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 1.1.4.1 2000/05/08 14:45:55 cblume
19 Bug fix in RotateBack(). Geometry update
21 Revision 1.1 2000/02/28 19:00:44 cblume
26 ///////////////////////////////////////////////////////////////////////////////
28 // TRD geometry class //
30 ///////////////////////////////////////////////////////////////////////////////
32 #include "AliTRDgeometry.h"
33 #include "AliTRDrecPoint.h"
35 ClassImp(AliTRDgeometry)
37 //_____________________________________________________________________________
38 AliTRDgeometry::AliTRDgeometry():AliGeometry()
41 // AliTRDgeometry default constructor
48 //_____________________________________________________________________________
49 AliTRDgeometry::~AliTRDgeometry()
54 //_____________________________________________________________________________
55 void AliTRDgeometry::Init()
58 // Initializes the geometry parameter
63 // The width of the chambers
71 // The default pad dimensions
76 // The maximum number of pads
77 // and the position of pad 0,0,0
79 // chambers seen from the top:
80 // +----------------------------+
86 // +----------------------------+ +------>
88 // chambers seen from the side: ^
89 // +----------------------------+ time|
92 // +----------------------------+ +------>
96 // The pad column (rphi-direction)
97 for (iplan = 0; iplan < kNplan; iplan++) {
98 fColMax[iplan] = 1 + TMath::Nint((fCwidth[iplan] - 2. * kCcthick)
100 fCol0[iplan] = -fCwidth[iplan]/2. + kCcthick;
104 fTimeMax = 1 + TMath::Nint(kDrThick / fTimeBinSize - 0.5);
105 for (iplan = 0; iplan < kNplan; iplan++) {
106 fTime0[iplan] = kRmin + kCcframe/2. + kDrZpos - 0.5 * kDrThick
107 + iplan * (kCheight + kCspace);
112 //_____________________________________________________________________________
113 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
116 // Create the TRD geometry
118 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
121 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
122 // To be placed into the spaceframe.
124 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
125 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
126 // (driftchamber + radiator)
127 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
128 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
129 // inner(/middle/outer) chambers
131 // The material layers in one chamber:
132 // UL01 (G10) --- The gas seal of the radiator
133 // UL02 (CO2) --- The gas in the radiator
134 // UL03 (PE) --- The foil stack
135 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
136 // UL05 (Xe) --- The driftvolume
137 // UL06 (Xe) --- The amplification region
139 // UL07 (Cu) --- The pad plane
140 // UL08 (G10) --- The Nomex honeycomb support structure
141 // UL09 (Cu) --- FEE and signal lines
142 // UL10 (PE) --- The cooling devices
143 // UL11 (Water) --- The cooling water
145 const Int_t npar_cha = 3;
148 Float_t par_cha[npar_cha];
150 Float_t xpos, ypos, zpos;
152 // The aluminum frames - readout + electronics (Al)
153 // The inner chambers
154 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],par_dum,0);
155 // The middle chambers
156 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],par_dum,0);
157 // The outer chambers
158 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],par_dum,0);
160 // The inner part of the aluminum frames (Air)
161 // The inner chambers
162 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],par_dum,0);
163 // The middle chambers
164 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],par_dum,0);
165 // The outer chambers
166 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],par_dum,0);
168 // The carbon frames - radiator + driftchamber (C)
169 // The inner chambers
170 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],par_dum,0);
171 // The middle chambers
172 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],par_dum,0);
173 // The outer chambers
174 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],par_dum,0);
176 // The inner part of the carbon frames (Air)
177 // The inner chambers
178 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],par_dum,0);
179 // The middle chambers
180 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],par_dum,0);
181 // The outer chambers
182 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],par_dum,0);
184 // The material layers inside the chambers
187 // G10 layer (radiator seal)
188 par_cha[2] = kSeThick/2;
189 gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],par_cha,npar_cha);
190 // CO2 layer (radiator)
191 par_cha[2] = kRaThick/2;
192 gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],par_cha,npar_cha);
193 // PE layer (radiator)
194 par_cha[2] = kPeThick/2;
195 gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],par_cha,npar_cha);
196 // Mylar layer (entrance window + HV cathode)
197 par_cha[2] = kMyThick/2;
198 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],par_cha,npar_cha);
199 // Xe/Isobutane layer (drift volume, sensitive)
200 par_cha[2] = kDrThick/2.;
201 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],par_cha,npar_cha);
202 // Xe/Isobutane layer (amplification volume, not sensitive)
203 par_cha[2] = kAmThick/2.;
204 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],par_cha,npar_cha);
206 // Cu layer (pad plane)
207 par_cha[2] = kCuThick/2;
208 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],par_cha,npar_cha);
209 // G10 layer (support structure)
210 par_cha[2] = kSuThick/2;
211 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],par_cha,npar_cha);
212 // Cu layer (FEE + signal lines)
213 par_cha[2] = kFeThick/2;
214 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],par_cha,npar_cha);
215 // PE layer (cooling devices)
216 par_cha[2] = kCoThick/2;
217 gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],par_cha,npar_cha);
218 // Water layer (cooling)
219 par_cha[2] = kWaThick/2;
220 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],par_cha,npar_cha);
222 // Position the layers in the chambers
226 // G10 layer (radiator seal)
228 gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY");
229 gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
230 gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
231 // CO2 layer (radiator)
233 gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY");
234 gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
235 gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
236 // PE layer (radiator)
238 gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY");
239 // Mylar layer (entrance window + HV cathode)
241 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
242 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
243 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
244 // Xe/Isobutane layer (drift volume)
246 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
247 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
248 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
249 // Xe/Isobutane layer (amplification volume)
251 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
252 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
253 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
255 // Cu layer (pad plane)
257 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
258 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
259 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
260 // G10 layer (support structure)
262 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
263 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
264 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
265 // Cu layer (FEE + signal lines)
267 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
268 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
269 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
270 // PE layer (cooling devices)
272 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
273 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
274 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
275 // Water layer (cooling)
277 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
278 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
279 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
283 //_____________________________________________________________________________
284 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global)
287 // Converts local pad-coordinates (row,col,time) into
288 // global ALICE reference frame coordinates (x,y,z)
291 Int_t icham = GetChamber(idet); // Chamber info (0-4)
292 Int_t isect = GetSector(idet); // Sector info (0-17)
293 Int_t iplan = GetPlane(idet); // Plane info (0-5)
295 return Local2Global(iplan,icham,isect,local,global);
299 //_____________________________________________________________________________
300 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
301 , Float_t *local, Float_t *global)
304 // Converts local pad-coordinates (row,col,time) into
305 // global ALICE reference frame coordinates (x,y,z)
308 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
310 Float_t padRow = local[0]; // Pad Row position
311 Float_t padCol = local[1]; // Pad Column position
312 Float_t timeSlice = local[2]; // Time "position"
314 Float_t row0 = GetRow0(iplan,icham,isect);
315 Float_t col0 = GetCol0(iplan);
316 Float_t time0 = GetTime0(iplan);
320 // calculate (x,y,z) position in rotated chamber
321 rot[0] = time0 + timeSlice * fTimeBinSize;
322 rot[1] = col0 + padCol * fColPadSize;
323 rot[2] = row0 + padRow * fRowPadSize;
325 // Rotate back to original position
326 return RotateBack(idet,rot,global);
330 //_____________________________________________________________________________
331 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot)
334 // Rotates all chambers in the position of sector 0 and transforms
335 // the coordinates in the ALICE restframe <pos> into the
336 // corresponding local frame <rot>.
339 Int_t sector = GetSector(d);
341 Float_t phi = -2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5);
343 rot[0] = pos[0] * TMath::Cos(phi) + pos[1] * TMath::Sin(phi);
344 rot[1] = -pos[0] * TMath::Sin(phi) + pos[1] * TMath::Cos(phi);
351 //_____________________________________________________________________________
352 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos)
355 // Rotates a chambers from the position of sector 0 into its
356 // original position and transforms the corresponding local frame
357 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
360 Int_t sector = GetSector(d);
362 Float_t phi = 2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5);
364 pos[0] = rot[0] * TMath::Cos(phi) + rot[1] * TMath::Sin(phi);
365 pos[1] = -rot[0] * TMath::Sin(phi) + rot[1] * TMath::Cos(phi);
372 //_____________________________________________________________________________
373 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s)
376 // Convert plane / chamber / sector into detector number
379 return (p + c * kNplan + s * kNplan * kNcham);
383 //_____________________________________________________________________________
384 Int_t AliTRDgeometry::GetPlane(Int_t d)
387 // Reconstruct the plane number from the detector number
390 return ((Int_t) (d % kNplan));
394 //_____________________________________________________________________________
395 Int_t AliTRDgeometry::GetChamber(Int_t d)
398 // Reconstruct the chamber number from the detector number
401 return ((Int_t) (d % (kNplan * kNcham)) / kNplan);
405 //_____________________________________________________________________________
406 Int_t AliTRDgeometry::GetSector(Int_t d)
409 // Reconstruct the sector number from the detector number
412 return ((Int_t) (d / (kNplan * kNcham)));
416 //_____________________________________________________________________________
417 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos, TMatrix &mat)
420 // Returns the global coordinate and error matrix of a AliTRDrecPoint
427 //_____________________________________________________________________________
428 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos)
431 // Returns the global coordinate and error matrix of a AliTRDrecPoint
434 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
438 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
439 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
440 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
442 if (Local2Global(detector,local,global)) {