Corrected overlaps
[u/mrichter/AliRoot.git] / TPC / AliTPCv3.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 3 -- detailed TPC and slow simulation    //
22 //                                                                     
23 //Begin_Html
24 /*
25 <img src="picts/AliTPCv3Class.gif">
26 */
27 //End_Html
28 //                                                                           //
29 //                                                                           //
30 ///////////////////////////////////////////////////////////////////////////////
31
32 #include <stdlib.h>
33
34 #include <TInterpreter.h>
35 #include <TLorentzVector.h>
36 #include <TMath.h>
37 #include <TVirtualMC.h>
38 #include <TPDGCode.h>
39 #include <TString.h>
40 #include <TSystem.h>
41
42 #include "AliConst.h"
43 #include "AliRun.h"
44 #include "AliTPCDigitsArray.h"
45 #include "AliTPCParam.h"
46 #include "AliTPCParamSR.h"
47 #include "AliTPCTrackHitsV2.h"
48 #include "AliTPCv3.h"
49 #include "AliMC.h"
50 #include "TGeoManager.h"
51 #include "TGeoVolume.h"
52 #include "TGeoPcon.h"
53 #include "TGeoTube.h"
54 #include "TGeoPgon.h"
55 #include "TGeoTrd1.h"
56 #include "TGeoCompositeShape.h"
57 #include "TGeoPara.h"
58
59 ClassImp(AliTPCv3)
60 //_____________________________________________________________________________
61
62   AliTPCv3::AliTPCv3():AliTPC(),fIdSens(0)
63 {
64
65   fHitType = 1;
66
67
68
69 //_____________________________________________________________________________
70 AliTPCv3::AliTPCv3(const char *name, const char *title) :
71   AliTPC(name, title), fIdSens(0)
72 {
73   //
74   // Standard constructor for Time Projection Chamber version 3
75   //
76
77   SetBufferSize(128000);
78
79   if (fTPCParam)
80      fTPCParam->Write(fTPCParam->GetTitle());
81
82   fHitType =1;
83 }
84  
85 //_____________________________________________________________________________
86 void AliTPCv3::CreateGeometry()
87 {
88   //
89   // Creation of the TPC coarse geometry (version 3)
90   // The whole drift volume is sensitive
91   // Origin Marek Kowalski Cracow
92   //
93   //Begin_Html
94   /*
95     <img src="picts/AliTPCgif">
96   */
97   //End_Html
98   //Begin_Html
99   /*
100     <img src="picts/AliTPCv3Tree.gif">
101   */
102   //End_Html
103    //----------------------------------------------------------
104   // This geometry is written using TGeo class
105   // Firstly the shapes are defined, and only then the volumes
106   // What is recognized by the MC are volumes
107   //----------------------------------------------------------
108   //
109   //  tpc - this will be the mother volume
110   //
111
112   //
113   // here I define a volume TPC
114   // retrive the medium name with "TPC_" as a leading string
115   //
116   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
117   //
118   tpc->DefineSection(0,-291.,77.,278.);
119   tpc->DefineSection(1,-270,77.,278.);
120   //
121   tpc->DefineSection(2,-270.,77.,278.);
122   tpc->DefineSection(3,-259.6,70.,278.);
123   //
124   tpc->DefineSection(4,-259.6,68.1,278.);
125   tpc->DefineSection(5,-253.6,68.1,278.);
126   //
127   tpc->DefineSection(6,-253.6,68.,278.);
128   tpc->DefineSection(7,-74.0,60.8,278.);
129   //
130   tpc->DefineSection(8,-74.0,60.1,278.);
131   tpc->DefineSection(9,-73.3,60.1,278.);
132   //
133   tpc->DefineSection(10,-73.3,56.9,278.); 
134   tpc->DefineSection(11,73.3,56.9,278.);
135   //
136   tpc->DefineSection(12,73.3,60.1,278.);
137   tpc->DefineSection(13,74.0,60.1,278.);
138   //
139   tpc->DefineSection(14,74.0,60.8,278.);
140   tpc->DefineSection(15,253.6,65.5,278.);
141   //
142   tpc->DefineSection(16,253.6,65.6,278.);
143   tpc->DefineSection(17,259.6,65.6,278.);
144   //
145   tpc->DefineSection(18,259.6,70.0,278.);
146   tpc->DefineSection(19,291.,77.,278.);
147   //
148   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
149   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
150   //
151   // drift volume - sensitive volume, extended beyond the
152   // endcaps, because of the alignment
153   //
154   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
155   dvol->DefineSection(0,-260.,74.5,264.4);
156   dvol->DefineSection(1,-253.6,74.5,264.4);
157   //
158   dvol->DefineSection(2,-253.6,76.6774,258.);
159   dvol->DefineSection(3,253.6,76.6774,258.); 
160   //
161   dvol->DefineSection(4,253.6,74.5,264.4);
162   dvol->DefineSection(5,260.,74.5,264.4);
163   //
164   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
165   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
166   //
167   v1->AddNode(v9,1);
168   //
169   // outer insulator
170   //
171   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
172   //
173   tpco->DefineSection(0,-256.6,264.8,278.);
174   tpco->DefineSection(1,-253.6,264.8,278.);
175   //
176   tpco->DefineSection(2,-253.6,258.,278.);
177   tpco->DefineSection(3,250.6,258.,278.);
178   //
179   tpco->DefineSection(4,250.6,258.,275.5);
180   tpco->DefineSection(5,253.6,258.,275.5);
181   //
182   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
183   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
184   //
185   // outer containment vessel
186   //
187   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
188   //
189   tocv->DefineSection(0,-256.6,264.8,278.);
190   tocv->DefineSection(1,-253.6,264.8,278.);
191   //
192   tocv->DefineSection(2,-253.6,274.8124,278.);
193   tocv->DefineSection(3,247.6,274.8124,278.);  
194   //
195   tocv->DefineSection(4,247.6,270.4,278.);
196   tocv->DefineSection(5,250.6,270.4,278.);
197   //
198   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
199   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
200   //
201   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
202   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
203   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
204   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
205   //
206   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
207   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
208   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
209   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
210   //
211   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
212   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
213   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
214   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
215
216   //-------------------------------------------------------
217   //  Tpc Outer Field Cage
218   //  daughters - composite (sandwich)
219   //-------------------------------------------------------
220
221   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
222   //
223   tofc->DefineSection(0,-253.6,258.,269.6);
224   tofc->DefineSection(1,-250.6,258.,269.6);
225   //
226   tofc->DefineSection(2,-250.6,258.,260.0676); 
227   tofc->DefineSection(3,250.6,258.,260.0676);
228   //
229   tofc->DefineSection(4,250.6,258.,275.5);
230   tofc->DefineSection(5,253.6,258.,275.5);
231   //
232   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
233   //sandwich
234   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
235   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
236   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
237   //
238   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
239   //
240   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
241   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
242   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
243   //
244   // outer part - positioning
245   //
246   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
247   //
248   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
249   //
250   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
251   //
252   v2->AddNode(v3,1); v2->AddNode(v4,1); 
253   //
254   v1->AddNode(v2,1);
255   //-----------------------------------------------------------
256
257
258
259
260
261
262   //--------------------------------------------------------------------
263   // Tpc Inner INsulator (CO2) 
264   // the cones, the central drum and the inner f.c. sandwich with a piece
265   // of the flane will be placed in the TPC
266   //--------------------------------------------------------------------
267   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
268   //
269   tpci->DefineSection(0,-253.6,68.4,76.6774);
270   tpci->DefineSection(1,-74.0,61.2,76.6774);
271   //
272   tpci->DefineSection(2,74.0,61.2,76.6774);  
273   //
274   tpci->DefineSection(3,253.6,65.9,76.6774);
275   //
276   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
277   //
278   // now the inner field cage - only part of flanges (2 copies)
279   //
280   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
281   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
282   //
283  //---------------------------------------------------------
284   // Tpc Inner Containment vessel - Muon side
285   //---------------------------------------------------------
286   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
287   //
288   tcms->DefineSection(0,-259.1,68.1,74.2);
289   tcms->DefineSection(1,-253.6,68.1,74.2);
290   //
291   tcms->DefineSection(2,-253.6,68.1,68.4);
292   tcms->DefineSection(3,-74.0,60.9,61.2);
293   //
294   tcms->DefineSection(4,-74.0,60.1,61.2);
295   tcms->DefineSection(5,-73.3,60.1,61.2);
296   //
297   tcms->DefineSection(6,-73.3,56.9,61.2);
298   tcms->DefineSection(7,-73.0,56.9,61.2);
299   //
300   tcms->DefineSection(8,-73.0,56.9,58.8);
301   tcms->DefineSection(9,-71.3,56.9,58.8);
302   //
303   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
304   //-----------------------------------------------
305   // inner containment vessel - shaft side
306   //-----------------------------------------------
307   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
308   //
309   tcss->DefineSection(0,71.3,56.9,58.8);
310   tcss->DefineSection(1,73.0,56.9,58.8);
311   //
312   tcss->DefineSection(2,73.0,56.9,61.2);
313   tcss->DefineSection(3,73.3,56.9,61.2);
314   //  
315   tcss->DefineSection(4,73.3,60.1,61.2);
316   tcss->DefineSection(5,74.0,60.1,61.2);
317   //
318   tcss->DefineSection(6,74.0,60.9,61.2);
319   tcss->DefineSection(7,253.6,65.6,65.9);
320   //
321   tcss->DefineSection(8,253.6,65.6,74.2);
322   tcss->DefineSection(9,258.1,65.6,74.2);
323   //
324   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
325   //-----------------------------------------------
326   //  Inner field cage
327   //  define 4 parts and make an assembly
328   //-----------------------------------------------
329   // part1 - Al - 2 copies
330   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
331   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
332   // sandwich - outermost parts - 2 copies
333   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
334   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
335   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
336   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
337   //
338   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
339   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
340   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
341   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
342   //
343   // middle parts - 2 copies
344   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
345   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
346   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
347   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
348   //
349   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
350   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
351   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
352   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
353   // central part - 1 copy
354   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns 
355   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
356   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
357   //
358   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
359   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
360   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
361   //
362   // inner part - positioning
363   //
364   // creating a sandwich
365   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
366   //
367   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
368   //
369   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
370   //
371   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
372   //
373   tv100->AddNode(tv10,1);
374   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
375   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
376   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
377   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
378   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
379   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
380   //
381   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
382   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
383   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
384   v9->AddNode(tv100,1);
385   //
386   // central drum 
387   //
388   // flange + sandwich
389   //
390   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
391   cfl->DefineSection(0,-71.1,59.7,61.2);
392   cfl->DefineSection(1,-68.6,59.7,61.2);
393   //
394   cfl->DefineSection(2,-68.6,60.6324,61.2);
395   cfl->DefineSection(3,68.6,60.6324,61.2); 
396   //
397   cfl->DefineSection(4,68.6,59.7,61.2);
398   cfl->DefineSection(5,71.1,59.7,61.2);  
399   //
400   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
401   // sandwich
402   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
403   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
404   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);  
405   //
406   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
407   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
408   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
409   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
410   //
411   // seals for central drum 2 copies
412   //
413   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
414   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
415   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
416   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
417   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
418   //
419   // seal collars 
420   TGeoPcon *se = new TGeoPcon(0.,360.,6);
421   se->DefineSection(0,-72.8,59.7,61.2);
422   se->DefineSection(1,-72.3,59.7,61.2);
423   //
424   se->DefineSection(2,-72.3,58.85,61.2);
425   se->DefineSection(3,-71.6,58.85,61.2); 
426   //
427   se->DefineSection(4,-71.6,59.7,61.2);
428   se->DefineSection(5,-71.3,59.7,61.2);  
429   //
430   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
431   //
432   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
433   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
434   //
435   // define reflection matrix 
436   //
437   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
438   //
439   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
440   //
441   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
442   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
443   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
444   //
445   // central membrane - 2 rings and a mylar membrane - assembly
446   //
447   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
448   TGeoTube *oh = new TGeoTube(250.,256.,.5);
449   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
450   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
451   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
452   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
453   //
454   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
455   cm->AddNode(ihv,1);
456   cm->AddNode(ohv,1);
457   cm->AddNode(memv,1);
458   v9->AddNode(cm,1);
459   //
460   // end caps - they are make as an assembly of single segments
461   // containing both readout chambers
462   //
463   Double_t openingAngle = 10.*TMath::DegToRad();
464   Double_t thick=1.5; // rib
465   Double_t shift = thick/TMath::Sin(openingAngle);
466   //
467   Double_t lowEdge = 86.3; // hole in the wheel
468   Double_t upEdge = 240.4; // hole in the wheel
469   //
470   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
471   //
472   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
473   //
474   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
475   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
476   //
477   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
478   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
479   //
480   Double_t ys = shift*TMath::Sin(openingAngle); 
481   Double_t xs = shift*TMath::Cos(openingAngle);
482   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
483   tr->RegisterYourself();
484   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
485   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
486   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
487   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
488   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
489   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
490   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
491   //
492   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
493   //
494   // readout chambers
495   //
496   // IROC first
497   //
498    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
499    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
500   // empty space
501    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
502    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
503    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
504    //bars
505    Double_t tga = (19.8328-12.3742)/39.3;
506    Double_t xmin,xmax;
507    xmin = 9.55*tga+12.3742;
508    xmax = 9.95*tga+12.3742;
509    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
510    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
511    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
512    xmin=19.4*tga+12.3742;
513    xmax=19.9*tga+12.3742;
514    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
515    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
516    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
517    xmin=29.35*tga+12.3742;
518    xmax=29.75*tga+12.3742;
519    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
520    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
521    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
522    //
523    // holes for connectors
524    //
525    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
526    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
527    TString fileName(gSystem->Getenv("ALICE_ROOT"));
528    fileName += "/TPC/conn_iroc.dat";
529    ifstream in;
530    in.open(fileName.Data(), ios_base::in); // asci file
531    for(Int_t i =0;i<86;i++){
532       Double_t y = 3.99;
533       Double_t x,z,ang;
534       in>>x>>z>>ang;
535       z-=26.5;
536       TGeoRotation *rrr = new TGeoRotation();
537       rrr->RotateY(ang);
538       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
539       ibdv->AddNode(connv,i+1,trans);
540    }
541    in.close();
542    // "cap"
543    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
544    // "hole"
545    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
546    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
547    tr1->RegisterYourself();
548    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
549    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
550    //
551    // pad plane and wire fixations
552    //
553    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
554    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
555    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
556    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
557    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
558    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
559    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
560    //
561    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
562    //
563    iroc->AddNode(ibdv,1);
564    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
565    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
566    tga =(23.3521-14.5974)/49.65; 
567    Double_t xx = 24.825*tga+14.5974-0.6;
568    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
569    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
570    //
571    // OROC
572    //
573    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
574    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
575    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
576    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
577    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
578    //horizontal bars
579    tga=(38.5084-20.2938)/99.3;
580    xmin=tga*10.2+20.2938;
581    xmax=tga*10.6+20.2938;
582    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
583    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
584    //
585    xmin=22.55*tga+20.2938;
586    xmax=24.15*tga+20.2938;
587    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
588    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
589    //
590    xmin=36.1*tga+20.2938;
591    xmax=36.5*tga+20.2938;
592    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
593    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
594    //
595    xmin=49.0*tga+20.2938;
596    xmax=50.6*tga+20.2938;   
597    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
598    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
599    //
600    xmin=63.6*tga+20.2938;
601    xmax=64.0*tga+20.2938;
602    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
603    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
604    //
605    xmin=75.5*tga+20.2938;
606    xmax=77.15*tga+20.2938;
607    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
608    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
609    //
610    xmin=88.7*tga+20.2938;
611    xmax=89.1*tga+20.2938;
612    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
613    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
614    //
615    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
616    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
617    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
618    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
619    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
620    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
621    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
622    // vertical bars
623    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
624    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
625    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
626    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
627    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
628    //
629    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
630    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
631    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
632    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
633    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
634    //
635    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
636    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
637    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
638    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
639    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
640    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
641    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
642    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
643    //
644    // holes for connectors
645    //
646    fileName = gSystem->Getenv("ALICE_ROOT");
647    fileName += "/TPC/conn_oroc.dat";
648    in.open(fileName.Data(), ios_base::in); // asci file
649    for(Int_t i =0;i<78;i++){
650       Double_t y =3.89;
651       Double_t x,z,ang;
652       Double_t x1,z1,x2,z2;
653       in>>x>>z>>ang;        
654       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
655       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
656       //
657       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
658       //
659       TGeoRotation *rr = new TGeoRotation();
660       rr->RotateY(ang); 
661       z1-=54.95;
662       z2-=54.95;
663       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
664       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
665       obdv->AddNode(connv,i+1,trans1);
666       obdv->AddNode(connv,i+79,trans2);
667    }
668    in.close();
669    // cap
670    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
671    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
672    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
673    tr5->RegisterYourself();
674    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
675    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
676    //
677    // pad plane and wire fixations
678    //
679    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
680    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
681    //
682    tga=(43.5239-23.3874)/114.2;
683    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
684    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
685    xx = 57.1*tga+23.3874-0.7;
686    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
687    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
688    //
689    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
690    //
691    oroc->AddNode(obdv,1);
692    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
693    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
694    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
695    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
696    // 
697    // now iroc and oroc are placed into a sector...
698    //
699    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
700    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
701    TGeoRotation rot1("rot1",90.,90.,0.);
702    TGeoRotation rot2("rot2");
703    rot2.RotateY(10.);
704    TGeoRotation *rot = new TGeoRotation("rot");
705    *rot=rot1*rot2;
706    //
707    Double_t x0,y0;
708    x0=110.2*TMath::Cos(openingAngle);
709    y0=110.2*TMath::Sin(openingAngle);
710    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side 
711    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
712    x0=188.45*TMath::Cos(openingAngle);
713    y0=188.45*TMath::Sin(openingAngle);
714    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
715    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
716    //
717    // A-side
718    //
719    secta->AddNode(ch,1);
720    secta->AddNode(iroc,1,combi1a);
721    secta->AddNode(oroc,1,combi2a);
722    //
723    // C-side
724    //
725    sectc->AddNode(ch,1);
726    sectc->AddNode(iroc,1,combi1c);
727    sectc->AddNode(oroc,1,combi2c);
728    //
729    // now I try to make  wheels...
730    //
731    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
732    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
733    //
734    for(Int_t i =0;i<18;i++){
735      Double_t phi = (20.*i);
736      TGeoRotation *r = new TGeoRotation();
737      r->RotateZ(phi);
738      wheela->AddNode(secta,i+1,r);
739      wheelc->AddNode(sectc,i+1,r);
740     
741    }
742    // wheels in the drift volume!
743    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
744    v9->AddNode(wheela,1,combi3);
745    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
746    
747    //_____________________________________________________________
748    // service support wheel
749    //_____________________________________________________________
750   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
751   sw->DefineSection(0,-4.,80.5,251.75);
752   sw->DefineSection(1,4.,80.5,251.75); 
753   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
754   //
755   thick=1.;
756   shift = thick/TMath::Sin(openingAngle);
757   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
758   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
759   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
760   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
761   //
762   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
763   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
764   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
765   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
766   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
767   //
768   shv->AddNode(elv,1);
769   //
770   ys = shift*TMath::Sin(openingAngle);
771   xs = shift*TMath::Cos(openingAngle);
772   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
773   // cover
774   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
775   co->DefineSection(0,-0.5,77.,255.25);
776   co->DefineSection(1,0.5,77.,255.25);
777   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
778   // hole in a cover
779   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
780   shift=4./TMath::Sin(openingAngle);
781   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
782   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
783   //
784   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
785   //
786   ys = shift*TMath::Sin(openingAngle);
787   xs = shift*TMath::Cos(openingAngle);  
788   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
789   //
790   // Sector as an Assembly
791   //
792   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
793   swhs->AddNode(swv,1);
794   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
795   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
796   //
797   // SSW as an Assembly of sectors
798   //
799  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
800    for(Int_t i =0;i<18;i++){
801      Double_t phi = (20.*i);
802      TGeoRotation *r = new TGeoRotation();
803      r->RotateZ(phi);
804      swheel->AddNode(swhs,i+1,r);   
805    }
806    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
807    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
808    //
809   //----------------------------------------------------------
810   // TPc Support Rods - MAKROLON
811   //----------------------------------------------------------
812   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
813   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
814   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
815   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
816   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
817   // upper and lower rods differ in length!
818   Double_t *upar;
819   upar=NULL;
820   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
821   upar=new Double_t [3];
822   upar[0]=1.8;
823   upar[1]=2.2;
824   
825   //
826   //HV rods - makrolon + 0.58cm (diameter) Cu
827   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
828   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
829   //
830   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
831   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
832   hvrv->AddNode(hvcv,1);
833   //
834   // resistor rods
835   //
836   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
837   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
838   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
839   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
840   //
841   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
842   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
843   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
844   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
845   //
846   // ceramic rod with water
847   //
848   criv->AddNode(cwiv,1); 
849   crov->AddNode(cwov,1);
850   //
851   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
852   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
853   //
854   // peek rod
855   //
856   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
857   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
858   //
859   // resistor rods assembly
860   //
861    TGeoRotation rotr("rotr");
862    rotr.RotateZ(-21.);
863   //
864   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
865   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
866   //
867   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
868   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
869   //
870   rrov->AddNode(crov,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
871   rrov->AddNode(crov,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
872   rrov->AddNode(prov,1);
873   //
874   rriv->AddNode(criv,1,new TGeoCombiTrans(0.5,0.866,0.,&rotr));
875   rriv->AddNode(criv,2,new TGeoCombiTrans(0.5,-0.866,0.,&rotr));
876   rriv->AddNode(priv,1); 
877   for(Int_t i=0;i<18;i++){
878     Double_t angle,x,y;
879     Double_t z,r; 
880     angle=TMath::DegToRad()*20.*(Double_t)i;
881     r=81.5;
882     x=r * TMath::Cos(angle);
883     y=r * TMath::Sin(angle);
884     upar[2]=126.64; //lower
885     z= 126.96;
886     //
887     if(i==3){
888       v9->AddNode(rriv,1,new TGeoTranslation(x,y,z)); //A
889       v9->AddNode(rriv,2,new TGeoTranslation(x,y,-z)); //C      
890     } 
891     else { 
892       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
893       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
894     }
895    
896
897     //
898     r=254.25;
899     x=r * TMath::Cos(angle);
900     y=r * TMath::Sin(angle);
901     upar[2]=126.54; //upper
902     z=127.06;
903     if(i==15){
904       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
905       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
906     }
907     else if(i==11){
908       v9->AddNode(rrov,1,new TGeoTranslation(x,y,z)); //A
909       v9->AddNode(rrov,2,new TGeoTranslation(x,y,-z)); //C
910     }
911     else{
912     //
913       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
914       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
915     }
916   }
917
918   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
919   alice->AddNode(v1,1);
920   
921
922  
923 } // end of function
924  
925 //_____________________________________________________________________________
926 void AliTPCv3::DrawDetector()
927 {
928   //
929   // Draw a shaded view of the Time Projection Chamber version 3
930   //
931
932
933   // Set everything unseen
934   gMC->Gsatt("*", "seen", -1);
935   // 
936   // Set ALIC mother transparent
937   gMC->Gsatt("ALIC","SEEN",0);
938   //
939   // Set the volumes visible
940   //
941
942   gMC->Gsatt("TPC ","SEEN",0);
943   gMC->Gsatt("TOIN","SEEN",1);
944   gMC->Gsatt("TOIN","COLO",7);
945   gMC->Gsatt("TOCV","SEEN",1);
946   gMC->Gsatt("TOCV","COLO",4);
947   gMC->Gsatt("TSA1","SEEN",0);
948   gMC->Gsatt("TSA2","SEEN",0);
949   gMC->Gsatt("TSA3","SEEN",0);
950   gMC->Gsatt("TSA4","SEEN",0);  
951   gMC->Gsatt("TSA5","SEEN",0);
952   gMC->Gsatt("TOFC","SEEN",1);
953   gMC->Gsatt("TOFC","COLO",4);
954   gMC->Gsatt("TSA6","SEEN",0);
955   gMC->Gsatt("TSA7","SEEN",0);
956   gMC->Gsatt("TSA8","SEEN",0);    
957   gMC->Gsatt("TIIN","SEEN",1);
958   gMC->Gsatt("TIIN","COLO",7);
959   gMC->Gsatt("TII1","SEEN",0);
960   gMC->Gsatt("TIFC","SEEN",1);
961   gMC->Gsatt("TIFC","COLO",4);
962   gMC->Gsatt("TSA9","SEEN",0); 
963   gMC->Gsatt("TS10","SEEN",0);
964   gMC->Gsatt("TS11","SEEN",0);
965   gMC->Gsatt("TS12","SEEN",0);
966   gMC->Gsatt("TS13","SEEN",0);
967   gMC->Gsatt("TS14","SEEN",0);
968   gMC->Gsatt("TICC","SEEN",0);
969   gMC->Gsatt("TICM","SEEN",0);
970   gMC->Gsatt("TS15","SEEN",0);
971   gMC->Gsatt("TS16","SEEN",0);
972   gMC->Gsatt("TS17","SEEN",0);
973   gMC->Gsatt("TS18","SEEN",0);  
974   gMC->Gsatt("TS19","SEEN",0); 
975   gMC->Gsatt("TPJ1","SEEN",0);
976   gMC->Gsatt("TPJ2","SEEN",0);
977   gMC->Gsatt("TICS","SEEN",0);
978   gMC->Gsatt("TDGS","SEEN",0); 
979   gMC->Gsatt("TIRC","SEEN",0);
980   gMC->Gsatt("TIC1","SEEN",1);
981   gMC->Gsatt("TIPP","SEEN",0);
982   gMC->Gsatt("TIC3","SEEN",0);
983   gMC->Gsatt("TRCE","SEEN",0);
984   gMC->Gsatt("TPSC","SEEN",0);
985   gMC->Gsatt("TPCC","SEEN",0); 
986   gMC->Gsatt("TORC","SEEN",0);
987   gMC->Gsatt("TOPP","SEEN",0);
988   gMC->Gsatt("TOC3","SEEN",0);
989   gMC->Gsatt("TOC1","SEEN",1);
990   gMC->Gsatt("TSSW","SEEN",1);
991   gMC->Gsatt("TSWC","SEEN",1);
992   gMC->Gsatt("TSSW","COLO",3);
993   gMC->Gsatt("TSWC","COLO",3);
994   gMC->Gsatt("TSCE","COLO",6);
995   gMC->Gsatt("TSCE","SEEN",1);
996   gMC->Gsatt("TWES","SEEN",0);
997   gMC->Gsatt("TSWB","SEEN",0);
998   gMC->Gsatt("TPEL","SEEN",0);
999   gMC->Gsatt("TPMW","SEEN",1);
1000   gMC->Gsatt("TESR","SEEN",1);
1001   gMC->Gsatt("TPMW","COLO",12);
1002   gMC->Gsatt("TIC1","COLO",5);
1003   gMC->Gsatt("TOC1","COLO",5);
1004   gMC->Gsatt("TESB","SEEN",0);
1005   gMC->Gsatt("THVM","SEEN",1);
1006   gMC->Gsatt("THVM","COLO",11);
1007   gMC->Gsatt("THVH","SEEN",0);
1008   gMC->Gsatt("TPSR","SEEN",0); 
1009   gMC->Gsatt("THVL","SEEN",0);
1010   gMC->Gsatt("THVC","SEEN",0);  
1011   gMC->Gsatt("THVE","SEEN",0);
1012   gMC->Gsatt("THVR","SEEN",0);
1013
1014   //
1015   gMC->Gdopt("hide", "on");
1016   gMC->Gdopt("shad", "on");
1017   gMC->Gsatt("*", "fill", 7);
1018   gMC->SetClipBox(".");
1019   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1020   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1021   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1022   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1023   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1024   gMC->DefaultRange();
1025   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1026   gMC->Gdhead(1111, "Time Projection Chamber");
1027   gMC->Gdman(18, 4, "MAN");
1028   gMC->Gdopt("hide","off");
1029 }
1030
1031 //_____________________________________________________________________________
1032 void AliTPCv3::CreateMaterials()
1033 {
1034   //
1035   // Define materials for version 2 of the Time Projection Chamber
1036   //
1037
1038
1039   //
1040   AliTPC::CreateMaterials();
1041 }
1042
1043 //_____________________________________________________________________________
1044 void AliTPCv3::Init()
1045 {
1046   //
1047   // Initialises version 3 of the TPC after that it has been built
1048   //
1049   Int_t *idtmed = fIdtmed->GetArray();
1050
1051   AliTPC::Init();
1052
1053    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
1054
1055   gMC->SetMaxNStep(-30000); // max. number of steps increased
1056
1057   gMC->Gstpar(idtmed[2],"LOSS",5);
1058
1059   printf("%s: *** TPC version 3 initialized***\n",ClassName());
1060
1061   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1062
1063   // printf("*** TPC version 3 initialized ***\n");
1064   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1065
1066   //
1067   
1068 }
1069
1070 //_____________________________________________________________________________
1071 void AliTPCv3::StepManager()
1072 {
1073   //
1074   // Called for every step in the Time Projection Chamber
1075   //
1076
1077   //
1078   // parameters used for the energy loss calculations
1079   //
1080   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1081   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1082   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1083  
1084  
1085   const Float_t kbig = 1.e10;
1086
1087   Int_t id,copy;
1088   TLorentzVector pos;
1089   Float_t hits[5];
1090   Int_t vol[2];  
1091   
1092   vol[1]=0;
1093   vol[0]=0;
1094
1095   //
1096
1097   gMC->SetMaxStep(kbig);
1098   
1099   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1100   
1101   Float_t charge = gMC->TrackCharge();
1102   
1103   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1104   
1105   
1106   id=gMC->CurrentVolID(copy);
1107
1108   
1109   if (id != fIdSens) return;
1110   
1111   //
1112   //  charged particle is in the sensitive volume
1113   //
1114   
1115   if(gMC->TrackStep() > 0) {
1116
1117     
1118     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1119     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1120     
1121     gMC->TrackPosition(pos);
1122     hits[0]=pos[0];
1123     hits[1]=pos[1];
1124     hits[2]=pos[2];
1125
1126     // Get also the track time for pileup simulation
1127     hits[4]=gMC->TrackTime();
1128
1129     //
1130     // check the selected side of the TPC
1131     //
1132  
1133     if(fSide && fSide*hits[2]<=0.) return;
1134
1135     hits[3]=(Float_t)nel;
1136     
1137     // Add this hit
1138    
1139     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1140     
1141   } 
1142   
1143   // Stemax calculation for the next step
1144   
1145   Float_t pp;
1146   TLorentzVector mom;
1147   gMC->TrackMomentum(mom);
1148   Float_t ptot=mom.Rho();
1149   Float_t betaGamma = ptot/gMC->TrackMass();
1150   
1151   Int_t pid=gMC->TrackPid();
1152   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1153     { 
1154       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1155     }
1156   else
1157     {
1158       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); 
1159       pp=kprim*BetheBloch(betaGamma);    
1160       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1161     }
1162   
1163   Double_t rnd = gMC->GetRandom()->Rndm();
1164   
1165   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1166   
1167 }
1168
1169 //_____________________________________________________________________________
1170 Float_t AliTPCv3::BetheBloch(Float_t bg)
1171 {
1172   //
1173   // Bethe-Bloch energy loss formula
1174   //
1175   const Double_t kp1=0.76176e-1;
1176   const Double_t kp2=10.632;
1177   const Double_t kp3=0.13279e-4;
1178   const Double_t kp4=1.8631;
1179   const Double_t kp5=1.9479;
1180
1181   Double_t dbg = (Double_t) bg;
1182
1183   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1184
1185   Double_t aa = TMath::Power(beta,kp4);
1186   Double_t bb = TMath::Power(1./dbg,kp5);
1187
1188   bb=TMath::Log(kp3+bb);
1189   
1190   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1191 }