Corrected bug in the TPC mother volume geometry.
[u/mrichter/AliRoot.git] / TPC / AliTPCv3.cxx
1 /**************************************************************************
2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
5  * Contributors are mentioned in the code where appropriate.              *
6  *                                                                        *
7  * Permission to use, copy, modify and distribute this software and its   *
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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 1.21  2000/11/30 11:48:50  kowal2
19 TLorentzVector.h adde to satisfy the latest changes by Federico
20
21 Revision 1.20  2000/11/14 10:48:57  kowal2
22 Correct material used for TSA4. Thanks to J. Barbosa.
23
24 Revision 1.19  2000/11/06 17:24:10  kowal2
25 Corrected bug in the outer containment vessel and
26 the outer field cage geometry.
27 Thanks to J. Barbosa.
28
29 Revision 1.18  2000/11/02 16:55:24  kowal2
30 Corrected bug in the inner containment vessel geometry.
31 Thanks to J. Belikov
32
33 Revision 1.17  2000/11/02 07:24:11  kowal2
34 Correction in the TPC geometry.
35 Changes due to the new hit structure.
36
37 Revision 1.16  2000/10/02 21:28:18  fca
38 Removal of useless dependecies via forward declarations
39
40 Revision 1.15  2000/07/10 20:57:39  hristov
41 Update of TPC code and macros by M.Kowalski
42
43 Revision 1.14  2000/06/30 12:07:50  kowal2
44 Updated from the TPC-PreRelease branch
45
46 Revision 1.13.2.4  2000/06/26 07:39:42  kowal2
47 Changes to obey the coding rules
48
49 Revision 1.13.2.3  2000/06/25 08:38:41  kowal2
50 Splitted from AliTPCtracking
51
52 Revision 1.13.2.2  2000/06/16 12:58:13  kowal2
53 Changed parameter settings
54
55 Revision 1.13.2.1  2000/06/09 07:15:07  kowal2
56
57 Defaults loaded automatically (hard-wired)
58 Optional parameters can be set via macro called in the constructor
59
60 Revision 1.13  2000/05/15 10:00:30  kowal2
61 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
62
63 Revision 1.12  2000/04/17 09:37:33  kowal2
64 removed obsolete AliTPCDigitsDisplay.C
65
66 Revision 1.11.8.2  2000/04/10 08:36:12  kowal2
67
68 Updated readout chambers
69 Some modifications to StepManager by M. Kowalski
70
71 Revision 1.11.8.1  2000/04/10 07:56:53  kowal2
72 Not used anymore - removed
73
74 Revision 1.11  1999/11/04 17:28:07  fca
75 Correct barrel part of HV Degrader
76
77 Revision 1.10  1999/10/14 16:52:08  fca
78 Only use PDG codes and not GEANT ones
79
80 Revision 1.9  1999/10/08 06:27:23  fca
81 Corrected bug in the HV degrader geometry, thanks to G.Tabary
82
83 Revision 1.8  1999/10/04 13:39:55  fca
84 Correct array index problem
85
86 Revision 1.7  1999/09/29 09:24:34  fca
87 Introduction of the Copyright and cvs Log
88
89 */
90
91 //
92 ///////////////////////////////////////////////////////////////////////////////
93 //                                                                           //
94 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
95 //                                                                     
96 //Begin_Html
97 /*
98 <img src="picts/AliTPCv3Class.gif">
99 */
100 //End_Html
101 //                                                                           //
102 //                                                                           //
103 ///////////////////////////////////////////////////////////////////////////////
104
105 #include <stdlib.h>
106 #include <TMath.h>
107 #include "AliTPCv3.h"
108 #include "AliRun.h"
109 #include "AliMC.h"
110 #include "AliConst.h"
111 #include "AliTPCDigitsArray.h"
112 #include"AliTPCParam.h"
113 #include"AliTPCParamSR.h"
114 #include "AliPDG.h"
115 #include <TInterpreter.h>
116 #include "TLorentzVector.h"
117
118 ClassImp(AliTPCv3)
119  
120 //_____________________________________________________________________________
121 AliTPCv3::AliTPCv3(const char *name, const char *title) :
122   AliTPC(name, title) 
123 {
124   //
125   // Standard constructor for Time Projection Chamber version 3
126   //
127
128   SetBufferSize(128000);
129   fIdSens=0;
130
131   SetGasMixt(2,20,10,-1,0.9,0.1,0.);
132
133   if (fTPCParam)
134      fTPCParam->Write(fTPCParam->GetTitle());
135 }
136  
137 //_____________________________________________________________________________
138 void AliTPCv3::CreateGeometry()
139 {
140   //
141   // Creation of the TPC coarse geometry (version 3)
142   // The whole drift volume is sensitive
143   // Origin Marek Kowalski Cracow
144   //
145   //Begin_Html
146   /*
147     <img src="picts/AliTPCgif">
148   */
149   //End_Html
150   //Begin_Html
151   /*
152     <img src="picts/AliTPCv3Tree.gif">
153   */
154   //End_Html
155   Float_t dm[50];
156
157   Int_t *idtmed = fIdtmed->GetArray(); // TPC media
158
159   Int_t idrotm[120]; // rotation matrices
160
161   Int_t nRotMat = 0; // actual number of rotation matrices
162
163
164   //
165   //  Mother volume (Air) - all volumes will be positioned in it
166   //
167   
168   dm[0]=0.;
169   dm[1]=360.;
170   dm[2]=12.;
171
172   //
173  
174   dm[3]= -283.7;
175   dm[4]= 66.2;
176   dm[5]= 277.95;
177
178   //
179
180   dm[6]= -255.6;
181   dm[7]= 66.2;
182   dm[8]= 277.95;
183
184   //
185
186   dm[9]= -73.3;
187   dm[10]= 59.0;
188   dm[11]= 277.95;
189
190   //
191
192   dm[12]= -73.3;
193   dm[13]= 56.9;
194   dm[14]= 277.95;
195
196   //
197
198   dm[15]= -72.1;
199   dm[16]= 56.9;
200   dm[17]= 277.95;
201
202   //
203
204   dm[18]= -72.1;
205   dm[19]= 60.65;
206   dm[20]= 277.95;
207
208   //
209
210   dm[21]= 72.1;
211   dm[22]= 60.65;
212   dm[23]= 277.95;  
213
214   //
215
216   dm[24]= 72.1;
217   dm[25]= 56.9;
218   dm[26]= 277.95;
219
220   //
221
222   dm[27]= 73.3;
223   dm[28]= 56.9;
224   dm[29]= 277.95;
225
226   //
227
228   dm[30]= 73.3;
229   dm[31]= 59.;
230   dm[32]= 277.95;
231
232   //
233
234   dm[33]= 250.4;
235   dm[34]= 66.0;
236   dm[35]= 277.95;
237
238   //
239
240   dm[36]= 283.7;
241   dm[37]= 66.0;
242   dm[38]= 277.95;
243
244
245   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
246
247
248   //-------------------------------------------------------------------
249   //  Tpc Outer INsulator (CO2)
250   //-------------------------------------------------------------------
251
252   dm[0]= 0.;
253   dm[1]= 360.;
254   dm[2]= 6.;
255
256   //
257  
258   dm[3]= -253.6;
259   dm[4]= 258.;
260   dm[5]= 266.65;
261
262   //
263
264   dm[6]= -253.;
265   dm[7]= 258.;
266   dm[8]= 266.65;
267
268   dm[9]= -253.;
269   dm[10]= 258.;
270   dm[11]= 277.97;
271
272   dm[12]= 253.6;
273   dm[13]= 258.;
274   dm[14]= 277.97;
275
276   //
277
278   dm[15]= 253.6;
279   dm[16]= 265.2;
280   dm[17]= 277.95;
281
282   //
283
284   dm[18]= 255.6;
285   dm[19]= 265.2;
286   dm[20]= 277.95;
287
288
289   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
290
291   //---------------------------------------------------------------
292   // shreds (G10) - TPC Rings
293   //---------------------------------------------------------------
294
295   gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
296
297   dm[0]= 258.;
298   dm[1]= 266.65;
299   dm[2]= 0.3;
300
301   gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
302
303   //
304
305   dm[0]= 258.;
306   dm[1]= 270.9;
307   dm[2]= 0.3;
308
309   gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
310
311   //
312
313   dm[0]= 272.2;
314   dm[1]= 277.95;
315   dm[2]= 0.3;
316
317   gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
318
319   //----------------------------------------------------------------
320   // Tpc Outer Contaiment Vessel  
321   //  mother volume - Al, daughters - composite (sandwich)
322   //----------------------------------------------------------------
323   
324   dm[0]= 0.;
325   dm[1]= 360.;
326   dm[2]=6.;
327
328   //
329
330   dm[3]= -250.4;
331   dm[4]= 272.2;
332   dm[5]= 277.95;
333
334   //
335
336   dm[6]= -248.4;
337   dm[7]= 272.2;
338   dm[8]= 277.95;
339
340   //
341
342   dm[9]= -248.4;
343   dm[10]= 274.81;
344   dm[11]= 277.95;
345
346   //
347
348   dm[12]= 253.6;
349   dm[13]= 274.81;
350   dm[14]= 277.95;
351
352   //
353
354   dm[15]= 253.6;
355   dm[16]= 265.2;
356   dm[17]= 277.95;
357
358   // 
359
360   dm[18]= 255.6;
361   dm[19]= 265.2;
362   dm[20]= 277.95;
363
364   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,21);
365
366   // Daughter volumes
367
368   // Tpc SAndwich 1 - Al
369  
370   dm[0]= 274.81;
371   dm[1]= 277.95;
372   dm[2]= 251.7;
373
374   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
375
376   // Tpc SAndwich 2 - Tedlar
377
378   dm[0] += 5.e-3;
379   dm[1] -= 5.e-3;
380   
381   gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
382
383   // Tpc SAndwich 3 - Kevlar
384
385   dm[0] += 5e-3;
386   dm[1] -= 5.e-3;
387
388   gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
389
390   // Tpc SAndwich 4 - NOMEX honeycomb
391
392   dm[0] += 0.06;
393   dm[1] -= 0.06;
394
395   gMC->Gsvolu("TSA4","TUBE",idtmed[6],dm,3);  
396   
397   // 4->3->2->1->TOCV
398
399   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
400   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
401   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
402
403   gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
404
405   // TCOV-> TOIN
406
407   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
408
409   //-------------------------------------------------------
410   //  Tpc Outer Field Cage
411   //  mother volume - Al, daughters - composite (sandwich)
412   //-------------------------------------------------------
413
414   dm[0]=0.;
415   dm[1]=360.;
416   dm[2]=6.;
417
418   dm[3]= -253.;
419   dm[4]= 258.;
420   dm[5]= 277.95;
421
422   //
423
424   dm[6]= -251.;
425   dm[7]= 258.;
426   dm[8]= 277.95;
427
428   //
429  
430   dm[9]= -251.;
431   dm[10]= 258.;
432   dm[11]= 260.05;
433
434   //
435
436   dm[12]= 251.;
437   dm[13]= 258.;
438   dm[14]= 260.05;
439
440   //
441
442   dm[15]= 251.;
443   dm[16]= 258.;
444   dm[17]= 270.9;
445
446   //
447
448   dm[18]= 253.;
449   dm[19]= 258.;
450   dm[20]= 270.9;
451
452   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);  
453
454   // Daughter volumes 
455
456   // Tpc SAndwich 5 - Tedlar
457
458   dm[0]= 258.;
459   dm[1]= 260.05;
460   dm[2]= 251.7;
461
462   gMC->Gsvolu("TSA5","TUBE",idtmed[9],dm,3);
463
464   // Tpc SAndwich 6 - Kevlar
465
466   dm[0] += 5.e-3;
467   dm[1] -= 5.e-3;
468
469   gMC->Gsvolu("TSA6","TUBE",idtmed[5],dm,3);
470
471
472   // Tpc SAndwich 7 - NOMEX
473
474   dm[0] += 0.02;
475   dm[1] -= 0.02;
476
477   gMC->Gsvolu("TSA7","TUBE",idtmed[6],dm,3);    
478
479   // 7->6->5->TOFC
480
481   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
482   gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY"); 
483
484   gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
485
486   // TOFC->TOIN
487
488   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY"); 
489
490   // TOIN->TPC
491
492   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
493
494   //--------------------------------------------------------------------
495   // Tpc Inner INsulator (CO2)
496   //--------------------------------------------------------------------
497
498
499   dm[0]=0.;
500   dm[1]= 360.;
501   dm[2]= 15.;
502
503   //
504
505   dm[3]= -255.6;
506   dm[4]= 66.2;
507   dm[5]= 74.8;
508
509   //
510
511   Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
512
513   dm[6]= -253.6;
514   dm[7]= 59.0+ (253.6-73.3)*tanL;
515   dm[8]= 74.8;
516
517   //
518
519   dm[9]= -253.6;
520   dm[10]= dm[7];
521   dm[11]= 79.2;
522
523   //
524
525   dm[12]= -73.3;
526   dm[13]= 59.0;
527   dm[14]= 79.2;
528
529   //
530
531   dm[15]= -73.3;
532   dm[16]= 56.9;
533   dm[17]= 79.2;
534
535   //
536
537   dm[18]= -72.1;
538   dm[19]= 59.6;
539   dm[20]= 79.2;
540
541   //
542
543   dm[21]= -72.1;
544   dm[22]= 60.65;
545   dm[23]= 79.2;
546
547   //
548
549   dm[24]= 72.1;
550   dm[25]= 60.65;
551   dm[26]= 79.2;  
552
553   //
554
555   dm[27]= 72.1;
556   dm[28]= 59.6;
557   dm[29]= 79.2;
558
559   //
560
561   dm[30]= 73.3;
562   dm[31]= 56.9;
563   dm[32]= 79.2;
564
565   //
566
567   dm[33]= 73.3;
568   dm[34]= 59.0;
569   dm[35]= 79.2;
570
571   //
572
573   dm[36]= 250.4;
574   dm[37]= 66.0;
575   dm[38]= 79.2;
576
577   //
578   
579   dm[39]= 253.0;
580   dm[40]= 66.0;
581   dm[41]= 79.2;
582
583   //
584
585   dm[42]= 253.0;
586   dm[43]= 75.3;
587   dm[44]= 79.2;
588
589   //
590
591   dm[45]= 253.6;
592   dm[46]= 75.3;
593   dm[47]= 79.2;
594
595   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
596
597
598   //--------------------------------------------------------------------
599   //  Tpc Inner Containment vessel, Left part
600   //  mother volume - Al, daughter - composite (sandwich)
601   //--------------------------------------------------------------------
602
603   dm[0]= 0.;
604   dm[1]= 360.;
605   dm[2]= 8.;
606
607   //
608
609   dm[3]= -255.6;
610   dm[4]= 66.2;
611   dm[5]= 74.8;
612
613   //
614
615   Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
616   Float_t sandThick = 2.14; // cone composite thickness
617
618
619   //
620
621   dm[6]= -253.6;
622   dm[7]= 59.0 + (253.6-73.3)*tanL;
623   dm[8]= 74.8;
624
625   //
626
627   dm[9]= -253.6;
628   dm[10]= dm[7];
629   dm[11]= dm[7]+sandThick/cosL;
630
631   //
632
633   dm[12]= -75.6;
634   dm[13]= 59.0+(75.6-73.3)*tanL;
635   dm[14]= dm[13]+sandThick/cosL;
636
637   //
638
639   dm[15]= -75.6;
640   dm[16]= dm[13];
641   dm[17]= 60.65;
642
643   //
644
645   dm[18]= -73.3;
646   dm[19]= 59.0;
647   dm[20]= 60.65;
648
649   //
650
651   dm[21]= -73.3;
652   dm[22]= 56.9;
653   dm[23]= 60.65;
654
655   //
656
657   dm[24]= -72.1;
658   dm[25]= 56.9;
659   dm[26]= 60.65;
660
661   gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
662
663   // Daughter volumes 
664
665   // Tpc SAndwich 9 - Al
666
667   dm[0]= 0.;
668   dm[1]= 360.;
669   dm[2]= 2.;
670
671   //
672
673   dm[3]= - 254.3;
674   dm[4]= 59.0+(254.3-73.3)*tanL;
675   dm[5]= dm[4]+sandThick/cosL;
676
677   //
678
679   dm[6]= -78.3;
680   dm[7]= 59.0+(78.3-73.3)*tanL;
681   dm[8]= dm[7]+sandThick/cosL;
682
683   //
684
685   gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
686
687   // Tpc SAndwich 10 - Tedlar
688
689   dm[4]+= 5.e-3/cosL;
690   dm[5]-= 5.e-3/cosL;
691
692   //
693
694   dm[7]+= 5.e-3/cosL;
695   dm[8]+= 5.e-3/cosL;
696
697   gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9); 
698
699   // Tpc SAndwich 11 - Kevlar
700
701   dm[4]+= 5.e-3/cosL;
702   dm[5]-= 5.e-3/cosL;
703
704   //
705
706   dm[7]+= 5.e-3/cosL;
707   dm[8]+= 5.e-3/cosL;
708
709   gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9); 
710
711   // Tpc SAndwich 12 - NOMEX
712
713   dm[4]+= 0.06/cosL;
714   dm[5]-= 0.06/cosL;
715
716   //
717
718   dm[7]+= 0.06/cosL;
719   dm[8]+= 0.06/cosL;
720
721   gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);   
722
723   // 12->11->10->9
724
725   gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
726   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
727   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
728
729   // TSA9->TICL
730
731   gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
732  
733   //--------------------------------------------------------------------
734   //  Tpc Inner Containment vessel, Right part
735   //  mother volume - Al, daughter - composite (sandwich)
736   //--------------------------------------------------------------------
737
738   dm[0]= 0.;
739   dm[1]= 360.;
740   dm[2]=8.;
741
742   //
743
744   dm[3]= 72.1;
745   dm[4]= 56.9;
746   dm[5]= 60.65;
747
748   //
749
750   dm[6]= 73.3;
751   dm[7]= 56.9;
752   dm[8]= 60.65;
753
754   //
755
756   dm[9]= 73.3;
757   dm[10]= 59.0;
758   dm[11]= 60.65;
759
760   //
761
762   Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
763   Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
764
765   //
766
767   dm[12]= 75.6;
768   dm[13]= 59.0+(75.6-73.3)*tanR;
769   dm[14]= 60.65;
770
771   //
772
773   dm[15]= 75.6;
774   dm[16]= dm[13];
775   dm[17]= dm[16]+sandThick/cosR;
776
777   //
778
779   dm[18]= 248.4;
780   dm[19]= 59.0+(248.4-73.3)*tanR;
781   dm[20]= dm[19]+sandThick/cosR;
782
783   //
784
785   dm[21]= 248.4;
786   dm[22]= dm[19];
787   dm[23]= 70.2;
788
789   //
790
791   dm[24]= 250.4;
792   dm[25]= 66.0;
793   dm[26]= 70.2;
794
795   gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
796
797
798
799   // Daughter volumes 
800
801   // Tpc SAndwich 13 - Al
802
803   dm[0]= 0.;
804   dm[1]= 360.;
805   dm[2]= 2.;
806
807   //
808
809   dm[3]= 78.3;
810   dm[4]= 59.0+(78.3-73.3)*tanR;
811   dm[5]= dm[4]+sandThick/cosR;
812
813   //
814
815   dm[6]= 249.1;
816   dm[7]= 59.0+(249.1-73.3)*tanR;
817   dm[8]= dm[7]+sandThick/cosR;
818
819   //
820
821   gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
822
823   // Tpc SAndwich 14 - Tedlar
824
825   dm[4]+= 5.e-3/cosR;
826   dm[5]-= 5.e-3/cosR;
827
828   //
829
830   dm[7]+= 5.e-3/cosR;
831   dm[8]+= 5.e-3/cosR;
832
833   gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9); 
834
835   // Tpc SAndwich 15 - Kevlar
836
837   dm[4]+= 5.e-3/cosR;
838   dm[5]-= 5.e-3/cosR;
839
840   //
841
842   dm[7]+= 5.e-3/cosR;
843   dm[8]+= 5.e-3/cosR;
844
845   gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9); 
846
847   // Tpc SAndwich 16 - NOMEX
848
849   dm[4]+= 0.06/cosR;
850   dm[5]-= 0.06/cosR;
851
852   //
853
854   dm[7]+= 0.06/cosR;
855   dm[8]+= 0.06/cosR;
856
857   gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);   
858
859   // 16->15->14->13
860
861   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
862   gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
863   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
864
865   // TS12->TICR
866
867   gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
868
869   //------------------------------------------------------
870   // Tpc Inner Field Cage
871   // mother volume - Al, daughters - composite (sandwich)
872   //------------------------------------------------------
873
874   dm[0]= 0.;
875   dm[1]= 360.;
876   dm[2]=6.;
877
878   //
879
880   dm[3]= -253.0;
881   dm[4]= 70.7;
882   dm[5]= 79.2;
883
884   //
885
886   dm[6]= -251.0;
887   dm[7]= 70.7;
888   dm[8]= 79.2;
889
890   //
891
892   dm[9]= -251.0;
893   dm[10]= 77.15;
894   dm[11]= 79.2;
895
896   //
897   
898   dm[12]= 251.0;
899   dm[13]= 77.15;
900   dm[14]= 79.2;
901
902   //
903
904   dm[15]= 251.0;
905   dm[16]= 66.0;
906   dm[17]= 79.2;
907
908   //
909
910   dm[18]= 253.0;
911   dm[19]= 66.0;
912   dm[20]= 79.2;
913
914   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
915
916   // Daughter volumes
917
918   // Tpc Sandwich 17 - Tedlar
919
920   dm[0]= 77.15;
921   dm[1]= 79.2;
922   dm[2]= 251.7;
923
924   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
925
926   // Tpc Sandwich 18 - Kevlar
927
928   dm[0]+= 5.e-3;
929   dm[1]-= 5.e-3;
930
931   gMC->Gsvolu("TS18","TUBE",idtmed[5],dm,3);
932
933
934   // Tpc Sandwich 19 - NOMEX
935
936   dm[0]+= 0.02;
937   dm[1]-= 0.02;
938
939   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
940
941   // 19->18->17
942
943   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
944   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
945
946   // TS17->TIFC
947
948   gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
949
950   // TPC Rings
951
952   dm[0]= 70.7;
953   dm[1]= 79.2;
954   dm[2]= 0.3;
955
956   gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
957
958   dm[0]= 66.0;
959   dm[1]= 70.2;  
960
961   gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
962
963   dm[0]= 75.3;
964   dm[1]= 79.2;  
965
966   gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);  
967
968   // TICL->TIIN
969
970   gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
971
972   // TICR->TIIN
973
974   gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
975
976   // TIFC->TIIN
977
978   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
979
980   // Tpc Sandwich 21 - Al (central barrel)
981
982   dm[0]= 60.65;
983   dm[1]= 61.21;
984   dm[2]= 75.2;
985
986   gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
987
988   // Tpc Sandwich 22 - Tedlar (central barrel) 
989
990   dm[0]+= 5.e-3;
991   dm[1]-= 5.e-3;
992
993   gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3); 
994
995   // Tpc Sandwich 23 - Kevlar (central barrel) 
996
997   dm[0]+= 5.e-3;
998   dm[1]-= 5.e-3;
999
1000   gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3); 
1001
1002   // Tpc Sandwich 24 - NOMEX (central barrel) 
1003
1004   dm[0]+= 0.02;
1005   dm[1]-= 0.02;
1006
1007   gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3); 
1008
1009   // 24->23->22->21
1010
1011   gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
1012   gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
1013   gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
1014
1015   gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
1016
1017   // put everything into the TPC 
1018
1019   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
1020
1021
1022   //---------------------------------------------------------
1023   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1024   //  and its daughters (HV membrane, rods, readout chambers)
1025   //---------------------------------------------------------
1026
1027   dm[0]= 79.2;
1028   dm[1]= 258.0;
1029   dm[2]= 253.6;
1030
1031   gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);  
1032
1033   // sector opening angles
1034
1035   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1036
1037   // sector angle shift
1038
1039   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1040
1041   // number of sectors
1042
1043   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
1044   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
1045
1046   // All above parameters are identical for inner and outer
1047   // sectors. The distinction is kept for the historical reasons
1048   // and eventually will disappear.
1049
1050   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1051   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1052   Float_t space;
1053
1054   //-------------------------------------------------------------------------
1055   //   Tpc Inner Readout Chambers 
1056   //-------------------------------------------------------------------------
1057
1058   dm[0]= 14.483;
1059   dm[1]= 23.3345; 
1060   dm[2]= 1.6; // thickness
1061   dm[3]= 25.1;
1062
1063   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1064
1065   // this volume will be positioned in the empty space
1066   // of the end-cap to avoid overlaps
1067
1068   dm[0]= 13.7305;
1069   dm[1]= 21.1895;
1070   dm[2]= 2.25;
1071   dm[3]= 21.15;
1072
1073   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1074
1075
1076   //------------------------------------------------
1077   // Tpc Inner readout chamber Pad Plane
1078   //------------------------------------------------
1079
1080   dm[0]= 14.483;
1081   dm[1]= 23.3345;
1082   dm[2]= 0.5;
1083   dm[3]= 25.1;
1084
1085   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1086
1087   // 
1088
1089   dm[0] -= 1.218511934;
1090   dm[1] -= 1.218511934;
1091   dm[2] = 0.35;
1092
1093   gMC->Gsvolu("TIC3","TRD1",idtmed[2],dm,4);
1094
1095   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1096
1097   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1098
1099
1100   //----------------------------------------------
1101   // Tpc Readout Chambers Empty spaces - for both
1102   // inner and outer sectors
1103   //----------------------------------------------
1104
1105   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1106
1107   // Inner sector - 4 spaces
1108
1109
1110   dm[3] = 4.7625;
1111   dm[0] = 12.472;
1112
1113   Float_t rr = 90.52;
1114   Float_t zz;
1115
1116   zz= -12.7875;
1117   
1118   space = rr*tanAlpha-dm[0];
1119
1120   for(Int_t nsLow=0;nsLow<4;nsLow++){
1121
1122     rr += 9.525;
1123     dm[1]= rr*tanAlpha - space;  
1124
1125     dm[2]=0.8;
1126
1127     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1128
1129     //
1130
1131     dm[2]= 1.2;
1132
1133     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1134
1135     rr += 0.4;
1136     dm[0] = rr*tanAlpha - space;
1137     zz += (0.4+9.525); 
1138
1139   }
1140
1141   dm[0]= 12.472;
1142   // dm[1] - this is the dm[1] from the previous TRCE
1143   dm[2]= 1.05;
1144   dm[3]= 19.65;
1145
1146   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.,0.,0,"ONLY",dm,4);   
1147
1148   //
1149   // TPc Space for Connectors
1150   //
1151
1152   dm[0]= .3;
1153   dm[1]= .3;
1154   dm[2]= 4.5;
1155
1156   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1157
1158   // TPC Connectors
1159
1160   dm[0]= .25;
1161   dm[1]= .15;
1162   dm[2]= 3.75;
1163
1164   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3); 
1165
1166   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1167
1168   zz = -12.7875;
1169
1170
1171   Float_t alpha;
1172   Float_t astep;
1173
1174   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1175
1176   // inner part of the inner sector - 2 x 20 holes
1177   
1178   astep = 20.00096874/19.;
1179
1180   alpha = 10.00048437-astep;
1181
1182   Float_t x1,x2;
1183
1184     x1 = 13.31175725;
1185     x1 -= 0.996357832; 
1186
1187     x2 = 15.06180253;
1188     x2 -= 1.163028812;
1189
1190   Int_t ncon;
1191
1192   for(ncon=0;ncon<20;ncon++){
1193
1194     phi1 = 0.;
1195     theta1 = 90.+alpha;
1196     phi2=90.;
1197     theta2 = 90.;
1198     phi3 = (alpha>0) ? 0. : 180.;
1199     theta3 = TMath::Abs(alpha);
1200
1201     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1202
1203  
1204
1205     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1206     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1207
1208
1209     x1 -= 1.296357833;
1210     x2 -= 1.463028812;
1211
1212     alpha -= astep;   
1213     nRotMat++; 
1214
1215   }
1216
1217   // outer part of the inner sector - 2 x 25 holes
1218
1219    astep = 20.00096874/24.; 
1220    alpha = 10.00048437-astep;
1221
1222    x1 = 16.81184781;
1223    x1 -= 1.016295986;
1224
1225    x2 = 18.5618931;
1226    x2 -= 1.150914854;
1227
1228   for(ncon=0;ncon<25;ncon++){
1229
1230     phi1 = 0.;
1231     theta1 = 90.+alpha;
1232     phi2=90.;
1233     theta2 = 90.;
1234     phi3 = (alpha>0) ? 0. : 180.;
1235     theta3 = TMath::Abs(alpha);
1236
1237     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1238
1239  
1240
1241     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1242     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1243
1244
1245     x1 -= 1.316295986;
1246     x2 -= 1.450914854;
1247
1248     alpha -= astep;   
1249     nRotMat++; 
1250
1251   }  
1252
1253   //--------------------------------------------------------------------------
1254   //  TPC Outer Readout Chambers
1255   //  this is NOT a final design
1256   //--------------------------------------------------------------------------
1257
1258   dm[0]= 23.3875;
1259   dm[1]= 43.524;
1260   dm[2]= 1.5; //thickness
1261   dm[3]= 57.1;
1262
1263   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1264
1265   //------------------------------------------------
1266   // Tpc Outerr readout chamber Pad Plane
1267   //------------------------------------------------
1268
1269   dm[2]= 0.5;
1270
1271   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1272
1273   dm[0] -= 1.218511934;
1274   dm[1] -= 1.218511934;
1275   dm[2] = 0.35;
1276
1277   gMC->Gsvolu("TOC3","TRD1",idtmed[2],dm,4);
1278
1279   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1280
1281   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1282
1283   // empty space
1284
1285
1286   dm[0]= 21.035;
1287   dm[1]= 38.7205;
1288   dm[2]= 0.7; 
1289   dm[3]= 50.15;
1290
1291   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);  
1292
1293   dm[0]= 22.2935;
1294   dm[1]= 40.5085;
1295   dm[2]= 2.25;
1296   dm[3]= 51.65;
1297
1298   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1299
1300
1301   dm[0]= 21.35;
1302   dm[1]= 38.7205;
1303   dm[2]= 2.25;
1304   dm[3]= 50.15;
1305
1306   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4); 
1307
1308
1309   //-----------------------------------------------
1310   // Tpc Services Support Wheel
1311   //-----------------------------------------------
1312
1313   dm[0]=0.;
1314   dm[1]=360.;
1315   dm[2]=18.;
1316   dm[3]=2.;
1317
1318   dm[4]= -5.;
1319   dm[5]= 77.017;
1320   dm[6]= 255.267;
1321
1322   dm[7]= 5.;
1323   dm[8]= dm[5];
1324   dm[9]= dm[6];
1325
1326   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1327
1328   // Tpc Services Wheel Cover
1329
1330   dm[4]= -0.5;
1331   dm[7]= 0.5;
1332
1333   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1334
1335   // Tpc Service wheel Cover Empty space
1336    
1337   dm[0]= 10.99;
1338   dm[1]= 39.599;
1339   dm[2]= .5;
1340   dm[3]= 81.125;
1341
1342   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1343
1344   // Tpc services Wheel Empty Spaces
1345
1346   dm[0]= 13.18017507;
1347   dm[1]= 44.61045938;
1348   dm[2]= 4.;
1349   dm[3]= 89.125;
1350
1351   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1352
1353   // Tpc Services Wheel Bars
1354
1355   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1356
1357   // bars-> TWES
1358
1359   dm[2]= 4.;
1360   dm[3]= .4;
1361
1362   dm[0]= 13.8149522;
1363   dm[1]= 13.95601379;
1364   
1365   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1366
1367   dm[0]= 43.83462067; 
1368   dm[1]= 43.97568225;
1369
1370   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1371
1372   // TPc ELectronics - right now 30% X0 Si
1373
1374   dm[0]= 14.03813696;
1375   dm[1]= 43.3524075;
1376   dm[2]= 1.404;
1377   dm[3]= 83.125;
1378
1379   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1380   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1381
1382
1383   //--------------------------------------------------------------------------
1384   //  End caps
1385   //--------------------------------------------------------------------------
1386
1387   // TPc Main Wheel - Al
1388
1389   dm[0]= 75.3;
1390   dm[1]= 264.8;
1391   dm[2]= 3.0;
1392
1393   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1394
1395   // TPc Extra Wheel (to avoid overlapping) - Al
1396
1397   dm[0]= 264.8;
1398   dm[1]= 277.0;
1399   dm[2]= 1.95;
1400
1401   gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1402
1403   //--------------------------------------------------------------------------
1404   //  Tpc Empty Space for the Readout chambers
1405   //--------------------------------------------------------------------------  
1406
1407   Float_t rLow= 86.2;
1408   Float_t rUp= 243.5;
1409   Float_t dR = 0.5*(rUp-rLow);
1410
1411   space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1412
1413   dm[0]= rLow*tanAlpha-space;
1414   dm[1]= rUp*tanAlpha-space;
1415   dm[2]= 3.0;
1416   dm[3]= dR;
1417
1418   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1419
1420   // TIC1->TESR
1421
1422
1423   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1424
1425
1426   // TOC1->TESR
1427
1428   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1429
1430   // Tpc Empty Space Bars - Al (daughters of TESR)
1431
1432   Float_t zBar;
1433
1434   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1435
1436   // lower bar
1437
1438   dm[0]= rLow*tanAlpha-space;
1439   dm[1]= 88.7*tanAlpha-space;
1440   dm[2]= 0.95;
1441   dm[3]= 1.275;
1442
1443   zBar = -dR+dm[3];
1444
1445   gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1446
1447   // middle bar
1448
1449   dm[0]= 131.65*tanAlpha-space;
1450   dm[1]= 136.5*tanAlpha-space;
1451   dm[3]= 2.425;
1452
1453   zBar = -dR +131.65+dm[3]-rLow;
1454
1455   gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1456
1457   // upper bar
1458
1459   dm[0]= 240.4*tanAlpha-space;
1460   dm[1]= rUp*tanAlpha-space;
1461   dm[3]= 1.55;
1462
1463   zBar = dR-dm[3];
1464
1465   gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1466
1467   //  positioning of the empty spaces into the main wheel
1468
1469   Float_t rCenter,xc,yc;
1470   Float_t rInner,rOuter; // center of the inner and outer chamber
1471
1472   rCenter = rLow+dR;
1473
1474   rInner = 108.07;
1475   rOuter = 190.68;
1476
1477   for(Int_t ns=0; ns<nInnerSector;ns++){
1478
1479     phi1 = ns * innerOpenAngle + innerAngleShift;
1480     phi1 *= kRaddeg; // in degrees
1481
1482     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1483
1484     if (phi1 > 360.) phi1 -= 360.;
1485
1486     theta1 = 90.;
1487     phi2   = 90.;
1488     theta2 = 180.;
1489     phi3   = ns * innerOpenAngle + innerAngleShift;
1490     phi3 *= kRaddeg; // in degrees
1491
1492     phi3 = (Float_t)TMath::Nint(phi3);
1493       
1494     if(phi3 > 360.) phi3 -= 360.;
1495
1496     theta3 = 90.;
1497
1498     // "holes"->End plate
1499
1500     xc = rCenter*TMath::Cos(phi3*kDegrad);
1501     yc = rCenter*TMath::Sin(phi3*kDegrad);
1502
1503     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1504
1505     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1506
1507     // TSCE->TSWC (services wheel volumes)
1508
1509     xc = 166.142*TMath::Cos(phi3*kDegrad);
1510     yc = 166.142*TMath::Sin(phi3*kDegrad);
1511
1512     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1513     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1514
1515
1516     // readout chambers->TDGS (drift gas)
1517
1518     xc = rInner*TMath::Cos(phi3*kDegrad);
1519     yc = rInner*TMath::Sin(phi3*kDegrad);
1520
1521     gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1522      
1523     xc = rOuter*TMath::Cos(phi3*kDegrad);
1524     yc = rOuter*TMath::Sin(phi3*kDegrad);
1525
1526     gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1527
1528     nRotMat++;
1529
1530     theta2 = 0.; // reflection
1531
1532     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1533
1534     xc = rInner*TMath::Cos(phi3*kDegrad);
1535     yc = rInner*TMath::Sin(phi3*kDegrad);
1536
1537     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1538
1539     xc = rOuter*TMath::Cos(phi3*kDegrad);
1540     yc = rOuter*TMath::Sin(phi3*kDegrad);
1541
1542     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1543
1544     nRotMat++;
1545
1546
1547   } 
1548
1549
1550   // reflection matrix
1551
1552   theta1 = 90.;
1553   phi1   = 0.;
1554   theta2 = 90.;
1555   phi2   = 270.;
1556   theta3 = 180.;
1557   phi3   = 0.;
1558
1559   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1560
1561
1562   // TPMW->TPC
1563
1564   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1565   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1566   gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1567   gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1568
1569
1570
1571   //-------------------------------------------------------
1572   // Tpc High Voltage Membrane - NOMEX honeycomb
1573   //-------------------------------------------------------
1574
1575   dm[0]=0.,
1576   dm[1]=360.;
1577   dm[2]=18.;
1578   dm[3]=2.;
1579
1580   //
1581
1582   dm[4]= -0.3;
1583   dm[5]= 81.156;
1584   dm[6]= 253.386;
1585
1586   //
1587
1588   dm[7]= 0.3;
1589   dm[8]= dm[5];
1590   dm[9]= dm[6];
1591
1592   gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1593
1594   gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1595
1596   //----------------------------------------------------------
1597   // TPc Support Rods - MAKROLON
1598   //----------------------------------------------------------
1599
1600   dm[0]= 0.9;
1601   dm[1]= 1.2;
1602   dm[2]= 126.65;
1603
1604   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1605
1606   for(Int_t nrod=1;nrod<18;nrod++){
1607     Float_t angle=innerOpenAngle*(Float_t)nrod;
1608
1609     xc=82.4*TMath::Cos(angle);
1610     yc=82.4*TMath::Sin(angle);
1611
1612     gMC->Gspos("TPSR",nrod,"TDGS",xc,yc,126.95,0,"ONLY");
1613     gMC->Gspos("TPSR",nrod+17,"TDGS",xc,yc,-126.95,0,"ONLY");
1614
1615     xc=254.2*TMath::Cos(angle);
1616     yc=254.2*TMath::Sin(angle);
1617
1618     gMC->Gspos("TPSR",nrod+34,"TDGS",xc,yc,126.95,0,"ONLY");
1619     gMC->Gspos("TPSR",nrod+51,"TDGS",xc,yc,-126.95,0,"ONLY");    
1620
1621   }
1622
1623   //----------------------------------------------------------
1624   // Tpc High Voltage rod - MAKROLON + Copper cable
1625   //----------------------------------------------------------
1626
1627   // rod with cable (Left)
1628
1629   dm[0]=0.;
1630   dm[1]=2.25;
1631   dm[2]=126.65;
1632
1633   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1634
1635   // HV cable
1636  
1637   dm[0]=0.;
1638   dm[1]=0.3;
1639   dm[2]=126.65;
1640
1641   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1642
1643   // empty space
1644
1645   dm[0]=0.3;
1646   dm[1]=1.;
1647   dm[2]=126.65;
1648
1649   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1650
1651   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1652   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1653
1654   // rod without cable
1655
1656   dm[0]=1.8;
1657   dm[1]=2.25;
1658   dm[2]=126.65;
1659
1660   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1661
1662   
1663   
1664   gMC->Gspos("THVL",1,"TDGS",82.4,0.,-126.95,0,"ONLY");
1665   gMC->Gspos("THVL",2,"TDGS",254.2,0.,-126.95,0,"ONLY");
1666
1667   gMC->Gspos("THVR",1,"TDGS",82.4,0.,126.95,0,"ONLY");
1668   gMC->Gspos("THVR",2,"TDGS",254.2,0.,126.95,0,"ONLY");  
1669   
1670
1671
1672   gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY"); 
1673
1674   // services wheel cover -> wheel
1675
1676
1677   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1678   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1679
1680
1681   // put the wheel into the TPC
1682
1683   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1684   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1685
1686   gMC->Gsord("TPMW",6);
1687   gMC->Gsord("TSSW",6);
1688   gMC->Gsord("TSWC",6);
1689
1690   // put the TPC into ALIC (main mother volume)
1691
1692   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1693
1694  
1695 } // end of function
1696  
1697 //_____________________________________________________________________________
1698 void AliTPCv3::DrawDetector()
1699 {
1700   //
1701   // Draw a shaded view of the Time Projection Chamber version 1
1702   //
1703
1704
1705   // Set everything unseen
1706   gMC->Gsatt("*", "seen", -1);
1707   // 
1708   // Set ALIC mother transparent
1709   gMC->Gsatt("ALIC","SEEN",0);
1710   //
1711   // Set the volumes visible
1712   //
1713
1714   gMC->Gsatt("TPC ","SEEN",0);
1715   gMC->Gsatt("TOIN","SEEN",1);
1716   gMC->Gsatt("TOIN","COLO",7);
1717   gMC->Gsatt("TPCR","SEEN",0);
1718   gMC->Gsatt("TOCV","SEEN",1);
1719   gMC->Gsatt("TOCV","COLO",4);
1720   gMC->Gsatt("TSA1","SEEN",0);
1721   gMC->Gsatt("TSA2","SEEN",0);
1722   gMC->Gsatt("TSA3","SEEN",0);
1723   gMC->Gsatt("TSA4","SEEN",0);
1724   gMC->Gsatt("TOFC","SEEN",1);
1725   gMC->Gsatt("TOFC","COLO",4);
1726   gMC->Gsatt("TSA5","SEEN",0);
1727   gMC->Gsatt("TSA6","SEEN",0);
1728   gMC->Gsatt("TSA7","SEEN",0);
1729   gMC->Gsatt("TIIN","COLO",7);
1730   gMC->Gsatt("TIIN","SEEN",1);
1731   gMC->Gsatt("TICL","SEEN",0);
1732   gMC->Gsatt("TSA9","SEEN",0);
1733   gMC->Gsatt("TS10","SEEN",0);
1734   gMC->Gsatt("TS11","SEEN",0);
1735   gMC->Gsatt("TS12","SEEN",0);
1736   gMC->Gsatt("TICR","SEEN",0); 
1737   gMC->Gsatt("TS13","SEEN",0);
1738   gMC->Gsatt("TS14","SEEN",0);
1739   gMC->Gsatt("TS15","SEEN",0);
1740   gMC->Gsatt("TS16","SEEN",0);
1741   gMC->Gsatt("TIFC","SEEN",1);
1742   gMC->Gsatt("TIFC","COLO",4); 
1743   gMC->Gsatt("TS17","SEEN",0);
1744   gMC->Gsatt("TS18","SEEN",0);
1745   gMC->Gsatt("TS19","SEEN",0);
1746   gMC->Gsatt("TS21","SEEN",0);
1747   gMC->Gsatt("TS22","SEEN",0);
1748   gMC->Gsatt("TS23","SEEN",0);
1749   gMC->Gsatt("TS24","SEEN",0);
1750   gMC->Gsatt("TDGS","SEEN",0);
1751   gMC->Gsatt("TIRC","SEEN",0);
1752   gMC->Gsatt("TIC1","SEEN",1);
1753   gMC->Gsatt("TIPP","SEEN",0);
1754   gMC->Gsatt("TIC3","SEEN",0);
1755   gMC->Gsatt("TRCE","SEEN",0);
1756   gMC->Gsatt("TPSC","SEEN",0);
1757   gMC->Gsatt("TPCC","SEEN",0);
1758   gMC->Gsatt("TORC","SEEN",0);
1759   gMC->Gsatt("TOPP","SEEN",0);
1760   gMC->Gsatt("TOC3","SEEN",0);
1761   gMC->Gsatt("TOC1","SEEN",1);
1762   gMC->Gsatt("TSSW","SEEN",1);
1763   gMC->Gsatt("TSWC","SEEN",1);
1764   gMC->Gsatt("TSCE","SEEN",1); 
1765   gMC->Gsatt("TSSW","COLO",3);
1766   gMC->Gsatt("TSWC","COLO",3);
1767   gMC->Gsatt("TSCE","COLO",6);
1768   gMC->Gsatt("TWES","SEEN",0);
1769   gMC->Gsatt("TSWB","SEEN",0);
1770   gMC->Gsatt("TPEL","SEEN",0);
1771   gMC->Gsatt("TPMW","SEEN",1);
1772   gMC->Gsatt("TPEW","SEEN",1);
1773   gMC->Gsatt("TESR","SEEN",1);
1774   gMC->Gsatt("TPMW","COLO",12);
1775   gMC->Gsatt("TPEW","COLO",12);
1776   gMC->Gsatt("TWES","COLO",5);
1777   gMC->Gsatt("TIC1","COLO",5);
1778   gMC->Gsatt("TOC1","COLO",5);  
1779   gMC->Gsatt("TESB","SEEN",0);
1780   gMC->Gsatt("TPLS","SEEN",0);
1781   gMC->Gsatt("TPUS","SEEN",0);
1782   gMC->Gsatt("TPSS","SEEN",0);
1783   gMC->Gsatt("THVM","SEEN",1);
1784   gMC->Gsatt("THVM","COLO",11);
1785   gMC->Gsatt("TPSR","SEEN",0);
1786   gMC->Gsatt("THVL","SEEN",0);
1787   gMC->Gsatt("THVC","SEEN",0);
1788   gMC->Gsatt("THVE","SEEN",0);
1789   gMC->Gsatt("THVR","SEEN",0);
1790
1791   //
1792   gMC->Gdopt("hide", "on");
1793   gMC->Gdopt("shad", "on");
1794   gMC->Gsatt("*", "fill", 7);
1795   gMC->SetClipBox(".");
1796   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1797   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1798   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1799   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1800   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1801   gMC->DefaultRange();
1802   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1803   gMC->Gdhead(1111, "Time Projection Chamber");
1804   gMC->Gdman(18, 4, "MAN");
1805   gMC->Gdopt("hide","off");
1806 }
1807
1808 //_____________________________________________________________________________
1809 void AliTPCv3::CreateMaterials()
1810 {
1811   //
1812   // Define materials for version 2 of the Time Projection Chamber
1813   //
1814
1815
1816   //
1817   AliTPC::CreateMaterials();
1818 }
1819
1820 //_____________________________________________________________________________
1821 void AliTPCv3::Init()
1822 {
1823   //
1824   // Initialises version 3 of the TPC after that it has been built
1825   //
1826   Int_t *idtmed = fIdtmed->GetArray();
1827
1828   AliTPC::Init();
1829
1830   fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1831
1832   gMC->SetMaxNStep(30000); // max. number of steps increased
1833
1834   gMC->Gstpar(idtmed[2],"LOSS",5);
1835
1836   printf("*** TPC version 3 initialized ***\n");
1837   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1838
1839   //
1840   
1841 }
1842
1843 //_____________________________________________________________________________
1844 void AliTPCv3::StepManager()
1845 {
1846   //
1847   // Called for every step in the Time Projection Chamber
1848   //
1849
1850   //
1851   // parameters used for the energy loss calculations
1852   //
1853   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1854   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1855   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1856  
1857  
1858   const Float_t kbig = 1.e10;
1859
1860   Int_t id,copy;
1861   TLorentzVector pos;
1862   Float_t hits[4];
1863   Int_t vol[2];  
1864   TClonesArray &lhits = *fHits;
1865   
1866   vol[1]=0;
1867   vol[0]=0;
1868
1869   //
1870
1871   gMC->SetMaxStep(kbig);
1872   
1873   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1874   
1875   Float_t charge = gMC->TrackCharge();
1876   
1877   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1878   
1879   
1880   id=gMC->CurrentVolID(copy);
1881   
1882   // Check the sensitive volume
1883   
1884   if (id != fIdSens) return;
1885   
1886   //
1887   //  charged particle is in the sensitive volume
1888   //
1889   
1890   if(gMC->TrackStep() > 0) {
1891
1892     
1893     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1894     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1895     
1896     gMC->TrackPosition(pos);
1897     hits[0]=pos[0];
1898     hits[1]=pos[1];
1899     hits[2]=pos[2];
1900
1901     //
1902     // check the selected side of the TPC
1903     //
1904  
1905     if(fSide && fSide*hits[2]<=0.) return;
1906
1907     hits[3]=(Float_t)nel;
1908     
1909     // Add this hit
1910    
1911     new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1912     
1913   } 
1914   
1915   // Stemax calculation for the next step
1916   
1917   Float_t pp;
1918   TLorentzVector mom;
1919   gMC->TrackMomentum(mom);
1920   Float_t ptot=mom.Rho();
1921   Float_t betaGamma = ptot/gMC->TrackMass();
1922   
1923   Int_t pid=gMC->TrackPid();
1924   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1925     { 
1926       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1927     }
1928   else
1929     {
1930       pp=kprim*BetheBloch(betaGamma);    
1931       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1932     }
1933   
1934   Float_t random[1];
1935   gMC->Rndm(random,1); // good, old GRNDM from Geant3
1936   
1937   Double_t rnd = (Double_t)random[0];
1938   
1939   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1940   
1941 }
1942
1943 //_____________________________________________________________________________
1944 Float_t AliTPCv3::BetheBloch(Float_t bg)
1945 {
1946   //
1947   // Bethe-Bloch energy loss formula
1948   //
1949   const Double_t kp1=0.76176e-1;
1950   const Double_t kp2=10.632;
1951   const Double_t kp3=0.13279e-4;
1952   const Double_t kp4=1.8631;
1953   const Double_t kp5=1.9479;
1954
1955   Double_t dbg = (Double_t) bg;
1956
1957   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1958
1959   Double_t aa = TMath::Power(beta,kp4);
1960   Double_t bb = TMath::Power(1./dbg,kp5);
1961
1962   bb=TMath::Log(kp3+bb);
1963   
1964   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1965 }