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 ///////////////////////////////////////////////////////////////////////////////
27 #include "AliRunLoader.h"
28 #include "AliTRDgeometry.h"
29 #include "AliTRDparameter.h"
34 ClassImp(AliTRDgeometry)
36 //_____________________________________________________________________________
39 // The geometry constants
41 const Int_t AliTRDgeometry::fgkNsect = kNsect;
42 const Int_t AliTRDgeometry::fgkNplan = kNplan;
43 const Int_t AliTRDgeometry::fgkNcham = kNcham;
44 const Int_t AliTRDgeometry::fgkNdet = kNdet;
47 // Dimensions of the detector
50 // Inner and outer radius of the mother volumes
51 const Float_t AliTRDgeometry::fgkRmin = 294.0;
52 const Float_t AliTRDgeometry::fgkRmax = 368.0;
54 // Upper and lower length of the mother volumes
55 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
56 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
58 // Parameter of the BTR mother volumes
59 const Float_t AliTRDgeometry::fgkSheight = 74.0;
60 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
61 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
62 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
63 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
64 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
66 // The super module side plates
67 const Float_t AliTRDgeometry::fgkSMpltT = 0.2;
68 const Float_t AliTRDgeometry::fgkSMgapT = 0.5;
70 // Height of different chamber parts
72 const Float_t AliTRDgeometry::fgkCraH = 4.8;
74 const Float_t AliTRDgeometry::fgkCdrH = 3.0;
75 // Amplification region
76 const Float_t AliTRDgeometry::fgkCamH = 0.7;
78 const Float_t AliTRDgeometry::fgkCroH = 2.316;
80 const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
81 + AliTRDgeometry::fgkCdrH
82 + AliTRDgeometry::fgkCamH
83 + AliTRDgeometry::fgkCroH;
85 // Vertical spacing of the chambers
86 const Float_t AliTRDgeometry::fgkVspace = 1.784;
88 // Horizontal spacing of the chambers
89 const Float_t AliTRDgeometry::fgkHspace = 2.0;
91 // Thicknesses of different parts of the chamber frame
92 // Lower aluminum frame
93 const Float_t AliTRDgeometry::fgkCalT = 0.3;
94 // Lower G10 frame sides
95 const Float_t AliTRDgeometry::fgkCclsT = 0.3;
96 // Lower G10 frame front
97 const Float_t AliTRDgeometry::fgkCclfT = 1.0;
99 const Float_t AliTRDgeometry::fgkCcuT = 0.9;
101 const Float_t AliTRDgeometry::fgkCauT = 1.5;
103 // Additional width of the readout chamber frames
104 const Float_t AliTRDgeometry::fgkCroW = 0.9;
106 // Difference of outer chamber width and pad plane width
107 //const Float_t AliTRDgeometry::fgkCpadW = 1.0;
108 const Float_t AliTRDgeometry::fgkCpadW = 0.0;
109 const Float_t AliTRDgeometry::fgkRpadW = 1.0;
112 // Thickness of the the material layers
114 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
115 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
116 const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
117 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
118 const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
119 + AliTRDgeometry::fgkAmThick;
120 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
121 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
122 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
123 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
124 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
127 // Position of the material layers
129 const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
130 const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
131 const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
132 const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
133 const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
134 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
135 const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
136 const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
137 const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
139 //_____________________________________________________________________________
140 AliTRDgeometry::AliTRDgeometry():AliGeometry()
143 // AliTRDgeometry default constructor
150 //_____________________________________________________________________________
151 AliTRDgeometry::~AliTRDgeometry()
154 // AliTRDgeometry destructor
159 //_____________________________________________________________________________
160 void AliTRDgeometry::Init()
163 // Initializes the geometry parameter
165 // The maximum number of pads
166 // and the position of pad 0,0,0
168 // chambers seen from the top:
169 // +----------------------------+
175 // +----------------------------+ +------>
177 // chambers seen from the side: ^
178 // +----------------------------+ drift|
181 // +----------------------------+ +------>
184 // IMPORTANT: time bin 0 is now the first one in the drift region
185 // closest to the readout !!!
192 // The outer width of the chambers
194 // Changed with the introduction of
195 // the new layer 0. The old layer 6
204 // fCwidth[5] = 117.0;
206 // The outer lengths of the chambers
207 // Includes the spacings between the chambers!
208 // Changed with the introduction of
209 // the new layer 0. The old layer 6
211 Float_t length[kNplan][kNcham] = { { 124.0, 124.0, 110.0, 124.0, 124.0 }
212 , { 124.0, 124.0, 110.0, 124.0, 124.0 }
213 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
214 , { 138.0, 138.0, 110.0, 138.0, 138.0 }
215 , { 145.0, 145.0, 110.0, 145.0, 145.0 }
216 , { 147.0, 147.0, 110.0, 147.0, 147.0 } };
218 // , { 147.0, 147.0, 110.0, 147.0, 147.0 } };
220 for (icham = 0; icham < kNcham; icham++) {
221 for (iplan = 0; iplan < kNplan; iplan++) {
222 fClength[iplan][icham] = length[iplan][icham];
223 fClengthPH[iplan][icham] = 0.0;
224 fClengthRH[iplan][icham] = 0.0;
228 // The rotation matrix elements
230 for (isect = 0; isect < fgkNsect; isect++) {
231 phi = -2.0 * TMath::Pi() / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
232 fRotA11[isect] = TMath::Cos(phi);
233 fRotA12[isect] = TMath::Sin(phi);
234 fRotA21[isect] = TMath::Sin(phi);
235 fRotA22[isect] = TMath::Cos(phi);
237 fRotB11[isect] = TMath::Cos(phi);
238 fRotB12[isect] = TMath::Sin(phi);
239 fRotB21[isect] = TMath::Sin(phi);
240 fRotB22[isect] = TMath::Cos(phi);
245 //_____________________________________________________________________________
246 void AliTRDgeometry::CreateGeometry(Int_t* )
249 // Create TRD geometry
254 //_____________________________________________________________________________
255 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local
257 , AliTRDparameter *par) const
260 // Converts local pad-coordinates (row,col,time) into
261 // global ALICE reference frame coordinates (x,y,z)
264 Int_t icham = GetChamber(idet); // Chamber info (0-4)
265 Int_t isect = GetSector(idet); // Sector info (0-17)
266 Int_t iplan = GetPlane(idet); // Plane info (0-5)
268 return Local2Global(iplan,icham,isect,local,global,par);
272 //_____________________________________________________________________________
273 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
274 , Float_t *local, Float_t *global
275 , AliTRDparameter *par) const
278 // Converts local pad-coordinates (row,col,time) into
279 // global ALICE reference frame coordinates (x,y,z)
283 Error("Local2Global","No parameter defined\n");
287 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
289 Float_t padRow = local[0]+0.5; // Pad Row position
290 Float_t padCol = local[1]+0.5; // Pad Column position
291 Float_t timeSlice = local[2]+0.5; // Time "position"
293 Float_t row0 = par->GetRow0(iplan,icham,isect);
294 Float_t col0 = par->GetCol0(iplan);
295 Float_t time0 = par->GetTime0(iplan);
299 // calculate (x,y,z) position in rotated chamber
300 rot[0] = time0 - (timeSlice - par->GetTimeBefore())
301 * par->GetDriftVelocity()/par->GetSamplingFrequency();
302 rot[1] = col0 + padCol
303 * par->GetColPadSize(iplan);
304 rot[2] = row0 + padRow
305 * par->GetRowPadSize(iplan,icham,isect);
307 // Rotate back to original position
308 return RotateBack(idet,rot,global);
312 //_____________________________________________________________________________
313 Bool_t AliTRDgeometry::Global2Local(Int_t mode, Float_t *local, Float_t *global
314 , Int_t* index, AliTRDparameter *par) const
317 // Converts local pad-coordinates (row,col,time) into
318 // global ALICE reference frame coordinates (x,y,z)
320 // index[0] = plane number
321 // index[1] = chamber number
322 // index[2] = sector number
324 // mode=0 - local coordinate in y, z, x - rotated global
325 // mode=2 - local coordinate in pad, and pad row, x - rotated global
329 Error("Local2Global","No parameter defined\n");
333 //Int_t idet = GetDetector(iplan,icham,isect); // Detector number
334 Int_t idet = GetDetector(index[0],index[1],index[2]); // Detector number
335 Rotate(idet,global,local);
336 if (mode==0) return kTRUE;
338 // Float_t row0 = par->GetRow0(iplan,icham,isect);
339 //Float_t col0 = par->GetCol0(iplan);
340 //Float_t time0 = par->GetTime0(iplan);
342 // mode 1 to be implemented later
343 // calculate (x,y,z) position in time bin pad row pad
345 //rot[0] = time0 - (timeSlice - par->GetTimeBefore())
346 // * par->GetDriftVelocity()/par->GetSamplingFrequency();
347 //rot[1] = col0 + padCol
348 // * par->GetColPadSize(iplan);
349 //rot[2] = row0 + padRow
350 // * par->GetRowPadSize(iplan,icham,isect);
356 //___________________________________________________________________
357 Bool_t AliTRDgeometry::Global2Detector(Float_t global[3], Int_t index[3], AliTRDparameter *par)
360 // input = global position
362 // index[0] = plane number
363 // index[1] = chamber number
364 // index[2] = sector number
369 fi = TMath::ATan2(global[1],global[0]);
370 if (fi<0) fi += 2*TMath::Pi();
371 index[2] = Int_t(TMath::Nint((fi - GetAlpha()/2.)/GetAlpha()));
374 Float_t locx = global[0] * fRotA11[index[2]] + global[1] * fRotA12[index[2]];
376 Float_t max = locx-par->GetTime0(0);
377 for (Int_t iplane=1; iplane<fgkNplan;iplane++){
378 Float_t dist = TMath::Abs(locx-par->GetTime0(iplane));
384 Float_t theta = TMath::ATan2(global[2],locx);
385 index[1] = TMath::Nint(float(fgkNcham)*theta/(0.25*TMath::Pi()));
391 //_____________________________________________________________________________
392 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot) const
395 // Rotates all chambers in the position of sector 0 and transforms
396 // the coordinates in the ALICE restframe <pos> into the
397 // corresponding local frame <rot>.
400 Int_t sector = GetSector(d);
402 rot[0] = pos[0] * fRotA11[sector] + pos[1] * fRotA12[sector];
403 rot[1] = -pos[0] * fRotA21[sector] + pos[1] * fRotA22[sector];
410 //_____________________________________________________________________________
411 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos) const
414 // Rotates a chambers from the position of sector 0 into its
415 // original position and transforms the corresponding local frame
416 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
419 Int_t sector = GetSector(d);
421 pos[0] = rot[0] * fRotB11[sector] + rot[1] * fRotB12[sector];
422 pos[1] = -rot[0] * fRotB21[sector] + rot[1] * fRotB22[sector];
429 //_____________________________________________________________________________
430 Int_t AliTRDgeometry::GetDetectorSec(Int_t p, Int_t c) const
433 // Convert plane / chamber into detector number for one single sector
436 return (p + c * fgkNplan);
440 //_____________________________________________________________________________
441 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s) const
444 // Convert plane / chamber / sector into detector number
447 return (p + c * fgkNplan + s * fgkNplan * fgkNcham);
451 //_____________________________________________________________________________
452 Int_t AliTRDgeometry::GetPlane(Int_t d) const
455 // Reconstruct the plane number from the detector number
458 return ((Int_t) (d % fgkNplan));
462 //_____________________________________________________________________________
463 Int_t AliTRDgeometry::GetChamber(Int_t d) const
466 // Reconstruct the chamber number from the detector number
469 return ((Int_t) (d % (fgkNplan * fgkNcham)) / fgkNplan);
473 //_____________________________________________________________________________
474 Int_t AliTRDgeometry::GetSector(Int_t d) const
477 // Reconstruct the sector number from the detector number
480 return ((Int_t) (d / (fgkNplan * fgkNcham)));
484 //_____________________________________________________________________________
485 AliTRDgeometry* AliTRDgeometry::GetGeometry(AliRunLoader* runLoader)
488 // load the geometry from the galice file
491 if (!runLoader) runLoader = AliRunLoader::GetRunLoader();
493 ::Error("AliTRDgeometry::GetGeometry", "No run loader");
497 TDirectory* saveDir = gDirectory;
498 runLoader->CdGAFile();
500 // Try from the galice.root file
501 AliTRDgeometry* geom = (AliTRDgeometry*) gDirectory->Get("TRDgeometry");
504 // It is not in the file, try to get it from gAlice,
505 // which corresponds to the run loader
506 AliTRD * trd = (AliTRD*)runLoader->GetAliRun()->GetDetector("TRD");
507 geom = trd->GetGeometry();
509 if (!geom) ::Error("AliTRDgeometry::GetGeometry", "Geometry not found");