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 "AliTPCParam.h"
  39 #include "AliTPCTrackHitsV2.h"
  40 #include "AliTPCv2.h"
  41 #include "TGeoVolume.h"
  42 #include "TGeoPcon.h"
  43 #include "TGeoTube.h"
  44 #include "TGeoPgon.h"
  45 #include "TGeoTrd1.h"
  46 #include "TGeoCompositeShape.h"
  47 #include "TGeoPara.h"
  48 ClassImp(AliTPCv2)
  49
  50 //_____________________________________________________________________________
  51 AliTPCv2::AliTPCv2(const char *name, const char *title) :
  52   AliTPC(name, title),
  53   fIdSens(0),
  54   fIDrift(0),
  55   fSecOld(0)
  56 {
  57   //
  58   // Standard constructor for Time Projection Chamber version 2
  59   //
  60
  61
  62   SetBufferSize(128000);
  63
  64
  65   if (fTPCParam)
  66      fTPCParam->Write(fTPCParam->GetTitle());
  67 }
  68
  69 //_____________________________________________________________________________
  70 void AliTPCv2::CreateGeometry()
  71 {
  72   //
  73   // Create the geometry of Time Projection Chamber version 2
  74   //
  75   //Begin_Html
  76   /*
  77     <img src="picts/AliTPC.gif">
  78   */
  79   //End_Html
  80   //Begin_Html
  81   /*
  82     <img src="picts/AliTPCv2Tree.gif">
  83   */
  84   //End_Html
  85
  86   //----------------------------------------------------------
  87   // This geometry is written using TGeo class
  88   // Firstly the shapes are defined, and only then the volumes
  89   // What is recognized by the MC are volumes
  90   //----------------------------------------------------------
  91   //
  92   //  tpc - this will be the mother volume
  93   //
  94
  95   //
  96   // here I define a volume TPC
  97   // retrive the medium name with "TPC_" as a leading string
  98   //
  99   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 100   tpc->DefineSection(0,-290.,77.,278.);
 101   tpc->DefineSection(1,-259.6,70.,278.);
 102   //
 103   tpc->DefineSection(2,-259.6,68.1,278.);
 104   tpc->DefineSection(3,-253.6,68.1,278.);
 105   //
 106   tpc->DefineSection(4,-253.6,68.,278.);
 107   tpc->DefineSection(5,-74.0,60.8,278.);
 108   //
 109   tpc->DefineSection(6,-74.0,60.1,278.);
 110   tpc->DefineSection(7,-73.3,60.1,278.);
 111   //
 112   tpc->DefineSection(8,-73.3,56.9,278.);
 113   tpc->DefineSection(9,73.3,56.9,278.);
 114   //
 115   tpc->DefineSection(10,73.3,60.1,278.);
 116   tpc->DefineSection(11,74.0,60.1,278.);
 117   //
 118   tpc->DefineSection(12,74.0,60.8,278.);
 119   tpc->DefineSection(13,253.6,65.5,278.);
 120   //
 121   tpc->DefineSection(14,253.6,65.6,278.);
 122   tpc->DefineSection(15,259.6,65.6,278.);
 123   //
 124   tpc->DefineSection(16,259.6,70.0,278.);
 125   tpc->DefineSection(17,290.,77.,278.);
 126   //
 127   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 128   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 129   //
 130   // drift volume - sensitive volume, extended beyond the
 131   // endcaps, because of the alignment
 132   //
 133   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 134   dvol->DefineSection(0,-260.,74.5,264.4);
 135   dvol->DefineSection(1,-253.6,74.5,264.4);
 136   //
 137   dvol->DefineSection(2,-253.6,76.6774,258.);
 138   dvol->DefineSection(3,253.6,76.6774,258.);
 139   //
 140   dvol->DefineSection(4,253.6,74.5,264.4);
 141   dvol->DefineSection(5,260.,74.5,264.4);
 142   //
 143   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
 144   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 145   //
 146   v1->AddNode(v9,1);
 147   //
 148   // outer insulator
 149   //
 150   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 151   //
 152   tpco->DefineSection(0,-256.6,264.8,278.);
 153   tpco->DefineSection(1,-253.6,264.8,278.);
 154   //
 155   tpco->DefineSection(2,-253.6,258.,278.);
 156   tpco->DefineSection(3,250.6,258.,278.);
 157   //
 158   tpco->DefineSection(4,250.6,258.,275.5);
 159   tpco->DefineSection(5,253.6,258.,275.5);
 160   //
 161   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 162   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 163   //
 164   // outer containment vessel
 165   //
 166   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 167   //
 168   tocv->DefineSection(0,-256.6,264.8,278.);
 169   tocv->DefineSection(1,-253.6,264.8,278.);
 170   //
 171   tocv->DefineSection(2,-253.6,274.8124,278.);
 172   tocv->DefineSection(3,247.6,274.8124,278.);
 173   //
 174   tocv->DefineSection(4,247.6,270.4,278.);
 175   tocv->DefineSection(5,250.6,270.4,278.);
 176   //
 177   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 178   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 179   //
 180   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 181   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 182   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 183   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 184   //
 185   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 186   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 187   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 188   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 189   //
 190   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 191   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 192   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 193   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 194  //-------------------------------------------------------
 195   //  Tpc Outer Field Cage
 196   //  daughters - composite (sandwich)
 197   //-------------------------------------------------------
 198
 199   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 200   //
 201   tofc->DefineSection(0,-253.6,258.,269.6);
 202   tofc->DefineSection(1,-250.6,258.,269.6);
 203   //
 204   tofc->DefineSection(2,-250.6,258.,260.0676);
 205   tofc->DefineSection(3,250.6,258.,260.0676);
 206   //
 207   tofc->DefineSection(4,250.6,258.,275.5);
 208   tofc->DefineSection(5,253.6,258.,275.5);
 209   //
 210   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 211   //sandwich
 212   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 213   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 214   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 215   //
 216   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 217   //
 218   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 219   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 220   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 221   //
 222   // outer part - positioning
 223   //
 224   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 225   //
 226   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 227   //
 228   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 229   //
 230   v2->AddNode(v3,1); v2->AddNode(v4,1);
 231   //
 232   v1->AddNode(v2,1);
 233   //--------------------------------------------------------------------
 234   // Tpc Inner INsulator (CO2)
 235   // the cones, the central drum and the inner f.c. sandwich with a piece
 236   // of the flane will be placed in the TPC
 237   //--------------------------------------------------------------------
 238   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 239   //
 240   tpci->DefineSection(0,-253.6,68.4,76.6774);
 241   tpci->DefineSection(1,-74.0,61.2,76.6774);
 242   //
 243   tpci->DefineSection(2,74.0,61.2,76.6774);
 244   //
 245   tpci->DefineSection(3,253.6,65.9,76.6774);
 246   //
 247   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 248   //
 249   // now the inner field cage - only part of flanges (2 copies)
 250   //
 251   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 252   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 253   //
 254  //---------------------------------------------------------
 255   // Tpc Inner Containment vessel - Muon side
 256   //---------------------------------------------------------
 257   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 258   //
 259   tcms->DefineSection(0,-259.1,68.1,74.2);
 260   tcms->DefineSection(1,-253.6,68.1,74.2);
 261   //
 262   tcms->DefineSection(2,-253.6,68.1,68.4);
 263   tcms->DefineSection(3,-74.0,60.9,61.2);
 264   //
 265   tcms->DefineSection(4,-74.0,60.1,61.2);
 266   tcms->DefineSection(5,-73.3,60.1,61.2);
 267   //
 268   tcms->DefineSection(6,-73.3,56.9,61.2);
 269   tcms->DefineSection(7,-73.0,56.9,61.2);
 270   //
 271   tcms->DefineSection(8,-73.0,56.9,58.8);
 272   tcms->DefineSection(9,-71.3,56.9,58.8);
 273   //
 274   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 275   //-----------------------------------------------
 276   // inner containment vessel - shaft side
 277   //-----------------------------------------------
 278   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 279   //
 280   tcss->DefineSection(0,71.3,56.9,58.8);
 281   tcss->DefineSection(1,73.0,56.9,58.8);
 282   //
 283   tcss->DefineSection(2,73.0,56.9,61.2);
 284   tcss->DefineSection(3,73.3,56.9,61.2);
 285   //
 286   tcss->DefineSection(4,73.3,60.1,61.2);
 287   tcss->DefineSection(5,74.0,60.1,61.2);
 288   //
 289   tcss->DefineSection(6,74.0,60.9,61.2);
 290   tcss->DefineSection(7,253.6,65.6,65.9);
 291   //
 292   tcss->DefineSection(8,253.6,65.6,74.2);
 293   tcss->DefineSection(9,258.1,65.6,74.2);
 294   //
 295   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 296   //-----------------------------------------------
 297   //  Inner field cage
 298   //  define 4 parts and make an assembly
 299   //-----------------------------------------------
 300   // part1 - Al - 2 copies
 301   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 302   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 303   // sandwich - outermost parts - 2 copies
 304   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 305   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 306   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 307   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 308   //
 309   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 310   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 311   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 312   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 313   //
 314   // middle parts - 2 copies
 315   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 316   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 317   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 318   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 319   //
 320   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 321   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 322   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 323   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 324   // central part - 1 copy
 325   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 326   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 327   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 328   //
 329   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 330   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 331   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 332   //
 333   // inner part - positioning
 334   //
 335   // creating a sandwich
 336   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 337   //
 338   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 339   //
 340   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 341   //
 342   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 343   //
 344   tv100->AddNode(tv10,1);
 345   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 346   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 347   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 348   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 349   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 350   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 351   //
 352   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 353   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 354   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 355   v9->AddNode(tv100,1);
 356   //
 357   // central drum
 358   //
 359   // flange + sandwich
 360   //
 361   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 362   cfl->DefineSection(0,-71.1,59.7,61.2);
 363   cfl->DefineSection(1,-68.6,59.7,61.2);
 364   //
 365   cfl->DefineSection(2,-68.6,60.6324,61.2);
 366   cfl->DefineSection(3,68.6,60.6324,61.2);
 367   //
 368   cfl->DefineSection(4,68.6,59.7,61.2);
 369   cfl->DefineSection(5,71.1,59.7,61.2);
 370   //
 371   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 372   // sandwich
 373   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 374   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 375   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 376   //
 377   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 378   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 379   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 380   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 381   //
 382   // seals for central drum 2 copies
 383   //
 384   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 385   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 386   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 387   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 388   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 389   //
 390   // seal collars
 391   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 392   se->DefineSection(0,-72.8,59.7,61.2);
 393   se->DefineSection(1,-72.3,59.7,61.2);
 394   //
 395   se->DefineSection(2,-72.3,58.85,61.2);
 396   se->DefineSection(3,-71.6,58.85,61.2);
 397   //
 398   se->DefineSection(4,-71.6,59.7,61.2);
 399   se->DefineSection(5,-71.3,59.7,61.2);
 400   //
 401   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 402   //
 403   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 404   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 405   //
 406   // define reflection matrix
 407   //
 408   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 409   //
 410   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 411   //
 412   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 413   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 414   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 415   //
 416   // central membrane - 2 rings and a mylar membrane - assembly
 417   //
 418   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 419   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 420   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 421   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 422   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 423   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 424   //
 425   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 426   cm->AddNode(ihv,1);
 427   cm->AddNode(ohv,1);
 428   cm->AddNode(memv,1);
 429   v9->AddNode(cm,1);
 430   //
 431   // end caps - they are make as an assembly of single segments
 432   // containing both readout chambers
 433   //
 434   Double_t openingAngle = 10.*TMath::DegToRad();
 435   Double_t thick=1.5; // rib
 436   Double_t shift = thick/TMath::Sin(openingAngle);
 437   //
 438   Double_t lowEdge = 86.3; // hole in the wheel
 439   Double_t upEdge = 240.4; // hole in the wheel
 440   //
 441   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 442   //
 443   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 444   //
 445   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 446   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 447   //
 448   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 449   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 450   //
 451   Double_t ys = shift*TMath::Sin(openingAngle);
 452   Double_t xs = shift*TMath::Cos(openingAngle);
 453   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 454   tr->RegisterYourself();
 455   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 456   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 457   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 458   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 459   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 460   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 461   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 462   //
 463   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 464   //
 465   // readout chambers
 466   //
 467   // IROC first
 468   //
 469    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 470    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 471   // empty space
 472    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 473    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 474    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 475    //bars
 476    Double_t tga = (19.8328-12.3742)/39.3;
 477    Double_t xmin,xmax;
 478    xmin = 9.55*tga+12.3742;
 479    xmax = 9.95*tga+12.3742;
 480    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 481    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 482    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 483    xmin=19.4*tga+12.3742;
 484    xmax=19.9*tga+12.3742;
 485    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 486    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 487    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 488    xmin=29.35*tga+12.3742;
 489    xmax=29.75*tga+12.3742;
 490    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 491    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 492    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 493    //
 494    // holes for connectors
 495    //
 496    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 497    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 498    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 499    fileName += "/TPC/conn_iroc.dat";
 500    ifstream in;
 501    in.open(fileName.Data(), ios_base::in); // asci file
 502    for(Int_t i =0;i<86;i++){
 503       Double_t y = 3.99;
 504       Double_t x,z,ang;
 505       in>>x>>z>>ang;
 506       z-=26.5;
 507       TGeoRotation *rrr = new TGeoRotation();
 508       rrr->RotateY(ang);
 509       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
 510       ibdv->AddNode(connv,i+1,trans);
 511    }
 512    in.close();
 513    // "cap"
 514    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
 515    // "hole"
 516    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
 517    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);
 518    tr1->RegisterYourself();
 519    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
 520    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
 521    //
 522    // pad plane and wire fixations
 523    //
 524    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
 525    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
 526    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
 527    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
 528    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
 529    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
 530    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
 531    //
 532    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
 533    //
 534    iroc->AddNode(ibdv,1);
 535    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
 536    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
 537    tga =(23.3521-14.5974)/49.65;
 538    Double_t xx = 24.825*tga+14.5974-0.6;
 539    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
 540    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
 541    //
 542    // OROC
 543    //
 544    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
 545    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
 546    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
 547    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
 548    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
 549    //horizontal bars
 550    tga=(38.5084-20.2938)/99.3;
 551    xmin=tga*10.2+20.2938;
 552    xmax=tga*10.6+20.2938;
 553    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 554    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
 555    //
 556    xmin=22.55*tga+20.2938;
 557    xmax=24.15*tga+20.2938;
 558    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 559    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
 560    //
 561    xmin=36.1*tga+20.2938;
 562    xmax=36.5*tga+20.2938;
 563    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 564    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
 565    //
 566    xmin=49.0*tga+20.2938;
 567    xmax=50.6*tga+20.2938;
 568    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 569    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
 570    //
 571    xmin=63.6*tga+20.2938;
 572    xmax=64.0*tga+20.2938;
 573    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 574    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
 575    //
 576    xmin=75.5*tga+20.2938;
 577    xmax=77.15*tga+20.2938;
 578    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
 579    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
 580    //
 581    xmin=88.7*tga+20.2938;
 582    xmax=89.1*tga+20.2938;
 583    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
 584    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
 585    //
 586    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
 587    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
 588    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
 589    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
 590    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
 591    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
 592    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
 593    // vertical bars
 594    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1);
 595    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
 596    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
 597    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
 598    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
 599    //
 600    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
 601    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
 602    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
 603    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
 604    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
 605    //
 606    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
 607    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
 608    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
 609    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
 610    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
 611    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
 612    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
 613    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
 614    //
 615    // holes for connectors
 616    //
 617    fileName = gSystem->Getenv("ALICE_ROOT");
 618    fileName += "/TPC/conn_oroc.dat";
 619    in.open(fileName.Data(), ios_base::in); // asci file
 620    for(Int_t i =0;i<78;i++){
 621       Double_t y =3.89;
 622       Double_t x,z,ang;
 623       Double_t x1,z1,x2,z2;
 624       in>>x>>z>>ang;
 625       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
 626       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
 627       //
 628       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;
 629       //
 630       TGeoRotation *rr = new TGeoRotation();
 631       rr->RotateY(ang);
 632       z1-=54.95;
 633       z2-=54.95;
 634       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
 635       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
 636       obdv->AddNode(connv,i+1,trans1);
 637       obdv->AddNode(connv,i+79,trans2);
 638    }
 639    in.close();
 640    // cap
 641    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
 642    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
 643    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
 644    tr5->RegisterYourself();
 645    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
 646    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
 647    //
 648    // pad plane and wire fixations
 649    //
 650    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
 651    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
 652    //
 653    tga=(43.5239-23.3874)/114.2;
 654    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
 655    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);
 656    xx = 57.1*tga+23.3874-0.7;
 657    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
 658    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
 659    //
 660    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
 661    //
 662    oroc->AddNode(obdv,1);
 663    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
 664    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
 665    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
 666    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
 667    //
 668    // now iroc and oroc are placed into a sector...
 669    //
 670    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 671    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 672    TGeoRotation rot1("rot1",90.,90.,0.);
 673    TGeoRotation rot2("rot2");
 674    rot2.RotateY(10.);
 675    TGeoRotation *rot = new TGeoRotation("rot");
 676    *rot=rot1*rot2;
 677    //
 678    Double_t x0,y0;
 679    x0=110.2*TMath::Cos(openingAngle);
 680    y0=110.2*TMath::Sin(openingAngle);
 681    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //a-side
 682    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //c-side
 683    x0=188.45*TMath::Cos(openingAngle);
 684    y0=188.45*TMath::Sin(openingAngle);
 685    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //a-side
 686    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //c-side
 687    //
 688    //
 689    // A-side
 690    //
 691    secta->AddNode(ch,1);
 692    secta->AddNode(iroc,1,combi1a);
 693    secta->AddNode(oroc,1,combi2a);
 694    //
 695    // C-side
 696    //
 697    sectc->AddNode(ch,1);
 698    sectc->AddNode(iroc,1,combi1c);
 699    sectc->AddNode(oroc,1,combi2c);
 700    //
 701    // now I try to make  wheels...
 702    //
 703    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 704    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 705    //
 706    for(Int_t i =0;i<18;i++){
 707      Double_t phi = (20.*i);
 708      TGeoRotation *r = new TGeoRotation();
 709      r->RotateZ(phi);
 710      wheela->AddNode(secta,i+1,r);
 711      wheelc->AddNode(sectc,i+1,r);
 712
 713    }
 714    // wheels in the drift volume!
 715
 716    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 717    v9->AddNode(wheela,1,combi3);
 718    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 719    //_____________________________________________________________
 720    // service support wheel
 721    //_____________________________________________________________
 722   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 723   sw->DefineSection(0,-4.,80.5,251.75);
 724   sw->DefineSection(1,4.,80.5,251.75);
 725   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 726   //
 727   thick=1.;
 728   shift = thick/TMath::Sin(openingAngle);
 729   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 730   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 731   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 732   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 733   //
 734   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 735   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 736   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 737   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 738   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 739   //
 740   shv->AddNode(elv,1);
 741   //
 742   //
 743   ys = shift*TMath::Sin(openingAngle);
 744   xs = shift*TMath::Cos(openingAngle);
 745   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 746   // cover
 747   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 748   co->DefineSection(0,-0.5,77.,255.25);
 749   co->DefineSection(1,0.5,77.,255.25);
 750   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 751   // hole in a cover
 752   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 753   shift=4./TMath::Sin(openingAngle);
 754   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 755   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 756   //
 757   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 758   //
 759   ys = shift*TMath::Sin(openingAngle);
 760   xs = shift*TMath::Cos(openingAngle);
 761   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 762   //
 763   // Sector as an Assembly
 764   //
 765   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 766   swhs->AddNode(swv,1);
 767   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 768   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 769   //
 770   // SSW as an Assembly of sectors
 771   //
 772  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 773    for(Int_t i =0;i<18;i++){
 774      Double_t phi = (20.*i);
 775      TGeoRotation *r = new TGeoRotation();
 776      r->RotateZ(phi);
 777      swheel->AddNode(swhs,i+1,r);
 778    }
 779    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 780    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 781
 782    // sensitive strips - strip "0" is always set
 783    // conditional
 784    Int_t totrows;
 785    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 786    Double_t *upar;
 787    upar=NULL;
 788    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 789    upar=new Double_t [10];
 790    upar[0]=0.;
 791    upar[1]=360.;
 792    upar[2]=18.;
 793    upar[3]=2.;
 794    //
 795    upar[4]=-124.8;
 796    upar[7]=124.8;
 797
 798    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 799
 800    upar[5]=rlow;
 801    upar[6]=rlow+.01;
 802    upar[8]=upar[5];
 803    upar[9]=upar[6];
 804    //
 805    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 806    gGeoManager->Node("TPC_Strip",totrows+1,
 807                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 808    //
 809    // now, strips optionally
 810    //
 811    if(fSens){
 812      //lower sectors
 813      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 814        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 815        upar[5]=rlow;
 816        upar[6]=rlow+.01;
 817        upar[8]=upar[5];
 818        upar[9]=upar[6];
 819        gGeoManager->Node("TPC_Strip",i,
 820                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 821        gGeoManager->Node("TPC_Strip",totrows+i,
 822                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 823      }
 824      //upper sectors
 825      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 826        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 827        upar[5]=rlow;
 828        upar[6]=rlow+.01;
 829        upar[8]=upar[5];
 830        upar[9]=upar[6];
 831        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 832                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 833        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 834                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 835      }
 836    }//strips
 837   //----------------------------------------------------------
 838   // TPc Support Rods - MAKROLON
 839   //----------------------------------------------------------
 840   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 841   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 842   // upper and lower rods differ in length!
 843   delete [] upar;
 844   upar=NULL;
 845   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 846   upar=new Double_t [3];
 847   upar[0]=1.8;
 848   upar[1]=2.2;
 849
 850   //
 851   //HV rods - makrolon + 0.58cm (diameter) Cu
 852   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 853   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 854   //
 855   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 856   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 857   hvrv->AddNode(hvcv,1);
 858
 859   for(Int_t i=0;i<18;i++){
 860     Double_t angle,x,y;
 861     Double_t z,r;
 862     angle=TMath::DegToRad()*20.*(Double_t)i;
 863     r=81.5;
 864     x=r * TMath::Cos(angle);
 865     y=r * TMath::Sin(angle);
 866     upar[2]=126.64; //lower
 867     z= 126.96;
 868     if(i==15){
 869       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 870       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 871     }
 872     else{
 873      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 874      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 875     }
 876     r=254.25;
 877     x=r * TMath::Cos(angle);
 878     y=r * TMath::Sin(angle);
 879     upar[2]=126.54; //upper
 880     z=127.06;
 881     gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 882     gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 883   }
 884
 885   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 886   alice->AddNode(v1,1);
 887
 888 } // end of function
 889
 890 //_____________________________________________________________________________
 891 void AliTPCv2::AddAlignableVolumes() const
 892 {
 893   //
 894   // Create entries for alignable volumes associating the symbolic volume
 895   // name with the corresponding volume path. Needs to be syncronized with
 896   // eventual changes in the geometry.
 897   //
 898   SetInnerChambersAlignable();
 899   SetOuterChambersAlignable();
 900 }
 901
 902 //_____________________________________________________________________________
 903 void AliTPCv2::SetInnerChambersAlignable() const
 904 {
 905   //
 906   Int_t modnum = 0;
 907   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 908   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 909   TString vpappend = "/TPC_IROC_1";
 910   TString snstr1="TPC/EndcapA/Sector";
 911   TString snstr2="TPC/EndcapC/Sector";
 912   TString snappend="/InnerChamber";
 913   TString volpath, symname;
 914
 915     for(Int_t cnt=1; cnt<=18; cnt++){
 916       volpath = vpstr1;
 917       volpath += cnt;
 918       volpath += vpappend;
 919       symname = snstr1;
 920       symname += cnt;
 921       symname += snappend;
 922     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 923       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 924       modnum++;
 925     }
 926
 927   for(Int_t cnt=1; cnt<=18; cnt++){
 928     volpath = vpstr2;
 929     volpath += cnt;
 930     volpath += vpappend;
 931     symname = snstr2;
 932     symname += cnt;
 933     symname += snappend;
 934     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 935       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 936     modnum++;
 937   }
 938 }
 939
 940 //_____________________________________________________________________________
 941 void AliTPCv2::SetOuterChambersAlignable() const
 942 {
 943   //
 944   Int_t modnum = 0;
 945   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 946   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 947   TString vpappend = "/TPC_OROC_1";
 948   TString snstr1="TPC/EndcapA/Sector";
 949   TString snstr2="TPC/EndcapC/Sector";
 950   TString snappend="/OuterChamber";
 951   TString volpath, symname;
 952
 953   for(Int_t cnt=1; cnt<=18; cnt++){
 954     volpath = vpstr1;
 955     volpath += cnt;
 956     volpath += vpappend;
 957     symname = snstr1;
 958     symname += cnt;
 959     symname += snappend;
 960     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 961       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 962     modnum++;
 963   }
 964
 965   for(Int_t cnt=1; cnt<=18; cnt++){
 966     volpath = vpstr2;
 967     volpath += cnt;
 968     volpath += vpappend;
 969     symname = snstr2;
 970     symname += cnt;
 971     symname += snappend;
 972     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 973       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 974     modnum++;
 975   }
 976 }
 977
 978 //_____________________________________________________________________________
 979 void AliTPCv2::DrawDetector() const
 980 {
 981   //
 982   // Draw a shaded view of the Time Projection Chamber version 1
 983   //
 984
 985   // Set everything unseen
 986   gMC->Gsatt("*", "seen", -1);
 987   //
 988   // Set ALIC mother transparent
 989   gMC->Gsatt("ALIC","SEEN",0);
 990   //
 991   // Set the volumes visible
 992   //
 993
 994   gMC->Gsatt("TPC ","SEEN",0);
 995   gMC->Gsatt("TOIN","SEEN",1);
 996   gMC->Gsatt("TOIN","COLO",7);
 997   gMC->Gsatt("TOCV","SEEN",1);
 998   gMC->Gsatt("TOCV","COLO",4);
 999   gMC->Gsatt("TSA1","SEEN",0);
1000   gMC->Gsatt("TSA2","SEEN",0);
1001   gMC->Gsatt("TSA3","SEEN",0);
1002   gMC->Gsatt("TSA4","SEEN",0);
1003   gMC->Gsatt("TSA5","SEEN",0);
1004   gMC->Gsatt("TOFC","SEEN",1);
1005   gMC->Gsatt("TOFC","COLO",4);
1006   gMC->Gsatt("TSA6","SEEN",0);
1007   gMC->Gsatt("TSA7","SEEN",0);
1008   gMC->Gsatt("TSA8","SEEN",0);
1009   gMC->Gsatt("TIIN","SEEN",1);
1010   gMC->Gsatt("TIIN","COLO",7);
1011   gMC->Gsatt("TII1","SEEN",0);
1012   gMC->Gsatt("TIFC","SEEN",1);
1013   gMC->Gsatt("TIFC","COLO",4);
1014   gMC->Gsatt("TSA9","SEEN",0);
1015   gMC->Gsatt("TS10","SEEN",0);
1016   gMC->Gsatt("TS11","SEEN",0);
1017   gMC->Gsatt("TS12","SEEN",0);
1018   gMC->Gsatt("TS13","SEEN",0);
1019   gMC->Gsatt("TS14","SEEN",0);
1020   gMC->Gsatt("TICC","SEEN",0);
1021   gMC->Gsatt("TICM","SEEN",0);
1022   gMC->Gsatt("TS15","SEEN",0);
1023   gMC->Gsatt("TS16","SEEN",0);
1024   gMC->Gsatt("TS17","SEEN",0);
1025   gMC->Gsatt("TS18","SEEN",0);
1026   gMC->Gsatt("TS19","SEEN",0);
1027   gMC->Gsatt("TPJ1","SEEN",0);
1028   gMC->Gsatt("TPJ2","SEEN",0);
1029   gMC->Gsatt("TICS","SEEN",0);
1030   gMC->Gsatt("TDGN","SEEN",0);
1031   gMC->Gsatt("TIRC","SEEN",0);
1032   gMC->Gsatt("TIC1","SEEN",1);
1033   gMC->Gsatt("TIPP","SEEN",0);
1034   gMC->Gsatt("TIC3","SEEN",0);
1035   gMC->Gsatt("TRCE","SEEN",0);
1036   gMC->Gsatt("TPSC","SEEN",0);
1037   gMC->Gsatt("TPCC","SEEN",0);
1038   gMC->Gsatt("TORC","SEEN",0);
1039   gMC->Gsatt("TOPP","SEEN",0);
1040   gMC->Gsatt("TOC3","SEEN",0);
1041   gMC->Gsatt("TOC1","SEEN",1);
1042   gMC->Gsatt("TSSW","SEEN",1);
1043   gMC->Gsatt("TSWC","SEEN",1);
1044   gMC->Gsatt("TSSW","COLO",3);
1045   gMC->Gsatt("TSWC","COLO",3);
1046   gMC->Gsatt("TSCE","COLO",6);
1047   gMC->Gsatt("TSCE","SEEN",1);
1048   gMC->Gsatt("TWES","SEEN",0);
1049   gMC->Gsatt("TSWB","SEEN",0);
1050   gMC->Gsatt("TPEL","SEEN",0);
1051   gMC->Gsatt("TPMW","SEEN",1);
1052   gMC->Gsatt("TESR","SEEN",1);
1053   gMC->Gsatt("TPMW","COLO",12);
1054   gMC->Gsatt("TIC1","COLO",5);
1055   gMC->Gsatt("TOC1","COLO",5);
1056   gMC->Gsatt("TESB","SEEN",0);
1057   gMC->Gsatt("THVM","SEEN",1);
1058   gMC->Gsatt("THVM","COLO",11);
1059   gMC->Gsatt("THVH","SEEN",0);
1060   gMC->Gsatt("TPSR","SEEN",0);
1061   gMC->Gsatt("THVL","SEEN",0);
1062   gMC->Gsatt("THVC","SEEN",0);
1063   gMC->Gsatt("THVE","SEEN",0);
1064   gMC->Gsatt("THVR","SEEN",0);
1065   gMC->Gsatt("TPSS","SEEN",0);
1066   gMC->Gsatt("TPUS","SEEN",0);
1067   gMC->Gsatt("TPLS","SEEN",0);
1068
1069   //
1070   gMC->Gdopt("hide", "on");
1071   gMC->Gdopt("shad", "on");
1072   gMC->Gsatt("*", "fill", 7);
1073   gMC->SetClipBox(".");
1074   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1075   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1076   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1077   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1078   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1079   gMC->DefaultRange();
1080   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1081   gMC->Gdhead(1111, "Time Projection Chamber");
1082   gMC->Gdman(18, 4, "MAN");
1083   gMC->Gdopt("hide","off");
1084 }
1085
1086 //_____________________________________________________________________________
1087 void AliTPCv2::CreateMaterials()
1088 {
1089   //
1090   // Define materials for version 2 of the Time Projection Chamber
1091   //
1092
1093   AliTPC::CreateMaterials();
1094 }
1095
1096 //_____________________________________________________________________________
1097 void AliTPCv2::Init()
1098 {
1099   //
1100   // Initialises version 2 of the TPC after that it has been built
1101   //
1102
1103   Int_t *idtmed = fIdtmed->GetArray();
1104
1105   AliTPC::Init();
1106
1107
1108   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1109
1110   fIDrift=gMC->VolId("TPC_Drift");
1111   fSecOld=-100; // fake number
1112
1113   gMC->SetMaxNStep(30000); // max. number of steps increased
1114
1115   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
1116
1117   AliInfo("*** TPC version 2 initialized ***");
1118   AliInfo(Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1119
1120   //
1121
1122 }
1123
1124 //_____________________________________________________________________________
1125 void AliTPCv2::StepManager()
1126 {
1127   //
1128   // Called for every step in the Time Projection Chamber
1129   //
1130
1131   //
1132   // parameters used for the energy loss calculations
1133   //
1134   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1135   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1136   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1137
1138
1139   const Float_t kbig = 1.e10;
1140
1141   Int_t id,copy;
1142   Float_t hits[5];
1143   Int_t vol[2];
1144   TLorentzVector p;
1145
1146   vol[1]=0; // preset row number to 0
1147   //
1148   gMC->SetMaxStep(kbig);
1149
1150   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1151
1152   Float_t charge = gMC->TrackCharge();
1153
1154   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1155
1156   // check the sensitive volume
1157
1158   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1159   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1160
1161   gMC->TrackPosition(p);
1162   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1163   //
1164
1165   //
1166   Double_t angle = TMath::ACos(p[0]/r);
1167   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1168   //
1169   // angular segment, it is not a real sector number...
1170   //
1171   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1172                fTPCParam->GetInnerAngle());
1173   // rotate to segment "0"
1174   Float_t cos,sin;
1175   fTPCParam->AdjustCosSin(sector,cos,sin);
1176   Float_t x1=p[0]*cos + p[1]*sin;
1177   // check if within sector's limits
1178   if(x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp()
1179      ||x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp()){
1180   // calculate real sector number...
1181   if (x1>fTPCParam->GetOuterRadiusLow()){
1182     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1183              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1184     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1185   }
1186     else
1187       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1188   //
1189   // here I have a sector number
1190   //
1191
1192   vol[0]=sector;
1193   // check if change of sector
1194   if(sector != fSecOld){
1195     fSecOld=sector;
1196     // add track reference
1197     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
1198   }
1199   // track is in the sensitive strip
1200   if(id == fIdSens){
1201     // track is entering the strip
1202     if (gMC->IsTrackEntering()){
1203       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1204       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1205       // row numbers are autonomous for lower and upper sectors
1206       if(vol[0] > fTPCParam->GetNInnerSector()) {
1207         vol[1] -= fTPCParam->GetNRowLow();
1208       }
1209     //
1210       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1211
1212         // lower sector, row 0, because Jouri wants to have this
1213
1214         gMC->TrackMomentum(p);
1215         hits[0]=p[0];
1216         hits[1]=p[1];
1217         hits[2]=p[2];
1218         hits[3]=0.; // this hit has no energy loss
1219         // Get also the track time for pileup simulation
1220         hits[4]=gMC->TrackTime();
1221
1222         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1223       }
1224     //
1225
1226        gMC->TrackPosition(p);
1227        hits[0]=p[0];
1228        hits[1]=p[1];
1229        hits[2]=p[2];
1230        hits[3]=0.; // this hit has no energy loss
1231        // Get also the track time for pileup simulation
1232        hits[4]=gMC->TrackTime();
1233
1234        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1235
1236     }
1237     else return;
1238   }
1239   //-----------------------------------------------------------------
1240   //  charged particle is in the sensitive drift volume
1241   //-----------------------------------------------------------------
1242   if(gMC->TrackStep() > 0) {
1243
1244     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1245     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1246     //
1247     gMC->TrackPosition(p);
1248     hits[0]=p[0];
1249     hits[1]=p[1];
1250     hits[2]=p[2];
1251     hits[3]=(Float_t)nel;
1252
1253     // Add this hit
1254
1255     if (fHitType&&2){
1256       gMC->TrackMomentum(p);
1257       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1258       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1259       fTrackHits->SetHitPrecision(precision);
1260     }
1261
1262     // Get also the track time for pileup simulation
1263     hits[4]=gMC->TrackTime();
1264
1265     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1266
1267   } // step>0
1268   } //within sector's limits
1269   // Stemax calculation for the next step
1270
1271   Float_t pp;
1272   TLorentzVector mom;
1273   gMC->TrackMomentum(mom);
1274   Float_t ptot=mom.Rho();
1275   Float_t betaGamma = ptot/gMC->TrackMass();
1276
1277   Int_t pid=gMC->TrackPid();
1278   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1279     {
1280       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1281     }
1282   else
1283     {
1284
1285       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1286       pp=kprim*BetheBloch(betaGamma);
1287
1288       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1289     }
1290
1291   Double_t rnd = gMC->GetRandom()->Rndm();
1292
1293   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1294
1295
1296 }
1297
1298 //_____________________________________________________________________________
1299 Float_t AliTPCv2::BetheBloch(Float_t bg)
1300 {
1301   //
1302   // Bethe-Bloch energy loss formula
1303   //
1304   const Double_t kp1=0.76176e-1;
1305   const Double_t kp2=10.632;
1306   const Double_t kp3=0.13279e-4;
1307   const Double_t kp4=1.8631;
1308   const Double_t kp5=1.9479;
1309
1310   Double_t dbg = (Double_t) bg;
1311
1312   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1313
1314   Double_t aa = TMath::Power(beta,kp4);
1315   Double_t bb = TMath::Power(1./dbg,kp5);
1316
1317   bb=TMath::Log(kp3+bb);
1318
1319   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1320 }
1321
1322