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 <TMath.h>
  36 #include <TPDGCode.h>
  37 #include <TVirtualMC.h>
  38 #include <TString.h>
  39 #include <TSystem.h>
  40
  41 #include "AliConst.h"
  42 #include "AliLog.h"
  43 #include "AliMC.h"
  44 #include "AliRun.h"
  45 #include "AliTPCDigitsArray.h"
  46 #include "AliTPCParam.h"
  47 #include "AliTPCParamSR.h"
  48 #include "AliTPCTrackHitsV2.h"
  49 #include "AliTPCv2.h"
  50 #include "TGeoManager.h"
  51 #include "TGeoVolume.h"
  52 #include "TGeoPcon.h"
  53 #include "TGeoTube.h"
  54 #include "TGeoPgon.h"
  55 #include "TGeoTrd1.h"
  56 #include "TGeoCompositeShape.h"
  57 #include "TGeoPara.h"
  58 ClassImp(AliTPCv2)
  59
  60 //_____________________________________________________________________________
  61 AliTPCv2::AliTPCv2(const char *name, const char *title) :
  62   AliTPC(name, title)
  63 {
  64   //
  65   // Standard constructor for Time Projection Chamber version 2
  66   //
  67
  68   SetSens(-1); // no strips selected
  69
  70
  71   SetBufferSize(128000);
  72
  73
  74   if (fTPCParam)
  75      fTPCParam->Write(fTPCParam->GetTitle());
  76 }
  77
  78 //_____________________________________________________________________________
  79 void AliTPCv2::CreateGeometry()
  80 {
  81   //
  82   // Create the geometry of Time Projection Chamber version 2
  83   //
  84   //Begin_Html
  85   /*
  86     <img src="picts/AliTPC.gif">
  87   */
  88   //End_Html
  89   //Begin_Html
  90   /*
  91     <img src="picts/AliTPCv2Tree.gif">
  92   */
  93   //End_Html
  94
  95   //----------------------------------------------------------
  96   // This geometry is written using TGeo class
  97   // Firstly the shapes are defined, and only then the volumes
  98   // What is recognized by the MC are volumes
  99   //----------------------------------------------------------
 100   //
 101   //  tpc - this will be the mother volume
 102   //
 103
 104   //
 105   // here I define a volume TPC
 106   // retrive the medium name with "TPC_" as a leading string
 107   //
 108   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 109   tpc->DefineSection(0,-290.,77.,278.);
 110   tpc->DefineSection(1,-259.6,77.,278.);
 111   //
 112   tpc->DefineSection(2,-259.6,68.1,278.);
 113   tpc->DefineSection(3,-253.6,68.1,278.);
 114   //
 115   tpc->DefineSection(4,-253.6,68.,278.);
 116   tpc->DefineSection(5,-74.0,60.8,278.);
 117   //
 118   tpc->DefineSection(6,-74.0,60.1,278.);
 119   tpc->DefineSection(7,-73.3,60.1,278.);
 120   //
 121   tpc->DefineSection(8,-73.3,56.9,278.);
 122   tpc->DefineSection(9,73.3,56.9,278.);
 123   //
 124   tpc->DefineSection(10,73.3,60.1,278.);
 125   tpc->DefineSection(11,74.0,60.1,278.);
 126   //
 127   tpc->DefineSection(12,74.0,60.8,278.);
 128   tpc->DefineSection(13,253.6,65.5,278.);
 129   //
 130   tpc->DefineSection(14,253.6,65.6,278.);
 131   tpc->DefineSection(15,259.6,65.6,278.);
 132   //
 133   tpc->DefineSection(16,259.6,77.0,278.);
 134   tpc->DefineSection(17,290.,77.,278.);
 135   //
 136   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 137   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 138   //
 139   // drift volume - sensitive volume, extended beyond the
 140   // endcaps, because of the alignment
 141   //
 142   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 143   dvol->DefineSection(0,-260.,74.5,264.4);
 144   dvol->DefineSection(1,-253.6,74.5,264.4);
 145   //
 146   dvol->DefineSection(2,-253.6,76.6774,258.);
 147   dvol->DefineSection(3,253.6,76.6774,258.);
 148   //
 149   dvol->DefineSection(4,253.6,74.5,264.4);
 150   dvol->DefineSection(5,260.,74.5,264.4);
 151   //
 152   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 153   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 154   //
 155   v1->AddNode(v9,1);
 156   //
 157   // outer insulator
 158   //
 159   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 160   //
 161   tpco->DefineSection(0,-256.6,264.8,278.);
 162   tpco->DefineSection(1,-253.6,264.8,278.);
 163   //
 164   tpco->DefineSection(2,-253.6,258.,278.);
 165   tpco->DefineSection(3,250.6,258.,278.);
 166   //
 167   tpco->DefineSection(4,250.6,258.,275.5);
 168   tpco->DefineSection(5,253.6,258.,275.5);
 169   //
 170   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 171   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 172   //
 173   // outer containment vessel
 174   //
 175   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 176   //
 177   tocv->DefineSection(0,-256.6,264.8,278.);
 178   tocv->DefineSection(1,-253.6,264.8,278.);
 179   //
 180   tocv->DefineSection(2,-253.6,274.8124,278.);
 181   tocv->DefineSection(3,247.6,274.8124,278.);
 182   //
 183   tocv->DefineSection(4,247.6,270.4,278.);
 184   tocv->DefineSection(5,250.6,270.4,278.);
 185   //
 186   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 187   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 188   //
 189   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 190   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 191   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 192   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 193   //
 194   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 195   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 196   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 197   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 198   //
 199   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 200   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 201   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 202   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 203  //-------------------------------------------------------
 204   //  Tpc Outer Field Cage
 205   //  daughters - composite (sandwich)
 206   //-------------------------------------------------------
 207
 208   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 209   //
 210   tofc->DefineSection(0,-253.6,258.,269.6);
 211   tofc->DefineSection(1,-250.6,258.,269.6);
 212   //
 213   tofc->DefineSection(2,-250.6,258.,260.0676);
 214   tofc->DefineSection(3,250.6,258.,260.0676);
 215   //
 216   tofc->DefineSection(4,250.6,258.,275.5);
 217   tofc->DefineSection(5,253.6,258.,275.5);
 218   //
 219   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 220   //sandwich
 221   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 222   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 223   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 224   //
 225   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 226   //
 227   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 228   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 229   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 230   //
 231   // outer part - positioning
 232   //
 233   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 234   //
 235   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 236   //
 237   v3->AddNode(tov1,1); v4->AddNode(tf1v,1);
 238   //
 239   v2->AddNode(v3,1); v2->AddNode(v4,1);
 240   //
 241   v1->AddNode(v2,1);
 242   //--------------------------------------------------------------------
 243   // Tpc Inner INsulator (CO2)
 244   // the cones, the central drum and the inner f.c. sandwich with a piece
 245   // of the flane will be placed in the TPC
 246   //--------------------------------------------------------------------
 247   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 248   //
 249   tpci->DefineSection(0,-253.6,68.4,76.6774);
 250   tpci->DefineSection(1,-74.0,61.2,76.6774);
 251   //
 252   tpci->DefineSection(2,74.0,61.2,76.6774);
 253   //
 254   tpci->DefineSection(3,253.6,65.9,76.6774);
 255   //
 256   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 257   //
 258   // now the inner field cage - only part of flanges (2 copies)
 259   //
 260   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 261   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 262   //
 263  //---------------------------------------------------------
 264   // Tpc Inner Containment vessel - Muon side
 265   //---------------------------------------------------------
 266   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 267   //
 268   tcms->DefineSection(0,-259.1,68.1,74.2);
 269   tcms->DefineSection(1,-253.6,68.1,74.2);
 270   //
 271   tcms->DefineSection(2,-253.6,68.1,68.4);
 272   tcms->DefineSection(3,-74.0,60.9,61.2);
 273   //
 274   tcms->DefineSection(4,-74.0,60.1,61.2);
 275   tcms->DefineSection(5,-73.3,60.1,61.2);
 276   //
 277   tcms->DefineSection(6,-73.3,56.9,61.2);
 278   tcms->DefineSection(7,-73.0,56.9,61.2);
 279   //
 280   tcms->DefineSection(8,-73.0,56.9,58.8);
 281   tcms->DefineSection(9,-71.3,56.9,58.8);
 282   //
 283   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 284   //-----------------------------------------------
 285   // inner containment vessel - shaft side
 286   //-----------------------------------------------
 287   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 288   //
 289   tcss->DefineSection(0,71.3,56.9,58.8);
 290   tcss->DefineSection(1,73.0,56.9,58.8);
 291   //
 292   tcss->DefineSection(2,73.0,56.9,61.2);
 293   tcss->DefineSection(3,73.3,56.9,61.2);
 294   //
 295   tcss->DefineSection(4,73.3,60.1,61.2);
 296   tcss->DefineSection(5,74.0,60.1,61.2);
 297   //
 298   tcss->DefineSection(6,74.0,60.9,61.2);
 299   tcss->DefineSection(7,253.6,65.6,65.9);
 300   //
 301   tcss->DefineSection(8,253.6,65.6,74.2);
 302   tcss->DefineSection(9,258.1,65.6,74.2);
 303   //
 304   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 305   //-----------------------------------------------
 306   //  Inner field cage
 307   //  define 4 parts and make an assembly
 308   //-----------------------------------------------
 309   // part1 - Al - 2 copies
 310   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 311   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 312   // sandwich - outermost parts - 2 copies
 313   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 314   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 315   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 316   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 317   //
 318   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 319   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 320   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 321   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 322   //
 323   // middle parts - 2 copies
 324   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 325   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 326   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 327   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 328   //
 329   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 330   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 331   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 332   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 333   // central part - 1 copy
 334   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 335   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 336   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 337   //
 338   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 339   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 340   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 341   //
 342   // inner part - positioning
 343   //
 344   // creating a sandwich
 345   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 346   //
 347   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 348   //
 349   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 350   //
 351   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 352   //
 353   tv100->AddNode(tv10,1);
 354   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 355   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 356   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 357   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 358   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 359   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 360   //
 361   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 362   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 363   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 364   v9->AddNode(tv100,1);
 365   //
 366   // central drum
 367   //
 368   // flange + sandwich
 369   //
 370   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 371   cfl->DefineSection(0,-71.1,59.7,61.2);
 372   cfl->DefineSection(1,-68.6,59.7,61.2);
 373   //
 374   cfl->DefineSection(2,-68.6,60.6324,61.2);
 375   cfl->DefineSection(3,68.6,60.6324,61.2);
 376   //
 377   cfl->DefineSection(4,68.6,59.7,61.2);
 378   cfl->DefineSection(5,71.1,59.7,61.2);
 379   //
 380   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 381   // sandwich
 382   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 383   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 384   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 385   //
 386   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 387   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 388   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 389   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 390   //
 391   // seals for central drum 2 copies
 392   //
 393   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 394   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 395   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 396   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 397   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 398   //
 399   // seal collars
 400   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 401   se->DefineSection(0,-72.8,59.7,61.2);
 402   se->DefineSection(1,-72.3,59.7,61.2);
 403   //
 404   se->DefineSection(2,-72.3,58.85,61.2);
 405   se->DefineSection(3,-71.6,58.85,61.2);
 406   //
 407   se->DefineSection(4,-71.6,59.7,61.2);
 408   se->DefineSection(5,-71.3,59.7,61.2);
 409   //
 410   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 411   //
 412   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 413   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 414   //
 415   // define reflection matrix
 416   //
 417   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,270.,180.,0.);
 418   //
 419   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 420   //
 421   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-72.1));
 422   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,72.1));
 423   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 424   //
 425   // central membrane - 2 rings and a mylar membrane - assembly
 426   //
 427   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 428   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 429   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 430   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 431   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 432   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 433   //
 434   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 435   cm->AddNode(ihv,1);
 436   cm->AddNode(ohv,1);
 437   cm->AddNode(memv,1);
 438   v9->AddNode(cm,1);
 439   //
 440   // end caps - they are make as an assembly of single segments
 441   // containing both readout chambers
 442   //
 443   Double_t OpeningAngle = 10.*TMath::DegToRad();
 444   Double_t thick=1.5; // rib
 445   Double_t shift = thick/TMath::Sin(OpeningAngle);
 446   //
 447   Double_t LowEdge = 86.3; // hole in the wheel
 448   Double_t UpEdge = 240.4; // hole in the wheel
 449   //
 450   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 451   //
 452   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 453   //
 454   hole->DefineSection(0,-3.5,LowEdge-shift,UpEdge-shift);
 455   hole->DefineSection(1,-1.5,LowEdge-shift,UpEdge-shift);
 456   //
 457   hole->DefineSection(2,-1.5,LowEdge-shift,UpEdge+3.-shift);
 458   hole->DefineSection(3,3.5,LowEdge-shift,UpEdge+3.-shift);
 459   //
 460   Double_t ys = shift*TMath::Sin(OpeningAngle);
 461   Double_t xs = shift*TMath::Cos(OpeningAngle);
 462   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 463   tr->RegisterYourself();
 464   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 465   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 466   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 467   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 468   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 469   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 470   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 471   //
 472   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 473   //
 474   // readout chambers
 475   //
 476   // IROC first
 477   //
 478    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 479    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 480   // empty space
 481    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 482    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 483    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 484    //bars
 485    Double_t tga = (19.8328-12.3742)/39.3;
 486    Double_t xmin,xmax;
 487    xmin = 9.55*tga+12.3742;
 488    xmax = 9.95*tga+12.3742;
 489    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 490    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 491    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 492    xmin=19.4*tga+12.3742;
 493    xmax=19.9*tga+12.3742;
 494    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 495    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 496    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 497    xmin=29.35*tga+12.3742;
 498    xmax=29.75*tga+12.3742;
 499    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 500    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 501    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 502    //
 503    // holes for connectors
 504    //
 505    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 506    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 507    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 508    fileName += "/TPC/conn_iroc.dat";
 509    ifstream in;
 510    in.open(fileName.Data(), ios_base::in); // asci file
 511    for(Int_t i =0;i<86;i++){
 512       Double_t y = 3.9;
 513       Double_t x,z,ang;
 514       in>>x>>z>>ang;
 515       TGeoRotation *rrr = new TGeoRotation();
 516       rrr->RotateY(ang);
 517       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 518       ibdv->AddNode(connv,i+1,trans);
 519    }
 520    in.close();
 521    // "cap"
 522    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 523    // "hole"
 524    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 525    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 526    tr1->RegisterYourself();
 527    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 528    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 529    //
 530    // pad plane and wire fixations
 531    //
 532    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 533    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 534    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 535    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 536    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 537    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 538    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 539    //
 540    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 541    //
 542    iroc->AddNode(ibdv,1);
 543    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 544    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 545    tga =(23.3521-14.5974)/49.65;
 546    Double_t xx = 24.825*tga+14.5974-0.6;
 547    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 548    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 549    //
 550    // OROC
 551    //
 552    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 553    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 554    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 555    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 556    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 557    //horizontal bars
 558    tga=(38.5084-20.2938)/99.3;
 559    xmin=tga*10.2+20.2938;
 560    xmax=tga*10.6+20.2938;
 561    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 562    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 563    //
 564    xmin=22.55*tga+20.2938;
 565    xmax=24.15*tga+20.2938;
 566    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 567    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 568    //
 569    xmin=36.1*tga+20.2938;
 570    xmax=36.5*tga+20.2938;
 571    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 572    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 573    //
 574    xmin=49.0*tga+20.2938;
 575    xmax=50.6*tga+20.2938;
 576    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 577    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 578    //
 579    xmin=63.6*tga+20.2938;
 580    xmax=64.0*tga+20.2938;
 581    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 582    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 583    //
 584    xmin=75.5*tga+20.2938;
 585    xmax=77.15*tga+20.2938;
 586    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 587    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 588    //
 589    xmin=88.7*tga+20.2938;
 590    xmax=89.1*tga+20.2938;
 591    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 592    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 593    //
 594    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 595    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 596    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 597    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 598    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 599    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 600    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 601    // vertical bars
 602    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 603    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 604    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 605    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 606    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 607    //
 608    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 609    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 610    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 611    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 612    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 613    //
 614    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 615    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 616    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 617    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 618    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 619    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 620    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 621    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 622    //
 623    // holes for connectors
 624    //
 625    fileName = gSystem->Getenv("ALICE_ROOT");
 626    fileName += "/TPC/conn_oroc.dat";
 627    in.open(fileName.Data(), ios_base::in); // asci file
 628    for(Int_t i =0;i<78;i++){
 629       Double_t y =3.89;
 630       Double_t x,z,ang;
 631       Double_t x1,z1,x2,z2;
 632       in>>x>>z>>ang;
 633       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 634       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 635       //
 636       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 637       //
 638       TGeoRotation *rr = new TGeoRotation();
 639       rr->RotateY(ang);
 640       z1-=54.95;
 641       z2-=54.95;
 642       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 643       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 644       obdv->AddNode(connv,i+1,trans1);
 645       obdv->AddNode(connv,i+79,trans2);
 646    }
 647    in.close();
 648    // cap
 649    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 650    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 651    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 652    tr5->RegisterYourself();
 653    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 654    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 655    //
 656    // pad plane and wire fixations
 657    //
 658    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 659    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 660    //
 661    tga=(43.5239-23.3874)/114.2;
 662    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 663    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 664    xx = 57.1*tga+23.3874-0.7;
 665    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 666    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 667    //
 668    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 669    //
 670    oroc->AddNode(obdv,1);
 671    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 672    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 673    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 674    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 675    //
 676    // now iroc and oroc are placed into a sector...
 677    //
 678    TGeoVolumeAssembly *sect = new TGeoVolumeAssembly("TPC_SECT");
 679    TGeoRotation rot1("rot1",90.,90.,0.);
 680    TGeoRotation rot2("rot2");
 681    rot2.RotateY(10.);
 682    TGeoRotation *rot = new TGeoRotation("rot");
 683    *rot=rot1*rot2;
 684    //
 685    Double_t x0,y0;
 686    x0=110.2*TMath::Cos(OpeningAngle);
 687    y0=110.2*TMath::Sin(OpeningAngle);
 688    TGeoCombiTrans *combi1 = new TGeoCombiTrans("combi1",x0,y0,1.09,rot);
 689    x0=188.45*TMath::Cos(OpeningAngle);
 690    y0=188.45*TMath::Sin(OpeningAngle);
 691    TGeoCombiTrans *combi2 = new TGeoCombiTrans("combi2",x0,y0,0.99,rot);
 692    //
 693    sect->AddNode(ch,1);
 694    sect->AddNode(iroc,1,combi1);
 695    sect->AddNode(oroc,1,combi2);
 696    //
 697    // segment is ready...
 698    // now I try to make a wheel...
 699    //
 700    TGeoVolumeAssembly *wheel = new TGeoVolumeAssembly("TPC_ENDCAP");
 701    //
 702    for(Int_t i =0;i<18;i++){
 703      Double_t phi = (20.*i);
 704      TGeoRotation *r = new TGeoRotation();
 705      r->RotateZ(phi);
 706      wheel->AddNode(sect,i+1,r);
 707
 708    }
 709    // wheels in the drift volume!
 710    v9->AddNode(wheel,1,new TGeoTranslation(0.,0.,-256.6));
 711    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 712    v9->AddNode(wheel,2,combi3);
 713
 714    //_____________________________________________________________
 715    // service support wheel
 716    //_____________________________________________________________
 717   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 718   sw->DefineSection(0,-4.,80.5,251.75);
 719   sw->DefineSection(1,4.,80.5,251.75);
 720   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 721   //
 722   thick=1.;
 723   shift = thick/TMath::Sin(OpeningAngle);
 724   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 725   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 726   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 727   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 728   //
 729   ys = shift*TMath::Sin(OpeningAngle);
 730   xs = shift*TMath::Cos(OpeningAngle);
 731   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 732   // cover
 733   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 734   co->DefineSection(0,-0.5,77.,255.25);
 735   co->DefineSection(1,0.5,77.,255.25);
 736   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 737   // hole in a cover
 738   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 739   shift=4./TMath::Sin(OpeningAngle);
 740   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 741   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 742   //
 743   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 744   //
 745   ys = shift*TMath::Sin(OpeningAngle);
 746   xs = shift*TMath::Cos(OpeningAngle);
 747   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 748   //
 749   // Sector as an Assembly
 750   //
 751   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 752   swhs->AddNode(swv,1);
 753   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 754   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 755   //
 756   // SSW as an Assembly of sectors
 757   //
 758  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 759    for(Int_t i =0;i<18;i++){
 760      Double_t phi = (20.*i);
 761      TGeoRotation *r = new TGeoRotation();
 762      r->RotateZ(phi);
 763      swheel->AddNode(swhs,i+1,r);
 764    }
 765    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 766    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 767
 768    // sensitive strips - strip "0" is always set
 769    // conditional
 770    Int_t totrows;
 771    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 772    Double_t *upar;
 773    upar=NULL;
 774    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 775    upar=new Double_t [10];
 776    upar[0]=0.;
 777    upar[1]=360.;
 778    upar[2]=18.;
 779    upar[3]=2.;
 780    //
 781    upar[4]=-124.8;
 782    upar[7]=124.8;
 783
 784    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 785
 786    upar[5]=rlow;
 787    upar[6]=rlow+.01;
 788    upar[8]=upar[5];
 789    upar[9]=upar[6];
 790    //
 791    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 792    gGeoManager->Node("TPC_Strip",totrows+1,
 793                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 794    //
 795    // now, strips optionally
 796    //
 797    if(fSens){
 798      //lower sectors
 799      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 800        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 801        upar[5]=rlow;
 802        upar[6]=rlow+.01;
 803        upar[8]=upar[5];
 804        upar[9]=upar[6];
 805        gGeoManager->Node("TPC_Strip",i,
 806                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 807        gGeoManager->Node("TPC_Strip",totrows+i,
 808                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 809      }
 810      //upper sectors
 811      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 812        rlow=fTPCParam->GetPadRowRadiiUp(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+fTPCParam->GetNRowLow(),
 818                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 819        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 820                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 821      }
 822    }//strips
 823   //----------------------------------------------------------
 824   // TPc Support Rods - MAKROLON
 825   //----------------------------------------------------------
 826   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 827   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 828   // upper and lower rods differ in length!
 829   delete [] upar;
 830   upar=NULL;
 831   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 832   upar=new Double_t [3];
 833   upar[0]=1.8;
 834   upar[1]=2.2;
 835
 836   //
 837   //HV rods - makrolon + 0.58cm (diameter) Cu
 838   TGeoTube *hvr = new TGeoTube(0.,4.4,126.64);
 839   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 840   //
 841   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 842   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 843   hvrv->AddNode(hvcv,1);
 844
 845   for(Int_t i=0;i<17;i++){
 846     Double_t angle,x,y;
 847     Double_t z,r;
 848     angle=TMath::DegToRad()*20.*(Double_t)i;
 849     r=81.5;
 850     x=r * TMath::Cos(angle);
 851     y=r * TMath::Sin(angle);
 852     upar[2]=126.64; //lower
 853     z= 126.96;
 854     if(i==15){
 855       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 856       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 857     }
 858     else{
 859      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 860      gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 861     }
 862     r=254.25;
 863     x=r * TMath::Cos(angle);
 864     y=r * TMath::Sin(angle);
 865     upar[2]=126.54; //upper
 866     z=127.06;
 867     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 868     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 869   }
 870
 871
 872   gMC->Gspos("TPC_M ",1,"ALIC",0.,0.,0.,0,"ONLY");
 873
 874 } // end of function
 875
 876 //_____________________________________________________________________________
 877 void AliTPCv2::DrawDetector()
 878 {
 879   //
 880   // Draw a shaded view of the Time Projection Chamber version 1
 881   //
 882
 883   // Set everything unseen
 884   gMC->Gsatt("*", "seen", -1);
 885   //
 886   // Set ALIC mother transparent
 887   gMC->Gsatt("ALIC","SEEN",0);
 888   //
 889   // Set the volumes visible
 890   //
 891
 892   gMC->Gsatt("TPC ","SEEN",0);
 893   gMC->Gsatt("TOIN","SEEN",1);
 894   gMC->Gsatt("TOIN","COLO",7);
 895   gMC->Gsatt("TOCV","SEEN",1);
 896   gMC->Gsatt("TOCV","COLO",4);
 897   gMC->Gsatt("TSA1","SEEN",0);
 898   gMC->Gsatt("TSA2","SEEN",0);
 899   gMC->Gsatt("TSA3","SEEN",0);
 900   gMC->Gsatt("TSA4","SEEN",0);
 901   gMC->Gsatt("TSA5","SEEN",0);
 902   gMC->Gsatt("TOFC","SEEN",1);
 903   gMC->Gsatt("TOFC","COLO",4);
 904   gMC->Gsatt("TSA6","SEEN",0);
 905   gMC->Gsatt("TSA7","SEEN",0);
 906   gMC->Gsatt("TSA8","SEEN",0);
 907   gMC->Gsatt("TIIN","SEEN",1);
 908   gMC->Gsatt("TIIN","COLO",7);
 909   gMC->Gsatt("TII1","SEEN",0);
 910   gMC->Gsatt("TIFC","SEEN",1);
 911   gMC->Gsatt("TIFC","COLO",4);
 912   gMC->Gsatt("TSA9","SEEN",0);
 913   gMC->Gsatt("TS10","SEEN",0);
 914   gMC->Gsatt("TS11","SEEN",0);
 915   gMC->Gsatt("TS12","SEEN",0);
 916   gMC->Gsatt("TS13","SEEN",0);
 917   gMC->Gsatt("TS14","SEEN",0);
 918   gMC->Gsatt("TICC","SEEN",0);
 919   gMC->Gsatt("TICM","SEEN",0);
 920   gMC->Gsatt("TS15","SEEN",0);
 921   gMC->Gsatt("TS16","SEEN",0);
 922   gMC->Gsatt("TS17","SEEN",0);
 923   gMC->Gsatt("TS18","SEEN",0);
 924   gMC->Gsatt("TS19","SEEN",0);
 925   gMC->Gsatt("TPJ1","SEEN",0);
 926   gMC->Gsatt("TPJ2","SEEN",0);
 927   gMC->Gsatt("TICS","SEEN",0);
 928   gMC->Gsatt("TDGN","SEEN",0);
 929   gMC->Gsatt("TIRC","SEEN",0);
 930   gMC->Gsatt("TIC1","SEEN",1);
 931   gMC->Gsatt("TIPP","SEEN",0);
 932   gMC->Gsatt("TIC3","SEEN",0);
 933   gMC->Gsatt("TRCE","SEEN",0);
 934   gMC->Gsatt("TPSC","SEEN",0);
 935   gMC->Gsatt("TPCC","SEEN",0);
 936   gMC->Gsatt("TORC","SEEN",0);
 937   gMC->Gsatt("TOPP","SEEN",0);
 938   gMC->Gsatt("TOC3","SEEN",0);
 939   gMC->Gsatt("TOC1","SEEN",1);
 940   gMC->Gsatt("TSSW","SEEN",1);
 941   gMC->Gsatt("TSWC","SEEN",1);
 942   gMC->Gsatt("TSSW","COLO",3);
 943   gMC->Gsatt("TSWC","COLO",3);
 944   gMC->Gsatt("TSCE","COLO",6);
 945   gMC->Gsatt("TSCE","SEEN",1);
 946   gMC->Gsatt("TWES","SEEN",0);
 947   gMC->Gsatt("TSWB","SEEN",0);
 948   gMC->Gsatt("TPEL","SEEN",0);
 949   gMC->Gsatt("TPMW","SEEN",1);
 950   gMC->Gsatt("TESR","SEEN",1);
 951   gMC->Gsatt("TPMW","COLO",12);
 952   gMC->Gsatt("TIC1","COLO",5);
 953   gMC->Gsatt("TOC1","COLO",5);
 954   gMC->Gsatt("TESB","SEEN",0);
 955   gMC->Gsatt("THVM","SEEN",1);
 956   gMC->Gsatt("THVM","COLO",11);
 957   gMC->Gsatt("THVH","SEEN",0);
 958   gMC->Gsatt("TPSR","SEEN",0);
 959   gMC->Gsatt("THVL","SEEN",0);
 960   gMC->Gsatt("THVC","SEEN",0);
 961   gMC->Gsatt("THVE","SEEN",0);
 962   gMC->Gsatt("THVR","SEEN",0);
 963   gMC->Gsatt("TPSS","SEEN",0);
 964   gMC->Gsatt("TPUS","SEEN",0);
 965   gMC->Gsatt("TPLS","SEEN",0);
 966
 967   //
 968   gMC->Gdopt("hide", "on");
 969   gMC->Gdopt("shad", "on");
 970   gMC->Gsatt("*", "fill", 7);
 971   gMC->SetClipBox(".");
 972   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
 973   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
 974   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
 975   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
 976   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
 977   gMC->DefaultRange();
 978   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
 979   gMC->Gdhead(1111, "Time Projection Chamber");
 980   gMC->Gdman(18, 4, "MAN");
 981   gMC->Gdopt("hide","off");
 982 }
 983
 984 //_____________________________________________________________________________
 985 void AliTPCv2::CreateMaterials()
 986 {
 987   //
 988   // Define materials for version 2 of the Time Projection Chamber
 989   //
 990
 991   AliTPC::CreateMaterials();
 992 }
 993
 994 //_____________________________________________________________________________
 995 void AliTPCv2::Init()
 996 {
 997   //
 998   // Initialises version 2 of the TPC after that it has been built
 999   //
1000
1001   Int_t *idtmed = fIdtmed->GetArray();
1002
1003   AliTPC::Init();
1004
1005
1006   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1007
1008   fIDrift=gMC->VolId("TPC_Drift");
1009   fSecOld=-100; // fake number
1010
1011   gMC->SetMaxNStep(30000); // max. number of steps increased
1012
1013   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1014
1015   AliInfo("*** TPC version 2 initialized ***");
1016   AliInfo(Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1017
1018   //
1019
1020 }
1021
1022 //_____________________________________________________________________________
1023 void AliTPCv2::StepManager()
1024 {
1025   //
1026   // Called for every step in the Time Projection Chamber
1027   //
1028
1029   //
1030   // parameters used for the energy loss calculations
1031   //
1032   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1033   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1034   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1035
1036
1037   const Float_t kbig = 1.e10;
1038
1039   Int_t id,copy;
1040   Float_t hits[5];
1041   Int_t vol[2];
1042   TLorentzVector p;
1043
1044   vol[1]=0; // preset row number to 0
1045   //
1046   gMC->SetMaxStep(kbig);
1047
1048   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1049
1050   Float_t charge = gMC->TrackCharge();
1051
1052   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1053
1054   // check the sensitive volume
1055
1056   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1057   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1058
1059   gMC->TrackPosition(p);
1060   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1061   //
1062
1063   //
1064   Double_t angle = TMath::ACos(p[0]/r);
1065   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1066   //
1067   // angular segment, it is not a real sector number...
1068   //
1069   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1070                fTPCParam->GetInnerAngle());
1071   // rotate to segment "0"
1072   Float_t cos,sin;
1073   fTPCParam->AdjustCosSin(sector,cos,sin);
1074   Float_t x1=p[0]*cos + p[1]*sin;
1075   // check if within sector's limits
1076   if(x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp()
1077      ||x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp()){
1078   // calculate real sector number...
1079   if (x1>fTPCParam->GetOuterRadiusLow()){
1080     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1081              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1082     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1083   }
1084     else
1085       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1086   //
1087   // here I have a sector number
1088   //
1089
1090   vol[0]=sector;
1091   // check if change of sector
1092   if(sector != fSecOld){
1093     fSecOld=sector;
1094     // add track reference
1095     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
1096   }
1097   // track is in the sensitive strip
1098   if(id == fIdSens){
1099     // track is entering the strip
1100     if (gMC->IsTrackEntering()){
1101       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1102       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1103       // row numbers are autonomous for lower and upper sectors
1104       if(vol[0] > fTPCParam->GetNInnerSector()) {
1105         vol[1] -= fTPCParam->GetNRowLow();
1106       }
1107     //
1108       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1109
1110         // lower sector, row 0, because Jouri wants to have this
1111
1112         gMC->TrackMomentum(p);
1113         hits[0]=p[0];
1114         hits[1]=p[1];
1115         hits[2]=p[2];
1116         hits[3]=0.; // this hit has no energy loss
1117         // Get also the track time for pileup simulation
1118         hits[4]=gMC->TrackTime();
1119
1120         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1121       }
1122     //
1123
1124        gMC->TrackPosition(p);
1125        hits[0]=p[0];
1126        hits[1]=p[1];
1127        hits[2]=p[2];
1128        hits[3]=0.; // this hit has no energy loss
1129        // Get also the track time for pileup simulation
1130        hits[4]=gMC->TrackTime();
1131
1132        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1133
1134     }
1135     else return;
1136   }
1137   //-----------------------------------------------------------------
1138   //  charged particle is in the sensitive drift volume
1139   //-----------------------------------------------------------------
1140   if(gMC->TrackStep() > 0) {
1141
1142     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1143     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1144     //
1145     gMC->TrackPosition(p);
1146     hits[0]=p[0];
1147     hits[1]=p[1];
1148     hits[2]=p[2];
1149     hits[3]=(Float_t)nel;
1150
1151     // Add this hit
1152
1153     if (fHitType&&2){
1154       gMC->TrackMomentum(p);
1155       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1156       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1157       fTrackHits->SetHitPrecision(precision);
1158     }
1159
1160     // Get also the track time for pileup simulation
1161     hits[4]=gMC->TrackTime();
1162
1163     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1164
1165   } // step>0
1166   } //within sector's limits
1167   // Stemax calculation for the next step
1168
1169   Float_t pp;
1170   TLorentzVector mom;
1171   gMC->TrackMomentum(mom);
1172   Float_t ptot=mom.Rho();
1173   Float_t betaGamma = ptot/gMC->TrackMass();
1174
1175   Int_t pid=gMC->TrackPid();
1176   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1177     {
1178       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1179     }
1180   else
1181     {
1182
1183       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1184       pp=kprim*BetheBloch(betaGamma);
1185
1186       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1187     }
1188
1189   Double_t rnd = gMC->GetRandom()->Rndm();
1190
1191   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1192
1193
1194 }
1195
1196 //_____________________________________________________________________________
1197 Float_t AliTPCv2::BetheBloch(Float_t bg)
1198 {
1199   //
1200   // Bethe-Bloch energy loss formula
1201   //
1202   const Double_t kp1=0.76176e-1;
1203   const Double_t kp2=10.632;
1204   const Double_t kp3=0.13279e-4;
1205   const Double_t kp4=1.8631;
1206   const Double_t kp5=1.9479;
1207
1208   Double_t dbg = (Double_t) bg;
1209
1210   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1211
1212   Double_t aa = TMath::Power(beta,kp4);
1213   Double_t bb = TMath::Power(1./dbg,kp5);
1214
1215   bb=TMath::Log(kp3+bb);
1216
1217   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1218 }
1219
1220