1 /**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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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 // AliTPCclustererMI::AddCluster
37 // AliTPCtrackerMI::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
144 Int_t row=TMath::Nint(x[0]);
145 Int_t pad=TMath::Nint(x[1]);
147 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
149 AliTPCCalPad * time0TPC = calib->GetPadTime0();
150 AliTPCCalPad * distortionMapY = calib->GetDistortionMap(0);
151 AliTPCCalPad * distortionMapZ = calib->GetDistortionMap(1);
152 AliTPCCalPad * distortionMapR = calib->GetDistortionMap(2);
153 AliTPCParam * param = calib->GetParameters();
154 AliTPCCorrection * correction = calib->GetTPCComposedCorrection(); // first user defined correction // if does not exist try to get it from calibDB array
155 if (!correction) correction = calib->GetTPCComposedCorrection(AliTracker::GetBz());
157 AliFatal("Time unisochronity missing");
161 AliFatal("Parameters missing");
165 // Apply Time0 correction - Pad by pad fluctuation
167 x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
169 // Tranform from pad - time coordinate system to the rotated global (tracking) system
171 Local2RotatedGlobal(sector,x);
176 //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
177 RotatedGlobal2Global(sector,x);
180 // old ExB correction
182 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseExBCorrection()) {
184 calib->GetExB()->Correct(x,xx);
194 // new composed correction - will replace soon ExB correction
196 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseComposedCorrection()&&correction) {
197 Float_t distPoint[3]={xx[0],xx[1],xx[2]};
198 correction->CorrectPoint(distPoint, sector);
206 // Time of flight correction
208 if (fCurrentRecoParam&&fCurrentRecoParam->GetUseTOFCorrection()){
209 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
212 sign = (sector < kNIS/2) ? 1 : -1;
214 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
218 dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]);
219 dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]);
220 dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]);
221 dist = TMath::Sqrt(dist);
222 // drift length correction because of TOF
223 // the drift velocity is in cm/s therefore multiplication by 0.01
224 deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C();
232 Global2RotatedGlobal(sector,xx);
235 // Apply non linear distortion correction
237 if (distortionMapY ){
238 // wt - to get it form the OCDB
240 AliMagF* magF= (AliMagF*)TGeoGlobalMagField::Instance()->GetField();
241 Double_t bzField = magF->SolenoidField()/10.; //field in T
242 Double_t vdrift = param->GetDriftV()/1000000.; // [cm/us] // From dataBase: to be updated: per second (ideally)
243 Double_t ezField = 400; // [V/cm] // to be updated: never (hopefully)
244 if (sector%36<18) ezField*=-1;
245 Double_t wt = -10.0 * (bzField*10) * vdrift / ezField ;
246 Double_t c0=1./(1.+wt*wt);
249 //can be switch on for each dimension separatelly
250 if (fCurrentRecoParam->GetUseFieldCorrection()&0x2)
252 xx[1]-= c0*distortionMapY->GetCalROC(sector)->GetValue(row,pad);
253 xx[0]-= c1*distortionMapY->GetCalROC(sector)->GetValue(row,pad);
255 if (fCurrentRecoParam->GetUseFieldCorrection()&0x4)
257 xx[2]-=distortionMapZ->GetCalROC(sector)->GetValue(row,pad);
258 if (fCurrentRecoParam->GetUseFieldCorrection()&0x8)
260 xx[0]-= c0*distortionMapR->GetCalROC(sector)->GetValue(row,pad);
261 xx[1]-=-c1*distortionMapR->GetCalROC(sector)->GetValue(row,pad)*wt;
268 x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
271 void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
274 // Tranform coordinate from
275 // row, pad, time to x,y,z
278 // Current implementation - common drift velocity - for full chamber
279 // TODO: use a map or parametrisation!
283 const Int_t kMax =60; // cache for 60 seconds
284 static Int_t lastStamp=-1; //cached values
285 static Double_t lastCorr = 1;
287 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
288 AliTPCParam * param = calib->GetParameters();
289 AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
290 Double_t driftCorr = 1.;
293 // caching drift correction - temp. fix
294 // Extremally slow procedure
295 if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
296 driftCorr = lastCorr;
298 driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
300 lastStamp=fCurrentTimeStamp;
305 // simple caching non thread save
306 static Double_t vdcorrectionTime=1;
307 static Double_t vdcorrectionTimeGY=0;
308 static Double_t time0corrTime=0;
309 static Int_t lastStampT=-1;
311 if (lastStampT!=(Int_t)fCurrentTimeStamp){
312 lastStampT=fCurrentTimeStamp;
313 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
314 vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
315 GetVDriftCorrectionTime(fCurrentTimeStamp,
318 fCurrentRecoParam->GetUseDriftCorrectionTime()));
319 time0corrTime= AliTPCcalibDB::Instance()->
320 GetTime0CorrectionTime(fCurrentTimeStamp,
323 fCurrentRecoParam->GetUseDriftCorrectionTime());
326 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
328 Double_t corrGy= AliTPCcalibDB::Instance()->
329 GetVDriftCorrectionGy(fCurrentTimeStamp,
330 AliTPCcalibDB::Instance()->GetRun(),
332 fCurrentRecoParam->GetUseDriftCorrectionGY());
333 vdcorrectionTimeGY = corrGy;
339 AliFatal("Parameters missing");
341 Int_t row=TMath::Nint(x[0]);
342 // Int_t pad=TMath::Nint(x[1]);
344 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
346 Double_t zwidth = param->GetZWidth()*driftCorr;
348 AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
349 if (AliTPCRecoParam:: GetUseTimeCalibration()) zwidth*=vdcorrectionTime*(1+xyzPad[1]*vdcorrectionTimeGY);
350 Double_t padWidth = 0;
351 Double_t padLength = 0;
355 maxPad = param->GetNPadsLow(row);
356 sign = (sector < kNIS/2) ? 1 : -1;
357 padLength = param->GetPadPitchLength(sector,row);
358 padWidth = param->GetPadPitchWidth(sector);
360 maxPad = param->GetNPadsUp(row);
361 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
362 padLength = param->GetPadPitchLength(sector,row);
363 padWidth = param->GetPadPitchWidth(sector);
367 x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
371 x[1]=(x[1]-0.5*maxPad)*padWidth;
372 // pads are mirrorred on C-side
382 if (AliTPCcalibDB::Instance()->IsTrgL0()){
383 // by defualt we assume L1 trigger is used - make a correction in case of L0
384 AliCTPTimeParams* ctp = AliTPCcalibDB::Instance()->GetCTPTimeParams();
386 //for TPC standalone runs no ctp info
387 Double_t delay = ctp->GetDelayL1L0()*0.000000025;
388 x[2]-=delay/param->GetTSample();
391 x[2]-= param->GetNTBinsL1();
392 x[2]*= zwidth; // tranform time bin to the distance to the ROC
393 x[2]-= 3.*param->GetZSigma() + time0corrTime;
394 // subtract the time offsets
395 x[2] = sign*( param->GetZLength(sector) - x[2]);
398 void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
400 // transform possition rotated global to the global
403 GetCosAndSin(sector,cos,sin);
405 x[0]= cos*tmp-sin*x[1];
406 x[1]=+sin*tmp+cos*x[1];
409 void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
411 // tranform possition Global2RotatedGlobal
414 GetCosAndSin(sector,cos,sin);
416 x[0]= cos*tmp+sin*x[1];
417 x[1]= -sin*tmp+cos*x[1];
420 void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
421 Double_t &sin) const {
422 cos=fCoss[sector%18];
423 sin=fSins[sector%18];
427 void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){
429 // Modify global position
430 // xyz - global xyz position
431 // volID - volID of detector (sector number)