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 | $Log$ |
73042f01 |
18 | Revision 1.21.2.4 2000/06/26 07:39:42 kowal2 |
19 | Changes to obey the coding rules |
20 | |
21 | Revision 1.21.2.3 2000/06/25 08:38:41 kowal2 |
22 | Splitted from AliTPCtracking |
23 | |
24 | Revision 1.21.2.2 2000/06/16 12:58:13 kowal2 |
25 | Changed parameter settings |
26 | |
27 | Revision 1.21.2.1 2000/06/09 07:15:07 kowal2 |
28 | |
29 | Defaults loaded automatically (hard-wired) |
30 | Optional parameters can be set via macro called in the constructor |
31 | |
32 | Revision 1.21 2000/05/15 10:00:30 kowal2 |
33 | Corrected bug in the TPC geometry, thanks to Ivana Hrivnacova |
34 | |
e94dd9ca |
35 | Revision 1.20 2000/04/17 09:37:33 kowal2 |
36 | removed obsolete AliTPCDigitsDisplay.C |
37 | |
cc80f89e |
38 | Revision 1.19.8.2 2000/04/10 08:31:52 kowal2 |
39 | |
40 | Different geometry for different sectors |
41 | Updated readout chambers |
42 | Some modifications to StepManager by J.Belikov |
43 | |
44 | Revision 1.19.8.1 2000/04/10 07:56:53 kowal2 |
45 | Not used anymore - removed |
46 | |
47 | Revision 1.19 1999/11/04 17:28:07 fca |
48 | Correct barrel part of HV Degrader |
49 | |
a5371c42 |
50 | Revision 1.18 1999/10/14 16:52:08 fca |
51 | Only use PDG codes and not GEANT ones |
52 | |
69e40cce |
53 | Revision 1.17 1999/10/08 06:27:23 fca |
54 | Corrected bug in the HV degrader geometry, thanks to G.Tabary |
55 | |
d183a600 |
56 | Revision 1.16 1999/10/04 13:39:54 fca |
57 | Correct array index problem |
58 | |
cdde5b1e |
59 | Revision 1.15 1999/09/29 09:24:34 fca |
60 | Introduction of the Copyright and cvs Log |
61 | |
4c039060 |
62 | */ |
63 | |
73042f01 |
64 | // |
fe4da5cc |
65 | /////////////////////////////////////////////////////////////////////////////// |
66 | // // |
67 | // Time Projection Chamber version 2 -- detailed TPC and slow simulation // |
68 | // // |
69 | //Begin_Html |
70 | /* |
1439f98e |
71 | <img src="picts/AliTPCv2Class.gif"> |
fe4da5cc |
72 | */ |
73 | //End_Html |
74 | // // |
75 | // // |
76 | /////////////////////////////////////////////////////////////////////////////// |
2a49965d |
77 | #include <stdlib.h> |
fe4da5cc |
78 | |
79 | #include <TMath.h> |
bcac8ae4 |
80 | |
fe4da5cc |
81 | #include "AliTPCv2.h" |
cc80f89e |
82 | #include "AliTPCDigitsArray.h" |
fe4da5cc |
83 | #include "AliRun.h" |
fe4da5cc |
84 | #include "AliConst.h" |
69e40cce |
85 | #include "AliPDG.h" |
73042f01 |
86 | #include "AliTPCParam.h" |
87 | #include "AliTPCParamSR.h" |
8c555625 |
88 | |
fe4da5cc |
89 | ClassImp(AliTPCv2) |
90 | |
91 | //_____________________________________________________________________________ |
92 | AliTPCv2::AliTPCv2(const char *name, const char *title) : |
93 | AliTPC(name, title) |
94 | { |
95 | // |
96 | // Standard constructor for Time Projection Chamber version 2 |
97 | // |
98 | fIdSens1=0; |
99 | fIdSens2=0; |
100 | SetBufferSize(128000); |
73042f01 |
101 | |
102 | SetGasMixt(2,20,10,-1,0.9,0.1,0.); // Ne-CO2 90-10 |
103 | |
104 | // Default sectors |
105 | |
106 | SetSecAL(4); |
107 | SetSecAU(4); |
108 | SetSecLows(1, 2, 3, 19, 20, 21); |
109 | SetSecUps(37, 38, 39, 37+18, 38+18, 39+18, -1, -1, -1, -1, -1, -1); |
110 | SetSens(1); // sensitive strips |
111 | |
112 | if (fTPCParam) |
113 | fTPCParam->Write(fTPCParam->GetTitle()); |
fe4da5cc |
114 | } |
115 | |
116 | //_____________________________________________________________________________ |
117 | void AliTPCv2::CreateGeometry() |
118 | { |
119 | // |
120 | // Create the geometry of Time Projection Chamber version 2 |
121 | // |
122 | //Begin_Html |
123 | /* |
1439f98e |
124 | <img src="picts/AliTPCv2.gif"> |
fe4da5cc |
125 | */ |
126 | //End_Html |
127 | //Begin_Html |
128 | /* |
1439f98e |
129 | <img src="picts/AliTPCv2Tree.gif"> |
fe4da5cc |
130 | */ |
131 | //End_Html |
132 | |
8c555625 |
133 | |
1283eee5 |
134 | Int_t *idtmed = fIdtmed->GetArray(); |
135 | |
136 | Float_t dm[21]; |
62a73ee5 |
137 | Int_t idrotm[120]; |
1283eee5 |
138 | |
139 | Int_t nRotMat = 0; |
140 | |
73042f01 |
141 | Int_t i,ifl1,ifl2=0; |
1283eee5 |
142 | |
143 | Int_t nInnerSector = fTPCParam->GetNInnerSector()/2; |
144 | Int_t nOuterSector = fTPCParam->GetNOuterSector()/2; |
fe4da5cc |
145 | |
146 | // --------------------------------------------------- |
147 | // sector specification check |
148 | // --------------------------------------------------- |
149 | if (fSecAL >= 0) { |
150 | ifl1 = 0; |
151 | |
152 | for (i = 0; i < 6; ++i) { |
1283eee5 |
153 | if (fSecLows[i] >= 0 && fSecLows[i] < 2*nInnerSector) { |
fe4da5cc |
154 | ifl1 = 1; |
155 | printf("*** SECTOR %d selected\n",fSecLows[i]); |
156 | } |
157 | } |
158 | |
159 | } else { |
160 | printf("*** ALL LOWER SECTORS SELECTED ***\n"); |
8c555625 |
161 | ifl1 = 1; |
fe4da5cc |
162 | } |
163 | |
164 | if (fSecAU >= 0) { |
165 | ifl2 = 0; |
166 | |
167 | for (i = 0; i < 12; ++i) { |
1283eee5 |
168 | if (fSecUps[i] > 2*nInnerSector-1 && |
169 | fSecUps[i] < 2*(nInnerSector+nOuterSector)) { |
fe4da5cc |
170 | ifl2 = 1; |
171 | printf("*** SECTOR %d selected\n",fSecUps[i]); |
172 | } |
173 | } |
174 | |
175 | } else { |
176 | printf("*** ALL UPPER SECTORS SELECTED ***\n"); |
8c555625 |
177 | ifl1 = 1; |
fe4da5cc |
178 | } |
179 | |
180 | if (ifl1 == 0 && ifl2 == 0) { |
181 | printf("*** ERROR: AT LEAST ONE SECTOR MUST BE SPECIFIED ***\n"); |
182 | printf("!!! PROGRAM STOPPED !!!\n"); |
183 | exit(1); |
184 | } |
185 | |
186 | if ((fSecAL < 0 || fSecAU < 0) && fSens >= 0) { |
187 | printf("** ERROR: STRIPS CANNOT BE SPECIFIED FOR ALL SECTORS **\n"); |
188 | printf("!!! PROGRAM STOPPED !!!\n"); |
189 | exit(1); |
190 | } |
1283eee5 |
191 | |
fe4da5cc |
192 | // ---------------------------------------------------- |
1283eee5 |
193 | // FIELD CAGE WITH ENDCAPS - G10 |
fe4da5cc |
194 | // THIS IS ALSO A TPC MOTHER VOLUME |
195 | // ---------------------------------------------------- |
1283eee5 |
196 | |
fe4da5cc |
197 | dm[0] = 76.; |
198 | dm[1] = 278.; |
199 | dm[2] = 275.; |
1283eee5 |
200 | |
201 | gMC->Gsvolu("TPC ", "TUBE", idtmed[8], dm, 3); |
202 | |
203 | //----------------------------------------------------- |
204 | // Endcap cover c-fibre 0.86% X0 |
205 | //----------------------------------------------------- |
206 | |
207 | dm[0] = 78.; |
208 | dm[1] = 258.; |
209 | dm[2] = 0.95; |
210 | |
211 | gMC->Gsvolu("TPEC","TUBE",idtmed[10],dm,3); |
212 | |
213 | //----------------------------------------------------- |
214 | // Drift gas , leave 2 cm at the outer radius |
215 | // and inner raddius |
216 | //----------------------------------------------------- |
217 | |
218 | dm[0] = 78.; |
219 | dm[1] = 258.; |
fe4da5cc |
220 | dm[2] = 250.; |
1283eee5 |
221 | |
222 | gMC->Gsvolu("TGAS", "TUBE", idtmed[3], dm, 3); |
223 | |
224 | //------------------------------------------------------ |
225 | // membrane holder - carbon fiber |
226 | //------------------------------------------------------ |
227 | |
228 | |
229 | gMC->Gsvolu("TPMH","TUBE",idtmed[6],dm,0); |
230 | |
231 | dm[0] = 252.; |
232 | dm[1] = 258.; |
233 | dm[2] = 0.2; |
234 | |
235 | gMC->Gsposp("TPMH",1,"TGAS",0.,0.,0.,0,"ONLY",dm,3); |
236 | |
237 | dm[0] = 78.; |
cdde5b1e |
238 | dm[1] = 82.; |
1283eee5 |
239 | dm[2] = 0.1; |
240 | |
241 | gMC->Gsposp("TPMH",2,"TGAS",0.,0.,0.,0,"ONLY",dm,3); |
242 | |
243 | //---------------------------------------------------------- |
244 | // HV membrane - 25 microns of mylar |
245 | //---------------------------------------------------------- |
246 | |
247 | dm[0] = 82.; |
248 | dm[1] = 252.; |
249 | dm[2] = 0.00125; |
250 | |
251 | gMC->Gsvolu("TPHV","TUBE",idtmed[5],dm,3); |
252 | |
253 | gMC->Gspos("TPHV",1,"TGAS",0.,0.,0.,0,"ONLY"); |
254 | |
255 | gMC->Gspos("TGAS",1,"TPC ",0.,0.,0.,0,"ONLY"); |
256 | |
257 | //---------------------------------------------------------- |
258 | // "side" gas volume, the same as the drift gas |
259 | // the readout chambers are placed there. |
260 | //---------------------------------------------------------- |
261 | |
262 | dm[0] = 78.; |
263 | dm[1] = 258.; |
264 | dm[2] = 0.5*(275. - 250.); |
265 | |
266 | gMC->Gsvolu("TPSG", "TUBE", idtmed[2], dm, 3); |
267 | |
73042f01 |
268 | Float_t zSide = dm[2]; // 1/2 of the side gas thickness |
1283eee5 |
269 | |
cc80f89e |
270 | //------------------------------------------------------------ |
1283eee5 |
271 | // Readout chambers , 25% of X0, I use Al as the material |
cc80f89e |
272 | //------------------------------------------------------------ |
1283eee5 |
273 | |
73042f01 |
274 | Float_t innerOpenAngle = fTPCParam->GetInnerAngle(); |
275 | Float_t outerOpenAngle = fTPCParam->GetOuterAngle(); |
1283eee5 |
276 | |
73042f01 |
277 | Float_t innerAngleShift = fTPCParam->GetInnerAngleShift(); |
278 | Float_t outerAngleShift = fTPCParam->GetOuterAngleShift(); |
1283eee5 |
279 | |
73042f01 |
280 | Float_t inSecLowEdge = fTPCParam->GetInnerRadiusLow(); |
281 | Float_t inSecUpEdge = fTPCParam->GetInnerRadiusUp(); |
1283eee5 |
282 | |
73042f01 |
283 | Float_t ouSecLowEdge = fTPCParam->GetOuterRadiusLow(); |
284 | Float_t ouSecUpEdge = fTPCParam->GetOuterRadiusUp(); |
1283eee5 |
285 | |
286 | |
73042f01 |
287 | Float_t secThick = 2.225; // Al |
1283eee5 |
288 | |
73042f01 |
289 | Float_t lowEdge = fTPCParam->GetInnerFrameSpace(); |
1283eee5 |
290 | |
291 | // S (Inner) sectors |
292 | |
73042f01 |
293 | dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-lowEdge; |
294 | dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-lowEdge; |
295 | dm[2] = 0.5*secThick; |
296 | dm[3] = 0.5*(inSecUpEdge-inSecLowEdge); |
1283eee5 |
297 | |
73042f01 |
298 | Float_t xCenterS = inSecLowEdge+dm[3]; |
1283eee5 |
299 | |
300 | gMC->Gsvolu("TRCS", "TRD1", idtmed[0], dm, 4); |
301 | |
302 | // L (Outer) sectors |
303 | |
73042f01 |
304 | Float_t upEdge = fTPCParam->GetOuterFrameSpace(); |
cc80f89e |
305 | |
73042f01 |
306 | dm[0] = ouSecLowEdge*TMath::Tan(0.5*outerOpenAngle)-upEdge; |
307 | dm[1] = ouSecUpEdge*TMath::Tan(0.5*outerOpenAngle)-upEdge; |
308 | dm[2] = 0.5*secThick; |
309 | dm[3] = 0.5*(ouSecUpEdge-ouSecLowEdge); |
1283eee5 |
310 | |
73042f01 |
311 | Float_t xCenterL = ouSecLowEdge+dm[3]; |
1283eee5 |
312 | |
313 | gMC->Gsvolu("TRCL", "TRD1", idtmed[0], dm, 4); |
314 | |
73042f01 |
315 | Float_t z1 = -zSide + secThick*0.5; |
1283eee5 |
316 | |
317 | //------------------------------------------------------------------ |
318 | // S sectors - "gas sectors" (TRD1) |
319 | //------------------------------------------------------------------ |
320 | |
73042f01 |
321 | dm[0] = inSecLowEdge*TMath::Tan(0.5*innerOpenAngle)-0.01; |
322 | dm[1] = inSecUpEdge*TMath::Tan(0.5*innerOpenAngle)-0.01; |
1283eee5 |
323 | dm[2] = 0.5*(250. - 0.001); |
73042f01 |
324 | dm[3] = 0.5*(inSecUpEdge-inSecLowEdge); |
1283eee5 |
325 | |
326 | gMC->Gsvolu("TSGA", "TRD1", idtmed[4], dm, 4); // sensitive |
327 | |
fe4da5cc |
328 | // ------------------------------------------------------------- |
329 | // Only for the debugging purpose and resolution calculation |
330 | // Sensitive strips at the pad-row center |
331 | // ------------------------------------------------------------- |
1283eee5 |
332 | |
333 | Int_t ns; |
334 | |
335 | if(fSens>=0){ |
336 | |
337 | Float_t r1,r2,zz; |
338 | |
73042f01 |
339 | Float_t stripThick = 0.01; // 100 microns |
cc80f89e |
340 | Float_t dead; |
1283eee5 |
341 | |
342 | gMC->Gsvolu("TSST", "TRD1", idtmed[4], dm, 0); |
343 | |
344 | dm[2] = 0.5*(250. - 0.002); |
73042f01 |
345 | dm[3] = 0.5 * stripThick; |
1283eee5 |
346 | |
cc80f89e |
347 | dead= fTPCParam->GetInnerWireMount(); |
348 | |
1283eee5 |
349 | |
350 | for (ns = 0; ns < fTPCParam->GetNRowLow(); ns++) { |
351 | |
352 | r1 = fTPCParam->GetPadRowRadiiLow(ns); |
73042f01 |
353 | r2 = r1 + stripThick; |
354 | dm[0] = r1 * TMath::Tan(0.5*innerOpenAngle) - dead; |
355 | dm[1] = r2 * TMath::Tan(0.5*innerOpenAngle) - dead; |
1283eee5 |
356 | |
73042f01 |
357 | zz = -inSecLowEdge -0.5*(inSecUpEdge-inSecLowEdge); |
1283eee5 |
358 | zz += r1; |
359 | zz += dm[3]; |
360 | |
361 | gMC->Gsposp("TSST", ns+1, "TSGA", 0., 0., zz, 0, "ONLY", dm, 4); |
362 | |
fe4da5cc |
363 | |
1283eee5 |
364 | } |
365 | |
366 | gMC->Gsord("TSGA", 3); |
367 | |
368 | } // if strips selected |
369 | |
370 | |
371 | //----------------------------------------------------------------- |
372 | // L sectors - "gas sectors" (PGON to avoid overlaps) |
373 | //----------------------------------------------------------------- |
374 | |
73042f01 |
375 | dm[0] = 360.*kDegrad - 0.5*outerOpenAngle; |
1283eee5 |
376 | dm[0] *= kRaddeg; |
377 | dm[0] = (Float_t)TMath::Nint(dm[0]); |
378 | |
73042f01 |
379 | dm[1] = outerOpenAngle*kRaddeg; |
1283eee5 |
380 | dm[1] = (Float_t)TMath::Nint(dm[1]); |
381 | |
382 | dm[2] = 1.; |
383 | dm[3] = 4.; |
384 | |
385 | dm[4] = 0.002; |
73042f01 |
386 | dm[5] = ouSecLowEdge; |
387 | dm[6] = 252.*TMath::Cos(0.5*outerOpenAngle)-0.002; |
1283eee5 |
388 | |
389 | dm[7] = dm[4]+0.2; |
390 | dm[8] = dm[5]; |
391 | dm[9] = dm[6]; |
392 | |
393 | dm[10] = dm[7]; |
73042f01 |
394 | dm[11] = ouSecLowEdge; |
395 | dm[12] = ouSecUpEdge; |
1283eee5 |
396 | |
397 | dm[13] = 250.; |
398 | dm[14] = dm[11]; |
399 | dm[15] = dm[12]; |
400 | |
401 | gMC->Gsvolu("TLGA","PGON",idtmed[4],dm,16); |
8c555625 |
402 | |
fe4da5cc |
403 | if (fSens >= 0) { |
fe4da5cc |
404 | |
1283eee5 |
405 | Float_t rmax = dm[6]; |
406 | Float_t r1,r2; |
cc80f89e |
407 | Float_t dead = fTPCParam->GetOuterWireMount(); |
8c555625 |
408 | |
73042f01 |
409 | Float_t stripThick = 0.01; // 100 microns |
8c555625 |
410 | |
1283eee5 |
411 | gMC->Gsvolu("TLST", "PGON", idtmed[4], dm, 0); |
412 | |
73042f01 |
413 | dm[0] = 360.*kDegrad - 0.5*outerOpenAngle; |
1283eee5 |
414 | dm[0] *= kRaddeg; |
415 | dm[0] = (Float_t)TMath::Nint(dm[0]); |
416 | |
73042f01 |
417 | dm[1] = outerOpenAngle*kRaddeg; |
1283eee5 |
418 | dm[1] = (Float_t)TMath::Nint(dm[1]); |
8c555625 |
419 | |
fe4da5cc |
420 | dm[2] = 1.; |
1283eee5 |
421 | dm[3] = 2.; |
fe4da5cc |
422 | |
1283eee5 |
423 | dm[7] = 250.; |
fe4da5cc |
424 | |
73042f01 |
425 | Float_t xx = dead/TMath::Tan(0.5*outerOpenAngle); |
fe4da5cc |
426 | |
1283eee5 |
427 | for(ns=0;ns<fTPCParam->GetNRowUp();ns++){ |
fe4da5cc |
428 | |
1283eee5 |
429 | r1 = fTPCParam->GetPadRowRadiiUp(ns)-xx; |
73042f01 |
430 | r2 = r1 + stripThick; |
1283eee5 |
431 | |
432 | dm[5] = r1; |
433 | dm[6] = r2; |
434 | |
435 | dm[8] = r1; |
436 | dm[9] = r2; |
437 | |
438 | if(r2+xx < rmax){ |
439 | dm[4] = 0.002; |
fe4da5cc |
440 | } |
1283eee5 |
441 | else{ |
442 | dm[4] = 0.202; |
443 | } |
444 | |
445 | gMC->Gsposp("TLST",ns+1,"TLGA",xx,0.,0.,0,"ONLY",dm,10); |
446 | |
447 | } |
448 | |
62a73ee5 |
449 | gMC->Gsord("TLGA", 4); |
1283eee5 |
450 | |
451 | } // if strips selected |
452 | |
453 | //------------------------------------------------------------------ |
454 | // Positioning of the S-sector readout chambers |
455 | //------------------------------------------------------------------ |
456 | |
457 | Float_t zs = 0.5*(250.+0.002); |
458 | |
459 | Float_t theta1,theta2,theta3; |
460 | Float_t phi1,phi2,phi3; |
461 | Float_t alpha; |
462 | Float_t x,y; |
463 | |
464 | for(ns=0;ns<nInnerSector;ns++){ |
465 | |
73042f01 |
466 | phi1 = ns * innerOpenAngle + 270.*kDegrad + innerAngleShift; |
1283eee5 |
467 | phi1 *= kRaddeg; // in degrees |
468 | |
469 | phi1 = (Float_t)TMath::Nint(phi1); |
470 | |
471 | if (phi1 > 360.) phi1 -= 360.; |
fe4da5cc |
472 | |
1283eee5 |
473 | theta1 = 90.; |
474 | phi2 = 90.; |
475 | theta2 = 180.; |
73042f01 |
476 | phi3 = ns * innerOpenAngle + innerAngleShift; |
1283eee5 |
477 | phi3 *= kRaddeg; // in degrees |
478 | |
479 | phi3 = (Float_t)TMath::Nint(phi3); |
fe4da5cc |
480 | |
1283eee5 |
481 | if(phi3 > 360.) phi3 -= 360.; |
482 | |
483 | theta3 = 90.; |
484 | |
485 | alpha = phi3*kDegrad; |
486 | |
487 | x = xCenterS * TMath::Cos(alpha); |
488 | y = xCenterS * TMath::Sin(alpha); |
489 | |
490 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
491 | |
492 | gMC->Gspos("TRCS", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY"); |
493 | |
494 | if(fSecAL < 0){ |
495 | |
496 | //--------------------------------------------------------------- |
497 | // position all sectors |
498 | //--------------------------------------------------------------- |
499 | |
500 | gMC->Gspos("TSGA",ns+1,"TGAS",x,y,zs,idrotm[nRotMat], "ONLY"); |
501 | gMC->Gspos("TSGA",ns+1+nInnerSector,"TGAS",x,y,-zs,idrotm[nRotMat], "ONLY"); |
fe4da5cc |
502 | } |
1283eee5 |
503 | |
504 | else{ |
505 | |
506 | //--------------------------------------------------------------- |
507 | // position selected sectors |
508 | //--------------------------------------------------------------- |
509 | |
510 | for(Int_t sel=0;sel<6;sel++){ |
511 | |
512 | if(fSecLows[sel] == ns){ |
513 | gMC->Gspos("TSGA", ns+1, "TGAS", x, y, zs, idrotm[nRotMat], "ONLY"); |
514 | } |
515 | else if(fSecLows[sel] == ns+nInnerSector){ |
516 | gMC-> |
517 | Gspos("TSGA",ns+1+nInnerSector,"TGAS", x, y,-zs,idrotm[nRotMat],"ONLY"); |
518 | } |
fe4da5cc |
519 | } |
fe4da5cc |
520 | } |
1283eee5 |
521 | |
522 | nRotMat++; |
523 | |
524 | } |
fe4da5cc |
525 | |
1283eee5 |
526 | //------------------------------------------------------------------- |
527 | // Positioning of the L-sectors readout chambers |
528 | //------------------------------------------------------------------- |
fe4da5cc |
529 | |
1283eee5 |
530 | for(ns=0;ns<nOuterSector;ns++){ |
73042f01 |
531 | phi1 = ns * outerOpenAngle + 270.*kDegrad + outerAngleShift; |
1283eee5 |
532 | phi1 *= kRaddeg; // in degrees |
533 | |
534 | phi1 = (Float_t)TMath::Nint(phi1); |
fe4da5cc |
535 | |
1283eee5 |
536 | |
537 | if (phi1 > 360.) phi1 -= 360.; |
538 | |
fe4da5cc |
539 | theta1 = 90.; |
1283eee5 |
540 | phi2 = 90.; |
541 | theta2 = 180.; |
73042f01 |
542 | phi3 = ns * outerOpenAngle+outerAngleShift; |
1283eee5 |
543 | phi3 *= kRaddeg; // in degrees |
fe4da5cc |
544 | |
1283eee5 |
545 | phi3 = (Float_t)TMath::Nint(phi3); |
fe4da5cc |
546 | |
1283eee5 |
547 | |
548 | if(phi3 > 360.) phi3 -= 360.; |
549 | |
550 | theta3 = 90.; |
551 | |
552 | alpha = phi3*kDegrad; |
553 | |
554 | x = xCenterL * TMath::Cos(alpha); |
555 | y = xCenterL * TMath::Sin(alpha); |
556 | |
557 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
558 | |
559 | |
560 | gMC->Gspos("TRCL", ns+1, "TPSG", x, y, z1, idrotm[nRotMat], "ONLY"); |
561 | |
562 | nRotMat++; |
563 | |
564 | } |
565 | |
566 | //------------------------------------------------------------------- |
567 | // Positioning of the L-sectors (gas sectors) |
568 | //------------------------------------------------------------------- |
569 | |
570 | for(ns=0;ns<nOuterSector;ns++){ |
571 | |
73042f01 |
572 | phi1 = ns*outerOpenAngle + outerAngleShift; |
1283eee5 |
573 | phi1 *= kRaddeg; |
fe4da5cc |
574 | |
1283eee5 |
575 | phi1 = (Float_t)TMath::Nint(phi1); |
576 | if(phi1>360.) phi1 -= 360.; |
577 | |
578 | theta1 = 90.; |
579 | |
580 | phi2 = 90. + phi1; |
581 | if(phi2>360.) phi2 -= 360.; |
582 | |
583 | theta2 = 90.; |
584 | |
585 | phi3 = 0.; |
586 | theta3 = 0.; |
587 | |
588 | if(fSecAU < 0) { |
589 | |
590 | //-------------------------------------------------------------- |
591 | // position all sectors |
592 | //-------------------------------------------------------------- |
593 | |
594 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
595 | |
596 | gMC->Gspos("TLGA",ns+1,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY"); |
597 | |
598 | nRotMat++; |
599 | |
600 | // reflection !! |
601 | |
602 | phi3 = 0.; |
603 | theta3 = 180.; |
604 | |
605 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
606 | |
607 | gMC->Gspos("TLGA",ns+1+nOuterSector,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY"); |
608 | |
609 | nRotMat++; |
610 | } |
611 | |
612 | else{ |
613 | |
614 | //--------------------------------------------------------------- |
615 | // position selected sectors |
616 | //--------------------------------------------------------------- |
617 | |
618 | for(Int_t sel=0;sel<12;sel++){ |
619 | |
620 | if(fSecUps[sel] == ns+2*nInnerSector){ |
621 | |
622 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
623 | gMC->Gspos("TLGA",ns+1,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY"); |
624 | nRotMat++; |
625 | |
626 | } |
627 | else if(fSecUps[sel] == ns+2*nInnerSector+nOuterSector){ |
628 | |
629 | // reflection |
630 | |
631 | phi3 = 0.; |
632 | theta3 = 180.; |
633 | |
634 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
635 | gMC-> |
636 | Gspos("TLGA",ns+1+nOuterSector,"TGAS" ,0.,0.,0.,idrotm[nRotMat],"ONLY"); |
637 | nRotMat++; |
638 | |
639 | } |
640 | |
641 | } |
642 | |
643 | } |
644 | |
645 | } |
646 | |
73042f01 |
647 | Float_t z0 = zSide - 0.95; |
1283eee5 |
648 | |
649 | gMC->Gspos("TPEC",1,"TPSG",0.,0.,z0,0,"ONLY"); |
650 | |
651 | // ========================================================== |
652 | // wheels |
653 | // ========================================================== |
654 | |
655 | // |
656 | // auxilary structures |
657 | // |
658 | |
659 | |
660 | gMC->Gsvolu("TPWI","TUBE",idtmed[24],dm,0); // "air" |
661 | |
662 | // ---------------------------------------------------------- |
663 | // Large wheel -> positioned in the TPC |
664 | // ---------------------------------------------------------- |
665 | |
666 | |
667 | z0 = 263.5; // TPC length - 1/2 spoke wheel width |
668 | |
669 | dm[0] = 258.; |
670 | dm[1] = 278.; |
671 | dm[2] = 11.5; |
672 | |
673 | gMC->Gsvolu("TPWL", "TUBE", idtmed[0], dm, 3); |
674 | |
675 | dm[0] = dm[0]+2.; |
676 | dm[1] = 278.; |
677 | dm[2] = dm[2]-2.; |
678 | |
679 | gMC->Gsposp("TPWI",1,"TPWL",0.,0.,0.,0,"ONLY",dm,3); |
680 | |
681 | gMC->Gspos("TPWL", 1, "TPC ", 0, 0, z0, 0, "ONLY"); |
682 | gMC->Gspos("TPWL", 2, "TPC ", 0, 0, -z0, 0, "ONLY"); |
683 | |
684 | // |
685 | // Outer vessel + CO2 HV degrader |
686 | // |
687 | |
688 | dm[0] = 260.; |
689 | dm[1] = 278.; |
690 | dm[2] = 252.; |
691 | |
692 | gMC->Gsvolu("TPCO","TUBE",idtmed[12],dm,3); |
693 | |
694 | dm[0] = 275.; |
695 | dm[1] = 278.; |
696 | |
697 | gMC->Gsvolu("TPOV","TUBE",idtmed[10],dm,3); |
698 | |
699 | gMC->Gspos("TPOV",1,"TPCO",0.,0.,0.,0,"ONLY"); |
700 | |
701 | |
1283eee5 |
702 | |
703 | gMC->Gspos("TPCO",1,"TPC ",0.,0.,0.,0,"ONLY"); |
704 | |
705 | |
706 | //---------------------------------------------------------- |
707 | // Small wheel -> positioned in "side gas |
708 | //---------------------------------------------------------- |
709 | |
710 | dm[0] = 78.; |
711 | dm[1] = 82.; |
712 | dm[2] = 11.5; |
713 | |
714 | gMC->Gsvolu("TPWS", "TUBE", idtmed[0], dm, 3); |
715 | |
716 | dm[0] = 78.; |
717 | dm[1] = dm[1]-2; |
718 | dm[2] = dm[2]-2.; |
719 | |
720 | gMC->Gsvolu("TPW1", "TUBE", idtmed[2], dm, 3); |
721 | |
722 | gMC->Gspos("TPW1", 1, "TPWS", 0., 0., 0., 0, "ONLY"); |
723 | |
724 | z0 = 1.; // spoke wheel is shifted w.r.t. center of the "side gas" |
725 | |
726 | gMC->Gspos("TPWS", 1, "TPSG", 0, 0, z0, 0, "ONLY"); |
727 | |
728 | |
729 | // to avoid overlaps |
730 | |
731 | dm[0] = 76.; |
732 | dm[1] = 78.; |
733 | dm[2] = 11.5; |
734 | |
735 | gMC->Gsvolu("TPS1","TUBE",idtmed[0],dm,3); |
736 | |
737 | dm[2] = 9.5; |
738 | |
739 | gMC->Gsvolu("TPS2","TUBE",idtmed[24],dm,3); |
740 | |
741 | gMC->Gspos("TPS2",1,"TPS1",0.,0.,0.,0,"ONLY"); |
742 | |
743 | z0= 263.5; |
744 | |
745 | gMC->Gspos("TPS1",1,"TPC ",0.,0.,z0,0,"ONLY"); |
746 | gMC->Gspos("TPS1",2,"TPC ",0.,0.,-z0,0,"ONLY"); |
747 | |
748 | // G10 plug |
749 | |
750 | dm[0] = 76.; |
7d7bb9e5 |
751 | dm[1] = 78.; |
752 | dm[2] = 1.; |
1283eee5 |
753 | |
754 | gMC->Gsvolu("TPG2","TUBE",idtmed[8],dm,3); |
755 | |
756 | z0 = 251.; |
757 | |
758 | gMC->Gspos("TPG2",1,"TPC ",0.,0.,z0,0,"ONLY"); |
759 | gMC->Gspos("TPG2",2,"TPC ",0.,0.,-z0,0,"ONLY"); |
760 | |
761 | |
762 | //--------------------------------------------------------- |
763 | // central wheel 6 (radial direction) x 4 (along z) cm2 |
764 | //--------------------------------------------------------- |
765 | |
766 | dm[0] = 140.; |
767 | dm[1] = 146.; |
768 | dm[2] = 2.; |
769 | |
770 | gMC->Gsvolu("TPWC","TUBE",idtmed[0],dm,3); |
771 | |
772 | dm[0] = dm[0] + 2.; |
773 | dm[1] = dm[1] - 2.; |
774 | dm[2] = dm[2] - 1.; |
775 | |
776 | gMC->Gsposp("TPWI",2,"TPWC",0.,0.,0.,0,"ONLY",dm,3); |
777 | |
73042f01 |
778 | z0 = zSide - 1.9 - 2.; |
1283eee5 |
779 | |
780 | gMC->Gspos("TPWC",1,"TPSG",0.,0.,z0,0,"ONLY"); |
781 | |
782 | // |
783 | |
784 | gMC->Gsvolu("TPSE","BOX ",idtmed[24],dm,0); // "empty" part of the spoke |
785 | |
786 | |
787 | //--------------------------------------------------------- |
788 | // inner spokes (nSectorInner) |
789 | //--------------------------------------------------------- |
790 | |
791 | dm[0] = 0.5*(139.9-82.1); |
792 | dm[1] = 3.; |
793 | dm[2] = 2.; |
794 | |
795 | Float_t x1 = dm[0]+82.; |
796 | |
797 | gMC->Gsvolu("TPSI","BOX",idtmed[0],dm,3); |
798 | |
799 | dm[1] = dm[1]-1.; |
800 | dm[2] = dm[2]-1.; |
801 | |
802 | gMC->Gsposp("TPSE",1,"TPSI",0.,0.,0.,0,"ONLY",dm,3); |
803 | |
804 | for(ns=0;ns<nInnerSector;ns++){ |
805 | |
73042f01 |
806 | phi1 = 0.5*innerOpenAngle + ns*innerOpenAngle + innerAngleShift; |
1283eee5 |
807 | theta1=90.; |
808 | phi1 *=kRaddeg; |
809 | |
810 | phi1 = (Float_t)TMath::Nint(phi1); |
811 | if(phi1>360.) phi1 -= 360.; |
812 | |
813 | phi2 = phi1+90.; |
814 | if(phi2>360.) phi2 -= 360.; |
815 | theta2=90.; |
816 | phi3=0.; |
817 | theta3=0.; |
818 | |
819 | alpha = phi1 * kDegrad; |
820 | x = x1 * TMath::Cos(alpha); |
821 | y = x1 * TMath::Sin(alpha); |
822 | |
823 | AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3); |
824 | |
825 | gMC->Gspos("TPSI",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY"); |
826 | |
827 | nRotMat++; |
828 | |
829 | } |
830 | |
831 | //------------------------------------------------------------- |
832 | // outer spokes (nSectorOuter) |
833 | //------------------------------------------------------------- |
834 | |
835 | dm[0] = 0.5*(257.9-146.1); |
836 | dm[1] = 3.; |
837 | dm[2] = 2.; |
838 | |
839 | x1 = dm[0] + 146.; |
840 | |
841 | gMC->Gsvolu("TPSO","BOX ",idtmed[0],dm,3); |
842 | |
843 | dm[1] = dm[1] - 1.; |
844 | dm[2] = dm[2] - 1.; |
845 | |
846 | gMC->Gsposp("TPSE",2,"TPSO",0.,0.,0.,0,"ONLY",dm,3); |
847 | |
848 | for(ns=0;ns<nOuterSector;ns++){ |
849 | |
73042f01 |
850 | phi1 = 0.5*outerOpenAngle + ns*outerOpenAngle + outerAngleShift; |
1283eee5 |
851 | theta1=90.; |
852 | phi1 *=kRaddeg; |
853 | |
854 | phi1 = (Float_t)TMath::Nint(phi1); |
855 | if(phi1>360.) phi1 -= 360.; |
856 | |
857 | phi2 = phi1+90.; |
858 | if(phi2>360.) phi2 -= 360.; |
859 | theta2=90.; |
860 | phi3=0.; |
861 | theta3=0.; |
862 | |
863 | alpha = phi1 * kDegrad; |
864 | x = x1 * TMath::Cos(alpha); |
865 | y = x1 * TMath::Sin(alpha); |
866 | |
867 | AliMatrix(idrotm[nRotMat],theta1,phi1,theta2,phi2,theta3,phi3); |
868 | |
869 | gMC->Gspos("TPSO",ns+1,"TPSG",x,y,z0,idrotm[nRotMat],"ONLY"); |
870 | |
871 | nRotMat++; |
872 | |
873 | } |
874 | |
875 | |
876 | |
877 | // -------------------------------------------------------- |
878 | // put the readout chambers into the TPC |
879 | // -------------------------------------------------------- |
880 | |
881 | theta1 = 90.; |
882 | phi1 = 0.; |
883 | theta2 = 90.; |
884 | phi2 = 270.; |
885 | theta3 = 180.; |
886 | phi3 = 0.; |
887 | |
888 | AliMatrix(idrotm[nRotMat], theta1, phi1, theta2, phi2, theta3, phi3); |
889 | |
73042f01 |
890 | z0 = zSide + 250.; |
1283eee5 |
891 | |
892 | gMC->Gspos("TPSG", 1, "TPC ", 0, 0, z0, 0, "ONLY"); |
893 | gMC->Gspos("TPSG", 2, "TPC ", 0, 0, -z0, idrotm[nRotMat], "ONLY"); |
894 | |
895 | gMC->Gspos("TPC ", 1, "ALIC", 0, 0, 0, 0, "ONLY"); |
896 | |
897 | //---------------------------------------------------- |
898 | // Inner vessel and HV degrader |
899 | //---------------------------------------------------- |
900 | |
901 | dm[0] = 0.; |
902 | dm[1] = 360.; |
903 | dm[2] = 4.; |
904 | |
905 | dm[3] = -250.; |
906 | dm[4] = 74.4; |
907 | dm[5] = 76.; |
908 | |
909 | dm[6] = -64.5; |
910 | dm[7] = 50.; |
911 | dm[8] = 76.; |
912 | |
d183a600 |
913 | dm[9] = 64.5; |
1283eee5 |
914 | dm[10] = 50.; |
915 | dm[11] = 76.; |
916 | |
917 | dm[12] = 250.; |
918 | dm[13] = 74.4; |
919 | dm[14] = 76.; |
920 | |
921 | gMC->Gsvolu("TPVD", "PCON", idtmed[12], dm, 15); // CO2 |
922 | |
923 | // cone parts |
924 | |
925 | dm[0] = 0.; |
926 | dm[1] = 360.; |
927 | dm[2] = 2.; |
928 | |
929 | dm[3] = 64.5; |
930 | dm[4] = 50.; |
931 | dm[5] = 51.6; |
932 | |
933 | dm[6] = 250.; |
934 | dm[7] = 74.4; |
935 | dm[8] = 76.; |
936 | |
937 | |
938 | gMC->Gsvolu("TIVC","PCON",idtmed[11],dm,9); // C-fibre |
939 | |
940 | gMC->Gspos("TIVC",1,"TPVD",0.,0.,0.,0,"ONLY"); |
941 | gMC->Gspos("TIVC",2,"TPVD",0.,0.,0.,idrotm[nRotMat],"ONLY"); |
942 | |
943 | // barrel part |
944 | |
945 | dm[0] = 50.; |
946 | dm[1] = 50.5; |
a5371c42 |
947 | dm[2] = 64.5; |
1283eee5 |
948 | |
949 | gMC->Gsvolu("TIVB","TUBE",idtmed[9],dm,3); |
950 | |
951 | gMC->Gspos("TIVB",1,"TPVD",0.,0.,0.,0,"ONLY"); |
952 | |
953 | gMC->Gspos("TPVD",1,"ALIC",0.,0.,0.,0,"ONLY"); |
954 | |
955 | |
956 | // --------------------------------------------------- |
957 | // volumes ordering |
958 | // --------------------------------------------------- |
959 | |
960 | gMC->Gsord("TGAS", 6); |
961 | gMC->Gsord("TPSG", 6); |
962 | |
963 | |
964 | |
965 | } // end of function |
fe4da5cc |
966 | |
967 | //_____________________________________________________________________________ |
8c555625 |
968 | void AliTPCv2::DrawDetector() |
fe4da5cc |
969 | { |
970 | // |
971 | // Draw a shaded view of the Time Projection Chamber version 1 |
972 | // |
973 | |
fe4da5cc |
974 | // Set everything unseen |
cfce8870 |
975 | gMC->Gsatt("*", "seen", -1); |
fe4da5cc |
976 | // |
977 | // Set ALIC mother transparent |
cfce8870 |
978 | gMC->Gsatt("ALIC","SEEN",0); |
fe4da5cc |
979 | // |
980 | // Set the volumes visible |
cfce8870 |
981 | gMC->Gsatt("TPC","SEEN",0); |
982 | gMC->Gsatt("TGAS","SEEN",0); |
983 | gMC->Gsatt("TPSG","SEEN",0); |
984 | gMC->Gsatt("TPHV","SEEN",1); |
1283eee5 |
985 | gMC->Gsatt("TPMH","SEEN",1); |
986 | gMC->Gsatt("TPEC","SEEN",0); |
cfce8870 |
987 | gMC->Gsatt("TRCS","SEEN",1); |
988 | gMC->Gsatt("TRCL","SEEN",1); |
1283eee5 |
989 | gMC->Gsatt("TPWL","SEEN",1); |
990 | gMC->Gsatt("TPWI","SEEN",1); |
991 | gMC->Gsatt("TPWS","SEEN",1); |
cfce8870 |
992 | gMC->Gsatt("TPW1","SEEN",1); |
1283eee5 |
993 | gMC->Gsatt("TPS1","SEEN",1); |
994 | gMC->Gsatt("TPS2","SEEN",1); |
995 | gMC->Gsatt("TPG1","SEEN",1); |
996 | gMC->Gsatt("TPG2","SEEN",1); |
997 | gMC->Gsatt("TPWC","SEEN",1); |
998 | gMC->Gsatt("TPSI","SEEN",1); |
999 | gMC->Gsatt("TPSO","SEEN",1); |
1000 | gMC->Gsatt("TPCO","SEEN",1); |
1001 | gMC->Gsatt("TPOV","SEEN",1); |
cfce8870 |
1002 | gMC->Gsatt("TPVD","SEEN",1); |
fe4da5cc |
1003 | // |
cfce8870 |
1004 | gMC->Gdopt("hide", "on"); |
1005 | gMC->Gdopt("shad", "on"); |
1006 | gMC->Gsatt("*", "fill", 7); |
1007 | gMC->SetClipBox("."); |
1008 | gMC->SetClipBox("*", 0, 1000, -1000, 1000, -1000, 1000); |
1009 | gMC->DefaultRange(); |
1010 | gMC->Gdraw("alic", 40, 30, 0, 12, 9.5, .025, .025); |
1011 | gMC->Gdhead(1111, "Time Projection Chamber"); |
1012 | gMC->Gdman(18, 4, "MAN"); |
1013 | gMC->Gdopt("hide","off"); |
fe4da5cc |
1014 | } |
1015 | |
1016 | //_____________________________________________________________________________ |
1017 | void AliTPCv2::CreateMaterials() |
1018 | { |
1019 | // |
1020 | // Define materials for version 2 of the Time Projection Chamber |
1021 | // |
1022 | |
fe4da5cc |
1023 | // |
1024 | // Increase maximum number of steps |
cfce8870 |
1025 | gMC->SetMaxNStep(30000); |
fe4da5cc |
1026 | // |
1027 | AliTPC::CreateMaterials(); |
1028 | } |
1029 | |
1030 | //_____________________________________________________________________________ |
1031 | void AliTPCv2::Init() |
1032 | { |
1033 | // |
1034 | // Initialises version 2 of the TPC after that it has been built |
1035 | // |
ad51aeb0 |
1036 | Int_t *idtmed = fIdtmed->GetArray()-399; |
fe4da5cc |
1037 | AliTPC::Init(); |
cfce8870 |
1038 | fIdSens1=gMC->VolId("TLGA"); // L-sector |
1039 | fIdSens2=gMC->VolId("TSGA"); // S-sector |
1040 | fIdSens3=gMC->VolId("TSST"); // strip - S-sector (not always used) |
1041 | fIdSens4=gMC->VolId("TLST"); // strip - S-sector (not always used) |
fe4da5cc |
1042 | |
cfce8870 |
1043 | gMC->SetMaxNStep(30000); // max. number of steps increased |
fe4da5cc |
1044 | |
cfce8870 |
1045 | gMC->Gstpar(idtmed[403],"LOSS",5); |
fe4da5cc |
1046 | |
1047 | printf("*** TPC version 2 initialized ***\n"); |
cfce8870 |
1048 | printf("Maximum number of steps = %d\n",gMC->GetMaxNStep()); |
fe4da5cc |
1049 | |
1050 | // |
1051 | |
1052 | } |
1053 | |
1054 | //_____________________________________________________________________________ |
1055 | void AliTPCv2::StepManager() |
1056 | { |
1057 | // |
1058 | // Called for every step in the Time Projection Chamber |
1059 | // |
1060 | |
1061 | // |
1062 | // parameters used for the energy loss calculations |
1063 | // |
73042f01 |
1064 | const Float_t kprim = 14.35; // number of primary collisions per 1 cm |
1065 | const Float_t kpoti = 20.77e-9; // first ionization potential for Ne/CO2 |
1066 | const Float_t kwIon = 35.97e-9; // energy for the ion-electron pair creation |
fe4da5cc |
1067 | |
1068 | |
73042f01 |
1069 | const Float_t kbig = 1.e10; |
fe4da5cc |
1070 | |
1071 | Int_t id,copy; |
1072 | Float_t hits[4]; |
1073 | Int_t vol[2]; |
1074 | TClonesArray &lhits = *fHits; |
0a6d8768 |
1075 | TLorentzVector pos; |
fe4da5cc |
1076 | |
1077 | vol[1]=0; |
1078 | |
1079 | // |
1080 | |
73042f01 |
1081 | gMC->SetMaxStep(kbig); |
fe4da5cc |
1082 | |
0a6d8768 |
1083 | if(!gMC->IsTrackAlive()) return; // particle has disappeared |
fe4da5cc |
1084 | |
cfce8870 |
1085 | Float_t charge = gMC->TrackCharge(); |
fe4da5cc |
1086 | |
1087 | if(TMath::Abs(charge)<=0.) return; // take only charged particles |
1088 | |
1089 | |
0a6d8768 |
1090 | id=gMC->CurrentVolID(copy); |
fe4da5cc |
1091 | |
1092 | // Check the sensitive volume |
1093 | |
1094 | if(id == fIdSens1) |
1095 | { |
1283eee5 |
1096 | vol[0] = copy + fTPCParam->GetNInnerSector()-1; // L-sector number |
fe4da5cc |
1097 | } |
1098 | else if(id == fIdSens2) |
1099 | { |
1283eee5 |
1100 | vol[0] = copy-1; // S-sector number |
fe4da5cc |
1101 | } |
0a6d8768 |
1102 | else if(id == fIdSens3 && gMC->IsTrackEntering()) |
fe4da5cc |
1103 | { |
1283eee5 |
1104 | vol[1] = copy-1; // row number |
0a6d8768 |
1105 | id = gMC->CurrentVolOffID(1,copy); |
1283eee5 |
1106 | vol[0] = copy-1; // sector number (S-sector) |
cc80f89e |
1107 | |
1108 | //I.Belikov's modification |
1109 | if (vol[1]==0) { |
1110 | gMC->TrackMomentum(pos); |
1111 | hits[0]=pos[0]; |
1112 | hits[1]=pos[1]; |
1113 | hits[2]=pos[2]; |
1114 | hits[3]=0.; // this hit has no energy loss |
1115 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
1116 | } |
1117 | //end of I.Belikov's modification |
fe4da5cc |
1118 | |
0a6d8768 |
1119 | gMC->TrackPosition(pos); |
1120 | hits[0]=pos[0]; |
1121 | hits[1]=pos[1]; |
1122 | hits[2]=pos[2]; |
fe4da5cc |
1123 | hits[3]=0.; // this hit has no energy loss |
1124 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
1125 | } |
0a6d8768 |
1126 | else if(id == fIdSens4 && gMC->IsTrackEntering()) |
fe4da5cc |
1127 | { |
1283eee5 |
1128 | vol[1] = copy-1; // row number |
0a6d8768 |
1129 | id = gMC->CurrentVolOffID(1,copy); |
1283eee5 |
1130 | vol[0] = copy+fTPCParam->GetNInnerSector()-1; // sector number (L-sector) |
cc80f89e |
1131 | |
1132 | //I.Belikov's modification |
1133 | if (vol[1]==0) { |
1134 | gMC->TrackMomentum(pos); |
1135 | hits[0]=pos[0]; |
1136 | hits[1]=pos[1]; |
1137 | hits[2]=pos[2]; |
1138 | hits[3]=0.; // this hit has no energy loss |
1139 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
1140 | } |
1141 | //end of I.Belikov's modification |
fe4da5cc |
1142 | |
0a6d8768 |
1143 | gMC->TrackPosition(pos); |
1144 | hits[0]=pos[0]; |
1145 | hits[1]=pos[1]; |
1146 | hits[2]=pos[2]; |
fe4da5cc |
1147 | hits[3]=0.; // this hit has no energy loss |
1148 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
1149 | } |
1150 | else return; |
1151 | |
1152 | // |
1153 | // charged particle is in the sensitive volume |
1154 | // |
1155 | |
cfce8870 |
1156 | if(gMC->TrackStep() > 0) { |
fe4da5cc |
1157 | |
73042f01 |
1158 | Int_t nel = (Int_t)(((gMC->Edep())-kpoti)/kwIon) + 1; |
fe4da5cc |
1159 | nel=TMath::Min(nel,300); // 300 electrons corresponds to 10 keV |
1160 | |
0a6d8768 |
1161 | gMC->TrackPosition(pos); |
1162 | hits[0]=pos[0]; |
1163 | hits[1]=pos[1]; |
1164 | hits[2]=pos[2]; |
fe4da5cc |
1165 | hits[3]=(Float_t)nel; |
1166 | |
1167 | // Add this hit |
1168 | |
1169 | new(lhits[fNhits++]) AliTPChit(fIshunt,gAlice->CurrentTrack(),vol,hits); |
1170 | |
1171 | } |
1172 | |
1173 | // Stemax calculation for the next step |
1174 | |
1175 | Float_t pp; |
0a6d8768 |
1176 | TLorentzVector mom; |
1177 | gMC->TrackMomentum(mom); |
1178 | Float_t ptot=mom.Rho(); |
73042f01 |
1179 | Float_t betaGamma = ptot/gMC->TrackMass(); |
fe4da5cc |
1180 | |
69e40cce |
1181 | Int_t pid=gMC->TrackPid(); |
cc80f89e |
1182 | if((pid==kElectron || pid==kPositron) && ptot > 0.002) |
fe4da5cc |
1183 | { |
73042f01 |
1184 | pp = kprim*1.58; // electrons above 20 MeV/c are on the plateau! |
fe4da5cc |
1185 | } |
1186 | else |
1187 | { |
73042f01 |
1188 | pp=kprim*BetheBloch(betaGamma); |
fe4da5cc |
1189 | if(TMath::Abs(charge) > 1.) pp *= (charge*charge); |
1190 | } |
1191 | |
1192 | Float_t random[1]; |
cfce8870 |
1193 | gMC->Rndm(random,1); // good, old GRNDM from Geant3 |
fe4da5cc |
1194 | |
1195 | Double_t rnd = (Double_t)random[0]; |
1196 | |
cfce8870 |
1197 | gMC->SetMaxStep(-TMath::Log(rnd)/pp); |
fe4da5cc |
1198 | |
1199 | } |
1200 | |
1201 | //_____________________________________________________________________________ |
1202 | Float_t AliTPCv2::BetheBloch(Float_t bg) |
1203 | { |
1204 | // |
1205 | // Bethe-Bloch energy loss formula |
1206 | // |
73042f01 |
1207 | const Double_t kp1=0.76176e-1; |
1208 | const Double_t kp2=10.632; |
1209 | const Double_t kp3=0.13279e-4; |
1210 | const Double_t kp4=1.8631; |
1211 | const Double_t kp5=1.9479; |
fe4da5cc |
1212 | |
1213 | Double_t dbg = (Double_t) bg; |
1214 | |
1215 | Double_t beta = dbg/TMath::Sqrt(1.+dbg*dbg); |
1216 | |
73042f01 |
1217 | Double_t aa = TMath::Power(beta,kp4); |
1218 | Double_t bb = TMath::Power(1./dbg,kp5); |
fe4da5cc |
1219 | |
73042f01 |
1220 | bb=TMath::Log(kp3+bb); |
fe4da5cc |
1221 | |
73042f01 |
1222 | return ((Float_t)((kp2-aa-bb)*kp1/aa)); |
fe4da5cc |
1223 | } |
73042f01 |
1224 | |
1225 | |