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1 /**************************************************************************
2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
5  * Contributors are mentioned in the code where appropriate.              *
6  *                                                                        *
7  * Permission to use, copy, modify and distribute this software and its   *
8  * documentation strictly for non-commercial purposes is hereby granted   *
9  * without fee, provided that the above copyright notice appears in all   *
10  * copies and that both the copyright notice and this permission notice   *
11  * appear in the supporting documentation. The authors make no claims     *
12  * about the suitability of this software for any purpose. It is          *
13  * provided "as is" without express or implied warranty.                  *
14  **************************************************************************/
15
16 /* $Id$ */
17
18 //
19 ///////////////////////////////////////////////////////////////////////////////
20 //                                                                           //
21 //  Time Projection Chamber version 1 -- detailed TPC and fast simulation    //
22 //                                                                           // 
23 //Begin_Html
24 /*
25 <img src="picts/AliTPCv1Class.gif">
26 */
27 //End_Html
28 //                                                                           //
29 //                                                                           //
30 ///////////////////////////////////////////////////////////////////////////////
31
32 #include <Riostream.h>
33 #include <stdlib.h>
34 #include <TInterpreter.h>
35 #include <TMath.h>
36 #include <TVirtualMC.h>
37 #include <TString.h>
38 #include <TSystem.h>
39
40 #include "AliConst.h"
41 #include "AliRun.h"
42 #include "AliTPCDigitsArray.h"
43 #include "AliTPCParam.h"
44 #include "AliTPCParamSR.h"
45 #include "AliTPCv1.h"
46 #include "TLorentzVector.h"
47 #include "AliMC.h"
48 #include "TGeoManager.h"
49 #include "TGeoVolume.h"
50 #include "TGeoPcon.h"
51 #include "TGeoTube.h"
52 #include "TGeoPgon.h"
53 #include "TGeoTrd1.h"
54 #include "TGeoCompositeShape.h"
55 #include "TGeoPara.h"
56 ClassImp(AliTPCv1)
57
58 //_____________________________________________________________________________
59
60   AliTPCv1::AliTPCv1():AliTPC(),fIdSens(0)
61 {
62
63   fHitType = 1;
64
65 }
66  
67 //_____________________________________________________________________________
68 AliTPCv1::AliTPCv1(const char *name, const char *title) 
69   :AliTPC(name, title),fIdSens(0)
70  {
71   //
72   // Standard constructor for Time Projection Chamber
73   //
74
75
76   if (fTPCParam)
77      fTPCParam->Write(fTPCParam->GetTitle());
78
79   fHitType=1;
80 }
81
82 //_____________________________________________________________________________
83 void AliTPCv1::CreateGeometry()
84 {
85   //-------------------------------------------------------------
86   // Creates geometry for Time Projection Chamber version 1
87   // Detailed geometry -- Fast simulation - space points
88   // at the pad-rows centers
89   // Origin M.Kowalski, INP Cracow, Marek.Kowalski@ifj.edu.pl
90   //-----------------------------------------------------------
91
92   //Begin_Html
93   /*
94     <img src="picts/AliTPC.gif">
95   */
96   //End_Html
97   //Begin_Html
98   /*
99     <img src="picts/AliTPCv1Tree.gif">
100   */
101   //End_Html
102   //----------------------------------------------------------
103   // This geometry is written using TGeo class
104   // Firstly the shapes are defined, and only then the volumes
105   // What is recognized by the MC are volumes
106   //----------------------------------------------------------
107   //
108   //  tpc - this will be the mother volume
109   //
110
111   //
112   // here I define a volume TPC
113   // retrive the medium name with "TPC_" as a leading string
114   //
115   TGeoPcon *tpc = new TGeoPcon(0.,360.,28); //28 sections
116   //
117   tpc->DefineSection(0,-291.,77.,278.);
118   tpc->DefineSection(1,-270,77.,278.);
119   //
120   tpc->DefineSection(2,-270.,77.,278.);
121   tpc->DefineSection(3,-262.1,77.,278.);
122   //
123   tpc->DefineSection(4,-262.1,83.1,278.);
124   tpc->DefineSection(5,-260.,83.1,278.);
125   //
126   tpc->DefineSection(6,-260.,70.,278.);    
127   tpc->DefineSection(7,-259.6,70.,278.);
128   //
129   tpc->DefineSection(8,-259.6,68.1,278.);
130   tpc->DefineSection(9,-253.6,68.1,278.);
131   //
132   tpc->DefineSection(10,-253.6,68.,278.);
133   tpc->DefineSection(11,-74.0,60.8,278.);
134   //
135   tpc->DefineSection(12,-74.0,60.1,278.);
136   tpc->DefineSection(13,-73.3,60.1,278.);
137   //
138   tpc->DefineSection(14,-73.3,56.9,278.); 
139   tpc->DefineSection(15,-68.5,56.9,278.);
140   //
141   tpc->DefineSection(16,-68.5,60.,278.);
142   tpc->DefineSection(17,-65.,60.,278.);
143   //
144   tpc->DefineSection(18,-65.,56.9,278.); 
145   tpc->DefineSection(19,73.3,56.9,278.);
146   //
147   tpc->DefineSection(20,73.3,60.1,278.);
148   tpc->DefineSection(21,74.0,60.1,278.);
149   //
150   tpc->DefineSection(22,74.0,60.8,278.);
151   tpc->DefineSection(23,253.6,65.5,278.);
152   //
153   tpc->DefineSection(24,253.6,65.6,278.);
154   tpc->DefineSection(25,259.6,65.6,278.);
155   //
156   tpc->DefineSection(26,259.6,70.0,278.);
157   tpc->DefineSection(27,291.,77.,278.);
158   //
159   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
160   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
161   //
162   // drift volume - sensitive volume, extended beyond the
163   // endcaps, because of the alignment
164   //
165   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
166   dvol->DefineSection(0,-260.,74.5,264.4);
167   dvol->DefineSection(1,-253.6,74.5,264.4);
168   //
169   dvol->DefineSection(2,-253.6,76.6774,258.);
170   dvol->DefineSection(3,253.6,76.6774,258.); 
171   //
172   dvol->DefineSection(4,253.6,74.5,264.4);
173   dvol->DefineSection(5,260.,74.5,264.4);
174   //
175   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-1");
176   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
177   //
178   //
179   v1->AddNode(v9,1);
180   //
181   // outer insulator
182   //
183   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
184   //
185   tpco->DefineSection(0,-256.6,264.8,278.);
186   tpco->DefineSection(1,-253.6,264.8,278.);
187   //
188   tpco->DefineSection(2,-253.6,258.,278.);
189   tpco->DefineSection(3,250.6,258.,278.);
190   //
191   tpco->DefineSection(4,250.6,258.,275.5);
192   tpco->DefineSection(5,253.6,258.,275.5);
193   //
194   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
195   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
196   //
197   // outer containment vessel
198   //
199   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
200   //
201   tocv->DefineSection(0,-256.6,264.8,278.);
202   tocv->DefineSection(1,-253.6,264.8,278.);
203   //
204   tocv->DefineSection(2,-253.6,274.8124,278.);
205   tocv->DefineSection(3,247.6,274.8124,278.);  
206   //
207   tocv->DefineSection(4,247.6,270.4,278.);
208   tocv->DefineSection(5,250.6,270.4,278.);
209   //
210   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
211   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
212   //
213   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
214   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
215   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
216   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
217   //
218   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
219   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
220   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
221   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
222   //
223   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
224   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
225   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
226   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
227
228   //-------------------------------------------------------
229   //  Tpc Outer Field Cage
230   //  daughters - composite (sandwich)
231   //-------------------------------------------------------
232
233   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
234   //
235   tofc->DefineSection(0,-253.6,258.,269.6);
236   tofc->DefineSection(1,-250.6,258.,269.6);
237   //
238   tofc->DefineSection(2,-250.6,258.,260.0676); 
239   tofc->DefineSection(3,250.6,258.,260.0676);
240   //
241   tofc->DefineSection(4,250.6,258.,275.5);
242   tofc->DefineSection(5,253.6,258.,275.5);
243   //
244   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
245   //sandwich
246   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
247   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
248   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
249   //
250   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
251   //
252   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
253   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
254   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
255   //
256   // outer part - positioning
257   //
258   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
259   //
260   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
261   //
262   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
263   //
264   v2->AddNode(v3,1); v2->AddNode(v4,1); 
265   //
266   v1->AddNode(v2,1);
267   //--------------------------------------------------------------------
268   // Tpc Inner INsulator (CO2) 
269   // the cones, the central drum and the inner f.c. sandwich with a piece
270   // of the flane will be placed in the TPC
271   //--------------------------------------------------------------------
272   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
273   //
274   tpci->DefineSection(0,-253.6,68.4,76.6774);
275   tpci->DefineSection(1,-74.0,61.2,76.6774);
276   //
277   tpci->DefineSection(2,74.0,61.2,76.6774);  
278   //
279   tpci->DefineSection(3,253.6,65.9,76.6774);
280   //
281   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
282   //
283   // now the inner field cage - only part of flanges (2 copies)
284   //
285   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
286   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
287   //
288  //---------------------------------------------------------
289   // Tpc Inner Containment vessel - Muon side
290   //---------------------------------------------------------
291   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
292   //
293   tcms->DefineSection(0,-259.1,68.1,74.2);
294   tcms->DefineSection(1,-253.6,68.1,74.2);
295   //
296   tcms->DefineSection(2,-253.6,68.1,68.4);
297   tcms->DefineSection(3,-74.0,60.9,61.2);
298   //
299   tcms->DefineSection(4,-74.0,60.1,61.2);
300   tcms->DefineSection(5,-73.3,60.1,61.2);
301   //
302   tcms->DefineSection(6,-73.3,56.9,61.2);
303   tcms->DefineSection(7,-73.0,56.9,61.2);
304   //
305   tcms->DefineSection(8,-73.0,56.9,58.8);
306   tcms->DefineSection(9,-71.3,56.9,58.8);
307   //
308   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
309   //-----------------------------------------------
310   // inner containment vessel - shaft side
311   //-----------------------------------------------
312   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
313   //
314   tcss->DefineSection(0,71.3,56.9,58.8);
315   tcss->DefineSection(1,73.0,56.9,58.8);
316   //
317   tcss->DefineSection(2,73.0,56.9,61.2);
318   tcss->DefineSection(3,73.3,56.9,61.2);
319   //  
320   tcss->DefineSection(4,73.3,60.1,61.2);
321   tcss->DefineSection(5,74.0,60.1,61.2);
322   //
323   tcss->DefineSection(6,74.0,60.9,61.2);
324   tcss->DefineSection(7,253.6,65.6,65.9);
325   //
326   tcss->DefineSection(8,253.6,65.6,74.2);
327   tcss->DefineSection(9,258.1,65.6,74.2);
328   //
329   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
330   //-----------------------------------------------
331   //  Inner field cage
332   //  define 4 parts and make an assembly
333   //-----------------------------------------------
334   // part1 - Al - 2 copies
335   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
336   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
337   // sandwich - outermost parts - 2 copies
338   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
339   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
340   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
341   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
342   //
343   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
344   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
345   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
346   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
347   //
348   // middle parts - 2 copies
349   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
350   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
351   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
352   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
353   //
354   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
355   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
356   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
357   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
358   // central part - 1 copy
359   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns 
360   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
361   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
362   //
363   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
364   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
365   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
366   //
367   // inner part - positioning
368   //
369   // creating a sandwich
370   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
371   //
372   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
373   //
374   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
375   //
376   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
377   //
378   tv100->AddNode(tv10,1);
379   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
380   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
381   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
382   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
383   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
384   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
385   //
386   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
387   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
388   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
389   v9->AddNode(tv100,1);
390   //
391   // central drum 
392   //
393   // flange + sandwich
394   //
395   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
396   cfl->DefineSection(0,-71.1,59.7,61.2);
397   cfl->DefineSection(1,-68.6,59.7,61.2);
398   //
399   cfl->DefineSection(2,-68.6,60.6324,61.2);
400   cfl->DefineSection(3,68.6,60.6324,61.2); 
401   //
402   cfl->DefineSection(4,68.6,59.7,61.2);
403   cfl->DefineSection(5,71.1,59.7,61.2);  
404   //
405   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
406   // sandwich
407   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
408   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
409   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);  
410   //
411   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
412   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
413   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
414   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
415   //
416   // seals for central drum 2 copies
417   //
418   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
419   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
420   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
421   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
422   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
423   //
424   // seal collars 
425   TGeoPcon *se = new TGeoPcon(0.,360.,6);
426   se->DefineSection(0,-72.8,59.7,61.2);
427   se->DefineSection(1,-72.3,59.7,61.2);
428   //
429   se->DefineSection(2,-72.3,58.85,61.2);
430   se->DefineSection(3,-71.6,58.85,61.2); 
431   //
432   se->DefineSection(4,-71.6,59.7,61.2);
433   se->DefineSection(5,-71.3,59.7,61.2);  
434   //
435   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
436   //
437   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
438   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
439   //
440   // define reflection matrix 
441   //
442   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
443   //
444   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
445   //
446   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
447   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
448   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
449   //
450   // central membrane - 2 rings and a mylar membrane - assembly
451   //
452   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
453   TGeoTube *oh = new TGeoTube(250.,256.,.5);
454   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
455   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
456   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
457   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
458   //
459   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
460   cm->AddNode(ihv,1);
461   cm->AddNode(ohv,1);
462   cm->AddNode(memv,1);
463   v9->AddNode(cm,1);
464   //
465   // end caps - they are make as an assembly of single segments
466   // containing both readout chambers
467   //
468   Double_t openingAngle = 10.*TMath::DegToRad();
469   Double_t thick=1.5; // rib
470   Double_t shift = thick/TMath::Sin(openingAngle);
471   //
472   Double_t lowEdge = 86.3; // hole in the wheel
473   Double_t upEdge = 240.4; // hole in the wheel
474   //
475   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
476   //
477   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
478   //
479   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
480   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
481   //
482   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
483   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
484   //
485   Double_t ys = shift*TMath::Sin(openingAngle); 
486   Double_t xs = shift*TMath::Cos(openingAngle);
487   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
488   tr->RegisterYourself();
489   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
490   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
491   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
492   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
493   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
494   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
495   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
496   //
497   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
498   //
499   // readout chambers
500   //
501   // IROC first
502   //
503    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
504    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
505   // empty space
506    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
507    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
508    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
509    //bars
510    Double_t tga = (19.8328-12.3742)/39.3;
511    Double_t xmin,xmax;
512    xmin = 9.55*tga+12.3742;
513    xmax = 9.95*tga+12.3742;
514    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
515    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
516    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
517    xmin=19.4*tga+12.3742;
518    xmax=19.9*tga+12.3742;
519    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
520    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
521    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
522    xmin=29.35*tga+12.3742;
523    xmax=29.75*tga+12.3742;
524    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
525    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
526    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
527    //
528    // holes for connectors
529    //
530    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
531    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
532    TString fileName(gSystem->Getenv("ALICE_ROOT"));
533    fileName += "/TPC/conn_iroc.dat";
534    ifstream in;
535    in.open(fileName.Data(), ios_base::in); // asci file
536    for(Int_t i =0;i<86;i++){
537       Double_t y = 3.99;
538       Double_t x,z,ang;
539       in>>x>>z>>ang;
540       z-=26.5;
541       TGeoRotation *rrr = new TGeoRotation();
542       rrr->RotateY(ang);
543       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
544       ibdv->AddNode(connv,i+1,trans);
545    }
546    in.close();
547    // "cap"
548    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
549    // "hole"
550    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
551    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
552    tr1->RegisterYourself();
553    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
554    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
555    //
556    // pad plane and wire fixations
557    //
558    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
559    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
560    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
561    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
562    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
563    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
564    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
565    //
566    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
567    //
568    iroc->AddNode(ibdv,1);
569    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
570    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
571    tga =(23.3521-14.5974)/49.65; 
572    Double_t xx = 24.825*tga+14.5974-0.6;
573    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
574    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
575    //
576    // OROC
577    //
578    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
579    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
580    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
581    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
582    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
583    //horizontal bars
584    tga=(38.5084-20.2938)/99.3;
585    xmin=tga*10.2+20.2938;
586    xmax=tga*10.6+20.2938;
587    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
588    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
589    //
590    xmin=22.55*tga+20.2938;
591    xmax=24.15*tga+20.2938;
592    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
593    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
594    //
595    xmin=36.1*tga+20.2938;
596    xmax=36.5*tga+20.2938;
597    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
598    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
599    //
600    xmin=49.0*tga+20.2938;
601    xmax=50.6*tga+20.2938;   
602    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
603    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
604    //
605    xmin=63.6*tga+20.2938;
606    xmax=64.0*tga+20.2938;
607    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
608    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
609    //
610    xmin=75.5*tga+20.2938;
611    xmax=77.15*tga+20.2938;
612    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
613    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
614    //
615    xmin=88.7*tga+20.2938;
616    xmax=89.1*tga+20.2938;
617    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
618    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
619    //
620    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
621    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
622    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
623    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
624    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
625    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
626    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
627    // vertical bars
628    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
629    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
630    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
631    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
632    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
633    //
634    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
635    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
636    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
637    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
638    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
639    //
640    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
641    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
642    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
643    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
644    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
645    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
646    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
647    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
648    //
649    // holes for connectors
650    //
651    fileName = gSystem->Getenv("ALICE_ROOT");
652    fileName += "/TPC/conn_oroc.dat";
653    in.open(fileName.Data(), ios_base::in); // asci file
654    for(Int_t i =0;i<78;i++){
655       Double_t y =3.89;
656       Double_t x,z,ang;
657       Double_t x1,z1,x2,z2;
658       in>>x>>z>>ang;        
659       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
660       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
661       //
662       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
663       //
664       TGeoRotation *rr = new TGeoRotation();
665       rr->RotateY(ang); 
666       z1-=54.95;
667       z2-=54.95;
668       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
669       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
670       obdv->AddNode(connv,i+1,trans1);
671       obdv->AddNode(connv,i+79,trans2);
672    }
673    in.close();
674    // cap
675    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
676    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
677    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
678    tr5->RegisterYourself();
679    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
680    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
681    //
682    // pad plane and wire fixations
683    //
684    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
685    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
686    //
687    tga=(43.5239-23.3874)/114.2;
688    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
689    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
690    xx = 57.1*tga+23.3874-0.7;
691    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
692    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
693    //
694    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
695    //
696    oroc->AddNode(obdv,1);
697    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
698    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
699    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
700    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
701    // 
702    // now iroc and oroc are placed into a sector...
703    //
704    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
705    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
706    TGeoRotation rot1("rot1",90.,90.,0.);
707    TGeoRotation rot2("rot2");
708    rot2.RotateY(10.);
709    TGeoRotation *rot = new TGeoRotation("rot");
710    *rot=rot1*rot2;
711    //
712    Double_t x0,y0;
713    x0=110.2*TMath::Cos(openingAngle);
714    y0=110.2*TMath::Sin(openingAngle);
715    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side 
716    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
717    x0=188.45*TMath::Cos(openingAngle);
718    y0=188.45*TMath::Sin(openingAngle);
719    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
720    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
721    //
722    // A-side
723    //
724    secta->AddNode(ch,1);
725    secta->AddNode(iroc,1,combi1a);
726    secta->AddNode(oroc,1,combi2a);
727    //
728    // C-side
729    //
730    sectc->AddNode(ch,1);
731    sectc->AddNode(iroc,1,combi1c);
732    sectc->AddNode(oroc,1,combi2c);
733    //
734    // now I try to make  wheels...
735    //
736    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
737    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
738    //
739    for(Int_t i =0;i<18;i++){
740      Double_t phi = (20.*i);
741      TGeoRotation *r = new TGeoRotation();
742      r->RotateZ(phi);
743      wheela->AddNode(secta,i+1,r);
744      wheelc->AddNode(sectc,i+1,r); 
745     
746    }
747    // wheels in the drift volume!
748    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
749    v9->AddNode(wheela,1,combi3);
750    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
751    
752    //_____________________________________________________________
753    // service support wheel
754    //_____________________________________________________________
755   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
756   sw->DefineSection(0,-4.,80.5,251.75);
757   sw->DefineSection(1,4.,80.5,251.75); 
758   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
759   //
760   thick=1.;
761   shift = thick/TMath::Sin(openingAngle);
762   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
763   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
764   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
765   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
766   //
767   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
768   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
769   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
770   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
771   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
772   //
773   shv->AddNode(elv,1);
774   //
775   //
776   ys = shift*TMath::Sin(openingAngle);
777   xs = shift*TMath::Cos(openingAngle);
778   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
779   // cover
780   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
781   co->DefineSection(0,-0.5,77.,255.25);
782   co->DefineSection(1,0.5,77.,255.25);
783   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
784   // hole in a cover
785   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
786   shift=4./TMath::Sin(openingAngle);
787   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
788   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
789   //
790   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
791   //
792   ys = shift*TMath::Sin(openingAngle);
793   xs = shift*TMath::Cos(openingAngle);  
794   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
795   //
796   // Sector as an Assembly
797   //
798   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
799   swhs->AddNode(swv,1);
800   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
801   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
802   //
803   // SSW as an Assembly of sectors
804   //
805  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
806    for(Int_t i =0;i<18;i++){
807      Double_t phi = (20.*i);
808      TGeoRotation *r = new TGeoRotation();
809      r->RotateZ(phi);
810      swheel->AddNode(swhs,i+1,r);   
811    }
812    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
813    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
814
815    // sensitive strips 
816    TGeoMedium *m8 = gGeoManager->GetMedium("TPC_Ne-CO2-2");
817    Int_t totrows;
818    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
819    Double_t *upar;
820    upar=NULL;
821    gGeoManager->Volume("TPC_Strip","PGON",m8->GetId(),upar);
822    upar=new Double_t [10];
823    upar[0]=0.;
824    upar[1]=360.;
825    upar[2]=18.;
826    upar[3]=2.;
827    //
828    upar[4]=-124.8;
829    upar[7]=124.8;
830
831    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
832
833    upar[5]=rlow;
834    upar[6]=rlow+.01;
835    upar[8]=upar[5];
836    upar[9]=upar[6];
837    //
838    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
839    gGeoManager->Node("TPC_Strip",totrows+1,
840                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
841    //
842    // now, strips 
843    //
844      //lower sectors
845      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
846        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
847        upar[5]=rlow;
848        upar[6]=rlow+.01;
849        upar[8]=upar[5];
850        upar[9]=upar[6];
851        gGeoManager->Node("TPC_Strip",i,
852                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
853        gGeoManager->Node("TPC_Strip",totrows+i,
854                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);       
855      }
856      //upper sectors
857      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
858        rlow=fTPCParam->GetPadRowRadiiUp(i-1); 
859        upar[5]=rlow;
860        upar[6]=rlow+.01;
861        upar[8]=upar[5];
862        upar[9]=upar[6];
863        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
864                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10); 
865        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
866                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10); 
867      }
868    
869   //----------------------------------------------------------
870   // TPc Support Rods - MAKROLON
871   //----------------------------------------------------------
872   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
873   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
874   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
875   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
876   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
877   // upper and lower rods differ in length!
878   delete [] upar;
879   upar=NULL;
880   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
881   upar=new Double_t [3];
882   upar[0]=1.8;
883   upar[1]=2.2;
884   
885   //
886   //HV rods - makrolon + 0.58cm (diameter) Cu
887   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
888   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
889   //
890   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
891   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
892   hvrv->AddNode(hvcv,1);
893   //
894   // resistor rods
895   //
896   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
897   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
898   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
899   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
900   //
901   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
902   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
903   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
904   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
905   //
906   // ceramic rod with water
907   //
908   criv->AddNode(cwiv,1); 
909   crov->AddNode(cwov,1);
910   //
911   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
912   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
913   //
914   // peek rod
915   //
916   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
917   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
918   //
919   // resistor rods assembly
920   //
921    TGeoRotation *rotr = new TGeoRotation("rotr");
922    rotr->RotateZ(-21.);
923   //
924   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
925   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
926   //
927   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
928   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
929   //
930   //
931   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
932   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
933   rrin->AddNode(rriv,1);
934   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
935   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.)); 
936   rrin->AddNode(priv,1); 
937   //
938   rrou->AddNode(rrov,1);
939   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
940   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.)); 
941   rrou->AddNode(prov,1);   
942   for(Int_t i=0;i<18;i++){
943     Double_t angle,x,y;
944     Double_t z,r; 
945     angle=TMath::DegToRad()*20.*(Double_t)i;
946     r=81.5;
947     x=r * TMath::Cos(angle);
948     y=r * TMath::Sin(angle);
949     upar[2]=126.64; //lower
950     z= 126.96;
951     if(i==3){
952       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
953       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C     
954     } 
955     else { 
956       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
957       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
958     }
959
960     //
961     r=254.25;
962     x=r * TMath::Cos(angle);
963     y=r * TMath::Sin(angle);
964     upar[2]=126.54; //upper
965     z=127.06;
966     //
967     if(i==15){
968       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
969      v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
970       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
971     }
972     else if(i==11){
973       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
974       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
975     }
976     else{
977     //
978       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
979       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
980     }
981     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
982     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
983   }
984
985   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
986   alice->AddNode(v1,1);
987
988 } // end of function
989
990
991 //_____________________________________________________________________________
992 void AliTPCv1::CreateMaterials()
993 {
994   //
995   // Define materials for Time Projection Chamber
996   //
997   AliTPC::CreateMaterials();
998 }
999
1000 //_____________________________________________________________________________
1001 void AliTPCv1::Init()
1002 {
1003   //
1004   // Initialises TPC detector after it has been created
1005   //
1006
1007   fIdSens=gMC->VolId("TPC_Strip"); // sensitive strip
1008
1009   printf("%s: *** TPC version 1 initialized***\n",ClassName());
1010
1011   // printf("TPC version 1 initialized\n");
1012 }
1013
1014 //_____________________________________________________________________________
1015 void AliTPCv1::StepManager()
1016 {
1017   //
1018   // Called at every step in the Time Projection Chamber
1019   //
1020   Int_t         copy, id, i;
1021   Float_t       hits[5];
1022   Int_t         vol[2];
1023   TLorentzVector p;
1024  //
1025
1026   id = gMC->CurrentVolID(copy);
1027   if(id!=fIdSens) return;
1028   if(gMC->TrackCharge() && gMC->IsTrackEntering()) {
1029
1030     // 
1031     // Only charged tracks entering the sensitive volume
1032     //
1033
1034       gMC->TrackPosition(p);
1035   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1036   //
1037   
1038   //
1039   Double_t angle = TMath::ACos(p[0]/r);  
1040   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1041   //
1042   // angular segment, it is not a real sector number...
1043   //
1044   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1045                fTPCParam->GetInnerAngle());
1046   // rotate to segment "0"
1047   Float_t cos,sin;
1048   fTPCParam->AdjustCosSin(sector,cos,sin);
1049   Float_t x1 = p[0]*cos + p[1]*sin;
1050   Float_t y1 = TMath::Abs(-p[0]*sin + p[1]*cos);
1051   // calculate real sector number...
1052   if (x1>fTPCParam->GetOuterRadiusLow()){
1053     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1054              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1055     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1056   }
1057     else   
1058       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1); 
1059   //
1060   // here I have a sector number
1061   //
1062   vol[0]=sector;
1063   //
1064   Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1065   vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1066   // row numbers are autonomous for lower and upper sectors
1067   if(vol[0] > fTPCParam->GetNInnerSector()) {
1068      vol[1] -= fTPCParam->GetNRowLow();
1069   }
1070   Double_t range = (sector<36) ? fTPCParam->GetYInner(vol[1]) :
1071                    fTPCParam->GetYOuter(vol[1]);
1072   if(y1>range) return;
1073      if(vol[1] == 0){
1074   
1075         // because Jouri wants to have this
1076
1077         gMC->TrackMomentum(p);
1078         hits[0]=p[0];
1079         hits[1]=p[1];
1080         hits[2]=p[2];
1081         hits[3]=0.; // this hit has no energy loss
1082         // Get also the track time for pileup simulation
1083         hits[4]=gMC->TrackTime();
1084
1085         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.
1086      }
1087    gMC->TrackPosition(p);
1088       for(i=0;i<3;++i) hits[i]=p[i];
1089       hits[3]=1; //I'd like to have something positive here (I.Belikov)
1090       // Get also the track time for pileup simulation
1091       hits[4]=gMC->TrackTime();
1092
1093       AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits); // M.I.    
1094
1095   }// track entering sensitive strip
1096    
1097 }
1098 //_____________________________________________________________________________
1099
1100
1101