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 1.10 2001/05/07 08:08:05 cblume
21 Revision 1.9 2001/03/27 12:48:33 cblume
22 Correct for volume overlaps
24 Revision 1.8 2001/03/13 09:30:35 cblume
25 Update of digitization. Moved digit branch definition to AliTRD
27 Revision 1.7 2001/02/14 18:22:26 cblume
28 Change in the geometry of the padplane
30 Revision 1.6 2000/11/01 14:53:20 cblume
31 Merge with TRD-develop
33 Revision 1.1.4.7 2000/10/16 01:16:53 cblume
34 Changed timebin 0 to be the one closest to the readout
36 Revision 1.1.4.6 2000/10/15 23:35:57 cblume
37 Include geometry constants as static member
39 Revision 1.1.4.5 2000/10/06 16:49:46 cblume
42 Revision 1.1.4.4 2000/10/04 16:34:58 cblume
43 Replace include files by forward declarations
45 Revision 1.1.4.3 2000/09/22 14:43:40 cblume
46 Allow the pad/timebin-dimensions to be changed after initialization
48 Revision 1.1.4.2 2000/09/18 13:37:01 cblume
49 Minor coding corrections
51 Revision 1.5 2000/10/02 21:28:19 fca
52 Removal of useless dependecies via forward declarations
54 Revision 1.4 2000/06/08 18:32:58 cblume
55 Make code compliant to coding conventions
57 Revision 1.3 2000/06/07 16:25:37 cblume
58 Try to remove compiler warnings on Sun and HP
60 Revision 1.2 2000/05/08 16:17:27 cblume
63 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
64 Bug fix in RotateBack(). Geometry update
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 1.1 2000/02/28 19:00:44 cblume
83 ///////////////////////////////////////////////////////////////////////////////
85 // TRD geometry class //
87 ///////////////////////////////////////////////////////////////////////////////
91 #include "AliTRDgeometry.h"
92 #include "AliTRDrecPoint.h"
95 ClassImp(AliTRDgeometry)
97 //_____________________________________________________________________________
100 // The geometry constants
102 const Int_t AliTRDgeometry::fgkNsect = kNsect;
103 const Int_t AliTRDgeometry::fgkNplan = kNplan;
104 const Int_t AliTRDgeometry::fgkNcham = kNcham;
105 const Int_t AliTRDgeometry::fgkNdet = kNdet;
108 // Dimensions of the detector
110 const Float_t AliTRDgeometry::fgkRmin = 294.0;
111 const Float_t AliTRDgeometry::fgkRmax = 368.0;
113 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
114 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
116 const Float_t AliTRDgeometry::fgkSheight = 74.0;
117 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
118 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
119 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
120 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
121 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
123 const Float_t AliTRDgeometry::fgkCheight = 11.0;
124 const Float_t AliTRDgeometry::fgkCspace = 1.6;
125 const Float_t AliTRDgeometry::fgkCathick = 1.0;
126 const Float_t AliTRDgeometry::fgkCcthick = 1.0;
127 const Float_t AliTRDgeometry::fgkCaframe = 2.675;
128 const Float_t AliTRDgeometry::fgkCcframe = AliTRDgeometry::fgkCheight
129 - AliTRDgeometry::fgkCaframe;
132 // Thickness of the the material layers
134 const Float_t AliTRDgeometry::fgkSeThick = 0.02;
135 const Float_t AliTRDgeometry::fgkRaThick = 4.78;
136 const Float_t AliTRDgeometry::fgkPeThick = 0.20;
137 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
138 const Float_t AliTRDgeometry::fgkXeThick = 3.5;
139 const Float_t AliTRDgeometry::fgkDrThick = 3.0;
140 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkXeThick
141 - AliTRDgeometry::fgkDrThick;
142 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
143 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
144 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
145 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
146 const Float_t AliTRDgeometry::fgkWaThick = 0.01;
149 // Position of the material layers
151 const Float_t AliTRDgeometry::fgkSeZpos = -4.14;
152 const Float_t AliTRDgeometry::fgkRaZpos = -1.74;
153 const Float_t AliTRDgeometry::fgkPeZpos = 0.0000;
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;
163 //_____________________________________________________________________________
164 AliTRDgeometry::AliTRDgeometry():AliGeometry()
167 // AliTRDgeometry default constructor
174 //_____________________________________________________________________________
175 AliTRDgeometry::~AliTRDgeometry()
178 // AliTRDgeometry destructor
183 //_____________________________________________________________________________
184 void AliTRDgeometry::Init()
187 // Initializes the geometry parameter
192 // The width of the chambers
200 // The maximum number of pads
201 // and the position of pad 0,0,0
203 // chambers seen from the top:
204 // +----------------------------+
210 // +----------------------------+ +------>
212 // chambers seen from the side: ^
213 // +----------------------------+ drift|
216 // +----------------------------+ +------>
219 // IMPORTANT: time bin 0 is now the first one in the drift region
220 // closest to the readout !!!
223 // The pad column (rphi-direction)
226 // The number of time bins. Default is 100 ns timbin size
229 // Additional time bins before and after the drift region.
230 // Default is to only sample the drift region
231 SetExpandTimeBin(0,0);
233 // The rotation matrix elements
235 for (isect = 0; isect < fgkNsect; isect++) {
236 phi = -2.0 * kPI / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
237 fRotA11[isect] = TMath::Cos(phi);
238 fRotA12[isect] = TMath::Sin(phi);
239 fRotA21[isect] = TMath::Sin(phi);
240 fRotA22[isect] = TMath::Cos(phi);
242 fRotB11[isect] = TMath::Cos(phi);
243 fRotB12[isect] = TMath::Sin(phi);
244 fRotB21[isect] = TMath::Sin(phi);
245 fRotB22[isect] = TMath::Cos(phi);
250 //_____________________________________________________________________________
251 void AliTRDgeometry::SetNColPad(const Int_t npad)
254 // Redefines the number of pads in column direction
257 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
258 fColMax[iplan] = npad;
259 fColPadSize[iplan] = (fCwidth[iplan] - 2. * fgkCcthick) / fColMax[iplan];
260 fCol0[iplan] = -fCwidth[iplan]/2. + fgkCcthick;
265 //_____________________________________________________________________________
266 void AliTRDgeometry::SetNTimeBin(const Int_t nbin)
269 // Redefines the number of time bins in the drift region.
270 // The time bin width is defined by the length of the
271 // drift region divided by <nbin>.
275 fTimeBinSize = fgkDrThick / ((Float_t) fTimeMax);
276 for (Int_t iplan = 0; iplan < fgkNplan; iplan++) {
277 fTime0[iplan] = fgkRmin + fgkCcframe/2. + fgkDrZpos + 0.5 * fgkDrThick
278 + iplan * (fgkCheight + fgkCspace);
283 //_____________________________________________________________________________
284 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
287 // Create the TRD geometry
289 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
292 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
293 // To be placed into the spaceframe.
295 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
296 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
297 // (driftchamber + radiator)
298 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
299 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
300 // inner(/middle/outer) chambers
302 // The material layers in one chamber:
303 // UL01 (G10) --- The gas seal of the radiator
304 // UL02 (CO2) --- The gas in the radiator
305 // UL03 (PE) --- The foil stack
306 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
307 // UL05 (Xe) --- The driftvolume
308 // UL06 (Xe) --- The amplification region
310 // UL07 (Cu) --- The pad plane
311 // UL08 (G10) --- The Nomex honeycomb support structure
312 // UL09 (Cu) --- FEE and signal lines
313 // UL10 (PE) --- The cooling devices
314 // UL11 (Water) --- The cooling water
316 const Int_t kNparCha = 3;
319 Float_t parCha[kNparCha];
321 Float_t xpos, ypos, zpos;
323 // The aluminum frames - readout + electronics (Al)
324 // The inner chambers
325 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
326 // The middle chambers
327 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
328 // The outer chambers
329 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
331 // The inner part of the aluminum frames (Air)
332 // The inner chambers
333 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
334 // The middle chambers
335 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
336 // The outer chambers
337 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
339 // The carbon frames - radiator + driftchamber (C)
340 // The inner chambers
341 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
342 // The middle chambers
343 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
344 // The outer chambers
345 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
347 // The inner part of the carbon frames (Air)
348 // The inner chambers
349 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
350 // The middle chambers
351 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
352 // The outer chambers
353 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
355 // The material layers inside the chambers
358 // G10 layer (radiator seal)
359 parCha[2] = fgkSeThick/2;
360 gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],parCha,kNparCha);
361 // CO2 layer (radiator)
362 parCha[2] = fgkRaThick/2;
363 gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],parCha,kNparCha);
364 // PE layer (radiator)
365 parCha[2] = fgkPeThick/2;
366 gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],parCha,kNparCha);
367 // Mylar layer (entrance window + HV cathode)
368 parCha[2] = fgkMyThick/2;
369 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
370 // Xe/Isobutane layer (drift volume, sensitive)
371 parCha[2] = fgkDrThick/2.;
372 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
373 // Xe/Isobutane layer (amplification volume, not sensitive)
374 parCha[2] = fgkAmThick/2.;
375 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
377 // Cu layer (pad plane)
378 parCha[2] = fgkCuThick/2;
379 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
380 // G10 layer (support structure)
381 parCha[2] = fgkSuThick/2;
382 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
383 // Cu layer (FEE + signal lines)
384 parCha[2] = fgkFeThick/2;
385 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
386 // PE layer (cooling devices)
387 parCha[2] = fgkCoThick/2;
388 gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],parCha,kNparCha);
389 // Water layer (cooling)
390 parCha[2] = fgkWaThick/2;
391 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
393 // Position the layers in the chambers
397 // G10 layer (radiator seal)
399 gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY");
400 gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
401 gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
402 // CO2 layer (radiator)
404 gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY");
405 gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
406 gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
407 // PE layer (radiator)
409 gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY");
410 // Mylar layer (entrance window + HV cathode)
412 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
413 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
414 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
415 // Xe/Isobutane layer (drift volume)
417 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
418 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
419 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
420 // Xe/Isobutane layer (amplification volume)
422 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
423 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
424 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
426 // Cu layer (pad plane)
428 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
429 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
430 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
431 // G10 layer (support structure)
433 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
434 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
435 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
436 // Cu layer (FEE + signal lines)
438 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
439 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
440 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
441 // PE layer (cooling devices)
443 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
444 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
445 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
446 // Water layer (cooling)
448 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
449 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
450 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
454 //_____________________________________________________________________________
455 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global) const
458 // Converts local pad-coordinates (row,col,time) into
459 // global ALICE reference frame coordinates (x,y,z)
462 Int_t icham = GetChamber(idet); // Chamber info (0-4)
463 Int_t isect = GetSector(idet); // Sector info (0-17)
464 Int_t iplan = GetPlane(idet); // Plane info (0-5)
466 return Local2Global(iplan,icham,isect,local,global);
470 //_____________________________________________________________________________
471 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
472 , Float_t *local, Float_t *global) const
475 // Converts local pad-coordinates (row,col,time) into
476 // global ALICE reference frame coordinates (x,y,z)
479 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
481 Float_t padRow = local[0]; // Pad Row position
482 Float_t padCol = local[1]; // Pad Column position
483 Float_t timeSlice = local[2]; // Time "position"
485 Float_t row0 = GetRow0(iplan,icham,isect);
486 Float_t col0 = GetCol0(iplan);
487 Float_t time0 = GetTime0(iplan);
491 // calculate (x,y,z) position in rotated chamber
492 rot[0] = time0 - (timeSlice - fTimeBefore) * fTimeBinSize;
493 rot[1] = col0 + padCol * fColPadSize[iplan];
494 rot[2] = row0 + padRow * fRowPadSize[iplan][icham][isect];
496 // Rotate back to original position
497 return RotateBack(idet,rot,global);
501 //_____________________________________________________________________________
502 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
505 // Rotates all chambers in the position of sector 0 and transforms
506 // the coordinates in the ALICE restframe <pos> into the
507 // corresponding local frame <rot>.
510 Int_t sector = GetSector(d);
512 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
513 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
520 //_____________________________________________________________________________
521 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
524 // Rotates a chambers from the position of sector 0 into its
525 // original position and transforms the corresponding local frame
526 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
529 Int_t sector = GetSector(d);
531 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
532 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
539 //_____________________________________________________________________________
540 Int_t AliTRDgeometry::GetDetector(const Int_t p, const Int_t c, const Int_t s) const
543 // Convert plane / chamber / sector into detector number
546 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
550 //_____________________________________________________________________________
551 Int_t AliTRDgeometry::GetPlane(const Int_t d) const
554 // Reconstruct the plane number from the detector number
557 return ((Int_t) (d % fgkNplan));
561 //_____________________________________________________________________________
562 Int_t AliTRDgeometry::GetChamber(const Int_t d) const
565 // Reconstruct the chamber number from the detector number
568 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
572 //_____________________________________________________________________________
573 Int_t AliTRDgeometry::GetSector(const Int_t d) const
576 // Reconstruct the sector number from the detector number
579 return ((Int_t) (d / (fgkNplan * fgkNcham)));
583 //_____________________________________________________________________________
584 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos
585 , TMatrix &mat) const
588 // Returns the global coordinate and error matrix of a AliTRDrecPoint
596 //_____________________________________________________________________________
597 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos) const
600 // Returns the global coordinate and error matrix of a AliTRDrecPoint
603 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
607 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
608 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
609 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
611 if (Local2Global(detector,local,global)) {