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 "AliTRDpadPlane.h"
33 #include "AliTRDcalibDB.h"
34 #include "AliTRDCommonParam.h"
36 ClassImp(AliTRDgeometry)
38 //_____________________________________________________________________________
41 // The geometry constants
43 const Int_t AliTRDgeometry::fgkNsect = kNsect;
44 const Int_t AliTRDgeometry::fgkNplan = kNplan;
45 const Int_t AliTRDgeometry::fgkNcham = kNcham;
46 const Int_t AliTRDgeometry::fgkNdet = kNdet;
49 // Dimensions of the detector
52 // Inner and outer radius of the mother volumes
53 const Float_t AliTRDgeometry::fgkRmin = 294.0;
54 const Float_t AliTRDgeometry::fgkRmax = 368.0;
56 // Upper and lower length of the mother volumes
57 const Float_t AliTRDgeometry::fgkZmax1 = 378.35;
58 const Float_t AliTRDgeometry::fgkZmax2 = 302.0;
60 // Parameter of the BTR mother volumes
61 const Float_t AliTRDgeometry::fgkSheight = 74.0;
62 const Float_t AliTRDgeometry::fgkSwidth1 = 99.613;
63 const Float_t AliTRDgeometry::fgkSwidth2 = 125.707;
64 const Float_t AliTRDgeometry::fgkSlenTR1 = 751.0;
65 const Float_t AliTRDgeometry::fgkSlenTR2 = 313.5;
66 const Float_t AliTRDgeometry::fgkSlenTR3 = 159.5;
68 // The super module side plates
69 const Float_t AliTRDgeometry::fgkSMpltT = 0.2;
70 const Float_t AliTRDgeometry::fgkSMgapT = 0.5;
72 // Height of different chamber parts
74 const Float_t AliTRDgeometry::fgkCraH = 4.8;
76 const Float_t AliTRDgeometry::fgkCdrH = 3.0;
77 // Amplification region
78 const Float_t AliTRDgeometry::fgkCamH = 0.7;
80 const Float_t AliTRDgeometry::fgkCroH = 2.316;
82 const Float_t AliTRDgeometry::fgkCH = AliTRDgeometry::fgkCraH
83 + AliTRDgeometry::fgkCdrH
84 + AliTRDgeometry::fgkCamH
85 + AliTRDgeometry::fgkCroH;
87 // Vertical spacing of the chambers
88 const Float_t AliTRDgeometry::fgkVspace = 1.784;
90 // Horizontal spacing of the chambers
91 const Float_t AliTRDgeometry::fgkHspace = 2.0;
93 // Thicknesses of different parts of the chamber frame
94 // Lower aluminum frame
95 const Float_t AliTRDgeometry::fgkCalT = 0.3;
96 // Lower G10 frame sides
97 const Float_t AliTRDgeometry::fgkCclsT = 0.3;
98 // Lower G10 frame front
99 const Float_t AliTRDgeometry::fgkCclfT = 1.0;
101 const Float_t AliTRDgeometry::fgkCcuT = 0.9;
103 const Float_t AliTRDgeometry::fgkCauT = 1.5;
105 // Additional width of the readout chamber frames
106 const Float_t AliTRDgeometry::fgkCroW = 0.9;
108 // Difference of outer chamber width and pad plane width
109 //const Float_t AliTRDgeometry::fgkCpadW = 1.0;
110 const Float_t AliTRDgeometry::fgkCpadW = 0.0;
111 const Float_t AliTRDgeometry::fgkRpadW = 1.0;
114 // Thickness of the the material layers
116 const Float_t AliTRDgeometry::fgkRaThick = 0.3646;
117 const Float_t AliTRDgeometry::fgkMyThick = 0.005;
118 const Float_t AliTRDgeometry::fgkDrThick = AliTRDgeometry::fgkCdrH;
119 const Float_t AliTRDgeometry::fgkAmThick = AliTRDgeometry::fgkCamH;
120 const Float_t AliTRDgeometry::fgkXeThick = AliTRDgeometry::fgkDrThick
121 + AliTRDgeometry::fgkAmThick;
122 const Float_t AliTRDgeometry::fgkCuThick = 0.001;
123 const Float_t AliTRDgeometry::fgkSuThick = 0.06;
124 const Float_t AliTRDgeometry::fgkFeThick = 0.0044;
125 const Float_t AliTRDgeometry::fgkCoThick = 0.02;
126 const Float_t AliTRDgeometry::fgkWaThick = 0.02;
129 // Position of the material layers
131 const Float_t AliTRDgeometry::fgkRaZpos = -1.50;
132 const Float_t AliTRDgeometry::fgkMyZpos = 0.895;
133 const Float_t AliTRDgeometry::fgkDrZpos = 2.4;
134 const Float_t AliTRDgeometry::fgkAmZpos = 0.0;
135 const Float_t AliTRDgeometry::fgkCuZpos = -0.9995;
136 const Float_t AliTRDgeometry::fgkSuZpos = 0.0000;
137 const Float_t AliTRDgeometry::fgkFeZpos = 0.0322;
138 const Float_t AliTRDgeometry::fgkCoZpos = 0.97;
139 const Float_t AliTRDgeometry::fgkWaZpos = 0.99;
141 const Double_t AliTRDgeometry::fgkTime0Base = Rmin() + CraHght() + CdrHght() + CamHght()/2.;
142 const Float_t AliTRDgeometry::fgkTime0[6] = { fgkTime0Base + 0 * (Cheight() + Cspace()),
143 fgkTime0Base + 1 * (Cheight() + Cspace()),
144 fgkTime0Base + 2 * (Cheight() + Cspace()),
145 fgkTime0Base + 3 * (Cheight() + Cspace()),
146 fgkTime0Base + 4 * (Cheight() + Cspace()),
147 fgkTime0Base + 5 * (Cheight() + Cspace()) };
149 //_____________________________________________________________________________
150 AliTRDgeometry::AliTRDgeometry():AliGeometry()
153 // AliTRDgeometry default constructor
159 //_____________________________________________________________________________
160 AliTRDgeometry::~AliTRDgeometry()
163 // AliTRDgeometry destructor
167 //_____________________________________________________________________________
168 void AliTRDgeometry::Init()
171 // Initializes the geometry parameter
173 // The maximum number of pads
174 // and the position of pad 0,0,0
176 // chambers seen from the top:
177 // +----------------------------+
183 // +----------------------------+ +------>
185 // chambers seen from the side: ^
186 // +----------------------------+ drift|
189 // +----------------------------+ +------>
192 // IMPORTANT: time bin 0 is now the first one in the drift region
193 // closest to the readout !!!
200 // The outer width of the chambers
202 // Changed with the introduction of
203 // the new layer 0. The old layer 6
212 // fCwidth[5] = 117.0;
214 // The outer lengths of the chambers
215 // Includes the spacings between the chambers!
216 // Changed with the introduction of
217 // the new layer 0. The old layer 6
219 Float_t length[kNplan][kNcham] = { { 124.0, 124.0, 110.0, 124.0, 124.0 }
220 , { 124.0, 124.0, 110.0, 124.0, 124.0 }
221 , { 131.0, 131.0, 110.0, 131.0, 131.0 }
222 , { 138.0, 138.0, 110.0, 138.0, 138.0 }
223 , { 145.0, 145.0, 110.0, 145.0, 145.0 }
224 , { 147.0, 147.0, 110.0, 147.0, 147.0 } };
226 // , { 147.0, 147.0, 110.0, 147.0, 147.0 } };
228 for (icham = 0; icham < kNcham; icham++) {
229 for (iplan = 0; iplan < kNplan; iplan++) {
230 fClength[iplan][icham] = length[iplan][icham];
231 fClengthPH[iplan][icham] = 0.0;
232 fClengthRH[iplan][icham] = 0.0;
236 // The rotation matrix elements
238 for (isect = 0; isect < fgkNsect; isect++) {
239 phi = -2.0 * TMath::Pi() / (Float_t) fgkNsect * ((Float_t) isect + 0.5);
240 fRotA11[isect] = TMath::Cos(phi);
241 fRotA12[isect] = TMath::Sin(phi);
242 fRotA21[isect] = TMath::Sin(phi);
243 fRotA22[isect] = TMath::Cos(phi);
245 fRotB11[isect] = TMath::Cos(phi);
246 fRotB12[isect] = TMath::Sin(phi);
247 fRotB21[isect] = TMath::Sin(phi);
248 fRotB22[isect] = TMath::Cos(phi);
253 //_____________________________________________________________________________
254 void AliTRDgeometry::CreateGeometry(Int_t* )
257 // Create TRD geometry
262 //_____________________________________________________________________________
263 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Double_t *local
264 , Double_t *global) const
267 // Converts local pad-coordinates (row,col,time) into
268 // global ALICE reference frame coordinates (x,y,z)
271 Int_t icham = GetChamber(idet); // Chamber info (0-4)
272 Int_t isect = GetSector(idet); // Sector info (0-17)
273 Int_t iplan = GetPlane(idet); // Plane info (0-5)
275 return Local2Global(iplan,icham,isect,local,global);
279 //_____________________________________________________________________________
280 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
281 , Double_t *local, Double_t *global) const
284 // Converts local pad-coordinates (row,col,time) into
285 // global ALICE reference frame coordinates (x,y,z)
288 AliTRDCommonParam* commonParam = AliTRDCommonParam::Instance();
292 AliTRDcalibDB* calibration = AliTRDcalibDB::Instance();
296 AliTRDpadPlane *padPlane = commonParam->GetPadPlane(iplan,icham);
298 // calculate (x,y,z) position in rotated chamber
299 Int_t row = ((Int_t) local[0]);
300 Int_t col = ((Int_t) local[1]);
301 Float_t timeSlice = local[2] + 0.5;
302 Float_t time0 = GetTime0(iplan);
304 Int_t idet = GetDetector(iplan, icham, isect);
307 rot[0] = time0 - (timeSlice - calibration->GetT0(idet, col, row))
308 * calibration->GetVdrift(idet, col, row)/calibration->GetSamplingFrequency();
309 rot[1] = padPlane->GetColPos(col) - 0.5 * padPlane->GetColSize(col);
310 rot[2] = padPlane->GetRowPos(row) - 0.5 * padPlane->GetRowSize(row);
312 // Rotate back to original position
313 return RotateBack(idet,rot,global);
317 //_____________________________________________________________________________
318 Bool_t AliTRDgeometry::Global2Local(Int_t mode, Double_t *local, Double_t *global
319 , Int_t* index) const
322 // Converts local pad-coordinates (row,col,time) into
323 // global ALICE reference frame coordinates (x,y,z)
325 // index[0] = plane number
326 // index[1] = chamber number
327 // index[2] = sector number
329 // mode=0 - local coordinate in y, z, x - rotated global
330 // mode=2 - local coordinate in pad, and pad row, x - rotated global
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 = 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(Double_t global[3], Int_t index[3])
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 - GetTime0(0);
377 for (Int_t iplane=1; iplane<fgkNplan;iplane++){
378 Float_t dist = TMath::Abs(locx - 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, Double_t *pos, Double_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, Double_t *rot, Double_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)
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)
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");