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 1.13 2001/08/02 08:30:45 cblume
19 Fix positions of cooling material
21 Revision 1.12 2001/05/21 16:45:47 hristov
22 Last minute changes (C.Blume)
24 Revision 1.11 2001/05/11 07:56:12 hristov
25 Consistent declarations needed on Alpha
27 Revision 1.10 2001/05/07 08:08:05 cblume
30 Revision 1.9 2001/03/27 12:48:33 cblume
31 Correct for volume overlaps
33 Revision 1.8 2001/03/13 09:30:35 cblume
34 Update of digitization. Moved digit branch definition to AliTRD
36 Revision 1.7 2001/02/14 18:22:26 cblume
37 Change in the geometry of the padplane
39 Revision 1.6 2000/11/01 14:53:20 cblume
40 Merge with TRD-develop
42 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
43 Changed timebin 0 to be the one closest to the readout
45 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
46 Include geometry constants as static member
48 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
51 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
52 Replace include files by forward declarations
54 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
55 Allow the pad/timebin-dimensions to be changed after initialization
57 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
58 Minor coding corrections
60 Revision 1.5 2000/10/02 21:28:19 fca
61 Removal of useless dependecies via forward declarations
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 1.4 2000/06/08 18:32:58 cblume
76 Make code compliant to coding conventions
78 Revision 1.3 2000/06/07 16:25:37 cblume
79 Try to remove compiler warnings on Sun and HP
81 Revision 1.2 2000/05/08 16:17:27 cblume
84 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
85 Bug fix in RotateBack(). Geometry update
87 Revision 1.1 2000/02/28 19:00:44 cblume
92 ///////////////////////////////////////////////////////////////////////////////
94 // TRD geometry class //
96 ///////////////////////////////////////////////////////////////////////////////
100 #include "AliTRDgeometry.h"
101 #include "AliTRDrecPoint.h"
104 ClassImp(AliTRDgeometry)
106 //_____________________________________________________________________________
109 // The geometry constants
111 const Int_t AliTRDgeometry::fgkNsect = kNsect;
112 const Int_t AliTRDgeometry::fgkNplan = kNplan;
113 const Int_t AliTRDgeometry::fgkNcham = kNcham;
114 const Int_t AliTRDgeometry::fgkNdet = kNdet;
117 // Dimensions of the detector
119 const Float_t AliTRDgeometry::fgkRmin = 294.0;
120 const Float_t AliTRDgeometry::fgkRmax = 368.0;
122 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
123 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
125 const Float_t AliTRDgeometry::fgkSheight = 74.0;
126 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
127 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
128 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
129 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
130 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
132 const Float_t AliTRDgeometry::fgkCheight = 11.0;
133 const Float_t AliTRDgeometry::fgkCspace = 1.6;
134 const Float_t AliTRDgeometry::fgkCathick = 1.0;
135 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
136 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
137 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
138 - AliTRDgeometry::fgkCaframe;
141 // Thickness of the the material layers
143 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
144 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
145 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
146 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
147 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
148 - AliTRDgeometry::fgkDrThick;
149 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
150 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
151 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
152 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
153 //const Float_t AliTRDgeometry::fgkWaThick = 0.01;
154 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
157 // Position of the material layers
159 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
160 const Float_t AliTRDgeometry::fgkMyZpos = 0.6550;
161 const Float_t AliTRDgeometry::fgkDrZpos = 2.1600;
162 const Float_t AliTRDgeometry::fgkAmZpos = 3.9100;
163 const Float_t AliTRDgeometry::fgkCuZpos = -1.3370;
164 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
165 //const Float_t AliTRDgeometry::fgkFeZpos = 1.3053;
166 //const Float_t AliTRDgeometry::fgkCoZpos = 1.3175;
167 //const Float_t AliTRDgeometry::fgkWaZpos = 1.3325;
168 const Float_t AliTRDgeometry::fgkFeZpos = 1.2853;
169 const Float_t AliTRDgeometry::fgkCoZpos = 1.2975;
170 const Float_t AliTRDgeometry::fgkWaZpos = 1.3175;
172 //_____________________________________________________________________________
173 AliTRDgeometry::AliTRDgeometry():AliGeometry()
176 // AliTRDgeometry default constructor
183 //_____________________________________________________________________________
184 AliTRDgeometry::~AliTRDgeometry()
187 // AliTRDgeometry destructor
192 //_____________________________________________________________________________
193 void AliTRDgeometry::Init()
196 // Initializes the geometry parameter
201 // The width of the chambers
209 // The maximum number of pads
210 // and the position of pad 0,0,0
212 // chambers seen from the top:
213 // +----------------------------+
219 // +----------------------------+ +------>
221 // chambers seen from the side: ^
222 // +----------------------------+ drift|
225 // +----------------------------+ +------>
228 // IMPORTANT: time bin 0 is now the first one in the drift region
229 // closest to the readout !!!
232 // The pad column (rphi-direction)
235 // The number of time bins. Default is 100 ns timbin size
238 // Additional time bins before and after the drift region.
239 // Default is to only sample the drift region
240 SetExpandTimeBin(0,0);
242 // The rotation matrix elements
244 for (isect = 0; isect < fgkNsect; isect++) {
245 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
246 fRotA11[isect] = TMath::Cos(phi);
247 fRotA12[isect] = TMath::Sin(phi);
248 fRotA21[isect] = TMath::Sin(phi);
249 fRotA22[isect] = TMath::Cos(phi);
251 fRotB11[isect] = TMath::Cos(phi);
252 fRotB12[isect] = TMath::Sin(phi);
253 fRotB21[isect] = TMath::Sin(phi);
254 fRotB22[isect] = TMath::Cos(phi);
259 //_____________________________________________________________________________
260 void AliTRDgeometry::SetNColPad(const Int_t npad)
263 // Redefines the number of pads in column direction
266 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
267 fColMax[iplan] = npad;
268 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
269 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
274 //_____________________________________________________________________________
275 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
278 // Redefines the number of time bins in the drift region.
279 // The time bin width is defined by the length of the
280 // drift region divided by <nbin>.
284 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
285 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
286 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
287 + iplan * (fgkCheight + fgkCspace);
292 //_____________________________________________________________________________
293 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
296 // Create the TRD geometry
298 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
301 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
302 // To be placed into the spaceframe.
304 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
305 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
306 // (driftchamber + radiator)
307 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
308 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
309 // inner(/middle/outer) chambers
311 // The material layers in one chamber:
312 // UL03 (Rohacell) --- The radiator
313 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
314 // UL05 (Xe) --- The driftvolume
315 // UL06 (Xe) --- The amplification region
317 // UL07 (Cu) --- The pad plane
318 // UL08 (G10) --- The Nomex honeycomb support structure
319 // UL09 (Cu) --- FEE and signal lines
320 // UL10 (Al) --- The cooling devices
321 // UL11 (Water) --- The cooling water
323 const Int_t kNparCha = 3;
326 Float_t parCha[kNparCha];
328 Float_t xpos, ypos, zpos;
330 // The aluminum frames - readout + electronics (Al)
331 // The inner chambers
332 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
333 // The middle chambers
334 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
335 // The outer chambers
336 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
338 // The inner part of the aluminum frames (Air)
339 // The inner chambers
340 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
341 // The middle chambers
342 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
343 // The outer chambers
344 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
346 // The carbon frames - radiator + driftchamber (C)
347 // The inner chambers
348 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
349 // The middle chambers
350 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
351 // The outer chambers
352 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
354 // The inner part of the carbon frames (Air)
355 // The inner chambers
356 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
357 // The middle chambers
358 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
359 // The outer chambers
360 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
362 // The material layers inside the chambers
365 // Rohacell layer (radiator)
366 parCha[2] = fgkRaThick/2;
367 gMC->Gsvolu("UL03","BOX ",idtmed[1315-1],parCha,kNparCha);
368 // Mylar layer (entrance window + HV cathode)
369 parCha[2] = fgkMyThick/2;
370 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
371 // Xe/Isobutane layer (drift volume)
372 parCha[2] = fgkDrThick/2.;
373 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
374 // Xe/Isobutane layer (amplification volume)
375 parCha[2] = fgkAmThick/2.;
376 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
378 // Cu layer (pad plane)
379 parCha[2] = fgkCuThick/2;
380 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
381 // G10 layer (support structure)
382 parCha[2] = fgkSuThick/2;
383 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
384 // Cu layer (FEE + signal lines)
385 parCha[2] = fgkFeThick/2;
386 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
387 // Al layer (cooling devices)
388 parCha[2] = fgkCoThick/2;
389 gMC->Gsvolu("UL10","BOX ",idtmed[1301-1],parCha,kNparCha);
390 // Water layer (cooling)
391 parCha[2] = fgkWaThick/2;
392 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
394 // Position the layers in the chambers
398 // Rohacell layer (radiator)
400 gMC->Gspos("UL03",1,"UCII",xpos,ypos,zpos,0,"ONLY");
401 gMC->Gspos("UL03",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
402 gMC->Gspos("UL03",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
403 // Mylar layer (entrance window + HV cathode)
405 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
406 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
407 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
408 // Xe/Isobutane layer (drift volume)
410 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
411 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
412 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
413 // Xe/Isobutane layer (amplification volume)
415 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
416 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
417 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
418 // Cu layer (pad plane)
420 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
421 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
422 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
423 // G10 layer (support structure)
425 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
426 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
427 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
428 // Cu layer (FEE + signal lines)
430 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
431 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
432 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
433 // Al layer (cooling devices)
435 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
436 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
437 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
438 // Water layer (cooling)
440 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
441 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
442 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
446 //_____________________________________________________________________________
447 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
450 // Converts local pad-coordinates (row,col,time) into
451 // global ALICE reference frame coordinates (x,y,z)
454 Int_t icham = GetChamber(idet); // Chamber info (0-4)
455 Int_t isect = GetSector(idet); // Sector info (0-17)
456 Int_t iplan = GetPlane(idet); // Plane info (0-5)
458 return Local2Global(iplan,icham,isect,local,global);
462 //_____________________________________________________________________________
463 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
464 , Float_t *local, Float_t *global) const
467 // Converts local pad-coordinates (row,col,time) into
468 // global ALICE reference frame coordinates (x,y,z)
471 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
473 Float_t padRow = local[0]+0.5; // Pad Row position
474 Float_t padCol = local[1]+0.5; // Pad Column position
475 Float_t timeSlice = local[2]+0.5; // Time "position"
477 Float_t row0 = GetRow0(iplan,icham,isect);
478 Float_t col0 = GetCol0(iplan);
479 Float_t time0 = GetTime0(iplan);
483 // calculate (x,y,z) position in rotated chamber
484 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
485 rot[1] = col0 + padCol * fColPadSize[iplan];
486 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
488 // Rotate back to original position
489 return RotateBack(idet,rot,global);
493 //_____________________________________________________________________________
494 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
497 // Rotates all chambers in the position of sector 0 and transforms
498 // the coordinates in the ALICE restframe <pos> into the
499 // corresponding local frame <rot>.
502 Int_t sector = GetSector(d);
504 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
505 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
512 //_____________________________________________________________________________
513 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
516 // Rotates a chambers from the position of sector 0 into its
517 // original position and transforms the corresponding local frame
518 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
521 Int_t sector = GetSector(d);
523 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
524 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
531 //_____________________________________________________________________________
532 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
535 // Convert plane / chamber / sector into detector number
538 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
542 //_____________________________________________________________________________
543 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
546 // Reconstruct the plane number from the detector number
549 return ((Int_t) (d % fgkNplan));
553 //_____________________________________________________________________________
554 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
557 // Reconstruct the chamber number from the detector number
560 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
564 //_____________________________________________________________________________
565 Int_t AliTRDgeometry::GetSector(const Int_t d) const
568 // Reconstruct the sector number from the detector number
571 return ((Int_t) (d / (fgkNplan * fgkNcham)));
575 //_____________________________________________________________________________
576 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
577 , TMatrix &mat) const
580 // Returns the global coordinate and error matrix of a AliTRDrecPoint
588 //_____________________________________________________________________________
589 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
592 // Returns the global coordinate and error matrix of a AliTRDrecPoint
595 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
599 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
600 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
601 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
603 if (Local2Global(detector,local,global)) {