15 minutes interval for calculation of drift correction
[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 "AliMathBase.h"
45 #include "AliTPCDigitsArray.h"
46 #include "AliTPCParam.h"
47 #include "AliTPCParamSR.h"
48 #include "AliTPCTrackHitsV2.h"
49 #include "AliTPCv3.h"
50 #include "AliMC.h"
51 #include "TGeoManager.h"
52 #include "TGeoVolume.h"
53 #include "TGeoPcon.h"
54 #include "TGeoTube.h"
55 #include "TGeoPgon.h"
56 #include "TGeoTrd1.h"
57 #include "TGeoCompositeShape.h"
58 #include "TGeoPara.h"
59
60 ClassImp(AliTPCv3)
61 //_____________________________________________________________________________
62
63   AliTPCv3::AliTPCv3():AliTPC(),fIdSens(0)
64 {
65
66   fHitType = 1;
67
68
69
70 //_____________________________________________________________________________
71 AliTPCv3::AliTPCv3(const char *name, const char *title) :
72   AliTPC(name, title), fIdSens(0)
73 {
74   //
75   // Standard constructor for Time Projection Chamber version 3
76   //
77
78   SetBufferSize(128000);
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.,20); //20 sections
118   //
119   tpc->DefineSection(0,-291.,77.,278.);
120   tpc->DefineSection(1,-270,77.,278.);
121   //
122   tpc->DefineSection(2,-270.,77.,278.);
123   tpc->DefineSection(3,-259.6,70.,278.);
124   //
125   tpc->DefineSection(4,-259.6,68.1,278.);
126   tpc->DefineSection(5,-253.6,68.1,278.);
127   //
128   tpc->DefineSection(6,-253.6,68.,278.);
129   tpc->DefineSection(7,-74.0,60.8,278.);
130   //
131   tpc->DefineSection(8,-74.0,60.1,278.);
132   tpc->DefineSection(9,-73.3,60.1,278.);
133   //
134   tpc->DefineSection(10,-73.3,56.9,278.); 
135   tpc->DefineSection(11,73.3,56.9,278.);
136   //
137   tpc->DefineSection(12,73.3,60.1,278.);
138   tpc->DefineSection(13,74.0,60.1,278.);
139   //
140   tpc->DefineSection(14,74.0,60.8,278.);
141   tpc->DefineSection(15,253.6,65.5,278.);
142   //
143   tpc->DefineSection(16,253.6,65.6,278.);
144   tpc->DefineSection(17,259.6,65.6,278.);
145   //
146   tpc->DefineSection(18,259.6,70.0,278.);
147   tpc->DefineSection(19,291.,77.,278.);
148   //
149   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
150   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
151   //
152   // drift volume - sensitive volume, extended beyond the
153   // endcaps, because of the alignment
154   //
155   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
156   dvol->DefineSection(0,-260.,74.5,264.4);
157   dvol->DefineSection(1,-253.6,74.5,264.4);
158   //
159   dvol->DefineSection(2,-253.6,76.6774,258.);
160   dvol->DefineSection(3,253.6,76.6774,258.); 
161   //
162   dvol->DefineSection(4,253.6,74.5,264.4);
163   dvol->DefineSection(5,260.,74.5,264.4);
164   //
165   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
166   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
167   //
168   v1->AddNode(v9,1);
169   //
170   // outer insulator
171   //
172   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
173   //
174   tpco->DefineSection(0,-256.6,264.8,278.);
175   tpco->DefineSection(1,-253.6,264.8,278.);
176   //
177   tpco->DefineSection(2,-253.6,258.,278.);
178   tpco->DefineSection(3,250.6,258.,278.);
179   //
180   tpco->DefineSection(4,250.6,258.,275.5);
181   tpco->DefineSection(5,253.6,258.,275.5);
182   //
183   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
184   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
185   //
186   // outer containment vessel
187   //
188   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
189   //
190   tocv->DefineSection(0,-256.6,264.8,278.);
191   tocv->DefineSection(1,-253.6,264.8,278.);
192   //
193   tocv->DefineSection(2,-253.6,274.8124,278.);
194   tocv->DefineSection(3,247.6,274.8124,278.);  
195   //
196   tocv->DefineSection(4,247.6,270.4,278.);
197   tocv->DefineSection(5,250.6,270.4,278.);
198   //
199   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
200   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
201   //
202   TGeoTube *to1 = new TGeoTube(274.8174,277.995,252.1); //epoxy
203   TGeoTube *to2 = new TGeoTube(274.8274,277.985,252.1); //tedlar
204   TGeoTube *to3 = new TGeoTube(274.8312,277.9812,252.1);//prepreg2
205   TGeoTube *to4 = new TGeoTube(274.9062,277.9062,252.1);//nomex
206   //
207   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
208   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
209   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
210   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
211   //
212   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
213   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
214   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
215   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
216
217   //-------------------------------------------------------
218   //  Tpc Outer Field Cage
219   //  daughters - composite (sandwich)
220   //-------------------------------------------------------
221
222   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
223   //
224   tofc->DefineSection(0,-253.6,258.,269.6);
225   tofc->DefineSection(1,-250.6,258.,269.6);
226   //
227   tofc->DefineSection(2,-250.6,258.,260.0676); 
228   tofc->DefineSection(3,250.6,258.,260.0676);
229   //
230   tofc->DefineSection(4,250.6,258.,275.5);
231   tofc->DefineSection(5,253.6,258.,275.5);
232   //
233   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
234   //sandwich
235   TGeoTube *tf1 = new TGeoTube(258.0,260.0676,252.1); //tedlar
236   TGeoTube *tf2 = new TGeoTube(258.0038,260.0638,252.1); //prepreg3
237   TGeoTube *tf3 = new TGeoTube(258.0338,260.0338,252.1);//nomex
238   //
239   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
240   //
241   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
242   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
243   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
244   //
245   // outer part - positioning
246   //
247   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);
248   //
249   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);
250   //
251   v3->AddNode(tov1,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(tf1v,1);
252   //
253   v2->AddNode(v3,1); v2->AddNode(v4,1); 
254   //
255   v1->AddNode(v2,1);
256   //-----------------------------------------------------------
257
258
259
260
261
262
263   //--------------------------------------------------------------------
264   // Tpc Inner INsulator (CO2) 
265   // the cones, the central drum and the inner f.c. sandwich with a piece
266   // of the flane will be placed in the TPC
267   //--------------------------------------------------------------------
268   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
269   //
270   tpci->DefineSection(0,-253.6,68.4,76.6774);
271   tpci->DefineSection(1,-74.0,61.2,76.6774);
272   //
273   tpci->DefineSection(2,74.0,61.2,76.6774);  
274   //
275   tpci->DefineSection(3,253.6,65.9,76.6774);
276   //
277   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
278   //
279   // now the inner field cage - only part of flanges (2 copies)
280   //
281   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
282   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
283   //
284  //---------------------------------------------------------
285   // Tpc Inner Containment vessel - Muon side
286   //---------------------------------------------------------
287   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
288   //
289   tcms->DefineSection(0,-259.1,68.1,74.2);
290   tcms->DefineSection(1,-253.6,68.1,74.2);
291   //
292   tcms->DefineSection(2,-253.6,68.1,68.4);
293   tcms->DefineSection(3,-74.0,60.9,61.2);
294   //
295   tcms->DefineSection(4,-74.0,60.1,61.2);
296   tcms->DefineSection(5,-73.3,60.1,61.2);
297   //
298   tcms->DefineSection(6,-73.3,56.9,61.2);
299   tcms->DefineSection(7,-73.0,56.9,61.2);
300   //
301   tcms->DefineSection(8,-73.0,56.9,58.8);
302   tcms->DefineSection(9,-71.3,56.9,58.8);
303   //
304   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
305   //-----------------------------------------------
306   // inner containment vessel - shaft side
307   //-----------------------------------------------
308   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
309   //
310   tcss->DefineSection(0,71.3,56.9,58.8);
311   tcss->DefineSection(1,73.0,56.9,58.8);
312   //
313   tcss->DefineSection(2,73.0,56.9,61.2);
314   tcss->DefineSection(3,73.3,56.9,61.2);
315   //  
316   tcss->DefineSection(4,73.3,60.1,61.2);
317   tcss->DefineSection(5,74.0,60.1,61.2);
318   //
319   tcss->DefineSection(6,74.0,60.9,61.2);
320   tcss->DefineSection(7,253.6,65.6,65.9);
321   //
322   tcss->DefineSection(8,253.6,65.6,74.2);
323   tcss->DefineSection(9,258.1,65.6,74.2);
324   //
325   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
326   //-----------------------------------------------
327   //  Inner field cage
328   //  define 4 parts and make an assembly
329   //-----------------------------------------------
330   // part1 - Al - 2 copies
331   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
332   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
333   // sandwich - outermost parts - 2 copies
334   TGeoTube *t2 = new TGeoTube(76.6774,78.845,74.175); // tedlar 38 microns
335   TGeoTube *t3 = new TGeoTube(76.6812,78.8412,74.175); // prepreg2 500 microns
336   TGeoTube *t4 = new TGeoTube(76.7312,78.7912,74.175); // prepreg3 300 microns
337   TGeoTube *t5 = new TGeoTube(76.7612,78.7612,74.175); // nomex 2 cm
338   //
339   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
340   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
341   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
342   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
343   //
344   // middle parts - 2 copies
345   TGeoTube *t6 = new TGeoTube(76.6774,78.795,5.); // tedlar 38 microns
346   TGeoTube *t7 = new TGeoTube(76.6812,78.7912,5.); // prepreg2 250 microns
347   TGeoTube *t8 = new TGeoTube(76.7062,78.7662,5.); // prepreg3 300 microns
348   TGeoTube *t9 = new TGeoTube(76.7362,78.7362,5.); // nomex 2 cm
349   //
350   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
351   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
352   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
353   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
354   // central part - 1 copy
355   TGeoTube *t10 = new TGeoTube(76.6774,78.745,93.75); // tedlar 38 microns 
356   TGeoTube *t11 = new TGeoTube(76.6812,78.7412,93.75); // prepreg3 300 microns
357   TGeoTube *t12 = new TGeoTube(76.7112,78.7112,93.75); // nomex 2 cm
358   //
359   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
360   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
361   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
362   //
363   // inner part - positioning
364   //
365   // creating a sandwich
366   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
367   //
368   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
369   //
370   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
371   //
372   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC");
373   //
374   tv100->AddNode(tv10,1);
375   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75));
376   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75));
377   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925));
378   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
379   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
380   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
381   //
382   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
383   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
384   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
385   v9->AddNode(tv100,1);
386   //
387   // central drum 
388   //
389   // flange + sandwich
390   //
391   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
392   cfl->DefineSection(0,-71.1,59.7,61.2);
393   cfl->DefineSection(1,-68.6,59.7,61.2);
394   //
395   cfl->DefineSection(2,-68.6,60.6324,61.2);
396   cfl->DefineSection(3,68.6,60.6324,61.2); 
397   //
398   cfl->DefineSection(4,68.6,59.7,61.2);
399   cfl->DefineSection(5,71.1,59.7,61.2);  
400   //
401   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
402   // sandwich
403   TGeoTube *cd1 = new TGeoTube(60.6424,61.19,71.1);
404   TGeoTube *cd2 = new TGeoTube(60.6462,61.1862,71.1);
405   TGeoTube *cd3 = new TGeoTube(60.6662,61.1662,71.1);  
406   //
407   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
408   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
409   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
410   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm4); //nomex
411   //
412   // seals for central drum 2 copies
413   //
414   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
415   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
416   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
417   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
418   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
419   //
420   // seal collars 
421   TGeoPcon *se = new TGeoPcon(0.,360.,6);
422   se->DefineSection(0,-72.8,59.7,61.2);
423   se->DefineSection(1,-72.3,59.7,61.2);
424   //
425   se->DefineSection(2,-72.3,58.85,61.2);
426   se->DefineSection(3,-71.6,58.85,61.2); 
427   //
428   se->DefineSection(4,-71.6,59.7,61.2);
429   se->DefineSection(5,-71.3,59.7,61.2);  
430   //
431   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
432   //
433   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
434   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
435   //
436   // define reflection matrix 
437   //
438   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
439   //
440   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cflv->AddNode(cd1v,1);
441   //
442   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
443   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
444   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
445   //
446   // central membrane - 2 rings and a mylar membrane - assembly
447   //
448   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
449   TGeoTube *oh = new TGeoTube(250.,256.,.5);
450   TGeoTube *mem = new TGeoTube(84.05,250,0.01);
451   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
452   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
453   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
454   //
455   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
456   cm->AddNode(ihv,1);
457   cm->AddNode(ohv,1);
458   cm->AddNode(memv,1);
459   v9->AddNode(cm,1);
460   //
461   // end caps - they are make as an assembly of single segments
462   // containing both readout chambers
463   //
464   Double_t openingAngle = 10.*TMath::DegToRad();
465   Double_t thick=1.5; // rib
466   Double_t shift = thick/TMath::Sin(openingAngle);
467   //
468   Double_t lowEdge = 86.3; // hole in the wheel
469   Double_t upEdge = 240.4; // hole in the wheel
470   //
471   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
472   //
473   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
474   //
475   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
476   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
477   //
478   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
479   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
480   //
481   Double_t ys = shift*TMath::Sin(openingAngle); 
482   Double_t xs = shift*TMath::Cos(openingAngle);
483   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
484   tr->RegisterYourself();
485   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
486   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
487   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
488   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
489   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
490   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
491   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
492   //
493   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
494   //
495   // readout chambers
496   //
497   // IROC first
498   //
499    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
500    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
501   // empty space
502    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
503    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
504    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
505    //bars
506    Double_t tga = (19.8328-12.3742)/39.3;
507    Double_t xmin,xmax;
508    xmin = 9.55*tga+12.3742;
509    xmax = 9.95*tga+12.3742;
510    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
511    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
512    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
513    xmin=19.4*tga+12.3742;
514    xmax=19.9*tga+12.3742;
515    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
516    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
517    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
518    xmin=29.35*tga+12.3742;
519    xmax=29.75*tga+12.3742;
520    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
521    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
522    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
523    //
524    // holes for connectors
525    //
526    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
527    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
528    TString fileName(gSystem->Getenv("ALICE_ROOT"));
529    fileName += "/TPC/conn_iroc.dat";
530    ifstream in;
531    in.open(fileName.Data(), ios_base::in); // asci file
532    for(Int_t i =0;i<86;i++){
533       Double_t y = 3.99;
534       Double_t x,z,ang;
535       in>>x>>z>>ang;
536       z-=26.5;
537       TGeoRotation *rrr = new TGeoRotation();
538       rrr->RotateY(ang);
539       TGeoCombiTrans *trans = new TGeoCombiTrans("trans",x,y,z,rrr);
540       ibdv->AddNode(connv,i+1,trans);
541    }
542    in.close();
543    // "cap"
544    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
545    // "hole"
546    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
547    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
548    tr1->RegisterYourself();
549    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
550    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
551    //
552    // pad plane and wire fixations
553    //
554    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
555    TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
556    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
557    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
558    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
559    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
560    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
561    //
562    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
563    //
564    iroc->AddNode(ibdv,1);
565    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
566    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
567    tga =(23.3521-14.5974)/49.65; 
568    Double_t xx = 24.825*tga+14.5974-0.6;
569    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
570    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
571    //
572    // OROC
573    //
574    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
575    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
576    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
577    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
578    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
579    //horizontal bars
580    tga=(38.5084-20.2938)/99.3;
581    xmin=tga*10.2+20.2938;
582    xmax=tga*10.6+20.2938;
583    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
584    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
585    //
586    xmin=22.55*tga+20.2938;
587    xmax=24.15*tga+20.2938;
588    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
589    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
590    //
591    xmin=36.1*tga+20.2938;
592    xmax=36.5*tga+20.2938;
593    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
594    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
595    //
596    xmin=49.0*tga+20.2938;
597    xmax=50.6*tga+20.2938;   
598    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
599    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
600    //
601    xmin=63.6*tga+20.2938;
602    xmax=64.0*tga+20.2938;
603    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
604    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
605    //
606    xmin=75.5*tga+20.2938;
607    xmax=77.15*tga+20.2938;
608    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
609    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
610    //
611    xmin=88.7*tga+20.2938;
612    xmax=89.1*tga+20.2938;
613    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
614    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
615    //
616    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
617    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
618    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
619    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
620    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
621    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
622    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
623    // vertical bars
624    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
625    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
626    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
627    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
628    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
629    //
630    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
631    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
632    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
633    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
634    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
635    //
636    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
637    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
638    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
639    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
640    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
641    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
642    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
643    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
644    //
645    // holes for connectors
646    //
647    fileName = gSystem->Getenv("ALICE_ROOT");
648    fileName += "/TPC/conn_oroc.dat";
649    in.open(fileName.Data(), ios_base::in); // asci file
650    for(Int_t i =0;i<78;i++){
651       Double_t y =3.89;
652       Double_t x,z,ang;
653       Double_t x1,z1,x2,z2;
654       in>>x>>z>>ang;        
655       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
656       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
657       //
658       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
659       //
660       TGeoRotation *rr = new TGeoRotation();
661       rr->RotateY(ang); 
662       z1-=54.95;
663       z2-=54.95;
664       TGeoCombiTrans *trans1 = new TGeoCombiTrans("trans1",x1,y,z1,rr);
665       TGeoCombiTrans *trans2 = new TGeoCombiTrans("trans2",x2,y,z2,rr);
666       obdv->AddNode(connv,i+1,trans1);
667       obdv->AddNode(connv,i+79,trans2);
668    }
669    in.close();
670    // cap
671    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
672    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
673    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
674    tr5->RegisterYourself();
675    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
676    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
677    //
678    // pad plane and wire fixations
679    //
680    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
681    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
682    //
683    tga=(43.5239-23.3874)/114.2;
684    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
685    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
686    xx = 57.1*tga+23.3874-0.7;
687    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
688    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
689    //
690    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
691    //
692    oroc->AddNode(obdv,1);
693    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
694    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
695    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
696    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
697    // 
698    // now iroc and oroc are placed into a sector...
699    //
700    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
701    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
702    TGeoRotation rot1("rot1",90.,90.,0.);
703    TGeoRotation rot2("rot2");
704    rot2.RotateY(10.);
705    TGeoRotation *rot = new TGeoRotation("rot");
706    *rot=rot1*rot2;
707    //
708    Double_t x0,y0;
709    x0=110.2*TMath::Cos(openingAngle);
710    y0=110.2*TMath::Sin(openingAngle);
711    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side 
712    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
713    x0=188.45*TMath::Cos(openingAngle);
714    y0=188.45*TMath::Sin(openingAngle);
715    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
716    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
717    //
718    // A-side
719    //
720    secta->AddNode(ch,1);
721    secta->AddNode(iroc,1,combi1a);
722    secta->AddNode(oroc,1,combi2a);
723    //
724    // C-side
725    //
726    sectc->AddNode(ch,1);
727    sectc->AddNode(iroc,1,combi1c);
728    sectc->AddNode(oroc,1,combi2c);
729    //
730    // now I try to make  wheels...
731    //
732    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
733    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
734    //
735    for(Int_t i =0;i<18;i++){
736      Double_t phi = (20.*i);
737      TGeoRotation *r = new TGeoRotation();
738      r->RotateZ(phi);
739      wheela->AddNode(secta,i+1,r);
740      wheelc->AddNode(sectc,i+1,r);
741     
742    }
743    // wheels in the drift volume!
744    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
745    v9->AddNode(wheela,1,combi3);
746    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
747    
748    //_____________________________________________________________
749    // service support wheel
750    //_____________________________________________________________
751   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
752   sw->DefineSection(0,-4.,80.5,251.75);
753   sw->DefineSection(1,4.,80.5,251.75); 
754   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
755   //
756   thick=1.;
757   shift = thick/TMath::Sin(openingAngle);
758   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
759   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
760   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
761   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
762   //
763   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
764   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
765   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
766   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
767   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
768   //
769   shv->AddNode(elv,1);
770   //
771   ys = shift*TMath::Sin(openingAngle);
772   xs = shift*TMath::Cos(openingAngle);
773   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
774   // cover
775   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
776   co->DefineSection(0,-0.5,77.,255.25);
777   co->DefineSection(1,0.5,77.,255.25);
778   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
779   // hole in a cover
780   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
781   shift=4./TMath::Sin(openingAngle);
782   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
783   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
784   //
785   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
786   //
787   ys = shift*TMath::Sin(openingAngle);
788   xs = shift*TMath::Cos(openingAngle);  
789   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
790   //
791   // Sector as an Assembly
792   //
793   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
794   swhs->AddNode(swv,1);
795   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
796   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
797   //
798   // SSW as an Assembly of sectors
799   //
800  TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
801    for(Int_t i =0;i<18;i++){
802      Double_t phi = (20.*i);
803      TGeoRotation *r = new TGeoRotation();
804      r->RotateZ(phi);
805      swheel->AddNode(swhs,i+1,r);   
806    }
807    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
808    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
809    //
810   //----------------------------------------------------------
811   // TPc Support Rods - MAKROLON
812   //----------------------------------------------------------
813   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
814   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
815   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
816   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
817   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
818   // upper and lower rods differ in length!
819   Double_t *upar;
820   upar=NULL;
821   gGeoManager->Volume("TPC_Rod","TUBE",m6->GetId(),upar);
822   upar=new Double_t [3];
823   upar[0]=1.8;
824   upar[1]=2.2;
825   
826   //
827   //HV rods - makrolon + 0.58cm (diameter) Cu
828   TGeoTube *hvr = new TGeoTube(0.,2.2,126.64);
829   TGeoTube *hvc = new TGeoTube(0.,0.29,126.64);
830   //
831   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
832   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
833   hvrv->AddNode(hvcv,1);
834   //
835   // resistor rods
836   //
837   TGeoTube *cri = new TGeoTube(0.,0.45,126.64); //inner 
838   TGeoTube *cro = new TGeoTube(0.,0.45,126.54); //outer 
839   TGeoTube *cwi = new TGeoTube(0.,0.15,126.64); // water inner
840   TGeoTube *cwo = new TGeoTube(0.,0.15,126.54); // water outer
841   //
842   TGeoVolume *criv = new TGeoVolume("TPC_CR_I",cri,m10);
843   TGeoVolume *crov = new TGeoVolume("TPC_CR_O",cro,m10);    
844   TGeoVolume *cwiv = new TGeoVolume("TPC_W_I",cwi,m11);
845   TGeoVolume *cwov = new TGeoVolume("TPC_W_O",cwo,m11);   
846   //
847   // ceramic rod with water
848   //
849   criv->AddNode(cwiv,1); 
850   crov->AddNode(cwov,1);
851   //
852   TGeoTube *pri =new TGeoTube(0.2,0.35,126.64); //inner 
853   TGeoTube *pro = new TGeoTube(0.2,0.35,126.54); //outer    
854   //
855   // peek rod
856   //
857   TGeoVolume *priv = new TGeoVolume("TPC_PR_I",pri,m12);
858   TGeoVolume *prov = new TGeoVolume("TPC_PR_O",pro,m12); 
859   //
860   // resistor rods assembly
861   //
862    TGeoRotation *rotr = new TGeoRotation("rotr");
863    rotr->RotateZ(-21.);
864   //
865   TGeoTube *rri = new TGeoTube(1.8,2.2,126.64);//inner
866   TGeoTube *rro = new TGeoTube(1.8,2.2,126.54);//inner
867   //
868   TGeoVolume *rriv = new TGeoVolume("TPC_RR_I",rri,m6);
869   TGeoVolume *rrov = new TGeoVolume("TPC_RR_O",rro,m6);  
870   //
871   TGeoVolumeAssembly *rrin = new TGeoVolumeAssembly("TPC_RROD_I");
872   TGeoVolumeAssembly *rrou = new TGeoVolumeAssembly("TPC_RROD_O");
873   rrin->AddNode(rriv,1);
874   rrin->AddNode(criv,1,new TGeoTranslation(0.5,0.866, 0.));
875   rrin->AddNode(criv,2,new TGeoTranslation(0.5,-0.866, 0.)); 
876   rrin->AddNode(priv,1); 
877   //
878   rrou->AddNode(rrov,1);
879   rrou->AddNode(crov,1,new TGeoTranslation(0.5,0.866, 0.));
880   rrou->AddNode(crov,2,new TGeoTranslation(0.5,-0.866, 0.)); 
881   rrou->AddNode(prov,1);
882   for(Int_t i=0;i<18;i++){
883     Double_t angle,x,y;
884     Double_t z,r; 
885     angle=TMath::DegToRad()*20.*(Double_t)i;
886     r=81.5;
887     x=r * TMath::Cos(angle);
888     y=r * TMath::Sin(angle);
889     upar[2]=126.64; //lower
890     z= 126.96;
891     //
892     if(i==3){
893       v9->AddNode(rrin,1,new TGeoCombiTrans(x,y,z,rotr)); //A
894       v9->AddNode(rrin,2,new TGeoCombiTrans(x,y,-z,rotr)); //C 
895     } 
896     else { 
897       gGeoManager->Node("TPC_Rod",i+1,"TPC_Drift",x,y,z,0,kTRUE,upar,3);//shaft
898       gGeoManager->Node("TPC_Rod",i+19,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);//muon
899     }
900    
901
902     //
903     r=254.25;
904     x=r * TMath::Cos(angle);
905     y=r * TMath::Sin(angle);
906     upar[2]=126.54; //upper
907     z=127.06;
908     if(i==15){
909       //v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z));//A-side only
910       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,127.14));//A-side only
911       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
912     }
913     else if(i==11){
914       v9->AddNode(rrou,1,new TGeoCombiTrans(x,y,z,rotr)); //A
915       v9->AddNode(rrou,2,new TGeoCombiTrans(x,y,-z,rotr)); //C
916     }
917     else{
918     //
919       gGeoManager->Node("TPC_Rod",i+37,"TPC_Drift",x,y,z,0,kTRUE,upar,3);
920       gGeoManager->Node("TPC_Rod",i+55,"TPC_Drift",x,y,-z,0,kTRUE,upar,3);
921     }
922   }
923
924   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
925   alice->AddNode(v1,1);
926   
927
928  
929 } // end of function
930  
931 //_____________________________________________________________________________
932 void AliTPCv3::DrawDetector() const
933 {
934   //
935   // Draw a shaded view of the Time Projection Chamber version 3
936   //
937
938
939   // Set everything unseen
940   gMC->Gsatt("*", "seen", -1);
941   // 
942   // Set ALIC mother transparent
943   gMC->Gsatt("ALIC","SEEN",0);
944   //
945   // Set the volumes visible
946   //
947
948   gMC->Gsatt("TPC ","SEEN",0);
949   gMC->Gsatt("TOIN","SEEN",1);
950   gMC->Gsatt("TOIN","COLO",7);
951   gMC->Gsatt("TOCV","SEEN",1);
952   gMC->Gsatt("TOCV","COLO",4);
953   gMC->Gsatt("TSA1","SEEN",0);
954   gMC->Gsatt("TSA2","SEEN",0);
955   gMC->Gsatt("TSA3","SEEN",0);
956   gMC->Gsatt("TSA4","SEEN",0);  
957   gMC->Gsatt("TSA5","SEEN",0);
958   gMC->Gsatt("TOFC","SEEN",1);
959   gMC->Gsatt("TOFC","COLO",4);
960   gMC->Gsatt("TSA6","SEEN",0);
961   gMC->Gsatt("TSA7","SEEN",0);
962   gMC->Gsatt("TSA8","SEEN",0);    
963   gMC->Gsatt("TIIN","SEEN",1);
964   gMC->Gsatt("TIIN","COLO",7);
965   gMC->Gsatt("TII1","SEEN",0);
966   gMC->Gsatt("TIFC","SEEN",1);
967   gMC->Gsatt("TIFC","COLO",4);
968   gMC->Gsatt("TSA9","SEEN",0); 
969   gMC->Gsatt("TS10","SEEN",0);
970   gMC->Gsatt("TS11","SEEN",0);
971   gMC->Gsatt("TS12","SEEN",0);
972   gMC->Gsatt("TS13","SEEN",0);
973   gMC->Gsatt("TS14","SEEN",0);
974   gMC->Gsatt("TICC","SEEN",0);
975   gMC->Gsatt("TICM","SEEN",0);
976   gMC->Gsatt("TS15","SEEN",0);
977   gMC->Gsatt("TS16","SEEN",0);
978   gMC->Gsatt("TS17","SEEN",0);
979   gMC->Gsatt("TS18","SEEN",0);  
980   gMC->Gsatt("TS19","SEEN",0); 
981   gMC->Gsatt("TPJ1","SEEN",0);
982   gMC->Gsatt("TPJ2","SEEN",0);
983   gMC->Gsatt("TICS","SEEN",0);
984   gMC->Gsatt("TDGS","SEEN",0); 
985   gMC->Gsatt("TIRC","SEEN",0);
986   gMC->Gsatt("TIC1","SEEN",1);
987   gMC->Gsatt("TIPP","SEEN",0);
988   gMC->Gsatt("TIC3","SEEN",0);
989   gMC->Gsatt("TRCE","SEEN",0);
990   gMC->Gsatt("TPSC","SEEN",0);
991   gMC->Gsatt("TPCC","SEEN",0); 
992   gMC->Gsatt("TORC","SEEN",0);
993   gMC->Gsatt("TOPP","SEEN",0);
994   gMC->Gsatt("TOC3","SEEN",0);
995   gMC->Gsatt("TOC1","SEEN",1);
996   gMC->Gsatt("TSSW","SEEN",1);
997   gMC->Gsatt("TSWC","SEEN",1);
998   gMC->Gsatt("TSSW","COLO",3);
999   gMC->Gsatt("TSWC","COLO",3);
1000   gMC->Gsatt("TSCE","COLO",6);
1001   gMC->Gsatt("TSCE","SEEN",1);
1002   gMC->Gsatt("TWES","SEEN",0);
1003   gMC->Gsatt("TSWB","SEEN",0);
1004   gMC->Gsatt("TPEL","SEEN",0);
1005   gMC->Gsatt("TPMW","SEEN",1);
1006   gMC->Gsatt("TESR","SEEN",1);
1007   gMC->Gsatt("TPMW","COLO",12);
1008   gMC->Gsatt("TIC1","COLO",5);
1009   gMC->Gsatt("TOC1","COLO",5);
1010   gMC->Gsatt("TESB","SEEN",0);
1011   gMC->Gsatt("THVM","SEEN",1);
1012   gMC->Gsatt("THVM","COLO",11);
1013   gMC->Gsatt("THVH","SEEN",0);
1014   gMC->Gsatt("TPSR","SEEN",0); 
1015   gMC->Gsatt("THVL","SEEN",0);
1016   gMC->Gsatt("THVC","SEEN",0);  
1017   gMC->Gsatt("THVE","SEEN",0);
1018   gMC->Gsatt("THVR","SEEN",0);
1019
1020   //
1021   gMC->Gdopt("hide", "on");
1022   gMC->Gdopt("shad", "on");
1023   gMC->Gsatt("*", "fill", 7);
1024   gMC->SetClipBox(".");
1025   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1026   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1027   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1028   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1029   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1030   gMC->DefaultRange();
1031   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1032   gMC->Gdhead(1111, "Time Projection Chamber");
1033   gMC->Gdman(18, 4, "MAN");
1034   gMC->Gdopt("hide","off");
1035 }
1036
1037 //_____________________________________________________________________________
1038 void AliTPCv3::CreateMaterials()
1039 {
1040   //
1041   // Define materials for version 2 of the Time Projection Chamber
1042   //
1043
1044
1045   //
1046   AliTPC::CreateMaterials();
1047 }
1048
1049 //_____________________________________________________________________________
1050 void AliTPCv3::Init()
1051 {
1052   //
1053   // Initialises version 3 of the TPC after that it has been built
1054   //
1055   //Int_t *idtmed = fIdtmed->GetArray();
1056
1057   AliTPC::Init();
1058
1059    fIdSens=gMC->VolId("TPC_Drift"); // drift gas as a sensitive volume
1060
1061   gMC->SetMaxNStep(-30000); // max. number of steps increased
1062
1063   // specific energy loss is now set in galice.cuts
1064
1065   printf("%s: *** TPC version 3 initialized***\n",ClassName());
1066
1067   printf("%s: Maximum number of steps = %d\n",ClassName(),gMC->GetMaxNStep());
1068
1069   // printf("*** TPC version 3 initialized ***\n");
1070   // printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1071
1072   //
1073   
1074 }
1075
1076 //_____________________________________________________________________________
1077 void AliTPCv3::StepManager()
1078 {
1079   //
1080   // Called for every step in the Time Projection Chamber
1081   //
1082
1083   //
1084   // parameters used for the energy loss calculations
1085   //
1086   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1087   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1088   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1089  
1090  
1091   const Float_t kbig = 1.e10;
1092
1093   Int_t id,copy;
1094   TLorentzVector pos;
1095   Float_t hits[5];
1096   Int_t vol[2];  
1097   
1098   vol[1]=0;
1099   vol[0]=0;
1100
1101   //
1102
1103   gMC->SetMaxStep(kbig);
1104   
1105   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1106   
1107   Float_t charge = gMC->TrackCharge();
1108   
1109   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1110   
1111   
1112   id=gMC->CurrentVolID(copy);
1113
1114   
1115   if (id != fIdSens) return;
1116   
1117   //
1118   //  charged particle is in the sensitive volume
1119   //
1120   
1121   if(gMC->TrackStep() > 0) {
1122
1123     
1124     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1125     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1126     
1127     gMC->TrackPosition(pos);
1128     hits[0]=pos[0];
1129     hits[1]=pos[1];
1130     hits[2]=pos[2];
1131
1132     // Get also the track time for pileup simulation
1133     hits[4]=gMC->TrackTime();
1134
1135     //
1136     // check the selected side of the TPC
1137     //
1138  
1139     if(fSide && fSide*hits[2]<=0.) return;
1140
1141     hits[3]=(Float_t)nel;
1142     
1143     // Add this hit
1144    
1145     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  //MI change
1146     
1147   } 
1148   
1149   // Stemax calculation for the next step
1150   
1151   Float_t pp;
1152   TLorentzVector mom;
1153   gMC->TrackMomentum(mom);
1154   Float_t ptot=mom.Rho();
1155   Float_t betaGamma = ptot/gMC->TrackMass();
1156   
1157   Int_t pid=gMC->TrackPid();
1158   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1159     { 
1160       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1161     }
1162   else
1163     {
1164       betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); 
1165       pp=kprim*AliMathBase::BetheBlochAleph(betaGamma);    
1166       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1167     }
1168   
1169   Double_t rnd = gMC->GetRandom()->Rndm();
1170   
1171   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1172   
1173 }