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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 | $Log$ | |
e94dd9ca | 18 | Revision 1.12 2000/04/17 09:37:33 kowal2 |
19 | removed obsolete AliTPCDigitsDisplay.C | |
20 | ||
cc80f89e | 21 | Revision 1.11.8.2 2000/04/10 08:36:12 kowal2 |
22 | ||
23 | Updated readout chambers | |
24 | Some modifications to StepManager by M. Kowalski | |
25 | ||
26 | Revision 1.11.8.1 2000/04/10 07:56:53 kowal2 | |
27 | Not used anymore - removed | |
28 | ||
29 | Revision 1.11 1999/11/04 17:28:07 fca | |
30 | Correct barrel part of HV Degrader | |
31 | ||
a5371c42 | 32 | Revision 1.10 1999/10/14 16:52:08 fca |
33 | Only use PDG codes and not GEANT ones | |
34 | ||
69e40cce | 35 | Revision 1.9 1999/10/08 06:27:23 fca |
36 | Corrected bug in the HV degrader geometry, thanks to G.Tabary | |
37 | ||
d183a600 | 38 | Revision 1.8 1999/10/04 13:39:55 fca |
39 | Correct array index problem | |
40 | ||
cdde5b1e | 41 | Revision 1.7 1999/09/29 09:24:34 fca |
42 | Introduction of the Copyright and cvs Log | |
43 | ||
4c039060 | 44 | */ |
45 | ||
4b0fdcad | 46 | /////////////////////////////////////////////////////////////////////////////// |
47 | // // | |
48 | // Time Projection Chamber version 3 -- detailed TPC and slow simulation // | |
49 | // // | |
50 | //Begin_Html | |
51 | /* | |
52 | <img src="picts/AliTPCv3Class.gif"> | |
53 | */ | |
54 | //End_Html | |
55 | // // | |
56 | // // | |
57 | /////////////////////////////////////////////////////////////////////////////// | |
58 | ||
59 | #include <stdlib.h> | |
60 | #include <TMath.h> | |
4b0fdcad | 61 | #include "AliTPCv3.h" |
62 | #include "AliRun.h" | |
63 | #include "AliConst.h" | |
cc80f89e | 64 | #include "AliTPCDigitsArray.h" |
65 | #include"AliTPCParam.h" | |
69e40cce | 66 | #include "AliPDG.h" |
4b0fdcad | 67 | |
68 | ClassImp(AliTPCv3) | |
69 | ||
70 | //_____________________________________________________________________________ | |
71 | AliTPCv3::AliTPCv3(const char *name, const char *title) : | |
72 | AliTPC(name, title) | |
73 | { | |
74 | // | |
cc80f89e | 75 | // Standard constructor for Time Projection Chamber version 3 |
4b0fdcad | 76 | // |
77 | ||
78 | SetBufferSize(128000); | |
79 | } | |
80 | ||
81 | //_____________________________________________________________________________ | |
82 | void AliTPCv3::CreateGeometry() | |
83 | { | |
84 | // | |
cc80f89e | 85 | // Creation of the TPC coarse geometry (version 3) |
86 | // Origin Marek Kowalski Cracow | |
4b0fdcad | 87 | // |
88 | //Begin_Html | |
89 | /* | |
1283eee5 | 90 | <img src="picts/AliTPCv0.gif"> |
4b0fdcad | 91 | */ |
92 | //End_Html | |
93 | //Begin_Html | |
94 | /* | |
1283eee5 | 95 | <img src="picts/AliTPCv0Tree.gif"> |
4b0fdcad | 96 | */ |
97 | //End_Html | |
98 | ||
1283eee5 | 99 | Int_t *idtmed = fIdtmed->GetArray(); |
100 | ||
101 | Float_t dm[21]; | |
62a73ee5 | 102 | Int_t idrotm[120]; |
1283eee5 | 103 | |
104 | Int_t nRotMat = 0; | |
105 | ||
106 | ||
4b0fdcad | 107 | // ---------------------------------------------------- |
1283eee5 | 108 | // FIELD CAGE WITH ENDCAPS - G10 |
4b0fdcad | 109 | // THIS IS ALSO A TPC MOTHER VOLUME |
110 | // ---------------------------------------------------- | |
1283eee5 | 111 | |
4b0fdcad | 112 | dm[0] = 76.; |
113 | dm[1] = 278.; | |
114 | dm[2] = 275.; | |
1283eee5 | 115 | |
116 | gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3); | |
117 | ||
118 | //----------------------------------------------------- | |
119 | // Endcap cover c-fibre 0.86% X0 | |
120 | //----------------------------------------------------- | |
121 | ||
122 | dm[0] = 78.; | |
123 | dm[1] = 258.; | |
124 | dm[2] = 0.95; | |
125 | ||
126 | gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3); | |
127 | ||
128 | //----------------------------------------------------- | |
129 | // Drift gas , leave 2 cm at the outer radius | |
130 | // and inner raddius | |
131 | //----------------------------------------------------- | |
132 | ||
133 | dm[0] = 78.; | |
134 | dm[1] = 258.; | |
4b0fdcad | 135 | dm[2] = 250.; |
136 | ||
1283eee5 | 137 | gMC->Gsvolu("TGAS", "TUBE", idtmed[4], dm, 3); |
138 | ||
4b0fdcad | 139 | |
1283eee5 | 140 | //------------------------------------------------------ |
141 | // membrane holder - carbon fiber | |
142 | //------------------------------------------------------ | |
143 | ||
144 | ||
145 | gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0); | |
146 | ||
147 | dm[0] = 252.; | |
148 | dm[1] = 258.; | |
149 | dm[2] = 0.2; | |
150 | ||
151 | gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3); | |
152 | ||
153 | dm[0] = 78.; | |
cdde5b1e | 154 | dm[1] = 82.; |
1283eee5 | 155 | dm[2] = 0.1; |
156 | ||
157 | gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3); | |
158 | ||
159 | //---------------------------------------------------------- | |
160 | // HV membrane - 25 microns of mylar | |
161 | //---------------------------------------------------------- | |
162 | ||
163 | dm[0] = 82.; | |
164 | dm[1] = 252.; | |
165 | dm[2] = 0.00125; | |
166 | ||
167 | gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3); | |
168 | ||
169 | gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY"); | |
170 | ||
171 | gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY"); | |
172 | ||
173 | //---------------------------------------------------------- | |
174 | // "side" gas volume, the same as the drift gas | |
175 | // the readout chambers are placed there. | |
176 | //---------------------------------------------------------- | |
177 | ||
178 | dm[0] = 78.; | |
179 | dm[1] = 258.; | |
180 | dm[2] = 0.5*(275. - 250.); | |
181 | ||
182 | gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3); | |
183 | ||
184 | Float_t z_side = dm[2]; // 1/2 of the side gas thickness | |
185 | ||
186 | //----------------------------------------------------------- | |
187 | // Readout chambers , 25% of X0, I use Al as the material | |
188 | //----------------------------------------------------------- | |
189 | ||
190 | Float_t InnerOpenAngle = fTPCParam->GetInnerAngle(); | |
191 | Float_t OuterOpenAngle = fTPCParam->GetOuterAngle(); | |
192 | ||
193 | Float_t InnerAngleShift = fTPCParam->GetInnerAngleShift(); | |
194 | Float_t OuterAngleShift = fTPCParam->GetOuterAngleShift(); | |
195 | ||
196 | ||
197 | Int_t nInnerSector = fTPCParam->GetNInnerSector()/2; | |
198 | Int_t nOuterSector = fTPCParam->GetNOuterSector()/2; | |
199 | ||
200 | ||
cc80f89e | 201 | Float_t InSecLowEdge = fTPCParam->GetInnerRadiusLow(); |
202 | Float_t InSecUpEdge = fTPCParam->GetInnerRadiusUp(); | |
1283eee5 | 203 | |
cc80f89e | 204 | Float_t OuSecLowEdge = fTPCParam->GetOuterRadiusLow(); |
205 | Float_t OuSecUpEdge = fTPCParam->GetOuterRadiusUp(); | |
1283eee5 | 206 | |
207 | Float_t SecThick = 2.225; // Al | |
208 | ||
cc80f89e | 209 | Float_t LowEdge = fTPCParam->GetInnerFrameSpace(); |
1283eee5 | 210 | |
211 | // S (Inner) sectors | |
212 | ||
cc80f89e | 213 | dm[0] = InSecLowEdge*TMath::Tan(0.5*InnerOpenAngle)-LowEdge; |
214 | dm[1] = InSecUpEdge*TMath::Tan(0.5*InnerOpenAngle)-LowEdge; | |
1283eee5 | 215 | dm[2] = SecThick; |
216 | dm[3] = 0.5*(InSecUpEdge-InSecLowEdge); | |
217 | ||
218 | Float_t xCenterS = InSecLowEdge+dm[3]; | |
219 | ||
220 | gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4); | |
221 | ||
222 | // L (Outer) sectors | |
223 | ||
cc80f89e | 224 | Float_t UpEdge = fTPCParam->GetOuterFrameSpace(); |
225 | ||
226 | dm[0] = OuSecLowEdge*TMath::Tan(0.5*OuterOpenAngle)-UpEdge; | |
227 | dm[1] = OuSecUpEdge*TMath::Tan(0.5*OuterOpenAngle)-UpEdge; | |
1283eee5 | 228 | dm[2] = SecThick; |
229 | dm[3] = 0.5*(OuSecUpEdge-OuSecLowEdge); | |
230 | ||
231 | Float_t xCenterL = OuSecLowEdge+dm[3]; | |
232 | ||
233 | gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4); | |
234 | ||
235 | Float_t z1 = -z_side + SecThick*0.5; | |
236 | ||
237 | //------------------------------------------------------------------ | |
238 | // Positioning of the S-sector readout chambers | |
239 | //------------------------------------------------------------------ | |
240 | ||
241 | Int_t ns; | |
242 | Float_t theta1,theta2,theta3; | |
243 | Float_t phi1,phi2,phi3; | |
244 | Float_t alpha; | |
245 | Float_t x,y; | |
246 | ||
247 | for(ns=0;ns<nInnerSector;ns++){ | |
248 | ||
249 | phi1 = ns * InnerOpenAngle + 270.*kDegrad + InnerAngleShift; | |
250 | phi1 *= kRaddeg; // in degrees | |
251 | ||
252 | phi1 = (Float_t)TMath::Nint(phi1); | |
253 | ||
254 | if (phi1 > 360.) phi1 -= 360.; | |
255 | ||
4b0fdcad | 256 | theta1 = 90.; |
257 | phi2 = 90.; | |
258 | theta2 = 180.; | |
1283eee5 | 259 | phi3 = ns * InnerOpenAngle + InnerAngleShift; |
260 | phi3 *= kRaddeg; // in degrees | |
261 | ||
262 | phi3 = (Float_t)TMath::Nint(phi3); | |
263 | ||
264 | if(phi3 > 360.) phi3 -= 360.; | |
265 | ||
4b0fdcad | 266 | theta3 = 90.; |
1283eee5 | 267 | |
268 | alpha = phi3*kDegrad; | |
269 | ||
270 | x = xCenterS * TMath::Cos(alpha); | |
271 | y = xCenterS * TMath::Sin(alpha); | |
272 | ||
273 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); | |
274 | ||
275 | gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY"); | |
276 | ||
277 | nRotMat++; | |
278 | ||
279 | } | |
4b0fdcad | 280 | |
1283eee5 | 281 | //------------------------------------------------------------------- |
282 | // Positioning of the L-sectors readout chambers | |
283 | //------------------------------------------------------------------- | |
4b0fdcad | 284 | |
1283eee5 | 285 | for(ns=0;ns<nOuterSector;ns++){ |
286 | phi1 = ns * OuterOpenAngle + 270.*kDegrad + OuterAngleShift; | |
287 | phi1 *= kRaddeg; // in degrees | |
288 | ||
289 | phi1 = (Float_t)TMath::Nint(phi1); | |
4b0fdcad | 290 | |
1283eee5 | 291 | |
292 | if (phi1 > 360.) phi1 -= 360.; | |
293 | ||
4b0fdcad | 294 | theta1 = 90.; |
295 | phi2 = 90.; | |
296 | theta2 = 180.; | |
1283eee5 | 297 | phi3 = ns * OuterOpenAngle+OuterAngleShift; |
298 | phi3 *= kRaddeg; // in degrees | |
299 | ||
300 | phi3 = (Float_t)TMath::Nint(phi3); | |
301 | ||
302 | ||
303 | if(phi3 > 360.) phi3 -= 360.; | |
304 | ||
4b0fdcad | 305 | theta3 = 90.; |
1283eee5 | 306 | |
307 | alpha = phi3*kDegrad; | |
308 | ||
309 | x = xCenterL * TMath::Cos(alpha); | |
310 | y = xCenterL * TMath::Sin(alpha); | |
311 | ||
312 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); | |
313 | ||
314 | ||
315 | gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY"); | |
316 | ||
317 | nRotMat++; | |
318 | ||
4b0fdcad | 319 | } |
1283eee5 | 320 | |
321 | Float_t z0 = z_side - 0.95; | |
322 | ||
323 | gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY"); | |
324 | ||
4b0fdcad | 325 | // ========================================================== |
326 | // wheels | |
327 | // ========================================================== | |
1283eee5 | 328 | |
329 | // | |
330 | // auxilary structures | |
331 | // | |
332 | ||
333 | ||
334 | gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air" | |
335 | ||
4b0fdcad | 336 | // ---------------------------------------------------------- |
337 | // Large wheel -> positioned in the TPC | |
338 | // ---------------------------------------------------------- | |
1283eee5 | 339 | |
340 | ||
341 | z0 = 263.5; // TPC length - 1/2 spoke wheel width | |
342 | ||
343 | dm[0] = 258.; | |
4b0fdcad | 344 | dm[1] = 278.; |
345 | dm[2] = 11.5; | |
4b0fdcad | 346 | |
1283eee5 | 347 | gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3); |
348 | ||
349 | dm[0] = dm[0]+2.; | |
350 | dm[1] = 278.; | |
351 | dm[2] = dm[2]-2.; | |
352 | ||
353 | gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3); | |
354 | ||
355 | gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY"); | |
356 | gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY"); | |
357 | ||
358 | // | |
359 | // Outer vessel + CO2 HV degrader | |
360 | // | |
361 | ||
362 | dm[0] = 260.; | |
363 | dm[1] = 278.; | |
364 | dm[2] = 252.; | |
365 | ||
366 | gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3); | |
367 | ||
368 | dm[0] = 275.; | |
4b0fdcad | 369 | dm[1] = 278.; |
4b0fdcad | 370 | |
1283eee5 | 371 | gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3); |
372 | ||
373 | gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY"); | |
374 | ||
375 | ||
1283eee5 | 376 | |
377 | gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY"); | |
378 | ||
379 | ||
380 | //---------------------------------------------------------- | |
381 | // Small wheel -> positioned in "side gas | |
382 | //---------------------------------------------------------- | |
383 | ||
384 | dm[0] = 78.; | |
4b0fdcad | 385 | dm[1] = 82.; |
386 | dm[2] = 11.5; | |
1283eee5 | 387 | |
388 | gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3); | |
389 | ||
390 | dm[0] = 78.; | |
391 | dm[1] = dm[1]-2; | |
392 | dm[2] = dm[2]-2.; | |
393 | ||
394 | gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3); | |
4b0fdcad | 395 | |
1283eee5 | 396 | gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY"); |
397 | ||
398 | z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas" | |
399 | ||
400 | gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY"); | |
401 | ||
402 | ||
403 | // to avoid overlaps | |
404 | ||
405 | dm[0] = 76.; | |
406 | dm[1] = 78.; | |
407 | dm[2] = 11.5; | |
408 | ||
409 | gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3); | |
410 | ||
4b0fdcad | 411 | dm[2] = 9.5; |
1283eee5 | 412 | |
413 | gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3); | |
414 | ||
415 | gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY"); | |
416 | ||
417 | z0= 263.5; | |
4b0fdcad | 418 | |
1283eee5 | 419 | gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY"); |
420 | gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY"); | |
421 | ||
422 | // G10 plug | |
423 | ||
424 | dm[0] = 76.; | |
7d7bb9e5 | 425 | dm[1] = 78.; |
426 | dm[2] = 1.; | |
1283eee5 | 427 | |
428 | gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3); | |
429 | ||
430 | z0 = 251.; | |
431 | ||
432 | gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY"); | |
433 | gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY"); | |
434 | ||
435 | ||
436 | //--------------------------------------------------------- | |
437 | // central wheel 6 (radial direction) x 4 (along z) cm2 | |
438 | //--------------------------------------------------------- | |
439 | ||
440 | dm[0] = 140.; | |
441 | dm[1] = 146.; | |
4b0fdcad | 442 | dm[2] = 2.; |
4b0fdcad | 443 | |
1283eee5 | 444 | gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3); |
445 | ||
446 | dm[0] = dm[0] + 2.; | |
447 | dm[1] = dm[1] - 2.; | |
448 | dm[2] = dm[2] - 1.; | |
449 | ||
450 | gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3); | |
451 | ||
452 | z0 = z_side - 1.9 - 2.; | |
453 | ||
454 | gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY"); | |
455 | ||
456 | // | |
457 | ||
458 | gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke | |
459 | ||
460 | ||
461 | //--------------------------------------------------------- | |
462 | // inner spokes (nSectorInner) | |
463 | //--------------------------------------------------------- | |
464 | ||
465 | dm[0] = 0.5*(139.9-82.1); | |
4b0fdcad | 466 | dm[1] = 3.; |
467 | dm[2] = 2.; | |
1283eee5 | 468 | |
469 | Float_t x1 = dm[0]+82.; | |
470 | ||
471 | gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3); | |
472 | ||
473 | dm[1] = dm[1]-1.; | |
474 | dm[2] = dm[2]-1.; | |
475 | ||
476 | gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3); | |
477 | ||
478 | for(ns=0;ns<nInnerSector;ns++){ | |
479 | ||
480 | phi1 = 0.5*InnerOpenAngle + ns*InnerOpenAngle + InnerAngleShift; | |
481 | theta1=90.; | |
482 | phi1 *=kRaddeg; | |
483 | ||
484 | phi1 = (Float_t)TMath::Nint(phi1); | |
485 | ||
486 | phi2 = phi1+90.; | |
487 | if(phi2>360.) phi2 -= 360.; | |
488 | theta2=90.; | |
489 | phi3=0.; | |
490 | theta3=0.; | |
491 | ||
4b0fdcad | 492 | alpha = phi1 * kDegrad; |
493 | x = x1 * TMath::Cos(alpha); | |
1283eee5 | 494 | y = x1 * TMath::Sin(alpha); |
495 | ||
496 | AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3); | |
497 | ||
498 | gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY"); | |
499 | ||
500 | nRotMat++; | |
501 | ||
4b0fdcad | 502 | } |
1283eee5 | 503 | |
504 | //------------------------------------------------------------- | |
505 | // outer spokes (nSectorOuter) | |
506 | //------------------------------------------------------------- | |
507 | ||
508 | dm[0] = 0.5*(257.9-146.1); | |
509 | dm[1] = 3.; | |
510 | dm[2] = 2.; | |
511 | ||
512 | x1 = dm[0] + 146.; | |
513 | ||
514 | gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3); | |
515 | ||
516 | dm[1] = dm[1] - 1.; | |
517 | dm[2] = dm[2] - 1.; | |
518 | ||
519 | gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3); | |
520 | ||
521 | for(ns=0;ns<nOuterSector;ns++){ | |
522 | ||
523 | phi1 = 0.5*OuterOpenAngle + ns*OuterOpenAngle + OuterAngleShift; | |
524 | theta1=90.; | |
525 | phi1 *=kRaddeg; | |
526 | ||
527 | phi1 = (Float_t)TMath::Nint(phi1); | |
528 | ||
529 | phi2 = phi1+90.; | |
530 | if(phi2>360.) phi2 -= 360.; | |
531 | theta2=90.; | |
532 | phi3=0.; | |
533 | theta3=0.; | |
534 | ||
4b0fdcad | 535 | alpha = phi1 * kDegrad; |
1283eee5 | 536 | x = x1 * TMath::Cos(alpha); |
537 | y = x1 * TMath::Sin(alpha); | |
538 | ||
539 | AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3); | |
540 | ||
541 | gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY"); | |
542 | ||
543 | nRotMat++; | |
544 | ||
545 | } | |
4b0fdcad | 546 | |
1283eee5 | 547 | |
4b0fdcad | 548 | |
4b0fdcad | 549 | // -------------------------------------------------------- |
550 | // put the readout chambers into the TPC | |
551 | // -------------------------------------------------------- | |
1283eee5 | 552 | |
4b0fdcad | 553 | theta1 = 90.; |
554 | phi1 = 0.; | |
555 | theta2 = 90.; | |
556 | phi2 = 270.; | |
557 | theta3 = 180.; | |
558 | phi3 = 0.; | |
559 | ||
1283eee5 | 560 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
4b0fdcad | 561 | |
562 | z0 = z_side + 250.; | |
563 | ||
564 | gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY"); | |
1283eee5 | 565 | gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY"); |
4b0fdcad | 566 | |
567 | gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY"); | |
1283eee5 | 568 | |
569 | //---------------------------------------------------- | |
570 | // Inner vessel and HV degrader | |
571 | //---------------------------------------------------- | |
572 | ||
4b0fdcad | 573 | dm[0] = 0.; |
574 | dm[1] = 360.; | |
575 | dm[2] = 4.; | |
576 | ||
577 | dm[3] = -250.; | |
1283eee5 | 578 | dm[4] = 74.4; |
4b0fdcad | 579 | dm[5] = 76.; |
1283eee5 | 580 | |
4b0fdcad | 581 | dm[6] = -64.5; |
582 | dm[7] = 50.; | |
583 | dm[8] = 76.; | |
1283eee5 | 584 | |
d183a600 | 585 | dm[9] = 64.5; |
4b0fdcad | 586 | dm[10] = 50.; |
587 | dm[11] = 76.; | |
1283eee5 | 588 | |
4b0fdcad | 589 | dm[12] = 250.; |
1283eee5 | 590 | dm[13] = 74.4; |
4b0fdcad | 591 | dm[14] = 76.; |
1283eee5 | 592 | |
593 | gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2 | |
594 | ||
595 | // cone parts | |
596 | ||
4b0fdcad | 597 | dm[0] = 0.; |
598 | dm[1] = 360.; | |
1283eee5 | 599 | dm[2] = 2.; |
600 | ||
601 | dm[3] = 64.5; | |
602 | dm[4] = 50.; | |
603 | dm[5] = 51.6; | |
604 | ||
605 | dm[6] = 250.; | |
606 | dm[7] = 74.4; | |
607 | dm[8] = 76.; | |
608 | ||
609 | ||
610 | gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre | |
611 | ||
612 | gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY"); | |
613 | gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY"); | |
614 | ||
615 | // barrel part | |
616 | ||
617 | dm[0] = 50.; | |
618 | dm[1] = 50.5; | |
a5371c42 | 619 | dm[2] = 64.5; |
1283eee5 | 620 | |
621 | gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3); | |
622 | ||
623 | gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY"); | |
624 | ||
625 | gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY"); | |
626 | ||
4b0fdcad | 627 | |
1283eee5 | 628 | |
4b0fdcad | 629 | |
1283eee5 | 630 | |
4b0fdcad | 631 | // --------------------------------------------------- |
632 | // volumes ordering | |
633 | // --------------------------------------------------- | |
634 | gMC->Gsord("TPSG", 6); | |
1283eee5 | 635 | |
636 | } // end of function | |
637 | ||
4b0fdcad | 638 | |
639 | ||
640 | //_____________________________________________________________________________ | |
641 | void AliTPCv3::DrawDetector() | |
642 | { | |
643 | // | |
644 | // Draw a shaded view of the Time Projection Chamber version 1 | |
645 | // | |
646 | ||
647 | ||
648 | // Set everything unseen | |
649 | gMC->Gsatt("*", "seen", -1); | |
650 | // | |
651 | // Set ALIC mother transparent | |
652 | gMC->Gsatt("ALIC","SEEN",0); | |
653 | // | |
654 | // Set the volumes visible | |
655 | gMC->Gsatt("TPC","SEEN",0); | |
656 | gMC->Gsatt("TGAS","SEEN",0); | |
657 | gMC->Gsatt("TPSG","SEEN",0); | |
658 | gMC->Gsatt("TPHV","SEEN",1); | |
1283eee5 | 659 | gMC->Gsatt("TPMH","SEEN",1); |
660 | gMC->Gsatt("TPEC","SEEN",0); | |
4b0fdcad | 661 | gMC->Gsatt("TRCS","SEEN",1); |
662 | gMC->Gsatt("TRCL","SEEN",1); | |
1283eee5 | 663 | gMC->Gsatt("TPWL","SEEN",1); |
664 | gMC->Gsatt("TPWI","SEEN",1); | |
665 | gMC->Gsatt("TPWS","SEEN",1); | |
4b0fdcad | 666 | gMC->Gsatt("TPW1","SEEN",1); |
1283eee5 | 667 | gMC->Gsatt("TPS1","SEEN",1); |
668 | gMC->Gsatt("TPS2","SEEN",1); | |
669 | gMC->Gsatt("TPG1","SEEN",1); | |
670 | gMC->Gsatt("TPG2","SEEN",1); | |
671 | gMC->Gsatt("TPWC","SEEN",1); | |
672 | gMC->Gsatt("TPSI","SEEN",1); | |
673 | gMC->Gsatt("TPSO","SEEN",1); | |
674 | gMC->Gsatt("TPCO","SEEN",1); | |
675 | gMC->Gsatt("TPOV","SEEN",1); | |
4b0fdcad | 676 | gMC->Gsatt("TPVD","SEEN",1); |
677 | // | |
678 | gMC->Gdopt("hide", "on"); | |
679 | gMC->Gdopt("shad", "on"); | |
680 | gMC->Gsatt("*", "fill", 7); | |
681 | gMC->SetClipBox("."); | |
682 | gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000); | |
683 | gMC->DefaultRange(); | |
684 | gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025); | |
685 | gMC->Gdhead(1111, "Time Projection Chamber"); | |
686 | gMC->Gdman(18, 4, "MAN"); | |
687 | gMC->Gdopt("hide","off"); | |
688 | } | |
689 | ||
690 | //_____________________________________________________________________________ | |
691 | void AliTPCv3::CreateMaterials() | |
692 | { | |
693 | // | |
694 | // Define materials for version 2 of the Time Projection Chamber | |
695 | // | |
696 | ||
697 | ||
698 | // | |
699 | // Increase maximum number of steps | |
700 | gMC->SetMaxNStep(30000); | |
701 | // | |
702 | AliTPC::CreateMaterials(); | |
703 | } | |
704 | ||
705 | //_____________________________________________________________________________ | |
706 | void AliTPCv3::Init() | |
707 | { | |
708 | // | |
709 | // Initialises version 3 of the TPC after that it has been built | |
710 | // | |
711 | Int_t *idtmed = fIdtmed->GetArray()-399; | |
712 | ||
713 | AliTPC::Init(); | |
714 | ||
715 | fIdSens1=gMC->VolId("TGAS"); // drift gas as a sensitive volume | |
716 | ||
717 | gMC->SetMaxNStep(30000); // max. number of steps increased | |
718 | ||
719 | gMC->Gstpar(idtmed[403],"LOSS",5); | |
720 | ||
721 | printf("*** TPC version 3 initialized ***\n"); | |
722 | printf("Maximum number of steps = %d\n",gMC->GetMaxNStep()); | |
723 | ||
724 | // | |
725 | ||
726 | } | |
727 | ||
728 | //_____________________________________________________________________________ | |
729 | void AliTPCv3::StepManager() | |
730 | { | |
731 | // | |
732 | // Called for every step in the Time Projection Chamber | |
733 | // | |
734 | ||
735 | // | |
736 | // parameters used for the energy loss calculations | |
737 | // | |
738 | const Float_t prim = 14.35; // number of primary collisions per 1 cm | |
739 | const Float_t poti = 20.77e-9; // first ionization potential for Ne/CO2 | |
740 | const Float_t w_ion = 35.97e-9; // energy for the ion-electron pair creation | |
741 | ||
742 | ||
743 | const Float_t big = 1.e10; | |
744 | ||
745 | Int_t id,copy; | |
746 | TLorentzVector pos; | |
747 | Float_t hits[4]; | |
748 | Int_t vol[2]; | |
749 | TClonesArray &lhits = *fHits; | |
750 | ||
751 | vol[1]=0; | |
752 | vol[0]=0; | |
753 | ||
754 | // | |
755 | ||
756 | gMC->SetMaxStep(big); | |
757 | ||
758 | if(!gMC->IsTrackAlive()) return; // particle has disappeared | |
759 | ||
760 | Float_t charge = gMC->TrackCharge(); | |
761 | ||
762 | if(TMath::Abs(charge)<=0.) return; // take only charged particles | |
763 | ||
764 | ||
765 | id=gMC->CurrentVolID(copy); | |
766 | ||
767 | // Check the sensitive volume | |
768 | ||
769 | if (id != fIdSens1) return; | |
770 | ||
771 | // | |
772 | // charged particle is in the sensitive volume | |
773 | // | |
774 | ||
775 | if(gMC->TrackStep() > 0) { | |
776 | ||
777 | ||
778 | Int_t nel = (Int_t)(((gMC->Edep())-poti)/w_ion) + 1; | |
779 | nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV | |
780 | ||
781 | gMC->TrackPosition(pos); | |
782 | hits[0]=pos[0]; | |
783 | hits[1]=pos[1]; | |
784 | hits[2]=pos[2]; | |
785 | ||
786 | // | |
787 | // check the selected side of the TPC | |
788 | // | |
789 | ||
790 | if(fSide && fSide*hits[2]<=0.) return; | |
791 | ||
792 | hits[3]=(Float_t)nel; | |
793 | ||
794 | // Add this hit | |
795 | ||
796 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); | |
797 | ||
798 | } | |
799 | ||
800 | // Stemax calculation for the next step | |
801 | ||
802 | Float_t pp; | |
803 | TLorentzVector mom; | |
804 | gMC->TrackMomentum(mom); | |
805 | Float_t ptot=mom.Rho(); | |
806 | Float_t beta_gamma = ptot/gMC->TrackMass(); | |
807 | ||
69e40cce | 808 | Int_t pid=gMC->TrackPid(); |
cc80f89e | 809 | if((pid==kElectron || pid==kPositron) && ptot > 0.002) |
4b0fdcad | 810 | { |
811 | pp = prim*1.58; // electrons above 20 MeV/c are on the plateau! | |
812 | } | |
813 | else | |
814 | { | |
815 | pp=prim*BetheBloch(beta_gamma); | |
816 | if(TMath::Abs(charge) > 1.) pp *= (charge*charge); | |
817 | } | |
818 | ||
819 | Float_t random[1]; | |
820 | gMC->Rndm(random,1); // good, old GRNDM from Geant3 | |
821 | ||
822 | Double_t rnd = (Double_t)random[0]; | |
823 | ||
824 | gMC->SetMaxStep(-TMath::Log(rnd)/pp); | |
825 | ||
826 | } | |
827 | ||
828 | //_____________________________________________________________________________ | |
829 | Float_t AliTPCv3::BetheBloch(Float_t bg) | |
830 | { | |
831 | // | |
832 | // Bethe-Bloch energy loss formula | |
833 | // | |
834 | const Double_t p1=0.76176e-1; | |
835 | const Double_t p2=10.632; | |
836 | const Double_t p3=0.13279e-4; | |
837 | const Double_t p4=1.8631; | |
838 | const Double_t p5=1.9479; | |
839 | ||
840 | Double_t dbg = (Double_t) bg; | |
841 | ||
842 | Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg); | |
843 | ||
844 | Double_t aa = TMath::Power(beta,p4); | |
845 | Double_t bb = TMath::Power(1./dbg,p5); | |
846 | ||
847 | bb=TMath::Log(p3+bb); | |
848 | ||
849 | return ((Float_t)((p2-aa-bb)*p1/aa)); | |
850 | } |