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af26ce80 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
18 | //////////////////////////////////////////////////////////////////////////// | |
19 | // // | |
20 | // Transforms clusters into space points with calibrated positions // | |
21 | // defined in the local tracking system // | |
22 | // // | |
23 | //////////////////////////////////////////////////////////////////////////// | |
24 | ||
25 | #include <TGeoMatrix.h> | |
26 | ||
27 | #include "AliLog.h" | |
28 | #include "AliTracker.h" | |
29 | #include "AliCodeTimer.h" | |
30 | ||
31 | #include "AliTRDtransform.h" | |
32 | #include "AliTRDcluster.h" | |
33 | #include "AliTRDgeometry.h" | |
34 | #include "AliTRDpadPlane.h" | |
35 | #include "AliTRDCommonParam.h" | |
36 | #include "AliTRDcalibDB.h" | |
37 | #include "Cal/AliTRDCalDet.h" | |
38 | #include "Cal/AliTRDCalROC.h" | |
39 | ||
40 | ClassImp(AliTRDtransform) | |
41 | ||
42 | //_____________________________________________________________________________ | |
43 | //AliTRDtransform::AliTRDtransform() | |
44 | // :AliTransform() | |
45 | AliTRDtransform::AliTRDtransform() | |
46 | :TObject() | |
47 | ,fGeo(0x0) | |
48 | ,fDetector(0) | |
49 | ,fParam(0x0) | |
50 | ,fCalibration(0x0) | |
51 | ,fCalVdriftROC(0x0) | |
52 | ,fCalT0ROC(0x0) | |
53 | ,fCalVdriftDet(0x0) | |
54 | ,fCalT0Det(0x0) | |
55 | ,fCalVdriftDetValue(0) | |
56 | ,fCalT0DetValue(0) | |
57 | ,fSamplingFrequency(0) | |
58 | ,fPadPlane(0x0) | |
59 | ,fZShiftIdeal(0) | |
60 | ,fMatrix(0x0) | |
61 | { | |
62 | // | |
63 | // AliTRDtransform default constructor | |
64 | // | |
65 | ||
66 | } | |
67 | ||
68 | //_____________________________________________________________________________ | |
69 | //AliTRDtransform::AliTRDtransform(Int_t det) | |
70 | // :AliTransform() | |
71 | AliTRDtransform::AliTRDtransform(Int_t det) | |
72 | :TObject() | |
73 | ,fGeo(0x0) | |
74 | ,fDetector(0) | |
75 | ,fParam(0x0) | |
76 | ,fCalibration(0x0) | |
77 | ,fCalVdriftROC(0x0) | |
78 | ,fCalT0ROC(0x0) | |
79 | ,fCalVdriftDet(0x0) | |
80 | ,fCalT0Det(0x0) | |
81 | ,fCalVdriftDetValue(0) | |
82 | ,fCalT0DetValue(0) | |
83 | ,fSamplingFrequency(0) | |
84 | ,fPadPlane(0x0) | |
85 | ,fZShiftIdeal(0) | |
86 | ,fMatrix(0x0) | |
87 | { | |
88 | // | |
89 | // AliTRDtransform constructor for a given detector | |
90 | // | |
91 | ||
92 | fGeo = new AliTRDgeometry(); | |
9a96f175 | 93 | fGeo->CreateClusterMatrixArray(); |
af26ce80 | 94 | |
95 | fParam = AliTRDCommonParam::Instance(); | |
96 | if (!fParam) { | |
97 | AliError("Could not get common parameters\n"); | |
98 | } | |
99 | fSamplingFrequency = fParam->GetSamplingFrequency(); | |
100 | ||
101 | fCalibration = AliTRDcalibDB::Instance(); | |
102 | if (!fCalibration) { | |
103 | AliError("Cannot find calibration object"); | |
104 | } | |
105 | ||
106 | // Get the calibration objects for the global calibration | |
107 | fCalVdriftDet = fCalibration->GetVdriftDet(); | |
108 | fCalT0Det = fCalibration->GetT0Det(); | |
109 | ||
110 | SetDetector(det); | |
111 | ||
112 | } | |
113 | ||
114 | //_____________________________________________________________________________ | |
115 | //AliTRDtransform::AliTRDtransform(const AliTRDtransform &t) | |
116 | // :AliTransform(t) | |
117 | AliTRDtransform::AliTRDtransform(const AliTRDtransform &t) | |
118 | :TObject(t) | |
119 | ,fGeo(0x0) | |
120 | ,fDetector(t.fDetector) | |
121 | ,fParam(0x0) | |
122 | ,fCalibration(0x0) | |
123 | ,fCalVdriftROC(0x0) | |
124 | ,fCalT0ROC(0x0) | |
125 | ,fCalVdriftDet(0x0) | |
126 | ,fCalT0Det(0x0) | |
127 | ,fCalVdriftDetValue(0) | |
128 | ,fCalT0DetValue(0) | |
129 | ,fSamplingFrequency(0) | |
130 | ,fPadPlane(0x0) | |
131 | ,fZShiftIdeal(0) | |
132 | ,fMatrix(0x0) | |
133 | { | |
134 | // | |
135 | // AliTRDtransform copy constructor | |
136 | // | |
137 | ||
138 | if (fGeo) { | |
139 | delete fGeo; | |
140 | } | |
141 | fGeo = new AliTRDgeometry(); | |
9a96f175 | 142 | fGeo->CreateClusterMatrixArray(); |
af26ce80 | 143 | |
144 | fParam = AliTRDCommonParam::Instance(); | |
145 | if (!fParam) { | |
146 | AliError("Could not get common parameters\n"); | |
147 | } | |
148 | fSamplingFrequency = fParam->GetSamplingFrequency(); | |
149 | ||
150 | fCalibration = AliTRDcalibDB::Instance(); | |
151 | if (!fCalibration) { | |
152 | AliError("Cannot find calibration object"); | |
153 | } | |
154 | fCalVdriftDet = fCalibration->GetVdriftDet(); | |
155 | fCalT0Det = fCalibration->GetT0Det(); | |
156 | ||
157 | } | |
158 | ||
159 | //_____________________________________________________________________________ | |
160 | AliTRDtransform::~AliTRDtransform() | |
161 | { | |
162 | // | |
163 | // AliTRDtransform destructor | |
164 | // | |
165 | ||
166 | if (fGeo) { | |
167 | delete fGeo; | |
168 | } | |
169 | ||
170 | } | |
171 | ||
172 | //_____________________________________________________________________________ | |
173 | void AliTRDtransform::SetDetector(Int_t det) | |
174 | { | |
175 | // | |
176 | // Set to a new detector number and update the calibration objects | |
177 | // and values accordingly | |
178 | // | |
179 | ||
180 | fDetector = det; | |
181 | ||
182 | // Get the calibration objects for the pad-by-pad calibration | |
183 | fCalVdriftROC = fCalibration->GetVdriftROC(det); | |
184 | fCalT0ROC = fCalibration->GetT0ROC(det); | |
185 | ||
186 | // Get the detector wise defined calibration values | |
187 | fCalVdriftDetValue = fCalVdriftDet->GetValue(det); | |
188 | fCalT0DetValue = fCalT0Det->GetValue(det); | |
189 | ||
190 | // Shift needed to define Z-position relative to middle of chamber | |
191 | Int_t pla = fGeo->GetPlane(det); | |
192 | Int_t cha = fGeo->GetChamber(det); | |
193 | fPadPlane = fGeo->GetPadPlane(pla,cha); | |
194 | fZShiftIdeal = 0.5 * (fPadPlane->GetRow0() + fPadPlane->GetRowEnd()); | |
195 | ||
196 | // Get the current transformation matrix | |
9a96f175 | 197 | fMatrix = fGeo->GetClusterMatrix(det); |
af26ce80 | 198 | |
199 | } | |
200 | ||
201 | //_____________________________________________________________________________ | |
202 | void AliTRDtransform::Transform(Double_t *x, Int_t *i, UInt_t time | |
203 | , Int_t /*coordinateType*/) | |
204 | { | |
205 | // | |
206 | // Transforms the local cluster coordinates into calibrated | |
207 | // space point positions defined in the local tracking system. | |
208 | // | |
209 | // Here the calibration for T0, Vdrift and ExB is applied as well. | |
210 | // | |
211 | // Input: | |
212 | // x[0] = COL-position relative to the center pad (pad units) | |
213 | // x[1] = cluster signal in left pad | |
214 | // x[2] = cluster signal in middle pad | |
215 | // x[3] = cluster signal in right pad | |
216 | // i[0] = ROW pad number | |
217 | // i[1] = COL pad number | |
218 | // time = time bin number (uncalibrated for t0) | |
219 | // | |
220 | // Output: | |
221 | // x[0] = X-positions in tracking CS | |
222 | // x[1] = Y-positions in tracking CS | |
223 | // x[2] = Z-positions in tracking CS | |
224 | // x[3] = total cluster charge | |
225 | // x[4] = error in Y-direction | |
226 | // x[5] = error in Z-direction | |
227 | // i[2] = time bin number (calibrated for t0) | |
228 | // | |
229 | ||
230 | Double_t posLocal[3]; | |
231 | Double_t posTracking[3]; | |
232 | ||
233 | Int_t row = i[0]; | |
234 | Int_t col = i[1]; | |
235 | ||
236 | // Parameter to adjust the X position | |
237 | const Double_t kX0shift = 2.52; | |
238 | ||
1814b374 | 239 | if (!fMatrix) { |
240 | ||
241 | x[0] = 0.0; | |
242 | x[1] = 0.0; | |
243 | x[2] = 0.0; | |
244 | x[3] = 0.0; | |
245 | x[4] = 0.0; | |
246 | x[5] = 0.0; | |
247 | i[2] = 0; | |
248 | ||
af26ce80 | 249 | } |
1814b374 | 250 | else { |
251 | ||
252 | // Calibration values | |
253 | Double_t vdrift = fCalVdriftDetValue * fCalVdriftROC->GetValue(col,row); | |
254 | Double_t t0 = fCalT0DetValue + fCalT0ROC->GetValue(col,row); | |
255 | ||
256 | // T0 correction | |
257 | Double_t timeT0Cal = time - t0; | |
258 | // Calculate the X-position, | |
259 | Double_t xLocal = (timeT0Cal + 0.5) / fSamplingFrequency * vdrift; | |
260 | ||
261 | // Length of the amplification region | |
262 | Double_t ampLength = (Double_t) AliTRDgeometry::CamHght(); | |
263 | // The drift distance | |
264 | Double_t driftLength = TMath::Max(xLocal - 0.5*ampLength,0.0); | |
265 | // ExB correction | |
266 | Double_t exbCorr = fCalibration->GetOmegaTau(vdrift | |
267 | ,-0.1*AliTracker::GetBz()); | |
268 | ||
269 | // Pad dimensions | |
270 | Double_t rowSize = fPadPlane->GetRowSize(row); | |
271 | Double_t colSize = fPadPlane->GetColSize(col); | |
272 | ||
273 | // Invert the X-position, | |
274 | // apply ExB correction to the Y-position | |
275 | // and move to the Z-position relative to the middle of the chamber | |
276 | posLocal[0] = -xLocal; | |
277 | posLocal[1] = (fPadPlane->GetColPos(col) - (x[0] + 0.5) * colSize) - driftLength * exbCorr; | |
278 | posLocal[2] = (fPadPlane->GetRowPos(row) - 0.5 * rowSize) - fZShiftIdeal; | |
279 | ||
280 | // Go to tracking coordinates | |
281 | fMatrix->LocalToMaster(posLocal,posTracking); | |
282 | ||
283 | // The total charge of the cluster | |
284 | Double_t q0 = x[1]; | |
285 | Double_t q1 = x[2]; | |
286 | Double_t q2 = x[3]; | |
287 | Double_t clusterCharge = q0 + q1 + q2; | |
288 | Double_t clusterSigmaY2 = 0.0; | |
289 | if (clusterCharge > 0.0) { | |
290 | clusterSigmaY2 = (q1 * (q0 + q2) + 4.0 * q0 * q2) | |
291 | / (clusterCharge*clusterCharge); | |
292 | } | |
293 | ||
294 | // Output values | |
295 | x[0] = posTracking[0] + kX0shift; | |
296 | x[1] = posTracking[1]; | |
297 | x[2] = posTracking[2]; | |
298 | x[3] = clusterCharge; | |
299 | x[4] = colSize*colSize * (clusterSigmaY2 + 1.0/12.0); | |
300 | x[5] = rowSize*rowSize / 12.0; | |
301 | i[2] = TMath::Nint(timeT0Cal); | |
af26ce80 | 302 | |
1814b374 | 303 | } |
af26ce80 | 304 | |
305 | } | |
306 | ||
307 | //_____________________________________________________________________________ | |
308 | void AliTRDtransform::Recalibrate(AliTRDcluster *c, Bool_t setDet) | |
309 | { | |
310 | // | |
311 | // Recalibrates the position of a given cluster | |
312 | // If <setDet> is TRUE, the detector number is set for each cluster | |
313 | // automatically. Otherwise, AliTRDtransform::SetDetector() has to | |
314 | // be used. | |
315 | // | |
316 | ||
317 | if (setDet) { | |
318 | SetDetector(c->GetDetector()); | |
319 | } | |
320 | ||
321 | // Transform the local cluster coordinates into recalibrated | |
322 | // space point positions defined in the local tracking system. | |
323 | // Here the calibration for T0, Vdrift and ExB is applied as well. | |
324 | Double_t clusterXYZ[6]; | |
325 | clusterXYZ[0] = c->GetCenter(); | |
326 | clusterXYZ[1] = 0.0; | |
327 | clusterXYZ[2] = 0.0; | |
328 | clusterXYZ[3] = 0.0; | |
329 | clusterXYZ[4] = 0.0; | |
330 | clusterXYZ[5] = 0.0; | |
331 | Int_t clusterRCT[3]; | |
332 | clusterRCT[0] = c->GetPadRow(); | |
333 | clusterRCT[1] = c->GetPadCol(); | |
334 | clusterRCT[2] = 0; | |
335 | Int_t time = c->GetPadTime(); | |
336 | Transform(clusterXYZ,clusterRCT,((UInt_t) time),0); | |
337 | ||
338 | // Set the recalibrated coordinates | |
339 | c->SetX(clusterXYZ[0]); | |
340 | c->SetY(clusterXYZ[1]); | |
341 | c->SetZ(clusterXYZ[2]); | |
342 | c->SetLocalTimeBin(((Char_t) clusterRCT[2])); | |
343 | ||
344 | } |