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f7336fa3 | 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 | $Log$ | |
9d0b222b | 18 | Revision 1.2 2000/05/08 16:17:27 cblume |
19 | Merge TRD-develop | |
20 | ||
6f1e466d | 21 | Revision 1.1.4.1 2000/05/08 14:45:55 cblume |
22 | Bug fix in RotateBack(). Geometry update | |
23 | ||
24 | Revision 1.1 2000/02/28 19:00:44 cblume | |
25 | Add new TRD classes | |
26 | ||
f7336fa3 | 27 | */ |
28 | ||
29 | /////////////////////////////////////////////////////////////////////////////// | |
30 | // // | |
31 | // TRD geometry class // | |
32 | // // | |
33 | /////////////////////////////////////////////////////////////////////////////// | |
34 | ||
35 | #include "AliTRDgeometry.h" | |
36 | #include "AliTRDrecPoint.h" | |
37 | ||
38 | ClassImp(AliTRDgeometry) | |
39 | ||
40 | //_____________________________________________________________________________ | |
41 | AliTRDgeometry::AliTRDgeometry():AliGeometry() | |
42 | { | |
43 | // | |
44 | // AliTRDgeometry default constructor | |
45 | // | |
46 | ||
47 | Init(); | |
48 | ||
49 | } | |
50 | ||
51 | //_____________________________________________________________________________ | |
52 | AliTRDgeometry::~AliTRDgeometry() | |
53 | { | |
54 | ||
55 | } | |
56 | ||
57 | //_____________________________________________________________________________ | |
58 | void AliTRDgeometry::Init() | |
59 | { | |
60 | // | |
61 | // Initializes the geometry parameter | |
62 | // | |
63 | ||
64 | Int_t iplan; | |
65 | ||
66 | // The width of the chambers | |
67 | fCwidth[0] = 99.6; | |
68 | fCwidth[1] = 104.1; | |
69 | fCwidth[2] = 108.5; | |
70 | fCwidth[3] = 112.9; | |
71 | fCwidth[4] = 117.4; | |
72 | fCwidth[5] = 121.8; | |
73 | ||
74 | // The default pad dimensions | |
75 | fRowPadSize = 4.5; | |
76 | fColPadSize = 1.0; | |
77 | fTimeBinSize = 0.1; | |
78 | ||
79 | // The maximum number of pads | |
80 | // and the position of pad 0,0,0 | |
81 | // | |
82 | // chambers seen from the top: | |
83 | // +----------------------------+ | |
84 | // | | | |
85 | // | | ^ | |
86 | // | | rphi| | |
87 | // | | | | |
88 | // |0 | | | |
89 | // +----------------------------+ +------> | |
90 | // z | |
91 | // chambers seen from the side: ^ | |
92 | // +----------------------------+ time| | |
93 | // | | | | |
94 | // |0 | | | |
95 | // +----------------------------+ +------> | |
96 | // z | |
97 | // | |
98 | ||
99 | // The pad column (rphi-direction) | |
100 | for (iplan = 0; iplan < kNplan; iplan++) { | |
101 | fColMax[iplan] = 1 + TMath::Nint((fCwidth[iplan] - 2. * kCcthick) | |
102 | / fColPadSize - 0.5); | |
103 | fCol0[iplan] = -fCwidth[iplan]/2. + kCcthick; | |
104 | } | |
105 | ||
106 | // The time bucket | |
107 | fTimeMax = 1 + TMath::Nint(kDrThick / fTimeBinSize - 0.5); | |
108 | for (iplan = 0; iplan < kNplan; iplan++) { | |
109 | fTime0[iplan] = kRmin + kCcframe/2. + kDrZpos - 0.5 * kDrThick | |
110 | + iplan * (kCheight + kCspace); | |
111 | } | |
112 | ||
113 | } | |
114 | ||
115 | //_____________________________________________________________________________ | |
116 | void AliTRDgeometry::CreateGeometry(Int_t *idtmed) | |
117 | { | |
118 | // | |
119 | // Create the TRD geometry | |
120 | // | |
121 | // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99 | |
122 | // | |
123 | // The volumes: | |
124 | // TRD1-3 (Air) --- The TRD mother volumes for one sector. | |
125 | // To be placed into the spaceframe. | |
126 | // | |
127 | // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout) | |
128 | // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers | |
129 | // (driftchamber + radiator) | |
130 | // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers | |
131 | // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the | |
132 | // inner(/middle/outer) chambers | |
133 | // | |
134 | // The material layers in one chamber: | |
135 | // UL01 (G10) --- The gas seal of the radiator | |
136 | // UL02 (CO2) --- The gas in the radiator | |
137 | // UL03 (PE) --- The foil stack | |
138 | // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode | |
139 | // UL05 (Xe) --- The driftvolume | |
140 | // UL06 (Xe) --- The amplification region | |
141 | // | |
142 | // UL07 (Cu) --- The pad plane | |
143 | // UL08 (G10) --- The Nomex honeycomb support structure | |
144 | // UL09 (Cu) --- FEE and signal lines | |
145 | // UL10 (PE) --- The cooling devices | |
146 | // UL11 (Water) --- The cooling water | |
147 | ||
148 | const Int_t npar_cha = 3; | |
149 | ||
150 | Float_t par_dum[3]; | |
151 | Float_t par_cha[npar_cha]; | |
152 | ||
153 | Float_t xpos, ypos, zpos; | |
154 | ||
155 | // The aluminum frames - readout + electronics (Al) | |
156 | // The inner chambers | |
157 | gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],par_dum,0); | |
158 | // The middle chambers | |
159 | gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],par_dum,0); | |
160 | // The outer chambers | |
161 | gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],par_dum,0); | |
162 | ||
163 | // The inner part of the aluminum frames (Air) | |
164 | // The inner chambers | |
165 | gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],par_dum,0); | |
166 | // The middle chambers | |
167 | gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],par_dum,0); | |
168 | // The outer chambers | |
169 | gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],par_dum,0); | |
170 | ||
171 | // The carbon frames - radiator + driftchamber (C) | |
172 | // The inner chambers | |
173 | gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],par_dum,0); | |
174 | // The middle chambers | |
175 | gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],par_dum,0); | |
176 | // The outer chambers | |
177 | gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],par_dum,0); | |
178 | ||
179 | // The inner part of the carbon frames (Air) | |
180 | // The inner chambers | |
181 | gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],par_dum,0); | |
182 | // The middle chambers | |
183 | gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],par_dum,0); | |
184 | // The outer chambers | |
185 | gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],par_dum,0); | |
186 | ||
187 | // The material layers inside the chambers | |
188 | par_cha[0] = -1.; | |
189 | par_cha[1] = -1.; | |
190 | // G10 layer (radiator seal) | |
191 | par_cha[2] = kSeThick/2; | |
192 | gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],par_cha,npar_cha); | |
193 | // CO2 layer (radiator) | |
194 | par_cha[2] = kRaThick/2; | |
195 | gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],par_cha,npar_cha); | |
196 | // PE layer (radiator) | |
197 | par_cha[2] = kPeThick/2; | |
198 | gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],par_cha,npar_cha); | |
199 | // Mylar layer (entrance window + HV cathode) | |
200 | par_cha[2] = kMyThick/2; | |
201 | gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],par_cha,npar_cha); | |
202 | // Xe/Isobutane layer (drift volume, sensitive) | |
203 | par_cha[2] = kDrThick/2.; | |
204 | gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],par_cha,npar_cha); | |
205 | // Xe/Isobutane layer (amplification volume, not sensitive) | |
206 | par_cha[2] = kAmThick/2.; | |
207 | gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],par_cha,npar_cha); | |
208 | ||
209 | // Cu layer (pad plane) | |
210 | par_cha[2] = kCuThick/2; | |
211 | gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],par_cha,npar_cha); | |
212 | // G10 layer (support structure) | |
213 | par_cha[2] = kSuThick/2; | |
214 | gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],par_cha,npar_cha); | |
215 | // Cu layer (FEE + signal lines) | |
216 | par_cha[2] = kFeThick/2; | |
217 | gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],par_cha,npar_cha); | |
218 | // PE layer (cooling devices) | |
219 | par_cha[2] = kCoThick/2; | |
220 | gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],par_cha,npar_cha); | |
221 | // Water layer (cooling) | |
222 | par_cha[2] = kWaThick/2; | |
223 | gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],par_cha,npar_cha); | |
224 | ||
225 | // Position the layers in the chambers | |
226 | xpos = 0; | |
227 | ypos = 0; | |
228 | ||
229 | // G10 layer (radiator seal) | |
230 | zpos = kSeZpos; | |
231 | gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY"); | |
232 | gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY"); | |
233 | gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY"); | |
234 | // CO2 layer (radiator) | |
235 | zpos = kRaZpos; | |
236 | gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY"); | |
237 | gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY"); | |
238 | gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY"); | |
239 | // PE layer (radiator) | |
240 | zpos = 0; | |
241 | gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY"); | |
242 | // Mylar layer (entrance window + HV cathode) | |
243 | zpos = kMyZpos; | |
244 | gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY"); | |
245 | gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY"); | |
246 | gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY"); | |
247 | // Xe/Isobutane layer (drift volume) | |
248 | zpos = kDrZpos; | |
249 | gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY"); | |
250 | gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY"); | |
251 | gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY"); | |
252 | // Xe/Isobutane layer (amplification volume) | |
253 | zpos = kAmZpos; | |
254 | gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY"); | |
255 | gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY"); | |
256 | gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY"); | |
257 | ||
258 | // Cu layer (pad plane) | |
259 | zpos = kCuZpos; | |
260 | gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY"); | |
261 | gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY"); | |
262 | gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY"); | |
263 | // G10 layer (support structure) | |
264 | zpos = kSuZpos; | |
265 | gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY"); | |
266 | gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY"); | |
267 | gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY"); | |
268 | // Cu layer (FEE + signal lines) | |
269 | zpos = kFeZpos; | |
270 | gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY"); | |
271 | gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY"); | |
272 | gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY"); | |
273 | // PE layer (cooling devices) | |
274 | zpos = kCoZpos; | |
275 | gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY"); | |
276 | gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY"); | |
277 | gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY"); | |
278 | // Water layer (cooling) | |
279 | zpos = kWaZpos; | |
280 | gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY"); | |
281 | gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY"); | |
282 | gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY"); | |
283 | ||
284 | } | |
285 | ||
286 | //_____________________________________________________________________________ | |
287 | Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) | |
288 | { | |
289 | // | |
290 | // Converts local pad-coordinates (row,col,time) into | |
291 | // global ALICE reference frame coordinates (x,y,z) | |
292 | // | |
293 | ||
294 | Int_t icham = GetChamber(idet); // Chamber info (0-4) | |
295 | Int_t isect = GetSector(idet); // Sector info (0-17) | |
296 | Int_t iplan = GetPlane(idet); // Plane info (0-5) | |
297 | ||
6f1e466d | 298 | return Local2Global(iplan,icham,isect,local,global); |
f7336fa3 | 299 | |
300 | } | |
301 | ||
302 | //_____________________________________________________________________________ | |
303 | Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect | |
304 | , Float_t *local, Float_t *global) | |
305 | { | |
306 | // | |
307 | // Converts local pad-coordinates (row,col,time) into | |
308 | // global ALICE reference frame coordinates (x,y,z) | |
309 | // | |
310 | ||
311 | Int_t idet = GetDetector(iplan,icham,isect); // Detector number | |
312 | ||
313 | Float_t padRow = local[0]; // Pad Row position | |
314 | Float_t padCol = local[1]; // Pad Column position | |
315 | Float_t timeSlice = local[2]; // Time "position" | |
316 | ||
317 | Float_t row0 = GetRow0(iplan,icham,isect); | |
318 | Float_t col0 = GetCol0(iplan); | |
319 | Float_t time0 = GetTime0(iplan); | |
320 | ||
321 | Float_t rot[3]; | |
322 | ||
323 | // calculate (x,y,z) position in rotated chamber | |
f7336fa3 | 324 | rot[0] = time0 + timeSlice * fTimeBinSize; |
6f1e466d | 325 | rot[1] = col0 + padCol * fColPadSize; |
f7336fa3 | 326 | rot[2] = row0 + padRow * fRowPadSize; |
327 | ||
328 | // Rotate back to original position | |
329 | return RotateBack(idet,rot,global); | |
330 | ||
331 | } | |
332 | ||
333 | //_____________________________________________________________________________ | |
334 | Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) | |
335 | { | |
336 | // | |
337 | // Rotates all chambers in the position of sector 0 and transforms | |
338 | // the coordinates in the ALICE restframe <pos> into the | |
339 | // corresponding local frame <rot>. | |
340 | // | |
341 | ||
342 | Int_t sector = GetSector(d); | |
343 | ||
344 | Float_t phi = -2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5); | |
345 | ||
346 | rot[0] = pos[0] * TMath::Cos(phi) + pos[1] * TMath::Sin(phi); | |
347 | rot[1] = -pos[0] * TMath::Sin(phi) + pos[1] * TMath::Cos(phi); | |
348 | rot[2] = pos[2]; | |
349 | ||
350 | return kTRUE; | |
351 | ||
352 | } | |
353 | ||
354 | //_____________________________________________________________________________ | |
355 | Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) | |
356 | { | |
357 | // | |
358 | // Rotates a chambers from the position of sector 0 into its | |
359 | // original position and transforms the corresponding local frame | |
360 | // coordinates <rot> into the coordinates of the ALICE restframe <pos>. | |
361 | // | |
362 | ||
363 | Int_t sector = GetSector(d); | |
364 | ||
365 | Float_t phi = 2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5); | |
366 | ||
6f1e466d | 367 | pos[0] = rot[0] * TMath::Cos(phi) + rot[1] * TMath::Sin(phi); |
368 | pos[1] = -rot[0] * TMath::Sin(phi) + rot[1] * TMath::Cos(phi); | |
369 | pos[2] = rot[2]; | |
f7336fa3 | 370 | |
371 | return kTRUE; | |
372 | ||
373 | } | |
374 | ||
375 | //_____________________________________________________________________________ | |
376 | Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) | |
377 | { | |
378 | // | |
379 | // Convert plane / chamber / sector into detector number | |
380 | // | |
381 | ||
382 | return (p + c * kNplan + s * kNplan * kNcham); | |
383 | ||
384 | } | |
385 | ||
386 | //_____________________________________________________________________________ | |
387 | Int_t AliTRDgeometry::GetPlane(Int_t d) | |
388 | { | |
389 | // | |
390 | // Reconstruct the plane number from the detector number | |
391 | // | |
392 | ||
393 | return ((Int_t) (d % kNplan)); | |
394 | ||
395 | } | |
396 | ||
397 | //_____________________________________________________________________________ | |
398 | Int_t AliTRDgeometry::GetChamber(Int_t d) | |
399 | { | |
400 | // | |
401 | // Reconstruct the chamber number from the detector number | |
402 | // | |
403 | ||
404 | return ((Int_t) (d % (kNplan * kNcham)) / kNplan); | |
405 | ||
406 | } | |
407 | ||
408 | //_____________________________________________________________________________ | |
409 | Int_t AliTRDgeometry::GetSector(Int_t d) | |
410 | { | |
411 | // | |
412 | // Reconstruct the sector number from the detector number | |
413 | // | |
414 | ||
415 | return ((Int_t) (d / (kNplan * kNcham))); | |
416 | ||
417 | } | |
418 | ||
419 | //_____________________________________________________________________________ | |
420 | void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos, TMatrix &mat) | |
421 | { | |
422 | // | |
423 | // Returns the global coordinate and error matrix of a AliTRDrecPoint | |
424 | // | |
425 | ||
426 | GetGlobal(p,pos); | |
9d0b222b | 427 | mat.Zero(); |
f7336fa3 | 428 | |
429 | } | |
430 | ||
431 | //_____________________________________________________________________________ | |
432 | void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) | |
433 | { | |
434 | // | |
435 | // Returns the global coordinate and error matrix of a AliTRDrecPoint | |
436 | // | |
437 | ||
438 | Int_t detector = ((AliTRDrecPoint *) p)->GetDetector(); | |
439 | ||
440 | Float_t global[3]; | |
441 | Float_t local[3]; | |
6f1e466d | 442 | local[0] = ((AliTRDrecPoint *) p)->GetLocalRow(); |
443 | local[1] = ((AliTRDrecPoint *) p)->GetLocalCol(); | |
444 | local[2] = ((AliTRDrecPoint *) p)->GetLocalTime(); | |
f7336fa3 | 445 | |
446 | if (Local2Global(detector,local,global)) { | |
447 | pos.SetX(global[0]); | |
448 | pos.SetY(global[1]); | |
449 | pos.SetZ(global[2]); | |
450 | } | |
451 | else { | |
452 | pos.SetX(0.0); | |
453 | pos.SetY(0.0); | |
454 | pos.SetZ(0.0); | |
455 | } | |
456 | ||
457 | } |