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. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //-------------------------------------------------------
17 // Implementation of the TPC transformation class
19 // Origin: Marian Ivanov Marian.Ivanov@cern.ch
22 // Class for tranformation of the coordinate frame
24 // local coordinate frame (sector, padrow, pad, timebine) ==>
25 // rotated global (tracking) cooridnate frame (sector, lx,ly,lz)
27 // Unisochronity - (substract time0 - pad by pad)
28 // Drift velocity - Currently common drift velocity - functionality of AliTPCParam
31 // Time of flight correction -
32 // - Depends on the vertex position
36 // AliTPCclusterer::AddCluster
37 // AliTPCtracker::Transform
39 //-------------------------------------------------------
42 cdb=AliCDBManager::Instance()
43 cdb->SetDefaultStorage("local:///u/mmager/mycalib1")
44 c=AliTPCcalibDB::Instance()
46 Double_t x[]={1.0,2.0,3.0}
49 trafo.Transform(x,i,0,1)
54 #include "AliTPCROC.h"
55 #include "AliTPCCalPad.h"
56 #include "AliTPCCalROC.h"
57 #include "AliTPCcalibDB.h"
58 #include "AliTPCParam.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"
68 #include "TGeoGlobalMagField.h"
69 #include "AliTracker.h"
70 #include <AliCTPTimeParams.h>
72 ClassImp(AliTPCTransform)
75 AliTPCTransform::AliTPCTransform():
77 fCurrentRecoParam(0), //! current reconstruction parameters
78 fCurrentRun(0), //! current run
79 fCurrentTimeStamp(0) //! current time stamp
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);
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
100 // Speed it up a bit!
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);
112 AliTPCTransform::~AliTPCTransform() {
118 void AliTPCTransform::SetPrimVertex(Double_t *vtx){
128 void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/,
129 Int_t /*coordinateType*/) {
130 // input: x[0] - pad row
134 // output: x[0] - x (all in the rotated global coordinate frame)
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
143 if (!fCurrentRecoParam) {
146 Int_t row=TMath::Nint(x[0]);
147 Int_t pad=TMath::Nint(x[1]);
149 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
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());
159 AliFatal("Time unisochronity missing");
160 return ; // make coverity happy
162 AliTPCCorrection * correctionDelta = calib->GetTPCComposedCorrectionDelta();
165 AliFatal("Parameters missing");
166 return; // make coverity happy
170 // Apply Time0 correction - Pad by pad fluctuation
172 if (!calib->HasAlignmentOCDB()) x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
174 // Tranform from pad - time coordinate system to the rotated global (tracking) system
176 Local2RotatedGlobal(sector,x);
181 //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
182 RotatedGlobal2Global(sector,x);
185 // old ExB correction
187 if(fCurrentRecoParam->GetUseExBCorrection()) {
189 calib->GetExB()->Correct(x,xx);
199 // new composed correction - will replace soon ExB correction
201 if(fCurrentRecoParam->GetUseComposedCorrection()&&correction) {
202 Float_t distPoint[3]={static_cast<Float_t>(xx[0]),static_cast<Float_t>(xx[1]),static_cast<Float_t>(xx[2])};
203 correction->CorrectPoint(distPoint, sector);
207 if (correctionDelta&&fCurrentRecoParam->GetUseAlignmentTime()){ // appply time dependent correction if available and enabled
208 Float_t distPointDelta[3]={static_cast<Float_t>(xx[0]),static_cast<Float_t>(xx[1]),static_cast<Float_t>(xx[2])};
209 correctionDelta->CorrectPoint(distPointDelta, sector);
210 xx[0]=distPointDelta[0];
211 xx[1]=distPointDelta[1];
212 xx[2]=distPointDelta[2];
218 // Time of flight correction
220 if (fCurrentRecoParam->GetUseTOFCorrection()){
221 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
224 sign = (sector < kNIS/2) ? 1 : -1;
226 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
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();
244 Global2RotatedGlobal(sector,xx);
247 // Apply non linear distortion correction
249 if (distortionMapY ){
250 // wt - to get it form the OCDB
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);
261 //can be switch on for each dimension separatelly
262 if (fCurrentRecoParam->GetUseFieldCorrection()&0x2)
264 xx[1]-= c0*distortionMapY->GetCalROC(sector)->GetValue(row,pad);
265 xx[0]-= c1*distortionMapY->GetCalROC(sector)->GetValue(row,pad);
267 if (fCurrentRecoParam->GetUseFieldCorrection()&0x4)
269 xx[2]-=distortionMapZ->GetCalROC(sector)->GetValue(row,pad);
270 if (fCurrentRecoParam->GetUseFieldCorrection()&0x8)
272 xx[0]-= c0*distortionMapR->GetCalROC(sector)->GetValue(row,pad);
273 xx[1]-=-c1*distortionMapR->GetCalROC(sector)->GetValue(row,pad)*wt;
280 x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
283 void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
286 // Tranform coordinate from
287 // row, pad, time to x,y,z
290 // Current implementation - common drift velocity - for full chamber
291 // TODO: use a map or parametrisation!
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;
300 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
301 AliTPCParam * param = calib->GetParameters();
302 AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
303 Double_t driftCorr = 1.;
306 // caching drift correction - temp. fix
307 // Extremally slow procedure
308 if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
309 driftCorr = lastCorr;
311 driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
313 lastStamp=fCurrentTimeStamp;
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 Double_t deltaZcorrTime=0;
323 static Int_t lastStampT=-1;
325 if (lastStampT!=(Int_t)fCurrentTimeStamp){
326 lastStampT=fCurrentTimeStamp;
327 if(fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
328 vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
329 GetVDriftCorrectionTime(fCurrentTimeStamp,
332 fCurrentRecoParam->GetUseDriftCorrectionTime()));
333 time0corrTime= AliTPCcalibDB::Instance()->
334 GetTime0CorrectionTime(fCurrentTimeStamp,
337 fCurrentRecoParam->GetUseDriftCorrectionTime());
339 deltaZcorrTime= AliTPCcalibDB::Instance()->
340 GetVDriftCorrectionDeltaZ(fCurrentTimeStamp,
347 if(fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
349 Double_t corrGy= AliTPCcalibDB::Instance()->
350 GetVDriftCorrectionGy(fCurrentTimeStamp,
351 AliTPCcalibDB::Instance()->GetRun(),
353 fCurrentRecoParam->GetUseDriftCorrectionGY());
354 vdcorrectionTimeGY = corrGy;
360 AliFatal("Parameters missing");
361 return; // make coverity happy
363 Int_t row=TMath::Nint(x[0]);
364 // Int_t pad=TMath::Nint(x[1]);
366 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
368 Double_t zwidth = param->GetZWidth()*driftCorr;
370 AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
371 if (AliTPCRecoParam:: GetUseTimeCalibration()) zwidth*=vdcorrectionTime*(1+xyzPad[1]*vdcorrectionTimeGY);
372 Double_t padWidth = 0;
373 Double_t padLength = 0;
377 maxPad = param->GetNPadsLow(row);
378 sign = (sector < kNIS/2) ? 1 : -1;
379 padLength = param->GetPadPitchLength(sector,row);
380 padWidth = param->GetPadPitchWidth(sector);
382 maxPad = param->GetNPadsUp(row);
383 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
384 padLength = param->GetPadPitchLength(sector,row);
385 padWidth = param->GetPadPitchWidth(sector);
389 x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
393 x[1]=(x[1]-0.5*maxPad)*padWidth;
394 // pads are mirrorred on C-side
404 if (AliTPCcalibDB::Instance()->IsTrgL0()){
405 // by defualt we assume L1 trigger is used - make a correction in case of L0
406 AliCTPTimeParams* ctp = AliTPCcalibDB::Instance()->GetCTPTimeParams();
408 //for TPC standalone runs no ctp info
409 Double_t delay = ctp->GetDelayL1L0()*0.000000025;
410 x[2]-=delay/param->GetTSample();
413 x[2]-= param->GetNTBinsL1();
414 x[2]*= zwidth; // tranform time bin to the distance to the ROC
415 x[2]-= 3.*param->GetZSigma() + time0corrTime;
416 // subtract the time offsets
417 x[2] = sign*( param->GetZLength(sector) - x[2]);
418 x[2]-=deltaZcorrTime; // subtrack time dependent z shift (calibrated together with the drift velocity and T0)
421 void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
423 // transform possition rotated global to the global
426 GetCosAndSin(sector,cos,sin);
428 x[0]= cos*tmp-sin*x[1];
429 x[1]=+sin*tmp+cos*x[1];
432 void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
434 // tranform possition Global2RotatedGlobal
437 GetCosAndSin(sector,cos,sin);
439 x[0]= cos*tmp+sin*x[1];
440 x[1]= -sin*tmp+cos*x[1];
443 void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
444 Double_t &sin) const {
445 cos=fCoss[sector%18];
446 sin=fSins[sector%18];
450 void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){
452 // Modify global position
453 // xyz - global xyz position
454 // volID - volID of detector (sector number)