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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 | //------------------------------------------------------- | |
17 | // Implementation of the TPC transformation class | |
18 | // | |
19 | // Origin: Marian Ivanov Marian.Ivanov@cern.ch | |
20 | // Magnus Mager | |
21 | // | |
22 | // Class for tranformation of the coordinate frame | |
23 | // Transformation | |
24 | // local coordinate frame (sector, padrow, pad, timebine) ==> | |
25 | // rotated global (tracking) cooridnate frame (sector, lx,ly,lz) | |
26 | // | |
27 | // Unisochronity - (substract time0 - pad by pad) | |
28 | // Drift velocity - Currently common drift velocity - functionality of AliTPCParam | |
29 | // ExB effect - | |
30 | // | |
31 | // Time of flight correction - | |
32 | // - Depends on the vertex position | |
33 | // - by default | |
34 | // | |
35 | // Usage: | |
36 | // AliTPCclustererMI::AddCluster | |
37 | // AliTPCtrackerMI::Transform | |
38 | // | |
39 | //------------------------------------------------------- | |
40 | ||
41 | /* To test it: | |
42 | cdb=AliCDBManager::Instance() | |
43 | cdb->SetDefaultStorage("local:///u/mmager/mycalib1") | |
44 | c=AliTPCcalibDB::Instance() | |
45 | c->SetRun(0) | |
46 | Double_t x[]={1.0,2.0,3.0} | |
47 | Int_t i[]={4} | |
48 | AliTPCTransform trafo | |
49 | trafo.Transform(x,i,0,1) | |
50 | */ | |
51 | ||
52 | /* $Id$ */ | |
53 | ||
54 | #include "AliTPCROC.h" | |
55 | #include "AliTPCCalPad.h" | |
56 | #include "AliTPCCalROC.h" | |
57 | #include "AliTPCcalibDB.h" | |
58 | #include "AliTPCParam.h" | |
59 | #include "TMath.h" | |
60 | #include "AliLog.h" | |
61 | #include "AliTPCExB.h" | |
62 | #include "AliTPCCorrection.h" | |
63 | #include "TGeoMatrix.h" | |
64 | #include "AliTPCRecoParam.h" | |
65 | #include "AliTPCCalibVdrift.h" | |
66 | #include "AliTPCTransform.h" | |
67 | #include "AliMagF.h" | |
68 | #include "TGeoGlobalMagField.h" | |
69 | #include "AliTracker.h" | |
70 | #include <AliCTPTimeParams.h> | |
71 | ||
72 | ClassImp(AliTPCTransform) | |
73 | ||
74 | ||
75 | AliTPCTransform::AliTPCTransform(): | |
76 | AliTransform(), | |
77 | fCurrentRecoParam(0), //! current reconstruction parameters | |
78 | fCurrentRun(0), //! current run | |
79 | fCurrentTimeStamp(0) //! current time stamp | |
80 | { | |
81 | // | |
82 | // Speed it up a bit! | |
83 | // | |
84 | for (Int_t i=0;i<18;++i) { | |
85 | Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18)); | |
86 | fSins[i]=TMath::Sin(alpha); | |
87 | fCoss[i]=TMath::Cos(alpha); | |
88 | } | |
89 | fPrimVtx[0]=0; | |
90 | fPrimVtx[1]=0; | |
91 | fPrimVtx[2]=0; | |
92 | } | |
93 | AliTPCTransform::AliTPCTransform(const AliTPCTransform& transform): | |
94 | AliTransform(transform), | |
95 | fCurrentRecoParam(transform.fCurrentRecoParam), //! current reconstruction parameters | |
96 | fCurrentRun(transform.fCurrentRun), //! current run | |
97 | fCurrentTimeStamp(transform.fCurrentTimeStamp) //! current time stamp | |
98 | { | |
99 | // | |
100 | // Speed it up a bit! | |
101 | // | |
102 | for (Int_t i=0;i<18;++i) { | |
103 | Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18)); | |
104 | fSins[i]=TMath::Sin(alpha); | |
105 | fCoss[i]=TMath::Cos(alpha); | |
106 | } | |
107 | fPrimVtx[0]=0; | |
108 | fPrimVtx[1]=0; | |
109 | fPrimVtx[2]=0; | |
110 | } | |
111 | ||
112 | AliTPCTransform::~AliTPCTransform() { | |
113 | // | |
114 | // Destructor | |
115 | // | |
116 | } | |
117 | ||
118 | void AliTPCTransform::SetPrimVertex(Double_t *vtx){ | |
119 | // | |
120 | // | |
121 | // | |
122 | fPrimVtx[0]=vtx[0]; | |
123 | fPrimVtx[1]=vtx[1]; | |
124 | fPrimVtx[2]=vtx[2]; | |
125 | } | |
126 | ||
127 | ||
128 | void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/, | |
129 | Int_t /*coordinateType*/) { | |
130 | // input: x[0] - pad row | |
131 | // x[1] - pad | |
132 | // x[2] - time in us | |
133 | // i[0] - sector | |
134 | // output: x[0] - x (all in the rotated global coordinate frame) | |
135 | // x[1] - y | |
136 | // x[2] - z | |
137 | // | |
138 | // primvtx - position of the primary vertex | |
139 | // used for the TOF correction | |
140 | // TOF of particle calculated assuming the speed-of-light and | |
141 | // line approximation | |
142 | // | |
143 | if (!fCurrentRecoParam) { | |
144 | return; | |
145 | } | |
146 | Int_t row=TMath::Nint(x[0]); | |
147 | Int_t pad=TMath::Nint(x[1]); | |
148 | Int_t sector=i[0]; | |
149 | AliTPCcalibDB* calib=AliTPCcalibDB::Instance(); | |
150 | // | |
151 | AliTPCCalPad * time0TPC = calib->GetPadTime0(); | |
152 | AliTPCCalPad * distortionMapY = calib->GetDistortionMap(0); | |
153 | AliTPCCalPad * distortionMapZ = calib->GetDistortionMap(1); | |
154 | AliTPCCalPad * distortionMapR = calib->GetDistortionMap(2); | |
155 | AliTPCParam * param = calib->GetParameters(); | |
156 | AliTPCCorrection * correction = calib->GetTPCComposedCorrection(); // first user defined correction // if does not exist try to get it from calibDB array | |
157 | if (!correction) correction = calib->GetTPCComposedCorrection(AliTracker::GetBz()); | |
158 | if (!time0TPC){ | |
159 | AliFatal("Time unisochronity missing"); | |
160 | return ; // make coverity happy | |
161 | } | |
162 | AliTPCCorrection * correctionDelta = calib->GetTPCComposedCorrectionDelta(); | |
163 | ||
164 | if (!param){ | |
165 | AliFatal("Parameters missing"); | |
166 | return; // make coverity happy | |
167 | } | |
168 | ||
169 | Double_t xx[3]; | |
170 | // Apply Time0 correction - Pad by pad fluctuation | |
171 | // | |
172 | if (!calib->HasAlignmentOCDB()) x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad); | |
173 | // | |
174 | // Tranform from pad - time coordinate system to the rotated global (tracking) system | |
175 | // | |
176 | Local2RotatedGlobal(sector,x); | |
177 | // | |
178 | // | |
179 | // | |
180 | // Alignment | |
181 | //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx); | |
182 | RotatedGlobal2Global(sector,x); | |
183 | ||
184 | // | |
185 | // old ExB correction | |
186 | // | |
187 | if(fCurrentRecoParam->GetUseExBCorrection()) { | |
188 | ||
189 | calib->GetExB()->Correct(x,xx); | |
190 | ||
191 | } else { | |
192 | ||
193 | xx[0] = x[0]; | |
194 | xx[1] = x[1]; | |
195 | xx[2] = x[2]; | |
196 | } | |
197 | ||
198 | // | |
199 | // new composed correction - will replace soon ExB correction | |
200 | // | |
201 | if(fCurrentRecoParam->GetUseComposedCorrection()&&correction) { | |
202 | Float_t distPoint[3]={xx[0],xx[1],xx[2]}; | |
203 | correction->CorrectPoint(distPoint, sector); | |
204 | xx[0]=distPoint[0]; | |
205 | xx[1]=distPoint[1]; | |
206 | xx[2]=distPoint[2]; | |
207 | if (correctionDelta&&fCurrentRecoParam->GetUseAlignmentTime()){ // appply time dependent correction if available and enabled | |
208 | Float_t distPointDelta[3]={xx[0],xx[1],xx[2]}; | |
209 | correctionDelta->CorrectPoint(distPointDelta, sector); | |
210 | xx[0]=distPointDelta[0]; | |
211 | xx[1]=distPointDelta[1]; | |
212 | xx[2]=distPointDelta[2]; | |
213 | } | |
214 | } | |
215 | ||
216 | ||
217 | // | |
218 | // Time of flight correction | |
219 | // | |
220 | if (fCurrentRecoParam->GetUseTOFCorrection()){ | |
221 | const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector(); | |
222 | Float_t sign=1; | |
223 | if (sector < kNIS) { | |
224 | sign = (sector < kNIS/2) ? 1 : -1; | |
225 | } else { | |
226 | sign = ((sector-kNIS) < kNOS/2) ? 1 : -1; | |
227 | } | |
228 | Float_t deltaDr =0; | |
229 | Float_t dist=0; | |
230 | dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]); | |
231 | dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]); | |
232 | dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]); | |
233 | dist = TMath::Sqrt(dist); | |
234 | // drift length correction because of TOF | |
235 | // the drift velocity is in cm/s therefore multiplication by 0.01 | |
236 | deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C(); | |
237 | xx[2]+=sign*deltaDr; | |
238 | } | |
239 | // | |
240 | // | |
241 | // | |
242 | ||
243 | // | |
244 | Global2RotatedGlobal(sector,xx); | |
245 | ||
246 | // | |
247 | // Apply non linear distortion correction | |
248 | // | |
249 | if (distortionMapY ){ | |
250 | // wt - to get it form the OCDB | |
251 | // ignore T1 and T2 | |
252 | AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); | |
253 | Double_t bzField = magF->SolenoidField()/10.; //field in T | |
254 | Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally) | |
255 | Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully) | |
256 | if (sector%36<18) ezField*=-1; | |
257 | Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ; | |
258 | Double_t c0=1./(1.+wt*wt); | |
259 | Double_t c1=wt/c0; | |
260 | ||
261 | //can be switch on for each dimension separatelly | |
262 | if (fCurrentRecoParam->GetUseFieldCorrection()&0x2) | |
263 | if (distortionMapY){ | |
264 | xx[1]-= c0*distortionMapY->GetCalROC(sector)->GetValue(row,pad); | |
265 | xx[0]-= c1*distortionMapY->GetCalROC(sector)->GetValue(row,pad); | |
266 | } | |
267 | if (fCurrentRecoParam->GetUseFieldCorrection()&0x4) | |
268 | if (distortionMapZ) | |
269 | xx[2]-=distortionMapZ->GetCalROC(sector)->GetValue(row,pad); | |
270 | if (fCurrentRecoParam->GetUseFieldCorrection()&0x8) | |
271 | if (distortionMapR){ | |
272 | xx[0]-= c0*distortionMapR->GetCalROC(sector)->GetValue(row,pad); | |
273 | xx[1]-=-c1*distortionMapR->GetCalROC(sector)->GetValue(row,pad)*wt; | |
274 | } | |
275 | ||
276 | } | |
277 | // | |
278 | ||
279 | // | |
280 | x[0]=xx[0];x[1]=xx[1];x[2]=xx[2]; | |
281 | } | |
282 | ||
283 | void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const { | |
284 | // | |
285 | // | |
286 | // Tranform coordinate from | |
287 | // row, pad, time to x,y,z | |
288 | // | |
289 | // Drift Velocity | |
290 | // Current implementation - common drift velocity - for full chamber | |
291 | // TODO: use a map or parametrisation! | |
292 | // | |
293 | // | |
294 | // | |
295 | if (!fCurrentRecoParam) return; | |
296 | const Int_t kMax =60; // cache for 60 seconds | |
297 | static Int_t lastStamp=-1; //cached values | |
298 | static Double_t lastCorr = 1; | |
299 | // | |
300 | AliTPCcalibDB* calib=AliTPCcalibDB::Instance(); | |
301 | AliTPCParam * param = calib->GetParameters(); | |
302 | AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun); | |
303 | Double_t driftCorr = 1.; | |
304 | if (driftCalib){ | |
305 | // | |
306 | // caching drift correction - temp. fix | |
307 | // Extremally slow procedure | |
308 | if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){ | |
309 | driftCorr = lastCorr; | |
310 | }else{ | |
311 | driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5; | |
312 | lastCorr=driftCorr; | |
313 | lastStamp=fCurrentTimeStamp; | |
314 | ||
315 | } | |
316 | } | |
317 | // | |
318 | // simple caching non thread save | |
319 | static Double_t vdcorrectionTime=1; | |
320 | static Double_t vdcorrectionTimeGY=0; | |
321 | static Double_t time0corrTime=0; | |
322 | static Int_t lastStampT=-1; | |
323 | // | |
324 | if (lastStampT!=(Int_t)fCurrentTimeStamp){ | |
325 | lastStampT=fCurrentTimeStamp; | |
326 | if(fCurrentRecoParam->GetUseDriftCorrectionTime()>0) { | |
327 | vdcorrectionTime = (1+AliTPCcalibDB::Instance()-> | |
328 | GetVDriftCorrectionTime(fCurrentTimeStamp, | |
329 | fCurrentRun, | |
330 | sector%36>=18, | |
331 | fCurrentRecoParam->GetUseDriftCorrectionTime())); | |
332 | time0corrTime= AliTPCcalibDB::Instance()-> | |
333 | GetTime0CorrectionTime(fCurrentTimeStamp, | |
334 | fCurrentRun, | |
335 | sector%36>=18, | |
336 | fCurrentRecoParam->GetUseDriftCorrectionTime()); | |
337 | } | |
338 | // | |
339 | if(fCurrentRecoParam->GetUseDriftCorrectionGY()>0) { | |
340 | ||
341 | Double_t corrGy= AliTPCcalibDB::Instance()-> | |
342 | GetVDriftCorrectionGy(fCurrentTimeStamp, | |
343 | AliTPCcalibDB::Instance()->GetRun(), | |
344 | sector%36>=18, | |
345 | fCurrentRecoParam->GetUseDriftCorrectionGY()); | |
346 | vdcorrectionTimeGY = corrGy; | |
347 | } | |
348 | } | |
349 | ||
350 | ||
351 | if (!param){ | |
352 | AliFatal("Parameters missing"); | |
353 | return; // make coverity happy | |
354 | } | |
355 | Int_t row=TMath::Nint(x[0]); | |
356 | // Int_t pad=TMath::Nint(x[1]); | |
357 | // | |
358 | const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector(); | |
359 | Double_t sign = 1.; | |
360 | Double_t zwidth = param->GetZWidth()*driftCorr; | |
361 | Float_t xyzPad[3]; | |
362 | AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad); | |
363 | if (AliTPCRecoParam:: GetUseTimeCalibration()) zwidth*=vdcorrectionTime*(1+xyzPad[1]*vdcorrectionTimeGY); | |
364 | Double_t padWidth = 0; | |
365 | Double_t padLength = 0; | |
366 | Double_t maxPad = 0; | |
367 | // | |
368 | if (sector < kNIS) { | |
369 | maxPad = param->GetNPadsLow(row); | |
370 | sign = (sector < kNIS/2) ? 1 : -1; | |
371 | padLength = param->GetPadPitchLength(sector,row); | |
372 | padWidth = param->GetPadPitchWidth(sector); | |
373 | } else { | |
374 | maxPad = param->GetNPadsUp(row); | |
375 | sign = ((sector-kNIS) < kNOS/2) ? 1 : -1; | |
376 | padLength = param->GetPadPitchLength(sector,row); | |
377 | padWidth = param->GetPadPitchWidth(sector); | |
378 | } | |
379 | // | |
380 | // X coordinate | |
381 | x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal | |
382 | // | |
383 | // Y coordinate | |
384 | // | |
385 | x[1]=(x[1]-0.5*maxPad)*padWidth; | |
386 | // pads are mirrorred on C-side | |
387 | if (sector%36>17){ | |
388 | x[1]*=-1; | |
389 | } | |
390 | ||
391 | // | |
392 | ||
393 | // | |
394 | // Z coordinate | |
395 | // | |
396 | if (AliTPCcalibDB::Instance()->IsTrgL0()){ | |
397 | // by defualt we assume L1 trigger is used - make a correction in case of L0 | |
398 | AliCTPTimeParams* ctp = AliTPCcalibDB::Instance()->GetCTPTimeParams(); | |
399 | if (ctp){ | |
400 | //for TPC standalone runs no ctp info | |
401 | Double_t delay = ctp->GetDelayL1L0()*0.000000025; | |
402 | x[2]-=delay/param->GetTSample(); | |
403 | } | |
404 | } | |
405 | x[2]-= param->GetNTBinsL1(); | |
406 | x[2]*= zwidth; // tranform time bin to the distance to the ROC | |
407 | x[2]-= 3.*param->GetZSigma() + time0corrTime; | |
408 | // subtract the time offsets | |
409 | x[2] = sign*( param->GetZLength(sector) - x[2]); | |
410 | } | |
411 | ||
412 | void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const { | |
413 | // | |
414 | // transform possition rotated global to the global | |
415 | // | |
416 | Double_t cos,sin; | |
417 | GetCosAndSin(sector,cos,sin); | |
418 | Double_t tmp=x[0]; | |
419 | x[0]= cos*tmp-sin*x[1]; | |
420 | x[1]=+sin*tmp+cos*x[1]; | |
421 | } | |
422 | ||
423 | void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const { | |
424 | // | |
425 | // tranform possition Global2RotatedGlobal | |
426 | // | |
427 | Double_t cos,sin; | |
428 | GetCosAndSin(sector,cos,sin); | |
429 | Double_t tmp=x[0]; | |
430 | x[0]= cos*tmp+sin*x[1]; | |
431 | x[1]= -sin*tmp+cos*x[1]; | |
432 | } | |
433 | ||
434 | void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos, | |
435 | Double_t &sin) const { | |
436 | cos=fCoss[sector%18]; | |
437 | sin=fSins[sector%18]; | |
438 | } | |
439 | ||
440 | ||
441 | void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){ | |
442 | // | |
443 | // Modify global position | |
444 | // xyz - global xyz position | |
445 | // volID - volID of detector (sector number) | |
446 | // | |
447 | // | |
448 | ||
449 | } |