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 1.14 2001/11/06 17:19:41 cblume
19 Add detailed geometry and simple simulator
21 Revision 1.13 2001/08/02 08:30:45 cblume
22 Fix positions of cooling material
24 Revision 1.12 2001/05/21 16:45:47 hristov
25 Last minute changes (C.Blume)
27 Revision 1.11 2001/05/11 07:56:12 hristov
28 Consistent declarations needed on Alpha
30 Revision 1.10 2001/05/07 08:08:05 cblume
33 Revision 1.9 2001/03/27 12:48:33 cblume
34 Correct for volume overlaps
36 Revision 1.8 2001/03/13 09:30:35 cblume
37 Update of digitization. Moved digit branch definition to AliTRD
39 Revision 1.7 2001/02/14 18:22:26 cblume
40 Change in the geometry of the padplane
42 Revision 1.6 2000/11/01 14:53:20 cblume
43 Merge with TRD-develop
45 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
46 Changed timebin 0 to be the one closest to the readout
48 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
49 Include geometry constants as static member
51 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
54 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
55 Replace include files by forward declarations
57 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
58 Allow the pad/timebin-dimensions to be changed after initialization
60 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
61 Minor coding corrections
63 Revision 1.5 2000/10/02 21:28:19 fca
64 Removal of useless dependecies via forward declarations
66 Revision 1.4 2000/06/08 18:32:58 cblume
67 Make code compliant to coding conventions
69 Revision 1.3 2000/06/07 16:25:37 cblume
70 Try to remove compiler warnings on Sun and HP
72 Revision 1.2 2000/05/08 16:17:27 cblume
75 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
76 Bug fix in RotateBack(). Geometry update
78 Revision 1.4 2000/06/08 18:32:58 cblume
79 Make code compliant to coding conventions
81 Revision 1.3 2000/06/07 16:25:37 cblume
82 Try to remove compiler warnings on Sun and HP
84 Revision 1.2 2000/05/08 16:17:27 cblume
87 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
88 Bug fix in RotateBack(). Geometry update
90 Revision 1.1 2000/02/28 19:00:44 cblume
95 ///////////////////////////////////////////////////////////////////////////////
97 // TRD geometry class //
99 ///////////////////////////////////////////////////////////////////////////////
103 #include "AliTRDgeometry.h"
104 #include "AliTRDrecPoint.h"
107 ClassImp(AliTRDgeometry)
109 //_____________________________________________________________________________
112 // The geometry constants
114 const Int_t AliTRDgeometry::fgkNsect = kNsect;
115 const Int_t AliTRDgeometry::fgkNplan = kNplan;
116 const Int_t AliTRDgeometry::fgkNcham = kNcham;
117 const Int_t AliTRDgeometry::fgkNdet = kNdet;
120 // Dimensions of the detector
123 // Inner and outer radius of the mother volumes
124 const Float_t AliTRDgeometry::fgkRmin = 294.0;
125 const Float_t AliTRDgeometry::fgkRmax = 368.0;
127 // Upper and lower length of the mother volumes
128 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
129 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
131 // Parameter of the BTR mother volumes
132 const Float_t AliTRDgeometry::fgkSheight = 74.0;
133 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
134 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
135 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
136 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
137 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
139 // Height of different chamber parts
141 const Float_t AliTRDgeometry::fgkCraH = 4.8;
143 const Float_t AliTRDgeometry::fgkCdrH = 3.0;
144 // Amplification region
145 const Float_t AliTRDgeometry::fgkCamH = 0.7;
147 const Float_t AliTRDgeometry::fgkCroH = 2.0;
149 const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
150 + AliTRDgeometry::fgkCdrH
151 + AliTRDgeometry::fgkCamH
152 + AliTRDgeometry::fgkCroH;
154 // Vertical spacing of the chambers
155 const Float_t AliTRDgeometry::fgkVspace = 2.1;
157 // Horizontal spacing of the chambers
158 const Float_t AliTRDgeometry::fgkHspace = 2.0;
160 // Thicknesses of different parts of the chamber frame
161 // Lower aluminum frame
162 const Float_t AliTRDgeometry::fgkCalT = 0.3;
163 // Lower G10 frame sides
164 const Float_t AliTRDgeometry::fgkCclsT = 0.3;
165 // Lower G10 frame front
166 const Float_t AliTRDgeometry::fgkCclfT = 1.0;
168 const Float_t AliTRDgeometry::fgkCcuT = 0.9;
170 const Float_t AliTRDgeometry::fgkCauT = 1.5;
172 // Additional width of the readout chamber frames
173 const Float_t AliTRDgeometry::fgkCroW = 0.9;
175 // Difference of outer chamber width and pad plane width
176 const Float_t AliTRDgeometry::fgkCpadW = 1.0;
177 const Float_t AliTRDgeometry::fgkRpadW = 1.5;
180 // Thickness of the the material layers
182 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
183 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
184 const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
185 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
186 const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
187 + AliTRDgeometry::fgkAmThick;
188 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
189 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
190 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
191 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
192 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
195 // Position of the material layers
197 const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
198 const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
199 const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
200 const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
201 const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
202 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
203 const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
204 const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
205 const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
207 //_____________________________________________________________________________
208 AliTRDgeometry::AliTRDgeometry():AliGeometry()
211 // AliTRDgeometry default constructor
218 //_____________________________________________________________________________
219 AliTRDgeometry::~AliTRDgeometry()
222 // AliTRDgeometry destructor
227 //_____________________________________________________________________________
228 void AliTRDgeometry::Init()
231 // Initializes the geometry parameter
233 // The maximum number of pads
234 // and the position of pad 0,0,0
236 // chambers seen from the top:
237 // +----------------------------+
243 // +----------------------------+ +------>
245 // chambers seen from the side: ^
246 // +----------------------------+ drift|
249 // +----------------------------+ +------>
252 // IMPORTANT: time bin 0 is now the first one in the drift region
253 // closest to the readout !!!
260 // The outer width of the chambers
268 // The outer lengths of the chambers
269 Float_t length[kNplan][kNcham] = { { 123.5, 123.5, 110.0, 123.5, 123.5 }
270 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
271 , { 134.5, 138.5, 110.0, 138.5, 134.5 }
272 , { 142.0, 146.0, 110.0, 146.0, 142.0 }
273 , { 142.0, 153.0, 110.0, 153.0, 142.0 }
274 , { 134.0, 160.5, 110.0, 160.5, 134.0 } };
276 for (icham = 0; icham < kNcham; icham++) {
277 for (iplan = 0; iplan < kNplan; iplan++) {
278 fClength[iplan][icham] = length[iplan][icham];
279 fClengthPH[iplan][icham] = 0.0;
280 fClengthRH[iplan][icham] = 0.0;
284 // The pad size in column direction (rphi-direction)
285 SetColPadSize(0,0.65);
286 SetColPadSize(1,0.68);
287 SetColPadSize(2,0.71);
288 SetColPadSize(3,0.74);
289 SetColPadSize(4,0.77);
290 SetColPadSize(5,0.80);
292 // The pad row (z-direction)
295 // The number of time bins. Default is 100 ns timbin size
298 // Additional time bins before and after the drift region.
299 // Default is to only sample the drift region
300 SetExpandTimeBin(0,0);
302 // The rotation matrix elements
304 for (isect = 0; isect < fgkNsect; isect++) {
305 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
306 fRotA11[isect] = TMath::Cos(phi);
307 fRotA12[isect] = TMath::Sin(phi);
308 fRotA21[isect] = TMath::Sin(phi);
309 fRotA22[isect] = TMath::Cos(phi);
311 fRotB11[isect] = TMath::Cos(phi);
312 fRotB12[isect] = TMath::Sin(phi);
313 fRotB21[isect] = TMath::Sin(phi);
314 fRotB22[isect] = TMath::Cos(phi);
319 //_____________________________________________________________________________
320 void AliTRDgeometry::SetNRowPad(const Int_t p, const Int_t c, const Int_t npad)
323 // Redefines the number of pads in raw direction for
324 // a given plane and chamber number
327 for (Int_t isect = 0; isect < fgkNsect; isect++) {
329 fRowMax[p][c][isect] = npad;
331 fRowPadSize[p][c][isect] = (fClength[p][c] - 2.*fgkRpadW)
338 //_____________________________________________________________________________
339 void AliTRDgeometry::SetNRowPad()
342 // Defines the number of pads in row direction
349 Int_t rowMax[kNplan][kNcham] = { { 16, 16, 12, 16, 16 }
350 , { 16, 16, 12, 16, 16 }
351 , { 16, 16, 12, 16, 16 }
352 , { 16, 16, 12, 16, 16 }
353 , { 14, 16, 12, 16, 14 }
354 , { 13, 16, 12, 16, 13 } };
356 for (isect = 0; isect < kNsect; isect++) {
357 for (icham = 0; icham < kNcham; icham++) {
358 for (iplan = 0; iplan < kNplan; iplan++) {
360 fRowMax[iplan][icham][isect] = rowMax[iplan][icham];
362 fRowPadSize[iplan][icham][isect] = (fClength[iplan][icham] - 2.*fgkRpadW)
363 / ((Float_t) rowMax[iplan][icham]);
365 Float_t row0 = fgkRpadW - fClength[iplan][0]
367 - fClength[iplan][2]/2.;
368 for (Int_t ic = 0; ic < icham; ic++) {
369 row0 += fClength[iplan][ic];
371 fRow0[iplan][icham][isect] = row0;
379 //_____________________________________________________________________________
380 void AliTRDgeometry::SetColPadSize(const Int_t p, const Float_t s)
383 // Redefines the pad size in column direction
387 fCol0[p] = - fCwidth[p]/2. + fgkCpadW;
388 fColMax[p] = ((Int_t) ((fCwidth[p] - 2. * fgkCpadW) / s));
392 //_____________________________________________________________________________
393 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
396 // Redefines the number of time bins in the drift region.
397 // The time bin width is defined by the length of the
398 // drift region divided by <nbin>.
402 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
403 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
404 fTime0[iplan] = fgkRmin + fgkCraH + fgkCdrH
405 + iplan * (fgkCH + fgkVspace);
410 //_____________________________________________________________________________
411 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
414 // Create TRD geometry
419 //_____________________________________________________________________________
420 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
423 // Converts local pad-coordinates (row,col,time) into
424 // global ALICE reference frame coordinates (x,y,z)
427 Int_t icham = GetChamber(idet); // Chamber info (0-4)
428 Int_t isect = GetSector(idet); // Sector info (0-17)
429 Int_t iplan = GetPlane(idet); // Plane info (0-5)
431 return Local2Global(iplan,icham,isect,local,global);
435 //_____________________________________________________________________________
436 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
437 , Float_t *local, Float_t *global) const
440 // Converts local pad-coordinates (row,col,time) into
441 // global ALICE reference frame coordinates (x,y,z)
444 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
446 Float_t padRow = local[0]+0.5; // Pad Row position
447 Float_t padCol = local[1]+0.5; // Pad Column position
448 Float_t timeSlice = local[2]+0.5; // Time "position"
450 Float_t row0 = GetRow0(iplan,icham,isect);
451 Float_t col0 = GetCol0(iplan);
452 Float_t time0 = GetTime0(iplan);
456 // calculate (x,y,z) position in rotated chamber
457 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
458 rot[1] = col0 + padCol * fColPadSize[iplan];
459 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
461 // Rotate back to original position
462 return RotateBack(idet,rot,global);
466 //_____________________________________________________________________________
467 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
470 // Rotates all chambers in the position of sector 0 and transforms
471 // the coordinates in the ALICE restframe <pos> into the
472 // corresponding local frame <rot>.
475 Int_t sector = GetSector(d);
477 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
478 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
485 //_____________________________________________________________________________
486 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
489 // Rotates a chambers from the position of sector 0 into its
490 // original position and transforms the corresponding local frame
491 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
494 Int_t sector = GetSector(d);
496 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
497 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
504 //_____________________________________________________________________________
505 Int_t AliTRDgeometry::GetDetectorSec(const Int_t p, const Int_t c) const
508 // Convert plane / chamber into detector number for one single sector
511 return (p + c * fgkNplan);
515 //_____________________________________________________________________________
516 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
519 // Convert plane / chamber / sector into detector number
522 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
526 //_____________________________________________________________________________
527 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
530 // Reconstruct the plane number from the detector number
533 return ((Int_t) (d % fgkNplan));
537 //_____________________________________________________________________________
538 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
541 // Reconstruct the chamber number from the detector number
544 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
548 //_____________________________________________________________________________
549 Int_t AliTRDgeometry::GetSector(const Int_t d) const
552 // Reconstruct the sector number from the detector number
555 return ((Int_t) (d / (fgkNplan * fgkNcham)));
559 //_____________________________________________________________________________
560 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
561 , TMatrix &mat) const
564 // Returns the global coordinate and error matrix of a AliTRDrecPoint
572 //_____________________________________________________________________________
573 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
576 // Returns the global coordinate and error matrix of a AliTRDrecPoint
579 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
583 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
584 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
585 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
587 if (Local2Global(detector,local,global)) {