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 // 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 "TGeoMatrix.h"
63 #include "AliTPCRecoParam.h"
64 #include "AliTPCCalibVdrift.h"
65 #include "AliTPCTransform.h"
66 #include <AliCTPTimeParams.h>
68 ClassImp(AliTPCTransform)
71 AliTPCTransform::AliTPCTransform():
73 fCurrentRecoParam(0), //! current reconstruction parameters
74 fCurrentRun(0), //! current run
75 fCurrentTimeStamp(0) //! current time stamp
80 for (Int_t i=0;i<18;++i) {
81 Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
82 fSins[i]=TMath::Sin(alpha);
83 fCoss[i]=TMath::Cos(alpha);
89 AliTPCTransform::AliTPCTransform(const AliTPCTransform& transform):
90 AliTransform(transform),
91 fCurrentRecoParam(transform.fCurrentRecoParam), //! current reconstruction parameters
92 fCurrentRun(transform.fCurrentRun), //! current run
93 fCurrentTimeStamp(transform.fCurrentTimeStamp) //! current time stamp
98 for (Int_t i=0;i<18;++i) {
99 Double_t alpha=TMath::DegToRad()*(10.+20.*(i%18));
100 fSins[i]=TMath::Sin(alpha);
101 fCoss[i]=TMath::Cos(alpha);
108 AliTPCTransform::~AliTPCTransform() {
114 void AliTPCTransform::SetPrimVertex(Double_t *vtx){
124 void AliTPCTransform::Transform(Double_t *x,Int_t *i,UInt_t /*time*/,
125 Int_t /*coordinateType*/) {
126 // input: x[0] - pad row
130 // output: x[0] - x (all in the rotated global coordinate frame)
134 // primvtx - position of the primary vertex
135 // used for the TOF correction
136 // TOF of particle calculated assuming the speed-of-light and
137 // line approximation
140 Int_t row=TMath::Nint(x[0]);
141 Int_t pad=TMath::Nint(x[1]);
143 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
145 AliTPCCalPad * time0TPC = calib->GetPadTime0();
146 AliTPCParam * param = calib->GetParameters();
148 AliFatal("Time unisochronity missing");
152 AliFatal("Parameters missing");
156 // Apply Time0 correction - Pad by pad fluctuation
158 x[2]-=time0TPC->GetCalROC(sector)->GetValue(row,pad);
160 // Tranform from pad - time coordinate system to the rotated global (tracking) system
162 Local2RotatedGlobal(sector,x);
167 //TODO: calib->GetParameters()->GetClusterMatrix(sector)->LocalToMaster(x,xx);
168 RotatedGlobal2Global(sector,x);
173 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseExBCorrection()) {
175 calib->GetExB()->Correct(x,xx);
185 // Time of flight correction
187 if (fCurrentRecoParam&&fCurrentRecoParam->GetUseTOFCorrection()){
188 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
191 sign = (sector < kNIS/2) ? 1 : -1;
193 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
197 dist+=(fPrimVtx[0]-x[0])*(fPrimVtx[0]-x[0]);
198 dist+=(fPrimVtx[1]-x[1])*(fPrimVtx[1]-x[1]);
199 dist+=(fPrimVtx[2]-x[2])*(fPrimVtx[2]-x[2]);
200 dist = TMath::Sqrt(dist);
201 // drift length correction because of TOF
202 // the drift velocity is in cm/s therefore multiplication by 0.01
203 deltaDr = (dist*(0.01*param->GetDriftV()))/TMath::C();
211 Global2RotatedGlobal(sector,xx);
213 x[0]=xx[0];x[1]=xx[1];x[2]=xx[2];
216 void AliTPCTransform::Local2RotatedGlobal(Int_t sector, Double_t *x) const {
219 // Tranform coordinate from
220 // row, pad, time to x,y,z
223 // Current implementation - common drift velocity - for full chamber
224 // TODO: use a map or parametrisation!
228 const Int_t kMax =60; // cache for 60 seconds
229 static Int_t lastStamp=-1; //cached values
230 static Double_t lastCorr = 1;
232 AliTPCcalibDB* calib=AliTPCcalibDB::Instance();
233 AliTPCParam * param = calib->GetParameters();
234 AliTPCCalibVdrift *driftCalib = AliTPCcalibDB::Instance()->GetVdrift(fCurrentRun);
235 Double_t driftCorr = 1.;
238 // caching drift correction - temp. fix
239 // Extremally slow procedure
240 if ( TMath::Abs((lastStamp)-Int_t(fCurrentTimeStamp))<kMax){
241 driftCorr = lastCorr;
243 driftCorr = 1.+(driftCalib->GetPTRelative(fCurrentTimeStamp,0)+ driftCalib->GetPTRelative(fCurrentTimeStamp,1))*0.5;
245 lastStamp=fCurrentTimeStamp;
250 // simple caching non thread save
251 static Double_t vdcorrectionTime=1;
252 static Double_t time0corrTime=0;
253 static Int_t lastStampT=-1;
255 if (lastStampT!=(Int_t)fCurrentTimeStamp){
256 lastStampT=fCurrentTimeStamp;
257 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionTime()>0) {
258 vdcorrectionTime = (1+AliTPCcalibDB::Instance()->
259 GetVDriftCorrectionTime(fCurrentTimeStamp,
262 fCurrentRecoParam->GetUseDriftCorrectionTime()));
263 time0corrTime= AliTPCcalibDB::Instance()->
264 GetTime0CorrectionTime(fCurrentTimeStamp,
267 fCurrentRecoParam->GetUseDriftCorrectionTime());
270 if(fCurrentRecoParam&&fCurrentRecoParam->GetUseDriftCorrectionGY()>0) {
272 AliTPCROC::Instance()->GetPositionGlobal(sector, TMath::Nint(x[0]) ,TMath::Nint(x[1]), xyzPad);
274 Double_t corrGy= (1+(xyzPad[1])*AliTPCcalibDB::Instance()->
275 GetVDriftCorrectionGy(fCurrentTimeStamp,
276 AliTPCcalibDB::Instance()->GetRun(),
278 fCurrentRecoParam->GetUseDriftCorrectionGY()));
279 vdcorrectionTime *=corrGy;
285 AliFatal("Parameters missing");
287 Int_t row=TMath::Nint(x[0]);
288 // Int_t pad=TMath::Nint(x[1]);
290 const Int_t kNIS=param->GetNInnerSector(), kNOS=param->GetNOuterSector();
292 Double_t zwidth = param->GetZWidth()*driftCorr*vdcorrectionTime;
293 Double_t padWidth = 0;
294 Double_t padLength = 0;
298 maxPad = param->GetNPadsLow(row);
299 sign = (sector < kNIS/2) ? 1 : -1;
300 padLength = param->GetPadPitchLength(sector,row);
301 padWidth = param->GetPadPitchWidth(sector);
303 maxPad = param->GetNPadsUp(row);
304 sign = ((sector-kNIS) < kNOS/2) ? 1 : -1;
305 padLength = param->GetPadPitchLength(sector,row);
306 padWidth = param->GetPadPitchWidth(sector);
310 x[0] = param->GetPadRowRadii(sector,row); // padrow X position - ideal
314 x[1]=(x[1]-0.5*maxPad)*padWidth;
315 // pads are mirrorred on C-side
325 if (AliTPCcalibDB::Instance()->IsTrgL0()){
326 // by defualt we assume L1 trigger is used - make a correction in case of L0
327 AliCTPTimeParams* ctp = AliTPCcalibDB::Instance()->GetCTPTimeParams();
328 Double_t delay = ctp->GetDelayL1L0()*0.000000025;
329 x[2]-=delay/param->GetTSample();
331 x[2]-= param->GetNTBinsL1();
332 x[2]*= zwidth; // tranform time bin to the distance to the ROC
333 x[2]-= 3.*param->GetZSigma() + time0corrTime;
334 // subtract the time offsets
335 x[2] = sign*( param->GetZLength(sector) - x[2]);
338 void AliTPCTransform::RotatedGlobal2Global(Int_t sector,Double_t *x) const {
340 // transform possition rotated global to the global
343 GetCosAndSin(sector,cos,sin);
345 x[0]= cos*tmp-sin*x[1];
346 x[1]=+sin*tmp+cos*x[1];
349 void AliTPCTransform::Global2RotatedGlobal(Int_t sector,Double_t *x) const {
351 // tranform possition Global2RotatedGlobal
354 GetCosAndSin(sector,cos,sin);
356 x[0]= cos*tmp+sin*x[1];
357 x[1]= -sin*tmp+cos*x[1];
360 void AliTPCTransform::GetCosAndSin(Int_t sector,Double_t &cos,
361 Double_t &sin) const {
362 cos=fCoss[sector%18];
363 sin=fSins[sector%18];
367 void AliTPCTransform::ApplyTransformations(Double_t */*xyz*/, Int_t /*volID*/){
369 // Modify global position
370 // xyz - global xyz position
371 // volID - volID of detector (sector number)