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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" | |
af26ce80 | 28 | |
29 | #include "AliTRDtransform.h" | |
30 | #include "AliTRDcluster.h" | |
31 | #include "AliTRDgeometry.h" | |
32 | #include "AliTRDpadPlane.h" | |
33 | #include "AliTRDCommonParam.h" | |
34 | #include "AliTRDcalibDB.h" | |
35 | #include "Cal/AliTRDCalDet.h" | |
36 | #include "Cal/AliTRDCalROC.h" | |
37 | ||
38 | ClassImp(AliTRDtransform) | |
39 | ||
40 | //_____________________________________________________________________________ | |
af26ce80 | 41 | AliTRDtransform::AliTRDtransform() |
42 | :TObject() | |
43 | ,fGeo(0x0) | |
44 | ,fDetector(0) | |
45 | ,fParam(0x0) | |
46 | ,fCalibration(0x0) | |
47 | ,fCalVdriftROC(0x0) | |
48 | ,fCalT0ROC(0x0) | |
a60b4183 | 49 | ,fCalPRFROC(0x0) |
c893147d | 50 | ,fkCalVdriftDet(0x0) |
51 | ,fkCalT0Det(0x0) | |
af26ce80 | 52 | ,fCalVdriftDetValue(0) |
53 | ,fCalT0DetValue(0) | |
54 | ,fSamplingFrequency(0) | |
55 | ,fPadPlane(0x0) | |
56 | ,fZShiftIdeal(0) | |
57 | ,fMatrix(0x0) | |
58 | { | |
59 | // | |
60 | // AliTRDtransform default constructor | |
61 | // | |
62 | ||
63 | } | |
64 | ||
65 | //_____________________________________________________________________________ | |
af26ce80 | 66 | AliTRDtransform::AliTRDtransform(Int_t det) |
67 | :TObject() | |
68 | ,fGeo(0x0) | |
69 | ,fDetector(0) | |
70 | ,fParam(0x0) | |
71 | ,fCalibration(0x0) | |
72 | ,fCalVdriftROC(0x0) | |
73 | ,fCalT0ROC(0x0) | |
a60b4183 | 74 | ,fCalPRFROC(0x0) |
c893147d | 75 | ,fkCalVdriftDet(0x0) |
76 | ,fkCalT0Det(0x0) | |
af26ce80 | 77 | ,fCalVdriftDetValue(0) |
78 | ,fCalT0DetValue(0) | |
79 | ,fSamplingFrequency(0) | |
80 | ,fPadPlane(0x0) | |
81 | ,fZShiftIdeal(0) | |
82 | ,fMatrix(0x0) | |
83 | { | |
84 | // | |
85 | // AliTRDtransform constructor for a given detector | |
86 | // | |
87 | ||
88 | fGeo = new AliTRDgeometry(); | |
a938cf15 | 89 | if (!fGeo->CreateClusterMatrixArray()) { |
90 | AliError("Could not get transformation matrices\n"); | |
91 | } | |
af26ce80 | 92 | |
93 | fParam = AliTRDCommonParam::Instance(); | |
94 | if (!fParam) { | |
95 | AliError("Could not get common parameters\n"); | |
96 | } | |
97 | fSamplingFrequency = fParam->GetSamplingFrequency(); | |
98 | ||
99 | fCalibration = AliTRDcalibDB::Instance(); | |
100 | if (!fCalibration) { | |
101 | AliError("Cannot find calibration object"); | |
102 | } | |
103 | ||
104 | // Get the calibration objects for the global calibration | |
c893147d | 105 | fkCalVdriftDet = fCalibration->GetVdriftDet(); |
106 | fkCalT0Det = fCalibration->GetT0Det(); | |
af26ce80 | 107 | |
108 | SetDetector(det); | |
109 | ||
110 | } | |
111 | ||
112 | //_____________________________________________________________________________ | |
af26ce80 | 113 | AliTRDtransform::AliTRDtransform(const AliTRDtransform &t) |
114 | :TObject(t) | |
115 | ,fGeo(0x0) | |
116 | ,fDetector(t.fDetector) | |
117 | ,fParam(0x0) | |
118 | ,fCalibration(0x0) | |
119 | ,fCalVdriftROC(0x0) | |
120 | ,fCalT0ROC(0x0) | |
a60b4183 | 121 | ,fCalPRFROC(0x0) |
c893147d | 122 | ,fkCalVdriftDet(0x0) |
123 | ,fkCalT0Det(0x0) | |
af26ce80 | 124 | ,fCalVdriftDetValue(0) |
125 | ,fCalT0DetValue(0) | |
126 | ,fSamplingFrequency(0) | |
127 | ,fPadPlane(0x0) | |
128 | ,fZShiftIdeal(0) | |
129 | ,fMatrix(0x0) | |
130 | { | |
131 | // | |
132 | // AliTRDtransform copy constructor | |
133 | // | |
134 | ||
135 | if (fGeo) { | |
136 | delete fGeo; | |
137 | } | |
138 | fGeo = new AliTRDgeometry(); | |
9a96f175 | 139 | fGeo->CreateClusterMatrixArray(); |
af26ce80 | 140 | |
141 | fParam = AliTRDCommonParam::Instance(); | |
142 | if (!fParam) { | |
143 | AliError("Could not get common parameters\n"); | |
144 | } | |
145 | fSamplingFrequency = fParam->GetSamplingFrequency(); | |
146 | ||
147 | fCalibration = AliTRDcalibDB::Instance(); | |
148 | if (!fCalibration) { | |
149 | AliError("Cannot find calibration object"); | |
150 | } | |
c893147d | 151 | fkCalVdriftDet = fCalibration->GetVdriftDet(); |
152 | fkCalT0Det = fCalibration->GetT0Det(); | |
af26ce80 | 153 | |
154 | } | |
155 | ||
156 | //_____________________________________________________________________________ | |
157 | AliTRDtransform::~AliTRDtransform() | |
158 | { | |
159 | // | |
160 | // AliTRDtransform destructor | |
161 | // | |
162 | ||
163 | if (fGeo) { | |
164 | delete fGeo; | |
165 | } | |
166 | ||
167 | } | |
168 | ||
169 | //_____________________________________________________________________________ | |
170 | void AliTRDtransform::SetDetector(Int_t det) | |
171 | { | |
172 | // | |
173 | // Set to a new detector number and update the calibration objects | |
174 | // and values accordingly | |
175 | // | |
176 | ||
177 | fDetector = det; | |
178 | ||
179 | // Get the calibration objects for the pad-by-pad calibration | |
180 | fCalVdriftROC = fCalibration->GetVdriftROC(det); | |
181 | fCalT0ROC = fCalibration->GetT0ROC(det); | |
a60b4183 | 182 | fCalPRFROC = fCalibration->GetPRFROC(det); |
af26ce80 | 183 | |
184 | // Get the detector wise defined calibration values | |
c893147d | 185 | fCalVdriftDetValue = fkCalVdriftDet->GetValue(det); |
186 | fCalT0DetValue = fkCalT0Det->GetValue(det); | |
af26ce80 | 187 | |
188 | // Shift needed to define Z-position relative to middle of chamber | |
053767a4 | 189 | Int_t layer = fGeo->GetLayer(det); |
190 | Int_t stack = fGeo->GetStack(det); | |
191 | fPadPlane = fGeo->GetPadPlane(layer,stack); | |
af26ce80 | 192 | fZShiftIdeal = 0.5 * (fPadPlane->GetRow0() + fPadPlane->GetRowEnd()); |
193 | ||
194 | // Get the current transformation matrix | |
9a96f175 | 195 | fMatrix = fGeo->GetClusterMatrix(det); |
af26ce80 | 196 | |
197 | } | |
198 | ||
199 | //_____________________________________________________________________________ | |
b72f4eaf | 200 | Bool_t AliTRDtransform::Transform(AliTRDcluster *c) |
af26ce80 | 201 | { |
202 | // | |
203 | // Transforms the local cluster coordinates into calibrated | |
204 | // space point positions defined in the local tracking system. | |
205 | // | |
206 | // Here the calibration for T0, Vdrift and ExB is applied as well. | |
207 | // | |
b72f4eaf | 208 | // Input: Cluster in the local chamber coordinates |
209 | // Output: Tracking cluster | |
af26ce80 | 210 | |
b72f4eaf | 211 | if (!fMatrix) return kFALSE; |
af26ce80 | 212 | |
af26ce80 | 213 | |
b72f4eaf | 214 | // Parameters to adjust the X position of clusters in the alignable volume |
ec3f0161 | 215 | const Double_t kX0shift = AliTRDgeometry::AnodePos(); //[cm] |
1814b374 | 216 | |
1814b374 | 217 | |
b72f4eaf | 218 | // Retrieve calibration values |
219 | Int_t col = c->GetPadCol(), row = c->GetPadRow(); | |
220 | // drift velocity | |
221 | Double_t vd = fCalVdriftDetValue * fCalVdriftROC->GetValue(col,row); | |
222 | // t0 | |
223 | Double_t t0 = fCalT0DetValue + fCalT0ROC->GetValue(col,row); | |
566bf887 | 224 | t0 /= fSamplingFrequency; |
b72f4eaf | 225 | // ExB correction |
226 | Double_t exb = AliTRDCommonParam::Instance()->GetOmegaTau(vd); | |
227 | ||
228 | Float_t x = c->GetXloc(t0, vd); | |
229 | ||
b72f4eaf | 230 | // Pad dimensions |
231 | Double_t rs = fPadPlane->GetRowSize(row); | |
232 | Double_t cs = fPadPlane->GetColSize(col); | |
1fd9389f | 233 | |
234 | // cluster error with diffusion corrections | |
235 | Double_t s2 = cs*fCalPRFROC->GetValue(col, row); | |
236 | s2 *= s2; | |
237 | Float_t dl, dt; | |
238 | AliTRDCommonParam::Instance()->GetDiffCoeff(dl, dt, vd); | |
239 | ||
b72f4eaf | 240 | Double_t y0 = fPadPlane->GetColPos(col) + .5*cs; |
241 | Double_t loc[] = { | |
242 | kX0shift-x, // Invert the X-position, | |
243 | c->GetYloc(y0, s2, cs) - x*exb,// apply ExB correction | |
244 | fPadPlane->GetRowPos(row) - .5*rs - fZShiftIdeal // move the Z-position relative to the middle of the chamber | |
245 | }; | |
246 | ||
247 | // Go to tracking coordinates | |
248 | Double_t trk[3]; | |
249 | fMatrix->LocalToMaster(loc, trk); | |
250 | ||
251 | // store tracking values | |
252 | c->SetX(trk[0]);c->SetY(trk[1]);c->SetZ(trk[2]); | |
1fd9389f | 253 | c->SetSigmaY2(s2, dt, exb, x); |
b72f4eaf | 254 | c->SetSigmaZ2(fPadPlane->GetRowSize(row)*fPadPlane->GetRowSize(row)/12.); |
255 | ||
256 | return kTRUE; | |
c893147d | 257 | |
af26ce80 | 258 | } |
259 | ||
260 | //_____________________________________________________________________________ | |
261 | void AliTRDtransform::Recalibrate(AliTRDcluster *c, Bool_t setDet) | |
262 | { | |
263 | // | |
264 | // Recalibrates the position of a given cluster | |
265 | // If <setDet> is TRUE, the detector number is set for each cluster | |
266 | // automatically. Otherwise, AliTRDtransform::SetDetector() has to | |
267 | // be used. | |
268 | // | |
269 | ||
b72f4eaf | 270 | if (setDet) SetDetector(c->GetDetector()); |
271 | Transform(c); | |
c893147d | 272 | |
af26ce80 | 273 | } |