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 1.15 2002/02/11 14:21:16 cblume
19 Update of the geometry. Get rid of MANY
21 Revision 1.14 2001/11/06 17:19:41 cblume
22 Add detailed geometry and simple simulator
24 Revision 1.13 2001/08/02 08:30:45 cblume
25 Fix positions of cooling material
27 Revision 1.12 2001/05/21 16:45:47 hristov
28 Last minute changes (C.Blume)
30 Revision 1.11 2001/05/11 07:56:12 hristov
31 Consistent declarations needed on Alpha
33 Revision 1.10 2001/05/07 08:08:05 cblume
36 Revision 1.9 2001/03/27 12:48:33 cblume
37 Correct for volume overlaps
39 Revision 1.8 2001/03/13 09:30:35 cblume
40 Update of digitization. Moved digit branch definition to AliTRD
42 Revision 1.7 2001/02/14 18:22:26 cblume
43 Change in the geometry of the padplane
45 Revision 1.6 2000/11/01 14:53:20 cblume
46 Merge with TRD-develop
48 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
49 Changed timebin 0 to be the one closest to the readout
51 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
52 Include geometry constants as static member
54 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
57 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
58 Replace include files by forward declarations
60 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
61 Allow the pad/timebin-dimensions to be changed after initialization
63 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
64 Minor coding corrections
66 Revision 1.5 2000/10/02 21:28:19 fca
67 Removal of useless dependecies via forward declarations
69 Revision 1.4 2000/06/08 18:32:58 cblume
70 Make code compliant to coding conventions
72 Revision 1.3 2000/06/07 16:25:37 cblume
73 Try to remove compiler warnings on Sun and HP
75 Revision 1.2 2000/05/08 16:17:27 cblume
78 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
79 Bug fix in RotateBack(). Geometry update
81 Revision 1.4 2000/06/08 18:32:58 cblume
82 Make code compliant to coding conventions
84 Revision 1.3 2000/06/07 16:25:37 cblume
85 Try to remove compiler warnings on Sun and HP
87 Revision 1.2 2000/05/08 16:17:27 cblume
90 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
91 Bug fix in RotateBack(). Geometry update
93 Revision 1.1 2000/02/28 19:00:44 cblume
98 ///////////////////////////////////////////////////////////////////////////////
100 // TRD geometry class //
102 ///////////////////////////////////////////////////////////////////////////////
106 #include "AliTRDgeometry.h"
107 #include "AliTRDrecPoint.h"
110 ClassImp(AliTRDgeometry)
112 //_____________________________________________________________________________
115 // The geometry constants
117 const Int_t AliTRDgeometry::fgkNsect = kNsect;
118 const Int_t AliTRDgeometry::fgkNplan = kNplan;
119 const Int_t AliTRDgeometry::fgkNcham = kNcham;
120 const Int_t AliTRDgeometry::fgkNdet = kNdet;
123 // Dimensions of the detector
126 // Inner and outer radius of the mother volumes
127 const Float_t AliTRDgeometry::fgkRmin = 294.0;
128 const Float_t AliTRDgeometry::fgkRmax = 368.0;
130 // Upper and lower length of the mother volumes
131 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
132 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
134 // Parameter of the BTR mother volumes
135 const Float_t AliTRDgeometry::fgkSheight = 74.0;
136 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
137 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
138 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
139 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
140 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
142 // Height of different chamber parts
144 const Float_t AliTRDgeometry::fgkCraH = 4.8;
146 const Float_t AliTRDgeometry::fgkCdrH = 3.0;
147 // Amplification region
148 const Float_t AliTRDgeometry::fgkCamH = 0.7;
150 const Float_t AliTRDgeometry::fgkCroH = 2.0;
152 const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
153 + AliTRDgeometry::fgkCdrH
154 + AliTRDgeometry::fgkCamH
155 + AliTRDgeometry::fgkCroH;
157 // Vertical spacing of the chambers
158 const Float_t AliTRDgeometry::fgkVspace = 2.1;
160 // Horizontal spacing of the chambers
161 const Float_t AliTRDgeometry::fgkHspace = 2.0;
163 // Thicknesses of different parts of the chamber frame
164 // Lower aluminum frame
165 const Float_t AliTRDgeometry::fgkCalT = 0.3;
166 // Lower G10 frame sides
167 const Float_t AliTRDgeometry::fgkCclsT = 0.3;
168 // Lower G10 frame front
169 const Float_t AliTRDgeometry::fgkCclfT = 1.0;
171 const Float_t AliTRDgeometry::fgkCcuT = 0.9;
173 const Float_t AliTRDgeometry::fgkCauT = 1.5;
175 // Additional width of the readout chamber frames
176 const Float_t AliTRDgeometry::fgkCroW = 0.9;
178 // Difference of outer chamber width and pad plane width
179 const Float_t AliTRDgeometry::fgkCpadW = 1.0;
180 const Float_t AliTRDgeometry::fgkRpadW = 1.5;
183 // Thickness of the the material layers
185 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
186 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
187 const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
188 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
189 const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
190 + AliTRDgeometry::fgkAmThick;
191 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
192 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
193 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
194 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
195 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
198 // Position of the material layers
200 const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
201 const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
202 const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
203 const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
204 const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
205 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
206 const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
207 const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
208 const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
210 //_____________________________________________________________________________
211 AliTRDgeometry::AliTRDgeometry():AliGeometry()
214 // AliTRDgeometry default constructor
221 //_____________________________________________________________________________
222 AliTRDgeometry::~AliTRDgeometry()
225 // AliTRDgeometry destructor
230 //_____________________________________________________________________________
231 void AliTRDgeometry::Init()
234 // Initializes the geometry parameter
236 // The maximum number of pads
237 // and the position of pad 0,0,0
239 // chambers seen from the top:
240 // +----------------------------+
246 // +----------------------------+ +------>
248 // chambers seen from the side: ^
249 // +----------------------------+ drift|
252 // +----------------------------+ +------>
255 // IMPORTANT: time bin 0 is now the first one in the drift region
256 // closest to the readout !!!
263 // The outer width of the chambers
271 // The outer lengths of the chambers
272 Float_t length[kNplan][kNcham] = { { 123.5, 123.5, 110.0, 123.5, 123.5 }
273 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
274 , { 134.5, 138.5, 110.0, 138.5, 134.5 }
275 , { 142.0, 146.0, 110.0, 146.0, 142.0 }
276 , { 142.0, 153.0, 110.0, 153.0, 142.0 }
277 , { 134.0, 160.5, 110.0, 160.5, 134.0 } };
279 for (icham = 0; icham < kNcham; icham++) {
280 for (iplan = 0; iplan < kNplan; iplan++) {
281 fClength[iplan][icham] = length[iplan][icham];
282 fClengthPH[iplan][icham] = 0.0;
283 fClengthRH[iplan][icham] = 0.0;
287 // The pad size in column direction (rphi-direction)
288 SetColPadSize(0,0.65);
289 SetColPadSize(1,0.68);
290 SetColPadSize(2,0.71);
291 SetColPadSize(3,0.74);
292 SetColPadSize(4,0.77);
293 SetColPadSize(5,0.80);
295 // The pad row (z-direction)
298 // The number of time bins. Default is 100 ns timbin size
301 // Additional time bins before and after the drift region.
302 // Default is to only sample the drift region
303 SetExpandTimeBin(0,0);
305 // The rotation matrix elements
307 for (isect = 0; isect < fgkNsect; isect++) {
308 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
309 fRotA11[isect] = TMath::Cos(phi);
310 fRotA12[isect] = TMath::Sin(phi);
311 fRotA21[isect] = TMath::Sin(phi);
312 fRotA22[isect] = TMath::Cos(phi);
314 fRotB11[isect] = TMath::Cos(phi);
315 fRotB12[isect] = TMath::Sin(phi);
316 fRotB21[isect] = TMath::Sin(phi);
317 fRotB22[isect] = TMath::Cos(phi);
322 //_____________________________________________________________________________
323 void AliTRDgeometry::SetNRowPad(const Int_t p, const Int_t c, const Int_t npad)
326 // Redefines the number of pads in raw direction for
327 // a given plane and chamber number
330 for (Int_t isect = 0; isect < fgkNsect; isect++) {
332 fRowMax[p][c][isect] = npad;
334 fRowPadSize[p][c][isect] = (fClength[p][c] - 2.*fgkRpadW)
341 //_____________________________________________________________________________
342 void AliTRDgeometry::SetNRowPad()
345 // Defines the number of pads in row direction
352 Int_t rowMax[kNplan][kNcham] = { { 16, 16, 12, 16, 16 }
353 , { 16, 16, 12, 16, 16 }
354 , { 16, 16, 12, 16, 16 }
355 , { 16, 16, 12, 16, 16 }
356 , { 14, 16, 12, 16, 14 }
357 , { 13, 16, 12, 16, 13 } };
359 for (isect = 0; isect < kNsect; isect++) {
360 for (icham = 0; icham < kNcham; icham++) {
361 for (iplan = 0; iplan < kNplan; iplan++) {
363 fRowMax[iplan][icham][isect] = rowMax[iplan][icham];
365 fRowPadSize[iplan][icham][isect] = (fClength[iplan][icham] - 2.*fgkRpadW)
366 / ((Float_t) rowMax[iplan][icham]);
368 Float_t row0 = fgkRpadW - fClength[iplan][0]
370 - fClength[iplan][2]/2.;
371 for (Int_t ic = 0; ic < icham; ic++) {
372 row0 += fClength[iplan][ic];
374 fRow0[iplan][icham][isect] = row0;
382 //_____________________________________________________________________________
383 void AliTRDgeometry::SetColPadSize(const Int_t p, const Float_t s)
386 // Redefines the pad size in column direction
390 fCol0[p] = - fCwidth[p]/2. + fgkCpadW;
391 fColMax[p] = ((Int_t) ((fCwidth[p] - 2. * fgkCpadW) / s));
395 //_____________________________________________________________________________
396 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
399 // Redefines the number of time bins in the drift region.
400 // The time bin width is defined by the length of the
401 // drift region divided by <nbin>.
405 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
406 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
407 fTime0[iplan] = fgkRmin + fgkCraH + fgkCdrH
408 + iplan * (fgkCH + fgkVspace);
413 //_____________________________________________________________________________
414 void AliTRDgeometry::CreateGeometry(Int_t *idtmed) const
417 // Create TRD geometry
422 //_____________________________________________________________________________
423 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
426 // Converts local pad-coordinates (row,col,time) into
427 // global ALICE reference frame coordinates (x,y,z)
430 Int_t icham = GetChamber(idet); // Chamber info (0-4)
431 Int_t isect = GetSector(idet); // Sector info (0-17)
432 Int_t iplan = GetPlane(idet); // Plane info (0-5)
434 return Local2Global(iplan,icham,isect,local,global);
438 //_____________________________________________________________________________
439 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
440 , Float_t *local, Float_t *global) const
443 // Converts local pad-coordinates (row,col,time) into
444 // global ALICE reference frame coordinates (x,y,z)
447 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
449 Float_t padRow = local[0]+0.5; // Pad Row position
450 Float_t padCol = local[1]+0.5; // Pad Column position
451 Float_t timeSlice = local[2]+0.5; // Time "position"
453 Float_t row0 = GetRow0(iplan,icham,isect);
454 Float_t col0 = GetCol0(iplan);
455 Float_t time0 = GetTime0(iplan);
459 // calculate (x,y,z) position in rotated chamber
460 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
461 rot[1] = col0 + padCol * fColPadSize[iplan];
462 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
464 // Rotate back to original position
465 return RotateBack(idet,rot,global);
469 //_____________________________________________________________________________
470 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
473 // Rotates all chambers in the position of sector 0 and transforms
474 // the coordinates in the ALICE restframe <pos> into the
475 // corresponding local frame <rot>.
478 Int_t sector = GetSector(d);
480 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
481 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
488 //_____________________________________________________________________________
489 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
492 // Rotates a chambers from the position of sector 0 into its
493 // original position and transforms the corresponding local frame
494 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
497 Int_t sector = GetSector(d);
499 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
500 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
507 //_____________________________________________________________________________
508 Int_t AliTRDgeometry::GetDetectorSec(const Int_t p, const Int_t c) const
511 // Convert plane / chamber into detector number for one single sector
514 return (p + c * fgkNplan);
518 //_____________________________________________________________________________
519 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
522 // Convert plane / chamber / sector into detector number
525 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
529 //_____________________________________________________________________________
530 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
533 // Reconstruct the plane number from the detector number
536 return ((Int_t) (d % fgkNplan));
540 //_____________________________________________________________________________
541 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
544 // Reconstruct the chamber number from the detector number
547 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
551 //_____________________________________________________________________________
552 Int_t AliTRDgeometry::GetSector(const Int_t d) const
555 // Reconstruct the sector number from the detector number
558 return ((Int_t) (d / (fgkNplan * fgkNcham)));
562 //_____________________________________________________________________________
563 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
564 , TMatrix &mat) const
567 // Returns the global coordinate and error matrix of a AliTRDrecPoint
575 //_____________________________________________________________________________
576 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
579 // Returns the global coordinate and error matrix of a AliTRDrecPoint
582 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
586 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
587 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
588 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
590 if (Local2Global(detector,local,global)) {