GetClusterFast function implemented (No getter before) (Marian)
[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.                                    *
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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(){
63
64   fHitType = 1;
65
66
67
68 //_____________________________________________________________________________
69 AliTPCv3::AliTPCv3(const char *name, const char *title) :
70   AliTPC(name, title) 
71 {
72   //
73   // Standard constructor for Time Projection Chamber version 3
74   //
75
76   SetBufferSize(128000);
77   fIdSens=0;
78
79
80   if (fTPCParam)
81      fTPCParam->Write(fTPCParam->GetTitle());
82
83   fHitType =1;
84 }
85  
86 //_____________________________________________________________________________
87 void AliTPCv3::CreateGeometry()
88 {
89   //
90   // Creation of the TPC coarse geometry (version 3)
91   // The whole drift volume is sensitive
92   // Origin Marek Kowalski Cracow
93   //
94   //Begin_Html
95   /*
96     <img src="picts/AliTPCgif">
97   */
98   //End_Html
99   //Begin_Html
100   /*
101     <img src="picts/AliTPCv3Tree.gif">
102   */
103   //End_Html
104    //----------------------------------------------------------
105   // This geometry is written using TGeo class
106   // Firstly the shapes are defined, and only then the volumes
107   // What is recognized by the MC are volumes
108   //----------------------------------------------------------
109   //
110   //  tpc - this will be the mother volume
111   //
112
113   //
114   // here I define a volume TPC
115   // retrive the medium name with "TPC_" as a leading string
116   //
117   TGeoPcon *tpc = new TGeoPcon(0.,360.,18); //18 sections
118   tpc->DefineSection(0,-290.,77.,278.);
119   tpc->DefineSection(1,-259.6,70.,278.);
120   //
121   tpc->DefineSection(2,-259.6,68.1,278.);
122   tpc->DefineSection(3,-253.6,68.1,278.);
123   //
124   tpc->DefineSection(4,-253.6,68.,278.);
125   tpc->DefineSection(5,-74.0,60.8,278.);
126   //
127   tpc->DefineSection(6,-74.0,60.1,278.);
128   tpc->DefineSection(7,-73.3,60.1,278.);
129   //
130   tpc->DefineSection(8,-73.3,56.9,278.); 
131   tpc->DefineSection(9,73.3,56.9,278.);
132   //
133   tpc->DefineSection(10,73.3,60.1,278.);
134   tpc->DefineSection(11,74.0,60.1,278.);
135   //
136   tpc->DefineSection(12,74.0,60.8,278.);
137   tpc->DefineSection(13,253.6,65.5,278.);
138   //
139   tpc->DefineSection(14,253.6,65.6,278.);
140   tpc->DefineSection(15,259.6,65.6,278.);
141   //
142   tpc->DefineSection(16,259.6,70.0,278.);
143   tpc->DefineSection(17,290.,77.,278.);
144   //
145   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
146   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
147   //
148   // drift volume - sensitive volume, extended beyond the
149   // endcaps, because of the alignment
150   //
151   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
152   dvol->DefineSection(0,-260.,74.5,264.4);
153   dvol->DefineSection(1,-253.6,74.5,264.4);
154   //
155   dvol->DefineSection(2,-253.6,76.6774,258.);
156   dvol->DefineSection(3,253.6,76.6774,258.); 
157   //
158   dvol->DefineSection(4,253.6,74.5,264.4);
159   dvol->DefineSection(5,260.,74.5,264.4);
160   //
161   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
162   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
163   //
164   v1->AddNode(v9,1);
165   //
166   // outer insulator
167   //
168   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
169   //
170   tpco->DefineSection(0,-256.6,264.8,278.);
171   tpco->DefineSection(1,-253.6,264.8,278.);
172   //
173   tpco->DefineSection(2,-253.6,258.,278.);
174   tpco->DefineSection(3,250.6,258.,278.);
175   //
176   tpco->DefineSection(4,250.6,258.,275.5);
177   tpco->DefineSection(5,253.6,258.,275.5);
178   //
179   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
180   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
181   //
182   // outer containment vessel
183   //
184   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
185   //
186   tocv->DefineSection(0,-256.6,264.8,278.);
187   tocv->DefineSection(1,-253.6,264.8,278.);
188   //
189   tocv->DefineSection(2,-253.6,274.8124,278.);
190   tocv->DefineSection(3,247.6,274.8124,278.);  
191   //
192   tocv->DefineSection(4,247.6,270.4,278.);
193   tocv->DefineSection(5,250.6,270.4,278.);
194   //
195   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
196   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
197   //
198   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
199   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
200   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
201   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
202   //
203   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
204   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
205   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
206   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
207   //
208   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
209   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
210   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
211   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
212
213   //-------------------------------------------------------
214   //  Tpc Outer Field Cage
215   //  daughters - composite (sandwich)
216   //-------------------------------------------------------
217
218   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
219   //
220   tofc->DefineSection(0,-253.6,258.,269.6);
221   tofc->DefineSection(1,-250.6,258.,269.6);
222   //
223   tofc->DefineSection(2,-250.6,258.,260.0676); 
224   tofc->DefineSection(3,250.6,258.,260.0676);
225   //
226   tofc->DefineSection(4,250.6,258.,275.5);
227   tofc->DefineSection(5,253.6,258.,275.5);
228   //
229   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
230   //sandwich
231   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
232   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
233   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
234   //
235   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
236   //
237   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
238   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
239   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
240   //
241   // outer part - positioning
242   //
243   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
244   //
245   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
246   //
247   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
248   //
249   v2->AddNode(v3,1); v2->AddNode(v4,1); 
250   //
251   v1->AddNode(v2,1);
252   //-----------------------------------------------------------
253
254
255
256
257
258
259   //--------------------------------------------------------------------
260   // Tpc Inner INsulator (CO2) 
261   // the cones, the central drum and the inner f.c. sandwich with a piece
262   // of the flane will be placed in the TPC
263   //--------------------------------------------------------------------
264   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
265   //
266   tpci->DefineSection(0,-253.6,68.4,76.6774);
267   tpci->DefineSection(1,-74.0,61.2,76.6774);
268   //
269   tpci->DefineSection(2,74.0,61.2,76.6774);  
270   //
271   tpci->DefineSection(3,253.6,65.9,76.6774);
272   //
273   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
274   //
275   // now the inner field cage - only part of flanges (2 copies)
276   //
277   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
278   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
279   //
280  //---------------------------------------------------------
281   // Tpc Inner Containment vessel - Muon side
282   //---------------------------------------------------------
283   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
284   //
285   tcms->DefineSection(0,-259.1,68.1,74.2);
286   tcms->DefineSection(1,-253.6,68.1,74.2);
287   //
288   tcms->DefineSection(2,-253.6,68.1,68.4);
289   tcms->DefineSection(3,-74.0,60.9,61.2);
290   //
291   tcms->DefineSection(4,-74.0,60.1,61.2);
292   tcms->DefineSection(5,-73.3,60.1,61.2);
293   //
294   tcms->DefineSection(6,-73.3,56.9,61.2);
295   tcms->DefineSection(7,-73.0,56.9,61.2);
296   //
297   tcms->DefineSection(8,-73.0,56.9,58.8);
298   tcms->DefineSection(9,-71.3,56.9,58.8);
299   //
300   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
301   //-----------------------------------------------
302   // inner containment vessel - shaft side
303   //-----------------------------------------------
304   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
305   //
306   tcss->DefineSection(0,71.3,56.9,58.8);
307   tcss->DefineSection(1,73.0,56.9,58.8);
308   //
309   tcss->DefineSection(2,73.0,56.9,61.2);
310   tcss->DefineSection(3,73.3,56.9,61.2);
311   //  
312   tcss->DefineSection(4,73.3,60.1,61.2);
313   tcss->DefineSection(5,74.0,60.1,61.2);
314   //
315   tcss->DefineSection(6,74.0,60.9,61.2);
316   tcss->DefineSection(7,253.6,65.6,65.9);
317   //
318   tcss->DefineSection(8,253.6,65.6,74.2);
319   tcss->DefineSection(9,258.1,65.6,74.2);
320   //
321   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
322   //-----------------------------------------------
323   //  Inner field cage
324   //  define 4 parts and make an assembly
325   //-----------------------------------------------
326   // part1 - Al - 2 copies
327   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
328   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
329   // sandwich - outermost parts - 2 copies
330   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
331   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
332   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
333   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
334   //
335   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
336   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
337   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
338   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
339   //
340   // middle parts - 2 copies
341   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
342   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
343   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
344   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
345   //
346   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
347   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
348   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
349   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
350   // central part - 1 copy
351   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns 
352   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
353   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
354   //
355   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
356   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
357   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
358   //
359   // inner part - positioning
360   //
361   // creating a sandwich
362   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
363   //
364   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
365   //
366   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
367   //
368   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
369   //
370   tv100->AddNode(tv10,1);
371   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
372   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
373   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
374   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
375   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
376   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
377   //
378   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
379   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
380   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
381   v9->AddNode(tv100,1);
382   //
383   // central drum 
384   //
385   // flange + sandwich
386   //
387   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
388   cfl->DefineSection(0,-71.1,59.7,61.2);
389   cfl->DefineSection(1,-68.6,59.7,61.2);
390   //
391   cfl->DefineSection(2,-68.6,60.6324,61.2);
392   cfl->DefineSection(3,68.6,60.6324,61.2); 
393   //
394   cfl->DefineSection(4,68.6,59.7,61.2);
395   cfl->DefineSection(5,71.1,59.7,61.2);  
396   //
397   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
398   // sandwich
399   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
400   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
401   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);  
402   //
403   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
404   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
405   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
406   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
407   //
408   // seals for central drum 2 copies
409   //
410   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
411   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
412   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
413   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.));
414   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.));
415   //
416   // seal collars 
417   TGeoPcon *se = new TGeoPcon(0.,360.,6);
418   se->DefineSection(0,-72.8,59.7,61.2);
419   se->DefineSection(1,-72.3,59.7,61.2);
420   //
421   se->DefineSection(2,-72.3,58.85,61.2);
422   se->DefineSection(3,-71.6,58.85,61.2); 
423   //
424   se->DefineSection(4,-71.6,59.7,61.2);
425   se->DefineSection(5,-71.3,59.7,61.2);  
426   //
427   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
428   //
429   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
430   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
431   //
432   // define reflection matrix 
433   //
434   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
435   //
436   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
437   //
438   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-70.1));
439   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,70.1));
440   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
441   //
442   // central membrane - 2 rings and a mylar membrane - assembly
443   //
444   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
445   TGeoTube *oh = new TGeoTube(250.,256.,.5);
446   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
447   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
448   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
449   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
450   //
451   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
452   cm->AddNode(ihv,1);
453   cm->AddNode(ohv,1);
454   cm->AddNode(memv,1);
455   v9->AddNode(cm,1);
456   //
457   // end caps - they are make as an assembly of single segments
458   // containing both readout chambers
459   //
460   Double_t OpeningAngle = 10.*TMath::DegToRad();
461   Double_t thick=1.5; // rib
462   Double_t shift = thick/TMath::Sin(OpeningAngle);
463   //
464   Double_t LowEdge = 86.3; // hole in the wheel
465   Double_t UpEdge = 240.4; // hole in the wheel
466   //
467   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
468   //
469   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
470   //
471   hole->DefineSection(0,-3.5,LowEdge-shift,UpEdge-shift);
472   hole->DefineSection(1,-1.5,LowEdge-shift,UpEdge-shift);
473   //
474   hole->DefineSection(2,-1.5,LowEdge-shift,UpEdge+3.-shift);
475   hole->DefineSection(3,3.5,LowEdge-shift,UpEdge+3.-shift);
476   //
477   Double_t ys = shift*TMath::Sin(OpeningAngle); 
478   Double_t xs = shift*TMath::Cos(OpeningAngle);
479   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
480   tr->RegisterYourself();
481   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
482   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
483   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
484   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
485   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
486   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
487   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
488   //
489   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
490   //
491   // readout chambers
492   //
493   // IROC first
494   //
495    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
496    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
497   // empty space
498    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
499    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
500    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
501    //bars
502    Double_t tga = (19.8328-12.3742)/39.3;
503    Double_t xmin,xmax;
504    xmin = 9.55*tga+12.3742;
505    xmax = 9.95*tga+12.3742;
506    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
507    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
508    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
509    xmin=19.4*tga+12.3742;
510    xmax=19.9*tga+12.3742;
511    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
512    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
513    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
514    xmin=29.35*tga+12.3742;
515    xmax=29.75*tga+12.3742;
516    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
517    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
518    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
519    //
520    // holes for connectors
521    //
522    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
523    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
524    TString fileName(gSystem->Getenv("ALICE_ROOT"));
525    fileName += "/TPC/conn_iroc.dat";
526    ifstream in;
527    in.open(fileName.Data(), ios_base::in); // asci file
528    for(Int_t i =0;i<86;i++){
529       Double_t y = 3.99;
530       Double_t x,z,ang;
531       in>>x>>z>>ang;
532       z-=26.5;
533       TGeoRotation *rrr = new TGeoRotation();
534       rrr->RotateY(ang);
535       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
536       ibdv->AddNode(connv,i+1,trans);
537    }
538    in.close();
539    // "cap"
540    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
541    // "hole"
542    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
543    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
544    tr1->RegisterYourself();
545    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
546    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
547    //
548    // pad plane and wire fixations
549    //
550    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
551    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
552    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
553    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
554    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
555    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
556    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
557    //
558    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
559    //
560    iroc->AddNode(ibdv,1);
561    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
562    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
563    tga =(23.3521-14.5974)/49.65; 
564    Double_t xx = 24.825*tga+14.5974-0.6;
565    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
566    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
567    //
568    // OROC
569    //
570    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
571    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
572    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
573    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
574    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
575    //horizontal bars
576    tga=(38.5084-20.2938)/99.3;
577    xmin=tga*10.2+20.2938;
578    xmax=tga*10.6+20.2938;
579    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
580    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
581    //
582    xmin=22.55*tga+20.2938;
583    xmax=24.15*tga+20.2938;
584    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
585    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
586    //
587    xmin=36.1*tga+20.2938;
588    xmax=36.5*tga+20.2938;
589    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
590    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
591    //
592    xmin=49.0*tga+20.2938;
593    xmax=50.6*tga+20.2938;   
594    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
595    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
596    //
597    xmin=63.6*tga+20.2938;
598    xmax=64.0*tga+20.2938;
599    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
600    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
601    //
602    xmin=75.5*tga+20.2938;
603    xmax=77.15*tga+20.2938;
604    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
605    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
606    //
607    xmin=88.7*tga+20.2938;
608    xmax=89.1*tga+20.2938;
609    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
610    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
611    //
612    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
613    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
614    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
615    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
616    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
617    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
618    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
619    // vertical bars
620    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
621    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
622    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
623    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
624    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
625    //
626    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
627    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
628    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
629    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
630    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
631    //
632    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
633    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
634    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
635    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
636    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
637    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
638    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
639    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
640    //
641    // holes for connectors
642    //
643    fileName = gSystem->Getenv("ALICE_ROOT");
644    fileName += "/TPC/conn_oroc.dat";
645    in.open(fileName.Data(), ios_base::in); // asci file
646    for(Int_t i =0;i<78;i++){
647       Double_t y =3.89;
648       Double_t x,z,ang;
649       Double_t x1,z1,x2,z2;
650       in>>x>>z>>ang;        
651       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
652       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
653       //
654       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
655       //
656       TGeoRotation *rr = new TGeoRotation();
657       rr->RotateY(ang); 
658       z1-=54.95;
659       z2-=54.95;
660       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
661       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
662       obdv->AddNode(connv,i+1,trans1);
663       obdv->AddNode(connv,i+79,trans2);
664    }
665    in.close();
666    // cap
667    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
668    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
669    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
670    tr5->RegisterYourself();
671    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
672    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
673    //
674    // pad plane and wire fixations
675    //
676    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
677    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
678    //
679    tga=(43.5239-23.3874)/114.2;
680    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
681    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
682    xx = 57.1*tga+23.3874-0.7;
683    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
684    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
685    //
686    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
687    //
688    oroc->AddNode(obdv,1);
689    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
690    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
691    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
692    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
693    // 
694    // now iroc and oroc are placed into a sector...
695    //
696    TGeoVolumeAssembly *sect = new TGeoVolumeAssembly("TPC_SECT");
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 *combi1 = new TGeoCombiTrans("combi1",x0,y0,1.09,rot);
707    x0=188.45*TMath::Cos(OpeningAngle);
708    y0=188.45*TMath::Sin(OpeningAngle);
709    TGeoCombiTrans *combi2 = new TGeoCombiTrans("combi2",x0,y0,0.99,rot);
710    //
711    sect->AddNode(ch,1);
712    sect->AddNode(iroc,1,combi1);
713    sect->AddNode(oroc,1,combi2);
714    //
715    // segment is ready...
716    // now I try to make a wheel...
717    //
718    TGeoVolumeAssembly *wheel = new TGeoVolumeAssembly("TPC_ENDCAP");
719    //
720    for(Int_t i =0;i<18;i++){
721      Double_t phi = (20.*i);
722      TGeoRotation *r = new TGeoRotation();
723      r->RotateZ(phi);
724      wheel->AddNode(sect,i+1,r);
725     
726    }
727    // wheels in the drift volume!
728    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
729    v9->AddNode(wheel,1,combi3);
730    v9->AddNode(wheel,2,new TGeoTranslation(0.,0.,-256.6));
731    
732    //_____________________________________________________________
733    // service support wheel
734    //_____________________________________________________________
735   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
736   sw->DefineSection(0,-4.,80.5,251.75);
737   sw->DefineSection(1,4.,80.5,251.75); 
738   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
739   //
740   thick=1.;
741   shift = thick/TMath::Sin(OpeningAngle);
742   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
743   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
744   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
745   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
746   //
747   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
748   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
749   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
750   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
751   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
752   //
753   shv->AddNode(elv,1);
754   //
755   ys = shift*TMath::Sin(OpeningAngle);
756   xs = shift*TMath::Cos(OpeningAngle);
757   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
758   // cover
759   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
760   co->DefineSection(0,-0.5,77.,255.25);
761   co->DefineSection(1,0.5,77.,255.25);
762   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
763   // hole in a cover
764   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
765   shift=4./TMath::Sin(OpeningAngle);
766   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
767   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
768   //
769   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
770   //
771   ys = shift*TMath::Sin(OpeningAngle);
772   xs = shift*TMath::Cos(OpeningAngle);  
773   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
774   //
775   // Sector as an Assembly
776   //
777   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
778   swhs->AddNode(swv,1);
779   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
780   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
781   //
782   // SSW as an Assembly of sectors
783   //
784  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
785    for(Int_t i =0;i<18;i++){
786      Double_t phi = (20.*i);
787      TGeoRotation *r = new TGeoRotation();
788      r->RotateZ(phi);
789      swheel->AddNode(swhs,i+1,r);   
790    }
791    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
792    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
793    //
794   //----------------------------------------------------------
795   // TPc Support Rods - MAKROLON
796   //----------------------------------------------------------
797   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
798   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
799   // upper and lower rods differ in length!
800   Double_t *upar;
801   upar=NULL;
802   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
803   upar=new Double_t [3];
804   upar[0]=1.8;
805   upar[1]=2.2;
806   
807   //
808   //HV rods - makrolon + 0.58cm (diameter) Cu
809   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
810   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
811   //
812   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
813   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
814   hvrv->AddNode(hvcv,1);
815   for(Int_t i=0;i<18;i++){
816     Double_t angle,x,y;
817     Double_t z,r; 
818     angle=TMath::DegToRad()*20.*(Double_t)i;
819     r=81.5;
820     x=r * TMath::Cos(angle);
821     y=r * TMath::Sin(angle);
822     upar[2]=126.64; //lower
823     z= 126.96;
824     if(i==15){
825       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));
826       v9->AddNode(hvrv,2,new TGeoTranslation(x,y,-z));
827     }
828     else{
829      gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
830      gGeoManager->Node("TPC_Rod",i+18,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
831     }
832     r=254.25;
833     x=r * TMath::Cos(angle);
834     y=r * TMath::Sin(angle);
835     upar[2]=126.54; //upper
836     z=127.06;
837     gGeoManager->Node("TPC_Rod",i+36,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
838     gGeoManager->Node("TPC_Rod",i+54,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
839   }
840
841   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
842   alice->AddNode(v1,1);
843   
844
845  
846 } // end of function
847  
848 //_____________________________________________________________________________
849 void AliTPCv3::DrawDetector()
850 {
851   //
852   // Draw a shaded view of the Time Projection Chamber version 3
853   //
854
855
856   // Set everything unseen
857   gMC->Gsatt("*", "seen", -1);
858   // 
859   // Set ALIC mother transparent
860   gMC->Gsatt("ALIC","SEEN",0);
861   //
862   // Set the volumes visible
863   //
864
865   gMC->Gsatt("TPC ","SEEN",0);
866   gMC->Gsatt("TOIN","SEEN",1);
867   gMC->Gsatt("TOIN","COLO",7);
868   gMC->Gsatt("TOCV","SEEN",1);
869   gMC->Gsatt("TOCV","COLO",4);
870   gMC->Gsatt("TSA1","SEEN",0);
871   gMC->Gsatt("TSA2","SEEN",0);
872   gMC->Gsatt("TSA3","SEEN",0);
873   gMC->Gsatt("TSA4","SEEN",0);  
874   gMC->Gsatt("TSA5","SEEN",0);
875   gMC->Gsatt("TOFC","SEEN",1);
876   gMC->Gsatt("TOFC","COLO",4);
877   gMC->Gsatt("TSA6","SEEN",0);
878   gMC->Gsatt("TSA7","SEEN",0);
879   gMC->Gsatt("TSA8","SEEN",0);    
880   gMC->Gsatt("TIIN","SEEN",1);
881   gMC->Gsatt("TIIN","COLO",7);
882   gMC->Gsatt("TII1","SEEN",0);
883   gMC->Gsatt("TIFC","SEEN",1);
884   gMC->Gsatt("TIFC","COLO",4);
885   gMC->Gsatt("TSA9","SEEN",0); 
886   gMC->Gsatt("TS10","SEEN",0);
887   gMC->Gsatt("TS11","SEEN",0);
888   gMC->Gsatt("TS12","SEEN",0);
889   gMC->Gsatt("TS13","SEEN",0);
890   gMC->Gsatt("TS14","SEEN",0);
891   gMC->Gsatt("TICC","SEEN",0);
892   gMC->Gsatt("TICM","SEEN",0);
893   gMC->Gsatt("TS15","SEEN",0);
894   gMC->Gsatt("TS16","SEEN",0);
895   gMC->Gsatt("TS17","SEEN",0);
896   gMC->Gsatt("TS18","SEEN",0);  
897   gMC->Gsatt("TS19","SEEN",0); 
898   gMC->Gsatt("TPJ1","SEEN",0);
899   gMC->Gsatt("TPJ2","SEEN",0);
900   gMC->Gsatt("TICS","SEEN",0);
901   gMC->Gsatt("TDGS","SEEN",0); 
902   gMC->Gsatt("TIRC","SEEN",0);
903   gMC->Gsatt("TIC1","SEEN",1);
904   gMC->Gsatt("TIPP","SEEN",0);
905   gMC->Gsatt("TIC3","SEEN",0);
906   gMC->Gsatt("TRCE","SEEN",0);
907   gMC->Gsatt("TPSC","SEEN",0);
908   gMC->Gsatt("TPCC","SEEN",0); 
909   gMC->Gsatt("TORC","SEEN",0);
910   gMC->Gsatt("TOPP","SEEN",0);
911   gMC->Gsatt("TOC3","SEEN",0);
912   gMC->Gsatt("TOC1","SEEN",1);
913   gMC->Gsatt("TSSW","SEEN",1);
914   gMC->Gsatt("TSWC","SEEN",1);
915   gMC->Gsatt("TSSW","COLO",3);
916   gMC->Gsatt("TSWC","COLO",3);
917   gMC->Gsatt("TSCE","COLO",6);
918   gMC->Gsatt("TSCE","SEEN",1);
919   gMC->Gsatt("TWES","SEEN",0);
920   gMC->Gsatt("TSWB","SEEN",0);
921   gMC->Gsatt("TPEL","SEEN",0);
922   gMC->Gsatt("TPMW","SEEN",1);
923   gMC->Gsatt("TESR","SEEN",1);
924   gMC->Gsatt("TPMW","COLO",12);
925   gMC->Gsatt("TIC1","COLO",5);
926   gMC->Gsatt("TOC1","COLO",5);
927   gMC->Gsatt("TESB","SEEN",0);
928   gMC->Gsatt("THVM","SEEN",1);
929   gMC->Gsatt("THVM","COLO",11);
930   gMC->Gsatt("THVH","SEEN",0);
931   gMC->Gsatt("TPSR","SEEN",0); 
932   gMC->Gsatt("THVL","SEEN",0);
933   gMC->Gsatt("THVC","SEEN",0);  
934   gMC->Gsatt("THVE","SEEN",0);
935   gMC->Gsatt("THVR","SEEN",0);
936
937   //
938   gMC->Gdopt("hide", "on");
939   gMC->Gdopt("shad", "on");
940   gMC->Gsatt("*", "fill", 7);
941   gMC->SetClipBox(".");
942   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
943   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
944   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
945   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
946   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
947   gMC->DefaultRange();
948   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
949   gMC->Gdhead(1111, "Time Projection Chamber");
950   gMC->Gdman(18, 4, "MAN");
951   gMC->Gdopt("hide","off");
952 }
953
954 //_____________________________________________________________________________
955 void AliTPCv3::CreateMaterials()
956 {
957   //
958   // Define materials for version 2 of the Time Projection Chamber
959   //
960
961
962   //
963   AliTPC::CreateMaterials();
964 }
965
966 //_____________________________________________________________________________
967 void AliTPCv3::Init()
968 {
969   //
970   // Initialises version 3 of the TPC after that it has been built
971   //
972   Int_t *idtmed = fIdtmed->GetArray();
973
974   AliTPC::Init();
975
976    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
977
978   gMC->SetMaxNStep(30000); // max. number of steps increased
979
980   gMC->Gstpar(idtmed[2],"LOSS",5);
981
982   printf("%s: *** TPC version 3 initialized***\n",ClassName());
983
984   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
985
986   // printf("*** TPC version 3 initialized ***\n");
987   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
988
989   //
990   
991 }
992
993 //_____________________________________________________________________________
994 void AliTPCv3::StepManager()
995 {
996   //
997   // Called for every step in the Time Projection Chamber
998   //
999
1000   //
1001   // parameters used for the energy loss calculations
1002   //
1003   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1004   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1005   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1006  
1007  
1008   const Float_t kbig = 1.e10;
1009
1010   Int_t id,copy;
1011   TLorentzVector pos;
1012   Float_t hits[5];
1013   Int_t vol[2];  
1014   
1015   vol[1]=0;
1016   vol[0]=0;
1017
1018   //
1019
1020   gMC->SetMaxStep(kbig);
1021   
1022   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1023   
1024   Float_t charge = gMC->TrackCharge();
1025   
1026   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1027   
1028   
1029   id=gMC->CurrentVolID(copy);
1030
1031   
1032   if (id != fIdSens) return;
1033   
1034   //
1035   //  charged particle is in the sensitive volume
1036   //
1037   
1038   if(gMC->TrackStep() > 0) {
1039
1040     
1041     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1042     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1043     
1044     gMC->TrackPosition(pos);
1045     hits[0]=pos[0];
1046     hits[1]=pos[1];
1047     hits[2]=pos[2];
1048
1049     // Get also the track time for pileup simulation
1050     hits[4]=gMC->TrackTime();
1051
1052     //
1053     // check the selected side of the TPC
1054     //
1055  
1056     if(fSide && fSide*hits[2]<=0.) return;
1057
1058     hits[3]=(Float_t)nel;
1059     
1060     // Add this hit
1061    
1062     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1063     
1064   } 
1065   
1066   // Stemax calculation for the next step
1067   
1068   Float_t pp;
1069   TLorentzVector mom;
1070   gMC->TrackMomentum(mom);
1071   Float_t ptot=mom.Rho();
1072   Float_t betaGamma = ptot/gMC->TrackMass();
1073   
1074   Int_t pid=gMC->TrackPid();
1075   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1076     { 
1077       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1078     }
1079   else
1080     {
1081       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); 
1082       pp=kprim*BetheBloch(betaGamma);    
1083       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1084     }
1085   
1086   Double_t rnd = gMC->GetRandom()->Rndm();
1087   
1088   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1089   
1090 }
1091
1092 //_____________________________________________________________________________
1093 Float_t AliTPCv3::BetheBloch(Float_t bg)
1094 {
1095   //
1096   // Bethe-Bloch energy loss formula
1097   //
1098   const Double_t kp1=0.76176e-1;
1099   const Double_t kp2=10.632;
1100   const Double_t kp3=0.13279e-4;
1101   const Double_t kp4=1.8631;
1102   const Double_t kp5=1.9479;
1103
1104   Double_t dbg = (Double_t) bg;
1105
1106   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1107
1108   Double_t aa = TMath::Power(beta,kp4);
1109   Double_t bb = TMath::Power(1./dbg,kp5);
1110
1111   bb=TMath::Log(kp3+bb);
1112   
1113   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1114 }