3c324428c50fa1802110423b38970be7b29212f4
[u/mrichter/AliRoot.git] / TPC / AliTPCv3.cxx
1 /**************************************************************************
2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
5  * Contributors are mentioned in the code where appropriate.              *
6  *                                                                        *
7  * Permission to use, copy, modify and distribute this software and its   *
8  * documentation strictly for non-commercial purposes is hereby granted   *
9  * without fee, provided that the above copyright notice appears in all   *
10  * copies and that both the copyright notice and this permission notice   *
11  * appear in the supporting documentation. The authors make no claims     *
12  * about the suitability of this software for any purpose. It is          *
13  * provided "as is" without express or implied warranty.                  *
14  **************************************************************************/
15
16 /*
17 $Log$
18 Revision 1.17  2000/11/02 07:24:11  kowal2
19 Correction in the TPC geometry.
20 Changes due to the new hit structure.
21
22 Revision 1.16  2000/10/02 21:28:18  fca
23 Removal of useless dependecies via forward declarations
24
25 Revision 1.15  2000/07/10 20:57:39  hristov
26 Update of TPC code and macros by M.Kowalski
27
28 Revision 1.14  2000/06/30 12:07:50  kowal2
29 Updated from the TPC-PreRelease branch
30
31 Revision 1.13.2.4  2000/06/26 07:39:42  kowal2
32 Changes to obey the coding rules
33
34 Revision 1.13.2.3  2000/06/25 08:38:41  kowal2
35 Splitted from AliTPCtracking
36
37 Revision 1.13.2.2  2000/06/16 12:58:13  kowal2
38 Changed parameter settings
39
40 Revision 1.13.2.1  2000/06/09 07:15:07  kowal2
41
42 Defaults loaded automatically (hard-wired)
43 Optional parameters can be set via macro called in the constructor
44
45 Revision 1.13  2000/05/15 10:00:30  kowal2
46 Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova
47
48 Revision 1.12  2000/04/17 09:37:33  kowal2
49 removed obsolete AliTPCDigitsDisplay.C
50
51 Revision 1.11.8.2  2000/04/10 08:36:12  kowal2
52
53 Updated readout chambers
54 Some modifications to StepManager by M. Kowalski
55
56 Revision 1.11.8.1  2000/04/10 07:56:53  kowal2
57 Not used anymore - removed
58
59 Revision 1.11  1999/11/04 17:28:07  fca
60 Correct barrel part of HV Degrader
61
62 Revision 1.10  1999/10/14 16:52:08  fca
63 Only use PDG codes and not GEANT ones
64
65 Revision 1.9  1999/10/08 06:27:23  fca
66 Corrected bug in the HV degrader geometry, thanks to G.Tabary
67
68 Revision 1.8  1999/10/04 13:39:55  fca
69 Correct array index problem
70
71 Revision 1.7  1999/09/29 09:24:34  fca
72 Introduction of the Copyright and cvs Log
73
74 */
75
76 //
77 ///////////////////////////////////////////////////////////////////////////////
78 //                                                                           //
79 //  Time Projection Chamber version 3 -- detailed TPC and slow simulation    //
80 //                                                                     
81 //Begin_Html
82 /*
83 <img src="picts/AliTPCv3Class.gif">
84 */
85 //End_Html
86 //                                                                           //
87 //                                                                           //
88 ///////////////////////////////////////////////////////////////////////////////
89
90 #include <stdlib.h>
91 #include <TMath.h>
92 #include "AliTPCv3.h"
93 #include "AliRun.h"
94 #include "AliMC.h"
95 #include "AliConst.h"
96 #include "AliTPCDigitsArray.h"
97 #include"AliTPCParam.h"
98 #include"AliTPCParamSR.h"
99 #include "AliPDG.h"
100 #include <TInterpreter.h>
101
102 ClassImp(AliTPCv3)
103  
104 //_____________________________________________________________________________
105 AliTPCv3::AliTPCv3(const char *name, const char *title) :
106   AliTPC(name, title) 
107 {
108   //
109   // Standard constructor for Time Projection Chamber version 3
110   //
111
112   SetBufferSize(128000);
113   fIdSens=0;
114
115   SetGasMixt(2,20,10,-1,0.9,0.1,0.);
116
117   if (fTPCParam)
118      fTPCParam->Write(fTPCParam->GetTitle());
119 }
120  
121 //_____________________________________________________________________________
122 void AliTPCv3::CreateGeometry()
123 {
124   //
125   // Creation of the TPC coarse geometry (version 3)
126   // The whole drift volume is sensitive
127   // Origin Marek Kowalski Cracow
128   //
129   //Begin_Html
130   /*
131     <img src="picts/AliTPCgif">
132   */
133   //End_Html
134   //Begin_Html
135   /*
136     <img src="picts/AliTPCv3Tree.gif">
137   */
138   //End_Html
139   Float_t dm[50];
140
141   Int_t *idtmed = fIdtmed->GetArray(); // TPC media
142
143   Int_t idrotm[120]; // rotation matrices
144
145   Int_t nRotMat = 0; // actual number of rotation matrices
146
147
148   //
149   //  Mother volume (Air) - all volumes will be positioned in it
150   //
151   
152   dm[0]=0.;
153   dm[1]=360.;
154   dm[2]=12.;
155
156   //
157  
158   dm[3]= -283.7;
159   dm[4]= 66.2;
160   dm[5]= 277.95;
161
162   //
163
164   dm[6]= -255.6;
165   dm[7]= 66.2;
166   dm[8]= 277.95;
167
168   //
169
170   dm[9]= -73.3;
171   dm[10]= 59.0;
172   dm[11]= 277.95;
173
174   //
175
176   dm[12]= -73.3;
177   dm[13]= 56.9;
178   dm[14]= 277.95;
179
180   //
181
182   dm[15]= -72.1;
183   dm[16]= 56.9;
184   dm[17]= 277.95;
185
186   //
187
188   dm[18]= -72.1;
189   dm[19]= 60.65;
190   dm[20]= 277.95;
191
192   //
193
194   dm[21]= 72.1;
195   dm[22]= 60.65;
196   dm[23]= 277.95;  
197
198   //
199
200   dm[24]= 72.1;
201   dm[25]= 56.9;
202   dm[26]= 277.95;
203
204   //
205
206   dm[27]= 73.3;
207   dm[28]= 56.9;
208   dm[29]= 277.95;
209
210   //
211
212   dm[30]= 73.3;
213   dm[31]= 60.65;
214   dm[32]= 277.95;
215
216   //
217
218   dm[33]= 250.4;
219   dm[34]= 66.0;
220   dm[35]= 277.95;
221
222   //
223
224   dm[36]= 283.7;
225   dm[37]= 66.0;
226   dm[38]= 277.95;
227
228
229   gMC->Gsvolu("TPC ","PCON",idtmed[0],dm,39);
230
231
232   //-------------------------------------------------------------------
233   //  Tpc Outer INsulator (CO2)
234   //-------------------------------------------------------------------
235
236   dm[0]= 0.;
237   dm[1]= 360.;
238   dm[2]= 6.;
239
240   //
241  
242   dm[3]= -253.6;
243   dm[4]= 258.;
244   dm[5]= 266.65;
245
246   //
247
248   dm[6]= -253.;
249   dm[7]= 258.;
250   dm[8]= 266.65;
251
252   dm[9]= -253.;
253   dm[10]= 258.;
254   dm[11]= 277.97;
255
256   dm[12]= 253.6;
257   dm[13]= 258.;
258   dm[14]= 277.97;
259
260   //
261
262   dm[15]= 253.6;
263   dm[16]= 265.2;
264   dm[17]= 277.95;
265
266   //
267
268   dm[18]= 255.6;
269   dm[19]= 265.2;
270   dm[20]= 277.95;
271
272
273   gMC->Gsvolu("TOIN","PCON",idtmed[3],dm,21);
274
275   //---------------------------------------------------------------
276   // shreds (G10) - TPC Rings
277   //---------------------------------------------------------------
278
279   gMC->Gsvolu("TPCR","TUBE",idtmed[12],dm,0);
280
281   dm[0]= 258.;
282   dm[1]= 266.65;
283   dm[2]= 0.3;
284
285   gMC->Gsposp("TPCR",1,"TOIN",0.,0.,-253.3,0,"ONLY",dm,3); // left bottom
286
287   //
288
289   dm[0]= 258.;
290   dm[1]= 270.9;
291   dm[2]= 0.3;
292
293   gMC->Gsposp("TPCR",2,"TOIN",0.,0.,253.3,0,"ONLY",dm,3); // right
294
295   //
296
297   dm[0]= 272.2;
298   dm[1]= 277.95;
299   dm[2]= 0.3;
300
301   gMC->Gsposp("TPCR",3,"TOIN",0.,0.,-250.7,0,"ONLY",dm,3); // left top
302
303   //----------------------------------------------------------------
304   // Tpc Outer Contaiment Vessel  
305   //  mother volume - Al, daughters - composite (sandwich)
306   //----------------------------------------------------------------
307   
308   dm[0]= 0.;
309   dm[1]= 360.;
310   dm[2]=5.;
311
312   //
313
314   dm[3]= -250.4;
315   dm[4]= 272.2;
316   dm[5]= 277.95;
317
318   //
319
320   dm[6]= -248.4;
321   dm[7]= 272.2;
322   dm[8]= 277.95;
323
324   //
325
326   dm[9]= 253.6;
327   dm[10]= 272.2;
328   dm[11]= 277.95;
329
330   //
331
332   dm[12]= 253.6;
333   dm[13]= 265.2;
334   dm[14]= 277.95;
335
336   // 
337
338   dm[15]= 255.6;
339   dm[16]= 265.2;
340   dm[17]= 277.95;
341
342   gMC->Gsvolu("TOCV","PCON",idtmed[4],dm,18);
343
344   // Daughter volumes
345
346   // Tpc SAndwich 1 - Al
347  
348   dm[0]= 274.81;
349   dm[1]= 277.95;
350   dm[2]= 251.7;
351
352   gMC->Gsvolu("TSA1","TUBE",idtmed[4],dm,3);
353
354   // Tpc SAndwich 2 - Tedlar
355
356   dm[0] += 5.e-3;
357   dm[1] -= 5.e-3;
358   
359   gMC->Gsvolu("TSA2","TUBE",idtmed[9],dm,3);
360
361   // Tpc SAndwich 3 - Kevlar
362
363   dm[0] += 5e-3;
364   dm[1] -= 5.e-3;
365
366   gMC->Gsvolu("TSA3","TUBE",idtmed[5],dm,3);
367
368   // Tpc SAndwich 4 - NOMEX honeycomb
369
370   dm[0] += 0.06;
371   dm[1] -= 0.06;
372
373   gMC->Gsvolu("TSA4","TUBE",idtmed[5],dm,3);  
374   
375   // 4->3->2->1->TOCV
376
377   gMC->Gspos("TSA4",1,"TSA3",0.,0.,0.,0,"ONLY");
378   gMC->Gspos("TSA3",1,"TSA2",0.,0.,0.,0,"ONLY");
379   gMC->Gspos("TSA2",1,"TSA1",0.,0.,0.,0,"ONLY");
380
381   gMC->Gspos("TSA1",1,"TOCV",0.,0.,2.6,0,"ONLY");
382
383   // TCOV-> TOIN
384
385   gMC->Gspos("TOCV",1,"TOIN",0.,0.,0.,0,"ONLY");
386
387   //-------------------------------------------------------
388   //  Tpc Outer Field Cage
389   //  mother volume - Al, daughters - composite (sandwich)
390   //-------------------------------------------------------
391
392   dm[0]=0.;
393   dm[1]=360.;
394   dm[2]=6.;
395
396   dm[3]= -253.;
397   dm[4]= 258.;
398   dm[5]= 277.95;
399
400   //
401
402   dm[6]= -251.;
403   dm[7]= 258.;
404   dm[8]= 277.95;
405
406   //
407  
408   dm[9]= -251.;
409   dm[10]= 258.;
410   dm[11]= 260.05;
411
412   //
413
414   dm[12]= 251.;
415   dm[13]= 258.;
416   dm[14]= 260.05;
417
418   //
419
420   dm[15]= 251.;
421   dm[16]= 258.;
422   dm[17]= 260.05;
423
424   //
425
426   dm[18]= 253.;
427   dm[19]= 258.;
428   dm[20]= 270.9;
429
430   gMC->Gsvolu("TOFC","PCON",idtmed[4],dm,21);  
431
432   // Daughter volumes 
433
434   // Tpc SAndwich 5 - Tedlar
435
436   dm[0]= 258.;
437   dm[1]= 260.05;
438   dm[2]= 251.7;
439
440   gMC->Gsvolu("TSA5","TUBE",idtmed[9],dm,3);
441
442   // Tpc SAndwich 6 - Kevlar
443
444   dm[0] += 5.e-3;
445   dm[1] -= 5.e-3;
446
447   gMC->Gsvolu("TSA6","TUBE",idtmed[5],dm,3);
448
449
450   // Tpc SAndwich 7 - NOMEX
451
452   dm[0] += 0.02;
453   dm[1] -= 0.02;
454
455   gMC->Gsvolu("TSA7","TUBE",idtmed[6],dm,3);    
456
457   // 7->6->5->TOFC
458
459   gMC->Gspos("TSA7",1,"TSA6",0.,0.,0.,0,"ONLY");
460   gMC->Gspos("TSA6",1,"TSA5",0.,0.,0.,0,"ONLY"); 
461
462   gMC->Gspos("TSA5",1,"TOFC",0.,0.,0.,0,"ONLY");
463
464   // TOFC->TOIN
465
466   gMC->Gspos("TOFC",1,"TOIN",0.,0.,0.,0,"ONLY"); 
467
468   // TOIN->TPC
469
470   gMC->Gspos("TOIN",1,"TPC ",0.,0.,0.,0,"ONLY");
471
472   //--------------------------------------------------------------------
473   // Tpc Inner INsulator (CO2)
474   //--------------------------------------------------------------------
475
476
477   dm[0]=0.;
478   dm[1]= 360.;
479   dm[2]= 15.;
480
481   //
482
483   dm[3]= -255.6;
484   dm[4]= 66.2;
485   dm[5]= 74.8;
486
487   //
488
489   Float_t tanL = (66.2-59.0)/(255.6-73.3); // tangent of the left cone part
490
491   dm[6]= -253.6;
492   dm[7]= 59.0+ (253.6-73.3)*tanL;
493   dm[8]= 74.8;
494
495   //
496
497   dm[9]= -253.6;
498   dm[10]= dm[7];
499   dm[11]= 79.2;
500
501   //
502
503   dm[12]= -73.3;
504   dm[13]= 59.0;
505   dm[14]= 79.2;
506
507   //
508
509   dm[15]= -73.3;
510   dm[16]= 56.9;
511   dm[17]= 79.2;
512
513   //
514
515   dm[18]= -72.1;
516   dm[19]= 59.6;
517   dm[20]= 79.2;
518
519   //
520
521   dm[21]= -72.1;
522   dm[22]= 60.65;
523   dm[23]= 79.2;
524
525   //
526
527   dm[24]= 72.1;
528   dm[25]= 60.65;
529   dm[26]= 79.2;  
530
531   //
532
533   dm[27]= 72.1;
534   dm[28]= 59.6;
535   dm[29]= 79.2;
536
537   //
538
539   dm[30]= 73.3;
540   dm[31]= 56.9;
541   dm[32]= 79.2;
542
543   //
544
545   dm[33]= 73.3;
546   dm[34]= 59.0;
547   dm[35]= 79.2;
548
549   //
550
551   dm[36]= 250.4;
552   dm[37]= 66.0;
553   dm[38]= 79.2;
554
555   //
556   
557   dm[39]= 253.0;
558   dm[40]= 66.0;
559   dm[41]= 79.2;
560
561   //
562
563   dm[42]= 253.0;
564   dm[43]= 75.3;
565   dm[44]= 79.2;
566
567   //
568
569   dm[45]= 253.6;
570   dm[46]= 75.3;
571   dm[47]= 79.2;
572
573   gMC->Gsvolu("TIIN","PCON",idtmed[3],dm,48);
574
575
576   //--------------------------------------------------------------------
577   //  Tpc Inner Containment vessel, Left part
578   //  mother volume - Al, daughter - composite (sandwich)
579   //--------------------------------------------------------------------
580
581   dm[0]= 0.;
582   dm[1]= 360.;
583   dm[2]= 8.;
584
585   //
586
587   dm[3]= -255.6;
588   dm[4]= 66.2;
589   dm[5]= 74.8;
590
591   //
592
593   Float_t cosL = 1./TMath::Sqrt(1.+tanL*tanL);
594   Float_t sandThick = 2.14; // cone composite thickness
595
596
597   //
598
599   dm[6]= -253.6;
600   dm[7]= 59.0 + (253.6-73.3)*tanL;
601   dm[8]= 74.8;
602
603   //
604
605   dm[9]= -253.6;
606   dm[10]= dm[7];
607   dm[11]= dm[7]+sandThick/cosL;
608
609   //
610
611   dm[12]= -75.6;
612   dm[13]= 59.0+(75.6-73.3)*tanL;
613   dm[14]= dm[13]+sandThick/cosL;
614
615   //
616
617   dm[15]= -75.6;
618   dm[16]= dm[13];
619   dm[17]= 60.65;
620
621   //
622
623   dm[18]= -73.3;
624   dm[19]= 59.0;
625   dm[20]= 60.65;
626
627   //
628
629   dm[21]= -73.3;
630   dm[22]= 56.9;
631   dm[23]= 60.65;
632
633   //
634
635   dm[24]= -72.1;
636   dm[25]= 56.9;
637   dm[26]= 60.65;
638
639   gMC->Gsvolu("TICL","PCON",idtmed[4],dm,27);
640
641   // Daughter volumes 
642
643   // Tpc SAndwich 9 - Al
644
645   dm[0]= 0.;
646   dm[1]= 360.;
647   dm[2]= 2.;
648
649   //
650
651   dm[3]= - 254.3;
652   dm[4]= 59.0+(254.3-73.3)*tanL;
653   dm[5]= dm[4]+sandThick/cosL;
654
655   //
656
657   dm[6]= -78.3;
658   dm[7]= 59.0+(78.3-73.3)*tanL;
659   dm[8]= dm[7]+sandThick/cosL;
660
661   //
662
663   gMC->Gsvolu("TSA9","PCON",idtmed[4],dm,9);
664
665   // Tpc SAndwich 10 - Tedlar
666
667   dm[4]+= 5.e-3/cosL;
668   dm[5]-= 5.e-3/cosL;
669
670   //
671
672   dm[7]+= 5.e-3/cosL;
673   dm[8]+= 5.e-3/cosL;
674
675   gMC->Gsvolu("TS10","PCON",idtmed[9],dm,9); 
676
677   // Tpc SAndwich 11 - Kevlar
678
679   dm[4]+= 5.e-3/cosL;
680   dm[5]-= 5.e-3/cosL;
681
682   //
683
684   dm[7]+= 5.e-3/cosL;
685   dm[8]+= 5.e-3/cosL;
686
687   gMC->Gsvolu("TS11","PCON",idtmed[5],dm,9); 
688
689   // Tpc SAndwich 12 - NOMEX
690
691   dm[4]+= 0.06/cosL;
692   dm[5]-= 0.06/cosL;
693
694   //
695
696   dm[7]+= 0.06/cosL;
697   dm[8]+= 0.06/cosL;
698
699   gMC->Gsvolu("TS12","PCON",idtmed[6],dm,9);   
700
701   // 12->11->10->9
702
703   gMC->Gspos("TS12",1,"TS11",0.,0.,0.,0,"ONLY");
704   gMC->Gspos("TS11",1,"TS10",0.,0.,0.,0,"ONLY");
705   gMC->Gspos("TS10",1,"TSA9",0.,0.,0.,0,"ONLY");
706
707   // TSA9->TICL
708
709   gMC->Gspos("TSA9",1,"TICL",0.,0.,0.,0,"ONLY");
710  
711   //--------------------------------------------------------------------
712   //  Tpc Inner Containment vessel, Right part
713   //  mother volume - Al, daughter - composite (sandwich)
714   //--------------------------------------------------------------------
715
716   dm[0]= 0.;
717   dm[1]= 360.;
718   dm[2]=8.;
719
720   //
721
722   dm[3]= 72.1;
723   dm[4]= 56.9;
724   dm[5]= 60.65;
725
726   //
727
728   dm[6]= 73.3;
729   dm[7]= 56.9;
730   dm[8]= 60.65;
731
732   //
733
734   dm[9]= 73.3;
735   dm[10]= 59.0;
736   dm[11]= 60.65;
737
738   //
739
740   Float_t tanR = (66.0-59.0)/(250.5-73.3); // to avoid accuracy problems
741   Float_t cosR = 1./TMath::Sqrt(1.+tanR*tanR); //as above
742
743   //
744
745   dm[12]= 75.6;
746   dm[13]= 59.0+(75.6-73.3)*tanR;
747   dm[14]= 60.65;
748
749   //
750
751   dm[15]= 75.6;
752   dm[16]= dm[13];
753   dm[17]= dm[16]+sandThick/cosR;
754
755   //
756
757   dm[18]= 248.4;
758   dm[19]= 59.0+(248.4-73.3)*tanR;
759   dm[20]= dm[19]+sandThick/cosR;
760
761   //
762
763   dm[21]= 248.4;
764   dm[22]= dm[19];
765   dm[23]= 70.2;
766
767   //
768
769   dm[24]= 250.4;
770   dm[25]= 66.0;
771   dm[26]= 70.2;
772
773   gMC->Gsvolu("TICR","PCON",idtmed[4],dm,27);
774
775
776
777   // Daughter volumes 
778
779   // Tpc SAndwich 13 - Al
780
781   dm[0]= 0.;
782   dm[1]= 360.;
783   dm[2]= 2.;
784
785   //
786
787   dm[3]= 78.3;
788   dm[4]= 59.0+(78.3-73.3)*tanR;
789   dm[5]= dm[4]+sandThick/cosR;
790
791   //
792
793   dm[6]= 249.1;
794   dm[7]= 59.0+(249.1-73.3)*tanR;
795   dm[8]= dm[7]+sandThick/cosR;
796
797   //
798
799   gMC->Gsvolu("TS13","PCON",idtmed[4],dm,9);
800
801   // Tpc SAndwich 14 - Tedlar
802
803   dm[4]+= 5.e-3/cosR;
804   dm[5]-= 5.e-3/cosR;
805
806   //
807
808   dm[7]+= 5.e-3/cosR;
809   dm[8]+= 5.e-3/cosR;
810
811   gMC->Gsvolu("TS14","PCON",idtmed[9],dm,9); 
812
813   // Tpc SAndwich 15 - Kevlar
814
815   dm[4]+= 5.e-3/cosR;
816   dm[5]-= 5.e-3/cosR;
817
818   //
819
820   dm[7]+= 5.e-3/cosR;
821   dm[8]+= 5.e-3/cosR;
822
823   gMC->Gsvolu("TS15","PCON",idtmed[5],dm,9); 
824
825   // Tpc SAndwich 16 - NOMEX
826
827   dm[4]+= 0.06/cosR;
828   dm[5]-= 0.06/cosR;
829
830   //
831
832   dm[7]+= 0.06/cosR;
833   dm[8]+= 0.06/cosR;
834
835   gMC->Gsvolu("TS16","PCON",idtmed[6],dm,9);   
836
837   // 16->15->14->13
838
839   gMC->Gspos("TS16",1,"TS15",0.,0.,0.,0,"ONLY");
840   gMC->Gspos("TS15",1,"TS14",0.,0.,0.,0,"ONLY");
841   gMC->Gspos("TS14",1,"TS13",0.,0.,0.,0,"ONLY");
842
843   // TS12->TICR
844
845   gMC->Gspos("TS13",1,"TICR",0.,0.,0.,0,"ONLY");
846
847   //------------------------------------------------------
848   // Tpc Inner Field Cage
849   // mother volume - Al, daughters - composite (sandwich)
850   //------------------------------------------------------
851
852   dm[0]= 0.;
853   dm[1]= 360.;
854   dm[2]=6.;
855
856   //
857
858   dm[3]= -253.0;
859   dm[4]= 70.7;
860   dm[5]= 79.2;
861
862   //
863
864   dm[6]= -251.0;
865   dm[7]= 70.7;
866   dm[8]= 79.2;
867
868   //
869
870   dm[9]= -251.0;
871   dm[10]= 77.15;
872   dm[11]= 79.2;
873
874   //
875   
876   dm[12]= 251.0;
877   dm[13]= 77.15;
878   dm[14]= 79.2;
879
880   //
881
882   dm[15]= 251.0;
883   dm[16]= 66.0;
884   dm[17]= 79.2;
885
886   //
887
888   dm[18]= 253.0;
889   dm[19]= 66.0;
890   dm[20]= 79.2;
891
892   gMC->Gsvolu("TIFC","PCON",idtmed[4],dm,21);
893
894   // Daughter volumes
895
896   // Tpc Sandwich 17 - Tedlar
897
898   dm[0]= 77.15;
899   dm[1]= 79.2;
900   dm[2]= 251.7;
901
902   gMC->Gsvolu("TS17","TUBE",idtmed[9],dm,3);
903
904   // Tpc Sandwich 18 - Kevlar
905
906   dm[0]+= 5.e-3;
907   dm[1]-= 5.e-3;
908
909   gMC->Gsvolu("TS18","TUBE",idtmed[5],dm,3);
910
911
912   // Tpc Sandwich 19 - NOMEX
913
914   dm[0]+= 0.02;
915   dm[1]-= 0.02;
916
917   gMC->Gsvolu("TS19","TUBE",idtmed[6],dm,3);
918
919   // 19->18->17
920
921   gMC->Gspos("TS19",1,"TS18",0.,0.,0.,0,"ONLY");
922   gMC->Gspos("TS18",1,"TS17",0.,0.,0.,0,"ONLY");
923
924   // TS17->TIFC
925
926   gMC->Gspos("TS17",1,"TIFC",0.,0.,0.,0,"ONLY");
927
928   // TPC Rings
929
930   dm[0]= 70.7;
931   dm[1]= 79.2;
932   dm[2]= 0.3;
933
934   gMC->Gsposp("TPCR",4,"TIIN",0.,0.,-253.3,0,"ONLY",dm,3);
935
936   dm[0]= 66.0;
937   dm[1]= 70.2;  
938
939   gMC->Gsposp("TPCR",5,"TIIN",0.,0.,250.7,0,"ONLY",dm,3);
940
941   dm[0]= 75.3;
942   dm[1]= 79.2;  
943
944   gMC->Gsposp("TPCR",6,"TIIN",0.,0.,253.3,0,"ONLY",dm,3);  
945
946   // TICL->TIIN
947
948   gMC->Gspos("TICL",1,"TIIN",0.,0.,0.,0,"ONLY");
949
950   // TICR->TIIN
951
952   gMC->Gspos("TICR",1,"TIIN",0.,0.,0.,0,"ONLY");
953
954   // TIFC->TIIN
955
956   gMC->Gspos("TIFC",1,"TIIN",0.,0.,0.,0,"ONLY");
957
958   // Tpc Sandwich 21 - Al (central barrel)
959
960   dm[0]= 60.65;
961   dm[1]= 61.21;
962   dm[2]= 75.2;
963
964   gMC->Gsvolu("TS21","TUBE",idtmed[4],dm,3);
965
966   // Tpc Sandwich 22 - Tedlar (central barrel) 
967
968   dm[0]+= 5.e-3;
969   dm[1]-= 5.e-3;
970
971   gMC->Gsvolu("TS22","TUBE",idtmed[9],dm,3); 
972
973   // Tpc Sandwich 23 - Kevlar (central barrel) 
974
975   dm[0]+= 5.e-3;
976   dm[1]-= 5.e-3;
977
978   gMC->Gsvolu("TS23","TUBE",idtmed[5],dm,3); 
979
980   // Tpc Sandwich 24 - NOMEX (central barrel) 
981
982   dm[0]+= 0.02;
983   dm[1]-= 0.02;
984
985   gMC->Gsvolu("TS24","TUBE",idtmed[6],dm,3); 
986
987   // 24->23->22->21
988
989   gMC->Gspos("TS24",1,"TS23",0.,0.,0.,0,"ONLY");
990   gMC->Gspos("TS23",1,"TS22",0.,0.,0.,0,"ONLY");
991   gMC->Gspos("TS22",1,"TS21",0.,0.,0.,0,"ONLY");
992
993   gMC->Gspos("TS21",1,"TIIN",0.,0.,0.,0,"ONLY");
994
995   // put everything into the TPC 
996
997   gMC->Gspos("TIIN",1,"TPC ",0.,0.,0.,0,"ONLY");
998
999
1000   //---------------------------------------------------------
1001   //  Tpc Dift Gas volume Nonsensitive (Ne-CO2 90/10)
1002   //  and its daughters (HV membrane, rods, readout chambers)
1003   //---------------------------------------------------------
1004
1005   dm[0]= 79.2;
1006   dm[1]= 258.0;
1007   dm[2]= 253.6;
1008
1009   gMC->Gsvolu("TDGS","TUBE",idtmed[2],dm,3);  
1010
1011   // sector opening angles
1012
1013   Float_t innerOpenAngle = fTPCParam->GetInnerAngle();
1014
1015   // sector angle shift
1016
1017   Float_t innerAngleShift = fTPCParam->GetInnerAngleShift();
1018
1019   // number of sectors
1020
1021   Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
1022   Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
1023
1024   // All above parameters are identical for inner and outer
1025   // sectors. The distinction is kept for the historical reasons
1026   // and eventually will disappear.
1027
1028   Float_t tanAlpha = TMath::Tan(0.5*innerOpenAngle);
1029   Float_t cosAlpha = TMath::Sqrt(1.+tanAlpha*tanAlpha);
1030   Float_t space;
1031
1032   //-------------------------------------------------------------------------
1033   //   Tpc Inner Readout Chambers 
1034   //-------------------------------------------------------------------------
1035
1036   dm[0]= 14.483;
1037   dm[1]= 23.3345; 
1038   dm[2]= 1.6; // thickness
1039   dm[3]= 25.1;
1040
1041   gMC->Gsvolu("TIRC","TRD1",idtmed[4],dm,4);
1042
1043   // this volume will be positioned in the empty space
1044   // of the end-cap to avoid overlaps
1045
1046   dm[0]= 13.7305;
1047   dm[1]= 21.1895;
1048   dm[2]= 2.25;
1049   dm[3]= 21.15;
1050
1051   gMC->Gsvolu("TIC1","TRD1",idtmed[4],dm,4);
1052
1053
1054   //------------------------------------------------
1055   // Tpc Inner readout chamber Pad Plane
1056   //------------------------------------------------
1057
1058   dm[0]= 14.483;
1059   dm[1]= 23.3345;
1060   dm[2]= 0.5;
1061   dm[3]= 25.1;
1062
1063   gMC->Gsvolu("TIPP","TRD1",idtmed[12],dm,4);
1064
1065   // 
1066
1067   dm[0] -= 1.218511934;
1068   dm[1] -= 1.218511934;
1069   dm[2] = 0.35;
1070
1071   gMC->Gsvolu("TIC3","TRD1",idtmed[2],dm,4);
1072
1073   gMC->Gspos("TIC3",1,"TIPP",0.,0.15,0.,0,"ONLY");
1074
1075   gMC->Gspos("TIPP",1,"TIRC",0.,1.1,0.,0,"ONLY");
1076
1077
1078   //----------------------------------------------
1079   // Tpc Readout Chambers Empty spaces - for both
1080   // inner and outer sectors
1081   //----------------------------------------------
1082
1083   gMC->Gsvolu("TRCE","TRD1",idtmed[0],dm,0);
1084
1085   // Inner sector - 4 spaces
1086
1087
1088   dm[3] = 4.7625;
1089   dm[0] = 12.472;
1090
1091   Float_t rr = 90.52;
1092   Float_t zz;
1093
1094   zz= -12.7875;
1095   
1096   space = rr*tanAlpha-dm[0];
1097
1098   for(Int_t nsLow=0;nsLow<4;nsLow++){
1099
1100     rr += 9.525;
1101     dm[1]= rr*tanAlpha - space;  
1102
1103     dm[2]=0.8;
1104
1105     gMC->Gsposp("TRCE",nsLow+1,"TIRC",0.,-0.8,zz,0,"ONLY",dm,4);
1106
1107     //
1108
1109     dm[2]= 1.2;
1110
1111     gMC->Gsposp("TRCE",nsLow+5,"TIC1",0.,1.05,zz-2.1,0,"ONLY",dm,4);
1112
1113     rr += 0.4;
1114     dm[0] = rr*tanAlpha - space;
1115     zz += (0.4+9.525); 
1116
1117   }
1118
1119   dm[0]= 12.472;
1120   // dm[1] - this is the dm[1] from the previous TRCE
1121   dm[2]= 1.05;
1122   dm[3]= 19.65;
1123
1124   gMC->Gsposp("TRCE",9,"TIC1",0.,-1.,0.,0,"ONLY",dm,4);   
1125
1126   //
1127   // TPc Space for Connectors
1128   //
1129
1130   dm[0]= .3;
1131   dm[1]= .3;
1132   dm[2]= 4.5;
1133
1134   gMC->Gsvolu("TPSC","BOX ",idtmed[0],dm,3);
1135
1136   // TPC Connectors
1137
1138   dm[0]= .25;
1139   dm[1]= .15;
1140   dm[2]= 3.75;
1141
1142   gMC->Gsvolu("TPCC","BOX ",idtmed[13],dm,3); 
1143
1144   gMC->Gspos("TPCC",1,"TPSC",0.,0.15,0.,0,"ONLY");
1145
1146   zz = -12.7875;
1147
1148
1149   Float_t alpha;
1150   Float_t astep;
1151
1152   Float_t phi1,phi2,phi3,theta1,theta2,theta3; // rotation angles
1153
1154   // inner part of the inner sector - 2 x 20 holes
1155   
1156   astep = 20.00096874/19.;
1157
1158   alpha = 10.00048437-astep;
1159
1160   Float_t x1,x2;
1161
1162     x1 = 13.31175725;
1163     x1 -= 0.996357832; 
1164
1165     x2 = 15.06180253;
1166     x2 -= 1.163028812;
1167
1168   Int_t ncon;
1169
1170   for(ncon=0;ncon<20;ncon++){
1171
1172     phi1 = 0.;
1173     theta1 = 90.+alpha;
1174     phi2=90.;
1175     theta2 = 90.;
1176     phi3 = (alpha>0) ? 0. : 180.;
1177     theta3 = TMath::Abs(alpha);
1178
1179     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1180
1181  
1182
1183     gMC->Gspos("TPSC",ncon+1,"TIRC",x1,0.3,-12.7875,idrotm[nRotMat],"ONLY");
1184     gMC->Gspos("TPSC",ncon+21,"TIRC",x2,0.3,-2.8625,idrotm[nRotMat],"ONLY");
1185
1186
1187     x1 -= 1.296357833;
1188     x2 -= 1.463028812;
1189
1190     alpha -= astep;   
1191     nRotMat++; 
1192
1193   }
1194
1195   // outer part of the inner sector - 2 x 25 holes
1196
1197    astep = 20.00096874/24.; 
1198    alpha = 10.00048437-astep;
1199
1200    x1 = 16.81184781;
1201    x1 -= 1.016295986;
1202
1203    x2 = 18.5618931;
1204    x2 -= 1.150914854;
1205
1206   for(ncon=0;ncon<25;ncon++){
1207
1208     phi1 = 0.;
1209     theta1 = 90.+alpha;
1210     phi2=90.;
1211     theta2 = 90.;
1212     phi3 = (alpha>0) ? 0. : 180.;
1213     theta3 = TMath::Abs(alpha);
1214
1215     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1216
1217  
1218
1219     gMC->Gspos("TPSC",ncon+41,"TIRC",x1,0.3,7.0625,idrotm[nRotMat],"ONLY");
1220     gMC->Gspos("TPSC",ncon+66,"TIRC",x2,0.3,16.9875,idrotm[nRotMat],"ONLY");
1221
1222
1223     x1 -= 1.316295986;
1224     x2 -= 1.450914854;
1225
1226     alpha -= astep;   
1227     nRotMat++; 
1228
1229   }  
1230
1231   //--------------------------------------------------------------------------
1232   //  TPC Outer Readout Chambers
1233   //  this is NOT a final design
1234   //--------------------------------------------------------------------------
1235
1236   dm[0]= 23.3875;
1237   dm[1]= 43.524;
1238   dm[2]= 1.5; //thickness
1239   dm[3]= 57.1;
1240
1241   gMC->Gsvolu("TORC","TRD1",idtmed[4],dm,4);
1242
1243   //------------------------------------------------
1244   // Tpc Outerr readout chamber Pad Plane
1245   //------------------------------------------------
1246
1247   dm[2]= 0.5;
1248
1249   gMC->Gsvolu("TOPP","TRD1",idtmed[12],dm,4);
1250
1251   dm[0] -= 1.218511934;
1252   dm[1] -= 1.218511934;
1253   dm[2] = 0.35;
1254
1255   gMC->Gsvolu("TOC3","TRD1",idtmed[2],dm,4);
1256
1257   gMC->Gspos("TOC3",1,"TOPP",0.,0.15,0.,0,"ONLY");
1258
1259   gMC->Gspos("TOPP",1,"TORC",0.,1.0,0.,0,"ONLY");
1260
1261   // empty space
1262
1263
1264   dm[0]= 21.035;
1265   dm[1]= 38.7205;
1266   dm[2]= 0.7; 
1267   dm[3]= 50.15;
1268
1269   gMC->Gsposp("TRCE",10,"TORC",0.,-0.8,-2.15,0,"ONLY",dm,4);  
1270
1271   dm[0]= 22.2935;
1272   dm[1]= 40.5085;
1273   dm[2]= 2.25;
1274   dm[3]= 51.65;
1275
1276   gMC->Gsvolu("TOC1","TRD1",idtmed[4],dm,4);
1277
1278
1279   dm[0]= 21.35;
1280   dm[1]= 38.7205;
1281   dm[2]= 2.25;
1282   dm[3]= 50.15;
1283
1284   gMC->Gsposp("TRCE",11,"TOC1",0.,0.,0.,0,"ONLY",dm,4); 
1285
1286
1287   //-----------------------------------------------
1288   // Tpc Services Support Wheel
1289   //-----------------------------------------------
1290
1291   dm[0]=0.;
1292   dm[1]=360.;
1293   dm[2]=18.;
1294   dm[3]=2.;
1295
1296   dm[4]= -5.;
1297   dm[5]= 77.017;
1298   dm[6]= 255.267;
1299
1300   dm[7]= 5.;
1301   dm[8]= dm[5];
1302   dm[9]= dm[6];
1303
1304   gMC->Gsvolu("TSSW","PGON",idtmed[4],dm,10);
1305
1306   // Tpc Services Wheel Cover
1307
1308   dm[4]= -0.5;
1309   dm[7]= 0.5;
1310
1311   gMC->Gsvolu("TSWC","PGON",idtmed[4],dm,10);
1312
1313   // Tpc Service wheel Cover Empty space
1314    
1315   dm[0]= 10.99;
1316   dm[1]= 39.599;
1317   dm[2]= .5;
1318   dm[3]= 81.125;
1319
1320   gMC->Gsvolu("TSCE","TRD1",idtmed[0],dm,4);
1321
1322   // Tpc services Wheel Empty Spaces
1323
1324   dm[0]= 13.18017507;
1325   dm[1]= 44.61045938;
1326   dm[2]= 4.;
1327   dm[3]= 89.125;
1328
1329   gMC->Gsvolu("TWES","TRD1",idtmed[0],dm,4);
1330
1331   // Tpc Services Wheel Bars
1332
1333   gMC->Gsvolu("TSWB","TRD1",idtmed[4],dm,0);
1334
1335   // bars-> TWES
1336
1337   dm[2]= 4.;
1338   dm[3]= .4;
1339
1340   dm[0]= 13.8149522;
1341   dm[1]= 13.95601379;
1342   
1343   gMC->Gsposp("TSWB",1,"TWES",0.,0.,-85.125,0,"ONLY",dm,4);
1344
1345   dm[0]= 43.83462067; 
1346   dm[1]= 43.97568225;
1347
1348   gMC->Gsposp("TSWB",2,"TWES",0.,0.,85.125,0,"ONLY",dm,4);
1349
1350   // TPc ELectronics - right now 30% X0 Si
1351
1352   dm[0]= 14.03813696;
1353   dm[1]= 43.3524075;
1354   dm[2]= 1.404;
1355   dm[3]= 83.125;
1356
1357   gMC->Gsvolu("TPEL","TRD1",idtmed[11],dm,4);
1358   gMC->Gspos("TPEL",1,"TWES",0.,0.,0.,0,"ONLY");
1359
1360
1361   //--------------------------------------------------------------------------
1362   //  End caps
1363   //--------------------------------------------------------------------------
1364
1365   // TPc Main Wheel - Al
1366
1367   dm[0]= 75.3;
1368   dm[1]= 264.8;
1369   dm[2]= 3.0;
1370
1371   gMC->Gsvolu("TPMW","TUBE",idtmed[4],dm,3);
1372
1373   // TPc Extra Wheel (to avoid overlapping) - Al
1374
1375   dm[0]= 264.8;
1376   dm[1]= 277.0;
1377   dm[2]= 1.95;
1378
1379   gMC->Gsvolu("TPEW","TUBE",idtmed[4],dm,3);
1380
1381   //--------------------------------------------------------------------------
1382   //  Tpc Empty Space for the Readout chambers
1383   //--------------------------------------------------------------------------  
1384
1385   Float_t rLow= 86.2;
1386   Float_t rUp= 243.5;
1387   Float_t dR = 0.5*(rUp-rLow);
1388
1389   space= 1.4/cosAlpha; // wheel ribs are 2.8 cm wide
1390
1391   dm[0]= rLow*tanAlpha-space;
1392   dm[1]= rUp*tanAlpha-space;
1393   dm[2]= 3.0;
1394   dm[3]= dR;
1395
1396   gMC->Gsvolu("TESR","TRD1",idtmed[0],dm,4);
1397
1398   // TIC1->TESR
1399
1400
1401   gMC->Gspos("TIC1",1,"TESR",0.,0.75,-dR+23.97,0,"ONLY");
1402
1403
1404   // TOC1->TESR
1405
1406   gMC->Gspos("TOC1",1,"TESR",0.,0.75,dR-55.02,0,"ONLY");
1407
1408   // Tpc Empty Space Bars - Al (daughters of TESR)
1409
1410   Float_t zBar;
1411
1412   gMC->Gsvolu("TESB","TRD1",idtmed[4],dm,0);
1413
1414   // lower bar
1415
1416   dm[0]= rLow*tanAlpha-space;
1417   dm[1]= 88.7*tanAlpha-space;
1418   dm[2]= 0.95;
1419   dm[3]= 1.275;
1420
1421   zBar = -dR+dm[3];
1422
1423   gMC->Gsposp("TESB",1,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1424
1425   // middle bar
1426
1427   dm[0]= 131.65*tanAlpha-space;
1428   dm[1]= 136.5*tanAlpha-space;
1429   dm[3]= 2.425;
1430
1431   zBar = -dR +131.65+dm[3]-rLow;
1432
1433   gMC->Gsposp("TESB",2,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1434
1435   // upper bar
1436
1437   dm[0]= 240.4*tanAlpha-space;
1438   dm[1]= rUp*tanAlpha-space;
1439   dm[3]= 1.55;
1440
1441   zBar = dR-dm[3];
1442
1443   gMC->Gsposp("TESB",3,"TESR",0.,2.05,zBar,0,"ONLY",dm,4);
1444
1445   //  positioning of the empty spaces into the main wheel
1446
1447   Float_t rCenter,xc,yc;
1448   Float_t rInner,rOuter; // center of the inner and outer chamber
1449
1450   rCenter = rLow+dR;
1451
1452   rInner = 108.07;
1453   rOuter = 190.68;
1454
1455   for(Int_t ns=0; ns<nInnerSector;ns++){
1456
1457     phi1 = ns * innerOpenAngle + innerAngleShift;
1458     phi1 *= kRaddeg; // in degrees
1459
1460     phi1 = (Float_t)TMath::Nint(phi1) + 270.;
1461
1462     if (phi1 > 360.) phi1 -= 360.;
1463
1464     theta1 = 90.;
1465     phi2   = 90.;
1466     theta2 = 180.;
1467     phi3   = ns * innerOpenAngle + innerAngleShift;
1468     phi3 *= kRaddeg; // in degrees
1469
1470     phi3 = (Float_t)TMath::Nint(phi3);
1471       
1472     if(phi3 > 360.) phi3 -= 360.;
1473
1474     theta3 = 90.;
1475
1476     // "holes"->End plate
1477
1478     xc = rCenter*TMath::Cos(phi3*kDegrad);
1479     yc = rCenter*TMath::Sin(phi3*kDegrad);
1480
1481     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1482
1483     gMC->Gspos("TESR",ns+1,"TPMW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1484
1485     // TSCE->TSWC (services wheel volumes)
1486
1487     xc = 166.142*TMath::Cos(phi3*kDegrad);
1488     yc = 166.142*TMath::Sin(phi3*kDegrad);
1489
1490     gMC->Gspos("TSCE",ns+1,"TSWC",xc,yc,0.,idrotm[nRotMat],"ONLY");
1491     gMC->Gspos("TWES",ns+1,"TSSW",xc,yc,0.,idrotm[nRotMat],"ONLY");
1492
1493
1494     // readout chambers->TDGS (drift gas)
1495
1496     xc = rInner*TMath::Cos(phi3*kDegrad);
1497     yc = rInner*TMath::Sin(phi3*kDegrad);
1498
1499     gMC->Gspos("TIRC",ns+1,"TDGS",xc,yc,252.,idrotm[nRotMat],"ONLY");
1500      
1501     xc = rOuter*TMath::Cos(phi3*kDegrad);
1502     yc = rOuter*TMath::Sin(phi3*kDegrad);
1503
1504     gMC->Gspos("TORC",ns+1,"TDGS",xc,yc,252.1,idrotm[nRotMat],"ONLY");
1505
1506     nRotMat++;
1507
1508     theta2 = 0.; // reflection
1509
1510     AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1511
1512     xc = rInner*TMath::Cos(phi3*kDegrad);
1513     yc = rInner*TMath::Sin(phi3*kDegrad);
1514
1515     gMC->Gspos("TIRC",ns+nInnerSector+1,"TDGS",xc,yc,-252.,idrotm[nRotMat],"ONLY");
1516
1517     xc = rOuter*TMath::Cos(phi3*kDegrad);
1518     yc = rOuter*TMath::Sin(phi3*kDegrad);
1519
1520     gMC->Gspos("TORC",ns+nOuterSector+1,"TDGS",xc,yc,-252.1,idrotm[nRotMat],"ONLY");
1521
1522     nRotMat++;
1523
1524
1525   } 
1526
1527
1528   // reflection matrix
1529
1530   theta1 = 90.;
1531   phi1   = 0.;
1532   theta2 = 90.;
1533   phi2   = 270.;
1534   theta3 = 180.;
1535   phi3   = 0.;
1536
1537   AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
1538
1539
1540   // TPMW->TPC
1541
1542   gMC->Gspos("TPMW",1,"TPC ",0.,0.,256.6,0,"ONLY");
1543   gMC->Gspos("TPMW",2,"TPC ",0.,0.,-256.6,idrotm[nRotMat],"ONLY");
1544   gMC->Gspos("TPEW",1,"TPC ",0.,0.,257.65,0,"ONLY");
1545   gMC->Gspos("TPEW",2,"TPC ",0.,0.,-257.65,0,"ONLY");
1546
1547
1548
1549   //-------------------------------------------------------
1550   // Tpc High Voltage Membrane - NOMEX honeycomb
1551   //-------------------------------------------------------
1552
1553   dm[0]=0.,
1554   dm[1]=360.;
1555   dm[2]=18.;
1556   dm[3]=2.;
1557
1558   //
1559
1560   dm[4]= -0.3;
1561   dm[5]= 81.156;
1562   dm[6]= 253.386;
1563
1564   //
1565
1566   dm[7]= 0.3;
1567   dm[8]= dm[5];
1568   dm[9]= dm[6];
1569
1570   gMC->Gsvolu("THVM","PGON",idtmed[6],dm,10);
1571
1572   gMC->Gspos("THVM",1,"TDGS",0.,0.,0.,0,"ONLY");
1573
1574   //----------------------------------------------------------
1575   // TPc Support Rods - MAKROLON
1576   //----------------------------------------------------------
1577
1578   dm[0]= 0.9;
1579   dm[1]= 1.2;
1580   dm[2]= 126.65;
1581
1582   gMC->Gsvolu("TPSR","TUBE",idtmed[7],dm,3);
1583
1584   for(Int_t nrod=1;nrod<18;nrod++){
1585     Float_t angle=innerOpenAngle*(Float_t)nrod;
1586
1587     xc=82.4*TMath::Cos(angle);
1588     yc=82.4*TMath::Sin(angle);
1589
1590     gMC->Gspos("TPSR",nrod,"TDGS",xc,yc,126.95,0,"ONLY");
1591     gMC->Gspos("TPSR",nrod+17,"TDGS",xc,yc,-126.95,0,"ONLY");
1592
1593     xc=254.2*TMath::Cos(angle);
1594     yc=254.2*TMath::Sin(angle);
1595
1596     gMC->Gspos("TPSR",nrod+34,"TDGS",xc,yc,126.95,0,"ONLY");
1597     gMC->Gspos("TPSR",nrod+51,"TDGS",xc,yc,-126.95,0,"ONLY");    
1598
1599   }
1600
1601   //----------------------------------------------------------
1602   // Tpc High Voltage rod - MAKROLON + Copper cable
1603   //----------------------------------------------------------
1604
1605   // rod with cable (Left)
1606
1607   dm[0]=0.;
1608   dm[1]=2.25;
1609   dm[2]=126.65;
1610
1611   gMC->Gsvolu("THVL","TUBE",idtmed[7],dm,3);
1612
1613   // HV cable
1614  
1615   dm[0]=0.;
1616   dm[1]=0.3;
1617   dm[2]=126.65;
1618
1619   gMC->Gsvolu("THVC","TUBE",idtmed[10],dm,3);
1620
1621   // empty space
1622
1623   dm[0]=0.3;
1624   dm[1]=1.;
1625   dm[2]=126.65;
1626
1627   gMC->Gsvolu("THVE","TUBE",idtmed[1],dm,3);
1628
1629   gMC->Gspos("THVC",1,"THVL",0.,0.,0.,0,"ONLY");
1630   gMC->Gspos("THVE",1,"THVL",0.,0.,0.,0,"ONLY");
1631
1632   // rod without cable
1633
1634   dm[0]=1.8;
1635   dm[1]=2.25;
1636   dm[2]=126.65;
1637
1638   gMC->Gsvolu("THVR","TUBE",idtmed[7],dm,3);
1639
1640   
1641   
1642   gMC->Gspos("THVL",1,"TDGS",82.4,0.,-126.95,0,"ONLY");
1643   gMC->Gspos("THVL",2,"TDGS",254.2,0.,-126.95,0,"ONLY");
1644
1645   gMC->Gspos("THVR",1,"TDGS",82.4,0.,126.95,0,"ONLY");
1646   gMC->Gspos("THVR",2,"TDGS",254.2,0.,126.95,0,"ONLY");  
1647   
1648
1649
1650   gMC->Gspos("TDGS",1,"TPC ",0.,0.,0.,0,"ONLY"); 
1651
1652   // services wheel cover -> wheel
1653
1654
1655   gMC->Gspos("TSWC",1,"TSSW",0.,0.,4.5,0,"ONLY");
1656   gMC->Gspos("TSWC",2,"TSSW",0.,0.,-4.5,0,"ONLY");
1657
1658
1659   // put the wheel into the TPC
1660
1661   gMC->Gspos("TSSW",1,"TPC ",0.,0.,278.7,0,"ONLY");
1662   gMC->Gspos("TSSW",2,"TPC ",0.,0.,-278.7,0,"ONLY");
1663
1664   gMC->Gsord("TPMW",6);
1665   gMC->Gsord("TSSW",6);
1666   gMC->Gsord("TSWC",6);
1667
1668   // put the TPC into ALIC (main mother volume)
1669
1670   gMC->Gspos("TPC ",1,"ALIC",0.,0.,0.,0,"ONLY");
1671
1672  
1673 } // end of function
1674  
1675 //_____________________________________________________________________________
1676 void AliTPCv3::DrawDetector()
1677 {
1678   //
1679   // Draw a shaded view of the Time Projection Chamber version 1
1680   //
1681
1682
1683   // Set everything unseen
1684   gMC->Gsatt("*", "seen", -1);
1685   // 
1686   // Set ALIC mother transparent
1687   gMC->Gsatt("ALIC","SEEN",0);
1688   //
1689   // Set the volumes visible
1690   //
1691
1692   gMC->Gsatt("TPC ","SEEN",0);
1693   gMC->Gsatt("TOIN","SEEN",1);
1694   gMC->Gsatt("TOIN","COLO",7);
1695   gMC->Gsatt("TPCR","SEEN",0);
1696   gMC->Gsatt("TOCV","SEEN",1);
1697   gMC->Gsatt("TOCV","COLO",4);
1698   gMC->Gsatt("TSA1","SEEN",0);
1699   gMC->Gsatt("TSA2","SEEN",0);
1700   gMC->Gsatt("TSA3","SEEN",0);
1701   gMC->Gsatt("TSA4","SEEN",0);
1702   gMC->Gsatt("TOFC","SEEN",1);
1703   gMC->Gsatt("TOFC","COLO",4);
1704   gMC->Gsatt("TSA5","SEEN",0);
1705   gMC->Gsatt("TSA6","SEEN",0);
1706   gMC->Gsatt("TSA7","SEEN",0);
1707   gMC->Gsatt("TIIN","COLO",7);
1708   gMC->Gsatt("TIIN","SEEN",1);
1709   gMC->Gsatt("TICL","SEEN",0);
1710   gMC->Gsatt("TSA9","SEEN",0);
1711   gMC->Gsatt("TS10","SEEN",0);
1712   gMC->Gsatt("TS11","SEEN",0);
1713   gMC->Gsatt("TS12","SEEN",0);
1714   gMC->Gsatt("TICR","SEEN",0); 
1715   gMC->Gsatt("TS13","SEEN",0);
1716   gMC->Gsatt("TS14","SEEN",0);
1717   gMC->Gsatt("TS15","SEEN",0);
1718   gMC->Gsatt("TS16","SEEN",0);
1719   gMC->Gsatt("TIFC","SEEN",1);
1720   gMC->Gsatt("TIFC","COLO",4); 
1721   gMC->Gsatt("TS17","SEEN",0);
1722   gMC->Gsatt("TS18","SEEN",0);
1723   gMC->Gsatt("TS19","SEEN",0);
1724   gMC->Gsatt("TS21","SEEN",0);
1725   gMC->Gsatt("TS22","SEEN",0);
1726   gMC->Gsatt("TS23","SEEN",0);
1727   gMC->Gsatt("TS24","SEEN",0);
1728   gMC->Gsatt("TDGS","SEEN",0);
1729   gMC->Gsatt("TIRC","SEEN",0);
1730   gMC->Gsatt("TIC1","SEEN",1);
1731   gMC->Gsatt("TIPP","SEEN",0);
1732   gMC->Gsatt("TIC3","SEEN",0);
1733   gMC->Gsatt("TRCE","SEEN",0);
1734   gMC->Gsatt("TPSC","SEEN",0);
1735   gMC->Gsatt("TPCC","SEEN",0);
1736   gMC->Gsatt("TORC","SEEN",0);
1737   gMC->Gsatt("TOPP","SEEN",0);
1738   gMC->Gsatt("TOC3","SEEN",0);
1739   gMC->Gsatt("TOC1","SEEN",1);
1740   gMC->Gsatt("TSSW","SEEN",1);
1741   gMC->Gsatt("TSWC","SEEN",1);
1742   gMC->Gsatt("TSCE","SEEN",1); 
1743   gMC->Gsatt("TSSW","COLO",3);
1744   gMC->Gsatt("TSWC","COLO",3);
1745   gMC->Gsatt("TSCE","COLO",6);
1746   gMC->Gsatt("TWES","SEEN",0);
1747   gMC->Gsatt("TSWB","SEEN",0);
1748   gMC->Gsatt("TPEL","SEEN",0);
1749   gMC->Gsatt("TPMW","SEEN",1);
1750   gMC->Gsatt("TPEW","SEEN",1);
1751   gMC->Gsatt("TESR","SEEN",1);
1752   gMC->Gsatt("TPMW","COLO",12);
1753   gMC->Gsatt("TPEW","COLO",12);
1754   gMC->Gsatt("TWES","COLO",5);
1755   gMC->Gsatt("TIC1","COLO",5);
1756   gMC->Gsatt("TOC1","COLO",5);  
1757   gMC->Gsatt("TESB","SEEN",0);
1758   gMC->Gsatt("TPLS","SEEN",0);
1759   gMC->Gsatt("TPUS","SEEN",0);
1760   gMC->Gsatt("TPSS","SEEN",0);
1761   gMC->Gsatt("THVM","SEEN",1);
1762   gMC->Gsatt("THVM","COLO",11);
1763   gMC->Gsatt("TPSR","SEEN",0);
1764   gMC->Gsatt("THVL","SEEN",0);
1765   gMC->Gsatt("THVC","SEEN",0);
1766   gMC->Gsatt("THVE","SEEN",0);
1767   gMC->Gsatt("THVR","SEEN",0);
1768
1769   //
1770   gMC->Gdopt("hide", "on");
1771   gMC->Gdopt("shad", "on");
1772   gMC->Gsatt("*", "fill", 7);
1773   gMC->SetClipBox(".");
1774   gMC->SetClipBox("TPMW",-300,300,-300,300,254.,270.);
1775   gMC->SetClipBox("TESR",-300,300,-300,300,254.,270.);
1776   gMC->SetClipBox("TSSW",-300,300,-300,300,283.,284.);
1777   gMC->SetClipBox("TSWC",-300,300,-300,300,283.,284.);
1778   gMC->SetClipBox("*", 0, 300, -300, 300, -290, 290);
1779   gMC->DefaultRange();
1780   gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
1781   gMC->Gdhead(1111, "Time Projection Chamber");
1782   gMC->Gdman(18, 4, "MAN");
1783   gMC->Gdopt("hide","off");
1784 }
1785
1786 //_____________________________________________________________________________
1787 void AliTPCv3::CreateMaterials()
1788 {
1789   //
1790   // Define materials for version 2 of the Time Projection Chamber
1791   //
1792
1793
1794   //
1795   AliTPC::CreateMaterials();
1796 }
1797
1798 //_____________________________________________________________________________
1799 void AliTPCv3::Init()
1800 {
1801   //
1802   // Initialises version 3 of the TPC after that it has been built
1803   //
1804   Int_t *idtmed = fIdtmed->GetArray();
1805
1806   AliTPC::Init();
1807
1808   fIdSens=gMC->VolId("TDGS"); // drift gas as a sensitive volume
1809
1810   gMC->SetMaxNStep(30000); // max. number of steps increased
1811
1812   gMC->Gstpar(idtmed[2],"LOSS",5);
1813
1814   printf("*** TPC version 3 initialized ***\n");
1815   printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
1816
1817   //
1818   
1819 }
1820
1821 //_____________________________________________________________________________
1822 void AliTPCv3::StepManager()
1823 {
1824   //
1825   // Called for every step in the Time Projection Chamber
1826   //
1827
1828   //
1829   // parameters used for the energy loss calculations
1830   //
1831   const Float_t kprim = 14.35; // number of primary collisions per 1 cm
1832   const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2
1833   const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation 
1834  
1835  
1836   const Float_t kbig = 1.e10;
1837
1838   Int_t id,copy;
1839   TLorentzVector pos;
1840   Float_t hits[4];
1841   Int_t vol[2];  
1842   TClonesArray &lhits = *fHits;
1843   
1844   vol[1]=0;
1845   vol[0]=0;
1846
1847   //
1848
1849   gMC->SetMaxStep(kbig);
1850   
1851   if(!gMC->IsTrackAlive()) return; // particle has disappeared
1852   
1853   Float_t charge = gMC->TrackCharge();
1854   
1855   if(TMath::Abs(charge)<=0.) return; // take only charged particles
1856   
1857   
1858   id=gMC->CurrentVolID(copy);
1859   
1860   // Check the sensitive volume
1861   
1862   if (id != fIdSens) return;
1863   
1864   //
1865   //  charged particle is in the sensitive volume
1866   //
1867   
1868   if(gMC->TrackStep() > 0) {
1869
1870     
1871     Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1;
1872     nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1873     
1874     gMC->TrackPosition(pos);
1875     hits[0]=pos[0];
1876     hits[1]=pos[1];
1877     hits[2]=pos[2];
1878
1879     //
1880     // check the selected side of the TPC
1881     //
1882  
1883     if(fSide && fSide*hits[2]<=0.) return;
1884
1885     hits[3]=(Float_t)nel;
1886     
1887     // Add this hit
1888    
1889     new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1890     
1891   } 
1892   
1893   // Stemax calculation for the next step
1894   
1895   Float_t pp;
1896   TLorentzVector mom;
1897   gMC->TrackMomentum(mom);
1898   Float_t ptot=mom.Rho();
1899   Float_t betaGamma = ptot/gMC->TrackMass();
1900   
1901   Int_t pid=gMC->TrackPid();
1902   if((pid==kElectron || pid==kPositron) && ptot > 0.002)
1903     { 
1904       pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau!
1905     }
1906   else
1907     {
1908       pp=kprim*BetheBloch(betaGamma);    
1909       if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1910     }
1911   
1912   Float_t random[1];
1913   gMC->Rndm(random,1); // good, old GRNDM from Geant3
1914   
1915   Double_t rnd = (Double_t)random[0];
1916   
1917   gMC->SetMaxStep(-TMath::Log(rnd)/pp);
1918   
1919 }
1920
1921 //_____________________________________________________________________________
1922 Float_t AliTPCv3::BetheBloch(Float_t bg)
1923 {
1924   //
1925   // Bethe-Bloch energy loss formula
1926   //
1927   const Double_t kp1=0.76176e-1;
1928   const Double_t kp2=10.632;
1929   const Double_t kp3=0.13279e-4;
1930   const Double_t kp4=1.8631;
1931   const Double_t kp5=1.9479;
1932
1933   Double_t dbg = (Double_t) bg;
1934
1935   Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1936
1937   Double_t aa = TMath::Power(beta,kp4);
1938   Double_t bb = TMath::Power(1./dbg,kp5);
1939
1940   bb=TMath::Log(kp3+bb);
1941   
1942   return ((Float_t)((kp2-aa-bb)*kp1/aa));
1943 }