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 1.9 2001/03/27 12:48:33 cblume
19 Correct for volume overlaps
21 Revision 1.8 2001/03/13 09:30:35 cblume
22 Update of digitization. Moved digit branch definition to AliTRD
24 Revision 1.7 2001/02/14 18:22:26 cblume
25 Change in the geometry of the padplane
27 Revision 1.6 2000/11/01 14:53:20 cblume
28 Merge with TRD-develop
30 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
31 Changed timebin 0 to be the one closest to the readout
33 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
34 Include geometry constants as static member
36 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
39 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
40 Replace include files by forward declarations
42 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
43 Allow the pad/timebin-dimensions to be changed after initialization
45 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
46 Minor coding corrections
48 Revision 1.5 2000/10/02 21:28:19 fca
49 Removal of useless dependecies via forward declarations
51 Revision 1.4 2000/06/08 18:32:58 cblume
52 Make code compliant to coding conventions
54 Revision 1.3 2000/06/07 16:25:37 cblume
55 Try to remove compiler warnings on Sun and HP
57 Revision 1.2 2000/05/08 16:17:27 cblume
60 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
61 Bug fix in RotateBack(). Geometry update
63 Revision 1.4 2000/06/08 18:32:58 cblume
64 Make code compliant to coding conventions
66 Revision 1.3 2000/06/07 16:25:37 cblume
67 Try to remove compiler warnings on Sun and HP
69 Revision 1.2 2000/05/08 16:17:27 cblume
72 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
73 Bug fix in RotateBack(). Geometry update
75 Revision 1.1 2000/02/28 19:00:44 cblume
80 ///////////////////////////////////////////////////////////////////////////////
82 // TRD geometry class //
84 ///////////////////////////////////////////////////////////////////////////////
88 #include "AliTRDgeometry.h"
89 #include "AliTRDrecPoint.h"
92 ClassImp(AliTRDgeometry)
94 //_____________________________________________________________________________
97 // The geometry constants
99 const Int_t AliTRDgeometry::fgkNsect = kNsect;
100 const Int_t AliTRDgeometry::fgkNplan = kNplan;
101 const Int_t AliTRDgeometry::fgkNcham = kNcham;
102 const Int_t AliTRDgeometry::fgkNdet = kNdet;
105 // Dimensions of the detector
107 const Float_t AliTRDgeometry::fgkRmin = 294.0;
108 const Float_t AliTRDgeometry::fgkRmax = 368.0;
110 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
111 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
113 const Float_t AliTRDgeometry::fgkSheight = 74.0;
114 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
115 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
116 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
117 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
118 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
120 const Float_t AliTRDgeometry::fgkCheight = 11.0;
121 const Float_t AliTRDgeometry::fgkCspace = 1.6;
122 const Float_t AliTRDgeometry::fgkCathick = 1.0;
123 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
124 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
125 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
126 - AliTRDgeometry::fgkCaframe;
129 // Thickness of the the material layers
131 const Float_t AliTRDgeometry::fgkSeThick = 0.02;
132 const Float_t AliTRDgeometry::fgkRaThick = 4.78;
133 const Float_t AliTRDgeometry::fgkPeThick = 0.20;
134 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
135 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
136 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
137 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
138 - AliTRDgeometry::fgkDrThick;
139 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
140 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
141 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
142 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
143 const Float_t AliTRDgeometry::fgkWaThick = 0.01;
146 // Position of the material layers
148 const Float_t AliTRDgeometry::fgkSeZpos = -4.14;
149 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
150 const Float_t AliTRDgeometry::fgkPeZpos = 0.0000;
151 const Float_t AliTRDgeometry::fgkMyZpos = 0.6550;
152 const Float_t AliTRDgeometry::fgkDrZpos = 2.1600;
153 const Float_t AliTRDgeometry::fgkAmZpos = 3.9100;
154 const Float_t AliTRDgeometry::fgkCuZpos = -1.3370;
155 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
156 const Float_t AliTRDgeometry::fgkFeZpos = 1.3053;
157 const Float_t AliTRDgeometry::fgkCoZpos = 1.3175;
158 const Float_t AliTRDgeometry::fgkWaZpos = 1.3325;
160 //_____________________________________________________________________________
161 AliTRDgeometry::AliTRDgeometry():AliGeometry()
164 // AliTRDgeometry default constructor
171 //_____________________________________________________________________________
172 AliTRDgeometry::~AliTRDgeometry()
175 // AliTRDgeometry destructor
180 //_____________________________________________________________________________
181 void AliTRDgeometry::Init()
184 // Initializes the geometry parameter
189 // The width of the chambers
197 // The maximum number of pads
198 // and the position of pad 0,0,0
200 // chambers seen from the top:
201 // +----------------------------+
207 // +----------------------------+ +------>
209 // chambers seen from the side: ^
210 // +----------------------------+ drift|
213 // +----------------------------+ +------>
216 // IMPORTANT: time bin 0 is now the first one in the drift region
217 // closest to the readout !!!
220 // The pad column (rphi-direction)
223 // The number of time bins. Default is 100 ns timbin size
226 // Additional time bins before and after the drift region.
227 // Default is to only sample the drift region
228 SetExpandTimeBin(0,0);
230 // The rotation matrix elements
232 for (isect = 0; isect < fgkNsect; isect++) {
233 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
234 fRotA11[isect] = TMath::Cos(phi);
235 fRotA12[isect] = TMath::Sin(phi);
236 fRotA21[isect] = TMath::Sin(phi);
237 fRotA22[isect] = TMath::Cos(phi);
239 fRotB11[isect] = TMath::Cos(phi);
240 fRotB12[isect] = TMath::Sin(phi);
241 fRotB21[isect] = TMath::Sin(phi);
242 fRotB22[isect] = TMath::Cos(phi);
247 //_____________________________________________________________________________
248 void AliTRDgeometry::SetNColPad(const Int_t npad)
251 // Redefines the number of pads in column direction
254 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
255 fColMax[iplan] = npad;
256 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
257 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
262 //_____________________________________________________________________________
263 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
266 // Redefines the number of time bins in the drift region.
267 // The time bin width is defined by the length of the
268 // drift region divided by <nbin>.
272 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
273 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
274 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
275 + iplan * (fgkCheight + fgkCspace);
280 //_____________________________________________________________________________
281 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
284 // Create the TRD geometry
286 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
289 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
290 // To be placed into the spaceframe.
292 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
293 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
294 // (driftchamber + radiator)
295 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
296 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
297 // inner(/middle/outer) chambers
299 // The material layers in one chamber:
300 // UL01 (G10) --- The gas seal of the radiator
301 // UL02 (CO2) --- The gas in the radiator
302 // UL03 (PE) --- The foil stack
303 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
304 // UL05 (Xe) --- The driftvolume
305 // UL06 (Xe) --- The amplification region
307 // UL07 (Cu) --- The pad plane
308 // UL08 (G10) --- The Nomex honeycomb support structure
309 // UL09 (Cu) --- FEE and signal lines
310 // UL10 (PE) --- The cooling devices
311 // UL11 (Water) --- The cooling water
313 const Int_t kNparCha = 3;
316 Float_t parCha[kNparCha];
318 Float_t xpos, ypos, zpos;
320 // The aluminum frames - readout + electronics (Al)
321 // The inner chambers
322 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
323 // The middle chambers
324 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
325 // The outer chambers
326 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
328 // The inner part of the aluminum frames (Air)
329 // The inner chambers
330 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
331 // The middle chambers
332 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
333 // The outer chambers
334 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
336 // The carbon frames - radiator + driftchamber (C)
337 // The inner chambers
338 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
339 // The middle chambers
340 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
341 // The outer chambers
342 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
344 // The inner part of the carbon frames (Air)
345 // The inner chambers
346 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
347 // The middle chambers
348 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
349 // The outer chambers
350 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
352 // The material layers inside the chambers
355 // G10 layer (radiator seal)
356 parCha[2] = fgkSeThick/2;
357 gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],parCha,kNparCha);
358 // CO2 layer (radiator)
359 parCha[2] = fgkRaThick/2;
360 gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],parCha,kNparCha);
361 // PE layer (radiator)
362 parCha[2] = fgkPeThick/2;
363 gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],parCha,kNparCha);
364 // Mylar layer (entrance window + HV cathode)
365 parCha[2] = fgkMyThick/2;
366 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
367 // Xe/Isobutane layer (drift volume, sensitive)
368 parCha[2] = fgkDrThick/2.;
369 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
370 // Xe/Isobutane layer (amplification volume, not sensitive)
371 parCha[2] = fgkAmThick/2.;
372 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
374 // Cu layer (pad plane)
375 parCha[2] = fgkCuThick/2;
376 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
377 // G10 layer (support structure)
378 parCha[2] = fgkSuThick/2;
379 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
380 // Cu layer (FEE + signal lines)
381 parCha[2] = fgkFeThick/2;
382 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
383 // PE layer (cooling devices)
384 parCha[2] = fgkCoThick/2;
385 gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],parCha,kNparCha);
386 // Water layer (cooling)
387 parCha[2] = fgkWaThick/2;
388 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
390 // Position the layers in the chambers
394 // G10 layer (radiator seal)
396 gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY");
397 gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
398 gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
399 // CO2 layer (radiator)
401 gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY");
402 gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
403 gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
404 // PE layer (radiator)
406 gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY");
407 // Mylar layer (entrance window + HV cathode)
409 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
410 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
411 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
412 // Xe/Isobutane layer (drift volume)
414 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
415 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
416 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
417 // Xe/Isobutane layer (amplification volume)
419 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
420 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
421 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
423 // Cu layer (pad plane)
425 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
426 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
427 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
428 // G10 layer (support structure)
430 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
431 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
432 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
433 // Cu layer (FEE + signal lines)
435 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
436 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
437 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
438 // PE layer (cooling devices)
440 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
441 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
442 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
443 // Water layer (cooling)
445 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
446 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
447 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
451 //_____________________________________________________________________________
452 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
455 // Converts local pad-coordinates (row,col,time) into
456 // global ALICE reference frame coordinates (x,y,z)
459 Int_t icham = GetChamber(idet); // Chamber info (0-4)
460 Int_t isect = GetSector(idet); // Sector info (0-17)
461 Int_t iplan = GetPlane(idet); // Plane info (0-5)
463 return Local2Global(iplan,icham,isect,local,global);
467 //_____________________________________________________________________________
468 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
469 , Float_t *local, Float_t *global) const
472 // Converts local pad-coordinates (row,col,time) into
473 // global ALICE reference frame coordinates (x,y,z)
476 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
478 Float_t padRow = local[0]; // Pad Row position
479 Float_t padCol = local[1]; // Pad Column position
480 Float_t timeSlice = local[2]; // Time "position"
482 Float_t row0 = GetRow0(iplan,icham,isect);
483 Float_t col0 = GetCol0(iplan);
484 Float_t time0 = GetTime0(iplan);
488 // calculate (x,y,z) position in rotated chamber
489 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
490 rot[1] = col0 + padCol * fColPadSize[iplan];
491 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
493 // Rotate back to original position
494 return RotateBack(idet,rot,global);
498 //_____________________________________________________________________________
499 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
502 // Rotates all chambers in the position of sector 0 and transforms
503 // the coordinates in the ALICE restframe <pos> into the
504 // corresponding local frame <rot>.
507 Int_t sector = GetSector(d);
509 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
510 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
517 //_____________________________________________________________________________
518 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
521 // Rotates a chambers from the position of sector 0 into its
522 // original position and transforms the corresponding local frame
523 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
526 Int_t sector = GetSector(d);
528 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
529 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
536 //_____________________________________________________________________________
537 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
540 // Convert plane / chamber / sector into detector number
543 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
547 //_____________________________________________________________________________
548 Int_t AliTRDgeometry::GetPlane(Int_t d) const
551 // Reconstruct the plane number from the detector number
554 return ((Int_t) (d % fgkNplan));
558 //_____________________________________________________________________________
559 Int_t AliTRDgeometry::GetChamber(Int_t d) const
562 // Reconstruct the chamber number from the detector number
565 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
569 //_____________________________________________________________________________
570 Int_t AliTRDgeometry::GetSector(Int_t d) const
573 // Reconstruct the sector number from the detector number
576 return ((Int_t) (d / (fgkNplan * fgkNcham)));
580 //_____________________________________________________________________________
581 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
582 , TMatrix &mat) const
585 // Returns the global coordinate and error matrix of a AliTRDrecPoint
593 //_____________________________________________________________________________
594 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
597 // Returns the global coordinate and error matrix of a AliTRDrecPoint
600 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
604 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
605 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
606 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
608 if (Local2Global(detector,local,global)) {