1130e14660c60fd9e4515073f59ec1c0f5647740
[u/mrichter/AliRoot.git] / TPC / AliTPCv0.cxx
1 /**************************************************************************
2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
5  * Contributors are mentioned in the code where appropriate.              *
6  *                                                                        *
7  * Permission to use, copy, modify and distribute this software and its   *
8  * documentation strictly for non-commercial purposes is hereby granted   *
9  * without fee, provided that the above copyright notice appears in all   *
10  * copies and that both the copyright notice and this permission notice   *
11  * appear in the supporting documentation. The authors make no claims     *
12  * about the suitability of this software for any purpose. It is          *
13  * provided "as is" without express or implied warranty.                  *
14  **************************************************************************/
15
16 /* $Id$ */
17 //
18
19 ///////////////////////////////////////////////////////////////////////////////
20 //                                                                           //
21 //  Time Projection Chamber version 0 -- "coarse" TPC                        //
22 //                                                                           //
23 //Begin_Html
24 /*
25 <img src="picts/AliTPCv0Class.gif">
26 */
27 //End_Html
28 //                                                                           //
29 //                                                                           //
30 ///////////////////////////////////////////////////////////////////////////////
31
32 #include <Riostream.h>
33
34 #include <TMath.h>
35 #include <TVirtualMC.h>
36 #include <TString.h>
37 #include <TSystem.h>
38
39 #include "AliConst.h"
40 #include "AliRun.h"
41 #include "AliTPCDigitsArray.h"
42 #include "AliTPCParamSR.h"
43 #include "AliTPCv0.h"
44 #include "TGeoManager.h"
45 #include "TGeoVolume.h"
46 #include "TGeoPcon.h"
47 #include "TGeoCone.h"
48 #include "TGeoTube.h"
49 #include "TGeoPgon.h"
50 #include "TGeoTrd1.h"
51 #include "TGeoCompositeShape.h"
52 #include "TGeoPara.h"
53
54 using std::ifstream;
55 using std::ios_base;
56 ClassImp(AliTPCv0)
57  
58 //_____________________________________________________________________________
59 AliTPCv0::AliTPCv0(const char *name, const char *title) 
60          :AliTPC(name, title)
61 {
62   //
63   // Standard creator for TPC version 0
64   //
65
66
67   if (fTPCParam)
68      fTPCParam->Write(fTPCParam->GetTitle());
69 }
70
71 //_____________________________________________________________________________
72
73 void AliTPCv0::CreateGeometry()
74 {
75
76   //
77   // Creation of the TPC version 0, i.e. no sensitive volumes,
78   // only the material distribution
79   //
80   //Begin_Html
81   /*
82     <img src="picts/AliTPC.gif">
83   */
84   //End_Html
85   //Begin_Html
86   /*
87     <img src="picts/AliTPCv0Tree.gif">
88   */
89   //End_Html
90
91  //----------------------------------------------------------
92   // This geometry is written using TGeo class
93   // Firstly the shapes are defined, and only then the volumes
94   // What is recognized by the MC are volumes
95   //----------------------------------------------------------
96   //
97   //  tpc - this will be the mother volume
98   //
99
100   //
101   // here I define a volume TPC
102   // retrive the medium name with "TPC_" as a leading string
103   //
104   TGeoPcon *tpc = new TGeoPcon(0.,360.,30); //30 sections
105   //
106   tpc->DefineSection(0,-289.6,77.,278.);
107   tpc->DefineSection(1,-262.1,77.,278.);
108   //
109   tpc->DefineSection(2,-262.1,83.1,278.);
110   tpc->DefineSection(3,-260.,83.1,278.);
111   //
112   tpc->DefineSection(4,-260.,70.,278.);    
113   tpc->DefineSection(5,-259.6,70.,278.);
114   //
115   tpc->DefineSection(6,-259.6,68.1,278.);
116   tpc->DefineSection(7,-253.6,68.1,278.);
117   //
118   tpc->DefineSection(8,-253.6,67.88,278.);//hs
119   tpc->DefineSection(9,-74.0,60.68,278.);// hs
120   //
121   tpc->DefineSection(10,-74.0,60.1,278.);
122   tpc->DefineSection(11,-73.3,60.1,278.);
123   //
124   tpc->DefineSection(12,-73.3,56.9,278.); 
125   tpc->DefineSection(13,-68.5,56.9,278.);
126   //
127   tpc->DefineSection(14,-68.5,60.,278.);
128   tpc->DefineSection(15,-64.7,60.,278.);
129   //
130   tpc->DefineSection(16,-64.7,56.9,278.); 
131   tpc->DefineSection(17,73.3,56.9,278.);
132   //
133   tpc->DefineSection(18,73.3,60.1,278.);
134   tpc->DefineSection(19,74.0,60.1,278.);
135   //
136   tpc->DefineSection(20,74.0,60.68,278.);// hs
137   tpc->DefineSection(21,253.6,65.38,278.);// hs
138   //
139   tpc->DefineSection(22,253.6,65.6,278.);
140   tpc->DefineSection(23,259.6,65.6,278.);
141   //
142   tpc->DefineSection(24,259.6,70.0,278.);
143   tpc->DefineSection(25,260.,70.0,278.);
144   //
145   tpc->DefineSection(26,260.,83.1,278.);
146   tpc->DefineSection(27,262.1,83.1,278.);
147   //
148   tpc->DefineSection(28,262.1,77.,278);
149   tpc->DefineSection(29,289.6,77.,278.);
150   //
151   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
152   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
153   //
154   // drift volume - sensitive volume, extended beyond the
155   // endcaps, because of the alignment
156   //
157   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
158   dvol->DefineSection(0,-260.,74.5,264.4);
159   dvol->DefineSection(1,-253.6,74.5,264.4);
160   //
161   dvol->DefineSection(2,-253.6,76.6774,258.);
162   dvol->DefineSection(3,253.6,76.6774,258.); 
163   //
164   dvol->DefineSection(4,253.6,74.5,264.4);
165   dvol->DefineSection(5,260.,74.5,264.4);
166   //
167   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-1");
168   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
169   //
170   v1->AddNode(v9,1);
171   //
172   // outer insulator
173   //
174   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
175   //
176   tpco->DefineSection(0,-256.6,264.8,278.);
177   tpco->DefineSection(1,-253.6,264.8,278.);
178   //
179   tpco->DefineSection(2,-253.6,258.,278.);
180   tpco->DefineSection(3,250.6,258.,278.);
181   //
182   tpco->DefineSection(4,250.6,258.,275.5);
183   tpco->DefineSection(5,253.6,258.,275.5);
184   //
185   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
186   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
187   //
188   // outer containment vessel
189   //
190   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
191   //
192   tocv->DefineSection(0,-256.6,264.8,278.);
193   tocv->DefineSection(1,-253.6,264.8,278.);
194   //
195   tocv->DefineSection(2,-253.6,274.8124,278.);
196   tocv->DefineSection(3,247.6,274.8124,278.);  
197   //
198   tocv->DefineSection(4,247.6,270.4,278.);
199   tocv->DefineSection(5,250.6,270.4,278.);
200   //
201   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
202   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
203   //
204   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
205   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
206   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
207   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
208   //
209   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
210   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
211   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
212   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
213   //
214   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
215   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
216   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
217   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
218   TGeoMedium *mhs = gGeoManager->GetMedium("TPC_Steel");
219   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
220   //-------------------------------------------------------
221   //  Tpc Outer Field Cage
222   //  daughters - composite (sandwich)
223   //-------------------------------------------------------
224
225   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
226   //
227   tofc->DefineSection(0,-253.6,258.,269.6);
228   tofc->DefineSection(1,-250.6,258.,269.6);
229   //
230   tofc->DefineSection(2,-250.6,258.,260.0676); 
231   tofc->DefineSection(3,250.6,258.,260.0676);
232   //
233   tofc->DefineSection(4,250.6,258.,275.5);
234   tofc->DefineSection(5,253.6,258.,275.5);
235   //
236   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
237   //sandwich
238   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
239   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
240   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
241   //
242   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
243   //
244   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
245   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
246   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
247   //
248   // outer part - positioning
249   //
250   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
251   //
252   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
253   //
254   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
255   //
256   v2->AddNode(v3,1); v2->AddNode(v4,1); 
257   //
258   v1->AddNode(v2,1);
259   //-----------------------------------------------------------
260   //--------------------------------------------------------------------
261   // Tpc Inner INsulator (CO2) 
262   // the cones, the central drum and the inner f.c. sandwich with a piece
263   // of the flane will be placed in the TPC
264   //--------------------------------------------------------------------
265   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
266   //
267   tpci->DefineSection(0,-253.6,68.4,76.6774);
268   tpci->DefineSection(1,-74.0,61.2,76.6774);
269   //
270   tpci->DefineSection(2,74.0,61.2,76.6774);  
271   //
272   tpci->DefineSection(3,253.6,65.9,76.6774);
273   //
274   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
275   //
276   // now the inner field cage - only part of flanges (2 copies)
277   //
278   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
279   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
280   //
281  //---------------------------------------------------------
282   // Tpc Inner Containment vessel - Muon side
283   //---------------------------------------------------------
284   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
285   //
286   tcms->DefineSection(0,-259.1,68.1,74.2);
287   tcms->DefineSection(1,-253.6,68.1,74.2);
288   //
289   tcms->DefineSection(2,-253.6,68.1,68.4);
290   tcms->DefineSection(3,-74.0,60.9,61.2);
291   //
292   tcms->DefineSection(4,-74.0,60.1,61.2);
293   tcms->DefineSection(5,-73.3,60.1,61.2);
294   //
295   tcms->DefineSection(6,-73.3,56.9,61.2);
296   tcms->DefineSection(7,-73.0,56.9,61.2);
297   //
298   tcms->DefineSection(8,-73.0,56.9,58.8);
299   tcms->DefineSection(9,-71.3,56.9,58.8);
300   //
301   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
302   //------------------------------------------------
303   //  Heat screen muon side
304   //------------------------------------------------
305  
306   TGeoCone *thsm = new TGeoCone(89.8,67.88,68.1,60.68,60.9);
307   TGeoCone *thsmw = new TGeoCone(89.8,67.94,68.04,60.74,60.84);
308   TGeoVolume *hvsm = new TGeoVolume("TPC_HSM",thsm,mhs); //steel
309   TGeoVolume *hvsmw = new TGeoVolume("TPC_HSMW",thsmw,m12); //water 
310   // assembly heat screen muon
311   hvsm->AddNode(hvsmw,1);
312   //-----------------------------------------------
313   // inner containment vessel - shaft side
314   //-----------------------------------------------
315   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
316   //
317   tcss->DefineSection(0,71.3,56.9,58.8);
318   tcss->DefineSection(1,73.0,56.9,58.8);
319   //
320   tcss->DefineSection(2,73.0,56.9,61.2);
321   tcss->DefineSection(3,73.3,56.9,61.2);
322   //  
323   tcss->DefineSection(4,73.3,60.1,61.2);
324   tcss->DefineSection(5,74.0,60.1,61.2);
325   //
326   tcss->DefineSection(6,74.0,60.9,61.2);
327   tcss->DefineSection(7,253.6,65.6,65.9);
328   //
329   tcss->DefineSection(8,253.6,65.6,74.2);
330   tcss->DefineSection(9,258.1,65.6,74.2);
331   //
332   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
333   //-------------------------------------------------
334   //  Heat screen shaft side
335   //--------------------------------------------------
336   TGeoCone *thss = new TGeoCone(89.8,60.68,60.9,65.38,65.6);       
337   TGeoCone *thssw = new TGeoCone(89.8,60.74,60.84,65.44,65.54);     
338   TGeoVolume *hvss = new TGeoVolume("TPC_HSS",thss,mhs); //steel
339   TGeoVolume *hvssw = new TGeoVolume("TPC_HSSW",thssw,m12); //water 
340   //assembly heat screen shaft
341   hvss->AddNode(hvssw,1);
342   //-----------------------------------------------
343   //  Inner field cage
344   //  define 4 parts and make an assembly
345   //-----------------------------------------------
346   // part1 - Al - 2 copies
347   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
348   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
349   // sandwich - outermost parts - 2 copies
350   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
351   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
352   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
353   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
354   //
355   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
356   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
357   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
358   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
359   //
360   // middle parts - 2 copies
361   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
362   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
363   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
364   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
365   //
366   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
367   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
368   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
369   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
370   // central part - 1 copy
371   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns 
372   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
373   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
374   //
375   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
376   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
377   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
378   //
379   // inner part - positioning
380   //
381   // creating a sandwich
382   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
383   //
384   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
385   //
386   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
387   //
388   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
389   //
390   tv100->AddNode(tv10,1);
391   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
392   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
393   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
394   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
395   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
396   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
397   //
398   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
399   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
400   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
401   v1->AddNode(hvsm,1,new TGeoTranslation(0.,0.,-163.8)); 
402   v1->AddNode(hvss,1,new TGeoTranslation(0.,0.,163.8)); 
403   v9->AddNode(tv100,1);
404   //
405   // central drum 
406   //
407   // flange + sandwich
408   //
409   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
410   cfl->DefineSection(0,-71.1,59.7,61.2);
411   cfl->DefineSection(1,-68.6,59.7,61.2);
412   //
413   cfl->DefineSection(2,-68.6,60.6324,61.2);
414   cfl->DefineSection(3,68.6,60.6324,61.2); 
415   //
416   cfl->DefineSection(4,68.6,59.7,61.2);
417   cfl->DefineSection(5,71.1,59.7,61.2);  
418   //
419   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
420   // sandwich
421   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
422   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
423   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);  
424   //
425   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
426   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
427   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
428   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
429   //
430   // seals for central drum 2 copies
431   //
432   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
433   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
434   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
435   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
436   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
437   //
438   // seal collars 
439   TGeoPcon *se = new TGeoPcon(0.,360.,6);
440   se->DefineSection(0,-72.8,59.7,61.2);
441   se->DefineSection(1,-72.3,59.7,61.2);
442   //
443   se->DefineSection(2,-72.3,58.85,61.2);
444   se->DefineSection(3,-71.6,58.85,61.2); 
445   //
446   se->DefineSection(4,-71.6,59.7,61.2);
447   se->DefineSection(5,-71.3,59.7,61.2);  
448   //
449   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
450   //
451   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
452   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
453   //
454   // define reflection matrix 
455   //
456   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
457   //
458   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
459   //
460   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
461   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
462   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
463   //
464   // central membrane - 2 rings and a mylar membrane - assembly
465   //
466   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
467   TGeoTube *oh = new TGeoTube(250.,256.,.5);
468   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
469   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
470   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
471   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
472   //
473   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
474   cm->AddNode(ihv,1);
475   cm->AddNode(ohv,1);
476   cm->AddNode(memv,1);
477   v9->AddNode(cm,1);
478   //
479   // end caps - they are make as an assembly of single segments
480   // containing both readout chambers
481   //
482   Double_t openingAngle = 10.*TMath::DegToRad();
483   Double_t thick=1.5; // rib
484   Double_t shift = thick/TMath::Sin(openingAngle);
485   //
486   Double_t lowEdge = 86.3; // hole in the wheel
487   Double_t upEdge = 240.4; // hole in the wheel
488   //
489   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
490   //
491   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
492   //
493   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
494   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
495   //
496   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
497   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
498   //
499   Double_t ys = shift*TMath::Sin(openingAngle); 
500   Double_t xs = shift*TMath::Cos(openingAngle);
501   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
502   tr->RegisterYourself();
503   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
504   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
505   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
506   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
507   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
508   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
509   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
510   //
511   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
512   //
513   // readout chambers
514   //
515   // IROC first
516   //
517    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
518    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
519   // empty space
520    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
521    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
522    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
523    //bars
524    Double_t tga = (19.8328-12.3742)/39.3;
525    Double_t xmin,xmax;
526    xmin = 9.55*tga+12.3742;
527    xmax = 9.95*tga+12.3742;
528    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
529    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
530    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
531    xmin=19.4*tga+12.3742;
532    xmax=19.9*tga+12.3742;
533    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
534    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
535    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
536    xmin=29.35*tga+12.3742;
537    xmax=29.75*tga+12.3742;
538    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
539    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
540    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
541    //
542    // holes for connectors
543    //
544    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
545    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
546    TString fileName(gSystem->Getenv("ALICE_ROOT"));
547    fileName += "/TPC/conn_iroc.dat";
548    ifstream in;
549    in.open(fileName.Data(), ios_base::in); // asci file
550    for(Int_t i =0;i<86;i++){
551       Double_t y = 3.99;
552       Double_t x,z,ang;
553       in>>x>>z>>ang;
554       z-=26.5;
555       TGeoRotation *rrr = new TGeoRotation();
556       rrr->RotateY(ang);
557       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
558       ibdv->AddNode(connv,i+1,trans);
559    }
560    in.close();
561    // "cap"
562    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
563    // "hole"
564    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
565    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
566    tr1->RegisterYourself();
567    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
568    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
569    //
570    // pad plane and wire fixations
571    //
572    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
573    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
574    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
575    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
576    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
577    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
578    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
579    //
580    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
581    //
582    iroc->AddNode(ibdv,1);
583    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
584    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
585    tga =(23.3521-14.5974)/49.65; 
586    Double_t xx = 24.825*tga+14.5974-0.6;
587    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
588    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
589    //
590    // OROC
591    //
592    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
593    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
594    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
595    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
596    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
597    //horizontal bars
598    tga=(38.5084-20.2938)/99.3;
599    xmin=tga*10.2+20.2938;
600    xmax=tga*10.6+20.2938;
601    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
602    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
603    //
604    xmin=22.55*tga+20.2938;
605    xmax=24.15*tga+20.2938;
606    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
607    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
608    //
609    xmin=36.1*tga+20.2938;
610    xmax=36.5*tga+20.2938;
611    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
612    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
613    //
614    xmin=49.0*tga+20.2938;
615    xmax=50.6*tga+20.2938;   
616    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
617    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
618    //
619    xmin=63.6*tga+20.2938;
620    xmax=64.0*tga+20.2938;
621    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
622    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
623    //
624    xmin=75.5*tga+20.2938;
625    xmax=77.15*tga+20.2938;
626    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
627    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
628    //
629    xmin=88.7*tga+20.2938;
630    xmax=89.1*tga+20.2938;
631    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
632    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
633    //
634    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
635    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
636    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
637    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
638    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
639    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
640    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
641    // vertical bars
642    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
643    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
644    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
645    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
646    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
647    //
648    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
649    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
650    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
651    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
652    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
653    //
654    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
655    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
656    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
657    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
658    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
659    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
660    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
661    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
662    //
663    // holes for connectors
664    //
665    fileName = gSystem->Getenv("ALICE_ROOT");
666    fileName += "/TPC/conn_oroc.dat";
667    in.open(fileName.Data(), ios_base::in); // asci file
668    for(Int_t i =0;i<78;i++){
669       Double_t y =3.89;
670       Double_t x,z,ang;
671       Double_t x1,z1,x2,z2;
672       in>>x>>z>>ang;        
673       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
674       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
675       //
676       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
677       //
678       TGeoRotation *rr = new TGeoRotation();
679       rr->RotateY(ang); 
680       z1-=54.95;
681       z2-=54.95;
682       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
683       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
684       obdv->AddNode(connv,i+1,trans1);
685       obdv->AddNode(connv,i+79,trans2);
686    }
687    in.close();
688    // cap
689    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
690    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
691    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
692    tr5->RegisterYourself();
693    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
694    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
695    //
696    // pad plane and wire fixations
697    //
698    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
699    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
700    //
701    tga=(43.5239-23.3874)/114.2;
702    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
703    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
704    xx = 57.1*tga+23.3874-0.7;
705    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
706    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
707    //
708    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
709    //
710    oroc->AddNode(obdv,1);
711    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
712    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
713    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
714    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
715    // 
716    // now iroc and oroc are placed into a sector...
717    //
718    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
719    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
720    //
721
722    TGeoRotation rot1("rot1",90.,90.,0.);
723    TGeoRotation rot2("rot2");
724    rot2.RotateY(10.);
725    TGeoRotation *rot = new TGeoRotation("rot");
726    *rot=rot1*rot2;
727    //
728    Double_t x0,y0;
729    x0=110.2*TMath::Cos(openingAngle);
730    y0=110.2*TMath::Sin(openingAngle);
731    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side 
732    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
733    x0=188.45*TMath::Cos(openingAngle);
734    y0=188.45*TMath::Sin(openingAngle);
735    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
736    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
737    //
738    // A-side
739    //
740    secta->AddNode(ch,1);
741    secta->AddNode(iroc,1,combi1a);
742    secta->AddNode(oroc,1,combi2a);
743    //
744    // C-side
745    //
746    sectc->AddNode(ch,1);
747    sectc->AddNode(iroc,1,combi1c);
748    sectc->AddNode(oroc,1,combi2c);
749    //
750    // now I try to make  wheels...
751    //
752    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
753    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
754    //
755    for(Int_t i =0;i<18;i++){
756      Double_t phi = (20.*i);
757      TGeoRotation *r = new TGeoRotation();
758      r->RotateZ(phi);
759      wheela->AddNode(secta,i+1,r);
760      wheelc->AddNode(sectc,i+1,r);    
761    }
762    // wheels in the drift volume!
763    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
764    v9->AddNode(wheela,1,combi3);
765    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
766    //_____________________________________________________________
767    // service support wheel
768    //_____________________________________________________________
769   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
770   sw->DefineSection(0,-4.,80.5,251.75);
771   sw->DefineSection(1,4.,80.5,251.75); 
772   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
773   //
774   thick=1.;
775   shift = thick/TMath::Sin(openingAngle);
776   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
777   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
778   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
779   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
780   //
781   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
782   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
783   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
784   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
785   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
786   //
787   shv->AddNode(elv,1);
788   //
789   //
790   ys = shift*TMath::Sin(openingAngle);
791   xs = shift*TMath::Cos(openingAngle);
792   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
793   // cover
794   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
795   co->DefineSection(0,-0.5,77.,255.25);
796   co->DefineSection(1,0.5,77.,255.25);
797   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
798   // hole in a cover
799   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
800   shift=4./TMath::Sin(openingAngle);
801   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
802   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
803   //
804   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
805   //
806   ys = shift*TMath::Sin(openingAngle);
807   xs = shift*TMath::Cos(openingAngle);  
808   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
809   //
810   // Sector as an Assembly
811   //
812   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
813   swhs->AddNode(swv,1);
814   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
815   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
816   //
817   // SSW as an Assembly of sectors
818   //
819  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
820    for(Int_t i =0;i<18;i++){
821      Double_t phi = (20.*i);
822      TGeoRotation *r = new TGeoRotation();
823      r->RotateZ(phi);
824      swheel->AddNode(swhs,i+1,r);   
825    }
826    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
827    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
828    //
829   //----------------------------------------------------------
830   // TPc Support Rods - MAKROLON
831   //----------------------------------------------------------
832   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
833   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
834   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
835   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
836   // upper and lower rods differ in length!
837   Double_t *upar;
838   upar=NULL;
839   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
840   upar=new Double_t [3];
841   upar[0]=1.8;
842   upar[1]=2.2;
843   
844   //
845   //HV rods - makrolon + 0.58cm (diameter) Cu
846   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
847   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
848   //
849   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
850   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
851   hvrv->AddNode(hvcv,1);
852   //
853   // resistor rods
854   //
855   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
856   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
857   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
858   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
859   //
860   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
861   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
862   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
863   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
864   //
865   // ceramic rod with water
866   //
867   criv->AddNode(cwiv,1); 
868   crov->AddNode(cwov,1);
869   //
870   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
871   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
872   //
873   // peek rod
874   //
875   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
876   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12);
877   //
878   // resistor rods assembly
879   //
880    TGeoRotation *rotr = new TGeoRotation("rotr");
881    rotr->RotateZ(-21.);
882   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
883   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
884   //
885   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
886   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
887   //
888   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
889   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
890   rrin->AddNode(rriv,1);
891   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
892   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.)); 
893   rrin->AddNode(priv,1); 
894   //
895   rrou->AddNode(rrov,1);
896   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
897   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.)); 
898   rrou->AddNode(prov,1); 
899   for(Int_t i=0;i<18;i++){
900     Double_t angle,x,y;
901     Double_t z,r; 
902     angle=TMath::DegToRad()*20.*(Double_t)i;
903     r=81.5;
904     x=r * TMath::Cos(angle);
905     y=r * TMath::Sin(angle);
906     upar[2]=126.64; //lower
907     z= 126.96;
908     if(i==3){
909       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
910       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C       
911     } 
912     else { 
913       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
914       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
915     }
916
917
918     //
919     r=254.25;
920     x=r * TMath::Cos(angle);
921     y=r * TMath::Sin(angle);
922     upar[2]=126.54; //upper
923     z=127.06;
924     //
925     if(i==15){
926       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
927       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
928       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
929     }
930     else if(i==11){
931       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
932       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
933     }
934     else{
935     //
936       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
937       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
938     }
939
940   }
941
942   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
943   alice->AddNode(v1,1);
944   
945
946 } // end of function
947
948
949
950 //_____________________________________________________________________________
951 void AliTPCv0::CreateMaterials()
952 {
953   //
954   // Define materials for the TPC
955   //
956   AliTPC::CreateMaterials();
957 }
958
959
960 //_____________________________________________________________________________
961 void AliTPCv0::Init()
962 {
963   //
964   // Initialise Time Projection Chamber version 0
965   //
966  
967   printf("%s: *** TPC version 0 initialized***\n",ClassName()); 
968
969   //  printf("TPC version 0 initialized\n");
970 }
971
972 //_____________________________________________________________________________
973 void AliTPCv0::StepManager()
974 {
975   //
976   // Procedure called at each step in the TPC
977   //
978 }