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