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 1.3 2000/06/07 16:25:37 cblume
19 Try to remove compiler warnings on Sun and HP
21 Revision 1.2 2000/05/08 16:17:27 cblume
24 Revision 1.1.4.1 2000/05/08 14:45:55 cblume
25 Bug fix in RotateBack(). Geometry update
27 Revision 1.1 2000/02/28 19:00:44 cblume
32 ///////////////////////////////////////////////////////////////////////////////
34 // TRD geometry class //
36 ///////////////////////////////////////////////////////////////////////////////
38 #include "AliTRDgeometry.h"
39 #include "AliTRDrecPoint.h"
41 ClassImp(AliTRDgeometry)
43 //_____________________________________________________________________________
44 AliTRDgeometry::AliTRDgeometry():AliGeometry()
47 // AliTRDgeometry default constructor
54 //_____________________________________________________________________________
55 AliTRDgeometry::~AliTRDgeometry()
58 // AliTRDgeometry destructor
63 //_____________________________________________________________________________
64 void AliTRDgeometry::Init()
67 // Initializes the geometry parameter
72 // The width of the chambers
80 // The default pad dimensions
85 // The maximum number of pads
86 // and the position of pad 0,0,0
88 // chambers seen from the top:
89 // +----------------------------+
95 // +----------------------------+ +------>
97 // chambers seen from the side: ^
98 // +----------------------------+ time|
101 // +----------------------------+ +------>
105 // The pad column (rphi-direction)
106 for (iplan = 0; iplan < kNplan; iplan++) {
107 fColMax[iplan] = 1 + TMath::Nint((fCwidth[iplan] - 2. * kCcthick)
108 / fColPadSize - 0.5);
109 fCol0[iplan] = -fCwidth[iplan]/2. + kCcthick;
113 fTimeMax = 1 + TMath::Nint(kDrThick / fTimeBinSize - 0.5);
114 for (iplan = 0; iplan < kNplan; iplan++) {
115 fTime0[iplan] = kRmin + kCcframe/2. + kDrZpos - 0.5 * kDrThick
116 + iplan * (kCheight + kCspace);
121 //_____________________________________________________________________________
122 void AliTRDgeometry::CreateGeometry(Int_t *idtmed)
125 // Create the TRD geometry
127 // Author: Christoph Blume (C.Blume@gsi.de) 20/07/99
130 // TRD1-3 (Air) --- The TRD mother volumes for one sector.
131 // To be placed into the spaceframe.
133 // UAFI(/M/O) (Al) --- The aluminum frame of the inner(/middle/outer) chambers (readout)
134 // UCFI(/M/O) (C) --- The carbon frame of the inner(/middle/outer) chambers
135 // (driftchamber + radiator)
136 // UAII(/M/O) (Air) --- The inner part of the readout of the inner(/middle/outer) chambers
137 // UFII(/M/O) (Air) --- The inner part of the chamner and radiator of the
138 // inner(/middle/outer) chambers
140 // The material layers in one chamber:
141 // UL01 (G10) --- The gas seal of the radiator
142 // UL02 (CO2) --- The gas in the radiator
143 // UL03 (PE) --- The foil stack
144 // UL04 (Mylar) --- Entrance window to the driftvolume and HV-cathode
145 // UL05 (Xe) --- The driftvolume
146 // UL06 (Xe) --- The amplification region
148 // UL07 (Cu) --- The pad plane
149 // UL08 (G10) --- The Nomex honeycomb support structure
150 // UL09 (Cu) --- FEE and signal lines
151 // UL10 (PE) --- The cooling devices
152 // UL11 (Water) --- The cooling water
154 const Int_t kNparCha = 3;
157 Float_t parCha[kNparCha];
159 Float_t xpos, ypos, zpos;
161 // The aluminum frames - readout + electronics (Al)
162 // The inner chambers
163 gMC->Gsvolu("UAFI","BOX ",idtmed[1301-1],parDum,0);
164 // The middle chambers
165 gMC->Gsvolu("UAFM","BOX ",idtmed[1301-1],parDum,0);
166 // The outer chambers
167 gMC->Gsvolu("UAFO","BOX ",idtmed[1301-1],parDum,0);
169 // The inner part of the aluminum frames (Air)
170 // The inner chambers
171 gMC->Gsvolu("UAII","BOX ",idtmed[1302-1],parDum,0);
172 // The middle chambers
173 gMC->Gsvolu("UAIM","BOX ",idtmed[1302-1],parDum,0);
174 // The outer chambers
175 gMC->Gsvolu("UAIO","BOX ",idtmed[1302-1],parDum,0);
177 // The carbon frames - radiator + driftchamber (C)
178 // The inner chambers
179 gMC->Gsvolu("UCFI","BOX ",idtmed[1307-1],parDum,0);
180 // The middle chambers
181 gMC->Gsvolu("UCFM","BOX ",idtmed[1307-1],parDum,0);
182 // The outer chambers
183 gMC->Gsvolu("UCFO","BOX ",idtmed[1307-1],parDum,0);
185 // The inner part of the carbon frames (Air)
186 // The inner chambers
187 gMC->Gsvolu("UCII","BOX ",idtmed[1302-1],parDum,0);
188 // The middle chambers
189 gMC->Gsvolu("UCIM","BOX ",idtmed[1302-1],parDum,0);
190 // The outer chambers
191 gMC->Gsvolu("UCIO","BOX ",idtmed[1302-1],parDum,0);
193 // The material layers inside the chambers
196 // G10 layer (radiator seal)
197 parCha[2] = kSeThick/2;
198 gMC->Gsvolu("UL01","BOX ",idtmed[1313-1],parCha,kNparCha);
199 // CO2 layer (radiator)
200 parCha[2] = kRaThick/2;
201 gMC->Gsvolu("UL02","BOX ",idtmed[1312-1],parCha,kNparCha);
202 // PE layer (radiator)
203 parCha[2] = kPeThick/2;
204 gMC->Gsvolu("UL03","BOX ",idtmed[1303-1],parCha,kNparCha);
205 // Mylar layer (entrance window + HV cathode)
206 parCha[2] = kMyThick/2;
207 gMC->Gsvolu("UL04","BOX ",idtmed[1308-1],parCha,kNparCha);
208 // Xe/Isobutane layer (drift volume, sensitive)
209 parCha[2] = kDrThick/2.;
210 gMC->Gsvolu("UL05","BOX ",idtmed[1309-1],parCha,kNparCha);
211 // Xe/Isobutane layer (amplification volume, not sensitive)
212 parCha[2] = kAmThick/2.;
213 gMC->Gsvolu("UL06","BOX ",idtmed[1309-1],parCha,kNparCha);
215 // Cu layer (pad plane)
216 parCha[2] = kCuThick/2;
217 gMC->Gsvolu("UL07","BOX ",idtmed[1305-1],parCha,kNparCha);
218 // G10 layer (support structure)
219 parCha[2] = kSuThick/2;
220 gMC->Gsvolu("UL08","BOX ",idtmed[1313-1],parCha,kNparCha);
221 // Cu layer (FEE + signal lines)
222 parCha[2] = kFeThick/2;
223 gMC->Gsvolu("UL09","BOX ",idtmed[1305-1],parCha,kNparCha);
224 // PE layer (cooling devices)
225 parCha[2] = kCoThick/2;
226 gMC->Gsvolu("UL10","BOX ",idtmed[1303-1],parCha,kNparCha);
227 // Water layer (cooling)
228 parCha[2] = kWaThick/2;
229 gMC->Gsvolu("UL11","BOX ",idtmed[1314-1],parCha,kNparCha);
231 // Position the layers in the chambers
235 // G10 layer (radiator seal)
237 gMC->Gspos("UL01",1,"UCII",xpos,ypos,zpos,0,"ONLY");
238 gMC->Gspos("UL01",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
239 gMC->Gspos("UL01",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
240 // CO2 layer (radiator)
242 gMC->Gspos("UL02",1,"UCII",xpos,ypos,zpos,0,"ONLY");
243 gMC->Gspos("UL02",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
244 gMC->Gspos("UL02",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
245 // PE layer (radiator)
247 gMC->Gspos("UL03",1,"UL02",xpos,ypos,zpos,0,"ONLY");
248 // Mylar layer (entrance window + HV cathode)
250 gMC->Gspos("UL04",1,"UCII",xpos,ypos,zpos,0,"ONLY");
251 gMC->Gspos("UL04",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
252 gMC->Gspos("UL04",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
253 // Xe/Isobutane layer (drift volume)
255 gMC->Gspos("UL05",1,"UCII",xpos,ypos,zpos,0,"ONLY");
256 gMC->Gspos("UL05",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
257 gMC->Gspos("UL05",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
258 // Xe/Isobutane layer (amplification volume)
260 gMC->Gspos("UL06",1,"UCII",xpos,ypos,zpos,0,"ONLY");
261 gMC->Gspos("UL06",2,"UCIM",xpos,ypos,zpos,0,"ONLY");
262 gMC->Gspos("UL06",3,"UCIO",xpos,ypos,zpos,0,"ONLY");
264 // Cu layer (pad plane)
266 gMC->Gspos("UL07",1,"UAII",xpos,ypos,zpos,0,"ONLY");
267 gMC->Gspos("UL07",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
268 gMC->Gspos("UL07",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
269 // G10 layer (support structure)
271 gMC->Gspos("UL08",1,"UAII",xpos,ypos,zpos,0,"ONLY");
272 gMC->Gspos("UL08",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
273 gMC->Gspos("UL08",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
274 // Cu layer (FEE + signal lines)
276 gMC->Gspos("UL09",1,"UAII",xpos,ypos,zpos,0,"ONLY");
277 gMC->Gspos("UL09",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
278 gMC->Gspos("UL09",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
279 // PE layer (cooling devices)
281 gMC->Gspos("UL10",1,"UAII",xpos,ypos,zpos,0,"ONLY");
282 gMC->Gspos("UL10",2,"UAIM",xpos,ypos,zpos,0,"ONLY");
283 gMC->Gspos("UL10",3,"UAIO",xpos,ypos,zpos,0,"ONLY");
284 // Water layer (cooling)
286 gMC->Gspos("UL11",1,"UAII",xpos,ypos,zpos,0,"ONLY");
287 gMC->Gspos("UL11",1,"UAIM",xpos,ypos,zpos,0,"ONLY");
288 gMC->Gspos("UL11",1,"UAIO",xpos,ypos,zpos,0,"ONLY");
292 //_____________________________________________________________________________
293 Bool_t AliTRDgeometry::Local2Global(Int_t idet, Float_t *local, Float_t *global)
296 // Converts local pad-coordinates (row,col,time) into
297 // global ALICE reference frame coordinates (x,y,z)
300 Int_t icham = GetChamber(idet); // Chamber info (0-4)
301 Int_t isect = GetSector(idet); // Sector info (0-17)
302 Int_t iplan = GetPlane(idet); // Plane info (0-5)
304 return Local2Global(iplan,icham,isect,local,global);
308 //_____________________________________________________________________________
309 Bool_t AliTRDgeometry::Local2Global(Int_t iplan, Int_t icham, Int_t isect
310 , Float_t *local, Float_t *global)
313 // Converts local pad-coordinates (row,col,time) into
314 // global ALICE reference frame coordinates (x,y,z)
317 Int_t idet = GetDetector(iplan,icham,isect); // Detector number
319 Float_t padRow = local[0]; // Pad Row position
320 Float_t padCol = local[1]; // Pad Column position
321 Float_t timeSlice = local[2]; // Time "position"
323 Float_t row0 = GetRow0(iplan,icham,isect);
324 Float_t col0 = GetCol0(iplan);
325 Float_t time0 = GetTime0(iplan);
329 // calculate (x,y,z) position in rotated chamber
330 rot[0] = time0 + timeSlice * fTimeBinSize;
331 rot[1] = col0 + padCol * fColPadSize;
332 rot[2] = row0 + padRow * fRowPadSize;
334 // Rotate back to original position
335 return RotateBack(idet,rot,global);
339 //_____________________________________________________________________________
340 Bool_t AliTRDgeometry::Rotate(Int_t d, Float_t *pos, Float_t *rot)
343 // Rotates all chambers in the position of sector 0 and transforms
344 // the coordinates in the ALICE restframe <pos> into the
345 // corresponding local frame <rot>.
348 Int_t sector = GetSector(d);
350 Float_t phi = -2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5);
352 rot[0] = pos[0] * TMath::Cos(phi) + pos[1] * TMath::Sin(phi);
353 rot[1] = -pos[0] * TMath::Sin(phi) + pos[1] * TMath::Cos(phi);
360 //_____________________________________________________________________________
361 Bool_t AliTRDgeometry::RotateBack(Int_t d, Float_t *rot, Float_t *pos)
364 // Rotates a chambers from the position of sector 0 into its
365 // original position and transforms the corresponding local frame
366 // coordinates <rot> into the coordinates of the ALICE restframe <pos>.
369 Int_t sector = GetSector(d);
371 Float_t phi = 2.0 * kPI / (Float_t) kNsect * ((Float_t) sector + 0.5);
373 pos[0] = rot[0] * TMath::Cos(phi) + rot[1] * TMath::Sin(phi);
374 pos[1] = -rot[0] * TMath::Sin(phi) + rot[1] * TMath::Cos(phi);
381 //_____________________________________________________________________________
382 Int_t AliTRDgeometry::GetDetector(Int_t p, Int_t c, Int_t s)
385 // Convert plane / chamber / sector into detector number
388 return (p + c * kNplan + s * kNplan * kNcham);
392 //_____________________________________________________________________________
393 Int_t AliTRDgeometry::GetPlane(Int_t d)
396 // Reconstruct the plane number from the detector number
399 return ((Int_t) (d % kNplan));
403 //_____________________________________________________________________________
404 Int_t AliTRDgeometry::GetChamber(Int_t d)
407 // Reconstruct the chamber number from the detector number
410 return ((Int_t) (d % (kNplan * kNcham)) / kNplan);
414 //_____________________________________________________________________________
415 Int_t AliTRDgeometry::GetSector(Int_t d)
418 // Reconstruct the sector number from the detector number
421 return ((Int_t) (d / (kNplan * kNcham)));
425 //_____________________________________________________________________________
426 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos, TMatrix &mat)
429 // Returns the global coordinate and error matrix of a AliTRDrecPoint
437 //_____________________________________________________________________________
438 void AliTRDgeometry::GetGlobal(const AliRecPoint *p, TVector3 &pos)
441 // Returns the global coordinate and error matrix of a AliTRDrecPoint
444 Int_t detector = ((AliTRDrecPoint *) p)->GetDetector();
448 local[0] = ((AliTRDrecPoint *) p)->GetLocalRow();
449 local[1] = ((AliTRDrecPoint *) p)->GetLocalCol();
450 local[2] = ((AliTRDrecPoint *) p)->GetLocalTime();
452 if (Local2Global(detector,local,global)) {