164   //
 165   //
 166   v1->AddNode(v9,1);
 167   //
 168   // outer insulator
 169   //
 170   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 171   //
 172   tpco->DefineSection(0,-256.6,264.8,278.);
 173   tpco->DefineSection(1,-253.6,264.8,278.);
 174   //
 175   tpco->DefineSection(2,-253.6,258.,278.);
 176   tpco->DefineSection(3,250.6,258.,278.);
 177   //
 178   tpco->DefineSection(4,250.6,258.,275.5);
 179   tpco->DefineSection(5,253.6,258.,275.5);
 180   //
 181   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 182   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 183   //
 184   // outer containment vessel
 185   //
 186   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 187   //
 188   tocv->DefineSection(0,-256.6,264.8,278.);
 189   tocv->DefineSection(1,-253.6,264.8,278.);
 190   //
 191   tocv->DefineSection(2,-253.6,274.8124,278.);
 192   tocv->DefineSection(3,247.6,274.8124,278.);
 193   //
 194   tocv->DefineSection(4,247.6,270.4,278.);
 195   tocv->DefineSection(5,250.6,270.4,278.);
 196   //
 197   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 198   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 199   //
 200   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 201   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 202   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 203   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 204   //
 205   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 206   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 207   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 208   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 209   //
 210   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 211   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 212   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 213   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 214
 215   //-------------------------------------------------------
 216   //  Tpc Outer Field Cage
 217   //  daughters - composite (sandwich)
 218   //-------------------------------------------------------
 219
 220   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 221   //
 222   tofc->DefineSection(0,-253.6,258.,269.6);
 223   tofc->DefineSection(1,-250.6,258.,269.6);
 224   //
 225   tofc->DefineSection(2,-250.6,258.,260.0676);
 226   tofc->DefineSection(3,250.6,258.,260.0676);
 227   //
 228   tofc->DefineSection(4,250.6,258.,275.5);
 229   tofc->DefineSection(5,253.6,258.,275.5);
 230   //
 231   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 232   //sandwich
 233   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 234   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 235   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 236   //
 237   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 238   //
 239   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 240   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 241   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 242   //
 243   // outer part - positioning
 244   //
 245   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 246   //
 247   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 248   //
 249   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 250   //
 251   v2->AddNode(v3,1); v2->AddNode(v4,1);
 252   //
 253   v1->AddNode(v2,1);
 254   //--------------------------------------------------------------------
 255   // Tpc Inner INsulator (CO2)
 256   // the cones, the central drum and the inner f.c. sandwich with a piece
 257   // of the flane will be placed in the TPC
 258   //--------------------------------------------------------------------
 259   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 260   //
 261   tpci->DefineSection(0,-253.6,68.4,76.6774);
 262   tpci->DefineSection(1,-74.0,61.2,76.6774);
 263   //
 264   tpci->DefineSection(2,74.0,61.2,76.6774);
 265   //
 266   tpci->DefineSection(3,253.6,65.9,76.6774);
 267   //
 268   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 269   //
 270   // now the inner field cage - only part of flanges (2 copies)
 271   //
 272   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 273   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 274   //
 275  //---------------------------------------------------------
 276   // Tpc Inner Containment vessel - Muon side
 277   //---------------------------------------------------------
 278   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 279   //
 280   tcms->DefineSection(0,-259.1,68.1,74.2);
 281   tcms->DefineSection(1,-253.6,68.1,74.2);
 282   //
 283   tcms->DefineSection(2,-253.6,68.1,68.4);
 284   tcms->DefineSection(3,-74.0,60.9,61.2);
 285   //
 286   tcms->DefineSection(4,-74.0,60.1,61.2);
 287   tcms->DefineSection(5,-73.3,60.1,61.2);
 288   //
 289   tcms->DefineSection(6,-73.3,56.9,61.2);
 290   tcms->DefineSection(7,-73.0,56.9,61.2);
 291   //
 292   tcms->DefineSection(8,-73.0,56.9,58.8);
 293   tcms->DefineSection(9,-71.3,56.9,58.8);
 294   //
 295   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 296   //-----------------------------------------------
 297   // inner containment vessel - shaft side
 298   //-----------------------------------------------
 299   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 300   //
 301   tcss->DefineSection(0,71.3,56.9,58.8);
 302   tcss->DefineSection(1,73.0,56.9,58.8);
 303   //
 304   tcss->DefineSection(2,73.0,56.9,61.2);
 305   tcss->DefineSection(3,73.3,56.9,61.2);
 306   //
 307   tcss->DefineSection(4,73.3,60.1,61.2);
 308   tcss->DefineSection(5,74.0,60.1,61.2);
 309   //
 310   tcss->DefineSection(6,74.0,60.9,61.2);
 311   tcss->DefineSection(7,253.6,65.6,65.9);
 312   //
 313   tcss->DefineSection(8,253.6,65.6,74.2);
 314   tcss->DefineSection(9,258.1,65.6,74.2);
 315   //
 316   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 317   //-----------------------------------------------
 318   //  Inner field cage
 319   //  define 4 parts and make an assembly
 320   //-----------------------------------------------
 321   // part1 - Al - 2 copies
 322   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 323   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 324   // sandwich - outermost parts - 2 copies
 325   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 326   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 327   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 328   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 329   //
 330   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 331   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 332   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 333   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 334   //
 335   // middle parts - 2 copies
 336   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 337   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 338   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 339   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 340   //
 341   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 342   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 343   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 344   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 345   // central part - 1 copy
 346   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 347   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 348   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 349   //
 350   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 351   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 352   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 353   //
 354   // inner part - positioning
 355   //
 356   // creating a sandwich
 357   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 358   //
 359   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 360   //
 361   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 362   //
 363   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 364   //
 365   tv100->AddNode(tv10,1);
 366   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 367   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 368   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 369   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 370   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 371   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 372   //
 373   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 374   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 375   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 376   v9->AddNode(tv100,1);
 377   //
 378   // central drum
 379   //
 380   // flange + sandwich
 381   //
 382   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 383   cfl->DefineSection(0,-71.1,59.7,61.2);
 384   cfl->DefineSection(1,-68.6,59.7,61.2);
 385   //
 386   cfl->DefineSection(2,-68.6,60.6324,61.2);
 387   cfl->DefineSection(3,68.6,60.6324,61.2);
 388   //
 389   cfl->DefineSection(4,68.6,59.7,61.2);
 390   cfl->DefineSection(5,71.1,59.7,61.2);
 391   //
 392   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 393   // sandwich
 394   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 395   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 396   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 397   //
 398   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 399   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 400   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 401   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 402   //
 403   // seals for central drum 2 copies
 404   //
 405   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 406   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 407   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 408   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 409   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 410   //
 411   // seal collars
 412   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 413   se->DefineSection(0,-72.8,59.7,61.2);
 414   se->DefineSection(1,-72.3,59.7,61.2);
 415   //
 416   se->DefineSection(2,-72.3,58.85,61.2);
 417   se->DefineSection(3,-71.6,58.85,61.2);
 418   //
 419   se->DefineSection(4,-71.6,59.7,61.2);
 420   se->DefineSection(5,-71.3,59.7,61.2);
 421   //
 422   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 423   //
 424   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 425   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 426   //
 427   // define reflection matrix
 428   //
 429   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,270.,180.,0.);
 430   //
 431   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 432   //
 433   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-72.1));
 434   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,72.1));
 435   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 436   //
 437   // central membrane - 2 rings and a mylar membrane - assembly
 438   //
 439   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 440   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 441   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 442   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 443   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 444   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 445   //
 446   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 447   cm->AddNode(ihv,1);
 448   cm->AddNode(ohv,1);
 449   cm->AddNode(memv,1);
 450   v9->AddNode(cm,1);
 451   //
 452   // end caps - they are make as an assembly of single segments
 453   // containing both readout chambers
 454   //
 455   Double_t OpeningAngle = 10.*TMath::DegToRad();
 456   Double_t thick=1.5; // rib
 457   Double_t shift = thick/TMath::Sin(OpeningAngle);
 458   //
 459   Double_t LowEdge = 86.3; // hole in the wheel
 460   Double_t UpEdge = 240.4; // hole in the wheel
 461   //
 462   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 463   //
 464   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 465   //
 466   hole->DefineSection(0,-3.5,LowEdge-shift,UpEdge-shift);
 467   hole->DefineSection(1,-1.5,LowEdge-shift,UpEdge-shift);
 468   //
 469   hole->DefineSection(2,-1.5,LowEdge-shift,UpEdge+3.-shift);
 470   hole->DefineSection(3,3.5,LowEdge-shift,UpEdge+3.-shift);
 471   //
 472   Double_t ys = shift*TMath::Sin(OpeningAngle);
 473   Double_t xs = shift*TMath::Cos(OpeningAngle);
 474   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 475   tr->RegisterYourself();
 476   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 477   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 478   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 479   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 480   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 481   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 482   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 483   //
 484   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 485   //
 486   // readout chambers
 487   //
 488   // IROC first
 489   //
 490    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 491    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 492   // empty space
 493    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 494    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 495    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 496    //bars
 497    Double_t tga = (19.8328-12.3742)/39.3;
 498    Double_t xmin,xmax;
 499    xmin = 9.55*tga+12.3742;
 500    xmax = 9.95*tga+12.3742;
 501    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 502    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 503    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 504    xmin=19.4*tga+12.3742;
 505    xmax=19.9*tga+12.3742;
 506    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 507    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 508    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 509    xmin=29.35*tga+12.3742;
 510    xmax=29.75*tga+12.3742;
 511    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 512    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 513    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 514    //
 515    // holes for connectors
 516    //
 517    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 518    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 519    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 520    fileName += "/TPC/conn_iroc.dat";
 521    ifstream in;
 522    in.open(fileName.Data(), ios_base::in); // asci file
 523    for(Int_t i =0;i<86;i++){
 524       Double_t y = 3.99;
 525       Double_t x,z,ang;
 526       in>>x>>z>>ang;
 527       z-=26.5;
 528       TGeoRotation *rrr = new TGeoRotation();
 529       rrr->RotateY(ang);
 530       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 531       ibdv->AddNode(connv,i+1,trans);
 532    }
 533    in.close();
 534    // "cap"
 535    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 536    // "hole"
 537    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 538    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 539    tr1->RegisterYourself();
 540    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 541    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 542    //
 543    // pad plane and wire fixations
 544    //
 545    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 546    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 547    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 548    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 549    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 550    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 551    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 552    //
 553    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 554    //
 555    iroc->AddNode(ibdv,1);
 556    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 557    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 558    tga =(23.3521-14.5974)/49.65;
 559    Double_t xx = 24.825*tga+14.5974-0.6;
 560    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 561    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 562    //
 563    // OROC
 564    //
 565    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 566    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 567    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 568    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 569    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 570    //horizontal bars
 571    tga=(38.5084-20.2938)/99.3;
 572    xmin=tga*10.2+20.2938;
 573    xmax=tga*10.6+20.2938;
 574    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 575    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 576    //
 577    xmin=22.55*tga+20.2938;
 578    xmax=24.15*tga+20.2938;
 579    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 580    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 581    //
 582    xmin=36.1*tga+20.2938;
 583    xmax=36.5*tga+20.2938;
 584    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 585    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 586    //
 587    xmin=49.0*tga+20.2938;
 588    xmax=50.6*tga+20.2938;
 589    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 590    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 591    //
 592    xmin=63.6*tga+20.2938;
 593    xmax=64.0*tga+20.2938;
 594    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 595    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 596    //
 597    xmin=75.5*tga+20.2938;
 598    xmax=77.15*tga+20.2938;
 599    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 600    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 601    //
 602    xmin=88.7*tga+20.2938;
 603    xmax=89.1*tga+20.2938;
 604    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 605    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 606    //
 607    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 608    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 609    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 610    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 611    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 612    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 613    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 614    // vertical bars
 615    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 616    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 617    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 618    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 619    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 620    //
 621    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 622    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 623    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 624    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 625    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 626    //
 627    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 628    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 629    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 630    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 631    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 632    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 633    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 634    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 635    //
 636    // holes for connectors
 637    //
 638    fileName = gSystem->Getenv("ALICE_ROOT");
 639    fileName += "/TPC/conn_oroc.dat";
 640    in.open(fileName.Data(), ios_base::in); // asci file
 641    for(Int_t i =0;i<78;i++){
 642       Double_t y =3.89;
 643       Double_t x,z,ang;
 644       Double_t x1,z1,x2,z2;
 645       in>>x>>z>>ang;
 646       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 647       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 648       //
 649       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 650       //
 651       TGeoRotation *rr = new TGeoRotation();
 652       rr->RotateY(ang);
 653       z1-=54.95;
 654       z2-=54.95;
 655       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 656       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 657       obdv->AddNode(connv,i+1,trans1);
 658       obdv->AddNode(connv,i+79,trans2);
 659    }
 660    in.close();
 661    // cap
 662    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 663    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 664    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 665    tr5->RegisterYourself();
 666    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 667    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 668    //
 669    // pad plane and wire fixations
 670    //
 671    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 672    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 673    //
 674    tga=(43.5239-23.3874)/114.2;
 675    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 676    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 677    xx = 57.1*tga+23.3874-0.7;
 678    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 679    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 680    //
 681    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 682    //
 683    oroc->AddNode(obdv,1);
 684    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 685    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 686    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 687    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 688    //
 689    // now iroc and oroc are placed into a sector...
 690    //
 691    TGeoVolumeAssembly *sect = new TGeoVolumeAssembly("TPC_SECT");
 692    TGeoRotation rot1("rot1",90.,90.,0.);
 693    TGeoRotation rot2("rot2");
 694    rot2.RotateY(10.);
 695    TGeoRotation *rot = new TGeoRotation("rot");
 696    *rot=rot1*rot2;
 697    //
 698    Double_t x0,y0;
 699    x0=110.2*TMath::Cos(OpeningAngle);
 700    y0=110.2*TMath::Sin(OpeningAngle);
 701    TGeoCombiTrans *combi1 = new TGeoCombiTrans("combi1",x0,y0,1.09,rot);
 702    x0=188.45*TMath::Cos(OpeningAngle);
 703    y0=188.45*TMath::Sin(OpeningAngle);
 704    TGeoCombiTrans *combi2 = new TGeoCombiTrans("combi2",x0,y0,0.99,rot);
 705    //
 706    sect->AddNode(ch,1);
 707    sect->AddNode(iroc,1,combi1);
 708    sect->AddNode(oroc,1,combi2);
 709    //
 710    // segment is ready...
 711    // now I try to make a wheel...
 712    //
 713    TGeoVolumeAssembly *wheel = new TGeoVolumeAssembly("TPC_ENDCAP");
 714    //
 715    for(Int_t i =0;i<18;i++){
 716      Double_t phi = (20.*i);
 717      TGeoRotation *r = new TGeoRotation();
 718      r->RotateZ(phi);
 719      wheel->AddNode(sect,i+1,r);
 720
 721    }
 722    // wheels in the drift volume!
 723    v9->AddNode(wheel,1,new TGeoTranslation(0.,0.,-256.6));
 724    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 725    v9->AddNode(wheel,2,combi3);
 726
 727    //_____________________________________________________________
 728    // service support wheel
 729    //_____________________________________________________________
 730   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 731   sw->DefineSection(0,-4.,80.5,251.75);
 732   sw->DefineSection(1,4.,80.5,251.75);
 733   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 734   //
 735   thick=1.;
 736   shift = thick/TMath::Sin(OpeningAngle);
 737   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 738   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 739   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 740   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 741   //
 742   ys = shift*TMath::Sin(OpeningAngle);
 743   xs = shift*TMath::Cos(OpeningAngle);
 744   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 745   // cover
 746   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 747   co->DefineSection(0,-0.5,77.,255.25);
 748   co->DefineSection(1,0.5,77.,255.25);
 749   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 750   // hole in a cover
 751   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 752   shift=4./TMath::Sin(OpeningAngle);
 753   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 754   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 755   //
 756   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 757   //
 758   ys = shift*TMath::Sin(OpeningAngle);
 759   xs = shift*TMath::Cos(OpeningAngle);
 760   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 761   //
 762   // Sector as an Assembly
 763   //
 764   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 765   swhs->AddNode(swv,1);
 766   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 767   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 768   //
 769   // SSW as an Assembly of sectors
 770   //
 771  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 772    for(Int_t i =0;i<18;i++){
 773      Double_t phi = (20.*i);
 774      TGeoRotation *r = new TGeoRotation();
 775      r->RotateZ(phi);
 776      swheel->AddNode(swhs,i+1,r);
 777    }
 778    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 779    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 780
 781    // sensitive strips
 782    TGeoMedium *m8 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 783    Int_t totrows;
 784    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 785    Double_t *upar;
 786    upar=NULL;
 787    gGeoManager->Volume("TPC_Strip","PGON",m8->GetId(),upar);
 788    upar=new Double_t [10];
 789    upar[0]=0.;
 790    upar[1]=360.;
 791    upar[2]=18.;
 792    upar[3]=2.;
 793    //
 794    upar[4]=-124.8;
 795    upar[7]=124.8;
 796
 797    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 798
 799    upar[5]=rlow;
 800    upar[6]=rlow+.01;
 801    upar[8]=upar[5];
 802    upar[9]=upar[6];
 803    //
 804    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 805    gGeoManager->Node("TPC_Strip",totrows+1,
 806                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 807    //
 808    // now, strips
 809    //
 810      //lower sectors
 811      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 812        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 813        upar[5]=rlow;
 814        upar[6]=rlow+.01;
 815        upar[8]=upar[5];
 816        upar[9]=upar[6];
 817        gGeoManager->Node("TPC_Strip",i,
 818                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 819        gGeoManager->Node("TPC_Strip",totrows+i,
 820                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 821      }
 822      //upper sectors
 823      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 824        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 825        upar[5]=rlow;
 826        upar[6]=rlow+.01;
 827        upar[8]=upar[5];
 828        upar[9]=upar[6];
 829        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 830                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 831        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 832                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 833      }
 834
 835   //----------------------------------------------------------
 836   // TPc Support Rods - MAKROLON
 837   //----------------------------------------------------------
 838   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 839   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 840   // upper and lower rods differ in length!
 841   delete [] upar;
 842   upar=NULL;
 843   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 844   upar=new Double_t [3];
 845   upar[0]=1.8;
 846   upar[1]=2.2;
 847
 848   //
 849   //HV rods - makrolon + 0.58cm (diameter) Cu
 850   TGeoTube *hvr = new TGeoTube(0.,4.4,126.64);
 851   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 852   //
 853   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 854   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 855   hvrv->AddNode(hvcv,1);
 856
 857   for(Int_t i=0;i<17;i++){
 858     Double_t angle,x,y;
 859     Double_t z,r;
 860     angle=TMath::DegToRad()*20.*(Double_t)i;
 861     r=81.5;
 862     x=r * TMath::Cos(angle);
 863     y=r * TMath::Sin(angle);
 864     upar[2]=126.64; //lower
 865     z= 126.96;
 866     if(i==15){
 867       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 868       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 869     }
 870     else{
 871      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 872      gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 873     }
 874     r=254.25;
 875     x=r * TMath::Cos(angle);
 876     y=r * TMath::Sin(angle);
 877     upar[2]=126.54; //upper
 878     z=127.06;
 879     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 880     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 881   }
 882
 883   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 884   alice->AddNode(v1,1);
 885
 886 } // end of function
 887
 888 //_____________________________________________________________________________
 889 void AliTPCv1::DrawDetector()
 890 {
 891   //
 892   // Draw a shaded view of the Time Projection Chamber version 1
 893   //
 894
 895   // Set everything unseen
 896   gMC->Gsatt("*", "seen", -1);
 897   //
 898   // Set ALIC mother transparent
 899   gMC->Gsatt("ALIC","SEEN",0);
 900   //
 901   // Set the volumes visible
 902   gMC->Gsatt("TPC ","SEEN",0);
 903   gMC->Gsatt("TOIN","SEEN",1);
 904   gMC->Gsatt("TOIN","COLO",7);
 905   gMC->Gsatt("TOCV","SEEN",1);
 906   gMC->Gsatt("TOCV","COLO",4);
 907   gMC->Gsatt("TSA1","SEEN",0);
 908   gMC->Gsatt("TSA2","SEEN",0);
 909   gMC->Gsatt("TSA3","SEEN",0);
 910   gMC->Gsatt("TSA4","SEEN",0);
 911   gMC->Gsatt("TSA5","SEEN",0);
 912   gMC->Gsatt("TOFC","SEEN",1);
 913   gMC->Gsatt("TOFC","COLO",4);
 914   gMC->Gsatt("TSA6","SEEN",0);
 915   gMC->Gsatt("TSA7","SEEN",0);
 916   gMC->Gsatt("TSA8","SEEN",0);
 917   gMC->Gsatt("TIIN","SEEN",1);
 918   gMC->Gsatt("TIIN","COLO",7);
 919   gMC->Gsatt("TII1","SEEN",0);
 920   gMC->Gsatt("TIFC","SEEN",1);
 921   gMC->Gsatt("TIFC","COLO",4);
 922   gMC->Gsatt("TSA9","SEEN",0);
 923   gMC->Gsatt("TS10","SEEN",0);
 924   gMC->Gsatt("TS11","SEEN",0);
 925   gMC->Gsatt("TS12","SEEN",0);
 926   gMC->Gsatt("TS13","SEEN",0);
 927   gMC->Gsatt("TS14","SEEN",0);
 928   gMC->Gsatt("TICC","SEEN",0);
 929   gMC->Gsatt("TICM","SEEN",0);
 930   gMC->Gsatt("TS15","SEEN",0);
 931   gMC->Gsatt("TS16","SEEN",0);
 932   gMC->Gsatt("TS17","SEEN",0);
 933   gMC->Gsatt("TS18","SEEN",0);
 934   gMC->Gsatt("TS19","SEEN",0);
 935   gMC->Gsatt("TPJ1","SEEN",0);
 936   gMC->Gsatt("TPJ2","SEEN",0);
 937   gMC->Gsatt("TICS","SEEN",0);
 938   gMC->Gsatt("TDGN","SEEN",0);
 939   gMC->Gsatt("TIRC","SEEN",0);
 940   gMC->Gsatt("TIC1","SEEN",1);
 941   gMC->Gsatt("TIPP","SEEN",0);
 942   gMC->Gsatt("TIC3","SEEN",0);
 943   gMC->Gsatt("TRCE","SEEN",0);
 944   gMC->Gsatt("TPSC","SEEN",0);
 945   gMC->Gsatt("TPCC","SEEN",0);
 946   gMC->Gsatt("TORC","SEEN",0);
 947   gMC->Gsatt("TOPP","SEEN",0);
 948   gMC->Gsatt("TOC3","SEEN",0);
 949   gMC->Gsatt("TOC1","SEEN",1);
 950   gMC->Gsatt("TSSW","SEEN",1);
 951   gMC->Gsatt("TSWC","SEEN",1);
 952   gMC->Gsatt("TSSW","COLO",3);
 953   gMC->Gsatt("TSWC","COLO",3);
 954   gMC->Gsatt("TSCE","COLO",6);
 955   gMC->Gsatt("TSCE","SEEN",1);
 956   gMC->Gsatt("TWES","SEEN",0);
 957   gMC->Gsatt("TSWB","SEEN",0);
 958   gMC->Gsatt("TPEL","SEEN",0);
 959   gMC->Gsatt("TPMW","SEEN",1);
 960   gMC->Gsatt("TESR","SEEN",1);
 961   gMC->Gsatt("TPMW","COLO",12);
 962   gMC->Gsatt("TIC1","COLO",5);
 963   gMC->Gsatt("TOC1","COLO",5);
 964   gMC->Gsatt("TESB","SEEN",0);
 965   gMC->Gsatt("THVM","SEEN",1);
 966   gMC->Gsatt("THVM","COLO",11);
 967   gMC->Gsatt("THVH","SEEN",0);
 968   gMC->Gsatt("TPSR","SEEN",0);
 969   gMC->Gsatt("THVL","SEEN",0);
 970   gMC->Gsatt("THVC","SEEN",0);
 971   gMC->Gsatt("THVE","SEEN",0);
 972   gMC->Gsatt("THVR","SEEN",0);
 973   gMC->Gsatt("TPSS","SEEN",0);
 974   gMC->Gsatt("TPUS","SEEN",0);
 975   gMC->Gsatt("TPLS","SEEN",0);
 976
 977   //
 978   gMC->Gdopt("hide", "on");
 979   gMC->Gdopt("shad", "on");
 980   gMC->Gsatt("*", "fill", 7);
 981   gMC->SetClipBox(".");
 982   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
 983   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
 984   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
 985   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
 986   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
 987   gMC->DefaultRange();
 988   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
 989   gMC->Gdhead(1111, "Time Projection Chamber");
 990   gMC->Gdman(18, 4, "MAN");
 991   gMC->Gdopt("hide","off");
 992 }
 993
 994 //_____________________________________________________________________________
 995 void AliTPCv1::CreateMaterials()
 996 {
 997   //
 998   // Define materials for Time Projection Chamber
 999   //
1000   AliTPC::CreateMaterials();
1001 }
1002
1003 //_____________________________________________________________________________
1004 void AliTPCv1::Init()
1005 {
1006   //
1007   // Initialises TPC detector after it has been created
1008   //
1009
1010   fIdSens=gMC->VolId("TPC_Strip"); // sensitive strip
1011
1012   printf("%s: *** TPC version 1 initialized***\n",ClassName());
1013
1014   // printf("TPC version 1 initialized\n");
1015 }
1016
1017 //_____________________________________________________________________________
1018 void AliTPCv1::StepManager()
1019 {
1020   //
1021   // Called at every step in the Time Projection Chamber
1022   //
1023   Int_t         copy, id, i;
1024   Float_t       hits[5];
1025   Int_t         vol[2];
1026   TLorentzVector p;
1027  //
1028
1029   id = gMC->CurrentVolID(copy);
1030   if(id!=fIdSens) return;
1031   if(gMC->TrackCharge() && gMC->IsTrackEntering()) {
1032
1033     //
1034     // Only charged tracks entering the sensitive volume
1035     //
1036
1037       gMC->TrackPosition(p);
1038   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1039   //
1040
1041   //
1042   Double_t angle = TMath::ACos(p[0]/r);
1043   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1044   //
1045   // angular segment, it is not a real sector number...
1046   //
1047   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1048                fTPCParam->GetInnerAngle());
1049   // rotate to segment "0"
1050   Float_t cos,sin;
1051   fTPCParam->AdjustCosSin(sector,cos,sin);
1052   Float_t x1 = p[0]*cos + p[1]*sin;
1053   Float_t y1 = TMath::Abs(-p[0]*sin + p[1]*cos);
1054   // calculate real sector number...
1055   if (x1>fTPCParam->GetOuterRadiusLow()){
1056     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1057              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1058     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1059   }
1060     else
1061       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1062   //
1063   // here I have a sector number
1064   //
1065   vol[0]=sector;
1066   //
1067   Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1068   vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1069   // row numbers are autonomous for lower and upper sectors
1070   if(vol[0] > fTPCParam->GetNInnerSector()) {
1071      vol[1] -= fTPCParam->GetNRowLow();
1072   }
1073   Double_t range = (sector<36) ? fTPCParam->GetYInner(vol[1]) :
1074                    fTPCParam->GetYOuter(vol[1]);
1075   if(y1>range) return;
1076      if(vol[1] == 0){
1077
1078         // because Jouri wants to have this
1079
1080         gMC->TrackMomentum(p);
1081         hits[0]=p[0];
1082         hits[1]=p[1];
1083         hits[2]=p[2];
1084         hits[3]=0.; // this hit has no energy loss
1085         // Get also the track time for pileup simulation
1086         hits[4]=gMC->TrackTime();
1087
1088         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.
1089      }
1090    gMC->TrackPosition(p);
1091       for(i=0;i<3;++i) hits[i]=p[i];
1092       hits[3]=1; //I'd like to have something positive here (I.Belikov)
1093       // Get also the track time for pileup simulation
1094       hits[4]=gMC->TrackTime();
1095
1096       AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.
1097
1098   }// track entering sensitive strip
1099
1100 }
1101 //_____________________________________________________________________________
1102
1103
1104