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 1.12 2001/05/21 16:45:47 hristov
19 Last minute changes (C.Blume)
21 Revision 1.11 2001/05/11 07:56:12 hristov
22 Consistent declarations needed on Alpha
24 Revision 1.10 2001/05/07 08:08:05 cblume
27 Revision 1.9 2001/03/27 12:48:33 cblume
28 Correct for volume overlaps
30 Revision 1.8 2001/03/13 09:30:35 cblume
31 Update of digitization. Moved digit branch definition to AliTRD
33 Revision 1.7 2001/02/14 18:22:26 cblume
34 Change in the geometry of the padplane
36 Revision 1.6 2000/11/01 14:53:20 cblume
37 Merge with TRD-develop
39 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
40 Changed timebin 0 to be the one closest to the readout
42 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
43 Include geometry constants as static member
45 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
48 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
49 Replace include files by forward declarations
51 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
52 Allow the pad/timebin-dimensions to be changed after initialization
54 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
55 Minor coding corrections
57 Revision 1.5 2000/10/02 21:28:19 fca
58 Removal of useless dependecies via forward declarations
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 1.4 2000/06/08 18:32:58 cblume
73 Make code compliant to coding conventions
75 Revision 1.3 2000/06/07 16:25:37 cblume
76 Try to remove compiler warnings on Sun and HP
78 Revision 1.2 2000/05/08 16:17:27 cblume
81 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
82 Bug fix in RotateBack(). Geometry update
84 Revision 1.1 2000/02/28 19:00:44 cblume
89 ///////////////////////////////////////////////////////////////////////////////
91 // TRD geometry class //
93 ///////////////////////////////////////////////////////////////////////////////
97 #include "AliTRDgeometry.h"
98 #include "AliTRDrecPoint.h"
101 ClassImp(AliTRDgeometry)
103 //_____________________________________________________________________________
106 // The geometry constants
108 const Int_t AliTRDgeometry::fgkNsect = kNsect;
109 const Int_t AliTRDgeometry::fgkNplan = kNplan;
110 const Int_t AliTRDgeometry::fgkNcham = kNcham;
111 const Int_t AliTRDgeometry::fgkNdet = kNdet;
114 // Dimensions of the detector
116 const Float_t AliTRDgeometry::fgkRmin = 294.0;
117 const Float_t AliTRDgeometry::fgkRmax = 368.0;
119 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
120 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
122 const Float_t AliTRDgeometry::fgkSheight = 74.0;
123 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
124 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
125 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
126 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
127 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
129 const Float_t AliTRDgeometry::fgkCheight = 11.0;
130 const Float_t AliTRDgeometry::fgkCspace = 1.6;
131 const Float_t AliTRDgeometry::fgkCathick = 1.0;
132 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
133 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
134 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
135 - AliTRDgeometry::fgkCaframe;
138 // Thickness of the the material layers
140 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
141 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
142 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
143 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
144 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
145 - AliTRDgeometry::fgkDrThick;
146 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
147 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
148 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
149 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
150 //const Float_t AliTRDgeometry::fgkWaThick = 0.01;
151 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
154 // Position of the material layers
156 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
157 const Float_t AliTRDgeometry::fgkMyZpos = 0.6550;
158 const Float_t AliTRDgeometry::fgkDrZpos = 2.1600;
159 const Float_t AliTRDgeometry::fgkAmZpos = 3.9100;
160 const Float_t AliTRDgeometry::fgkCuZpos = -1.3370;
161 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
162 //const Float_t AliTRDgeometry::fgkFeZpos = 1.3053;
163 //const Float_t AliTRDgeometry::fgkCoZpos = 1.3175;
164 //const Float_t AliTRDgeometry::fgkWaZpos = 1.3325;
165 const Float_t AliTRDgeometry::fgkFeZpos = 1.2853;
166 const Float_t AliTRDgeometry::fgkCoZpos = 1.2975;
167 const Float_t AliTRDgeometry::fgkWaZpos = 1.3175;
169 //_____________________________________________________________________________
170 AliTRDgeometry::AliTRDgeometry():AliGeometry()
173 // AliTRDgeometry default constructor
180 //_____________________________________________________________________________
181 AliTRDgeometry::~AliTRDgeometry()
184 // AliTRDgeometry destructor
189 //_____________________________________________________________________________
190 void AliTRDgeometry::Init()
193 // Initializes the geometry parameter
198 // The width of the chambers
206 // The maximum number of pads
207 // and the position of pad 0,0,0
209 // chambers seen from the top:
210 // +----------------------------+
216 // +----------------------------+ +------>
218 // chambers seen from the side: ^
219 // +----------------------------+ drift|
222 // +----------------------------+ +------>
225 // IMPORTANT: time bin 0 is now the first one in the drift region
226 // closest to the readout !!!
229 // The pad column (rphi-direction)
232 // The number of time bins. Default is 100 ns timbin size
235 // Additional time bins before and after the drift region.
236 // Default is to only sample the drift region
237 SetExpandTimeBin(0,0);
239 // The rotation matrix elements
241 for (isect = 0; isect < fgkNsect; isect++) {
242 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
243 fRotA11[isect] = TMath::Cos(phi);
244 fRotA12[isect] = TMath::Sin(phi);
245 fRotA21[isect] = TMath::Sin(phi);
246 fRotA22[isect] = TMath::Cos(phi);
248 fRotB11[isect] = TMath::Cos(phi);
249 fRotB12[isect] = TMath::Sin(phi);
250 fRotB21[isect] = TMath::Sin(phi);
251 fRotB22[isect] = TMath::Cos(phi);
256 //_____________________________________________________________________________
257 void AliTRDgeometry::SetNColPad(const Int_t npad)
260 // Redefines the number of pads in column direction
263 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
264 fColMax[iplan] = npad;
265 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
266 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
271 //_____________________________________________________________________________
272 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
275 // Redefines the number of time bins in the drift region.
276 // The time bin width is defined by the length of the
277 // drift region divided by <nbin>.
281 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
282 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
283 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
284 + iplan * (fgkCheight + fgkCspace);
289 //_____________________________________________________________________________
290 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
293 // Create the TRD geometry
295 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
298 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
299 // To be placed into the spaceframe.
301 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
302 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
303 // (driftchamber + radiator)
304 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
305 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
306 // inner(/middle/outer) chambers
308 // The material layers in one chamber:
309 // UL03 (Rohacell) --- The radiator
310 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
311 // UL05 (Xe) --- The driftvolume
312 // UL06 (Xe) --- The amplification region
314 // UL07 (Cu) --- The pad plane
315 // UL08 (G10) --- The Nomex honeycomb support structure
316 // UL09 (Cu) --- FEE and signal lines
317 // UL10 (Al) --- The cooling devices
318 // UL11 (Water) --- The cooling water
320 const Int_t kNparCha = 3;
323 Float_t parCha[kNparCha];
325 Float_t xpos, ypos, zpos;
327 // The aluminum frames - readout + electronics (Al)
328 // The inner chambers
329 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
330 // The middle chambers
331 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
332 // The outer chambers
333 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
335 // The inner part of the aluminum frames (Air)
336 // The inner chambers
337 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
338 // The middle chambers
339 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
340 // The outer chambers
341 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
343 // The carbon frames - radiator + driftchamber (C)
344 // The inner chambers
345 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
346 // The middle chambers
347 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
348 // The outer chambers
349 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
351 // The inner part of the carbon frames (Air)
352 // The inner chambers
353 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
354 // The middle chambers
355 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
356 // The outer chambers
357 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
359 // The material layers inside the chambers
362 // Rohacell layer (radiator)
363 parCha[2] = fgkRaThick/2;
364 gMC->Gsvolu("UL03","BOX ",idtmed[1315-1],parCha,kNparCha);
365 // Mylar layer (entrance window + HV cathode)
366 parCha[2] = fgkMyThick/2;
367 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
368 // Xe/Isobutane layer (drift volume)
369 parCha[2] = fgkDrThick/2.;
370 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
371 // Xe/Isobutane layer (amplification volume)
372 parCha[2] = fgkAmThick/2.;
373 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
375 // Cu layer (pad plane)
376 parCha[2] = fgkCuThick/2;
377 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
378 // G10 layer (support structure)
379 parCha[2] = fgkSuThick/2;
380 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
381 // Cu layer (FEE + signal lines)
382 parCha[2] = fgkFeThick/2;
383 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
384 // Al layer (cooling devices)
385 parCha[2] = fgkCoThick/2;
386 gMC->Gsvolu("UL10","BOX ",idtmed[1301-1],parCha,kNparCha);
387 // Water layer (cooling)
388 parCha[2] = fgkWaThick/2;
389 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
391 // Position the layers in the chambers
395 // Rohacell layer (radiator)
397 gMC->Gspos("UL03",1,"UCII",xpos,ypos,zpos,0,"ONLY");
398 gMC->Gspos("UL03",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
399 gMC->Gspos("UL03",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
400 // Mylar layer (entrance window + HV cathode)
402 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
403 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
404 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
405 // Xe/Isobutane layer (drift volume)
407 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
408 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
409 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
410 // Xe/Isobutane layer (amplification volume)
412 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
413 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
414 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
415 // Cu layer (pad plane)
417 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
418 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
419 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
420 // G10 layer (support structure)
422 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
423 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
424 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
425 // Cu layer (FEE + signal lines)
427 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
428 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
429 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
430 // Al layer (cooling devices)
432 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
433 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
434 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
435 // Water layer (cooling)
437 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
438 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
439 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
443 //_____________________________________________________________________________
444 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
447 // Converts local pad-coordinates (row,col,time) into
448 // global ALICE reference frame coordinates (x,y,z)
451 Int_t icham = GetChamber(idet); // Chamber info (0-4)
452 Int_t isect = GetSector(idet); // Sector info (0-17)
453 Int_t iplan = GetPlane(idet); // Plane info (0-5)
455 return Local2Global(iplan,icham,isect,local,global);
459 //_____________________________________________________________________________
460 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
461 , Float_t *local, Float_t *global) const
464 // Converts local pad-coordinates (row,col,time) into
465 // global ALICE reference frame coordinates (x,y,z)
468 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
470 Float_t padRow = local[0]; // Pad Row position
471 Float_t padCol = local[1]; // Pad Column position
472 Float_t timeSlice = local[2]; // Time "position"
474 Float_t row0 = GetRow0(iplan,icham,isect);
475 Float_t col0 = GetCol0(iplan);
476 Float_t time0 = GetTime0(iplan);
480 // calculate (x,y,z) position in rotated chamber
481 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
482 rot[1] = col0 + padCol * fColPadSize[iplan];
483 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
485 // Rotate back to original position
486 return RotateBack(idet,rot,global);
490 //_____________________________________________________________________________
491 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
494 // Rotates all chambers in the position of sector 0 and transforms
495 // the coordinates in the ALICE restframe <pos> into the
496 // corresponding local frame <rot>.
499 Int_t sector = GetSector(d);
501 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
502 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
509 //_____________________________________________________________________________
510 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
513 // Rotates a chambers from the position of sector 0 into its
514 // original position and transforms the corresponding local frame
515 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
518 Int_t sector = GetSector(d);
520 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
521 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
528 //_____________________________________________________________________________
529 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
532 // Convert plane / chamber / sector into detector number
535 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
539 //_____________________________________________________________________________
540 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
543 // Reconstruct the plane number from the detector number
546 return ((Int_t) (d % fgkNplan));
550 //_____________________________________________________________________________
551 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
554 // Reconstruct the chamber number from the detector number
557 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
561 //_____________________________________________________________________________
562 Int_t AliTRDgeometry::GetSector(const Int_t d) const
565 // Reconstruct the sector number from the detector number
568 return ((Int_t) (d / (fgkNplan * fgkNcham)));
572 //_____________________________________________________________________________
573 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
574 , TMatrix &mat) const
577 // Returns the global coordinate and error matrix of a AliTRDrecPoint
585 //_____________________________________________________________________________
586 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
589 // Returns the global coordinate and error matrix of a AliTRDrecPoint
592 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
596 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
597 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
598 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
600 if (Local2Global(detector,local,global)) {