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 ///////////////////////////////////////////////////////////////////////////////
20 // TRD geometry class //
22 ///////////////////////////////////////////////////////////////////////////////
25 #include "AliTRDgeometry.h"
26 #include "AliTRDparameter.h"
28 ClassImp(AliTRDgeometry)
30 //_____________________________________________________________________________
33 // The geometry constants
35 const Int_t AliTRDgeometry::fgkNsect = kNsect;
36 const Int_t AliTRDgeometry::fgkNplan = kNplan;
37 const Int_t AliTRDgeometry::fgkNcham = kNcham;
38 const Int_t AliTRDgeometry::fgkNdet = kNdet;
41 // Dimensions of the detector
44 // Inner and outer radius of the mother volumes
45 const Float_t AliTRDgeometry::fgkRmin = 294.0;
46 const Float_t AliTRDgeometry::fgkRmax = 368.0;
48 // Upper and lower length of the mother volumes
49 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
50 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
52 // Parameter of the BTR mother volumes
53 const Float_t AliTRDgeometry::fgkSheight = 74.0;
54 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
55 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
56 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
57 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
58 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
60 // The super module side plates
61 const Float_t AliTRDgeometry::fgkSMpltT = 0.2;
62 const Float_t AliTRDgeometry::fgkSMgapT = 0.5;
64 // Height of different chamber parts
66 const Float_t AliTRDgeometry::fgkCraH = 4.8;
68 const Float_t AliTRDgeometry::fgkCdrH = 3.0;
69 // Amplification region
70 const Float_t AliTRDgeometry::fgkCamH = 0.7;
72 const Float_t AliTRDgeometry::fgkCroH = 2.316;
74 const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
75 + AliTRDgeometry::fgkCdrH
76 + AliTRDgeometry::fgkCamH
77 + AliTRDgeometry::fgkCroH;
79 // Vertical spacing of the chambers
80 const Float_t AliTRDgeometry::fgkVspace = 1.784;
82 // Horizontal spacing of the chambers
83 const Float_t AliTRDgeometry::fgkHspace = 2.0;
85 // Thicknesses of different parts of the chamber frame
86 // Lower aluminum frame
87 const Float_t AliTRDgeometry::fgkCalT = 0.3;
88 // Lower G10 frame sides
89 const Float_t AliTRDgeometry::fgkCclsT = 0.3;
90 // Lower G10 frame front
91 const Float_t AliTRDgeometry::fgkCclfT = 1.0;
93 const Float_t AliTRDgeometry::fgkCcuT = 0.9;
95 const Float_t AliTRDgeometry::fgkCauT = 1.5;
97 // Additional width of the readout chamber frames
98 const Float_t AliTRDgeometry::fgkCroW = 0.9;
100 // Difference of outer chamber width and pad plane width
101 //const Float_t AliTRDgeometry::fgkCpadW = 1.0;
102 const Float_t AliTRDgeometry::fgkCpadW = 0.0;
103 const Float_t AliTRDgeometry::fgkRpadW = 1.0;
106 // Thickness of the the material layers
108 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
109 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
110 const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
111 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
112 const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
113 + AliTRDgeometry::fgkAmThick;
114 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
115 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
116 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
117 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
118 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
121 // Position of the material layers
123 const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
124 const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
125 const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
126 const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
127 const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
128 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
129 const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
130 const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
131 const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
133 //_____________________________________________________________________________
134 AliTRDgeometry::AliTRDgeometry():AliGeometry()
137 // AliTRDgeometry default constructor
144 //_____________________________________________________________________________
145 AliTRDgeometry::~AliTRDgeometry()
148 // AliTRDgeometry destructor
153 //_____________________________________________________________________________
154 void AliTRDgeometry::Init()
157 // Initializes the geometry parameter
159 // The maximum number of pads
160 // and the position of pad 0,0,0
162 // chambers seen from the top:
163 // +----------------------------+
169 // +----------------------------+ +------>
171 // chambers seen from the side: ^
172 // +----------------------------+ drift|
175 // +----------------------------+ +------>
178 // IMPORTANT: time bin 0 is now the first one in the drift region
179 // closest to the readout !!!
186 // The outer width of the chambers
194 // The outer lengths of the chambers
195 // Includes the spacings between the chambers!
196 Float_t length[kNplan][kNcham] = { { 124.0, 124.0, 110.0, 124.0, 124.0 }
197 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
198 , { 138.0, 138.0, 110.0, 138.0, 138.0 }
199 , { 145.0, 145.0, 110.0, 145.0, 145.0 }
200 , { 147.0, 147.0, 110.0, 147.0, 147.0 }
201 , { 147.0, 147.0, 110.0, 147.0, 147.0 } };
203 for (icham = 0; icham < kNcham; icham++) {
204 for (iplan = 0; iplan < kNplan; iplan++) {
205 fClength[iplan][icham] = length[iplan][icham];
206 fClengthPH[iplan][icham] = 0.0;
207 fClengthRH[iplan][icham] = 0.0;
211 // The rotation matrix elements
213 for (isect = 0; isect < fgkNsect; isect++) {
214 phi = -2.0 * TMath::Pi() / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
215 fRotA11[isect] = TMath::Cos(phi);
216 fRotA12[isect] = TMath::Sin(phi);
217 fRotA21[isect] = TMath::Sin(phi);
218 fRotA22[isect] = TMath::Cos(phi);
220 fRotB11[isect] = TMath::Cos(phi);
221 fRotB12[isect] = TMath::Sin(phi);
222 fRotB21[isect] = TMath::Sin(phi);
223 fRotB22[isect] = TMath::Cos(phi);
228 //_____________________________________________________________________________
229 void AliTRDgeometry::CreateGeometry(Int_t* )
232 // Create TRD geometry
237 //_____________________________________________________________________________
238 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local
240 , AliTRDparameter *par) const
243 // Converts local pad-coordinates (row,col,time) into
244 // global ALICE reference frame coordinates (x,y,z)
247 Int_t icham = GetChamber(idet); // Chamber info (0-4)
248 Int_t isect = GetSector(idet); // Sector info (0-17)
249 Int_t iplan = GetPlane(idet); // Plane info (0-5)
251 return Local2Global(iplan,icham,isect,local,global,par);
255 //_____________________________________________________________________________
256 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
257 , Float_t *local, Float_t *global
258 , AliTRDparameter *par) const
261 // Converts local pad-coordinates (row,col,time) into
262 // global ALICE reference frame coordinates (x,y,z)
266 Error("Local2Global","No parameter defined\n");
270 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
272 Float_t padRow = local[0]+0.5; // Pad Row position
273 Float_t padCol = local[1]+0.5; // Pad Column position
274 Float_t timeSlice = local[2]+0.5; // Time "position"
276 Float_t row0 = par->GetRow0(iplan,icham,isect);
277 Float_t col0 = par->GetCol0(iplan);
278 Float_t time0 = par->GetTime0(iplan);
282 // calculate (x,y,z) position in rotated chamber
283 rot[0] = time0 - (timeSlice - par->GetTimeBefore())
284 * par->GetTimeBinSize();
285 rot[1] = col0 + padCol
286 * par->GetColPadSize(iplan);
287 rot[2] = row0 + padRow
288 * par->GetRowPadSize(iplan,icham,isect);
290 // Rotate back to original position
291 return RotateBack(idet,rot,global);
297 //_____________________________________________________________________________
298 Bool_t AliTRDgeometry::Global2Local(Int_t mode, Float_t *local, Float_t *global, Int_t* index, AliTRDparameter *par) const
301 // Converts local pad-coordinates (row,col,time) into
302 // global ALICE reference frame coordinates (x,y,z)
304 //index[0]=plane number
305 //index[1]=chamber number
306 //index[2]=sector number
308 // mode=0 - local coordinate in y, z, x - rotated global
309 // mode=2 - local coordinate in pad, and pad row, x - rotated global
312 Error("Local2Global","No parameter defined\n");
316 //Int_t idet = GetDetector(iplan,icham,isect); // Detector number
317 Int_t idet = GetDetector(index[0],index[1],index[2]); // Detector number
318 Rotate(idet,global,local);
319 if (mode==0) return kTRUE;
321 // Float_t row0 = par->GetRow0(iplan,icham,isect);
322 //Float_t col0 = par->GetCol0(iplan);
323 //Float_t time0 = par->GetTime0(iplan);
325 // mode 1 to be implemented later
326 // calculate (x,y,z) position in time bin pad row pad
328 //rot[0] = time0 - (timeSlice - par->GetTimeBefore())
329 // * par->GetTimeBinSize();
330 //rot[1] = col0 + padCol
331 // * par->GetColPadSize(iplan);
332 //rot[2] = row0 + padRow
333 // * par->GetRowPadSize(iplan,icham,isect);
339 //___________________________________________________________________
340 Bool_t AliTRDgeometry::Global2Detector(Float_t global[3], Int_t index[3], AliTRDparameter *par)
344 //input = global position
346 //index[0]=plane number
347 //index[1]=chamber number
348 //index[2]=sector number
351 fi = TMath::ATan2(global[1],global[0]);
352 if (fi<0) fi += 2*TMath::Pi();
353 index[2] = Int_t(TMath::Nint((fi - GetAlpha()/2.)/GetAlpha()));
356 Float_t locx = global[0] * fRotA11[index[2]] + global[1] * fRotA12[index[2]];
358 Float_t max = locx-par->GetTime0(0);
359 for (Int_t iplane=1; iplane<fgkNplan;iplane++){
360 Float_t dist = TMath::Abs(locx-par->GetTime0(iplane));
366 Float_t theta = TMath::ATan2(global[2],locx);
367 index[1] = TMath::Nint(float(fgkNcham)*theta/(0.25*TMath::Pi()));
373 //_____________________________________________________________________________
374 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
377 // Rotates all chambers in the position of sector 0 and transforms
378 // the coordinates in the ALICE restframe <pos> into the
379 // corresponding local frame <rot>.
382 Int_t sector = GetSector(d);
384 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
385 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
392 //_____________________________________________________________________________
393 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
396 // Rotates a chambers from the position of sector 0 into its
397 // original position and transforms the corresponding local frame
398 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
401 Int_t sector = GetSector(d);
403 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
404 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
411 //_____________________________________________________________________________
412 Int_t AliTRDgeometry::GetDetectorSec(Int_t p, Int_t c) const
415 // Convert plane / chamber into detector number for one single sector
418 return (p + c * fgkNplan);
422 //_____________________________________________________________________________
423 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
426 // Convert plane / chamber / sector into detector number
429 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
433 //_____________________________________________________________________________
434 Int_t AliTRDgeometry::GetPlane(Int_t d) const
437 // Reconstruct the plane number from the detector number
440 return ((Int_t) (d % fgkNplan));
444 //_____________________________________________________________________________
445 Int_t AliTRDgeometry::GetChamber(Int_t d) const
448 // Reconstruct the chamber number from the detector number
451 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
455 //_____________________________________________________________________________
456 Int_t AliTRDgeometry::GetSector(Int_t d) const
459 // Reconstruct the sector number from the detector number
462 return ((Int_t) (d / (fgkNplan * fgkNcham)));
466 //_____________________________________________________________________________
467 void AliTRDgeometry::SetOldGeometry()
470 // Use the old chamber lengths
476 Float_t length[kNplan][kNcham] = { { 123.5, 123.5, 110.0, 123.5, 123.5 }
477 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
478 , { 134.5, 138.5, 110.0, 138.5, 134.5 }
479 , { 142.0, 146.0, 110.0, 146.0, 142.0 }
480 , { 142.0, 153.0, 110.0, 153.0, 142.0 }
481 , { 134.0, 160.5, 110.0, 160.5, 134.0 } };
483 for (icham = 0; icham < kNcham; icham++) {
484 for (iplan = 0; iplan < kNplan; iplan++) {
485 fClength[iplan][icham] = length[iplan][icham];