Update for the new version of the TPC
[u/mrichter/AliRoot.git] / TPC / AliTPCv2.cxx
CommitLineData
4c039060 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$Log$
69e40cce 18Revision 1.17 1999/10/08 06:27:23 fca
19Corrected bug in the HV degrader geometry, thanks to G.Tabary
20
d183a600 21Revision 1.16 1999/10/04 13:39:54 fca
22Correct array index problem
23
cdde5b1e 24Revision 1.15 1999/09/29 09:24:34 fca
25Introduction of the Copyright and cvs Log
26
4c039060 27*/
28
fe4da5cc 29///////////////////////////////////////////////////////////////////////////////
30// //
31// Time Projection Chamber version 2 -- detailed TPC and slow simulation //
32// //
33//Begin_Html
34/*
1439f98e 35<img src="picts/AliTPCv2Class.gif">
fe4da5cc 36*/
37//End_Html
38// //
39// //
40///////////////////////////////////////////////////////////////////////////////
2a49965d 41#include <stdlib.h>
fe4da5cc 42
43#include <TMath.h>
bcac8ae4 44
fe4da5cc 45#include "AliTPCv2.h"
bcac8ae4 46#include "AliTPCD.h"
fe4da5cc 47#include "AliRun.h"
fe4da5cc 48#include "AliConst.h"
69e40cce 49#include "AliPDG.h"
8c555625 50
fe4da5cc 51ClassImp(AliTPCv2)
52
53//_____________________________________________________________________________
54AliTPCv2::AliTPCv2(const char *name, const char *title) :
55 AliTPC(name, title)
56{
57 //
58 // Standard constructor for Time Projection Chamber version 2
59 //
60 fIdSens1=0;
61 fIdSens2=0;
62 SetBufferSize(128000);
63}
64
65//_____________________________________________________________________________
66void AliTPCv2::CreateGeometry()
67{
68 //
69 // Create the geometry of Time Projection Chamber version 2
70 //
71 //Begin_Html
72 /*
1439f98e 73 <img src="picts/AliTPCv2.gif">
fe4da5cc 74 */
75 //End_Html
76 //Begin_Html
77 /*
1439f98e 78 <img src="picts/AliTPCv2Tree.gif">
fe4da5cc 79 */
80 //End_Html
81
8c555625 82 AliTPCParam * fTPCParam = &(fDigParam->GetParam());
83
1283eee5 84 Int_t *idtmed = fIdtmed->GetArray();
85
86 Float_t dm[21];
62a73ee5 87 Int_t idrotm[120];
1283eee5 88
89 Int_t nRotMat = 0;
90
91 Int_t i,ifl1,ifl2;
92
93 Int_t nInnerSector = fTPCParam->GetNInnerSector()/2;
94 Int_t nOuterSector = fTPCParam->GetNOuterSector()/2;
fe4da5cc 95
96 // ---------------------------------------------------
97 // sector specification check
98 // ---------------------------------------------------
99 if (fSecAL >= 0) {
100 ifl1 = 0;
101
102 for (i = 0; i < 6; ++i) {
1283eee5 103 if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) {
fe4da5cc 104 ifl1 = 1;
105 printf("*** SECTOR %d selected\n",fSecLows[i]);
106 }
107 }
108
109 } else {
110 printf("*** ALL LOWER SECTORS SELECTED ***\n");
8c555625 111 ifl1 = 1;
fe4da5cc 112 }
113
114 if (fSecAU >= 0) {
115 ifl2 = 0;
116
117 for (i = 0; i < 12; ++i) {
1283eee5 118 if (fSecUps[i] > 2*nInnerSector-1 &&
119 fSecUps[i] < 2*(nInnerSector+nOuterSector)) {
fe4da5cc 120 ifl2 = 1;
121 printf("*** SECTOR %d selected\n",fSecUps[i]);
122 }
123 }
124
125 } else {
126 printf("*** ALL UPPER SECTORS SELECTED ***\n");
8c555625 127 ifl1 = 1;
fe4da5cc 128 }
129
130 if (ifl1 == 0 && ifl2 == 0) {
131 printf("*** ERROR: AT LEAST ONE SECTOR MUST BE SPECIFIED ***\n");
132 printf("!!! PROGRAM STOPPED !!!\n");
133 exit(1);
134 }
135
136 if ((fSecAL < 0 || fSecAU < 0) && fSens >= 0) {
137 printf("** ERROR: STRIPS CANNOT BE SPECIFIED FOR ALL SECTORS **\n");
138 printf("!!! PROGRAM STOPPED !!!\n");
139 exit(1);
140 }
1283eee5 141
fe4da5cc 142 // ----------------------------------------------------
1283eee5 143 // FIELD CAGE WITH ENDCAPS - G10
fe4da5cc 144 // THIS IS ALSO A TPC MOTHER VOLUME
145 // ----------------------------------------------------
1283eee5 146
fe4da5cc 147 dm[0] = 76.;
148 dm[1] = 278.;
149 dm[2] = 275.;
1283eee5 150
151 gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3);
152
153 //-----------------------------------------------------
154 // Endcap cover c-fibre 0.86% X0
155 //-----------------------------------------------------
156
157 dm[0] = 78.;
158 dm[1] = 258.;
159 dm[2] = 0.95;
160
161 gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3);
162
163 //-----------------------------------------------------
164 // Drift gas , leave 2 cm at the outer radius
165 // and inner raddius
166 //-----------------------------------------------------
167
168 dm[0] = 78.;
169 dm[1] = 258.;
fe4da5cc 170 dm[2] = 250.;
1283eee5 171
172 gMC->Gsvolu("TGAS", "TUBE", idtmed[3], dm, 3);
173
174 //------------------------------------------------------
175 // membrane holder - carbon fiber
176 //------------------------------------------------------
177
178
179 gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0);
180
181 dm[0] = 252.;
182 dm[1] = 258.;
183 dm[2] = 0.2;
184
185 gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
186
187 dm[0] = 78.;
cdde5b1e 188 dm[1] = 82.;
1283eee5 189 dm[2] = 0.1;
190
191 gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3);
192
193 //----------------------------------------------------------
194 // HV membrane - 25 microns of mylar
195 //----------------------------------------------------------
196
197 dm[0] = 82.;
198 dm[1] = 252.;
199 dm[2] = 0.00125;
200
201 gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3);
202
203 gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY");
204
205 gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY");
206
207 //----------------------------------------------------------
208 // "side" gas volume, the same as the drift gas
209 // the readout chambers are placed there.
210 //----------------------------------------------------------
211
212 dm[0] = 78.;
213 dm[1] = 258.;
214 dm[2] = 0.5*(275. - 250.);
215
216 gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3);
217
218 Float_t z_side = dm[2]; // 1/2 of the side gas thickness
219
220 //-----------------------------------------------------------
221 // Readout chambers , 25% of X0, I use Al as the material
222 //-----------------------------------------------------------
223
224 Float_t InnerOpenAngle = fTPCParam->GetInnerAngle();
225 Float_t OuterOpenAngle = fTPCParam->GetOuterAngle();
226
227 Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift();
228 Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift();
229
230 Float_t InSecLowEdge = fTPCParam->GetInSecLowEdge();
231 Float_t InSecUpEdge = fTPCParam->GetInSecUpEdge();
232
233 Float_t OuSecLowEdge = fTPCParam->GetOuSecLowEdge();
234 Float_t OuSecUpEdge = fTPCParam->GetOuSecUpEdge();
235
236
237 Float_t SecThick = 2.225; // Al
238
239 Float_t edge = fTPCParam->GetEdge();
240
241 // S (Inner) sectors
242
243 dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
244 dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-edge;
245 dm[2] = 0.5*SecThick;
246 dm[3] = 0.5*(InSecUpEdge-InSecLowEdge);
247
248 Float_t xCenterS = InSecLowEdge+dm[3];
249
250 gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4);
251
252 // L (Outer) sectors
253
254 dm[0] = OuSecLowEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
255 dm[1] = OuSecUpEdge*TMath::Tan(0.5*OuterOpenAngle)-edge;
256 dm[2] = 0.5*SecThick;
257 dm[3] = 0.5*(OuSecUpEdge-OuSecLowEdge);
258
259 Float_t xCenterL = OuSecLowEdge+dm[3];
260
261 gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4);
262
263 Float_t z1 = -z_side + SecThick*0.5;
264
265 //------------------------------------------------------------------
266 // S sectors - "gas sectors" (TRD1)
267 //------------------------------------------------------------------
268
269 dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-0.01;
270 dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-0.01;
271 dm[2] = 0.5*(250. - 0.001);
272 dm[3] = 0.5*(InSecUpEdge-InSecLowEdge);
273
274 gMC->Gsvolu("TSGA", "TRD1", idtmed[4], dm, 4); // sensitive
275
fe4da5cc 276 // -------------------------------------------------------------
277 // Only for the debugging purpose and resolution calculation
278 // Sensitive strips at the pad-row center
279 // -------------------------------------------------------------
1283eee5 280
281 Int_t ns;
282
283 if(fSens>=0){
284
285 Float_t r1,r2,zz;
286
287 Float_t StripThick = 0.01; // 100 microns
288 Float_t dead = fTPCParam->GetDeadZone();
289
290 gMC->Gsvolu("TSST", "TRD1", idtmed[4], dm, 0);
291
292 dm[2] = 0.5*(250. - 0.002);
293 dm[3] = 0.5 * StripThick;
294
295
296 for (ns = 0; ns < fTPCParam->GetNRowLow(); ns++) {
297
298 r1 = fTPCParam->GetPadRowRadiiLow(ns);
299 r2 = r1 + StripThick;
300 dm[0] = r1 * TMath::Tan(0.5*InnerOpenAngle) - dead;
301 dm[1] = r2 * TMath::Tan(0.5*InnerOpenAngle) - dead;
302
303 zz = -InSecLowEdge -0.5*(InSecUpEdge-InSecLowEdge);
304 zz += r1;
305 zz += dm[3];
306
307 gMC->Gsposp("TSST", ns+1, "TSGA", 0., 0., zz, 0, "ONLY", dm, 4);
308
fe4da5cc 309
1283eee5 310 }
311
312 gMC->Gsord("TSGA", 3);
313
314 } // if strips selected
315
316
317 //-----------------------------------------------------------------
318 // L sectors - "gas sectors" (PGON to avoid overlaps)
319 //-----------------------------------------------------------------
320
321 dm[0] = 360.*kDegrad - 0.5*OuterOpenAngle;
322 dm[0] *= kRaddeg;
323 dm[0] = (Float_t)TMath::Nint(dm[0]);
324
325 dm[1] = OuterOpenAngle*kRaddeg;
326 dm[1] = (Float_t)TMath::Nint(dm[1]);
327
328 dm[2] = 1.;
329 dm[3] = 4.;
330
331 dm[4] = 0.002;
332 dm[5] = OuSecLowEdge;
333 dm[6] = 252.*TMath::Cos(0.5*OuterOpenAngle)-0.002;
334
335 dm[7] = dm[4]+0.2;
336 dm[8] = dm[5];
337 dm[9] = dm[6];
338
339 dm[10] = dm[7];
340 dm[11] = OuSecLowEdge;
341 dm[12] = OuSecUpEdge;
342
343 dm[13] = 250.;
344 dm[14] = dm[11];
345 dm[15] = dm[12];
346
347 gMC->Gsvolu("TLGA","PGON",idtmed[4],dm,16);
8c555625 348
fe4da5cc 349 if (fSens >= 0) {
fe4da5cc 350
1283eee5 351 Float_t rmax = dm[6];
352 Float_t r1,r2;
353 Float_t dead = fTPCParam->GetDeadZone();
8c555625 354
1283eee5 355 Float_t StripThick = 0.01; // 100 microns
8c555625 356
1283eee5 357 gMC->Gsvolu("TLST", "PGON", idtmed[4], dm, 0);
358
359 dm[0] = 360.*kDegrad - 0.5*OuterOpenAngle;
360 dm[0] *= kRaddeg;
361 dm[0] = (Float_t)TMath::Nint(dm[0]);
362
363 dm[1] = OuterOpenAngle*kRaddeg;
364 dm[1] = (Float_t)TMath::Nint(dm[1]);
8c555625 365
fe4da5cc 366 dm[2] = 1.;
1283eee5 367 dm[3] = 2.;
fe4da5cc 368
1283eee5 369 dm[7] = 250.;
fe4da5cc 370
1283eee5 371 Float_t xx = dead/TMath::Tan(0.5*OuterOpenAngle);
fe4da5cc 372
1283eee5 373 for(ns=0;ns<fTPCParam->GetNRowUp();ns++){
fe4da5cc 374
1283eee5 375 r1 = fTPCParam->GetPadRowRadiiUp(ns)-xx;
376 r2 = r1 + StripThick;
377
378 dm[5] = r1;
379 dm[6] = r2;
380
381 dm[8] = r1;
382 dm[9] = r2;
383
384 if(r2+xx < rmax){
385 dm[4] = 0.002;
fe4da5cc 386 }
1283eee5 387 else{
388 dm[4] = 0.202;
389 }
390
391 gMC->Gsposp("TLST",ns+1,"TLGA",xx,0.,0.,0,"ONLY",dm,10);
392
393 }
394
62a73ee5 395 gMC->Gsord("TLGA", 4);
1283eee5 396
397 } // if strips selected
398
399 //------------------------------------------------------------------
400 // Positioning of the S-sector readout chambers
401 //------------------------------------------------------------------
402
403 Float_t zs = 0.5*(250.+0.002);
404
405 Float_t theta1,theta2,theta3;
406 Float_t phi1,phi2,phi3;
407 Float_t alpha;
408 Float_t x,y;
409
410 for(ns=0;ns<nInnerSector;ns++){
411
412 phi1 = ns * InnerOpenAngle + 270.*kDegrad + InnerAngleShift;
413 phi1 *= kRaddeg; // in degrees
414
415 phi1 = (Float_t)TMath::Nint(phi1);
416
417 if (phi1 > 360.) phi1 -= 360.;
fe4da5cc 418
1283eee5 419 theta1 = 90.;
420 phi2 = 90.;
421 theta2 = 180.;
422 phi3 = ns * InnerOpenAngle + InnerAngleShift;
423 phi3 *= kRaddeg; // in degrees
424
425 phi3 = (Float_t)TMath::Nint(phi3);
fe4da5cc 426
1283eee5 427 if(phi3 > 360.) phi3 -= 360.;
428
429 theta3 = 90.;
430
431 alpha = phi3*kDegrad;
432
433 x = xCenterS * TMath::Cos(alpha);
434 y = xCenterS * TMath::Sin(alpha);
435
436 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
437
438 gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
439
440 if(fSecAL < 0){
441
442 //---------------------------------------------------------------
443 // position all sectors
444 //---------------------------------------------------------------
445
446 gMC->Gspos("TSGA",ns+1,"TGAS",x,y,zs,idrotm[nRotMat], "ONLY");
447 gMC->Gspos("TSGA",ns+1+nInnerSector,"TGAS",x,y,-zs,idrotm[nRotMat], "ONLY");
fe4da5cc 448 }
1283eee5 449
450 else{
451
452 //---------------------------------------------------------------
453 // position selected sectors
454 //---------------------------------------------------------------
455
456 for(Int_t sel=0;sel<6;sel++){
457
458 if(fSecLows[sel] == ns){
459 gMC->Gspos("TSGA", ns+1, "TGAS", x, y, zs, idrotm[nRotMat], "ONLY");
460 }
461 else if(fSecLows[sel] == ns+nInnerSector){
462 gMC->
463 Gspos("TSGA",ns+1+nInnerSector,"TGAS", x, y,-zs,idrotm[nRotMat],"ONLY");
464 }
fe4da5cc 465 }
fe4da5cc 466 }
1283eee5 467
468 nRotMat++;
469
470 }
fe4da5cc 471
1283eee5 472 //-------------------------------------------------------------------
473 // Positioning of the L-sectors readout chambers
474 //-------------------------------------------------------------------
fe4da5cc 475
1283eee5 476 for(ns=0;ns<nOuterSector;ns++){
477 phi1 = ns * OuterOpenAngle + 270.*kDegrad + OuterAngleShift;
478 phi1 *= kRaddeg; // in degrees
479
480 phi1 = (Float_t)TMath::Nint(phi1);
fe4da5cc 481
1283eee5 482
483 if (phi1 > 360.) phi1 -= 360.;
484
fe4da5cc 485 theta1 = 90.;
1283eee5 486 phi2 = 90.;
487 theta2 = 180.;
488 phi3 = ns * OuterOpenAngle+OuterAngleShift;
489 phi3 *= kRaddeg; // in degrees
fe4da5cc 490
1283eee5 491 phi3 = (Float_t)TMath::Nint(phi3);
fe4da5cc 492
1283eee5 493
494 if(phi3 > 360.) phi3 -= 360.;
495
496 theta3 = 90.;
497
498 alpha = phi3*kDegrad;
499
500 x = xCenterL * TMath::Cos(alpha);
501 y = xCenterL * TMath::Sin(alpha);
502
503 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
504
505
506 gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY");
507
508 nRotMat++;
509
510 }
511
512 //-------------------------------------------------------------------
513 // Positioning of the L-sectors (gas sectors)
514 //-------------------------------------------------------------------
515
516 for(ns=0;ns<nOuterSector;ns++){
517
518 phi1 = ns*OuterOpenAngle + OuterAngleShift;
519 phi1 *= kRaddeg;
fe4da5cc 520
1283eee5 521 phi1 = (Float_t)TMath::Nint(phi1);
522 if(phi1>360.) phi1 -= 360.;
523
524 theta1 = 90.;
525
526 phi2 = 90. + phi1;
527 if(phi2>360.) phi2 -= 360.;
528
529 theta2 = 90.;
530
531 phi3 = 0.;
532 theta3 = 0.;
533
534 if(fSecAU < 0) {
535
536 //--------------------------------------------------------------
537 // position all sectors
538 //--------------------------------------------------------------
539
540 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
541
542 gMC->Gspos("TLGA",ns+1,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY");
543
544 nRotMat++;
545
546 // reflection !!
547
548 phi3 = 0.;
549 theta3 = 180.;
550
551 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
552
553 gMC->Gspos("TLGA",ns+1+nOuterSector,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY");
554
555 nRotMat++;
556 }
557
558 else{
559
560 //---------------------------------------------------------------
561 // position selected sectors
562 //---------------------------------------------------------------
563
564 for(Int_t sel=0;sel<12;sel++){
565
566 if(fSecUps[sel] == ns+2*nInnerSector){
567
568 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
569 gMC->Gspos("TLGA",ns+1,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY");
570 nRotMat++;
571
572 }
573 else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){
574
575 // reflection
576
577 phi3 = 0.;
578 theta3 = 180.;
579
580 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
581 gMC->
582 Gspos("TLGA",ns+1+nOuterSector,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY");
583 nRotMat++;
584
585 }
586
587 }
588
589 }
590
591 }
592
593 Float_t z0 = z_side - 0.95;
594
595 gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY");
596
597 // ==========================================================
598 // wheels
599 // ==========================================================
600
601 //
602 // auxilary structures
603 //
604
605
606 gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air"
607
608 // ----------------------------------------------------------
609 // Large wheel -> positioned in the TPC
610 // ----------------------------------------------------------
611
612
613 z0 = 263.5; // TPC length - 1/2 spoke wheel width
614
615 dm[0] = 258.;
616 dm[1] = 278.;
617 dm[2] = 11.5;
618
619 gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3);
620
621 dm[0] = dm[0]+2.;
622 dm[1] = 278.;
623 dm[2] = dm[2]-2.;
624
625 gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3);
626
627 gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY");
628 gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY");
629
630 //
631 // Outer vessel + CO2 HV degrader
632 //
633
634 dm[0] = 260.;
635 dm[1] = 278.;
636 dm[2] = 252.;
637
638 gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3);
639
640 dm[0] = 275.;
641 dm[1] = 278.;
642
643 gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3);
644
645 gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY");
646
647
648 // G10 plugs
649
650 dm[0] = 258.;
651 dm[1] = 260.;
652 dm[2] = 1.;
653
654 gMC->Gsvolu("TPG1","TUBE",idtmed[8],dm,3);
655 gMC->Gspos("TPG1",1,"TPCO",0.,0.,251.,0,"ONLY");
656 gMC->Gspos("TPG1",2,"TPCO",0.,0.,-251.,0,"ONLY");
657
658 gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY");
659
660
661 //----------------------------------------------------------
662 // Small wheel -> positioned in "side gas
663 //----------------------------------------------------------
664
665 dm[0] = 78.;
666 dm[1] = 82.;
667 dm[2] = 11.5;
668
669 gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3);
670
671 dm[0] = 78.;
672 dm[1] = dm[1]-2;
673 dm[2] = dm[2]-2.;
674
675 gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3);
676
677 gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY");
678
679 z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas"
680
681 gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY");
682
683
684 // to avoid overlaps
685
686 dm[0] = 76.;
687 dm[1] = 78.;
688 dm[2] = 11.5;
689
690 gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3);
691
692 dm[2] = 9.5;
693
694 gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3);
695
696 gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY");
697
698 z0= 263.5;
699
700 gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY");
701 gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY");
702
703 // G10 plug
704
705 dm[0] = 76.;
7d7bb9e5 706 dm[1] = 78.;
707 dm[2] = 1.;
1283eee5 708
709 gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3);
710
711 z0 = 251.;
712
713 gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY");
714 gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY");
715
716
717 //---------------------------------------------------------
718 // central wheel 6 (radial direction) x 4 (along z) cm2
719 //---------------------------------------------------------
720
721 dm[0] = 140.;
722 dm[1] = 146.;
723 dm[2] = 2.;
724
725 gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3);
726
727 dm[0] = dm[0] + 2.;
728 dm[1] = dm[1] - 2.;
729 dm[2] = dm[2] - 1.;
730
731 gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3);
732
733 z0 = z_side - 1.9 - 2.;
734
735 gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY");
736
737 //
738
739 gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke
740
741
742 //---------------------------------------------------------
743 // inner spokes (nSectorInner)
744 //---------------------------------------------------------
745
746 dm[0] = 0.5*(139.9-82.1);
747 dm[1] = 3.;
748 dm[2] = 2.;
749
750 Float_t x1 = dm[0]+82.;
751
752 gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3);
753
754 dm[1] = dm[1]-1.;
755 dm[2] = dm[2]-1.;
756
757 gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3);
758
759 for(ns=0;ns<nInnerSector;ns++){
760
761 phi1 = 0.5*InnerOpenAngle + ns*InnerOpenAngle + InnerAngleShift;
762 theta1=90.;
763 phi1 *=kRaddeg;
764
765 phi1 = (Float_t)TMath::Nint(phi1);
766 if(phi1>360.) phi1 -= 360.;
767
768 phi2 = phi1+90.;
769 if(phi2>360.) phi2 -= 360.;
770 theta2=90.;
771 phi3=0.;
772 theta3=0.;
773
774 alpha = phi1 * kDegrad;
775 x = x1 * TMath::Cos(alpha);
776 y = x1 * TMath::Sin(alpha);
777
778 AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
779
780 gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
781
782 nRotMat++;
783
784 }
785
786 //-------------------------------------------------------------
787 // outer spokes (nSectorOuter)
788 //-------------------------------------------------------------
789
790 dm[0] = 0.5*(257.9-146.1);
791 dm[1] = 3.;
792 dm[2] = 2.;
793
794 x1 = dm[0] + 146.;
795
796 gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3);
797
798 dm[1] = dm[1] - 1.;
799 dm[2] = dm[2] - 1.;
800
801 gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3);
802
803 for(ns=0;ns<nOuterSector;ns++){
804
805 phi1 = 0.5*OuterOpenAngle + ns*OuterOpenAngle + OuterAngleShift;
806 theta1=90.;
807 phi1 *=kRaddeg;
808
809 phi1 = (Float_t)TMath::Nint(phi1);
810 if(phi1>360.) phi1 -= 360.;
811
812 phi2 = phi1+90.;
813 if(phi2>360.) phi2 -= 360.;
814 theta2=90.;
815 phi3=0.;
816 theta3=0.;
817
818 alpha = phi1 * kDegrad;
819 x = x1 * TMath::Cos(alpha);
820 y = x1 * TMath::Sin(alpha);
821
822 AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3);
823
824 gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY");
825
826 nRotMat++;
827
828 }
829
830
831
832 // --------------------------------------------------------
833 // put the readout chambers into the TPC
834 // --------------------------------------------------------
835
836 theta1 = 90.;
837 phi1 = 0.;
838 theta2 = 90.;
839 phi2 = 270.;
840 theta3 = 180.;
841 phi3 = 0.;
842
843 AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3);
844
845 z0 = z_side + 250.;
846
847 gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY");
848 gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY");
849
850 gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY");
851
852 //----------------------------------------------------
853 // Inner vessel and HV degrader
854 //----------------------------------------------------
855
856 dm[0] = 0.;
857 dm[1] = 360.;
858 dm[2] = 4.;
859
860 dm[3] = -250.;
861 dm[4] = 74.4;
862 dm[5] = 76.;
863
864 dm[6] = -64.5;
865 dm[7] = 50.;
866 dm[8] = 76.;
867
d183a600 868 dm[9] = 64.5;
1283eee5 869 dm[10] = 50.;
870 dm[11] = 76.;
871
872 dm[12] = 250.;
873 dm[13] = 74.4;
874 dm[14] = 76.;
875
876 gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2
877
878 // cone parts
879
880 dm[0] = 0.;
881 dm[1] = 360.;
882 dm[2] = 2.;
883
884 dm[3] = 64.5;
885 dm[4] = 50.;
886 dm[5] = 51.6;
887
888 dm[6] = 250.;
889 dm[7] = 74.4;
890 dm[8] = 76.;
891
892
893 gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre
894
895 gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY");
896 gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY");
897
898 // barrel part
899
900 dm[0] = 50.;
901 dm[1] = 50.5;
902 dm[2] = 32.25;
903
904 gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3);
905
906 gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY");
907
908 gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY");
909
910
911 // ---------------------------------------------------
912 // volumes ordering
913 // ---------------------------------------------------
914
915 gMC->Gsord("TGAS", 6);
916 gMC->Gsord("TPSG", 6);
917
918
919
920} // end of function
fe4da5cc 921
922//_____________________________________________________________________________
8c555625 923void AliTPCv2::DrawDetector()
fe4da5cc 924{
925 //
926 // Draw a shaded view of the Time Projection Chamber version 1
927 //
928
fe4da5cc 929 // Set everything unseen
cfce8870 930 gMC->Gsatt("*", "seen", -1);
fe4da5cc 931 //
932 // Set ALIC mother transparent
cfce8870 933 gMC->Gsatt("ALIC","SEEN",0);
fe4da5cc 934 //
935 // Set the volumes visible
cfce8870 936 gMC->Gsatt("TPC","SEEN",0);
937 gMC->Gsatt("TGAS","SEEN",0);
938 gMC->Gsatt("TPSG","SEEN",0);
939 gMC->Gsatt("TPHV","SEEN",1);
1283eee5 940 gMC->Gsatt("TPMH","SEEN",1);
941 gMC->Gsatt("TPEC","SEEN",0);
cfce8870 942 gMC->Gsatt("TRCS","SEEN",1);
943 gMC->Gsatt("TRCL","SEEN",1);
1283eee5 944 gMC->Gsatt("TPWL","SEEN",1);
945 gMC->Gsatt("TPWI","SEEN",1);
946 gMC->Gsatt("TPWS","SEEN",1);
cfce8870 947 gMC->Gsatt("TPW1","SEEN",1);
1283eee5 948 gMC->Gsatt("TPS1","SEEN",1);
949 gMC->Gsatt("TPS2","SEEN",1);
950 gMC->Gsatt("TPG1","SEEN",1);
951 gMC->Gsatt("TPG2","SEEN",1);
952 gMC->Gsatt("TPWC","SEEN",1);
953 gMC->Gsatt("TPSI","SEEN",1);
954 gMC->Gsatt("TPSO","SEEN",1);
955 gMC->Gsatt("TPCO","SEEN",1);
956 gMC->Gsatt("TPOV","SEEN",1);
cfce8870 957 gMC->Gsatt("TPVD","SEEN",1);
fe4da5cc 958 //
cfce8870 959 gMC->Gdopt("hide", "on");
960 gMC->Gdopt("shad", "on");
961 gMC->Gsatt("*", "fill", 7);
962 gMC->SetClipBox(".");
963 gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000);
964 gMC->DefaultRange();
965 gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025);
966 gMC->Gdhead(1111, "Time Projection Chamber");
967 gMC->Gdman(18, 4, "MAN");
968 gMC->Gdopt("hide","off");
fe4da5cc 969}
970
971//_____________________________________________________________________________
972void AliTPCv2::CreateMaterials()
973{
974 //
975 // Define materials for version 2 of the Time Projection Chamber
976 //
977
fe4da5cc 978 //
979 // Increase maximum number of steps
cfce8870 980 gMC->SetMaxNStep(30000);
fe4da5cc 981 //
982 AliTPC::CreateMaterials();
983}
984
985//_____________________________________________________________________________
986void AliTPCv2::Init()
987{
988 //
989 // Initialises version 2 of the TPC after that it has been built
990 //
ad51aeb0 991 Int_t *idtmed = fIdtmed->GetArray()-399;
fe4da5cc 992 AliTPC::Init();
cfce8870 993 fIdSens1=gMC->VolId("TLGA"); // L-sector
994 fIdSens2=gMC->VolId("TSGA"); // S-sector
995 fIdSens3=gMC->VolId("TSST"); // strip - S-sector (not always used)
996 fIdSens4=gMC->VolId("TLST"); // strip - S-sector (not always used)
fe4da5cc 997
cfce8870 998 gMC->SetMaxNStep(30000); // max. number of steps increased
fe4da5cc 999
cfce8870 1000 gMC->Gstpar(idtmed[403],"LOSS",5);
fe4da5cc 1001
1002 printf("*** TPC version 2 initialized ***\n");
cfce8870 1003 printf("Maximum number of steps = %d\n",gMC->GetMaxNStep());
fe4da5cc 1004
1005 //
1006
1007}
1008
1009//_____________________________________________________________________________
1010void AliTPCv2::StepManager()
1011{
1012 //
1013 // Called for every step in the Time Projection Chamber
1014 //
1015
1016 //
1017 // parameters used for the energy loss calculations
1018 //
62a73ee5 1019 const Float_t prim = 14.35; // number of primary collisions per 1 cm
1020 const Float_t poti = 20.77e-9; // first ionization potential for Ne/CO2
1021 const Float_t w_ion = 35.97e-9; // energy for the ion-electron pair creation
8022212f 1022
1023 // const Float_t prim = 17.65;
1024 // const Float_t poti = 19.02e-9;
1025 // const Float_t w_ion = 33.06e-9;
fe4da5cc 1026
1027
1028 const Float_t big = 1.e10;
1029
1030 Int_t id,copy;
1031 Float_t hits[4];
1032 Int_t vol[2];
1033 TClonesArray &lhits = *fHits;
0a6d8768 1034 TLorentzVector pos;
1283eee5 1035
1036 AliTPCParam *fTPCParam = &(fDigParam->GetParam());
fe4da5cc 1037
1038 vol[1]=0;
1039
1040 //
1041
cfce8870 1042 gMC->SetMaxStep(big);
fe4da5cc 1043
0a6d8768 1044 if(!gMC->IsTrackAlive()) return; // particle has disappeared
fe4da5cc 1045
cfce8870 1046 Float_t charge = gMC->TrackCharge();
fe4da5cc 1047
1048 if(TMath::Abs(charge)<=0.) return; // take only charged particles
1049
1050
0a6d8768 1051 id=gMC->CurrentVolID(copy);
fe4da5cc 1052
1053 // Check the sensitive volume
1054
1055 if(id == fIdSens1)
1056 {
1283eee5 1057 vol[0] = copy + fTPCParam->GetNInnerSector()-1; // L-sector number
fe4da5cc 1058 }
1059 else if(id == fIdSens2)
1060 {
1283eee5 1061 vol[0] = copy-1; // S-sector number
fe4da5cc 1062 }
0a6d8768 1063 else if(id == fIdSens3 && gMC->IsTrackEntering())
fe4da5cc 1064 {
1283eee5 1065 vol[1] = copy-1; // row number
0a6d8768 1066 id = gMC->CurrentVolOffID(1,copy);
1283eee5 1067 vol[0] = copy-1; // sector number (S-sector)
fe4da5cc 1068
0a6d8768 1069 gMC->TrackPosition(pos);
1070 hits[0]=pos[0];
1071 hits[1]=pos[1];
1072 hits[2]=pos[2];
fe4da5cc 1073 hits[3]=0.; // this hit has no energy loss
1074 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1075 }
0a6d8768 1076 else if(id == fIdSens4 && gMC->IsTrackEntering())
fe4da5cc 1077 {
1283eee5 1078 vol[1] = copy-1; // row number
0a6d8768 1079 id = gMC->CurrentVolOffID(1,copy);
1283eee5 1080 vol[0] = copy+fTPCParam->GetNInnerSector()-1; // sector number (L-sector)
fe4da5cc 1081
0a6d8768 1082 gMC->TrackPosition(pos);
1083 hits[0]=pos[0];
1084 hits[1]=pos[1];
1085 hits[2]=pos[2];
fe4da5cc 1086 hits[3]=0.; // this hit has no energy loss
1087 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1088 }
1089 else return;
1090
1091 //
1092 // charged particle is in the sensitive volume
1093 //
1094
cfce8870 1095 if(gMC->TrackStep() > 0) {
fe4da5cc 1096
cfce8870 1097 Int_t nel = (Int_t)(((gMC->Edep())-poti)/w_ion) + 1;
fe4da5cc 1098 nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV
1099
0a6d8768 1100 gMC->TrackPosition(pos);
1101 hits[0]=pos[0];
1102 hits[1]=pos[1];
1103 hits[2]=pos[2];
fe4da5cc 1104 hits[3]=(Float_t)nel;
1105
1106 // Add this hit
1107
1108 new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits);
1109
1110 }
1111
1112 // Stemax calculation for the next step
1113
1114 Float_t pp;
0a6d8768 1115 TLorentzVector mom;
1116 gMC->TrackMomentum(mom);
1117 Float_t ptot=mom.Rho();
1118 Float_t beta_gamma = ptot/gMC->TrackMass();
fe4da5cc 1119
69e40cce 1120 Int_t pid=gMC->TrackPid();
1121 if((pid==kElectron || pid==kPositron || pid==kGamma) && ptot > 0.002)
fe4da5cc 1122 {
1123 pp = prim*1.58; // electrons above 20 MeV/c are on the plateau!
1124 }
1125 else
1126 {
1127 pp=prim*BetheBloch(beta_gamma);
1128 if(TMath::Abs(charge) > 1.) pp *= (charge*charge);
1129 }
1130
1131 Float_t random[1];
cfce8870 1132 gMC->Rndm(random,1); // good, old GRNDM from Geant3
fe4da5cc 1133
1134 Double_t rnd = (Double_t)random[0];
1135
cfce8870 1136 gMC->SetMaxStep(-TMath::Log(rnd)/pp);
fe4da5cc 1137
1138}
1139
1140//_____________________________________________________________________________
1141Float_t AliTPCv2::BetheBloch(Float_t bg)
1142{
1143 //
1144 // Bethe-Bloch energy loss formula
1145 //
1146 const Double_t p1=0.76176e-1;
1147 const Double_t p2=10.632;
1148 const Double_t p3=0.13279e-4;
1149 const Double_t p4=1.8631;
1150 const Double_t p5=1.9479;
1151
1152 Double_t dbg = (Double_t) bg;
1153
1154 Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg);
1155
1156 Double_t aa = TMath::Power(beta,p4);
1157 Double_t bb = TMath::Power(1./dbg,p5);
1158
1159 bb=TMath::Log(p3+bb);
1160
1161 return ((Float_t)((p2-aa-bb)*p1/aa));
1162}