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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 2 -- detailed TPC and slow simulation    //
22 //                                                                           //
23 //Begin_Html
24 /*
25 <img src="picts/AliTPCv2Class.gif">
26 */
27 //End_Html
28 //                                                                           //
29 //                                                                           //
30 ///////////////////////////////////////////////////////////////////////////////
31
32 //#include <stdlib.h>
33
34 #include <TLorentzVector.h>
35 #include <TPDGCode.h>
36 #include <TString.h>
37 #include "AliLog.h"
38 #include "AliMathBase.h"
39 #include "AliTrackReference.h"
40 #include "AliTPCParam.h"
41 #include "AliTPCTrackHitsV2.h"
42 #include "AliTPCv2.h"
43 #include "AliGeomManager.h"
44 #include "TGeoVolume.h"
45 #include "TGeoPcon.h"
46 #include "TGeoTube.h"
47 #include "TGeoPgon.h"
48 #include "TGeoTrd1.h"
49 #include "TGeoCompositeShape.h"
50 #include "TGeoPara.h"
51 #include "TGeoPhysicalNode.h"
52 #include "TGeoHalfSpace.h"
53 #include "TTreeStream.h"
54
55 ClassImp(AliTPCv2)
56  
57 //_____________________________________________________________________________
58 AliTPCv2::AliTPCv2(const char *name, const char *title) :
59   AliTPC(name, title),
60   fIdSens(0),
61   fIDrift(0),
62   fSecOld(0) 
63 {
64   //
65   // Standard constructor for Time Projection Chamber version 2
66   //
67
68
69   SetBufferSize(128000);
70
71
72 //   if (fTPCParam)
73 //      fTPCParam->Write(fTPCParam->GetTitle());
74 }
75  
76 //_____________________________________________________________________________
77 void AliTPCv2::CreateGeometry()
78 {
79   //
80   // Create the geometry of Time Projection Chamber version 2
81   //
82   //Begin_Html
83   /*
84     <img src="picts/AliTPC.gif">
85   */
86   //End_Html
87   //Begin_Html
88   /*
89     <img src="picts/AliTPCv2Tree.gif">
90   */
91   //End_Html
92
93   //----------------------------------------------------------
94   // This geometry is written using TGeo class
95   // Firstly the shapes are defined, and only then the volumes
96   // What is recognized by the MC are volumes
97   //----------------------------------------------------------
98   //
99   //  tpc - this will be the mother volume
100   //
101
102   //
103   // here I define a volume TPC
104   // retrive the medium name with "TPC_" as a leading string
105   //
106   TGeoPcon *tpc = new TGeoPcon(0.,360.,20); //20 sections
107   //
108   tpc->DefineSection(0,-291.,77.,278.);
109   tpc->DefineSection(1,-270,77.,278.);
110   //
111   tpc->DefineSection(2,-270.,77.,278.);
112   tpc->DefineSection(3,-259.6,70.,278.);
113   //
114   tpc->DefineSection(4,-259.6,68.1,278.);
115   tpc->DefineSection(5,-253.6,68.1,278.);
116   //
117   tpc->DefineSection(6,-253.6,68.,278.);
118   tpc->DefineSection(7,-74.0,60.8,278.);
119   //
120   tpc->DefineSection(8,-74.0,60.1,278.);
121   tpc->DefineSection(9,-73.3,60.1,278.);
122   //
123   tpc->DefineSection(10,-73.3,56.9,278.); 
124   tpc->DefineSection(11,73.3,56.9,278.);
125   //
126   tpc->DefineSection(12,73.3,60.1,278.);
127   tpc->DefineSection(13,74.0,60.1,278.);
128   //
129   tpc->DefineSection(14,74.0,60.8,278.);
130   tpc->DefineSection(15,253.6,65.5,278.);
131   //
132   tpc->DefineSection(16,253.6,65.6,278.);
133   tpc->DefineSection(17,259.6,65.6,278.);
134   //
135   tpc->DefineSection(18,259.6,70.0,278.);
136   tpc->DefineSection(19,291.,77.,278.);
137   //
138   TGeoMedium *m1 = gGeoManager->GetMedium("TPC_Air");
139   TGeoVolume *v1 = new TGeoVolume("TPC_M",tpc,m1);
140   //
141   // drift volume - sensitive volume, extended beyond the
142   // endcaps, because of the alignment
143   //
144   TGeoPcon *dvol = new TGeoPcon(0.,360.,6);
145   dvol->DefineSection(0,-260.,74.5,264.4);
146   dvol->DefineSection(1,-253.6,74.5,264.4);
147   //
148   dvol->DefineSection(2,-253.6,76.6774,258.);
149   dvol->DefineSection(3,253.6,76.6774,258.); 
150   //
151   dvol->DefineSection(4,253.6,74.5,264.4);
152   dvol->DefineSection(5,260.,74.5,264.4);
153   //
154   TGeoMedium *m5 = gGeoManager->GetMedium("TPC_Ne-CO2-N-2");
155   TGeoVolume *v9 = new TGeoVolume("TPC_Drift",dvol,m5);
156   //
157   v1->AddNode(v9,1);
158   //
159   // outer insulator
160   //
161   TGeoPcon *tpco = new TGeoPcon(0.,360.,6); //insulator
162   //
163   tpco->DefineSection(0,-256.6,264.8,278.);
164   tpco->DefineSection(1,-253.6,264.8,278.);
165   //
166   tpco->DefineSection(2,-253.6,258.,278.);
167   tpco->DefineSection(3,250.6,258.,278.);
168   //
169   tpco->DefineSection(4,250.6,258.,275.5);
170   tpco->DefineSection(5,253.6,258.,275.5);
171   //
172   TGeoMedium *m2 = gGeoManager->GetMedium("TPC_CO2");
173   TGeoVolume *v2 = new TGeoVolume("TPC_OI",tpco,m2);
174   //
175   TGeoRotation *segrot;//segment rotations
176   //
177   // outer containment vessel
178   //
179   TGeoPcon *tocv = new TGeoPcon(0.,360.,6);  // containment vessel
180   //
181   tocv->DefineSection(0,-256.6,264.8,278.);
182   tocv->DefineSection(1,-253.6,264.8,278.);
183   //
184   tocv->DefineSection(2,-253.6,274.8124,278.);
185   tocv->DefineSection(3,247.6,274.8124,278.);  
186   //
187   tocv->DefineSection(4,247.6,270.4,278.);
188   tocv->DefineSection(5,250.6,270.4,278.);
189   //
190   TGeoMedium *m3 = gGeoManager->GetMedium("TPC_Al");
191   TGeoVolume *v3 = new TGeoVolume("TPC_OCV",tocv,m3); 
192   //
193   TGeoTubeSeg *to1 = new TGeoTubeSeg(274.8174,277.995,252.1,0.,59.9); //epoxy
194   TGeoTubeSeg *to2 = new TGeoTubeSeg(274.8274,277.985,252.1,0.,59.9); //tedlar
195   TGeoTubeSeg *to3 = new TGeoTubeSeg(274.8312,277.9812,252.1,0.,59.9);//prepreg2
196   TGeoTubeSeg *to4 = new TGeoTubeSeg(274.9062,277.9062,252.1,0.,59.9);//nomex
197   TGeoTubeSeg *tog5 = new TGeoTubeSeg(274.8174,277.995,252.1,59.9,60.);//epoxy
198   //
199   TGeoMedium *sm1 = gGeoManager->GetMedium("TPC_Epoxy");
200   TGeoMedium *sm2 = gGeoManager->GetMedium("TPC_Tedlar");
201   TGeoMedium *sm3 = gGeoManager->GetMedium("TPC_Prepreg2");
202   TGeoMedium *sm4 = gGeoManager->GetMedium("TPC_Nomex");
203   //
204   TGeoVolume *tov1 = new TGeoVolume("TPC_OCV1",to1,sm1);
205   TGeoVolume *tov2 = new TGeoVolume("TPC_OCV2",to2,sm2);
206   TGeoVolume *tov3 = new TGeoVolume("TPC_OCV3",to3,sm3);
207   TGeoVolume *tov4 = new TGeoVolume("TPC_OCV4",to4,sm4);
208   TGeoVolume *togv5 = new TGeoVolume("TPC_OCVG5",tog5,sm1);
209   //-------------------------------------------------------
210   //  Tpc Outer Field Cage
211   //  daughters - composite (sandwich)
212   //-------------------------------------------------------
213
214   TGeoPcon *tofc = new TGeoPcon(0.,360.,6);
215   //
216   tofc->DefineSection(0,-253.6,258.,269.6);
217   tofc->DefineSection(1,-250.6,258.,269.6);
218   //
219   tofc->DefineSection(2,-250.6,258.,260.0676); 
220   tofc->DefineSection(3,250.6,258.,260.0676);
221   //
222   tofc->DefineSection(4,250.6,258.,275.5);
223   tofc->DefineSection(5,253.6,258.,275.5);
224   //
225   TGeoVolume *v4 = new TGeoVolume("TPC_TOFC",tofc,m3); 
226   //sandwich
227   TGeoTubeSeg *tf1 = new TGeoTubeSeg(258.0,260.0676,252.1,0.,59.9); //tedlar
228   TGeoTubeSeg *tf2 = new TGeoTubeSeg(258.0038,260.0638,252.1,0.,59.9); //prepreg3
229   TGeoTubeSeg *tf3 = new TGeoTubeSeg(258.0338,260.0338,252.1,0.,59.9);//nomex
230   TGeoTubeSeg *tfg4 = new TGeoTubeSeg(258.0,260.0676,252.1,59.9,60.); //epoxy glue
231   //
232   TGeoMedium *sm5 = gGeoManager->GetMedium("TPC_Prepreg3");
233   //
234   TGeoVolume *tf1v = new TGeoVolume("TPC_OFC1",tf1,sm2);
235   TGeoVolume *tf2v = new TGeoVolume("TPC_OFC2",tf2,sm5);
236   TGeoVolume *tf3v = new TGeoVolume("TPC_OFC3",tf3,sm4);
237   TGeoVolume *tfg4v = new TGeoVolume("TPC_OFCG4",tfg4,sm1);
238   //
239   // outer part - positioning
240   //
241   tov1->AddNode(tov2,1); tov2->AddNode(tov3,1); tov3->AddNode(tov4,1);//ocv
242   //
243   tf1v->AddNode(tf2v,1); tf2v->AddNode(tf3v,1);//ofc
244   //
245   TGeoVolumeAssembly *t200 = new TGeoVolumeAssembly("TPC_OCVSEG");
246   TGeoVolumeAssembly *t300 = new TGeoVolumeAssembly("TPC_OFCSEG");
247   //
248   // assembly OCV and OFC
249   //
250   // 1st - no rotation
251   t200->AddNode(tov1,1); t200->AddNode(togv5,1);
252   t300->AddNode(tf1v,1); t300->AddNode(tfg4v,1);
253   // 2nd - rotation 60 deg
254   segrot = new TGeoRotation();
255   segrot->RotateZ(60.);
256   t200->AddNode(tov1,2,segrot); t200->AddNode(togv5,2,segrot);
257   t300->AddNode(tf1v,2,segrot); t300->AddNode(tfg4v,2,segrot);
258   // 3rd rotation 120 deg
259   segrot = new TGeoRotation();
260   segrot->RotateZ(120.);
261   t200->AddNode(tov1,3,segrot); t200->AddNode(togv5,3,segrot);
262   t300->AddNode(tf1v,3,segrot); t300->AddNode(tfg4v,3,segrot);
263   //4th rotation 180 deg
264   segrot = new TGeoRotation();
265   segrot->RotateZ(180.);
266   t200->AddNode(tov1,4,segrot); t200->AddNode(togv5,4,segrot);
267   t300->AddNode(tf1v,4,segrot); t300->AddNode(tfg4v,4,segrot);
268   //5th rotation 240 deg
269   segrot = new TGeoRotation();
270   segrot->RotateZ(240.);
271   t200->AddNode(tov1,5,segrot); t200->AddNode(togv5,5,segrot);
272   t300->AddNode(tf1v,5,segrot); t300->AddNode(tfg4v,5,segrot);
273   //6th rotation 300 deg
274   segrot = new TGeoRotation();
275   segrot->RotateZ(300.);
276   t200->AddNode(tov1,6,segrot); t200->AddNode(togv5,6,segrot);
277   t300->AddNode(tf1v,6,segrot); t300->AddNode(tfg4v,6,segrot);
278   //
279   v3->AddNode(t200,1,new TGeoTranslation(0.,0.,-1.5)); v4->AddNode(t300,1);
280   //
281   v2->AddNode(v3,1); v2->AddNode(v4,1); 
282   //
283   v1->AddNode(v2,1);
284   //--------------------------------------------------------------------
285   // Tpc Inner INsulator (CO2) 
286   // the cones, the central drum and the inner f.c. sandwich with a piece
287   // of the flane will be placed in the TPC
288   //--------------------------------------------------------------------
289   TGeoPcon *tpci = new TGeoPcon(0.,360.,4);
290   //
291   tpci->DefineSection(0,-253.6,68.4,76.6774);
292   tpci->DefineSection(1,-74.0,61.2,76.6774);
293   //
294   tpci->DefineSection(2,74.0,61.2,76.6774);  
295   //
296   tpci->DefineSection(3,253.6,65.9,76.6774);
297   //
298   TGeoVolume *v5 = new TGeoVolume("TPC_INI",tpci,m2);
299   //
300   // now the inner field cage - only part of flanges (2 copies)
301   //
302   TGeoTube *tif1 = new TGeoTube(69.9,76.6774,1.5); 
303   TGeoVolume *v6 = new TGeoVolume("TPC_IFC1",tif1,m3);
304   //
305  //---------------------------------------------------------
306   // Tpc Inner Containment vessel - Muon side
307   //---------------------------------------------------------
308   TGeoPcon *tcms = new TGeoPcon(0.,360.,10);
309   //
310   tcms->DefineSection(0,-259.1,68.1,74.2);
311   tcms->DefineSection(1,-253.6,68.1,74.2);
312   //
313   tcms->DefineSection(2,-253.6,68.1,68.4);
314   tcms->DefineSection(3,-74.0,60.9,61.2);
315   //
316   tcms->DefineSection(4,-74.0,60.1,61.2);
317   tcms->DefineSection(5,-73.3,60.1,61.2);
318   //
319   tcms->DefineSection(6,-73.3,56.9,61.2);
320   tcms->DefineSection(7,-73.0,56.9,61.2);
321   //
322   tcms->DefineSection(8,-73.0,56.9,58.8);
323   tcms->DefineSection(9,-71.3,56.9,58.8);
324   //
325   TGeoVolume *v7 = new TGeoVolume("TPC_ICVM",tcms,m3);
326   //-----------------------------------------------
327   // inner containment vessel - shaft side
328   //-----------------------------------------------
329   TGeoPcon *tcss = new TGeoPcon(0.,360.,10);
330   //
331   tcss->DefineSection(0,71.3,56.9,58.8);
332   tcss->DefineSection(1,73.0,56.9,58.8);
333   //
334   tcss->DefineSection(2,73.0,56.9,61.2);
335   tcss->DefineSection(3,73.3,56.9,61.2);
336   //  
337   tcss->DefineSection(4,73.3,60.1,61.2);
338   tcss->DefineSection(5,74.0,60.1,61.2);
339   //
340   tcss->DefineSection(6,74.0,60.9,61.2);
341   tcss->DefineSection(7,253.6,65.6,65.9);
342   //
343   tcss->DefineSection(8,253.6,65.6,74.2);
344   tcss->DefineSection(9,258.1,65.6,74.2);
345   //
346   TGeoVolume *v8 = new TGeoVolume("TPC_ICVS",tcss,m3);
347   //-----------------------------------------------
348   //  Inner field cage
349   //  define 4 parts and make an assembly
350   //-----------------------------------------------
351   // part1 - Al - 2 copies
352   TGeoTube *t1 = new TGeoTube(76.6774,78.845,0.75);
353   TGeoVolume *tv1 = new TGeoVolume("TPC_IFC2",t1,m3);
354   // sandwich - outermost parts - 2 copies
355   //
356   // segment outermost
357   //
358   TGeoTubeSeg *t2 = new TGeoTubeSeg(76.6774,78.845,74.175,350.,109.4); // tedlar 38 microns
359   TGeoTubeSeg *t3 = new TGeoTubeSeg(76.6812,78.8412,74.175,350.,109.4); // prepreg2 500 microns
360   TGeoTubeSeg *t4 = new TGeoTubeSeg(76.7312,78.7912,74.175,350.,109.4); // prepreg3 300 microns
361   TGeoTubeSeg *t5 = new TGeoTubeSeg(76.7612,78.7612,74.175,350.,109.4); // nomex 2 cm
362   TGeoTubeSeg *tepox1 = new TGeoTubeSeg(76.6774,78.845,74.175,109.4,110.);//epoxy
363   TGeoTubeSeg *tpr1 = new TGeoTubeSeg(78.845,78.885,74.175,109.,111.);
364   
365   // volumes for the outer part  
366   TGeoVolume *tv2 = new TGeoVolume("TPC_IFC3",t2,sm2);
367   TGeoVolume *tv3 = new TGeoVolume("TPC_IFC4",t3,sm3);
368   TGeoVolume *tv4 = new TGeoVolume("TPC_IFC5",t4,sm5);
369   TGeoVolume *tv5 = new TGeoVolume("TPC_IFC6",t5,sm4);
370   TGeoVolume *tvep1 = new TGeoVolume("TPC_IFEPOX1",tepox1,sm1); 
371   TGeoVolume *tvpr1 = new TGeoVolume("TPC_PRSTR1",tpr1,sm2); 
372   //
373   // middle parts - 2 copies
374   //
375   // segment middle
376   //
377   TGeoTubeSeg *t6 = new TGeoTubeSeg(76.6774,78.795,5.,350.,109.4); // tedlar 38 microns
378   TGeoTubeSeg *t7 = new TGeoTubeSeg(76.6812,78.7912,5.,350.,109.4); // prepreg2 250 microns
379   TGeoTubeSeg *t8 = new TGeoTubeSeg(76.7062,78.7662,5.,350.,109.4); // prepreg3 300 microns
380   TGeoTubeSeg *t9 = new TGeoTubeSeg(76.7362,78.7362,5.,350.,109.4); // nomex 2 cm
381   TGeoTubeSeg *tepox2 = new TGeoTubeSeg(76.6774,78.795,5.,109.4,110.);//epoxy
382   TGeoTubeSeg *tpr2 = new TGeoTubeSeg(78.795,78.835,5.,109.,111.);
383   // volumes for the middle part
384   TGeoVolume *tv6 = new TGeoVolume("TPC_IFC7",t6,sm2);
385   TGeoVolume *tv7 = new TGeoVolume("TPC_IFC8",t7,sm3);
386   TGeoVolume *tv8 = new TGeoVolume("TPC_IFC9",t8,sm5);
387   TGeoVolume *tv9 = new TGeoVolume("TPC_IFC10",t9,sm4);
388   TGeoVolume *tvep2 = new TGeoVolume("TPC_IFEPOX2",tepox2,sm1);
389   TGeoVolume *tvpr2 = new TGeoVolume("TPC_PRSTR2",tpr2,sm2);
390   // central part - 1 copy
391   // 
392   // segment central part
393   //
394   TGeoTubeSeg *t10 = new TGeoTubeSeg(76.6774,78.785,93.75,350.,109.4); // tedlar 38 microns 
395   TGeoTubeSeg *t11 = new TGeoTubeSeg(76.6812,78.7812,93.75,350.,109.4); // prepreg3 500 microns
396   TGeoTubeSeg *t12 = new TGeoTubeSeg(76.7312,78.7312,93.75,350.,109.4); // nomex 2 cm 
397   TGeoTubeSeg *tepox3 = new TGeoTubeSeg(76.6774,78.785,93.75,109.4,110.);//epoxy
398   TGeoTubeSeg *tpr3 = new TGeoTubeSeg(78.785,78.825,93.75,109.,111.);
399   // volumes for the central part
400   TGeoVolume *tv10 = new TGeoVolume("TPC_IFC11",t10,sm2);
401   TGeoVolume *tv11 = new TGeoVolume("TPC_IFC12",t11,sm5);
402   TGeoVolume *tv12 = new TGeoVolume("TPC_IFC13",t12,sm4);
403   TGeoVolume *tvep3 = new TGeoVolume("TPC_IFEPOX3",tepox3,sm1);
404   TGeoVolume *tvpr3 = new TGeoVolume("TPC_PRSTR3",tpr3,sm2);  
405   //
406   // creating a sandwich for the outer par,t tv2 is the mother
407   //
408   tv2->AddNode(tv3,1); tv3->AddNode(tv4,1); tv4->AddNode(tv5,1);
409   //
410   // creating a sandwich for the middle part, tv6 is the mother
411   //
412   tv6->AddNode(tv7,1); tv7->AddNode(tv8,1); tv8->AddNode(tv9,1);
413   //
414   // creating a sandwich for the central part, tv10 is the mother
415   //
416   tv10->AddNode(tv11,1); tv11->AddNode(tv12,1);
417   //
418   TGeoVolumeAssembly *tv100 = new TGeoVolumeAssembly("TPC_IFC"); // ifc itself - 3 segments
419
420   //
421   // first segment - no rotation
422   //
423   // central
424   tv100->AddNode(tv10,1); //sandwich
425   tv100->AddNode(tvep3,1);//epoxy
426   tv100->AddNode(tvpr3,1);//prepreg strip                                    
427   // middle
428   tv100->AddNode(tv6,1,new TGeoTranslation(0.,0.,-98.75)); //sandwich1
429   tv100->AddNode(tv6,2,new TGeoTranslation(0.,0.,98.75)); // sandwich2
430   tv100->AddNode(tvep2,1,new TGeoTranslation(0.,0.,-98.75)); //epoxy
431   tv100->AddNode(tvep2,2,new TGeoTranslation(0.,0.,98.75)); //epoxy
432   tv100->AddNode(tvpr2,1,new TGeoTranslation(0.,0.,-98.75));//prepreg strip
433   tv100->AddNode(tvpr2,2,new TGeoTranslation(0.,0.,98.75));
434   // outer
435   tv100->AddNode(tv2,1,new TGeoTranslation(0.,0.,-177.925)); //sandwich
436   tv100->AddNode(tv2,2,new TGeoTranslation(0.,0.,177.925));
437   tv100->AddNode(tvep1,1,new TGeoTranslation(0.,0.,-177.925)); //epoxy
438   tv100->AddNode(tvep1,2,new TGeoTranslation(0.,0.,177.925));
439   tv100->AddNode(tvpr1,1,new TGeoTranslation(0.,0.,-177.925));//prepreg strip
440   tv100->AddNode(tvpr1,2,new TGeoTranslation(0.,0.,-177.925));
441   //
442   // second segment - rotation 120 deg.
443   //
444   segrot = new TGeoRotation();
445   segrot->RotateZ(120.);
446   //
447   // central    
448   tv100->AddNode(tv10,2,segrot); //sandwich
449   tv100->AddNode(tvep3,2,segrot);//epoxy
450   tv100->AddNode(tvpr3,2,segrot);//prepreg strip
451   // middle
452   tv100->AddNode(tv6,3,new TGeoCombiTrans(0.,0.,-98.75,segrot)); //sandwich1
453   tv100->AddNode(tv6,4,new TGeoCombiTrans(0.,0.,98.75,segrot)); // sandwich2
454   tv100->AddNode(tvep2,3,new TGeoCombiTrans(0.,0.,-98.75,segrot)); //epoxy
455   tv100->AddNode(tvep2,4,new TGeoCombiTrans(0.,0.,98.75,segrot)); //epoxy
456   tv100->AddNode(tvpr2,3,new TGeoCombiTrans(0.,0.,-98.75,segrot));//prepreg strip
457   tv100->AddNode(tvpr2,4,new TGeoCombiTrans(0.,0.,98.75,segrot));
458   //outer
459   tv100->AddNode(tv2,3,new TGeoCombiTrans(0.,0.,-177.925,segrot));//sandwich
460   tv100->AddNode(tv2,4,new TGeoCombiTrans(0.,0.,177.925,segrot));
461   tv100->AddNode(tvep1,3,new TGeoCombiTrans(0.,0.,-177.925,segrot));//epoxy
462   tv100->AddNode(tvep1,4,new TGeoCombiTrans(0.,0.,177.925,segrot));
463   tv100->AddNode(tvpr1,3,new TGeoCombiTrans(0.,0.,-177.925,segrot));//prepreg strip
464   tv100->AddNode(tvpr1,4,new TGeoCombiTrans(0.,0.,177.925,segrot));
465   //
466   //  third segment - rotation 240 deg.
467   //
468   segrot = new TGeoRotation();
469   segrot->RotateZ(240.);
470   //
471   // central    
472   tv100->AddNode(tv10,3,segrot); //sandwich
473   tv100->AddNode(tvep3,3,segrot);//epoxy
474   tv100->AddNode(tvpr3,3,segrot);//prepreg strip
475   // middle
476   tv100->AddNode(tv6,5,new TGeoCombiTrans(0.,0.,-98.75,segrot)); //sandwich1
477   tv100->AddNode(tv6,6,new TGeoCombiTrans(0.,0.,98.75,segrot)); // sandwich2
478   tv100->AddNode(tvep2,5,new TGeoCombiTrans(0.,0.,-98.75,segrot)); //epoxy
479   tv100->AddNode(tvep2,6,new TGeoCombiTrans(0.,0.,98.75,segrot)); //epoxy
480   tv100->AddNode(tvpr2,5,new TGeoCombiTrans(0.,0.,-98.75,segrot));//prepreg strip
481   tv100->AddNode(tvpr2,6,new TGeoCombiTrans(0.,0.,98.75,segrot));
482   //outer
483   tv100->AddNode(tv2,5,new TGeoCombiTrans(0.,0.,-177.925,segrot));//sandwich
484   tv100->AddNode(tv2,6,new TGeoCombiTrans(0.,0.,177.925,segrot));
485   tv100->AddNode(tvep1,5,new TGeoCombiTrans(0.,0.,-177.925,segrot));//epoxy
486   tv100->AddNode(tvep1,6,new TGeoCombiTrans(0.,0.,177.925,segrot));
487   tv100->AddNode(tvpr1,5,new TGeoCombiTrans(0.,0.,-177.925,segrot));//prepreg strip
488   tv100->AddNode(tvpr1,6,new TGeoCombiTrans(0.,0.,177.925,segrot));
489   // Al parts - rings
490   tv100->AddNode(tv1,1,new TGeoTranslation(0.,0.,-252.85));
491   tv100->AddNode(tv1,2,new TGeoTranslation(0.,0.,252.85));
492   //
493   v5->AddNode(v6,1, new TGeoTranslation(0.,0.,-252.1));
494   v5->AddNode(v6,2, new TGeoTranslation(0.,0.,252.1));
495   v1->AddNode(v5,1); v1->AddNode(v7,1); v1->AddNode(v8,1); 
496   v9->AddNode(tv100,1);
497   //
498   // central drum 
499   //
500   // flange + sandwich
501   //
502   TGeoPcon *cfl = new TGeoPcon(0.,360.,6);
503   cfl->DefineSection(0,-71.1,59.7,61.2);
504   cfl->DefineSection(1,-68.6,59.7,61.2);
505   //
506   cfl->DefineSection(2,-68.6,60.6124,61.2);
507   cfl->DefineSection(3,68.6,60.6124,61.2); 
508   //
509   cfl->DefineSection(4,68.6,59.7,61.2);
510   cfl->DefineSection(5,71.1,59.7,61.2);  
511   //
512   TGeoVolume *cflv = new TGeoVolume("TPC_CDR",cfl,m3);
513   // sandwich
514   TGeoTubeSeg *cd1 = new TGeoTubeSeg(60.6224,61.19,71.1,0.1,119.9);
515   TGeoTubeSeg *cd2 = new TGeoTubeSeg(60.6262,61.1862,71.1,0.1,119.9);
516   TGeoTubeSeg *cd3 = new TGeoTubeSeg(60.6462,61.1662,71.1,0.1,119.9);
517   TGeoTubeSeg *cd4 = new TGeoTubeSeg(60.6562,61.1562,71.1,0.1,119.9);
518   TGeoTubeSeg *tepox4 = new TGeoTubeSeg(60.6224,61.19,71.1,359.9,0.1);
519   //  TGeoTube *cd1 = new TGeoTube(60.6224,61.19,71.1);
520   //  TGeoTube *cd2 = new TGeoTube(60.6262,61.1862,71.1);
521   //  TGeoTube *cd3 = new TGeoTube(60.6462,61.1662,71.1);  
522   //  TGeoTube *cd4 = new TGeoTube(60.6562,61.1562,71.1);  
523   //
524   TGeoMedium *sm6 = gGeoManager->GetMedium("TPC_Prepreg1");
525   TGeoMedium *sm8 = gGeoManager->GetMedium("TPC_Epoxyfm");
526   TGeoVolume *cd1v = new TGeoVolume("TPC_CDR1",cd1,sm2); //tedlar
527   TGeoVolume *cd2v = new TGeoVolume("TPC_CDR2",cd2,sm6);// prepreg1
528   TGeoVolume *cd3v = new TGeoVolume("TPC_CDR3",cd3,sm8); //epoxy film
529   TGeoVolume *cd4v = new TGeoVolume("TPC_CDR4",cd4,sm4); //nomex
530   TGeoVolume *tvep4 = new TGeoVolume("TPC_IFEPOX4",tepox4,sm1);
531
532   //
533   // seals for central drum 2 copies
534   //
535   TGeoTube *cs = new TGeoTube(56.9,61.2,0.1);
536   TGeoMedium *sm7 = gGeoManager->GetMedium("TPC_Mylar");
537   TGeoVolume *csv = new TGeoVolume("TPC_CDRS",cs,sm7);
538   v1->AddNode(csv,1,new TGeoTranslation(0.,0.,-71.2));
539   v1->AddNode(csv,2,new TGeoTranslation(0.,0.,71.2));
540   //
541   // seal collars 
542   TGeoPcon *se = new TGeoPcon(0.,360.,6);
543   se->DefineSection(0,-72.8,59.7,61.2);
544   se->DefineSection(1,-72.3,59.7,61.2);
545   //
546   se->DefineSection(2,-72.3,58.85,61.2);
547   se->DefineSection(3,-71.6,58.85,61.2); 
548   //
549   se->DefineSection(4,-71.6,59.7,61.2);
550   se->DefineSection(5,-71.3,59.7,61.2);  
551   //
552   TGeoVolume *sev = new TGeoVolume("TPC_CDCE",se,m3);
553   //
554   TGeoTube *si = new TGeoTube(56.9,58.8,1.); 
555   TGeoVolume *siv = new TGeoVolume("TPC_CDCI",si,m3);
556   //
557   // define reflection matrix 
558   //
559   TGeoRotation *ref = new TGeoRotation("ref",90.,0.,90.,90.,180.,0.);
560   //
561   cd1v->AddNode(cd2v,1); cd2v->AddNode(cd3v,1); cd3v->AddNode(cd4v,1); //sandwich
562   // first segment  
563   cflv->AddNode(cd1v,1); cflv->AddNode(tvep4,1);
564   // second segment
565   segrot = new TGeoRotation();
566   segrot->RotateZ(120.);
567   cflv->AddNode(cd1v,2,segrot); cflv->AddNode(tvep4,2,segrot);
568   // third segment
569   segrot = new TGeoRotation();
570   segrot->RotateZ(240.);
571   cflv->AddNode(cd1v,3,segrot); cflv->AddNode(tvep4,3,segrot);
572   //
573   v1->AddNode(siv,1,new TGeoTranslation(0.,0.,-69.9));
574   v1->AddNode(siv,2,new TGeoTranslation(0.,0.,69.9));
575   v1->AddNode(sev,1); v1->AddNode(sev,2,ref); v1->AddNode(cflv,1);
576   //
577   // central membrane - 2 rings and a mylar membrane - assembly
578   //
579   TGeoTube *ih = new TGeoTube(81.05,84.05,0.3);
580   TGeoTube *oh = new TGeoTube(250.,256.,0.5);
581   TGeoTube *mem = new TGeoTube(84.05,250.,0.00115);
582
583   //
584   TGeoMedium *m4 = gGeoManager->GetMedium("TPC_G10");
585   //
586   TGeoVolume *ihv = new TGeoVolume("TPC_IHVH",ih,m3);
587   TGeoVolume *ohv = new TGeoVolume("TPC_OHVH",oh,m3);
588   
589   TGeoVolume *memv = new TGeoVolume("TPC_HV",mem,sm7);
590   //
591   TGeoVolumeAssembly *cm = new TGeoVolumeAssembly("TPC_HVMEM");
592   cm->AddNode(ihv,1);
593   cm->AddNode(ohv,1);
594   cm->AddNode(memv,1);
595  
596   v9->AddNode(cm,1);
597   //
598   // end caps - they are make as an assembly of single segments
599   // containing both readout chambers
600   //
601   Double_t openingAngle = 10.*TMath::DegToRad();
602   Double_t thick=1.5; // rib
603   Double_t shift = thick/TMath::Sin(openingAngle);
604   //
605   Double_t lowEdge = 86.3; // hole in the wheel
606   Double_t upEdge = 240.4; // hole in the wheel
607   //
608   new TGeoTubeSeg("sec",74.5,264.4,3.,0.,20.);
609   //
610   TGeoPgon *hole = new TGeoPgon("hole",0.,20.,1,4);
611   //
612   hole->DefineSection(0,-3.5,lowEdge-shift,upEdge-shift);
613   hole->DefineSection(1,-1.5,lowEdge-shift,upEdge-shift);
614   //
615   hole->DefineSection(2,-1.5,lowEdge-shift,upEdge+3.-shift);
616   hole->DefineSection(3,3.5,lowEdge-shift,upEdge+3.-shift);
617   //
618   Double_t ys = shift*TMath::Sin(openingAngle); 
619   Double_t xs = shift*TMath::Cos(openingAngle);
620   TGeoTranslation *tr = new TGeoTranslation("tr",xs,ys,0.);  
621   tr->RegisterYourself();
622   TGeoCompositeShape *chamber = new TGeoCompositeShape("sec-hole:tr");
623   TGeoVolume *sv = new TGeoVolume("TPC_WSEG",chamber,m3);
624   TGeoPgon *bar = new TGeoPgon("bar",0.,20.,1,2);
625   bar->DefineSection(0,-3.,131.5-shift,136.5-shift);
626   bar->DefineSection(1,1.5,131.5-shift,136.5-shift);
627   TGeoVolume *barv = new TGeoVolume("TPC_WBAR",bar,m3);
628   TGeoVolumeAssembly *ch = new TGeoVolumeAssembly("TPC_WCH");//empty segment
629   //
630   ch->AddNode(sv,1); ch->AddNode(barv,1,tr);
631   //
632   // readout chambers
633   //
634   // IROC first
635   //
636    TGeoTrd1 *ibody = new TGeoTrd1(13.8742,21.3328,4.29,21.15);
637    TGeoVolume *ibdv = new TGeoVolume("TPC_IROCB",ibody,m3);
638   // empty space
639    TGeoTrd1 *emp = new TGeoTrd1(12.3742,19.8328,3.99,19.65);
640    TGeoVolume *empv = new TGeoVolume("TPC_IROCE",emp,m1);
641    ibdv->AddNode(empv,1,new TGeoTranslation(0.,-0.3,0.));
642    //bars
643    Double_t tga = (19.8328-12.3742)/39.3;
644    Double_t xmin,xmax;
645    xmin = 9.55*tga+12.3742;
646    xmax = 9.95*tga+12.3742;
647    TGeoTrd1 *ib1 = new TGeoTrd1(xmin,xmax,3.29,0.2);
648    TGeoVolume *ib1v = new TGeoVolume("TPC_IRB1",ib1,m3);
649    empv->AddNode(ib1v,1,new TGeoTranslation("tt1",0.,0.7,-9.9));
650    xmin=19.4*tga+12.3742;
651    xmax=19.9*tga+12.3742;
652    TGeoTrd1 *ib2 = new TGeoTrd1(xmin,xmax,3.29,0.25);
653    TGeoVolume *ib2v = new TGeoVolume("TPC_TRB2",ib2,m3);
654    empv->AddNode(ib2v,1,new TGeoTranslation(0.,0.7,0.));
655    xmin=29.35*tga+12.3742;
656    xmax=29.75*tga+12.3742;
657    TGeoTrd1 *ib3 = new TGeoTrd1(xmin,xmax,3.29,0.2); 
658    TGeoVolume *ib3v = new TGeoVolume("TPC_IRB3",ib3,m3);    
659    empv->AddNode(ib3v,1,new TGeoTranslation(0.,0.7,9.9));
660    //
661    // holes for connectors
662    //
663    TGeoBBox *conn = new TGeoBBox(0.4,0.3,4.675); // identical for iroc and oroc
664    TGeoVolume *connv = new TGeoVolume("TPC_RCCON",conn,m1);
665    TString fileName(gSystem->Getenv("ALICE_ROOT"));
666    fileName += "/TPC/conn_iroc.dat";
667    ifstream in;
668    in.open(fileName.Data(), ios_base::in); // asci file
669    TGeoRotation *rrr[86];
670    for(Int_t i =0;i<86;i++){
671       Double_t y = 3.99;
672       Double_t x,z,ang;
673       in>>x>>z>>ang;
674       z-=26.5;
675       rrr[i]= new TGeoRotation();
676       rrr[i]->RotateY(ang);
677       ibdv->AddNode(connv,i+1,new TGeoCombiTrans(x,y,z,rrr[i]));
678    }
679    in.close();
680    // "cap"
681    new TGeoTrd1("icap",14.5974,23.3521,1.19,24.825);
682    // "hole"
683    new TGeoTrd1("ihole",13.8742,21.3328,1.2,21.15);
684    TGeoTranslation *tr1 = new TGeoTranslation("tr1",0.,0.,1.725);  
685    tr1->RegisterYourself();
686    TGeoCompositeShape *ic = new TGeoCompositeShape("icap-ihole:tr1");
687    TGeoVolume *icv = new TGeoVolume("TPC_IRCAP",ic,m3);
688    //
689    // pad plane and wire fixations
690    //
691    TGeoTrd1 *pp = new TGeoTrd1(14.5974,23.3521,0.3,24.825); //pad+iso
692    TGeoVolume *ppv = new TGeoVolume("TPC_IRPP",pp,m4);
693    TGeoPara *f1 = new TGeoPara(.6,.5,24.825,0.,-10.,0.);
694    TGeoVolume *f1v = new TGeoVolume("TPC_IRF1",f1,m4);
695    TGeoPara *f2 = new TGeoPara(.6,.5,24.825,0.,10.,0.);
696    TGeoVolume *f2v = new TGeoVolume("TPC_IRF2",f2,m4);
697    //
698    TGeoVolumeAssembly *iroc = new TGeoVolumeAssembly("TPC_IROC");
699    //
700    iroc->AddNode(ibdv,1);
701    iroc->AddNode(icv,1,new TGeoTranslation(0.,3.1,-1.725));
702    iroc->AddNode(ppv,1,new TGeoTranslation(0.,4.59,-1.725));
703    tga =(23.3521-14.5974)/49.65; 
704    Double_t xx = 24.825*tga+14.5974-0.6;
705    iroc->AddNode(f1v,1,new TGeoTranslation(-xx,5.39,-1.725));
706    iroc->AddNode(f2v,1,new TGeoTranslation(xx,5.39,-1.725));
707    //
708    // OROC
709    //
710    TGeoTrd1 *obody = new TGeoTrd1(22.2938,40.5084,4.19,51.65);
711    TGeoVolume *obdv = new TGeoVolume("TPC_OROCB",obody,m3);
712    TGeoTrd1 *oemp = new TGeoTrd1(20.2938,38.5084,3.89,49.65);
713    TGeoVolume *oempv = new TGeoVolume("TPC_OROCE",oemp,m1);
714    obdv->AddNode(oempv,1,new TGeoTranslation(0.,-0.3,0.));
715    //horizontal bars
716    tga=(38.5084-20.2938)/99.3;
717    xmin=tga*10.2+20.2938;
718    xmax=tga*10.6+20.2938;
719    TGeoTrd1 *ob1 = new TGeoTrd1(xmin,xmax,2.915,0.2);
720    TGeoVolume *ob1v = new TGeoVolume("TPC_ORB1",ob1,m3);
721    //
722    xmin=22.55*tga+20.2938;
723    xmax=24.15*tga+20.2938;
724    TGeoTrd1 *ob2 = new TGeoTrd1(xmin,xmax,2.915,0.8);
725    TGeoVolume *ob2v = new TGeoVolume("TPC_ORB2",ob2,m3);
726    //
727    xmin=36.1*tga+20.2938;
728    xmax=36.5*tga+20.2938;
729    TGeoTrd1 *ob3 = new TGeoTrd1(xmin,xmax,2.915,0.2);
730    TGeoVolume *ob3v = new TGeoVolume("TPC_ORB3",ob3,m3);
731    //
732    xmin=49.0*tga+20.2938;
733    xmax=50.6*tga+20.2938;   
734    TGeoTrd1 *ob4 = new TGeoTrd1(xmin,xmax,2.915,0.8);
735    TGeoVolume *ob4v = new TGeoVolume("TPC_ORB4",ob4,m3);
736    //
737    xmin=63.6*tga+20.2938;
738    xmax=64.0*tga+20.2938;
739    TGeoTrd1 *ob5 = new TGeoTrd1(xmin,xmax,2.915,0.2);
740    TGeoVolume *ob5v = new TGeoVolume("TPC_ORB5",ob5,m3);
741    //
742    xmin=75.5*tga+20.2938;
743    xmax=77.15*tga+20.2938;
744    TGeoTrd1 *ob6 = new TGeoTrd1(xmin,xmax,2.915,0.8);
745    TGeoVolume *ob6v = new TGeoVolume("TPC_ORB6",ob6,m3);
746    //
747    xmin=88.7*tga+20.2938;
748    xmax=89.1*tga+20.2938;
749    TGeoTrd1 *ob7 = new TGeoTrd1(xmin,xmax,2.915,0.2);
750    TGeoVolume *ob7v = new TGeoVolume("TPC_ORB7",ob7,m3);
751    //
752    oempv->AddNode(ob1v,1,new TGeoTranslation(0.,0.975,-39.25));
753    oempv->AddNode(ob2v,1,new TGeoTranslation(0.,0.975,-26.3));
754    oempv->AddNode(ob3v,1,new TGeoTranslation(0.,0.975,-13.35));
755    oempv->AddNode(ob4v,1,new TGeoTranslation(0.,0.975,0.15));
756    oempv->AddNode(ob5v,1,new TGeoTranslation(0.,0.975,14.15));
757    oempv->AddNode(ob6v,1,new TGeoTranslation(0.,0.975,26.7));
758    oempv->AddNode(ob7v,1,new TGeoTranslation(0.,0.975,39.25));
759    // vertical bars
760    TGeoBBox *ob8 = new TGeoBBox(0.8,2.915,5.1); 
761    TGeoBBox *ob9 = new TGeoBBox(0.8,2.915,5.975);
762    TGeoBBox *ob10 = new TGeoBBox(0.8,2.915,5.775);
763    TGeoBBox *ob11 = new TGeoBBox(0.8,2.915,6.25);
764    TGeoBBox *ob12 = new TGeoBBox(0.8,2.915,6.5);
765    //
766    TGeoVolume *ob8v = new TGeoVolume("TPC_ORB8",ob8,m3);
767    TGeoVolume *ob9v = new TGeoVolume("TPC_ORB9",ob9,m3);
768    TGeoVolume *ob10v = new TGeoVolume("TPC_ORB10",ob10,m3);
769    TGeoVolume *ob11v = new TGeoVolume("TPC_ORB11",ob11,m3);
770    TGeoVolume *ob12v = new TGeoVolume("TPC_ORB12",ob12,m3);
771    //
772    oempv->AddNode(ob8v,1,new TGeoTranslation(0.,0.975,-44.55));
773    oempv->AddNode(ob8v,2,new TGeoTranslation(0.,0.975,44.55));
774    oempv->AddNode(ob9v,1,new TGeoTranslation(0.,0.975,-33.075));
775    oempv->AddNode(ob9v,2,new TGeoTranslation(0.,0.975,-19.525));
776    oempv->AddNode(ob10v,1,new TGeoTranslation(0.,0.975,20.125));
777    oempv->AddNode(ob10v,2,new TGeoTranslation(0.,0.975,33.275));
778    oempv->AddNode(ob11v,1,new TGeoTranslation(0.,0.975,-6.9));
779    oempv->AddNode(ob12v,1,new TGeoTranslation(0.,0.975,7.45));
780    //
781    // holes for connectors
782    //
783    fileName = gSystem->Getenv("ALICE_ROOT");
784    fileName += "/TPC/conn_oroc.dat";
785    in.open(fileName.Data(), ios_base::in); // asci file
786    TGeoRotation *rr[78];
787    for(Int_t i =0;i<78;i++){
788       Double_t y =3.89;
789       Double_t x,z,ang;
790       Double_t x1,z1,x2,z2;
791       in>>x>>z>>ang;        
792       Double_t xr = 4.7*TMath::Sin(ang*TMath::DegToRad());
793       Double_t zr = 4.7*TMath::Cos(ang*TMath::DegToRad());
794       //
795       x1=xr+x; x2=-xr+x; z1=zr+z; z2 = -zr+z;      
796       //
797       rr[i]= new TGeoRotation();
798       rr[i]->RotateY(ang); 
799       z1-=54.95;
800       z2-=54.95;
801       //
802       obdv->AddNode(connv,i+1,new TGeoCombiTrans(x1,y,z1,rr[i]));
803       obdv->AddNode(connv,i+79,new TGeoCombiTrans(x2,y,z2,rr[i]));
804    }
805    in.close();
806    // cap
807    new TGeoTrd1("ocap",23.3874,43.5239,1.09,57.1);
808    new TGeoTrd1("ohole",22.2938,40.5084,1.09,51.65);
809    TGeoTranslation *tr5 = new TGeoTranslation("tr5",0.,0.,-2.15);
810    tr5->RegisterYourself();
811    TGeoCompositeShape *oc = new TGeoCompositeShape("ocap-ohole:tr5");
812    TGeoVolume *ocv = new TGeoVolume("TPC_ORCAP",oc,m3);
813    //
814    // pad plane and wire fixations
815    //
816    TGeoTrd1 *opp = new TGeoTrd1(23.3874,43.5239,0.3,57.1);
817    TGeoVolume *oppv = new TGeoVolume("TPC_ORPP",opp,m4);
818    //
819    tga=(43.5239-23.3874)/114.2;
820    TGeoPara *f3 = new TGeoPara(.7,.6,57.1,0.,-10.,0.);
821    TGeoPara *f4 = new TGeoPara(.7,.6,57.1,0.,10.,0.);  
822    xx = 57.1*tga+23.3874-0.7;
823    TGeoVolume *f3v = new TGeoVolume("TPC_ORF1",f3,m4);
824    TGeoVolume *f4v = new TGeoVolume("TPC_ORF2",f4,m4);
825    //
826    TGeoVolumeAssembly *oroc = new TGeoVolumeAssembly("TPC_OROC");
827    //
828    oroc->AddNode(obdv,1);
829    oroc->AddNode(ocv,1,new TGeoTranslation(0.,3.1,2.15));
830    oroc->AddNode(oppv,1,new TGeoTranslation(0.,4.49,2.15));
831    oroc->AddNode(f3v,1,new TGeoTranslation(-xx,5.39,2.15));
832    oroc->AddNode(f4v,1,new TGeoTranslation(xx,5.39,2.15));
833    // 
834    // now iroc and oroc are placed into a sector...
835    //
836    TGeoVolumeAssembly *secta = new TGeoVolumeAssembly("TPC_SECT"); // a-side
837    TGeoVolumeAssembly *sectc = new TGeoVolumeAssembly("TPC_SECT"); // c-side
838    TGeoRotation rot1("rot1",90.,90.,0.);
839    TGeoRotation rot2("rot2");
840    rot2.RotateY(10.);
841    TGeoRotation *rot = new TGeoRotation("rot");
842    *rot=rot1*rot2;
843    //
844    Double_t x0,y0;
845    x0=110.2*TMath::Cos(openingAngle);
846    y0=110.2*TMath::Sin(openingAngle);
847    TGeoCombiTrans *combi1a = new TGeoCombiTrans("combi1",x0,y0,1.09+0.195,rot); //a-side 
848    TGeoCombiTrans *combi1c = new TGeoCombiTrans("combi1",x0,y0,1.09+0.222,rot); //c-side
849    x0=188.45*TMath::Cos(openingAngle);
850    y0=188.45*TMath::Sin(openingAngle);
851    TGeoCombiTrans *combi2a = new TGeoCombiTrans("combi2",x0,y0,0.99+0.195,rot); //a-side
852    TGeoCombiTrans *combi2c = new TGeoCombiTrans("combi2",x0,y0,0.99+0.222,rot); //c-side
853    //
854    //
855    // A-side
856    //
857    secta->AddNode(ch,1);
858    secta->AddNode(iroc,1,combi1a);
859    secta->AddNode(oroc,1,combi2a);
860    //
861    // C-side
862    //
863    sectc->AddNode(ch,1);
864    sectc->AddNode(iroc,1,combi1c);
865    sectc->AddNode(oroc,1,combi2c);
866    //
867    // now I try to make  wheels...
868    //
869    TGeoVolumeAssembly *wheela = new TGeoVolumeAssembly("TPC_ENDCAP");
870    TGeoVolumeAssembly *wheelc = new TGeoVolumeAssembly("TPC_ENDCAP");
871    //
872    TGeoRotation *rwh[18]; 
873    for(Int_t i =0;i<18;i++){
874      Double_t phi = (20.*i);
875      rwh[i]=new TGeoRotation();
876      rwh[i]->RotateZ(phi);
877      wheela->AddNode(secta,i+1,rwh[i]);
878      wheelc->AddNode(sectc,i+1,rwh[i]); 
879     
880    }
881    // wheels in the drift volume!   
882
883    TGeoCombiTrans *combi3 = new TGeoCombiTrans("combi3",0.,0.,256.6,ref);
884    v9->AddNode(wheela,1,combi3);
885    v9->AddNode(wheelc,2,new TGeoTranslation(0.,0.,-256.6));
886    //_____________________________________________________________
887    // service support wheel
888    //_____________________________________________________________
889   TGeoPgon *sw = new TGeoPgon(0.,20.,1,2);
890   sw->DefineSection(0,-4.,80.5,251.75);
891   sw->DefineSection(1,4.,80.5,251.75); 
892   TGeoVolume *swv = new TGeoVolume("TPC_SWSEG",sw,m3); //Al
893   //
894   thick=1.;
895   shift = thick/TMath::Sin(openingAngle);
896   TGeoPgon *sh = new TGeoPgon(0.,20.,1,2);
897   sh->DefineSection(0,-4.,81.5-shift,250.75-shift);
898   sh->DefineSection(1,4.,81.5-shift,250.75-shift);
899   TGeoVolume *shv = new TGeoVolume("TPC_SWS1",sh,m1); //Air
900   //
901   TGeoMedium *m9 =  gGeoManager->GetMedium("TPC_Si"); 
902   TGeoPgon *el = new TGeoPgon(0.,20.,1,2);
903   el->DefineSection(0,-1.872,81.5-shift,250.75-shift);
904   el->DefineSection(1,1.872,81.5-shift,250.75-shift);
905   TGeoVolume *elv = new TGeoVolume("TPC_ELEC",el,m9); //Si 
906   //
907   shv->AddNode(elv,1);
908   //
909   //
910   ys = shift*TMath::Sin(openingAngle);
911   xs = shift*TMath::Cos(openingAngle);
912   swv->AddNode(shv,1,new TGeoTranslation(xs,ys,0.));
913   // cover
914   TGeoPgon *co = new TGeoPgon(0.,20.,1,2);
915   co->DefineSection(0,-0.5,77.,255.25);
916   co->DefineSection(1,0.5,77.,255.25);
917   TGeoVolume *cov = new TGeoVolume("TPC_SWC1",co,m3);//Al
918   // hole in a cover
919   TGeoPgon *coh = new TGeoPgon(0.,20.,1,2);
920   shift=4./TMath::Sin(openingAngle);
921   coh->DefineSection(0,-0.5,85.-shift,247.25-shift);
922   coh->DefineSection(1,0.5,85.-shift,247.25-shift);  
923   //
924   TGeoVolume *cohv = new TGeoVolume("TPC_SWC2",coh,m1);
925   //
926   ys = shift*TMath::Sin(openingAngle);
927   xs = shift*TMath::Cos(openingAngle);  
928   cov->AddNode(cohv,1,new TGeoTranslation(xs,ys,0.));
929   //
930   // Sector as an Assembly
931   //
932   TGeoVolumeAssembly *swhs = new TGeoVolumeAssembly("TPC_SSWSEC");
933   swhs->AddNode(swv,1);
934   swhs->AddNode(cov,1,new TGeoTranslation(0.,0.,-4.5));
935   swhs->AddNode(cov,2,new TGeoTranslation(0.,0.,4.5));
936   //
937   // SSW as an Assembly of sectors
938   //
939   TGeoRotation *rsw[18];
940   TGeoVolumeAssembly *swheel = new TGeoVolumeAssembly("TPC_SSWHEEL");
941    for(Int_t i =0;i<18;i++){
942      Double_t phi = (20.*i);
943      rsw[i] = new TGeoRotation();
944      rsw[i]->RotateZ(phi);
945      swheel->AddNode(swhs,i+1,rsw[i]);   
946    }
947    v1->AddNode(swheel,1,new TGeoTranslation(0.,0.,-284.6));
948    v1->AddNode(swheel,2,new TGeoTranslation(0.,0.,284.6));
949
950    // sensitive strips - strip "0" is always set
951    // conditional
952    Int_t totrows;
953    totrows = fTPCParam->GetNRowLow() + fTPCParam->GetNRowUp();
954    Double_t *upar;
955    upar=NULL;
956    gGeoManager->Volume("TPC_Strip","PGON",m5->GetId(),upar);
957    upar=new Double_t [10];
958    upar[0]=0.;
959    upar[1]=360.;
960    upar[2]=18.;
961    upar[3]=2.;
962    //
963    upar[4]=-124.8;
964    upar[7]=124.8;
965
966    Double_t rlow=fTPCParam->GetPadRowRadiiLow(0);
967
968    upar[5]=rlow;
969    upar[6]=rlow+.01;
970    upar[8]=upar[5];
971    upar[9]=upar[6];
972    //
973    gGeoManager->Node("TPC_Strip",1,"TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
974    gGeoManager->Node("TPC_Strip",totrows+1,
975                      "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);
976    //
977    // now, strips optionally
978    //
979    if(fSens){
980      //lower sectors
981      for(Int_t i=2;i<fTPCParam->GetNRowLow()+1;i++){
982        rlow=fTPCParam->GetPadRowRadiiLow(i-1);
983        upar[5]=rlow;
984        upar[6]=rlow+.01;
985        upar[8]=upar[5];
986        upar[9]=upar[6];
987        gGeoManager->Node("TPC_Strip",i,
988                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10);
989        gGeoManager->Node("TPC_Strip",totrows+i,
990                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10);       
991      }
992      //upper sectors
993      for(Int_t i=1;i<fTPCParam->GetNRowUp()+1;i++){
994        rlow=fTPCParam->GetPadRowRadiiUp(i-1); 
995        upar[5]=rlow;
996        upar[6]=rlow+.01;
997        upar[8]=upar[5];
998        upar[9]=upar[6];
999        gGeoManager->Node("TPC_Strip",i+fTPCParam->GetNRowLow(),
1000                          "TPC_Drift",0.,0.,124.82,0,kTRUE,upar,10); 
1001        gGeoManager->Node("TPC_Strip",totrows+i+fTPCParam->GetNRowLow(),
1002                          "TPC_Drift",0.,0.,-124.82,0,kTRUE,upar,10); 
1003      }
1004    }//strips
1005   //----------------------------------------------------------
1006   // TPC Support Rods - MAKROLON
1007   //----------------------------------------------------------
1008   TGeoMedium *m6=gGeoManager->GetMedium("TPC_Makrolon");
1009   TGeoMedium *m7=gGeoManager->GetMedium("TPC_Cu");
1010   TGeoMedium *m10 =  gGeoManager->GetMedium("TPC_Alumina");
1011   TGeoMedium *m11 =  gGeoManager->GetMedium("TPC_Peek");
1012   TGeoMedium *m12 =  gGeoManager->GetMedium("TPC_Water");
1013   TGeoMedium *m13 = gGeoManager->GetMedium("TPC_Brass");
1014   // 
1015   // tpc rod is an assembly of 10 long parts and 2 short parts
1016   // connected with alu rings and plagged on both sides.
1017   //
1018   //
1019 // tpc rod long
1020 //
1021   TGeoPcon *rod = new TGeoPcon("rod",0.,360.,6);
1022  rod->DefineSection(0,-10.43,1.92,2.08);
1023  rod->DefineSection(1,-9.75,1.92,2.08);
1024
1025  rod->DefineSection(2,-9.75,1.8,2.2);
1026  rod->DefineSection(3,9.75,1.8,2.2);
1027
1028  rod->DefineSection(4,9.75,1.92,2.08);
1029  rod->DefineSection(5,10.43,1.92,2.08);
1030  //
1031  TGeoVolume *mrodl = new TGeoVolume("TPC_mrodl",rod,m6);
1032  //
1033  // tpc rod short 
1034  //
1035  TGeoPcon *rod1 = new TGeoPcon("rod1",0.,360.,6);
1036  rod1->DefineSection(0,-8.93,1.92,2.08);
1037  rod1->DefineSection(1,-8.25,1.92,2.08);
1038
1039  rod1->DefineSection(2,-8.25,1.8,2.2);
1040  rod1->DefineSection(3,8.25,1.8,2.2);
1041
1042  rod1->DefineSection(4,8.25,1.92,2.08);
1043  rod1->DefineSection(5,8.93,1.92,2.08);
1044  //
1045  TGeoVolume *mrods = new TGeoVolume("TPC_mrods",rod1,m6);
1046  //
1047  // below is for the resistor rod
1048  //
1049  // hole for the brass connectors
1050  //
1051
1052  new TGeoTube("hhole",0.,0.3,0.3);
1053  //
1054  //transformations for holes - initialy they
1055  // are placed at x=0 and negative y
1056  //
1057   TGeoRotation *rhole = new TGeoRotation();
1058   rhole->RotateX(90.);
1059   TGeoCombiTrans *transf[13];
1060   Char_t name[30];
1061   for(Int_t i=0;i<13;i++){
1062     sprintf(name,"transf%d",i);
1063     transf[i]= new TGeoCombiTrans(name,0.,-2.,-9.+i*1.5,rhole);
1064     transf[i]->RegisterYourself();
1065   }
1066   // union expression for holes
1067   TString operl("hhole:transf0");
1068   for (Int_t i=1;i<13;i++){
1069     sprintf(name,"+hhole:transf%d",i);
1070     operl.Append(name);   
1071   }
1072   //
1073  TString opers("hhole:transf1");
1074   for (Int_t i=2;i<12;i++){
1075     sprintf(name,"+hhole:transf%d",i);
1076     opers.Append(name);   
1077   }
1078   //union of holes
1079   new TGeoCompositeShape("hlv",operl.Data());
1080   new TGeoCompositeShape("hsv",opers.Data());
1081   //
1082   TGeoCompositeShape *rodl = new TGeoCompositeShape("rodl","rod-hlv");
1083   TGeoCompositeShape *rods = new TGeoCompositeShape("rods","rod1-hsv");
1084  //rods - volumes - makrolon rods with holes
1085   TGeoVolume *rodlv = new TGeoVolume("TPC_rodl",rodl,m6);
1086   TGeoVolume *rodsv = new TGeoVolume("TPC_rods",rods,m6);
1087   //brass connectors
1088  //connectors
1089   TGeoTube *bcon = new TGeoTube(0.,0.3,0.3);//connectors
1090   TGeoVolume *bconv = new TGeoVolume("TPC_bcon",bcon,m13);
1091  //
1092  // hooks holding strips
1093  //
1094  new TGeoBBox("hk1",0.625,0.015,0.75);
1095  new TGeoBBox("hk2",0.625,0.015,0.15);
1096  TGeoTranslation *tr21 = new TGeoTranslation("tr21",0.,-0.03,-0.6);
1097  TGeoTranslation *tr12 = new TGeoTranslation("tr12",0.,-0.03,0.6);
1098  tr21->RegisterYourself();
1099  tr12->RegisterYourself();
1100  
1101  TGeoCompositeShape *hook = new TGeoCompositeShape("hook","hk1+hk2:tr21+hk2:tr12");
1102  TGeoVolume *hookv = new TGeoVolume("TPC_hook",hook,m13);
1103  //
1104  // assembly of the short rod with connectors and hooks
1105  //
1106  //
1107  // short rod
1108  //
1109   TGeoVolumeAssembly *spart = new TGeoVolumeAssembly("TPC_spart");
1110   //
1111   spart->AddNode( rodsv,1);
1112   for(Int_t i=1;i<12;i++){
1113   spart->AddNode(bconv,i,transf[i]);
1114   }
1115   for(Int_t i =0;i<11;i++){
1116     spart->AddNode(hookv,i+1,new TGeoTranslation(0.,-2.315,-7.5+i*1.5));
1117   } 
1118  //
1119  // long rod
1120  //
1121   TGeoVolumeAssembly *lpart = new TGeoVolumeAssembly("TPC_lpart");
1122   //
1123   lpart->AddNode( rodlv,1);
1124   for(Int_t i=0;i<13;i++){
1125   lpart->AddNode(bconv,i+12,transf[i]);
1126   }
1127   for(Int_t i =0;i<13;i++){
1128     lpart->AddNode(hookv,i+12,new TGeoTranslation(0.,-2.315,-9.+i*1.5));
1129   }   
1130   //
1131   // alu ring
1132   //
1133   new TGeoTube("ring1",2.1075,2.235,0.53);
1134   new TGeoTube("ring2",1.7925,1.89,0.43);
1135   new TGeoTube("ring3",1.89,2.1075,0.05);
1136   TGeoCompositeShape *ring = new TGeoCompositeShape("ring","ring1+ring2+ring3");
1137   TGeoVolume *ringv = new TGeoVolume("TPC_ring",ring,m3);
1138   //
1139   // rod assembly
1140   //
1141   TGeoVolumeAssembly *tpcrrod = new TGeoVolumeAssembly("TPC_rrod");//rrod
1142   TGeoVolumeAssembly *tpcmrod = new TGeoVolumeAssembly("TPC_mrod");//makrolon rod  
1143   //long pieces
1144   for(Int_t i=0;i<11;i++){
1145     tpcrrod->AddNode(ringv,i+1,new TGeoTranslation(0.,0.,-105.+i*21));
1146     tpcmrod->AddNode(ringv,i+12,new TGeoTranslation(0.,0.,-105.+i*21));
1147   }
1148   for(Int_t i=0;i<10;i++){
1149     tpcrrod->AddNode(lpart,i+1,new TGeoTranslation(0.,0.,-94.5+i*21));
1150     tpcmrod->AddNode(mrodl,i+1,new TGeoTranslation(0.,0.,-94.5+i*21));      
1151   }
1152   //
1153   // short pieces
1154   //
1155   tpcrrod->AddNode(spart,1,new TGeoTranslation(0.,0.,-114.));
1156   tpcrrod->AddNode(spart,2,new TGeoTranslation(0.,0.,114.)); 
1157   tpcrrod->AddNode(ringv,23,new TGeoTranslation(0.,0.,-123.));
1158   tpcrrod->AddNode(ringv,24,new TGeoTranslation(0.,0.,123.));
1159   //
1160   tpcmrod->AddNode(mrods,1,new TGeoTranslation(0.,0.,-114.));
1161   tpcmrod->AddNode(mrods,2,new TGeoTranslation(0.,0.,114.)); 
1162   tpcmrod->AddNode(ringv,25,new TGeoTranslation(0.,0.,-123.));
1163   tpcmrod->AddNode(ringv,26,new TGeoTranslation(0.,0.,123.));
1164  //
1165   // left plaque
1166   //
1167   TGeoPcon *lp = new TGeoPcon(0.,360.,4);
1168   //
1169   lp->DefineSection(0,-125.8,1.92,2.235);
1170   lp->DefineSection(1,-124.8,1.92,2.235);
1171   //
1172   lp->DefineSection(2,-124.8,1.92,2.08);
1173   lp->DefineSection(3,-123.1,1.92,2.08);
1174   //
1175   TGeoVolume *lpv1 = new TGeoVolume("TPC_lpv1",lp,m6);
1176   TGeoVolume *lpv2 = new TGeoVolume("TPC_lpv2",lp,m6);
1177   // left ring
1178   TGeoTube *lr = new TGeoTube(2.1075,2.235,0.5);
1179   TGeoVolume *lrv = new TGeoVolume("TPC_lrv",lr,m3);
1180   //
1181   lpv2->AddNode(lrv,1,new TGeoTranslation(0.,0.,-125.3));
1182   //
1183   tpcrrod->AddNode(lpv2,1); 
1184   tpcmrod->AddNode(lpv1,1);
1185   //
1186   //  right plaque
1187   //
1188   TGeoTube *rp = new TGeoTube(1.92,2.08,2.025);
1189   TGeoVolume *rpv = new TGeoVolume("TPC_rpv",rp,m6);
1190   tpcrrod->AddNode(rpv,1, new TGeoTranslation(0.,0.,125.125)); 
1191   tpcmrod->AddNode(rpv,2,new TGeoTranslation(0.,0.,125.125));
1192   //
1193   //
1194   //HV rods - makrolon + 0.58cm (diameter) Cu
1195   TGeoTube *hvr = new TGeoTube(0.,1.465,126.5);
1196   TGeoTube *hvc = new TGeoTube(0.,0.29,126.5);
1197   //
1198   TGeoVolume *hvrv = new TGeoVolume("TPC_HV_Rod",hvr,m6);
1199   TGeoVolume *hvcv = new TGeoVolume("TPC_HV_Cable",hvc,m7);
1200   hvrv->AddNode(hvcv,1);
1201   //
1202   //resistor rod
1203   //
1204   TGeoTube *cr = new TGeoTube(0.,0.45,126.2);   
1205   TGeoTube *cw = new TGeoTube(0.,0.15,126.2);  
1206   TGeoVolume *crv = new TGeoVolume("TPC_CR",cr,m10);
1207   TGeoVolume *cwv = new TGeoVolume("TPC_W",cw,m12);   
1208   //
1209   // ceramic rod with water
1210   //
1211   crv->AddNode(cwv,1);
1212   //
1213   //peek rod
1214   //
1215   TGeoTube *pr =new TGeoTube(0.2,0.35,126.2);  
1216   TGeoVolume *prv = new TGeoVolume("TPC_PR",pr,m11); 
1217   //
1218   // copper plates with connectors
1219   //
1220   new TGeoTube("tub",0.,1.7,0.025);
1221   //
1222   // half space - points on the plane and a normal vector
1223   //
1224   Double_t n[3],p[3];
1225   Double_t slope = TMath::Tan(22.*TMath::DegToRad());
1226   Double_t intp = 1.245;
1227   //
1228   Double_t b = slope*slope+1.;
1229   p[0]=intp*slope/b;
1230   p[1]=-intp/b;
1231   p[2]=0.;
1232   //
1233   n[0]=-p[0];
1234   n[1]=-p[1];
1235   n[2]=0.;
1236   Double_t norm;
1237   norm=TMath::Sqrt(n[0]*n[0]+n[1]*n[1]);
1238   n[0] /= norm;
1239   n[1] /=norm;
1240   //
1241   new TGeoHalfSpace("sp1",p,n);
1242   //
1243   slope = -slope; 
1244   //
1245   p[0]=intp*slope/b;
1246   p[1]=-intp/b;
1247   //
1248   n[0]=-p[0];
1249   n[1]=-p[1];
1250   norm=TMath::Sqrt(n[0]*n[0]+n[1]*n[1]);
1251   n[0] /= norm;
1252   n[1] /=norm;
1253   //
1254   new TGeoHalfSpace("sp2",p,n);
1255   // holes for rods
1256  //holes
1257  new TGeoTube("h1",0.,0.5,0.025);
1258  new TGeoTube("h2",0.,0.35,0.025);
1259  //translations:
1260  TGeoTranslation *ttr11 = new TGeoTranslation("ttr11",-0.866,0.5,0.);
1261  TGeoTranslation *ttr22 = new TGeoTranslation("ttr22",0.866,0.5,0.);
1262  ttr11->RegisterYourself();
1263  ttr22->RegisterYourself();
1264  // elastic connector
1265  new TGeoBBox("elcon",0.72,0.005,0.3);
1266  TGeoRotation *crr1 = new TGeoRotation();
1267  crr1->RotateZ(-22.);
1268 TGeoCombiTrans *ctr1 = new TGeoCombiTrans("ctr1",-0.36011, -1.09951,-0.325,crr1);
1269 ctr1->RegisterYourself();
1270  TGeoCompositeShape *cs1 = new TGeoCompositeShape("cs1",
1271 "(((((tub-h1:ttr11)-h1:ttr22)-sp1)-sp2)-h2)+elcon:ctr1");
1272  //
1273  TGeoVolume *csvv = new TGeoVolume("TPC_RR_CU",cs1,m7);
1274  //
1275  // resistor rod assembly 2 ceramic rods, peak rod, Cu plates
1276  // and resistors
1277  //
1278  TGeoVolumeAssembly *rrod = new TGeoVolumeAssembly("TPC_RRIN");
1279  // rods
1280  rrod->AddNode(crv,1,ttr11);
1281  rrod->AddNode(crv,2,ttr22); 
1282  rrod->AddNode(prv,1);
1283  //Cu plates
1284  for(Int_t i=0;i<165;i++){
1285    rrod->AddNode(csvv,i+1,new TGeoTranslation(0.,0.,-122.675+i*1.5));
1286  }
1287  //resistors
1288  TGeoTube *res = new TGeoTube(0.,0.15,0.5);
1289  TGeoVolume *resv = new TGeoVolume("TPC_RES",res,m10);
1290  TGeoVolumeAssembly *ress = new TGeoVolumeAssembly("TPC_RES_CH");
1291  ress->AddNode(resv,1,new TGeoTranslation(0.2,0.,0.));
1292  ress->AddNode(resv,2,new TGeoTranslation(-0.2,0.,0.));
1293  //
1294  TGeoRotation *crr2 = new TGeoRotation();
1295  crr2->RotateY(30.);
1296  TGeoRotation *crr3 = new TGeoRotation();
1297  crr3->RotateY(-30.); 
1298  //
1299  for(Int_t i=0;i<164;i+=2){
1300    rrod->AddNode(ress,i+1, new TGeoCombiTrans(0.,1.2,-121.925+i*1.5,crr2));
1301    rrod->AddNode(ress,i+2, new TGeoCombiTrans(0.,1.2,-121.925+(i+1)*1.5,crr3));
1302  }
1303
1304  tpcrrod->AddNode(rrod,1,new TGeoCombiTrans(0.,0.,0.5,crr1));
1305  //
1306  // guard ring resistor chain
1307  //
1308
1309  TGeoTube *gres1 = new TGeoTube(0.,0.375,125.);// inside ifc
1310  //
1311  TGeoVolume *vgres1 = new TGeoVolume("TPC_GRES1",gres1,m10);
1312
1313  //
1314  Double_t xrc,yrc;
1315  //
1316  xrc=79.3*TMath::Cos(350.*TMath::DegToRad());
1317  yrc=79.3*TMath::Sin(350.*TMath::DegToRad());
1318  //
1319  v9->AddNode(vgres1,1,new TGeoTranslation(xrc,yrc,126.9));
1320  v9->AddNode(vgres1,2,new TGeoTranslation(xrc,yrc,-126.9));
1321  //
1322  xrc=79.3*TMath::Cos(190.*TMath::DegToRad());
1323  yrc=79.3*TMath::Sin(190.*TMath::DegToRad()); 
1324  //
1325  v9->AddNode(vgres1,3,new TGeoTranslation(xrc,yrc,126.9));
1326  v9->AddNode(vgres1,4,new TGeoTranslation(xrc,yrc,-126.9));
1327  //------------------------------------------------------------------
1328  TGeoRotation refl("refl",90.,0.,90.,90.,180.,0.);
1329  TGeoRotation rotrod("rotrod");
1330  //
1331  TGeoRotation *rotpos[2]; 
1332  //
1333  TGeoRotation *rotrod1[2]; 
1334  TGeoTubeSeg *irh = new TGeoTubeSeg(78.825,79.25,1.5,358.5,1.5);
1335  TGeoTubeSeg *orh = new TGeoTubeSeg(256.5,257.95,1.5,359.5,0.5);
1336  TGeoTubeSeg *ohh = new TGeoTubeSeg(256.5,257.95,1.5,9.5,10.5);
1337   TGeoVolume *irhv = new TGeoVolume("TPC_IRHH",irh,m4);
1338   TGeoVolume *orhv = new TGeoVolume("TPC_ORHH",orh,m4);
1339   TGeoVolume *ohhv = new TGeoVolume("TPC_OHVHH",ohh,m4);
1340   
1341  //v9 - drift gas
1342
1343   for(Int_t i=0;i<18;i++){
1344     Double_t angle,x,y;
1345     Double_t z,r; 
1346     angle=TMath::DegToRad()*20.*(Double_t)i;
1347     TGeoRotation *roth = new TGeoRotation(); //rotation for rod holders
1348     roth->RotateZ(angle);
1349     //inner rods
1350     r=81.5;
1351     x=r * TMath::Cos(angle);
1352     y=r * TMath::Sin(angle);
1353     z = 126.1;
1354     //
1355     v9->AddNode(irhv,i+1,roth);
1356     v9->AddNode(orhv,i+1,roth);
1357     v9->AddNode(ohhv,i+1,roth);
1358     //
1359     if(i==11){//resistor rod inner
1360        rotrod.RotateZ(-90.+angle);
1361        rotrod1[0]= new TGeoRotation();
1362        rotpos[0]= new TGeoRotation();
1363        //
1364        rotrod1[0]->RotateZ(-90.+angle);
1365        *rotpos[0] = refl*rotrod; //rotation+reflection
1366         v9->AddNode(tpcrrod,1,new TGeoCombiTrans(x,y, z, rotrod1[0])); //A
1367         v9->AddNode(tpcrrod,2,new TGeoCombiTrans(x,y,-z, rotpos[0])); //C      
1368     } 
1369     else { 
1370       v9->AddNode(tpcmrod,i+1,new TGeoTranslation(x,y,z));//shaft
1371       v9->AddNode(tpcmrod,i+19,new TGeoCombiTrans(x,y,-z,ref));//muon
1372     }
1373     // outer rods
1374     r=254.25;
1375     x=r * TMath::Cos(angle);
1376     y=r * TMath::Sin(angle);
1377     z=126.3;
1378     //
1379     if(i==3){//resistor rod outer
1380       rotrod.RotateZ(90.+angle);
1381       rotrod1[1]= new TGeoRotation();
1382       rotpos[1]= new TGeoRotation();
1383       rotrod1[1]->RotateZ(90.+angle);
1384       *rotpos[1] = refl*rotrod;//rotation+reflection
1385       v9->AddNode(tpcrrod,3,new TGeoCombiTrans(x,y, z, rotrod1[1])); //A 
1386       v9->AddNode(tpcrrod,4,new TGeoCombiTrans(x,y, -z, rotpos[1])); //C
1387     }
1388     else {
1389       v9->AddNode(tpcmrod,i+37,new TGeoTranslation(x,y,z));//shaft
1390       v9->AddNode(tpcmrod,i+55,new TGeoCombiTrans(x,y,-z,ref));//muon      
1391     }
1392     if(i==15){
1393       v9->AddNode(hvrv,1,new TGeoTranslation(x,y,z+0.7)); //hv->A-side only      
1394     }
1395   } //end of rods positioning
1396
1397   TGeoVolume *alice = gGeoManager->GetVolume("ALIC");
1398   alice->AddNode(v1,1);  
1399   
1400 } // end of function
1401  
1402 //_____________________________________________________________________________
1403 void AliTPCv2::AddAlignableVolumes() const
1404 {
1405   //
1406   // Create entries for alignable volumes associating the symbolic volume
1407   // name with the corresponding volume path. Needs to be syncronized with
1408   // eventual changes in the geometry.
1409   // 
1410   SetInnerChambersAlignable();
1411   SetOuterChambersAlignable();
1412 }
1413  
1414 //_____________________________________________________________________________
1415 void AliTPCv2::SetInnerChambersAlignable() const
1416 {
1417   //
1418   AliGeomManager::ELayerID idTPC1 = AliGeomManager::kTPC1;
1419   Int_t modUID, modnum = 0;
1420   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
1421   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
1422   TString vpappend = "/TPC_IROC_1";
1423   TString snstr1="TPC/EndcapA/Sector";
1424   TString snstr2="TPC/EndcapC/Sector";
1425   TString snappend="/InnerChamber";
1426   TString volpath, symname;
1427   
1428   for(Int_t cnt=1; cnt<=18; cnt++){
1429     modUID = AliGeomManager::LayerToVolUID(idTPC1,modnum++);
1430     volpath = vpstr1;
1431     volpath += cnt;
1432     volpath += vpappend;
1433     symname = snstr1;
1434     symname += cnt;
1435     symname += snappend;
1436     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1437       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1438     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1439     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1440     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,cnt-1);
1441     alignableEntry->SetMatrix(matTtoL);
1442   }
1443
1444   for(Int_t cnt=1; cnt<=18; cnt++){
1445     modUID = AliGeomManager::LayerToVolUID(idTPC1,modnum++);
1446     volpath = vpstr2;
1447     volpath += cnt;
1448     volpath += vpappend;
1449     symname = snstr2;
1450     symname += cnt;
1451     symname += snappend;
1452     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1453       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1454     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1455     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1456     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,18+cnt-1);
1457     alignableEntry->SetMatrix(matTtoL);
1458   }
1459 }
1460
1461 //_____________________________________________________________________________
1462 void AliTPCv2::SetOuterChambersAlignable() const
1463 {
1464   //
1465   AliGeomManager::ELayerID idTPC2 = AliGeomManager::kTPC2;
1466   Int_t modUID, modnum = 0;
1467   TString vpstr1 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_1/TPC_SECT_";
1468   TString vpstr2 = "ALIC_1/TPC_M_1/TPC_Drift_1/TPC_ENDCAP_2/TPC_SECT_";
1469   TString vpappend = "/TPC_OROC_1";
1470   TString snstr1="TPC/EndcapA/Sector";
1471   TString snstr2="TPC/EndcapC/Sector";
1472   TString snappend="/OuterChamber";
1473   TString volpath, symname;
1474   
1475   for(Int_t cnt=1; cnt<=18; cnt++){
1476     modUID = AliGeomManager::LayerToVolUID(idTPC2,modnum++);
1477     volpath = vpstr1;
1478     volpath += cnt;
1479     volpath += vpappend;
1480     symname = snstr1;
1481     symname += cnt;
1482     symname += snappend;
1483     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1484       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1485     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1486     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1487     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+cnt-1);
1488     alignableEntry->SetMatrix(matTtoL);
1489   }
1490
1491   for(Int_t cnt=1; cnt<=18; cnt++){
1492     modUID = AliGeomManager::LayerToVolUID(idTPC2,modnum++);
1493     volpath = vpstr2;
1494     volpath += cnt;
1495     volpath += vpappend;
1496     symname = snstr2;
1497     symname += cnt;
1498     symname += snappend;
1499     if(!gGeoManager->SetAlignableEntry(symname.Data(),volpath.Data(),modUID))
1500       AliFatal(Form("Alignable entry %s not created. Volume path %s not valid", symname.Data(),volpath.Data()));
1501     TGeoPNEntry *alignableEntry = gGeoManager->GetAlignableEntryByUID(modUID);
1502     TGeoHMatrix* globMatrix = alignableEntry->GetGlobalOrig();
1503     TGeoHMatrix* matTtoL = fTPCParam->Tracking2LocalMatrix(globMatrix,36+18+cnt-1);
1504     alignableEntry->SetMatrix(matTtoL);
1505   }
1506 }
1507
1508 //_____________________________________________________________________________
1509 void AliTPCv2::DrawDetector() const
1510 {
1511   //
1512   // Draw a shaded view of the Time Projection Chamber version 1
1513   //
1514
1515   // Set everything unseen
1516   gMC->Gsatt("*", "seen", -1);
1517   // 
1518   // Set ALIC mother transparent
1519   gMC->Gsatt("ALIC","SEEN",0);
1520   //
1521   // Set the volumes visible
1522   //
1523
1524   gMC->Gsatt("TPC ","SEEN",0);
1525   gMC->Gsatt("TOIN","SEEN",1);
1526   gMC->Gsatt("TOIN","COLO",7);
1527   gMC->Gsatt("TOCV","SEEN",1);
1528   gMC->Gsatt("TOCV","COLO",4);
1529   gMC->Gsatt("TSA1","SEEN",0);
1530   gMC->Gsatt("TSA2","SEEN",0);
1531   gMC->Gsatt("TSA3","SEEN",0);
1532   gMC->Gsatt("TSA4","SEEN",0);  
1533   gMC->Gsatt("TSA5","SEEN",0);
1534   gMC->Gsatt("TOFC","SEEN",1);
1535   gMC->Gsatt("TOFC","COLO",4);
1536   gMC->Gsatt("TSA6","SEEN",0);
1537   gMC->Gsatt("TSA7","SEEN",0);
1538   gMC->Gsatt("TSA8","SEEN",0);    
1539   gMC->Gsatt("TIIN","SEEN",1);
1540   gMC->Gsatt("TIIN","COLO",7);
1541   gMC->Gsatt("TII1","SEEN",0);
1542   gMC->Gsatt("TIFC","SEEN",1);
1543   gMC->Gsatt("TIFC","COLO",4);
1544   gMC->Gsatt("TSA9","SEEN",0); 
1545   gMC->Gsatt("TS10","SEEN",0);
1546   gMC->Gsatt("TS11","SEEN",0);
1547   gMC->Gsatt("TS12","SEEN",0);
1548   gMC->Gsatt("TS13","SEEN",0);
1549   gMC->Gsatt("TS14","SEEN",0);
1550   gMC->Gsatt("TICC","SEEN",0);
1551   gMC->Gsatt("TICM","SEEN",0);
1552   gMC->Gsatt("TS15","SEEN",0);
1553   gMC->Gsatt("TS16","SEEN",0);
1554   gMC->Gsatt("TS17","SEEN",0);
1555   gMC->Gsatt("TS18","SEEN",0);  
1556   gMC->Gsatt("TS19","SEEN",0); 
1557   gMC->Gsatt("TPJ1","SEEN",0);
1558   gMC->Gsatt("TPJ2","SEEN",0);
1559   gMC->Gsatt("TICS","SEEN",0);
1560   gMC->Gsatt("TDGN","SEEN",0); 
1561   gMC->Gsatt("TIRC","SEEN",0);
1562   gMC->Gsatt("TIC1","SEEN",1);
1563   gMC->Gsatt("TIPP","SEEN",0);
1564   gMC->Gsatt("TIC3","SEEN",0);
1565   gMC->Gsatt("TRCE","SEEN",0);
1566   gMC->Gsatt("TPSC","SEEN",0);
1567   gMC->Gsatt("TPCC","SEEN",0); 
1568   gMC->Gsatt("TORC","SEEN",0);
1569   gMC->Gsatt("TOPP","SEEN",0);
1570   gMC->Gsatt("TOC3","SEEN",0);
1571   gMC->Gsatt("TOC1","SEEN",1);
1572   gMC->Gsatt("TSSW","SEEN",1);
1573   gMC->Gsatt("TSWC","SEEN",1);
1574   gMC->Gsatt("TSSW","COLO",3);
1575   gMC->Gsatt("TSWC","COLO",3);
1576   gMC->Gsatt("TSCE","COLO",6);
1577   gMC->Gsatt("TSCE","SEEN",1);
1578   gMC->Gsatt("TWES","SEEN",0);
1579   gMC->Gsatt("TSWB","SEEN",0);
1580   gMC->Gsatt("TPEL","SEEN",0);
1581   gMC->Gsatt("TPMW","SEEN",1);
1582   gMC->Gsatt("TESR","SEEN",1);
1583   gMC->Gsatt("TPMW","COLO",12);
1584   gMC->Gsatt("TIC1","COLO",5);
1585   gMC->Gsatt("TOC1","COLO",5);
1586   gMC->Gsatt("TESB","SEEN",0);
1587   gMC->Gsatt("THVM","SEEN",1);
1588   gMC->Gsatt("THVM","COLO",11);
1589   gMC->Gsatt("THVH","SEEN",0);
1590   gMC->Gsatt("TPSR","SEEN",0); 
1591   gMC->Gsatt("THVL","SEEN",0);
1592   gMC->Gsatt("THVC","SEEN",0);  
1593   gMC->Gsatt("THVE","SEEN",0);
1594   gMC->Gsatt("THVR","SEEN",0);
1595   gMC->Gsatt("TPSS","SEEN",0);
1596   gMC->Gsatt("TPUS","SEEN",0);
1597   gMC->Gsatt("TPLS","SEEN",0);
1598
1599   //
1600   gMC->Gdopt("hide", "on");
1601   gMC->Gdopt("shad", "on");
1602   gMC->Gsatt("*", "fill", 7);
1603   gMC->SetClipBox(".");
1604   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1605   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1606   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1607   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1608   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1609   gMC->DefaultRange();
1610   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1611   gMC->Gdhead(1111, "Time Projection Chamber");
1612   gMC->Gdman(18, 4, "MAN");
1613   gMC->Gdopt("hide","off");
1614 }
1615
1616 //_____________________________________________________________________________
1617 void AliTPCv2::CreateMaterials()
1618 {
1619   //
1620   // Define materials for version 2 of the Time Projection Chamber
1621   //
1622  
1623   AliTPC::CreateMaterials();
1624 }
1625
1626 //_____________________________________________________________________________
1627 void AliTPCv2::Init()
1628 {
1629   //
1630   // Initialises version 2 of the TPC after that it has been built
1631   //
1632
1633   Int_t *idtmed = fIdtmed->GetArray();
1634   
1635   AliTPC::Init();
1636
1637  
1638   fIdSens=gMC->VolId("TPC_Strip");  // one strip is always selected...
1639
1640   fIDrift=gMC->VolId("TPC_Drift");
1641   fSecOld=-100; // fake number 
1642
1643   gMC->SetMaxNStep(-30000); // max. number of steps increased
1644
1645   if (fPrimaryIonisation) {
1646     // for FLUKA
1647       gMC->Gstpar(idtmed[2],"PRIMIO_E", 20.77); // 1st ionisation potential
1648  
1649       gMC->Gstpar(idtmed[2],"PRIMIO_N", 14.35);
1650       gMC->Gstpar(idtmed[2],"LOSS", 14); // specific energy loss
1651       gMC->Gstpar(idtmed[2],"STRA",4);
1652   } 
1653   // specific energy loss for geant3 is now defined in galice.cuts
1654
1655
1656   AliDebug(1,"*** TPC version 2 initialized ***");
1657   AliDebug(1,Form("Maximum number of steps = %d",gMC->GetMaxNStep()));
1658
1659   //
1660   
1661 }
1662
1663 //_____________________________________________________________________________
1664 void AliTPCv2::StepManager()
1665 {
1666   //
1667   // Called for every step in the Time Projection Chamber
1668   //
1669
1670   //
1671   // parameters used for the energy loss calculations
1672   //
1673   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1674   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1675   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1676   const Int_t   kMaxDistRef =15;     // maximal difference between 2 stored references 
1677  
1678   const Float_t kbig = 1.e10;
1679
1680   Int_t id,copy;
1681   Float_t hits[5];
1682   Int_t vol[2];  
1683   TLorentzVector p;
1684   
1685   vol[1]=0; // preset row number to 0
1686   //
1687   if (!fPrimaryIonisation) gMC->SetMaxStep(kbig);
1688   
1689   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1690   
1691   Float_t charge = gMC->TrackCharge();
1692   
1693   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1694   
1695   // check the sensitive volume
1696
1697   id = gMC->CurrentVolID(copy); // vol ID and copy number (starts from 1!)
1698   if(id != fIDrift && id != fIdSens) return; // not in the sensitive folume 
1699
1700   gMC->TrackPosition(p);
1701   Double_t r = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1702   //
1703   
1704   //
1705   Double_t angle = TMath::ACos(p[0]/r);  
1706   angle = (p[1]<0.) ? TMath::TwoPi()-angle : angle;
1707   //
1708   // angular segment, it is not a real sector number...
1709   //
1710   Int_t sector=TMath::Nint((angle-fTPCParam->GetInnerAngleShift())/
1711                fTPCParam->GetInnerAngle());
1712   // rotate to segment "0"
1713   Float_t cos,sin;
1714   fTPCParam->AdjustCosSin(sector,cos,sin);
1715   Float_t x1=p[0]*cos + p[1]*sin;
1716   // check if within sector's limits
1717   if((x1>=fTPCParam->GetInnerRadiusLow()&&x1<=fTPCParam->GetInnerRadiusUp())
1718      ||(x1>=fTPCParam->GetOuterRadiusLow()&&x1<=fTPCParam->GetOuterRadiusUp())){
1719   // calculate real sector number...
1720   if (x1>fTPCParam->GetOuterRadiusLow()){
1721     sector = TMath::Nint((angle-fTPCParam->GetOuterAngleShift())/
1722              fTPCParam->GetOuterAngle())+fTPCParam->GetNInnerSector();
1723     if (p[2]<0)         sector+=(fTPCParam->GetNOuterSector()>>1);
1724   }
1725     else   
1726       if (p[2]<0) sector+=(fTPCParam->GetNInnerSector()>>1);  
1727   //
1728   // here I have a sector number
1729   //
1730
1731   vol[0]=sector;
1732
1733   static Double_t lastReferenceR=0;
1734   if (TMath::Abs(lastReferenceR-r)>kMaxDistRef){
1735     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTPC);
1736     lastReferenceR = r;
1737   }
1738
1739   // check if change of sector
1740   if(sector != fSecOld){
1741     fSecOld=sector;
1742     // add track reference
1743     AddTrackReference(gAlice->GetMCApp()->GetCurrentTrackNumber(), AliTrackReference::kTPC);
1744   }  
1745   // track is in the sensitive strip
1746   if(id == fIdSens){
1747     // track is entering the strip
1748     if (gMC->IsTrackEntering()){
1749       Int_t totrows = fTPCParam->GetNRowLow()+fTPCParam->GetNRowUp();
1750       vol[1] = (copy<=totrows) ? copy-1 : copy-1-totrows;
1751       // row numbers are autonomous for lower and upper sectors
1752       if(vol[0] > fTPCParam->GetNInnerSector()) {
1753         vol[1] -= fTPCParam->GetNRowLow();
1754       }
1755     //
1756       if(vol[0]<fTPCParam->GetNInnerSector()&&vol[1] == 0){
1757   
1758         // lower sector, row 0, because Jouri wants to have this
1759
1760         gMC->TrackMomentum(p);
1761         hits[0]=p[0];
1762         hits[1]=p[1];
1763         hits[2]=p[2];
1764         hits[3]=0.; // this hit has no energy loss
1765         // Get also the track time for pileup simulation
1766         hits[4]=gMC->TrackTime();
1767
1768         AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  
1769       }
1770     //
1771
1772        gMC->TrackPosition(p);
1773        hits[0]=p[0];
1774        hits[1]=p[1];
1775        hits[2]=p[2];
1776        hits[3]=0.; // this hit has no energy loss
1777        // Get also the track time for pileup simulation
1778        hits[4]=gMC->TrackTime();
1779
1780        AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);  
1781     
1782     }
1783     else return;
1784   }  
1785   //-----------------------------------------------------------------
1786   //  charged particle is in the sensitive drift volume
1787   //-----------------------------------------------------------------
1788   if(gMC->TrackStep() > 0) {
1789     Int_t nel=0;
1790     if (!fPrimaryIonisation) {
1791       nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1792     }
1793     else {
1794           Float_t edep = gMC->Edep();
1795           if (edep > 0.) nel = (Int_t)((gMC->Edep()*1.5)/kwIon) + 1;      
1796     }
1797     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1798     //
1799     gMC->TrackPosition(p);
1800     hits[0]=p[0];
1801     hits[1]=p[1];
1802     hits[2]=p[2];
1803     hits[3]=(Float_t)nel;
1804
1805     // Add this hit
1806
1807     if (fHitType&&2){
1808       gMC->TrackMomentum(p);
1809       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
1810       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
1811       fTrackHits->SetHitPrecision(precision);
1812     }
1813
1814     // Get also the track time for pileup simulation
1815     hits[4]=gMC->TrackTime();
1816  
1817     AddHit(gAlice->GetMCApp()->GetCurrentTrackNumber(), vol,hits);
1818     if (fDebugStreamer){   
1819       // You can dump here what you need
1820       // function  CreateDebugStremer() to be called in the Config.C  macro
1821       // if you want to enable it
1822       // By default debug streaemer is OFF
1823       Float_t edep = gMC->Edep();
1824       Float_t tstep = gMC->TrackStep();
1825       Int_t pid=gMC->TrackPid();
1826       (*fDebugStreamer)<<"hit"<<      
1827         "x="<<hits[0]<<  // hit position
1828         "y="<<hits[1]<<
1829         "z="<<hits[2]<<
1830         "nel="<<hits[3]<<  // number of electorns
1831         "tof="<<hits[4]<<  // hit TOF
1832         "edep="<<edep<<    // energy deposit
1833         "pid="<<pid<<      // pid
1834         "step="<<tstep<<
1835         "p.="<<&p<<
1836         "\n";
1837     }
1838     
1839   } // step>0 
1840   } //within sector's limits
1841   // Stemax calculation for the next step
1842   
1843   Float_t pp;
1844   TLorentzVector mom;
1845   // below is valid only for Geant3 (fPromaryIonisation not set)
1846   if(!fPrimaryIonisation){
1847     gMC->TrackMomentum(mom);
1848     Float_t ptot=mom.Rho();
1849     Float_t betaGamma = ptot/gMC->TrackMass();
1850
1851     Int_t pid=gMC->TrackPid();
1852     if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1853       { 
1854         pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1855       }
1856     else
1857       {
1858
1859         betaGamma = TMath::Max(betaGamma,(Float_t)7.e-3); // protection against too small bg
1860         pp=kprim*AliMathBase::BetheBlochAleph(betaGamma); 
1861    
1862     }
1863   
1864     Double_t rnd = gMC->GetRandom()->Rndm();
1865   
1866     gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1867   }
1868   
1869 }
1870
1871