1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.8 2001/03/13 09:30:35 cblume
19 Update of digitization. Moved digit branch definition to AliTRD
21 Revision 1.7 2001/02/14 18:22:26 cblume
22 Change in the geometry of the padplane
24 Revision 1.6 2000/11/01 14:53:20 cblume
25 Merge with TRD-develop
27 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
28 Changed timebin 0 to be the one closest to the readout
30 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
31 Include geometry constants as static member
33 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
36 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
37 Replace include files by forward declarations
39 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
40 Allow the pad/timebin-dimensions to be changed after initialization
42 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
43 Minor coding corrections
45 Revision 1.5 2000/10/02 21:28:19 fca
46 Removal of useless dependecies via forward declarations
48 Revision 1.4 2000/06/08 18:32:58 cblume
49 Make code compliant to coding conventions
51 Revision 1.3 2000/06/07 16:25:37 cblume
52 Try to remove compiler warnings on Sun and HP
54 Revision 1.2 2000/05/08 16:17:27 cblume
57 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
58 Bug fix in RotateBack(). Geometry update
60 Revision 1.4 2000/06/08 18:32:58 cblume
61 Make code compliant to coding conventions
63 Revision 1.3 2000/06/07 16:25:37 cblume
64 Try to remove compiler warnings on Sun and HP
66 Revision 1.2 2000/05/08 16:17:27 cblume
69 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
70 Bug fix in RotateBack(). Geometry update
72 Revision 1.1 2000/02/28 19:00:44 cblume
77 ///////////////////////////////////////////////////////////////////////////////
79 // TRD geometry class //
81 ///////////////////////////////////////////////////////////////////////////////
85 #include "AliTRDgeometry.h"
86 #include "AliTRDrecPoint.h"
89 ClassImp(AliTRDgeometry)
91 //_____________________________________________________________________________
94 // The geometry constants
96 const Int_t AliTRDgeometry::fgkNsect = kNsect;
97 const Int_t AliTRDgeometry::fgkNplan = kNplan;
98 const Int_t AliTRDgeometry::fgkNcham = kNcham;
99 const Int_t AliTRDgeometry::fgkNdet = kNdet;
102 // Dimensions of the detector
104 const Float_t AliTRDgeometry::fgkRmin = 294.0;
105 const Float_t AliTRDgeometry::fgkRmax = 368.0;
107 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
108 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
110 const Float_t AliTRDgeometry::fgkSheight = 74.0;
111 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
112 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
113 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
114 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
115 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
117 const Float_t AliTRDgeometry::fgkCheight = 11.0;
118 const Float_t AliTRDgeometry::fgkCspace = 1.6;
119 const Float_t AliTRDgeometry::fgkCathick = 1.0;
120 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
121 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
122 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
123 - AliTRDgeometry::fgkCaframe;
126 // Thickness of the the material layers
128 const Float_t AliTRDgeometry::fgkSeThick = 0.02;
129 const Float_t AliTRDgeometry::fgkRaThick = 4.78;
130 const Float_t AliTRDgeometry::fgkPeThick = 0.20;
131 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
132 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
133 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
134 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
135 - AliTRDgeometry::fgkDrThick;
136 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
137 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
138 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
139 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
140 const Float_t AliTRDgeometry::fgkWaThick = 0.01;
143 // Position of the material layers
145 const Float_t AliTRDgeometry::fgkSeZpos = -4.14;
146 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
147 const Float_t AliTRDgeometry::fgkPeZpos = 0.0000;
148 const Float_t AliTRDgeometry::fgkMyZpos = 0.6550;
149 const Float_t AliTRDgeometry::fgkDrZpos = 2.1600;
150 const Float_t AliTRDgeometry::fgkAmZpos = 3.9100;
151 const Float_t AliTRDgeometry::fgkCuZpos = -1.3370;
152 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
153 const Float_t AliTRDgeometry::fgkFeZpos = 1.3053;
154 const Float_t AliTRDgeometry::fgkCoZpos = 1.3175;
155 const Float_t AliTRDgeometry::fgkWaZpos = 1.3325;
157 //_____________________________________________________________________________
158 AliTRDgeometry::AliTRDgeometry():AliGeometry()
161 // AliTRDgeometry default constructor
168 //_____________________________________________________________________________
169 AliTRDgeometry::~AliTRDgeometry()
172 // AliTRDgeometry destructor
177 //_____________________________________________________________________________
178 void AliTRDgeometry::Init()
181 // Initializes the geometry parameter
186 // The width of the chambers
194 // The maximum number of pads
195 // and the position of pad 0,0,0
197 // chambers seen from the top:
198 // +----------------------------+
204 // +----------------------------+ +------>
206 // chambers seen from the side: ^
207 // +----------------------------+ drift|
210 // +----------------------------+ +------>
213 // IMPORTANT: time bin 0 is now the one closest to the readout !!!
216 // The pad column (rphi-direction)
219 // The time bucket. Default is 100 ns timbin size
222 // The rotation matrix elements
224 for (isect = 0; isect < fgkNsect; isect++) {
225 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
226 fRotA11[isect] = TMath::Cos(phi);
227 fRotA12[isect] = TMath::Sin(phi);
228 fRotA21[isect] = TMath::Sin(phi);
229 fRotA22[isect] = TMath::Cos(phi);
231 fRotB11[isect] = TMath::Cos(phi);
232 fRotB12[isect] = TMath::Sin(phi);
233 fRotB21[isect] = TMath::Sin(phi);
234 fRotB22[isect] = TMath::Cos(phi);
239 //_____________________________________________________________________________
240 void AliTRDgeometry::SetNColPad(Int_t npad)
243 // Redefines the number of pads in column direction
246 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
247 fColMax[iplan] = npad;
248 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
249 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
254 //_____________________________________________________________________________
255 void AliTRDgeometry::SetNTimeBin(Int_t nbin)
258 // Redefines the number of time bins
262 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
263 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
264 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
265 + iplan * (fgkCheight + fgkCspace);
270 //_____________________________________________________________________________
271 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
274 // Create the TRD geometry
276 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
279 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
280 // To be placed into the spaceframe.
282 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
283 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
284 // (driftchamber + radiator)
285 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
286 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
287 // inner(/middle/outer) chambers
289 // The material layers in one chamber:
290 // UL01 (G10) --- The gas seal of the radiator
291 // UL02 (CO2) --- The gas in the radiator
292 // UL03 (PE) --- The foil stack
293 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
294 // UL05 (Xe) --- The driftvolume
295 // UL06 (Xe) --- The amplification region
297 // UL07 (Cu) --- The pad plane
298 // UL08 (G10) --- The Nomex honeycomb support structure
299 // UL09 (Cu) --- FEE and signal lines
300 // UL10 (PE) --- The cooling devices
301 // UL11 (Water) --- The cooling water
303 const Int_t kNparCha = 3;
306 Float_t parCha[kNparCha];
308 Float_t xpos, ypos, zpos;
310 // The aluminum frames - readout + electronics (Al)
311 // The inner chambers
312 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
313 // The middle chambers
314 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
315 // The outer chambers
316 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
318 // The inner part of the aluminum frames (Air)
319 // The inner chambers
320 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
321 // The middle chambers
322 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
323 // The outer chambers
324 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
326 // The carbon frames - radiator + driftchamber (C)
327 // The inner chambers
328 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
329 // The middle chambers
330 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
331 // The outer chambers
332 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
334 // The inner part of the carbon frames (Air)
335 // The inner chambers
336 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
337 // The middle chambers
338 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
339 // The outer chambers
340 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
342 // The material layers inside the chambers
345 // G10 layer (radiator seal)
346 parCha[2] = fgkSeThick/2;
347 gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],parCha,kNparCha);
348 // CO2 layer (radiator)
349 parCha[2] = fgkRaThick/2;
350 gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],parCha,kNparCha);
351 // PE layer (radiator)
352 parCha[2] = fgkPeThick/2;
353 gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],parCha,kNparCha);
354 // Mylar layer (entrance window + HV cathode)
355 parCha[2] = fgkMyThick/2;
356 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
357 // Xe/Isobutane layer (drift volume, sensitive)
358 parCha[2] = fgkDrThick/2.;
359 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
360 // Xe/Isobutane layer (amplification volume, not sensitive)
361 parCha[2] = fgkAmThick/2.;
362 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
364 // Cu layer (pad plane)
365 parCha[2] = fgkCuThick/2;
366 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
367 // G10 layer (support structure)
368 parCha[2] = fgkSuThick/2;
369 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
370 // Cu layer (FEE + signal lines)
371 parCha[2] = fgkFeThick/2;
372 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
373 // PE layer (cooling devices)
374 parCha[2] = fgkCoThick/2;
375 gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],parCha,kNparCha);
376 // Water layer (cooling)
377 parCha[2] = fgkWaThick/2;
378 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
380 // Position the layers in the chambers
384 // G10 layer (radiator seal)
386 gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY");
387 gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
388 gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
389 // CO2 layer (radiator)
391 gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY");
392 gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
393 gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
394 // PE layer (radiator)
396 gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY");
397 // Mylar layer (entrance window + HV cathode)
399 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
400 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
401 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
402 // Xe/Isobutane layer (drift volume)
404 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
405 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
406 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
407 // Xe/Isobutane layer (amplification volume)
409 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
410 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
411 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
413 // Cu layer (pad plane)
415 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
416 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
417 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
418 // G10 layer (support structure)
420 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
421 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
422 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
423 // Cu layer (FEE + signal lines)
425 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
426 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
427 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
428 // PE layer (cooling devices)
430 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
431 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
432 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
433 // Water layer (cooling)
435 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
436 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
437 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
441 //_____________________________________________________________________________
442 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
445 // Converts local pad-coordinates (row,col,time) into
446 // global ALICE reference frame coordinates (x,y,z)
449 Int_t icham = GetChamber(idet); // Chamber info (0-4)
450 Int_t isect = GetSector(idet); // Sector info (0-17)
451 Int_t iplan = GetPlane(idet); // Plane info (0-5)
453 return Local2Global(iplan,icham,isect,local,global);
457 //_____________________________________________________________________________
458 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
459 , Float_t *local, Float_t *global) const
462 // Converts local pad-coordinates (row,col,time) into
463 // global ALICE reference frame coordinates (x,y,z)
466 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
468 Float_t padRow = local[0]; // Pad Row position
469 Float_t padCol = local[1]; // Pad Column position
470 Float_t timeSlice = local[2]; // Time "position"
472 Float_t row0 = GetRow0(iplan,icham,isect);
473 Float_t col0 = GetCol0(iplan);
474 Float_t time0 = GetTime0(iplan);
478 // calculate (x,y,z) position in rotated chamber
479 rot[0] = time0 - timeSlice * fTimeBinSize;
480 rot[1] = col0 + padCol * fColPadSize[iplan];
481 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
483 // Rotate back to original position
484 return RotateBack(idet,rot,global);
488 //_____________________________________________________________________________
489 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
492 // Rotates all chambers in the position of sector 0 and transforms
493 // the coordinates in the ALICE restframe <pos> into the
494 // corresponding local frame <rot>.
497 Int_t sector = GetSector(d);
499 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
500 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
507 //_____________________________________________________________________________
508 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
511 // Rotates a chambers from the position of sector 0 into its
512 // original position and transforms the corresponding local frame
513 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
516 Int_t sector = GetSector(d);
518 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
519 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
526 //_____________________________________________________________________________
527 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
530 // Convert plane / chamber / sector into detector number
533 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
537 //_____________________________________________________________________________
538 Int_t AliTRDgeometry::GetPlane(Int_t d) const
541 // Reconstruct the plane number from the detector number
544 return ((Int_t) (d % fgkNplan));
548 //_____________________________________________________________________________
549 Int_t AliTRDgeometry::GetChamber(Int_t d) const
552 // Reconstruct the chamber number from the detector number
555 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
559 //_____________________________________________________________________________
560 Int_t AliTRDgeometry::GetSector(Int_t d) const
563 // Reconstruct the sector number from the detector number
566 return ((Int_t) (d / (fgkNplan * fgkNcham)));
570 //_____________________________________________________________________________
571 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
572 , TMatrix &mat) const
575 // Returns the global coordinate and error matrix of a AliTRDrecPoint
583 //_____________________________________________________________________________
584 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
587 // Returns the global coordinate and error matrix of a AliTRDrecPoint
590 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
594 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
595 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
596 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
598 if (Local2Global(detector,local,global)) {