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1 | /////////////////////////////////////////////////////////////////////////////// | |
2 | // // | |
3 | // Time Projection Chamber version 2 -- detailed TPC and slow simulation // | |
4 | // // | |
5 | //Begin_Html | |
6 | /* | |
7 | <img src="picts/AliTPCv2Class.gif"> | |
8 | */ | |
9 | //End_Html | |
10 | // // | |
11 | // // | |
12 | /////////////////////////////////////////////////////////////////////////////// | |
13 | #include <stdlib.h> | |
14 | ||
15 | #include <TMath.h> | |
16 | ||
17 | #include "AliTPCv2.h" | |
18 | #include "AliTPCD.h" | |
19 | #include "AliRun.h" | |
20 | #include "AliConst.h" | |
21 | ||
22 | ClassImp(AliTPCv2) | |
23 | ||
24 | //_____________________________________________________________________________ | |
25 | AliTPCv2::AliTPCv2(const char *name, const char *title) : | |
26 | AliTPC(name, title) | |
27 | { | |
28 | // | |
29 | // Standard constructor for Time Projection Chamber version 2 | |
30 | // | |
31 | fIdSens1=0; | |
32 | fIdSens2=0; | |
33 | SetBufferSize(128000); | |
34 | } | |
35 | ||
36 | //_____________________________________________________________________________ | |
37 | void AliTPCv2::CreateGeometry() | |
38 | { | |
39 | // | |
40 | // Create the geometry of Time Projection Chamber version 2 | |
41 | // | |
42 | //Begin_Html | |
43 | /* | |
44 | <img src="picts/AliTPCv2.gif"> | |
45 | */ | |
46 | //End_Html | |
47 | //Begin_Html | |
48 | /* | |
49 | <img src="picts/AliTPCv2Tree.gif"> | |
50 | */ | |
51 | //End_Html | |
52 | ||
53 | Int_t *idtmed = fIdtmed->GetArray()-399; | |
54 | ||
55 | AliTPCParam * fTPCParam = &(fDigParam->GetParam()); | |
56 | ||
57 | Float_t tana; | |
58 | Int_t isll; | |
59 | Float_t rlsl, wlsl, rssl, rlsu, wssl, wlsu, rssu, wssu; | |
60 | Int_t i; | |
61 | Float_t alpha, x, y, z, sec_thick; | |
62 | ||
63 | Float_t r1, r2, x1, z0, z1, x2, theta1, theta2, theta3, dm[21]; | |
64 | Int_t il, iu; | |
65 | Float_t z_side, zz; | |
66 | Int_t idrotm[100]; | |
67 | ||
68 | Float_t x0l, x0u; | |
69 | Int_t idr; | |
70 | Float_t thl, opl; | |
71 | Int_t ils, iss; | |
72 | Float_t thu, opu; | |
73 | Int_t ifl1 = 0, ifl2 = 0; | |
74 | Float_t phi1, phi2, phi3; | |
75 | ||
76 | // --------------------------------------------------- | |
77 | // sector specification check | |
78 | // --------------------------------------------------- | |
79 | if (fSecAL >= 0) { | |
80 | ifl1 = 0; | |
81 | ||
82 | for (i = 0; i < 6; ++i) { | |
83 | if (fSecLows[i] > 0 && fSecLows[i] <25) { | |
84 | ifl1 = 1; | |
85 | printf("*** SECTOR %d selected\n",fSecLows[i]); | |
86 | } | |
87 | } | |
88 | ||
89 | } else { | |
90 | printf("*** ALL LOWER SECTORS SELECTED ***\n"); | |
91 | ifl1 = 1; | |
92 | } | |
93 | ||
94 | if (fSecAU >= 0) { | |
95 | ifl2 = 0; | |
96 | ||
97 | for (i = 0; i < 12; ++i) { | |
98 | if (fSecUps[i] > 24 && fSecUps[i] < 73) { | |
99 | ifl2 = 1; | |
100 | printf("*** SECTOR %d selected\n",fSecUps[i]); | |
101 | } | |
102 | } | |
103 | ||
104 | } else { | |
105 | printf("*** ALL UPPER SECTORS SELECTED ***\n"); | |
106 | ifl1 = 1; | |
107 | } | |
108 | ||
109 | if (ifl1 == 0 && ifl2 == 0) { | |
110 | printf("*** ERROR: AT LEAST ONE SECTOR MUST BE SPECIFIED ***\n"); | |
111 | printf("!!! PROGRAM STOPPED !!!\n"); | |
112 | exit(1); | |
113 | } | |
114 | ||
115 | if ((fSecAL < 0 || fSecAU < 0) && fSens >= 0) { | |
116 | printf("** ERROR: STRIPS CANNOT BE SPECIFIED FOR ALL SECTORS **\n"); | |
117 | printf("!!! PROGRAM STOPPED !!!\n"); | |
118 | exit(1); | |
119 | } | |
120 | // ---------------------------------------------------- | |
121 | // FIELD CAGE WITH ENDCAPS - CARBON FIBER | |
122 | // THIS IS ALSO A TPC MOTHER VOLUME | |
123 | // ---------------------------------------------------- | |
124 | dm[0] = 76.; | |
125 | dm[1] = 278.; | |
126 | dm[2] = 275.; | |
127 | ||
128 | gMC->Gsvolu("TPC ", "TUBE", idtmed[407], dm, 3); | |
129 | // ------------------------------------------------------- | |
130 | // drift gas Ne/CO2 (90/10 volume) - nonsensitive | |
131 | // field cage thickness = 0.52% X0 | |
132 | // ---------------------------------------------------- | |
133 | dm[0] = 76.+0.09776; | |
134 | dm[1] = 257.; | |
135 | dm[2] = 250.; | |
136 | ||
137 | gMC->Gsvolu("TGAS", "TUBE", idtmed[402], dm, 3); | |
138 | // ------------------------------------------------------ | |
139 | // "side" gas volume (the same as drift gas), | |
140 | // here the readout chambers are positioned | |
141 | // ------------------------------------------------------ | |
142 | dm[2] = 0.5*(275.-250.); | |
143 | z_side = dm[2]; | |
144 | ||
145 | gMC->Gsvolu("TPSG", "TUBE", idtmed[401], dm, 3); | |
146 | // ------------------------------------------------------ | |
147 | // HV midplane - 20 microns of mylar | |
148 | // ----------------------------------------------------- | |
149 | dm[2] = .001; | |
150 | ||
151 | gMC->Gsvolu("TPHV", "TUBE", idtmed[405], dm, 3); | |
152 | ||
153 | // ==================================================== | |
154 | // lower and upper readout chambers | |
155 | // ==================================================== | |
156 | // sectros opening angles in degrees | |
157 | // --------------------------------------------------- | |
158 | opl = 30.; | |
159 | opu = 15.; | |
160 | thl = TMath::Tan(opl * .5 * kDegrad); | |
161 | thu = TMath::Tan(opu * .5 * kDegrad); | |
162 | // --------------------------------------------------- | |
163 | // S and L-sectors radii | |
164 | // --------------------------------------------------- | |
165 | rssl = 88.; | |
166 | rssu = 136.; | |
167 | rlsl = 142.; | |
168 | rlsu = 250.; | |
169 | // -------------------------------------------------- | |
170 | // Sectors widths | |
171 | // -------------------------------------------------- | |
172 | wssl = 46.5; | |
173 | wssu = 72.2; | |
174 | wlsl = 37.; | |
175 | wlsu = 65.4; | |
176 | // --------------------------------------------------- | |
177 | // Sector thickness 25% of X0 (Al) | |
178 | // --------------------------------------------------- | |
179 | sec_thick = 2.225; | |
180 | // --------------------------------------------------- | |
181 | // S-sectors (lower sectors) | |
182 | // --------------------------------------------------- | |
183 | dm[0] = wssl * .5; | |
184 | dm[1] = wssu * .5; | |
185 | dm[2] = sec_thick * .5; | |
186 | dm[3] = (rssu - rssl) * .5; | |
187 | ||
188 | x0l = rssl + dm[3]; | |
189 | ||
190 | gMC->Gsvolu("TRCS", "TRD1", idtmed[399], dm, 4); | |
191 | // ----------------------------------------------------- | |
192 | // S-sectors --> "gas sectors" - sensitive | |
193 | // ----------------------------------------------------- | |
194 | dm[2] = (250.-0.001)/2.; | |
195 | gMC->Gsvolu("TSGA", "TRD1", idtmed[403], dm, 4); | |
196 | // ------------------------------------------------------------- | |
197 | // Only for the debugging purpose and resolution calculation | |
198 | // Sensitive strips at the pad-row center | |
199 | // ------------------------------------------------------------- | |
200 | if (fSens >= 0) { | |
201 | gMC->Gsvolu("TSST", "TRD1", idtmed[403], dm, 0); | |
202 | dm[3] = .005; | |
203 | ||
204 | z0 = rssl + (rssu - rssl) * .5; | |
205 | ||
206 | for (iss = 0; iss < fTPCParam->GetNRowLow(); ++iss) { | |
207 | r1 = fTPCParam->GetPadRowRadiiLow(iss); | |
208 | r2 = r1 + dm[3] * 2.; | |
209 | dm[0] = r1 * thl - 2.63; | |
210 | dm[1] = r2 * thl - 2.63; | |
211 | ||
212 | zz = -z0 + r1 +dm[3]; | |
213 | ||
214 | gMC->Gsposp("TSST", iss+1, "TSGA", 0, 0, zz, 0, "ONLY", dm, 4); | |
215 | } | |
216 | gMC->Gsord("TSGA", 3); | |
217 | } | |
218 | // --------------------------------------------------- | |
219 | // L-sectors (upper sectors) | |
220 | // --------------------------------------------------- | |
221 | dm[0] = wlsl * .5; | |
222 | dm[1] = wlsu * .5; | |
223 | dm[2] = sec_thick * .5; | |
224 | dm[3] = (rlsu - rlsl) * .5; | |
225 | ||
226 | x0u = rlsl + dm[3]; | |
227 | ||
228 | gMC->Gsvolu("TRCL", "TRD1", idtmed[399], dm, 4); | |
229 | // ----------------------------------------------------- | |
230 | // L-sectors - "gas sectors" - sensitive! | |
231 | // ----------------------------------------------------- | |
232 | dm[2] = (250.-0.001)/2.; | |
233 | gMC->Gsvolu("TLGA", "TRD1", idtmed[403], dm, 4); | |
234 | // ------------------------------------------------------------- | |
235 | // Only for the debugging purpose and resolution calculation | |
236 | // Sensitive strips at the pad-row center | |
237 | // ------------------------------------------------------------- | |
238 | if (fSens >= 0) { | |
239 | gMC->Gsvolu("TLST", "TRD1", idtmed[403], dm, 0); | |
240 | ||
241 | dm[3] = .005; | |
242 | ||
243 | z0 = rlsl+ (rlsu - rlsl) * .5; | |
244 | ||
245 | for (ils = 0; ils <fTPCParam->GetNRowUp(); ++ils) { | |
246 | r1 = fTPCParam->GetPadRowRadiiUp(ils); | |
247 | r2 = r1 + dm[3] * 2.; | |
248 | dm[0] = r1 * thu - 2.63; | |
249 | dm[1] = r2 * thu - 2.63; | |
250 | ||
251 | zz = -z0 + r1 +dm[3]; | |
252 | ||
253 | gMC->Gsposp("TLST", ils+1, "TLGA", 0, 0, zz, 0, "ONLY", dm, 4); | |
254 | } | |
255 | gMC->Gsord("TLGA", 3); | |
256 | } | |
257 | // ****************************************************** | |
258 | // ------------------------------------------------ | |
259 | // positioning of lower sectors (1-12)*2 | |
260 | // rotation matrices 1-12 | |
261 | ||
262 | // the isec_al flag allows to select all (<0) or | |
263 | // only a few (up to 6) sectors | |
264 | // ------------------------------------------------ | |
265 | z = (250.+0.001)/2.; | |
266 | z1 = -z_side + sec_thick * .5; | |
267 | ||
268 | for (il = 1; il <= 12; ++il) { | |
269 | phi1 = (il - 1) * opl + 270.; | |
270 | if (phi1 > 360.) { | |
271 | phi1 += -360.; | |
272 | } | |
273 | theta1 = 90.; | |
274 | phi2 = 90.; | |
275 | theta2 = 180.; | |
276 | phi3 = (il - 1) * opl; | |
277 | theta3 = 90.; | |
278 | ||
279 | idr = il; | |
280 | AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3); | |
281 | ||
282 | alpha = (il - 1) * opl * kDegrad; | |
283 | x = x0l * TMath::Cos(alpha); | |
284 | y = x0l * TMath::Sin(alpha); | |
285 | ||
286 | if (fSecAL < 0) { | |
287 | // ----------------------------------------------------------- | |
288 | // position ALL lower sectors | |
289 | // ----------------------------------------------------------- | |
290 | gMC->Gspos("TSGA", il, "TGAS", x, y, z, idrotm[idr], "ONLY"); | |
291 | gMC->Gspos("TSGA",il+12 , "TGAS", x, y, -z, idrotm[idr], "ONLY"); | |
292 | } else { | |
293 | // ----------------------------------------------------------- | |
294 | // position selected lower sectors | |
295 | // ----------------------------------------------------------- | |
296 | for (isll = 1; isll <= 6; ++isll) { | |
297 | if (fSecLows[isll - 1] == il) { | |
298 | gMC->Gspos("TSGA", il, "TGAS", x, y, z, idrotm[idr], "ONLY"); | |
299 | } else if (fSecLows[isll - 1] == il + 12) { | |
300 | gMC->Gspos("TSGA",il+12 , "TGAS", x, y, -z, idrotm[idr],"ONLY"); | |
301 | } | |
302 | } | |
303 | } | |
304 | ||
305 | gMC->Gspos("TRCS", il, "TPSG", x, y, z1, idrotm[idr], "ONLY"); | |
306 | ||
307 | } | |
308 | // ---------------------------------------------------- | |
309 | // positioning of upper sectors (1-24)*2 | |
310 | // rotation matrices 13-36 | |
311 | // the isec_au flag allows to select all (<0) or | |
312 | // only a few (up to 12) sectors | |
313 | // ---------------------------------------------------- | |
314 | for (iu = 1; iu <= 24; ++iu) { | |
315 | phi1 = (iu - 1) * opu + 270.; | |
316 | if (phi1 > 360.) { | |
317 | phi1 += -360.; | |
318 | } | |
319 | theta1 = 90.; | |
320 | phi2 = 90.; | |
321 | theta2 = 180.; | |
322 | phi3 = (iu - 1) * opu; | |
323 | theta3 = 90.; | |
324 | ||
325 | idr = iu + 12; | |
326 | AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3); | |
327 | ||
328 | alpha = (iu - 1) * opu * kDegrad; | |
329 | x = x0u * TMath::Cos(alpha); | |
330 | y = x0u * TMath::Sin(alpha); | |
331 | ||
332 | if (fSecAU < 0) { | |
333 | // ------------------------------------------------------------- | |
334 | // position ALL upper sectors | |
335 | // ------------------------------------------------------------- | |
336 | gMC->Gspos("TLGA", iu, "TGAS", x, y, z, idrotm[idr], "ONLY"); | |
337 | gMC->Gspos("TLGA",iu+24 , "TGAS", x, y, -z, idrotm[idr], "ONLY"); | |
338 | } else { | |
339 | // ------------------------------------------------------------- | |
340 | // position selected upper sectors | |
341 | // ------------------------------------------------------------- | |
342 | for (isll = 1; isll <= 12; ++isll) { | |
343 | if (fSecUps[isll - 1] == iu + 24) { | |
344 | gMC->Gspos("TLGA", iu, "TGAS", x, y, z, idrotm[idr], "ONLY"); | |
345 | } else if (fSecUps[isll - 1] == iu + 48) { | |
346 | gMC->Gspos("TLGA",iu+24 , "TGAS", x, y, -z, idrotm[idr],"ONLY"); | |
347 | } | |
348 | } | |
349 | } | |
350 | ||
351 | gMC->Gspos("TRCL", iu, "TPSG", x, y, z1, idrotm[idr], "ONLY"); | |
352 | } | |
353 | // -------------------------------------------------------- | |
354 | // Spoke wheel structures | |
355 | // -------------------------------------------------------- | |
356 | gMC->Gsvolu("TSWS", "TUBE", idtmed[399], dm, 0); | |
357 | ||
358 | z0 = -z_side + 2.; | |
359 | ||
360 | dm[0] = 82.; | |
361 | dm[1] = 86.; | |
362 | dm[2] = 1.; | |
363 | ||
364 | gMC->Gsposp("TSWS", 1, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3); | |
365 | ||
366 | dm[0] = 253.; | |
367 | dm[1] = 257.; | |
368 | ||
369 | gMC->Gsposp("TSWS", 2, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3); | |
370 | ||
371 | dm[0] = 140.9; | |
372 | dm[1] = 141.9; | |
373 | ||
374 | gMC->Gsposp("TSWS", 3, "TPSG", 0, 0, z0, 0, "ONLY", dm, 3); | |
375 | ||
376 | // ------------------------------------------------------- | |
377 | // this volumes are to avoid overlaping | |
378 | // ------------------------------------------------------- | |
379 | z0 = 253.; | |
380 | ||
381 | dm[0] = 76.; | |
382 | dm[1] = 76.+0.09776; | |
383 | ||
384 | gMC->Gsposp("TSWS", 4, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3); | |
385 | gMC->Gsposp("TSWS", 5, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3); | |
386 | ||
387 | z0 += 21.; | |
388 | ||
389 | gMC->Gsposp("TSWS", 6, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3); | |
390 | gMC->Gsposp("TSWS", 7, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3); | |
391 | ||
392 | dm[0] = 257.; | |
393 | dm[1] = 257.+0.09776; | |
394 | dm[2] = 11.5; | |
395 | ||
396 | z0 = 263.5; | |
397 | ||
398 | gMC->Gsposp("TSWS", 8, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3); | |
399 | gMC->Gsposp("TSWS", 9, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3); | |
400 | // ========================================================== | |
401 | // wheels | |
402 | // ========================================================== | |
403 | // ---------------------------------------------------------- | |
404 | // Large wheel -> positioned in the TPC | |
405 | // ---------------------------------------------------------- | |
406 | dm[0] = 257.+0.09776; | |
407 | dm[1] = 278.; | |
408 | dm[2] = 11.5; | |
409 | gMC->Gsvolu("TPW1", "TUBE", idtmed[399], dm, 3); | |
410 | ||
411 | dm[0] = 259.; | |
412 | dm[1] = 278.; | |
413 | dm[2] = 9.5; | |
414 | ||
415 | gMC->Gsvolu("TPW2", "TUBE", idtmed[498], dm, 3); | |
416 | ||
417 | gMC->Gspos("TPW2", 1, "TPW1", 0, 0, 0, 0, "ONLY"); | |
418 | ||
419 | gMC->Gspos("TPW1", 1, "TPC ", 0, 0, z0, 0, "ONLY"); | |
420 | gMC->Gspos("TPW1", 2, "TPC ", 0, 0, -z0, 0, "ONLY"); | |
421 | // ----------------------------------------------------------- | |
422 | // Small wheel -> positioned in the TPSG | |
423 | // ----------------------------------------------------------- | |
424 | dm[0] = 76.+0.09776; | |
425 | dm[1] = 82.; | |
426 | dm[2] = 11.5; | |
427 | ||
428 | gMC->Gsvolu("TPW3", "TUBE", idtmed[399], dm, 3); | |
429 | ||
430 | dm[0] = 76.+0.09776; | |
431 | dm[1] = 80.; | |
432 | dm[2] = 9.5; | |
433 | ||
434 | gMC->Gsvolu("TPW4", "TUBE", idtmed[401], dm, 3); | |
435 | ||
436 | gMC->Gspos("TPW4", 1, "TPW3", 0, 0, 0, 0, "ONLY"); | |
437 | ||
438 | z0 = 1.; | |
439 | ||
440 | gMC->Gspos("TPW3", 1, "TPSG", 0, 0, z0, 0, "ONLY"); | |
441 | // --------------------------------------------------------- | |
442 | // spokes, inner and outer, also the inner ring | |
443 | // --------------------------------------------------------- | |
444 | dm[0] = 0.5*(135.9-82.1); | |
445 | dm[1] = 3.; | |
446 | dm[2] = 2.; | |
447 | ||
448 | x1 = dm[0] + 82.; | |
449 | ||
450 | gMC->Gsvolu("TSPI", "BOX ", idtmed[399], dm, 3); | |
451 | ||
452 | dm[1] = 2.; | |
453 | dm[2] = 1.; | |
454 | ||
455 | gMC->Gsvolu("TSP1", "BOX ", idtmed[498], dm, 3); | |
456 | ||
457 | gMC->Gspos("TSP1", 1, "TSPI", 0, 0, 0, 0, "ONLY"); | |
458 | ||
459 | dm[0] = 0.5*(256.9-142.1); | |
460 | dm[1] = 3.; | |
461 | dm[2] = 2.; | |
462 | ||
463 | x2 = dm[0] + 142.; | |
464 | ||
465 | gMC->Gsvolu("TSPO", "BOX ", idtmed[399], dm, 3); | |
466 | ||
467 | dm[1] = 2.; | |
468 | dm[2] = 1.; | |
469 | ||
470 | gMC->Gsvolu("TSP2", "BOX ", idtmed[498], dm, 3); | |
471 | ||
472 | gMC->Gspos("TSP2", 1, "TSPO", 0, 0, 0, 0, "ONLY"); | |
473 | // -------------------------------------------------------- | |
474 | dm[0] = 136.; | |
475 | dm[1] = 142.; | |
476 | dm[2] = 2.; | |
477 | ||
478 | gMC->Gsvolu("TSWH", "TUBE", idtmed[399], dm, 3); | |
479 | ||
480 | dm[0] = 137.; | |
481 | dm[1] = 141.; | |
482 | dm[2] = 1.; | |
483 | ||
484 | gMC->Gsvolu("TSW1", "TUBE", idtmed[498], dm, 3); | |
485 | ||
486 | gMC->Gspos("TSW1", 1, "TSWH", 0, 0, 0, 0, "ONLY"); | |
487 | ||
488 | z0 = z_side - .16168 - 2.; | |
489 | // -------------------------------------------------------- | |
490 | gMC->Gspos("TSWH", 1, "TPSG", 0, 0, z0, 0, "ONLY"); | |
491 | // ------------------------------------------------------- | |
492 | // posiioning of the inner spokes | |
493 | // ------------------------------------------------------- | |
494 | for (il = 1; il <= 6; ++il) { | |
495 | phi1 = opl * .5 + (il - 1) * 2. * opl; | |
496 | theta1 = 90.; | |
497 | phi2 = opl * .5 + 90. + (il - 1) * 2. * opl; | |
498 | if (phi2 > 360.) { | |
499 | phi2 += -360.; | |
500 | } | |
501 | theta2 = 90.; | |
502 | phi3 = 0.; | |
503 | theta3 = 0.; | |
504 | ||
505 | alpha = phi1 * kDegrad; | |
506 | x = x1 * TMath::Cos(alpha); | |
507 | y = x1 * TMath::Sin(alpha); | |
508 | ||
509 | idr = il + 36; | |
510 | ||
511 | AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3); | |
512 | gMC->Gspos("TSPI", il, "TPSG", x, y, z0, idrotm[idr], "ONLY"); | |
513 | ||
514 | } | |
515 | ||
516 | for (iu = 1; iu <= 12; ++iu) { | |
517 | phi1 = opu * .5 + (iu - 1) * 2. * opu; | |
518 | theta1 = 90.; | |
519 | phi2 = opu * .5 + 90. + (iu - 1) * 2. * opu; | |
520 | if (phi2 > 360.) { | |
521 | phi2 += -360.; | |
522 | } | |
523 | theta2 = 90.; | |
524 | phi3 = 0.; | |
525 | theta3 = 0.; | |
526 | ||
527 | alpha = phi1 * kDegrad; | |
528 | x = x2 * TMath::Cos(alpha); | |
529 | y = x2 * TMath::Sin(alpha); | |
530 | ||
531 | idr = iu + 42; | |
532 | ||
533 | AliMatrix(idrotm[idr], theta1, phi1, theta2, phi2, theta3, phi3); | |
534 | gMC->Gspos("TSPO", iu, "TPSG", x, y, z0, idrotm[idr], "ONLY"); | |
535 | } | |
536 | // -------------------------------------------------------- | |
537 | // endcap cover (C, 0.86% X0) | |
538 | // -------------------------------------------------------- | |
539 | dm[0] = 76.+0.09776; | |
540 | dm[1] = 257.; | |
541 | dm[2] = 0.16168*0.5; | |
542 | ||
543 | gMC->Gsvolu("TCOV", "TUBE", idtmed[407], dm, 3); | |
544 | ||
545 | z0 = z_side - dm[2]; | |
546 | ||
547 | gMC->Gspos("TCOV", 1, "TPSG", 0, 0, z0, 0, "ONLY"); | |
548 | // -------------------------------------------------------- | |
549 | // put the readout chambers into the TPC | |
550 | // -------------------------------------------------------- | |
551 | theta1 = 90.; | |
552 | phi1 = 0.; | |
553 | theta2 = 90.; | |
554 | phi2 = 270.; | |
555 | theta3 = 180.; | |
556 | phi3 = 0.; | |
557 | ||
558 | AliMatrix(idrotm[55], theta1, phi1, theta2, phi2, theta3, phi3); | |
559 | ||
560 | z0 = z_side + 250.; | |
561 | ||
562 | gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY"); | |
563 | gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[55], "ONLY"); | |
564 | // --------------------------------------------------------- | |
565 | // outer gas insulation (CO2) | |
566 | // --------------------------------------------------------- | |
567 | dm[0] = 257.+0.09776; | |
568 | dm[1] = 278.-0.25004; | |
569 | dm[2] = 275.-23.; | |
570 | ||
571 | gMC->Gsvolu("TPOI", "TUBE", idtmed[406], dm, 3); | |
572 | ||
573 | gMC->Gspos("TPHV", 1, "TGAS", 0, 0, 0, 0, "ONLY"); | |
574 | gMC->Gspos("TGAS", 1, "TPC ", 0, 0, 0, 0, "ONLY"); | |
575 | gMC->Gspos("TPOI", 1, "TPC ", 0, 0, 0, 0, "ONLY"); | |
576 | ||
577 | gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY"); | |
578 | // ====================================================== | |
579 | // all volumes below are positioned in ALIC | |
580 | // ====================================================== | |
581 | // ------------------------------------------------------ | |
582 | // the last parts of the smaller wheel (TSWS) | |
583 | // ------------------------------------------------------ | |
584 | dm[0] = 74.; | |
585 | dm[1] = 76.; | |
586 | dm[2] = 1.; | |
587 | ||
588 | z0 = 253.; | |
589 | ||
590 | gMC->Gsposp("TSWS", 10, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3); | |
591 | gMC->Gsposp("TSWS", 11, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3); | |
592 | ||
593 | dm[0] = 70.; | |
594 | ||
595 | z0 += 21.; | |
596 | ||
597 | gMC->Gsposp("TSWS", 12, "TPC ", 0, 0, z0, 0, "ONLY", dm, 3); | |
598 | gMC->Gsposp("TSWS", 13, "TPC ", 0, 0, -z0, 0, "ONLY", dm, 3); | |
599 | // ---------------------------------------------------- | |
600 | // Inner vessel (PCON) | |
601 | // This volume is to be positioned directly in ALIC | |
602 | // ---------------------------------------------------- | |
603 | dm[0] = 0.; | |
604 | dm[1] = 360.; | |
605 | dm[2] = 4.; | |
606 | ||
607 | dm[3] = -250.; | |
608 | dm[4] = 75.; | |
609 | dm[5] = 76.; | |
610 | ||
611 | dm[6] = -64.5; | |
612 | dm[7] = 50.; | |
613 | dm[8] = 76.; | |
614 | ||
615 | dm[9] = 64.5; | |
616 | dm[10] = 50.; | |
617 | dm[11] = 76.; | |
618 | ||
619 | dm[12] = 250.; | |
620 | dm[13] = 75.; | |
621 | dm[14] = 76.; | |
622 | ||
623 | gMC->Gsvolu("TPIV", "PCON", idtmed[407], dm, 15); | |
624 | // -------------------------------------------------------- | |
625 | // fill the inner vessel with CO2, (HV kDegrader) | |
626 | // cone parts have different thickness | |
627 | // than the central barrel, according to the TP | |
628 | // -------------------------------------------------------- | |
629 | tana = 75./185.5; | |
630 | ||
631 | dm[0] = 0.; | |
632 | dm[1] = 360.; | |
633 | dm[2] = 6.; | |
634 | ||
635 | dm[3] = -(250.-0.2162); | |
636 | dm[4] = (185.5-0.2126)*tana+0.2126; | |
637 | dm[5] = 76-0.001; | |
638 | ||
639 | dm[6] = -64.5; | |
640 | dm[7] = 50.+0.2162; | |
641 | dm[8] = 76-0.001; | |
642 | ||
643 | dm[9] = -64.5; | |
644 | dm[10] = 50+0.05076; | |
645 | dm[11] = 76-0.001; | |
646 | ||
647 | dm[12] = 64.5; | |
648 | dm[13] = 50+0.05076; | |
649 | dm[14] = 76-0.001; | |
650 | ||
651 | dm[15] = 64.5; | |
652 | dm[16] = 50.+0.2162; | |
653 | dm[17] = 76-0.001; | |
654 | ||
655 | dm[18] = (250.-0.2162); | |
656 | dm[19] = (185.5-0.2126)*tana+0.2126; | |
657 | dm[20] = 76-0.001; | |
658 | ||
659 | gMC->Gsvolu("TPVD", "PCON", idtmed[406], dm, 21); | |
660 | ||
661 | gMC->Gspos("TPVD", 1, "TPIV", 0, 0, 0, 0, "ONLY"); | |
662 | ||
663 | gMC->Gspos("TPIV", 1, "ALIC", 0, 0, 0, 0, "ONLY"); | |
664 | // --------------------------------------------------- | |
665 | // volumes ordering | |
666 | // --------------------------------------------------- | |
667 | gMC->Gsord("TGAS", 6); | |
668 | gMC->Gsord("TPSG", 6); | |
669 | } | |
670 | ||
671 | //_____________________________________________________________________________ | |
672 | void AliTPCv2::DrawDetector() | |
673 | { | |
674 | // | |
675 | // Draw a shaded view of the Time Projection Chamber version 1 | |
676 | // | |
677 | ||
678 | // Set everything unseen | |
679 | gMC->Gsatt("*", "seen", -1); | |
680 | // | |
681 | // Set ALIC mother transparent | |
682 | gMC->Gsatt("ALIC","SEEN",0); | |
683 | // | |
684 | // Set the volumes visible | |
685 | gMC->Gsatt("TPC","SEEN",0); | |
686 | gMC->Gsatt("TGAS","SEEN",0); | |
687 | gMC->Gsatt("TPSG","SEEN",0); | |
688 | gMC->Gsatt("TPHV","SEEN",1); | |
689 | gMC->Gsatt("TRCS","SEEN",1); | |
690 | gMC->Gsatt("TRCL","SEEN",1); | |
691 | gMC->Gsatt("TSWS","SEEN",1); | |
692 | gMC->Gsatt("TPW1","SEEN",1); | |
693 | gMC->Gsatt("TPW3","SEEN",1); | |
694 | gMC->Gsatt("TSPI","SEEN",1); | |
695 | gMC->Gsatt("TSPO","SEEN",1); | |
696 | gMC->Gsatt("TSWH","SEEN",1); | |
697 | gMC->Gsatt("TPOI","SEEN",1); | |
698 | gMC->Gsatt("TPIV","SEEN",1); | |
699 | gMC->Gsatt("TPVD","SEEN",1); | |
700 | // | |
701 | gMC->Gdopt("hide", "on"); | |
702 | gMC->Gdopt("shad", "on"); | |
703 | gMC->Gsatt("*", "fill", 7); | |
704 | gMC->SetClipBox("."); | |
705 | gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000); | |
706 | gMC->DefaultRange(); | |
707 | gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025); | |
708 | gMC->Gdhead(1111, "Time Projection Chamber"); | |
709 | gMC->Gdman(18, 4, "MAN"); | |
710 | gMC->Gdopt("hide","off"); | |
711 | } | |
712 | ||
713 | //_____________________________________________________________________________ | |
714 | void AliTPCv2::CreateMaterials() | |
715 | { | |
716 | // | |
717 | // Define materials for version 2 of the Time Projection Chamber | |
718 | // | |
719 | ||
720 | // | |
721 | // Increase maximum number of steps | |
722 | gMC->SetMaxNStep(30000); | |
723 | // | |
724 | AliTPC::CreateMaterials(); | |
725 | } | |
726 | ||
727 | //_____________________________________________________________________________ | |
728 | void AliTPCv2::Init() | |
729 | { | |
730 | // | |
731 | // Initialises version 2 of the TPC after that it has been built | |
732 | // | |
733 | Int_t *idtmed = fIdtmed->GetArray()-399; | |
734 | AliTPC::Init(); | |
735 | fIdSens1=gMC->VolId("TLGA"); // L-sector | |
736 | fIdSens2=gMC->VolId("TSGA"); // S-sector | |
737 | fIdSens3=gMC->VolId("TSST"); // strip - S-sector (not always used) | |
738 | fIdSens4=gMC->VolId("TLST"); // strip - S-sector (not always used) | |
739 | ||
740 | gMC->SetMaxNStep(30000); // max. number of steps increased | |
741 | ||
742 | gMC->Gstpar(idtmed[403],"LOSS",5); | |
743 | ||
744 | printf("*** TPC version 2 initialized ***\n"); | |
745 | printf("Maximum number of steps = %d\n",gMC->GetMaxNStep()); | |
746 | ||
747 | // | |
748 | ||
749 | } | |
750 | ||
751 | //_____________________________________________________________________________ | |
752 | void AliTPCv2::StepManager() | |
753 | { | |
754 | // | |
755 | // Called for every step in the Time Projection Chamber | |
756 | // | |
757 | ||
758 | // | |
759 | // parameters used for the energy loss calculations | |
760 | // | |
761 | const Float_t prim = 14.35; // number of primary collisions per 1 cm | |
762 | const Float_t poti = 20.77e-9; // first ionization potential for Ne/CO2 | |
763 | const Float_t w_ion = 35.97e-9; // energy for the ion-electron pair creation | |
764 | ||
765 | ||
766 | const Float_t big = 1.e10; | |
767 | ||
768 | Int_t id,copy; | |
769 | Float_t hits[4]; | |
770 | Int_t vol[2]; | |
771 | TClonesArray &lhits = *fHits; | |
772 | TLorentzVector pos; | |
773 | ||
774 | vol[1]=0; | |
775 | ||
776 | // | |
777 | ||
778 | gMC->SetMaxStep(big); | |
779 | ||
780 | if(!gMC->IsTrackAlive()) return; // particle has disappeared | |
781 | ||
782 | Float_t charge = gMC->TrackCharge(); | |
783 | ||
784 | if(TMath::Abs(charge)<=0.) return; // take only charged particles | |
785 | ||
786 | ||
787 | id=gMC->CurrentVolID(copy); | |
788 | ||
789 | // Check the sensitive volume | |
790 | ||
791 | if(id == fIdSens1) | |
792 | { | |
793 | vol[0] = copy + 24; // L-sector number | |
794 | } | |
795 | else if(id == fIdSens2) | |
796 | { | |
797 | vol[0] = copy; // S-sector number | |
798 | } | |
799 | else if(id == fIdSens3 && gMC->IsTrackEntering()) | |
800 | { | |
801 | vol[1] = copy; // row number | |
802 | id = gMC->CurrentVolOffID(1,copy); | |
803 | vol[0] = copy; // sector number (S-sector) | |
804 | ||
805 | gMC->TrackPosition(pos); | |
806 | hits[0]=pos[0]; | |
807 | hits[1]=pos[1]; | |
808 | hits[2]=pos[2]; | |
809 | hits[3]=0.; // this hit has no energy loss | |
810 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); | |
811 | } | |
812 | else if(id == fIdSens4 && gMC->IsTrackEntering()) | |
813 | { | |
814 | vol[1] = copy; // row number | |
815 | id = gMC->CurrentVolOffID(1,copy); | |
816 | vol[0] = copy+24; // sector number (L-sector) | |
817 | ||
818 | gMC->TrackPosition(pos); | |
819 | hits[0]=pos[0]; | |
820 | hits[1]=pos[1]; | |
821 | hits[2]=pos[2]; | |
822 | hits[3]=0.; // this hit has no energy loss | |
823 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); | |
824 | } | |
825 | else return; | |
826 | ||
827 | // | |
828 | // charged particle is in the sensitive volume | |
829 | // | |
830 | ||
831 | if(gMC->TrackStep() > 0) { | |
832 | ||
833 | Int_t nel = (Int_t)(((gMC->Edep())-poti)/w_ion) + 1; | |
834 | nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV | |
835 | ||
836 | gMC->TrackPosition(pos); | |
837 | hits[0]=pos[0]; | |
838 | hits[1]=pos[1]; | |
839 | hits[2]=pos[2]; | |
840 | hits[3]=(Float_t)nel; | |
841 | ||
842 | // Add this hit | |
843 | ||
844 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); | |
845 | ||
846 | } | |
847 | ||
848 | // Stemax calculation for the next step | |
849 | ||
850 | Float_t pp; | |
851 | TLorentzVector mom; | |
852 | gMC->TrackMomentum(mom); | |
853 | Float_t ptot=mom.Rho(); | |
854 | Float_t beta_gamma = ptot/gMC->TrackMass(); | |
855 | ||
856 | if(gMC->TrackPid() <= 3 && ptot > 0.002) | |
857 | { | |
858 | pp = prim*1.58; // electrons above 20 MeV/c are on the plateau! | |
859 | } | |
860 | else | |
861 | { | |
862 | pp=prim*BetheBloch(beta_gamma); | |
863 | if(TMath::Abs(charge) > 1.) pp *= (charge*charge); | |
864 | } | |
865 | ||
866 | Float_t random[1]; | |
867 | gMC->Rndm(random,1); // good, old GRNDM from Geant3 | |
868 | ||
869 | Double_t rnd = (Double_t)random[0]; | |
870 | ||
871 | gMC->SetMaxStep(-TMath::Log(rnd)/pp); | |
872 | ||
873 | } | |
874 | ||
875 | //_____________________________________________________________________________ | |
876 | Float_t AliTPCv2::BetheBloch(Float_t bg) | |
877 | { | |
878 | // | |
879 | // Bethe-Bloch energy loss formula | |
880 | // | |
881 | const Double_t p1=0.76176e-1; | |
882 | const Double_t p2=10.632; | |
883 | const Double_t p3=0.13279e-4; | |
884 | const Double_t p4=1.8631; | |
885 | const Double_t p5=1.9479; | |
886 | ||
887 | Double_t dbg = (Double_t) bg; | |
888 | ||
889 | Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg); | |
890 | ||
891 | Double_t aa = TMath::Power(beta,p4); | |
892 | Double_t bb = TMath::Power(1./dbg,p5); | |
893 | ||
894 | bb=TMath::Log(p3+bb); | |
895 | ||
896 | return ((Float_t)((p2-aa-bb)*p1/aa)); | |
897 | } |