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 1.11 2001/05/11 07:56:12 hristov
19 Consistent declarations needed on Alpha
21 Revision 1.10 2001/05/07 08:08:05 cblume
24 Revision 1.9 2001/03/27 12:48:33 cblume
25 Correct for volume overlaps
27 Revision 1.8 2001/03/13 09:30:35 cblume
28 Update of digitization. Moved digit branch definition to AliTRD
30 Revision 1.7 2001/02/14 18:22:26 cblume
31 Change in the geometry of the padplane
33 Revision 1.6 2000/11/01 14:53:20 cblume
34 Merge with TRD-develop
36 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
37 Changed timebin 0 to be the one closest to the readout
39 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
40 Include geometry constants as static member
42 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
45 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
46 Replace include files by forward declarations
48 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
49 Allow the pad/timebin-dimensions to be changed after initialization
51 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
52 Minor coding corrections
54 Revision 1.5 2000/10/02 21:28:19 fca
55 Removal of useless dependecies via forward declarations
57 Revision 1.4 2000/06/08 18:32:58 cblume
58 Make code compliant to coding conventions
60 Revision 1.3 2000/06/07 16:25:37 cblume
61 Try to remove compiler warnings on Sun and HP
63 Revision 1.2 2000/05/08 16:17:27 cblume
66 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
67 Bug fix in RotateBack(). Geometry update
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 1.1 2000/02/28 19:00:44 cblume
86 ///////////////////////////////////////////////////////////////////////////////
88 // TRD geometry class //
90 ///////////////////////////////////////////////////////////////////////////////
94 #include "AliTRDgeometry.h"
95 #include "AliTRDrecPoint.h"
98 ClassImp(AliTRDgeometry)
100 //_____________________________________________________________________________
103 // The geometry constants
105 const Int_t AliTRDgeometry::fgkNsect = kNsect;
106 const Int_t AliTRDgeometry::fgkNplan = kNplan;
107 const Int_t AliTRDgeometry::fgkNcham = kNcham;
108 const Int_t AliTRDgeometry::fgkNdet = kNdet;
111 // Dimensions of the detector
113 const Float_t AliTRDgeometry::fgkRmin = 294.0;
114 const Float_t AliTRDgeometry::fgkRmax = 368.0;
116 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
117 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
119 const Float_t AliTRDgeometry::fgkSheight = 74.0;
120 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
121 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
122 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
123 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
124 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
126 const Float_t AliTRDgeometry::fgkCheight = 11.0;
127 const Float_t AliTRDgeometry::fgkCspace = 1.6;
128 const Float_t AliTRDgeometry::fgkCathick = 1.0;
129 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
130 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
131 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
132 - AliTRDgeometry::fgkCaframe;
135 // Thickness of the the material layers
137 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
138 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
139 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
140 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
141 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
142 - AliTRDgeometry::fgkDrThick;
143 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
144 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
145 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
146 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
147 //const Float_t AliTRDgeometry::fgkWaThick = 0.01;
148 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
151 // Position of the material layers
153 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
154 const Float_t AliTRDgeometry::fgkMyZpos = 0.6550;
155 const Float_t AliTRDgeometry::fgkDrZpos = 2.1600;
156 const Float_t AliTRDgeometry::fgkAmZpos = 3.9100;
157 const Float_t AliTRDgeometry::fgkCuZpos = -1.3370;
158 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
159 const Float_t AliTRDgeometry::fgkFeZpos = 1.3053;
160 const Float_t AliTRDgeometry::fgkCoZpos = 1.3175;
161 //const Float_t AliTRDgeometry::fgkWaZpos = 1.3325;
162 const Float_t AliTRDgeometry::fgkWaZpos = 1.3375;
164 //_____________________________________________________________________________
165 AliTRDgeometry::AliTRDgeometry():AliGeometry()
168 // AliTRDgeometry default constructor
175 //_____________________________________________________________________________
176 AliTRDgeometry::~AliTRDgeometry()
179 // AliTRDgeometry destructor
184 //_____________________________________________________________________________
185 void AliTRDgeometry::Init()
188 // Initializes the geometry parameter
193 // The width of the chambers
201 // The maximum number of pads
202 // and the position of pad 0,0,0
204 // chambers seen from the top:
205 // +----------------------------+
211 // +----------------------------+ +------>
213 // chambers seen from the side: ^
214 // +----------------------------+ drift|
217 // +----------------------------+ +------>
220 // IMPORTANT: time bin 0 is now the first one in the drift region
221 // closest to the readout !!!
224 // The pad column (rphi-direction)
227 // The number of time bins. Default is 100 ns timbin size
230 // Additional time bins before and after the drift region.
231 // Default is to only sample the drift region
232 SetExpandTimeBin(0,0);
234 // The rotation matrix elements
236 for (isect = 0; isect < fgkNsect; isect++) {
237 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
238 fRotA11[isect] = TMath::Cos(phi);
239 fRotA12[isect] = TMath::Sin(phi);
240 fRotA21[isect] = TMath::Sin(phi);
241 fRotA22[isect] = TMath::Cos(phi);
243 fRotB11[isect] = TMath::Cos(phi);
244 fRotB12[isect] = TMath::Sin(phi);
245 fRotB21[isect] = TMath::Sin(phi);
246 fRotB22[isect] = TMath::Cos(phi);
251 //_____________________________________________________________________________
252 void AliTRDgeometry::SetNColPad(const Int_t npad)
255 // Redefines the number of pads in column direction
258 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
259 fColMax[iplan] = npad;
260 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
261 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
266 //_____________________________________________________________________________
267 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
270 // Redefines the number of time bins in the drift region.
271 // The time bin width is defined by the length of the
272 // drift region divided by <nbin>.
276 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
277 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
278 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
279 + iplan * (fgkCheight + fgkCspace);
284 //_____________________________________________________________________________
285 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
288 // Create the TRD geometry
290 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
293 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
294 // To be placed into the spaceframe.
296 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
297 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
298 // (driftchamber + radiator)
299 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
300 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
301 // inner(/middle/outer) chambers
303 // The material layers in one chamber:
304 // UL03 (Rohacell) --- The radiator
305 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
306 // UL05 (Xe) --- The driftvolume
307 // UL06 (Xe) --- The amplification region
309 // UL07 (Cu) --- The pad plane
310 // UL08 (G10) --- The Nomex honeycomb support structure
311 // UL09 (Cu) --- FEE and signal lines
312 // UL10 (Al) --- The cooling devices
313 // UL11 (Water) --- The cooling water
315 const Int_t kNparCha = 3;
318 Float_t parCha[kNparCha];
320 Float_t xpos, ypos, zpos;
322 // The aluminum frames - readout + electronics (Al)
323 // The inner chambers
324 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
325 // The middle chambers
326 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
327 // The outer chambers
328 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
330 // The inner part of the aluminum frames (Air)
331 // The inner chambers
332 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
333 // The middle chambers
334 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
335 // The outer chambers
336 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
338 // The carbon frames - radiator + driftchamber (C)
339 // The inner chambers
340 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
341 // The middle chambers
342 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
343 // The outer chambers
344 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
346 // The inner part of the carbon frames (Air)
347 // The inner chambers
348 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
349 // The middle chambers
350 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
351 // The outer chambers
352 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
354 // The material layers inside the chambers
357 // Rohacell layer (radiator)
358 parCha[2] = fgkRaThick/2;
359 gMC->Gsvolu("UL03","BOX ",idtmed[1315-1],parCha,kNparCha);
360 // Mylar layer (entrance window + HV cathode)
361 parCha[2] = fgkMyThick/2;
362 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
363 // Xe/Isobutane layer (drift volume)
364 parCha[2] = fgkDrThick/2.;
365 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
366 // Xe/Isobutane layer (amplification volume)
367 parCha[2] = fgkAmThick/2.;
368 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
370 // Cu layer (pad plane)
371 parCha[2] = fgkCuThick/2;
372 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
373 // G10 layer (support structure)
374 parCha[2] = fgkSuThick/2;
375 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
376 // Cu layer (FEE + signal lines)
377 parCha[2] = fgkFeThick/2;
378 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
379 // Al layer (cooling devices)
380 parCha[2] = fgkCoThick/2;
381 gMC->Gsvolu("UL10","BOX ",idtmed[1301-1],parCha,kNparCha);
382 // Water layer (cooling)
383 parCha[2] = fgkWaThick/2;
384 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
386 // Position the layers in the chambers
390 // Rohacell layer (radiator)
392 gMC->Gspos("UL03",1,"UCII",xpos,ypos,zpos,0,"ONLY");
393 gMC->Gspos("UL03",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
394 gMC->Gspos("UL03",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
395 // Mylar layer (entrance window + HV cathode)
397 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
398 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
399 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
400 // Xe/Isobutane layer (drift volume)
402 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
403 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
404 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
405 // Xe/Isobutane layer (amplification volume)
407 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
408 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
409 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
410 // Cu layer (pad plane)
412 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
413 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
414 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
415 // G10 layer (support structure)
417 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
418 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
419 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
420 // Cu layer (FEE + signal lines)
422 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
423 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
424 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
425 // Al layer (cooling devices)
427 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
428 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
429 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
430 // Water layer (cooling)
432 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
433 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
434 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
438 //_____________________________________________________________________________
439 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
442 // Converts local pad-coordinates (row,col,time) into
443 // global ALICE reference frame coordinates (x,y,z)
446 Int_t icham = GetChamber(idet); // Chamber info (0-4)
447 Int_t isect = GetSector(idet); // Sector info (0-17)
448 Int_t iplan = GetPlane(idet); // Plane info (0-5)
450 return Local2Global(iplan,icham,isect,local,global);
454 //_____________________________________________________________________________
455 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
456 , Float_t *local, Float_t *global) const
459 // Converts local pad-coordinates (row,col,time) into
460 // global ALICE reference frame coordinates (x,y,z)
463 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
465 Float_t padRow = local[0]; // Pad Row position
466 Float_t padCol = local[1]; // Pad Column position
467 Float_t timeSlice = local[2]; // Time "position"
469 Float_t row0 = GetRow0(iplan,icham,isect);
470 Float_t col0 = GetCol0(iplan);
471 Float_t time0 = GetTime0(iplan);
475 // calculate (x,y,z) position in rotated chamber
476 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
477 rot[1] = col0 + padCol * fColPadSize[iplan];
478 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
480 // Rotate back to original position
481 return RotateBack(idet,rot,global);
485 //_____________________________________________________________________________
486 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
489 // Rotates all chambers in the position of sector 0 and transforms
490 // the coordinates in the ALICE restframe <pos> into the
491 // corresponding local frame <rot>.
494 Int_t sector = GetSector(d);
496 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
497 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
504 //_____________________________________________________________________________
505 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
508 // Rotates a chambers from the position of sector 0 into its
509 // original position and transforms the corresponding local frame
510 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
513 Int_t sector = GetSector(d);
515 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
516 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
523 //_____________________________________________________________________________
524 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
527 // Convert plane / chamber / sector into detector number
530 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
534 //_____________________________________________________________________________
535 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
538 // Reconstruct the plane number from the detector number
541 return ((Int_t) (d % fgkNplan));
545 //_____________________________________________________________________________
546 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
549 // Reconstruct the chamber number from the detector number
552 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
556 //_____________________________________________________________________________
557 Int_t AliTRDgeometry::GetSector(const Int_t d) const
560 // Reconstruct the sector number from the detector number
563 return ((Int_t) (d / (fgkNplan * fgkNcham)));
567 //_____________________________________________________________________________
568 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
569 , TMatrix &mat) const
572 // Returns the global coordinate and error matrix of a AliTRDrecPoint
580 //_____________________________________________________________________________
581 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
584 // Returns the global coordinate and error matrix of a AliTRDrecPoint
587 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
591 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
592 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
593 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
595 if (Local2Global(detector,local,global)) {