TPC/AliTPCv4.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 /*
  17 $Log$
  18 Revision 1.1  2007/06/24 20:56:19  hristov
  19 TPC version for the krypton runs (Marek)
  20
  21 */
  22
  23 //
  24 ///////////////////////////////////////////////////////////////////////////////
  25 //                                                                           //
  26 //  Time Projection Chamber version 4 -- detailed TPC and slow simulation    //
  27 //  of Krypton  decays                                                       //
  28 //                                                                           //
  29 //Begin_Html                                                                 //
  30 /*
  31 <img src="picts/AliTPCv2Class.gif">
  32 */
  33 //End_Html
  34 //                                                                           //
  35 //                                                                           //
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 //#include <stdlib.h>
  39
  40 #include <TLorentzVector.h>
  41 #include <TPDGCode.h>
  42 #include <TString.h>
  43 #include "AliLog.h"
  44 #include "AliTPCParam.h"
  45 #include "AliTPCTrackHitsV2.h"
  46 #include "AliTPCv4.h"
  47 #include "TGeoVolume.h"
  48 #include "TGeoPcon.h"
  49 #include "TGeoTube.h"
  50 #include "TGeoPgon.h"
  51 #include "TGeoTrd1.h"
  52 #include "TGeoCompositeShape.h"
  53 #include "TGeoPara.h"
  54 #include "TGeoPhysicalNode.h"
  55
  56 ClassImp(AliTPCv4)
  57
  58 //_____________________________________________________________________________
  59 AliTPCv4::AliTPCv4(const char *name, const char *title) :
  60   AliTPC(name, title),
  61   fIdSens(0),
  62   fIDrift(0),
  63   fSecOld(0)
  64 {
  65   //
  66   // Standard constructor for Time Projection Chamber version 2
  67   //
  68
  69
  70   SetBufferSize(128000);
  71
  72
  73   if (fTPCParam)
  74      fTPCParam->Write(fTPCParam->GetTitle());
  75 }
  76
  77 //_____________________________________________________________________________
  78 void AliTPCv4::CreateGeometry()
  79 {
  80   //
  81   // Create the geometry of Time Projection Chamber version 2
  82   //
  83   //Begin_Html
  84   /*
  85     <img src="picts/AliTPC.gif">
  86   */
  87   //End_Html
  88   //Begin_Html
  89   /*
  90     <img src="picts/AliTPCv2Tree.gif">
  91   */
  92   //End_Html
  93
  94   //----------------------------------------------------------
  95   // This geometry is written using TGeo class
  96   // Firstly the shapes are defined, and only then the volumes
  97   // What is recognized by the MC are volumes
  98   //----------------------------------------------------------
  99   //
 100   //  tpc - this will be the mother volume
 101   //
 102
 103   //
 104   // here I define a volume TPC
 105   // retrive the medium name with "TPC_" as a leading string
 106   //
 107   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
 108   tpc->DefineSection(0,-290.,77.,278.);
 109   tpc->DefineSection(1,-259.6,70.,278.);
 110   //
 111   tpc->DefineSection(2,-259.6,68.1,278.);
 112   tpc->DefineSection(3,-253.6,68.1,278.);
 113   //
 114   tpc->DefineSection(4,-253.6,68.,278.);
 115   tpc->DefineSection(5,-74.0,60.8,278.);
 116   //
 117   tpc->DefineSection(6,-74.0,60.1,278.);
 118   tpc->DefineSection(7,-73.3,60.1,278.);
 119   //
 120   tpc->DefineSection(8,-73.3,56.9,278.);
 121   tpc->DefineSection(9,73.3,56.9,278.);
 122   //
 123   tpc->DefineSection(10,73.3,60.1,278.);
 124   tpc->DefineSection(11,74.0,60.1,278.);
 125   //
 126   tpc->DefineSection(12,74.0,60.8,278.);
 127   tpc->DefineSection(13,253.6,65.5,278.);
 128   //
 129   tpc->DefineSection(14,253.6,65.6,278.);
 130   tpc->DefineSection(15,259.6,65.6,278.);
 131   //
 132   tpc->DefineSection(16,259.6,70.0,278.);
 133   tpc->DefineSection(17,290.,77.,278.);
 134   //
 135   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
 136   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
 137   //
 138   // drift volume - sensitive volume, extended beyond the
 139   // endcaps, because of the alignment
 140   //
 141   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
 142   dvol->DefineSection(0,-260.,74.5,264.4);
 143   dvol->DefineSection(1,-253.6,74.5,264.4);
 144   //
 145   dvol->DefineSection(2,-253.6,76.6774,258.);
 146   dvol->DefineSection(3,253.6,76.6774,258.);
 147   //
 148   dvol->DefineSection(4,253.6,74.5,264.4);
 149   dvol->DefineSection(5,260.,74.5,264.4);
 150   //
 151   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-3");
 152   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
 153   //
 154   v1->AddNode(v9,1);
 155   //
 156   // outer insulator
 157   //
 158   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
 159   //
 160   tpco->DefineSection(0,-256.6,264.8,278.);
 161   tpco->DefineSection(1,-253.6,264.8,278.);
 162   //
 163   tpco->DefineSection(2,-253.6,258.,278.);
 164   tpco->DefineSection(3,250.6,258.,278.);
 165   //
 166   tpco->DefineSection(4,250.6,258.,275.5);
 167   tpco->DefineSection(5,253.6,258.,275.5);
 168   //
 169   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
 170   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
 171   //
 172   // outer containment vessel
 173   //
 174   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
 175   //
 176   tocv->DefineSection(0,-256.6,264.8,278.);
 177   tocv->DefineSection(1,-253.6,264.8,278.);
 178   //
 179   tocv->DefineSection(2,-253.6,274.8124,278.);
 180   tocv->DefineSection(3,247.6,274.8124,278.);
 181   //
 182   tocv->DefineSection(4,247.6,270.4,278.);
 183   tocv->DefineSection(5,250.6,270.4,278.);
 184   //
 185   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
 186   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3);
 187   //
 188   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
 189   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
 190   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
 191   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
 192   //
 193   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
 194   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
 195   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
 196   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
 197   //
 198   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
 199   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
 200   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
 201   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
 202  //-------------------------------------------------------
 203   //  Tpc Outer Field Cage
 204   //  daughters - composite (sandwich)
 205   //-------------------------------------------------------
 206
 207   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
 208   //
 209   tofc->DefineSection(0,-253.6,258.,269.6);
 210   tofc->DefineSection(1,-250.6,258.,269.6);
 211   //
 212   tofc->DefineSection(2,-250.6,258.,260.0676);
 213   tofc->DefineSection(3,250.6,258.,260.0676);
 214   //
 215   tofc->DefineSection(4,250.6,258.,275.5);
 216   tofc->DefineSection(5,253.6,258.,275.5);
 217   //
 218   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3);
 219   //sandwich
 220   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
 221   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
 222   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
 223   //
 224   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
 225   //
 226   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
 227   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
 228   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
 229   //
 230   // outer part - positioning
 231   //
 232   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
 233   //
 234   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
 235   //
 236   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
 237   //
 238   v2->AddNode(v3,1); v2->AddNode(v4,1);
 239   //
 240   v1->AddNode(v2,1);
 241   //--------------------------------------------------------------------
 242   // Tpc Inner INsulator (CO2)
 243   // the cones, the central drum and the inner f.c. sandwich with a piece
 244   // of the flane will be placed in the TPC
 245   //--------------------------------------------------------------------
 246   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
 247   //
 248   tpci->DefineSection(0,-253.6,68.4,76.6774);
 249   tpci->DefineSection(1,-74.0,61.2,76.6774);
 250   //
 251   tpci->DefineSection(2,74.0,61.2,76.6774);
 252   //
 253   tpci->DefineSection(3,253.6,65.9,76.6774);
 254   //
 255   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
 256   //
 257   // now the inner field cage - only part of flanges (2 copies)
 258   //
 259   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5);
 260   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
 261   //
 262  //---------------------------------------------------------
 263   // Tpc Inner Containment vessel - Muon side
 264   //---------------------------------------------------------
 265   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
 266   //
 267   tcms->DefineSection(0,-259.1,68.1,74.2);
 268   tcms->DefineSection(1,-253.6,68.1,74.2);
 269   //
 270   tcms->DefineSection(2,-253.6,68.1,68.4);
 271   tcms->DefineSection(3,-74.0,60.9,61.2);
 272   //
 273   tcms->DefineSection(4,-74.0,60.1,61.2);
 274   tcms->DefineSection(5,-73.3,60.1,61.2);
 275   //
 276   tcms->DefineSection(6,-73.3,56.9,61.2);
 277   tcms->DefineSection(7,-73.0,56.9,61.2);
 278   //
 279   tcms->DefineSection(8,-73.0,56.9,58.8);
 280   tcms->DefineSection(9,-71.3,56.9,58.8);
 281   //
 282   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
 283   //-----------------------------------------------
 284   // inner containment vessel - shaft side
 285   //-----------------------------------------------
 286   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
 287   //
 288   tcss->DefineSection(0,71.3,56.9,58.8);
 289   tcss->DefineSection(1,73.0,56.9,58.8);
 290   //
 291   tcss->DefineSection(2,73.0,56.9,61.2);
 292   tcss->DefineSection(3,73.3,56.9,61.2);
 293   //
 294   tcss->DefineSection(4,73.3,60.1,61.2);
 295   tcss->DefineSection(5,74.0,60.1,61.2);
 296   //
 297   tcss->DefineSection(6,74.0,60.9,61.2);
 298   tcss->DefineSection(7,253.6,65.6,65.9);
 299   //
 300   tcss->DefineSection(8,253.6,65.6,74.2);
 301   tcss->DefineSection(9,258.1,65.6,74.2);
 302   //
 303   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
 304   //-----------------------------------------------
 305   //  Inner field cage
 306   //  define 4 parts and make an assembly
 307   //-----------------------------------------------
 308   // part1 - Al - 2 copies
 309   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
 310   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
 311   // sandwich - outermost parts - 2 copies
 312   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
 313   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
 314   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
 315   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
 316   //
 317   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
 318   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
 319   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
 320   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
 321   //
 322   // middle parts - 2 copies
 323   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
 324   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
 325   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
 326   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
 327   //
 328   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
 329   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
 330   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
 331   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
 332   // central part - 1 copy
 333   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns
 334   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
 335   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
 336   //
 337   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
 338   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
 339   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
 340   //
 341   // inner part - positioning
 342   //
 343   // creating a sandwich
 344   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
 345   //
 346   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
 347   //
 348   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
 349   //
 350   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
 351   //
 352   tv100->AddNode(tv10,1);
 353   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
 354   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
 355   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
 356   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
 357   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
 358   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
 359   //
 360   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
 361   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
 362   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1);
 363   v9->AddNode(tv100,1);
 364   //
 365   // central drum
 366   //
 367   // flange + sandwich
 368   //
 369   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
 370   cfl->DefineSection(0,-71.1,59.7,61.2);
 371   cfl->DefineSection(1,-68.6,59.7,61.2);
 372   //
 373   cfl->DefineSection(2,-68.6,60.6324,61.2);
 374   cfl->DefineSection(3,68.6,60.6324,61.2);
 375   //
 376   cfl->DefineSection(4,68.6,59.7,61.2);
 377   cfl->DefineSection(5,71.1,59.7,61.2);
 378   //
 379   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
 380   // sandwich
 381   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
 382   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
 383   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);
 384   //
 385   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
 386   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
 387   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
 388   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
 389   //
 390   // seals for central drum 2 copies
 391   //
 392   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
 393   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
 394   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
 395   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
 396   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
 397   //
 398   // seal collars
 399   TGeoPcon *se = new TGeoPcon(0.,360.,6);
 400   se->DefineSection(0,-72.8,59.7,61.2);
 401   se->DefineSection(1,-72.3,59.7,61.2);
 402   //
 403   se->DefineSection(2,-72.3,58.85,61.2);
 404   se->DefineSection(3,-71.6,58.85,61.2);
 405   //
 406   se->DefineSection(4,-71.6,59.7,61.2);
 407   se->DefineSection(5,-71.3,59.7,61.2);
 408   //
 409   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
 410   //
 411   TGeoTube *si = new TGeoTube(56.9,58.8,1.);
 412   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
 413   //
 414   // define reflection matrix
 415   //
 416   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
 417   //
 418   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
 419   //
 420   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
 421   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
 422   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
 423   //
 424   // central membrane - 2 rings and a mylar membrane - assembly
 425   //
 426   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
 427   TGeoTube *oh = new TGeoTube(250.,256.,.5);
 428   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
 429   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
 430   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
 431   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
 432   //
 433   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
 434   cm->AddNode(ihv,1);
 435   cm->AddNode(ohv,1);
 436   cm->AddNode(memv,1);
 437   v9->AddNode(cm,1);
 438   //
 439   // end caps - they are make as an assembly of single segments
 440   // containing both readout chambers
 441   //
 442   Double_t openingAngle = 10.*TMath::DegToRad();
 443   Double_t thick=1.5; // rib
 444   Double_t shift = thick/TMath::Sin(openingAngle);
 445   //
 446   Double_t lowEdge = 86.3; // hole in the wheel
 447   Double_t upEdge = 240.4; // hole in the wheel
 448   //
 449   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
 450   //
 451   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
 452   //
 453   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
 454   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
 455   //
 456   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
 457   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
 458   //
 459   Double_t ys = shift*TMath::Sin(openingAngle);
 460   Double_t xs = shift*TMath::Cos(openingAngle);
 461   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);
 462   tr->RegisterYourself();
 463   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
 464   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
 465   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
 466   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
 467   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
 468   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
 469   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
 470   //
 471   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
 472   //
 473   // readout chambers
 474   //
 475   // IROC first
 476   //
 477    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
 478    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
 479   // empty space
 480    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
 481    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
 482    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
 483    //bars
 484    Double_t tga = (19.8328-12.3742)/39.3;
 485    Double_t xmin,xmax;
 486    xmin = 9.55*tga+12.3742;
 487    xmax = 9.95*tga+12.3742;
 488    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 489    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
 490    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
 491    xmin=19.4*tga+12.3742;
 492    xmax=19.9*tga+12.3742;
 493    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
 494    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
 495    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
 496    xmin=29.35*tga+12.3742;
 497    xmax=29.75*tga+12.3742;
 498    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2);
 499    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);
 500    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
 501    //
 502    // holes for connectors
 503    //
 504    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
 505    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
 506    TString fileName(gSystem->Getenv("ALICE_ROOT"));
 507    fileName += "/TPC/conn_iroc.dat";
 508    ifstream in;
 509    in.open(fileName.Data(), ios_base::in); // asci file
 510    for(Int_t i =0;i<86;i++){
 511       Double_t y = 3.99;
 512       Double_t x,z,ang;
 513       in>>x>>z>>ang;
 514       z-=26.5;
 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 *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
 679    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
 680    TGeoRotation rot1("rot1",90.,90.,0.);
 681    TGeoRotation rot2("rot2");
 682    rot2.RotateY(10.);
 683    TGeoRotation *rot = new TGeoRotation("rot");
 684    *rot=rot1*rot2;
 685    //
 686    Double_t x0,y0;
 687    x0=110.2*TMath::Cos(openingAngle);
 688    y0=110.2*TMath::Sin(openingAngle);
 689    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side
 690    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
 691    x0=188.45*TMath::Cos(openingAngle);
 692    y0=188.45*TMath::Sin(openingAngle);
 693    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
 694    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
 695    //
 696    //
 697    // A-side
 698    //
 699    secta->AddNode(ch,1);
 700    secta->AddNode(iroc,1,combi1a);
 701    secta->AddNode(oroc,1,combi2a);
 702    //
 703    // C-side
 704    //
 705    sectc->AddNode(ch,1);
 706    sectc->AddNode(iroc,1,combi1c);
 707    sectc->AddNode(oroc,1,combi2c);
 708    //
 709    // now I try to make  wheels...
 710    //
 711    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
 712    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
 713    //
 714    for(Int_t i =0;i<18;i++){
 715      Double_t phi = (20.*i);
 716      TGeoRotation *r = new TGeoRotation();
 717      r->RotateZ(phi);
 718      wheela->AddNode(secta,i+1,r);
 719      wheelc->AddNode(sectc,i+1,r);
 720
 721    }
 722    // wheels in the drift volume!
 723
 724    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
 725    v9->AddNode(wheela,1,combi3);
 726    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
 727    //_____________________________________________________________
 728    // service support wheel
 729    //_____________________________________________________________
 730   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
 731   sw->DefineSection(0,-4.,80.5,251.75);
 732   sw->DefineSection(1,4.,80.5,251.75);
 733   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
 734   //
 735   thick=1.;
 736   shift = thick/TMath::Sin(openingAngle);
 737   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
 738   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
 739   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
 740   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
 741   //
 742   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si");
 743   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
 744   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
 745   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
 746   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si
 747   //
 748   shv->AddNode(elv,1);
 749   //
 750   //
 751   ys = shift*TMath::Sin(openingAngle);
 752   xs = shift*TMath::Cos(openingAngle);
 753   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
 754   // cover
 755   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
 756   co->DefineSection(0,-0.5,77.,255.25);
 757   co->DefineSection(1,0.5,77.,255.25);
 758   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
 759   // hole in a cover
 760   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
 761   shift=4./TMath::Sin(openingAngle);
 762   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
 763   coh->DefineSection(1,0.5,85.-shift,247.25-shift);
 764   //
 765   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
 766   //
 767   ys = shift*TMath::Sin(openingAngle);
 768   xs = shift*TMath::Cos(openingAngle);
 769   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
 770   //
 771   // Sector as an Assembly
 772   //
 773   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
 774   swhs->AddNode(swv,1);
 775   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
 776   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
 777   //
 778   // SSW as an Assembly of sectors
 779   //
 780  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
 781    for(Int_t i =0;i<18;i++){
 782      Double_t phi = (20.*i);
 783      TGeoRotation *r = new TGeoRotation();
 784      r->RotateZ(phi);
 785      swheel->AddNode(swhs,i+1,r);
 786    }
 787    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
 788    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
 789
 790    // sensitive strips - strip "0" is always set
 791    // conditional
 792    Int_t totrows;
 793    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
 794    Double_t *upar;
 795    upar=NULL;
 796    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
 797    upar=new Double_t [10];
 798    upar[0]=0.;
 799    upar[1]=360.;
 800    upar[2]=18.;
 801    upar[3]=2.;
 802    //
 803    upar[4]=-124.8;
 804    upar[7]=124.8;
 805
 806    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
 807
 808    upar[5]=rlow;
 809    upar[6]=rlow+.01;
 810    upar[8]=upar[5];
 811    upar[9]=upar[6];
 812    //
 813    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 814    gGeoManager->Node("TPC_Strip",totrows+1,
 815                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 816    //
 817    // now, strips optionally
 818    //
 819    if(fSens){
 820      //lower sectors
 821      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
 822        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
 823        upar[5]=rlow;
 824        upar[6]=rlow+.01;
 825        upar[8]=upar[5];
 826        upar[9]=upar[6];
 827        gGeoManager->Node("TPC_Strip",i,
 828                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 829        gGeoManager->Node("TPC_Strip",totrows+i,
 830                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 831      }
 832      //upper sectors
 833      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
 834        rlow=fTPCParam->GetPadRowRadiiUp(i-1);
 835        upar[5]=rlow;
 836        upar[6]=rlow+.01;
 837        upar[8]=upar[5];
 838        upar[9]=upar[6];
 839        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
 840                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
 841        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
 842                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
 843      }
 844    }//strips
 845   //----------------------------------------------------------
 846   // TPc Support Rods - MAKROLON
 847   //----------------------------------------------------------
 848   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
 849   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
 850   // upper and lower rods differ in length!
 851   delete [] upar;
 852   upar=NULL;
 853   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
 854   upar=new Double_t [3];
 855   upar[0]=1.8;
 856   upar[1]=2.2;
 857
 858   //
 859   //HV rods - makrolon + 0.58cm (diameter) Cu
 860   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
 861   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
 862   //
 863   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
 864   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
 865   hvrv->AddNode(hvcv,1);
 866
 867   for(Int_t i=0;i<18;i++){
 868     Double_t angle,x,y;
 869     Double_t z,r;
 870     angle=TMath::DegToRad()*20.*(Double_t)i;
 871     r=81.5;
 872     x=r * TMath::Cos(angle);
 873     y=r * TMath::Sin(angle);
 874     upar[2]=126.64; //lower
 875     z= 126.96;
 876     if(i==15){
 877       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
 878       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
 879     }
 880     else{
 881      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
 882      gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
 883     }
 884     r=254.25;
 885     x=r * TMath::Cos(angle);
 886     y=r * TMath::Sin(angle);
 887     upar[2]=126.54; //upper
 888     z=127.06;
 889     gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
 890     gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
 891   }
 892
 893   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
 894   alice->AddNode(v1,1);
 895
 896 } // end of function
 897
 898 //_____________________________________________________________________________
 899 void AliTPCv4::AddAlignableVolumes() const
 900 {
 901   //
 902   // Create entries for alignable volumes associating the symbolic volume
 903   // name with the corresponding volume path. Needs to be syncronized with
 904   // eventual changes in the geometry.
 905   //
 906   SetInnerChambersAlignable();
 907   SetOuterChambersAlignable();
 908 }
 909
 910 //_____________________________________________________________________________
 911 void AliTPCv4::SetInnerChambersAlignable() const
 912 {
 913   //
 914   Int_t modnum = 0;
 915   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 916   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 917   TString vpappend = "/TPC_IROC_1";
 918   TString snstr1="TPC/EndcapA/Sector";
 919   TString snstr2="TPC/EndcapC/Sector";
 920   TString snappend="/InnerChamber";
 921   TString volpath, symname;
 922
 923   for(Int_t cnt=1; cnt<=18; cnt++){
 924     volpath = vpstr1;
 925     volpath += cnt;
 926     volpath += vpappend;
 927     symname = snstr1;
 928     symname += cnt;
 929     symname += snappend;
 930     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 931       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 932     //
 933     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 934     const char *path = alignableEntry->GetTitle();
 935     if (!gGeoManager->cd(path))
 936       AliFatal(Form("Volume path %s not valid!",path));
 937     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 938     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,cnt-1);
 939     alignableEntry->SetMatrix(matTtoL);
 940     modnum++;
 941   }
 942
 943   for(Int_t cnt=1; cnt<=18; cnt++){
 944     volpath = vpstr2;
 945     volpath += cnt;
 946     volpath += vpappend;
 947     symname = snstr2;
 948     symname += cnt;
 949     symname += snappend;
 950     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 951       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 952     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 953     const char *path = alignableEntry->GetTitle();
 954     if (!gGeoManager->cd(path))
 955       AliFatal(Form("Volume path %s not valid!",path));
 956     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 957     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,18+cnt-1);
 958     alignableEntry->SetMatrix(matTtoL);
 959     modnum++;
 960   }
 961 }
 962
 963 //_____________________________________________________________________________
 964 void AliTPCv4::SetOuterChambersAlignable() const
 965 {
 966   //
 967   Int_t modnum = 0;
 968   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
 969   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
 970   TString vpappend = "/TPC_OROC_1";
 971   TString snstr1="TPC/EndcapA/Sector";
 972   TString snstr2="TPC/EndcapC/Sector";
 973   TString snappend="/OuterChamber";
 974   TString volpath, symname;
 975
 976   for(Int_t cnt=1; cnt<=18; cnt++){
 977     volpath = vpstr1;
 978     volpath += cnt;
 979     volpath += vpappend;
 980     symname = snstr1;
 981     symname += cnt;
 982     symname += snappend;
 983     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
 984       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
 985     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
 986     const char *path = alignableEntry->GetTitle();
 987     if (!gGeoManager->cd(path))
 988       AliFatal(Form("Volume path %s not valid!",path));
 989     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
 990     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+cnt-1);
 991     alignableEntry->SetMatrix(matTtoL);
 992     modnum++;
 993   }
 994
 995   for(Int_t cnt=1; cnt<=18; cnt++){
 996     volpath = vpstr2;
 997     volpath += cnt;
 998     volpath += vpappend;
 999     symname = snstr2;
1000     symname += cnt;
1001     symname += snappend;
1002     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data()))
1003       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1004      TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntry(symname.Data());
1005     const char *path = alignableEntry->GetTitle();
1006     if (!gGeoManager->cd(path))
1007       AliFatal(Form("Volume path %s not valid!",path));
1008     TGeoHMatrix* globMatrix = gGeoManager->GetCurrentMatrix();
1009     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+18+cnt-1);
1010     alignableEntry->SetMatrix(matTtoL);
1011     modnum++;
1012   }
1013 }
1014
1015 //_____________________________________________________________________________
1016 void AliTPCv4::DrawDetector() const
1017 {
1018   //
1019   // Draw a shaded view of the Time Projection Chamber version 1
1020   //
1021
1022   // Set everything unseen
1023   gMC->Gsatt("*", "seen", -1);
1024   //
1025   // Set ALIC mother transparent
1026   gMC->Gsatt("ALIC","SEEN",0);
1027   //
1028   // Set the volumes visible
1029   //
1030
1031   gMC->Gsatt("TPC ","SEEN",0);
1032   gMC->Gsatt("TOIN","SEEN",1);
1033   gMC->Gsatt("TOIN","COLO",7);
1034   gMC->Gsatt("TOCV","SEEN",1);
1035   gMC->Gsatt("TOCV","COLO",4);
1036   gMC->Gsatt("TSA1","SEEN",0);
1037   gMC->Gsatt("TSA2","SEEN",0);
1038   gMC->Gsatt("TSA3","SEEN",0);
1039   gMC->Gsatt("TSA4","SEEN",0);
1040   gMC->Gsatt("TSA5","SEEN",0);
1041   gMC->Gsatt("TOFC","SEEN",1);
1042   gMC->Gsatt("TOFC","COLO",4);
1043   gMC->Gsatt("TSA6","SEEN",0);
1044   gMC->Gsatt("TSA7","SEEN",0);
1045   gMC->Gsatt("TSA8","SEEN",0);
1046   gMC->Gsatt("TIIN","SEEN",1);
1047   gMC->Gsatt("TIIN","COLO",7);
1048   gMC->Gsatt("TII1","SEEN",0);
1049   gMC->Gsatt("TIFC","SEEN",1);
1050   gMC->Gsatt("TIFC","COLO",4);
1051   gMC->Gsatt("TSA9","SEEN",0);
1052   gMC->Gsatt("TS10","SEEN",0);
1053   gMC->Gsatt("TS11","SEEN",0);
1054   gMC->Gsatt("TS12","SEEN",0);
1055   gMC->Gsatt("TS13","SEEN",0);
1056   gMC->Gsatt("TS14","SEEN",0);
1057   gMC->Gsatt("TICC","SEEN",0);
1058   gMC->Gsatt("TICM","SEEN",0);
1059   gMC->Gsatt("TS15","SEEN",0);
1060   gMC->Gsatt("TS16","SEEN",0);
1061   gMC->Gsatt("TS17","SEEN",0);
1062   gMC->Gsatt("TS18","SEEN",0);
1063   gMC->Gsatt("TS19","SEEN",0);
1064   gMC->Gsatt("TPJ1","SEEN",0);
1065   gMC->Gsatt("TPJ2","SEEN",0);
1066   gMC->Gsatt("TICS","SEEN",0);
1067   gMC->Gsatt("TDGN","SEEN",0);
1068   gMC->Gsatt("TIRC","SEEN",0);
1069   gMC->Gsatt("TIC1","SEEN",1);
1070   gMC->Gsatt("TIPP","SEEN",0);
1071   gMC->Gsatt("TIC3","SEEN",0);
1072   gMC->Gsatt("TRCE","SEEN",0);
1073   gMC->Gsatt("TPSC","SEEN",0);
1074   gMC->Gsatt("TPCC","SEEN",0);
1075   gMC->Gsatt("TORC","SEEN",0);
1076   gMC->Gsatt("TOPP","SEEN",0);
1077   gMC->Gsatt("TOC3","SEEN",0);
1078   gMC->Gsatt("TOC1","SEEN",1);
1079   gMC->Gsatt("TSSW","SEEN",1);
1080   gMC->Gsatt("TSWC","SEEN",1);
1081   gMC->Gsatt("TSSW","COLO",3);
1082   gMC->Gsatt("TSWC","COLO",3);
1083   gMC->Gsatt("TSCE","COLO",6);
1084   gMC->Gsatt("TSCE","SEEN",1);
1085   gMC->Gsatt("TWES","SEEN",0);
1086   gMC->Gsatt("TSWB","SEEN",0);
1087   gMC->Gsatt("TPEL","SEEN",0);
1088   gMC->Gsatt("TPMW","SEEN",1);
1089   gMC->Gsatt("TESR","SEEN",1);
1090   gMC->Gsatt("TPMW","COLO",12);
1091   gMC->Gsatt("TIC1","COLO",5);
1092   gMC->Gsatt("TOC1","COLO",5);
1093   gMC->Gsatt("TESB","SEEN",0);
1094   gMC->Gsatt("THVM","SEEN",1);
1095   gMC->Gsatt("THVM","COLO",11);
1096   gMC->Gsatt("THVH","SEEN",0);
1097   gMC->Gsatt("TPSR","SEEN",0);
1098   gMC->Gsatt("THVL","SEEN",0);
1099   gMC->Gsatt("THVC","SEEN",0);
1100   gMC->Gsatt("THVE","SEEN",0);
1101   gMC->Gsatt("THVR","SEEN",0);
1102   gMC->Gsatt("TPSS","SEEN",0);
1103   gMC->Gsatt("TPUS","SEEN",0);
1104   gMC->Gsatt("TPLS","SEEN",0);
1105
1106   //
1107   gMC->Gdopt("hide", "on");
1108   gMC->Gdopt("shad", "on");
1109   gMC->Gsatt("*", "fill", 7);
1110   gMC->SetClipBox(".");
1111   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1112   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1113   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1114   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1115   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1116   gMC->DefaultRange();
1117   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1118   gMC->Gdhead(1111, "Time Projection Chamber");
1119   gMC->Gdman(18, 4, "MAN");
1120   gMC->Gdopt("hide","off");
1121 }
1122
1123 //_____________________________________________________________________________
1124 void AliTPCv4::CreateMaterials()
1125 {
1126   //
1127   // Define materials for version 2 of the Time Projection Chamber
1128   //
1129
1130   AliTPC::CreateMaterials();
1131 }
1132
1133 //_____________________________________________________________________________
1134 void AliTPCv4::Init()
1135 {
1136   //
1137   // Initialises version 2 of the TPC after that it has been built
1138   //
1139
1140   Int_t *idtmed = fIdtmed->GetArray();
1141
1142   AliTPC::Init();
1143
1144
1145   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1146
1147   fIDrift=gMC->VolId("TPC_Drift");
1148   fSecOld=-100; // fake number
1149
1150   gMC->SetMaxNStep(30000); // max. number of steps increased
1151
1152   gMC->Gstpar(idtmed[20],"LOSS",6); // specific energy loss
1153
1154   AliInfo("*** TPC version 4 initialized ***");
1155   AliInfo(Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1156
1157   //
1158
1159 }
1160
1161 //_____________________________________________________________________________
1162 void AliTPCv4::StepManager()
1163 {
1164   //
1165   // Called for every step in the Time Projection Chamber
1166   //
1167
1168   //
1169   // parameters used for the energy loss calculations
1170   //
1171   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1172   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1173   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation
1174
1175
1176   const Float_t kbig = 1.e10;
1177
1178   Int_t id,copy;
1179   Float_t hits[5];
1180   Int_t vol[2];
1181   TLorentzVector p;
1182
1183   vol[1]=0; // preset row number to 0
1184   //
1185   gMC->SetMaxStep(kbig);
1186
1187
1188
1189   Float_t charge = gMC->TrackCharge();
1190
1191   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1192
1193   // check the sensitive volume
1194
1195   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1196   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume
1197
1198   gMC->TrackPosition(p);
1199   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1200   //
1201
1202   //
1203   Double_t angle = TMath::ACos(p[0]/r);
1204   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1205   //
1206   // angular segment, it is not a real sector number...
1207   //
1208   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1209                fTPCParam->GetInnerAngle());
1210   // rotate to segment "0"
1211   Float_t cos,sin;
1212   fTPCParam->AdjustCosSin(sector,cos,sin);
1213   Float_t x1=p[0]*cos + p[1]*sin;
1214   // check if within sector's limits
1215   if(x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp()
1216      ||x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp()){
1217   // calculate real sector number...
1218   if (x1>fTPCParam->GetOuterRadiusLow()){
1219     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1220              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1221     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1222   }
1223     else
1224       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);
1225   //
1226   // here I have a sector number
1227   //
1228
1229   vol[0]=sector;
1230   // check if change of sector
1231   if(sector != fSecOld){
1232     fSecOld=sector;
1233     // add track reference
1234     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber());
1235   }
1236   // track is in the sensitive strip
1237   if(id == fIdSens){
1238     // track is entering the strip
1239     if (gMC->IsTrackEntering()){
1240       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1241       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1242       // row numbers are autonomous for lower and upper sectors
1243       if(vol[0] > fTPCParam->GetNInnerSector()) {
1244         vol[1] -= fTPCParam->GetNRowLow();
1245       }
1246     //
1247       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1248
1249         // lower sector, row 0, because Jouri wants to have this
1250
1251         gMC->TrackMomentum(p);
1252         hits[0]=p[0];
1253         hits[1]=p[1];
1254         hits[2]=p[2];
1255         hits[3]=0.; // this hit has no energy loss
1256         // Get also the track time for pileup simulation
1257         hits[4]=gMC->TrackTime();
1258
1259         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1260       }
1261     //
1262
1263        gMC->TrackPosition(p);
1264        hits[0]=p[0];
1265        hits[1]=p[1];
1266        hits[2]=p[2];
1267        hits[3]=0.; // this hit has no energy loss
1268        // Get also the track time for pileup simulation
1269        hits[4]=gMC->TrackTime();
1270
1271        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1272
1273     }
1274     else return;
1275   }
1276   //-----------------------------------------------------------------
1277   //  charged particle is in the sensitive drift volume
1278   //-----------------------------------------------------------------
1279
1280   if(gMC->TrackStep() > 0){
1281
1282     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1283     nel=TMath::Min(nel,30); // 30 electrons corresponds to 1 keV
1284     //
1285     gMC->TrackPosition(p);
1286     hits[0]=p[0];
1287     hits[1]=p[1];
1288     hits[2]=p[2];
1289     hits[3]=(Float_t)nel;
1290
1291     // Add this hit
1292
1293     if (fHitType&&2){
1294       gMC->TrackMomentum(p);
1295       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1296       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1297       fTrackHits->SetHitPrecision(precision);
1298     }
1299
1300     // Get also the track time for pileup simulation
1301     hits[4]=gMC->TrackTime();
1302
1303     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1304
1305   } // step>0
1306   } //within sector's limits
1307   // Stemax calculation for the next step
1308   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1309   Float_t pp;
1310   TLorentzVector mom;
1311   gMC->TrackMomentum(mom);
1312   Float_t ptot=mom.Rho();
1313   Float_t betaGamma = ptot/gMC->TrackMass();
1314
1315   Int_t pid=gMC->TrackPid();
1316   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1317     {
1318       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1319     }
1320   else
1321     {
1322
1323       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1324       pp=kprim*BetheBloch(betaGamma);
1325
1326       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1327     }
1328
1329   Double_t rnd = gMC->GetRandom()->Rndm();
1330
1331   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1332
1333
1334 }
1335
1336 //_____________________________________________________________________________
1337 Float_t AliTPCv4::BetheBloch(Float_t bg)
1338 {
1339   //
1340   // Bethe-Bloch energy loss formula
1341   //
1342   const Double_t kp1=0.76176e-1;
1343   const Double_t kp2=10.632;
1344   const Double_t kp3=0.13279e-4;
1345   const Double_t kp4=1.8631;
1346   const Double_t kp5=1.9479;
1347
1348   Double_t dbg = (Double_t) bg;
1349
1350   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1351
1352   Double_t aa = TMath::Power(beta,kp4);
1353   Double_t bb = TMath::Power(1./dbg,kp5);
1354
1355   bb=TMath::Log(kp3+bb);
1356
1357   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1358 }
1359
1360