8056dc7eeebb7a8b73dabbd2a6dc67d35edfda9b
[u/mrichter/AliRoot.git] / TPC / AliTPCv2.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 /*
17 $Log$
18 Revision 1.30  2000/11/14 10:48:57  kowal2
19 Correct material used for TSA4. Thanks to J. Barbosa.
20
21 Revision 1.29  2000/11/06 17:24:10  kowal2
22 Corrected bug in the outer containment vessel and
23 the outer field cage geometry.
24 Thanks to J. Barbosa.
25
26 Revision 1.28  2000/11/02 16:55:24  kowal2
27 Corrected bug in the inner containment vessel geometry.
28 Thanks to J. Belikov
29
30 Revision 1.27  2000/11/02 07:24:11  kowal2
31 Correction in the TPC geometry.
32 Changes due to the new hit structure.
33
34 Revision 1.26  2000/10/05 16:16:29  kowal2
35 Corrections of the hit recording algorithm.
36
37 Revision 1.25  2000/10/02 21:28:18  fca
38 Removal of useless dependecies via forward declarations
39
40 Revision 1.24  2000/08/28 10:02:30  kowal2
41 Corrected bug in the StepManager
42
43 Revision 1.23  2000/07/10 20:57:39  hristov
44 Update of TPC code and macros by M.Kowalski
45
46 Revision 1.22  2000/06/30 12:07:50  kowal2
47 Updated from the TPC-PreRelease branch
48
49 Revision 1.21.2.4  2000/06/26 07:39:42  kowal2
50 Changes to obey the coding rules
51
52 Revision 1.21.2.3  2000/06/25 08:38:41  kowal2
53 Splitted from AliTPCtracking
54
55 Revision 1.21.2.2  2000/06/16 12:58:13  kowal2
56 Changed parameter settings
57
58 Revision 1.21.2.1  2000/06/09 07:15:07  kowal2
59
60 Defaults loaded automatically (hard-wired)
61 Optional parameters can be set via macro called in the constructor
62
63 Revision 1.21  2000/05/15 10:00:30  kowal2
64 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
65
66 Revision 1.20  2000/04/17 09:37:33  kowal2
67 removed obsolete AliTPCDigitsDisplay.C
68
69 Revision 1.19.8.2  2000/04/10 08:31:52  kowal2
70
71 Different geometry for different sectors
72 Updated readout chambers
73 Some modifications to StepManager by J.Belikov
74
75 Revision 1.19.8.1  2000/04/10 07:56:53  kowal2
76 Not used anymore - removed
77
78 Revision 1.19  1999/11/04 17:28:07  fca
79 Correct barrel part of HV Degrader
80
81 Revision 1.18  1999/10/14 16:52:08  fca
82 Only use PDG codes and not GEANT ones
83
84 Revision 1.17  1999/10/08 06:27:23  fca
85 Corrected bug in the HV degrader geometry, thanks to G.Tabary
86
87 Revision 1.16  1999/10/04 13:39:54  fca
88 Correct array index problem
89
90 Revision 1.15  1999/09/29 09:24:34  fca
91 Introduction of the Copyright and cvs Log
92
93 */
94
95 //
96 ///////////////////////////////////////////////////////////////////////////////
97 //                                                                           //
98 //  Time Projection Chamber version 2 -- detailed TPC and slow simulation    //
99 //                                                                           //
100 //Begin_Html
101 /*
102 <img src="picts/AliTPCv2Class.gif">
103 */
104 //End_Html
105 //                                                                           //
106 //                                                                           //
107 ///////////////////////////////////////////////////////////////////////////////
108 #include <stdlib.h>
109
110 #include <TMath.h>
111
112 #include "AliTPCv2.h"
113 #include "AliTPCDigitsArray.h"
114 #include "AliRun.h"
115 #include "AliMC.h"
116 #include "AliConst.h"
117 #include "AliPDG.h"
118 #include "AliTPCParam.h"
119 #include "AliTPCParamSR.h"
120 #include "AliTPCTrackHits.h"
121 #include "TLorentzVector.h"
122
123
124 ClassImp(AliTPCv2)
125  
126 //_____________________________________________________________________________
127 AliTPCv2::AliTPCv2(const char *name, const char *title) :
128   AliTPC(name, title) 
129 {
130   //
131   // Standard constructor for Time Projection Chamber version 2
132   //
133   fIdSens=0;
134   fIdLSec=0;
135   fIdUSec=0;
136
137   SetBufferSize(128000);
138
139   SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10
140
141   // Default sectors
142
143   SetSecAL(4);
144   SetSecAU(4);
145   SetSecLows(1,  2,  3, 19, 20, 21);
146   SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1);
147   SetSens(1); // sensitive strips set 
148
149   if (fTPCParam)
150      fTPCParam->Write(fTPCParam->GetTitle());
151 }
152  
153 //_____________________________________________________________________________
154 void AliTPCv2::CreateGeometry()
155 {
156   //
157   // Create the geometry of Time Projection Chamber version 2
158   //
159   //Begin_Html
160   /*
161     <img src="picts/AliTPC.gif">
162   */
163   //End_Html
164   //Begin_Html
165   /*
166     <img src="picts/AliTPCv2Tree.gif">
167   */
168   //End_Html
169
170
171   Int_t *idtmed = fIdtmed->GetArray();
172
173   Float_t dm[50];
174   Int_t idrotm[120];
175
176   Int_t nRotMat = 0;
177
178   Int_t i,ifl1=0;
179
180   // number of sectors
181
182   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
183   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
184   
185   // --------------------------------------------------- 
186   //        sector specification check 
187   // --------------------------------------------------- 
188   if (fSecAL >= 0) {
189     ifl1 = 0;
190     
191     for (i = 0; i < 6; ++i) {
192       if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
193         ifl1 = 1;
194         printf("*** SECTOR %d selected\n",fSecLows[i]);
195       }
196     }
197
198   } else {
199     printf("*** ALL LOWER SECTORS SELECTED ***\n");
200     ifl1 = 1;
201   }
202
203   if (ifl1 == 0) {
204     printf("*** ERROR: AT LEAST ONE LOWER SECTOR MUST BE SPECIFIED ***\n");
205     printf("!!! PROGRAM STOPPED !!!\n");
206     exit(1);
207   }
208
209   if (fSecAU >= 0) {
210     
211     for (i = 0; i < 12; ++i) {
212       if (fSecUps[i] > 2*nInnerSector-1 && 
213           fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
214         printf("*** SECTOR %d selected\n",fSecUps[i]);
215       }
216     }
217     
218   } else {
219     printf("*** ALL UPPER SECTORS SELECTED ***\n");
220   }
221   
222  
223
224   //--------------------------------------------------------------------
225
226   //
227   //  Mother volume (Air) - all volumes will be positioned in it
228   //
229   
230   dm[0]=0.;
231   dm[1]=360.;
232   dm[2]=12.;
233
234   //
235  
236   dm[3]= -283.7;
237   dm[4]= 66.2;
238   dm[5]= 277.95;
239
240   //
241
242   dm[6]= -255.6;
243   dm[7]= 66.2;
244   dm[8]= 277.95;
245
246   //
247
248   dm[9]= -73.3;
249   dm[10]= 59.0;
250   dm[11]= 277.95;
251
252   //
253
254   dm[12]= -73.3;
255   dm[13]= 56.9;
256   dm[14]= 277.95;
257
258   //
259
260   dm[15]= -72.1;
261   dm[16]= 56.9;
262   dm[17]= 277.95;
263
264   //
265
266   dm[18]= -72.1;
267   dm[19]= 60.65;
268   dm[20]= 277.95;
269
270   //
271
272   dm[21]= 72.1;
273   dm[22]= 60.65;
274   dm[23]= 277.95;  
275
276   //
277
278   dm[24]= 72.1;
279   dm[25]= 56.9;
280   dm[26]= 277.95;
281
282   //
283
284   dm[27]= 73.3;
285   dm[28]= 56.9;
286   dm[29]= 277.95;
287
288   //
289
290   dm[30]= 73.3;
291   dm[31]= 60.65;
292   dm[32]= 277.95;
293
294   //
295
296   dm[33]= 250.4;
297   dm[34]= 66.0;
298   dm[35]= 277.95;
299
300   //
301
302   dm[36]= 283.7;
303   dm[37]= 66.0;
304   dm[38]= 277.95;
305
306
307   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
308
309
310   //-------------------------------------------------------------------
311   //  Tpc Outer INsulator (CO2)
312   //-------------------------------------------------------------------
313
314   dm[0]= 0.;
315   dm[1]= 360.;
316   dm[2]= 6.;
317
318   //
319  
320   dm[3]= -253.6;
321   dm[4]= 258.;
322   dm[5]= 266.65;
323
324   //
325
326   dm[6]= -253.;
327   dm[7]= 258.;
328   dm[8]= 266.65;
329
330   dm[9]= -253.;
331   dm[10]= 258.;
332   dm[11]= 277.97;
333
334   dm[12]= 253.6;
335   dm[13]= 258.;
336   dm[14]= 277.97;
337
338   //
339
340   dm[15]= 253.6;
341   dm[16]= 265.2;
342   dm[17]= 277.95;
343
344   //
345
346   dm[18]= 255.6;
347   dm[19]= 265.2;
348   dm[20]= 277.95;
349
350
351   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
352
353   //---------------------------------------------------------------
354   // shreds (G10) - TPC Rings
355   //---------------------------------------------------------------
356
357   gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
358
359   dm[0]= 258.;
360   dm[1]= 266.65;
361   dm[2]= 0.3;
362
363   gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
364
365   //
366
367   dm[0]= 258.;
368   dm[1]= 270.9;
369   dm[2]= 0.3;
370
371   gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
372
373   //
374
375   dm[0]= 272.2;
376   dm[1]= 277.95;
377   dm[2]= 0.3;
378
379   gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
380
381   //----------------------------------------------------------------
382   // Tpc Outer Contaiment Vessel  
383   //  mother volume - Al, daughters - composite (sandwich)
384   //----------------------------------------------------------------
385   
386   dm[0]= 0.;
387   dm[1]= 360.;
388   dm[2]=6.;
389
390   //
391
392   dm[3]= -250.4;
393   dm[4]= 272.2;
394   dm[5]= 277.95;
395
396   //
397
398   dm[6]= -248.4;
399   dm[7]= 272.2;
400   dm[8]= 277.95;
401
402   //
403   dm[9]= -248.4;
404   dm[10]= 274.81;
405   dm[11]= 277.95;
406   //
407
408   dm[12]= 253.6;
409   dm[13]= 274.81;
410   dm[14]= 277.95;
411
412   //
413
414   dm[15]= 253.6;
415   dm[16]= 265.2;
416   dm[17]= 277.95;
417
418   // 
419
420   dm[18]= 255.6;
421   dm[19]= 265.2;
422   dm[20]= 277.95;
423
424   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
425
426   // Daughter volumes
427
428   // Tpc SAndwich 1 - Al
429  
430   dm[0]= 274.81;
431   dm[1]= 277.95;
432   dm[2]= 251.7;
433
434   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
435
436   // Tpc SAndwich 2 - Tedlar
437
438   dm[0] += 5.e-3;
439   dm[1] -= 5.e-3;
440   
441   gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
442
443   // Tpc SAndwich 3 - Kevlar
444
445   dm[0] += 5e-3;
446   dm[1] -= 5.e-3;
447
448   gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
449
450   // Tpc SAndwich 4 - NOMEX honeycomb
451
452   dm[0] += 0.06;
453   dm[1] -= 0.06;
454
455   gMC->Gsvolu("TSA4","TUBE",idtmed[6],dm,3);  
456   
457   // 4->3->2->1->TOCV
458
459   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
460   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
461   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
462
463   gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
464
465   // TCOV-> TOIN
466
467   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
468
469   //-------------------------------------------------------
470   //  Tpc Outer Field Cage
471   //  mother volume - Al, daughters - composite (sandwich)
472   //-------------------------------------------------------
473
474   dm[0]=0.;
475   dm[1]=360.;
476   dm[2]=6.;
477
478   dm[3]= -253.;
479   dm[4]= 258.;
480   dm[5]= 277.95;
481
482   //
483
484   dm[6]= -251.;
485   dm[7]= 258.;
486   dm[8]= 277.95;
487
488   //
489  
490   dm[9]= -251.;
491   dm[10]= 258.;
492   dm[11]= 260.05;
493
494   //
495
496   dm[12]= 251.;
497   dm[13]= 258.;
498   dm[14]= 260.05;
499
500   //
501
502   dm[15]= 251.;
503   dm[16]= 258.;
504   dm[17]= 270.9;
505
506   //
507
508   dm[18]= 253.;
509   dm[19]= 258.;
510   dm[20]= 270.9;
511
512   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);  
513
514   // Daughter volumes 
515
516   // Tpc SAndwich 5 - Tedlar
517
518   dm[0]= 258.;
519   dm[1]= 260.05;
520   dm[2]= 251.7;
521
522   gMC->Gsvolu("TSA5","TUBE",idtmed[9],dm,3);
523
524   // Tpc SAndwich 6 - Kevlar
525
526   dm[0] += 5.e-3;
527   dm[1] -= 5.e-3;
528
529   gMC->Gsvolu("TSA6","TUBE",idtmed[5],dm,3);
530
531
532   // Tpc SAndwich 8 - NOMEX
533
534   dm[0] += 0.02;
535   dm[1] -= 0.02;
536
537   gMC->Gsvolu("TSA7","TUBE",idtmed[6],dm,3);    
538
539   // 7->6->5->TOFC
540
541   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
542   gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY"); 
543
544   gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
545
546   // TOFC->TOIN
547
548   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY"); 
549
550   // TOIN->TPC
551
552   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
553
554   //--------------------------------------------------------------------
555   // Tpc Inner INsulator (CO2)
556   //--------------------------------------------------------------------
557
558
559   dm[0]=0.;
560   dm[1]= 360.;
561   dm[2]= 15.;
562
563   //
564
565   dm[3]= -255.6;
566   dm[4]= 66.2;
567   dm[5]= 74.8;
568
569   //
570
571   Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
572
573   dm[6]= -253.6;
574   dm[7]= 59.0+ (253.6-73.3)*tanL;
575   dm[8]= 74.8;
576
577   //
578
579   dm[9]= -253.6;
580   dm[10]= dm[7];
581   dm[11]= 79.2;
582
583   //
584
585   dm[12]= -73.3;
586   dm[13]= 59.0;
587   dm[14]= 79.2;
588
589   //
590
591   dm[15]= -73.3;
592   dm[16]= 56.9;
593   dm[17]= 79.2;
594
595   //
596
597   dm[18]= -72.1;
598   dm[19]= 59.6;
599   dm[20]= 79.2;
600
601   //
602
603   dm[21]= -72.1;
604   dm[22]= 60.65;
605   dm[23]= 79.2;
606
607   //
608
609   dm[24]= 72.1;
610   dm[25]= 60.65;
611   dm[26]= 79.2;  
612
613   //
614
615   dm[27]= 72.1;
616   dm[28]= 59.6;
617   dm[29]= 79.2;
618
619   //
620
621   dm[30]= 73.3;
622   dm[31]= 56.9;
623   dm[32]= 79.2;
624
625   //
626
627   dm[33]= 73.3;
628   dm[34]= 59.0;
629   dm[35]= 79.2;
630
631   //
632
633   dm[36]= 250.4;
634   dm[37]= 66.0;
635   dm[38]= 79.2;
636
637   //
638   
639   dm[39]= 253.0;
640   dm[40]= 66.0;
641   dm[41]= 79.2;
642
643   //
644
645   dm[42]= 253.0;
646   dm[43]= 75.3;
647   dm[44]= 79.2;
648
649   //
650
651   dm[45]= 253.6;
652   dm[46]= 75.3;
653   dm[47]= 79.2;
654
655   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
656
657
658   //--------------------------------------------------------------------
659   //  Tpc Inner Containment vessel, Left part
660   //  mother volume - Al, daughter - composite (sandwich)
661   //--------------------------------------------------------------------
662
663   dm[0]= 0.;
664   dm[1]= 360.;
665   dm[2]= 8.;
666
667   //
668
669   dm[3]= -255.6;
670   dm[4]= 66.2;
671   dm[5]= 74.8;
672
673   //
674
675   Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
676   Float_t sandThick = 2.14; // cone composite thickness
677
678
679   //
680
681   dm[6]= -253.6;
682   dm[7]= 59.0 + (253.6-73.3)*tanL;
683   dm[8]= 74.8;
684
685   //
686
687   dm[9]= -253.6;
688   dm[10]= dm[7];
689   dm[11]= dm[7]+sandThick/cosL;
690
691   //
692
693   dm[12]= -75.6;
694   dm[13]= 59.0+(75.6-73.3)*tanL;
695   dm[14]= dm[13]+sandThick/cosL;
696
697   //
698
699   dm[15]= -75.6;
700   dm[16]= dm[13];
701   dm[17]= 60.65;
702
703   //
704
705   dm[18]= -73.3;
706   dm[19]= 59.0;
707   dm[20]= 60.65;
708
709   //
710
711   dm[21]= -73.3;
712   dm[22]= 56.9;
713   dm[23]= 60.65;
714
715   //
716
717   dm[24]= -72.1;
718   dm[25]= 56.9;
719   dm[26]= 60.65;
720
721   gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
722
723   // Daughter volumes 
724
725   // Tpc SAndwich 9 - Al
726
727   dm[0]= 0.;
728   dm[1]= 360.;
729   dm[2]= 2.;
730
731   //
732
733   dm[3]= - 254.3;
734   dm[4]= 59.0+(254.3-73.3)*tanL;
735   dm[5]= dm[4]+sandThick/cosL;
736
737   //
738
739   dm[6]= -78.3;
740   dm[7]= 59.0+(78.3-73.3)*tanL;
741   dm[8]= dm[7]+sandThick/cosL;
742
743   //
744
745   gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
746
747   // Tpc SAndwich 10 - Tedlar
748
749   dm[4]+= 5.e-3/cosL;
750   dm[5]-= 5.e-3/cosL;
751
752   //
753
754   dm[7]+= 5.e-3/cosL;
755   dm[8]+= 5.e-3/cosL;
756
757   gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9); 
758
759   // Tpc SAndwich 11 - Kevlar
760
761   dm[4]+= 5.e-3/cosL;
762   dm[5]-= 5.e-3/cosL;
763
764   //
765
766   dm[7]+= 5.e-3/cosL;
767   dm[8]+= 5.e-3/cosL;
768
769   gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9); 
770
771   // Tpc SAndwich 12 - NOMEX
772
773   dm[4]+= 0.06/cosL;
774   dm[5]-= 0.06/cosL;
775
776   //
777
778   dm[7]+= 0.06/cosL;
779   dm[8]+= 0.06/cosL;
780
781   gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);   
782
783   // 12->11->10->9
784
785   gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
786   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
787   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
788
789   // TSA9->TICL
790
791   gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
792  
793   //--------------------------------------------------------------------
794   //  Tpc Inner Containment vessel, Right part
795   //  mother volume - Al, daughter - composite (sandwich)
796   //--------------------------------------------------------------------
797
798   dm[0]= 0.;
799   dm[1]= 360.;
800   dm[2]=8.;
801
802   //
803
804   dm[3]= 72.1;
805   dm[4]= 56.9;
806   dm[5]= 60.65;
807
808   //
809
810   dm[6]= 73.3;
811   dm[7]= 56.9;
812   dm[8]= 60.65;
813
814   //
815
816   dm[9]= 73.3;
817   dm[10]= 59.0;
818   dm[11]= 60.65;
819
820   //
821
822   Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
823   Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
824
825   //
826
827   dm[12]= 75.6;
828   dm[13]= 59.0+(75.6-73.3)*tanR;
829   dm[14]= 60.65;
830
831   //
832
833   dm[15]= 75.6;
834   dm[16]= dm[13];
835   dm[17]= dm[16]+sandThick/cosR;
836
837   //
838
839   dm[18]= 248.4;
840   dm[19]= 59.0+(248.4-73.3)*tanR;
841   dm[20]= dm[19]+sandThick/cosR;
842
843   //
844
845   dm[21]= 248.4;
846   dm[22]= dm[19];
847   dm[23]= 70.2;
848
849   //
850
851   dm[24]= 250.4;
852   dm[25]= 66.0;
853   dm[26]= 70.2;
854
855   gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
856
857
858
859   // Daughter volumes 
860
861   // Tpc SAndwich 13 - Al
862
863   dm[0]= 0.;
864   dm[1]= 360.;
865   dm[2]= 2.;
866
867   //
868
869   dm[3]= 78.3;
870   dm[4]= 59.0+(78.3-73.3)*tanR;
871   dm[5]= dm[4]+sandThick/cosR;
872
873   //
874
875   dm[6]= 249.1;
876   dm[7]= 59.0+(249.1-73.3)*tanR;
877   dm[8]= dm[7]+sandThick/cosR;
878
879   //
880
881   gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
882
883   // Tpc SAndwich 14 - Tedlar
884
885   dm[4]+= 5.e-3/cosR;
886   dm[5]-= 5.e-3/cosR;
887
888   //
889
890   dm[7]+= 5.e-3/cosR;
891   dm[8]+= 5.e-3/cosR;
892
893   gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9); 
894
895   // Tpc SAndwich 15 - Kevlar
896
897   dm[4]+= 5.e-3/cosR;
898   dm[5]-= 5.e-3/cosR;
899
900   //
901
902   dm[7]+= 5.e-3/cosR;
903   dm[8]+= 5.e-3/cosR;
904
905   gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9); 
906
907   // Tpc SAndwich 16 - NOMEX
908
909   dm[4]+= 0.06/cosR;
910   dm[5]-= 0.06/cosR;
911
912   //
913
914   dm[7]+= 0.06/cosR;
915   dm[8]+= 0.06/cosR;
916
917   gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);   
918
919   // 16->15->14->13
920
921   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
922   gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
923   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
924
925   // TS12->TICR
926
927   gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
928
929   //------------------------------------------------------
930   // Tpc Inner Field Cage
931   // mother volume - Al, daughters - composite (sandwich)
932   //------------------------------------------------------
933
934   dm[0]= 0.;
935   dm[1]= 360.;
936   dm[2]=6.;
937
938   //
939
940   dm[3]= -253.0;
941   dm[4]= 70.7;
942   dm[5]= 79.2;
943
944   //
945
946   dm[6]= -251.0;
947   dm[7]= 70.7;
948   dm[8]= 79.2;
949
950   //
951
952   dm[9]= -251.0;
953   dm[10]= 77.15;
954   dm[11]= 79.2;
955
956   //
957   
958   dm[12]= 251.0;
959   dm[13]= 77.15;
960   dm[14]= 79.2;
961
962   //
963
964   dm[15]= 251.0;
965   dm[16]= 66.0;
966   dm[17]= 79.2;
967
968   //
969
970   dm[18]= 253.0;
971   dm[19]= 66.0;
972   dm[20]= 79.2;
973
974   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
975
976   // Daughter volumes
977
978   // Tpc Sandwich 17 - Tedlar
979
980   dm[0]= 77.15;
981   dm[1]= 79.2;
982   dm[2]= 251.7;
983
984   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
985
986   // Tpc Sandwich 18 - Kevlar
987
988   dm[0]+= 5.e-3;
989   dm[1]-= 5.e-3;
990
991   gMC->Gsvolu("TS18","TUBE",idtmed[5],dm,3);
992
993
994   // Tpc Sandwich 19 - NOMEX
995
996   dm[0]+= 0.02;
997   dm[1]-= 0.02;
998
999   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
1000
1001   // 19->18->17
1002
1003   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
1004   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
1005
1006   // TS17->TIFC
1007
1008   gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
1009
1010   // TPC Rings
1011
1012   dm[0]= 70.7;
1013   dm[1]= 79.2;
1014   dm[2]= 0.3;
1015
1016   gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
1017
1018   dm[0]= 66.0;
1019   dm[1]= 70.2;  
1020
1021   gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
1022
1023   dm[0]= 75.3;
1024   dm[1]= 79.2;  
1025
1026   gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);  
1027
1028   // TICL->TIIN
1029
1030   gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
1031
1032   // TICR->TIIN
1033
1034   gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
1035
1036   // TIFC->TIIN
1037
1038   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
1039
1040   // Tpc Sandwich 21 - Al (central barrel)
1041
1042   dm[0]= 60.65;
1043   dm[1]= 61.21;
1044   dm[2]= 75.2;
1045
1046   gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
1047
1048   // Tpc Sandwich 22 - Tedlar (central barrel) 
1049
1050   dm[0]+= 5.e-3;
1051   dm[1]-= 5.e-3;
1052
1053   gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3); 
1054
1055   // Tpc Sandwich 23 - Kevlar (central barrel) 
1056
1057   dm[0]+= 5.e-3;
1058   dm[1]-= 5.e-3;
1059
1060   gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3); 
1061
1062   // Tpc Sandwich 24 - NOMEX (central barrel) 
1063
1064   dm[0]+= 0.02;
1065   dm[1]-= 0.02;
1066
1067   gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3); 
1068
1069   // 24->23->22->21
1070
1071   gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1072   gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1073   gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1074
1075   gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1076
1077   // put everything into the TPC 
1078
1079   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1080
1081
1082   //---------------------------------------------------------
1083   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1084   //  and its daughters (HV membrane, rods, readout chambers)
1085   //---------------------------------------------------------
1086
1087   dm[0]= 79.2;
1088   dm[1]= 258.0;
1089   dm[2]= 253.6;
1090
1091   gMC->Gsvolu("TDGN","TUBE",idtmed[1],dm,3);  // nonsensitive 
1092
1093     // sector opening angles
1094
1095   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1096   Float_t outerOpenAngle = fTPCParam->GetOuterAngle();
1097
1098   // sector angle shift
1099
1100   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1101
1102   // All above parameters are identical for inner and outer
1103   // sectors. The distinction is kept for the historical reasons
1104   // and eventually will disappear.
1105
1106   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1107   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1108   Float_t space;
1109
1110   //-------------------------------------------------------------------------
1111   //   Tpc Inner Readout Chambers 
1112   //-------------------------------------------------------------------------
1113
1114   dm[0]= 14.483;
1115   dm[1]= 23.3345; 
1116   dm[2]= 1.6; // thickness
1117   dm[3]= 25.1;
1118
1119   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1120
1121   // this volume will be positioned in the empty space
1122   // of the end-cap to avoid overlaps
1123
1124   dm[0]= 13.7305;
1125   dm[1]= 21.1895;
1126   dm[2]= 2.25;
1127   dm[3]= 21.15;
1128
1129   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1130
1131   //------------------------------------------------
1132   // Tpc Inner readout chamber Pad Plane
1133   //------------------------------------------------
1134
1135   dm[0]= 14.483;
1136   dm[1]= 23.3345;
1137   dm[2]= 0.5;
1138   dm[3]= 25.1;
1139
1140   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1141
1142   // 
1143
1144   dm[0] -= 1.218511934;
1145   dm[1] -= 1.218511934;
1146   dm[2] = 0.35;
1147
1148   gMC->Gsvolu("TIC3","TRD1",idtmed[1],dm,4);
1149
1150   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1151
1152   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1153
1154   //----------------------------------------------
1155   // Tpc Readout Chambers Empty spaces - for both
1156   // inner and outer sectors
1157   //----------------------------------------------
1158
1159   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1160
1161   // Inner sector - 4 spaces
1162
1163
1164   dm[3] = 4.7625;
1165   dm[0] = 12.472;
1166
1167   Float_t rr = 90.52;
1168   Float_t zz;
1169
1170   zz= -12.7875;
1171   
1172   space = rr*tanAlpha-dm[0];
1173
1174   for(Int_t nsLow=0;nsLow<4;nsLow++){
1175
1176     rr += 9.525;
1177     dm[1]= rr*tanAlpha - space;  
1178
1179     dm[2]=0.8;
1180
1181     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1182
1183     //
1184
1185     dm[2]= 1.2;
1186
1187     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1188
1189     rr += 0.4;
1190     dm[0] = rr*tanAlpha - space;
1191     zz += (0.4+9.525); 
1192
1193   }
1194
1195   dm[0]= 12.472;
1196   // dm[1] - this is the dm[1] from the previous TRCE
1197   dm[2]= 1.05;
1198   dm[3]= 19.65;
1199
1200   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.2,0.,0,"ONLY",dm,4); 
1201
1202   //
1203   // TPc Space for Connectors
1204   //
1205
1206   dm[0]= .3;
1207   dm[1]= .3;
1208   dm[2]= 4.5;
1209
1210   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1211
1212   // TPC Connectors
1213
1214   dm[0]= .25;
1215   dm[1]= .15;
1216   dm[2]= 3.75;
1217
1218   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3); 
1219
1220   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1221
1222   zz = -12.7875;
1223
1224   Float_t alpha;
1225   Float_t astep;
1226
1227   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1228
1229   // inner part of the inner sector - 2 x 20 holes
1230   
1231   astep = 20.00096874/19.;
1232
1233   alpha = 10.00048437-astep;
1234
1235   Float_t x1,x2;
1236
1237     x1 = 13.31175725;
1238     x1 -= 0.996357832; 
1239
1240     x2 = 15.06180253;
1241     x2 -= 1.163028812;
1242
1243   Int_t ncon;
1244
1245   for(ncon=0;ncon<20;ncon++){
1246
1247     phi1 = 0.;
1248     theta1 = 90.+alpha;
1249     phi2=90.;
1250     theta2 = 90.;
1251     phi3 = (alpha>0) ? 0. : 180.;
1252     theta3 = TMath::Abs(alpha);
1253
1254     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1255
1256  
1257
1258     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1259     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1260
1261
1262     x1 -= 1.296357833;
1263     x2 -= 1.463028812;
1264
1265     alpha -= astep;   
1266     nRotMat++; 
1267
1268   }
1269
1270   // outer part of the inner sector - 2 x 25 holes
1271
1272    astep = 20.00096874/24.; 
1273    alpha = 10.00048437-astep;
1274
1275    x1 = 16.81184781;
1276    x1 -= 1.016295986;
1277
1278    x2 = 18.5618931;
1279    x2 -= 1.150914854;
1280
1281   for(ncon=0;ncon<25;ncon++){
1282
1283     phi1 = 0.;
1284     theta1 = 90.+alpha;
1285     phi2=90.;
1286     theta2 = 90.;
1287     phi3 = (alpha>0) ? 0. : 180.;
1288     theta3 = TMath::Abs(alpha);
1289
1290     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1291
1292  
1293
1294     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1295     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1296
1297
1298     x1 -= 1.316295986;
1299     x2 -= 1.450914854;
1300
1301     alpha -= astep;   
1302     nRotMat++; 
1303
1304   }  
1305
1306   //--------------------------------------------------------------------------
1307   //  TPC Outer Readout Chambers
1308   //  this is NOT a final design
1309   //--------------------------------------------------------------------------
1310
1311   dm[0]= 23.3875;
1312   dm[1]= 43.524;
1313   dm[2]= 1.5; //thickness
1314   dm[3]= 57.1;
1315
1316   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1317
1318   //------------------------------------------------
1319   // Tpc Outer readout chamber Pad Plane
1320   //------------------------------------------------
1321
1322   dm[2]= 0.5;
1323
1324   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1325
1326   dm[0] -= 1.218511934;
1327   dm[1] -= 1.218511934;
1328   dm[2] = 0.35;
1329
1330   gMC->Gsvolu("TOC3","TRD1",idtmed[1],dm,4);
1331
1332   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1333
1334   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1335
1336   // empty space
1337
1338
1339   dm[0]= 21.035;
1340   dm[1]= 38.7205;
1341   dm[2]= 0.7; 
1342   dm[3]= 50.15;
1343
1344   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);  
1345
1346   dm[0]= 22.2935;
1347   dm[1]= 40.5085;
1348   dm[2]= 2.25;
1349   dm[3]= 51.65;
1350
1351   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1352
1353   dm[0]= 21.35;
1354   dm[1]= 38.7205;
1355   dm[2]= 2.25;
1356   dm[3]= 50.15;
1357
1358   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4); 
1359
1360
1361
1362   //-----------------------------------------------
1363   // Tpc Services Support Wheel
1364   //-----------------------------------------------
1365
1366   dm[0]=0.;
1367   dm[1]=360.;
1368   dm[2]=18.;
1369   dm[3]=2.;
1370
1371   dm[4]= -5.;
1372   dm[5]= 77.017;
1373   dm[6]= 255.267;
1374
1375   dm[7]= 5.;
1376   dm[8]= dm[5];
1377   dm[9]= dm[6];
1378
1379   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1380
1381   // Tpc Services Wheel Cover
1382
1383   dm[4]= -0.5;
1384   dm[7]= 0.5;
1385
1386   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1387
1388   // Tpc Service wheel Cover Empty space
1389    
1390   dm[0]= 10.99;
1391   dm[1]= 39.599;
1392   dm[2]= .5;
1393   dm[3]= 81.125;
1394
1395   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1396
1397   // Tpc services Wheel Empty Spaces
1398
1399   dm[0]= 13.18017507;
1400   dm[1]= 44.61045938;
1401   dm[2]= 4.;
1402   dm[3]= 89.125;
1403
1404   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1405
1406   // Tpc Services Wheel Bars
1407
1408   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1409
1410   // bars-> TWES
1411
1412   dm[2]= 4.;
1413   dm[3]= .4;
1414
1415   dm[0]= 13.8149522;
1416   dm[1]= 13.95601379;
1417   
1418   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1419
1420   dm[0]= 43.83462067; 
1421   dm[1]= 43.97568225;
1422
1423   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1424
1425   // TPc ELectronics - right now 30% X0 Si
1426
1427   dm[0]= 14.03813696;
1428   dm[1]= 43.3524075;
1429   dm[2]= 1.404;
1430   dm[3]= 83.125;
1431
1432   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1433   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1434
1435   //--------------------------------------------------------------------------
1436   //  End caps
1437   //--------------------------------------------------------------------------
1438
1439   // TPc Main Wheel - Al
1440
1441   dm[0]= 75.3;
1442   dm[1]= 264.8;
1443   dm[2]= 3.0;
1444
1445   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1446
1447   // TPc Extra Wheel (to avoid overlapping) - Al
1448
1449   dm[0]= 264.8;
1450   dm[1]= 277.0;
1451   dm[2]= 1.95;
1452
1453   gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1454
1455   //--------------------------------------------------------------------------
1456   //  Tpc Empty Space for the Readout chambers
1457   //--------------------------------------------------------------------------  
1458
1459   Float_t rLow= 86.2;
1460   Float_t rUp= 243.5;
1461   Float_t dR = 0.5*(rUp-rLow);
1462
1463   space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1464
1465   dm[0]= rLow*tanAlpha-space;
1466   dm[1]= rUp*tanAlpha-space;
1467   dm[2]= 3.0;
1468   dm[3]= dR;
1469
1470   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1471
1472   // TIC1->TESR
1473
1474
1475   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1476
1477
1478   // TOC1->TESR
1479
1480   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1481
1482   // Tpc Empty Space Bars - Al (daughters of TESR)
1483
1484   Float_t zBar;
1485
1486   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1487
1488   // lower bar
1489
1490   dm[0]= rLow*tanAlpha-space;
1491   dm[1]= 88.7*tanAlpha-space;
1492   dm[2]= 0.95;
1493   dm[3]= 1.275;
1494
1495   zBar = -dR+dm[3];
1496
1497   gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1498
1499   // middle bar
1500
1501   dm[0]= 131.65*tanAlpha-space;
1502   dm[1]= 136.5*tanAlpha-space;
1503   dm[3]= 2.425;
1504
1505   zBar = -dR +131.65+dm[3]-rLow;
1506
1507   gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1508
1509   // upper bar
1510
1511   dm[0]= 240.4*tanAlpha-space;
1512   dm[1]= rUp*tanAlpha-space;
1513   dm[3]= 1.55;
1514
1515   zBar = dR-dm[3];
1516
1517   gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1518
1519   //------------------------------------------------------
1520   //  TPc Lower "S" Sectors 
1521   //------------------------------------------------------
1522
1523
1524   Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow();
1525   Float_t inSecUpEdge =  fTPCParam->GetInnerRadiusUp();
1526
1527   dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1528   dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01;
1529   dm[2] = 0.5*(250. - 0.3);
1530   dm[3] = 0.5*(inSecUpEdge-inSecLowEdge);  
1531
1532   gMC->Gsvolu("TPLS", "TRD1", idtmed[2], dm, 4); // sensitive 
1533
1534   //----------------------------------------------------------
1535   //  TPc Upper Sectors
1536   //----------------------------------------------------------
1537
1538   Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow();
1539   Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp();
1540
1541   dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;  
1542   dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-0.01;  
1543   dm[2] = 0.5*(250. - 0.3);
1544   dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge);
1545
1546   gMC->Gsvolu("TPUS", "TRD1", idtmed[2], dm, 4); // sensitive
1547
1548
1549
1550
1551     gMC->Gsvolu("TPSS","TRD1",idtmed[2],dm,0); // sensitive
1552
1553     Int_t nofStrips,nstr;
1554     Float_t r1,r2,zs;
1555     Float_t stripThick = 0.01; // 100 microns
1556     Float_t deadSpace;
1557
1558     // inner sector
1559
1560
1561     // if all lower sectors selected define only 1 strip
1562
1563     nofStrips=((fSecAL <0)||(fSecAL>=0 && fSens<0)) ? 1 : fTPCParam->GetNRowLow(); 
1564     deadSpace = fTPCParam->GetInnerWireMount();
1565
1566     dm[2] = 0.5*(250. - 0.3);
1567     dm[3] = 0.5 * stripThick;  
1568
1569
1570     for(nstr=0;nstr<nofStrips;nstr++){
1571
1572       r1 = fTPCParam->GetPadRowRadiiLow(nstr);
1573       r2 = r1 + stripThick;     
1574       dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1575       dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - deadSpace;
1576       zs = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge);
1577       zs += r1;
1578       zs += dm[3];
1579     
1580       gMC->Gsposp("TPSS", nstr+1, "TPLS", 0., 0., zs, 0, "ONLY", dm, 4);
1581
1582
1583     }
1584
1585     // strips only if several upper sectors selected end fSens > 0
1586
1587     if(fSecAU >=0 && fSens >0){
1588
1589     Int_t nsSave = nofStrips;
1590
1591     // outer sector
1592
1593     nofStrips = fTPCParam->GetNRowUp();
1594     deadSpace = fTPCParam->GetOuterWireMount();
1595
1596     dm[2] = 0.5*(250. - 0.3);
1597     dm[3] = 0.5 * stripThick;
1598
1599   
1600     for(nstr=0;nstr<nofStrips;nstr++){
1601     
1602       r1 = fTPCParam->GetPadRowRadiiUp(nstr); 
1603       r2 = r1 + stripThick;
1604       dm[0] = r1 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1605       dm[1] = r2 * TMath::Tan(0.5*outerOpenAngle) - deadSpace;
1606       zs = -ouSecLowEdge -0.5*(ouSecUpEdge-ouSecLowEdge);
1607       zs += r1;
1608       zs += dm[3];
1609
1610       gMC->Gsposp("TPSS", nstr+1+nsSave, "TPUS", 0., 0., zs, 0, "ONLY", dm, 4);
1611
1612      }    
1613     }
1614
1615   //-------------------------------------------------------
1616   //  positioning of the empty spaces into the main wheel
1617   //  and readout chambers and sectors into the drift gas
1618   //-------------------------------------------------------
1619
1620   Float_t rCenter,xc,yc;
1621   Float_t rInner,rOuter; // center of the inner and outer chamber
1622
1623   rCenter = rLow+dR;
1624
1625   rInner = 108.07;
1626   rOuter = 190.68;
1627
1628   for(Int_t ns=0; ns<nInnerSector;ns++){
1629
1630     phi1 = ns * innerOpenAngle + innerAngleShift;
1631     phi1 *= kRaddeg; // in degrees
1632
1633     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1634
1635     if (phi1 > 360.) phi1 -= 360.;
1636
1637     theta1 = 90.;
1638     phi2   = 90.;
1639     theta2 = 180.;
1640     phi3   = ns * innerOpenAngle + innerAngleShift;
1641     phi3 *= kRaddeg; // in degrees
1642
1643     phi3 = (Float_t)TMath::Nint(phi3);
1644       
1645     if(phi3 > 360.) phi3 -= 360.;
1646
1647     theta3 = 90.;
1648
1649     // "holes"->End plate
1650
1651     xc = rCenter*TMath::Cos(phi3*kDegrad);
1652     yc = rCenter*TMath::Sin(phi3*kDegrad);
1653
1654     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1655
1656     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1657
1658     // TSCE->TSWC (services wheel volumes)
1659
1660     xc = 166.142*TMath::Cos(phi3*kDegrad);
1661     yc = 166.142*TMath::Sin(phi3*kDegrad);
1662
1663     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1664     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1665
1666     // readout chambers->TDGN (drift gas)
1667
1668     xc = rInner*TMath::Cos(phi3*kDegrad);
1669     yc = rInner*TMath::Sin(phi3*kDegrad);
1670
1671     gMC->Gspos("TIRC",ns+1,"TDGN",xc,yc,252.,idrotm[nRotMat],"ONLY");
1672
1673     // here lower sectors 
1674
1675     if(fSecAL <0){
1676
1677       // all lower sectors are positioned
1678
1679       gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1680       gMC->
1681         Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1682     }
1683     else{
1684
1685       // only selected sectors are positioned (up to 6 sectors)
1686
1687       for(Int_t sel=0;sel<6;sel++){
1688
1689         if(fSecLows[sel] == ns){
1690           gMC->Gspos("TPLS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1691         }
1692         else if(fSecLows[sel] == ns+nInnerSector){
1693          gMC->
1694           Gspos("TPLS",ns+nInnerSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1695         }
1696       }
1697     } // lower sectors finished
1698      
1699     xc = rOuter*TMath::Cos(phi3*kDegrad);
1700     yc = rOuter*TMath::Sin(phi3*kDegrad);
1701
1702     gMC->Gspos("TORC",ns+1,"TDGN",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1703
1704     // here upper sectors 
1705
1706     if(fSecAU <0){
1707
1708       // all upper sectors
1709
1710       gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1711       gMC->
1712         Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY");
1713     }
1714     else{
1715
1716       // only selected sectors (up to 12)
1717
1718       for(Int_t sel=0;sel<12;sel++){
1719         if(fSecUps[sel] == ns+2*nInnerSector){
1720           gMC->Gspos("TPUS",ns+1,"TDGN",xc,yc,125.15,idrotm[nRotMat],"ONLY");
1721         }         
1722         else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
1723          gMC->
1724           Gspos("TPUS",ns+nOuterSector+1,"TDGN",xc,yc,-125.15,idrotm[nRotMat],"ONLY"); 
1725         }
1726       }
1727     } // upper sectors finished
1728
1729     nRotMat++;
1730
1731     theta2 = 0.; // reflection, needed for readout chambers!
1732
1733     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1734
1735     xc = rInner*TMath::Cos(phi3*kDegrad);
1736     yc = rInner*TMath::Sin(phi3*kDegrad);
1737
1738     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGN",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1739
1740     xc = rOuter*TMath::Cos(phi3*kDegrad);
1741     yc = rOuter*TMath::Sin(phi3*kDegrad);
1742
1743     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGN",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1744
1745     nRotMat++;
1746
1747
1748   } 
1749
1750   // reflection matrix
1751
1752   theta1 = 90.;
1753   phi1   = 0.;
1754   theta2 = 90.;
1755   phi2   = 270.;
1756   theta3 = 180.;
1757   phi3   = 0.;
1758
1759   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1760
1761
1762   // TPMW->TPC
1763
1764   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1765   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1766   gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1767   gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1768
1769
1770
1771   //-------------------------------------------------------
1772   // Tpc High Voltage Membrane - NOMEX honeycomb
1773   //-------------------------------------------------------
1774
1775   dm[0]=0.,
1776   dm[1]=360.;
1777   dm[2]=18.;
1778   dm[3]=2.;
1779
1780   //
1781
1782   dm[4]= -0.3;
1783   dm[5]= 81.156;
1784   dm[6]= 253.386;
1785
1786   //
1787
1788   dm[7]= 0.3;
1789   dm[8]= dm[5];
1790   dm[9]= dm[6];
1791
1792   gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1793
1794   gMC->Gspos("THVM",1,"TDGN",0.,0.,0.,0,"ONLY");
1795
1796   //----------------------------------------------------------
1797   // TPc Support Rods - MAKROLON
1798   //----------------------------------------------------------
1799
1800   dm[0]= 0.9;
1801   dm[1]= 1.2;
1802   dm[2]= 126.65;
1803
1804   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1805
1806   for(Int_t nrod=1;nrod<18;nrod++){
1807     Float_t angle=innerOpenAngle*(Float_t)nrod;
1808
1809     xc=82.4*TMath::Cos(angle);
1810     yc=82.4*TMath::Sin(angle);
1811
1812     gMC->Gspos("TPSR",nrod,"TDGN",xc,yc,126.95,0,"ONLY");
1813     gMC->Gspos("TPSR",nrod+17,"TDGN",xc,yc,-126.95,0,"ONLY");
1814
1815     xc=254.2*TMath::Cos(angle);
1816     yc=254.2*TMath::Sin(angle);
1817
1818     gMC->Gspos("TPSR",nrod+34,"TDGN",xc,yc,126.95,0,"ONLY");
1819     gMC->Gspos("TPSR",nrod+51,"TDGN",xc,yc,-126.95,0,"ONLY");    
1820
1821   }
1822
1823   //----------------------------------------------------------
1824   // Tpc High Voltage rod - MAKROLON + Copper cable
1825   //----------------------------------------------------------
1826
1827   // rod with cable (Left)
1828
1829   dm[0]=0.;
1830   dm[1]=2.25;
1831   dm[2]=126.65;
1832
1833   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1834
1835   // HV cable
1836  
1837   dm[0]=0.;
1838   dm[1]=0.3;
1839   dm[2]=126.65;
1840
1841   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1842
1843   // empty space
1844
1845   dm[0]=0.3;
1846   dm[1]=1.;
1847   dm[2]=126.65;
1848
1849   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1850
1851   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1852   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1853
1854   // rod without cable
1855
1856   dm[0]=1.8;
1857   dm[1]=2.25;
1858   dm[2]=126.65;
1859
1860   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1861
1862   
1863   
1864   gMC->Gspos("THVL",1,"TDGN",82.4,0.,-126.95,0,"ONLY");
1865   gMC->Gspos("THVL",2,"TDGN",254.2,0.,-126.95,0,"ONLY");
1866
1867   gMC->Gspos("THVR",1,"TDGN",82.4,0.,126.95,0,"ONLY");
1868   gMC->Gspos("THVR",2,"TDGN",254.2,0.,126.95,0,"ONLY");  
1869   
1870
1871
1872   gMC->Gspos("TDGN",1,"TPC ",0.,0.,0.,0,"ONLY"); 
1873
1874   // services wheel cover -> wheel
1875
1876
1877   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1878   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1879
1880
1881   // put the wheel into the TPC
1882
1883   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1884   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1885
1886   gMC->Gsord("TPMW",6);
1887   if(fSecAL >=0)  gMC->Gsord("TPLS",3);
1888   if(fSecAU >=0 && fSens >0)  gMC->Gsord("TPUS",3);
1889   gMC->Gsord("TDGN",6);
1890   gMC->Gsord("TSSW",6);
1891   gMC->Gsord("TSWC",6);
1892
1893   // put the TPC into ALIC (main mother volume)
1894
1895   gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");  
1896
1897 } // end of function
1898  
1899 //_____________________________________________________________________________
1900 void AliTPCv2::DrawDetector()
1901 {
1902   //
1903   // Draw a shaded view of the Time Projection Chamber version 1
1904   //
1905
1906   // Set everything unseen
1907   gMC->Gsatt("*", "seen", -1);
1908   // 
1909   // Set ALIC mother transparent
1910   gMC->Gsatt("ALIC","SEEN",0);
1911   //
1912   // Set the volumes visible
1913   //
1914
1915   gMC->Gsatt("TPC ","SEEN",0);
1916   gMC->Gsatt("TOIN","SEEN",1);
1917   gMC->Gsatt("TOIN","COLO",7);
1918   gMC->Gsatt("TPCR","SEEN",0);
1919   gMC->Gsatt("TOCV","SEEN",1);
1920   gMC->Gsatt("TOCV","COLO",4);
1921   gMC->Gsatt("TSA1","SEEN",0);
1922   gMC->Gsatt("TSA2","SEEN",0);
1923   gMC->Gsatt("TSA3","SEEN",0);
1924   gMC->Gsatt("TSA4","SEEN",0);
1925   gMC->Gsatt("TOFC","SEEN",1);
1926   gMC->Gsatt("TOFC","COLO",4);
1927   gMC->Gsatt("TSA5","SEEN",0);
1928   gMC->Gsatt("TSA6","SEEN",0);
1929   gMC->Gsatt("TSA7","SEEN",0);
1930   gMC->Gsatt("TIIN","COLO",7);
1931   gMC->Gsatt("TIIN","SEEN",1);
1932   gMC->Gsatt("TICL","SEEN",0);
1933   gMC->Gsatt("TSA9","SEEN",0);
1934   gMC->Gsatt("TS10","SEEN",0);
1935   gMC->Gsatt("TS11","SEEN",0);
1936   gMC->Gsatt("TS12","SEEN",0);
1937   gMC->Gsatt("TICR","SEEN",0); 
1938   gMC->Gsatt("TS13","SEEN",0);
1939   gMC->Gsatt("TS14","SEEN",0);
1940   gMC->Gsatt("TS15","SEEN",0);
1941   gMC->Gsatt("TS16","SEEN",0);
1942   gMC->Gsatt("TIFC","SEEN",1);
1943   gMC->Gsatt("TIFC","COLO",4); 
1944   gMC->Gsatt("TS17","SEEN",0);
1945   gMC->Gsatt("TS18","SEEN",0);
1946   gMC->Gsatt("TS19","SEEN",0);
1947   gMC->Gsatt("TS21","SEEN",0);
1948   gMC->Gsatt("TS22","SEEN",0);
1949   gMC->Gsatt("TS23","SEEN",0);
1950   gMC->Gsatt("TS24","SEEN",0);
1951   gMC->Gsatt("TDGN","SEEN",0);
1952   gMC->Gsatt("TIRC","SEEN",0);
1953   gMC->Gsatt("TIC1","SEEN",1);
1954   gMC->Gsatt("TIPP","SEEN",0);
1955   gMC->Gsatt("TIC3","SEEN",0);
1956   gMC->Gsatt("TRCE","SEEN",0);
1957   gMC->Gsatt("TPSC","SEEN",0);
1958   gMC->Gsatt("TPCC","SEEN",0);
1959   gMC->Gsatt("TORC","SEEN",0);
1960   gMC->Gsatt("TOPP","SEEN",0);
1961   gMC->Gsatt("TOC3","SEEN",0);
1962   gMC->Gsatt("TOC1","SEEN",1);
1963   gMC->Gsatt("TSSW","SEEN",1);
1964   gMC->Gsatt("TSWC","SEEN",1);
1965   gMC->Gsatt("TSCE","SEEN",1); 
1966   gMC->Gsatt("TSSW","COLO",3);
1967   gMC->Gsatt("TSWC","COLO",3);
1968   gMC->Gsatt("TSCE","COLO",6);
1969   gMC->Gsatt("TWES","SEEN",0);
1970   gMC->Gsatt("TSWB","SEEN",0);
1971   gMC->Gsatt("TPEL","SEEN",0);
1972   gMC->Gsatt("TPMW","SEEN",1);
1973   gMC->Gsatt("TPEW","SEEN",1);
1974   gMC->Gsatt("TESR","SEEN",1);
1975   gMC->Gsatt("TPMW","COLO",12);
1976   gMC->Gsatt("TPEW","COLO",12);
1977   gMC->Gsatt("TWES","COLO",5);
1978   gMC->Gsatt("TIC1","COLO",5);
1979   gMC->Gsatt("TOC1","COLO",5);  
1980   gMC->Gsatt("TESB","SEEN",0);
1981   gMC->Gsatt("TPLS","SEEN",0);
1982   gMC->Gsatt("TPUS","SEEN",0);
1983   gMC->Gsatt("TPSS","SEEN",0);
1984   gMC->Gsatt("THVM","SEEN",1);
1985   gMC->Gsatt("THVM","COLO",11);
1986   gMC->Gsatt("TPSR","SEEN",0);
1987   gMC->Gsatt("THVL","SEEN",0);
1988   gMC->Gsatt("THVC","SEEN",0);
1989   gMC->Gsatt("THVE","SEEN",0);
1990   gMC->Gsatt("THVR","SEEN",0);
1991
1992   //
1993   gMC->Gdopt("hide", "on");
1994   gMC->Gdopt("shad", "on");
1995   gMC->Gsatt("*", "fill", 7);
1996   gMC->SetClipBox(".");
1997   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1998   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1999   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
2000   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
2001   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
2002   gMC->DefaultRange();
2003   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
2004   gMC->Gdhead(1111, "Time Projection Chamber");
2005   gMC->Gdman(18, 4, "MAN");
2006   gMC->Gdopt("hide","off");
2007 }
2008
2009 //_____________________________________________________________________________
2010 void AliTPCv2::CreateMaterials()
2011 {
2012   //
2013   // Define materials for version 2 of the Time Projection Chamber
2014   //
2015  
2016   AliTPC::CreateMaterials();
2017 }
2018
2019 //_____________________________________________________________________________
2020 void AliTPCv2::Init()
2021 {
2022   //
2023   // Initialises version 2 of the TPC after that it has been built
2024   //
2025
2026   Int_t *idtmed = fIdtmed->GetArray();
2027   
2028   AliTPC::Init();
2029
2030
2031   
2032   fIdSens=gMC->VolId("TPSS");  
2033
2034   fIdLSec=gMC->VolId("TPLS"); // lower sector 
2035   fIdUSec=gMC->VolId("TPUS"); // upper sector
2036
2037   gMC->SetMaxNStep(30000); // max. number of steps increased
2038
2039   gMC->Gstpar(idtmed[2],"LOSS",5); // specific energy loss
2040
2041   printf("*** TPC version 2 initialized ***\n");
2042   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
2043
2044   //
2045   
2046 }
2047
2048 //_____________________________________________________________________________
2049 void AliTPCv2::StepManager()
2050 {
2051   //
2052   // Called for every step in the Time Projection Chamber
2053   //
2054
2055   //
2056   // parameters used for the energy loss calculations
2057   //
2058   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
2059   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
2060   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
2061  
2062  
2063   const Float_t kbig = 1.e10;
2064
2065   Int_t id,copy;
2066   Float_t hits[4];
2067   Int_t vol[2];  
2068   TLorentzVector p;
2069   
2070   vol[1]=0; // preset row number to 0
2071
2072   //
2073
2074   gMC->SetMaxStep(kbig);
2075   
2076   if(!gMC->IsTrackAlive()) return; // particle has disappeared
2077   
2078   Float_t charge = gMC->TrackCharge();
2079   
2080   if(TMath::Abs(charge)<=0.) return; // take only charged particles
2081   
2082   // check the sensitive volume
2083
2084   id = gMC->CurrentVolID(copy); // current volume Id
2085
2086   if(id == fIdLSec){
2087     vol[0] = copy-1; // lower sector number
2088   }
2089   else if(id == fIdUSec){
2090     vol[0] = copy+fTPCParam->GetNInnerSector()-1; // upper sector number
2091   }
2092   else if(id == fIdSens && gMC->IsTrackEntering()){
2093  
2094     // track is entering the sensitive strip
2095     
2096     vol[1]= copy-1; // row number (absolute)
2097    
2098     // sector type
2099  
2100     id = gMC->CurrentVolOffID(1,copy);
2101
2102     if(id == fIdLSec){
2103
2104       // lower sector
2105      
2106       vol[0] = copy-1; // sector number
2107
2108     }
2109     else {
2110    
2111       // upper sector
2112
2113       vol[0] = copy-1+fTPCParam->GetNInnerSector(); // sector number
2114       vol[1] -= fTPCParam->GetNRowLow(); // row number (starts also from 0)  
2115
2116     } 
2117
2118     if(vol[1] == 0){
2119   
2120       // because Jouri wants to have this
2121
2122       gMC->TrackMomentum(p);
2123       hits[0]=p[0];
2124       hits[1]=p[1];
2125       hits[2]=p[2];
2126       hits[3]=0.; // this hit has no energy loss
2127       // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2128
2129       AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change
2130
2131     }
2132
2133      gMC->TrackPosition(p);
2134      hits[0]=p[0];
2135      hits[1]=p[1];
2136      hits[2]=p[2];
2137      hits[3]=0.; // this hit has no energy loss
2138      // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2139
2140      AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change    
2141
2142   }
2143   else return;
2144     
2145   //-----------------------------------------------------------------
2146   //  charged particle is in the sensitive volume
2147   //-----------------------------------------------------------------
2148   
2149   if(gMC->TrackStep() > 0) {
2150     
2151     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
2152     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
2153     
2154     gMC->TrackPosition(p);
2155     hits[0]=p[0];
2156     hits[1]=p[1];
2157     hits[2]=p[2];
2158     hits[3]=(Float_t)nel;
2159     
2160     // Add this hit
2161     
2162     // new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
2163     if (fHitType&&2){
2164       gMC->TrackMomentum(p);
2165       Float_t momentum = TMath::Sqrt(p[0]*p[0]+p[1]*p[1]);
2166       Float_t precision =   (momentum>0.1) ? 0.002 :0.01;
2167       fTrackHits->SetHitPrecision(precision);
2168     }
2169     AddHit(gAlice->CurrentTrack(), vol,hits);  //MI change 
2170     
2171   } 
2172   
2173   // Stemax calculation for the next step
2174   
2175   Float_t pp;
2176   TLorentzVector mom;
2177   gMC->TrackMomentum(mom);
2178   Float_t ptot=mom.Rho();
2179   Float_t betaGamma = ptot/gMC->TrackMass();
2180   
2181   Int_t pid=gMC->TrackPid();
2182   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
2183     { 
2184       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
2185     }
2186   else
2187     {
2188       pp=kprim*BetheBloch(betaGamma);    
2189       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
2190     }
2191   
2192   Float_t random[1];
2193   gMC->Rndm(random,1); // good, old GRNDM from Geant3
2194   
2195   Double_t rnd = (Double_t)random[0];
2196   
2197   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
2198   
2199 }
2200
2201 //_____________________________________________________________________________
2202 Float_t AliTPCv2::BetheBloch(Float_t bg)
2203 {
2204   //
2205   // Bethe-Bloch energy loss formula
2206   //
2207   const Double_t kp1=0.76176e-1;
2208   const Double_t kp2=10.632;
2209   const Double_t kp3=0.13279e-4;
2210   const Double_t kp4=1.8631;
2211   const Double_t kp5=1.9479;
2212
2213   Double_t dbg = (Double_t) bg;
2214
2215   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
2216
2217   Double_t aa = TMath::Power(beta,kp4);
2218   Double_t bb = TMath::Power(1./dbg,kp5);
2219
2220   bb=TMath::Log(kp3+bb);
2221   
2222   return ((Float_t)((kp2-aa-bb)*kp1/aa));
2223 }
2224
2225