4 #include <TDatabasePDG.h>
7 #include <TGeoGlobalMagField.h>
9 #include <TObjString.h>
12 #include <TObjArray.h>
13 #include <TLinearFitter.h>
16 #include <AliTPCROC.h>
17 #include <AliTrackPointArray.h>
18 #include <AliTrackerBase.h>
19 #include <AliCDBManager.h>
20 #include <AliTPCParam.h>
21 #include <AliGeomManager.h>
22 #include <AliTPCcalibDB.h>
23 #include <AliTPCclusterMI.h>
24 #include <AliTPCSpaceCharge3D.h>
25 #include <AliTPCROC.h>
26 #include <AliExternalTrackParam.h>
28 #include "AliToyMCEvent.h"
29 #include "AliToyMCTrack.h"
31 #include "AliToyMCEventGenerator.h"
33 ClassImp(AliToyMCEventGenerator);
36 AliToyMCEventGenerator::AliToyMCEventGenerator()
42 ,fTPCCorrectionAv(0x0)
45 ,fCorrectionFile("$ALICE_ROOT/TPC/Calib/maps/SC_NeCO2_eps5_50kHz_precal.lookup.root")
46 ,fOutputFileName("toyMC.root")
49 ,fUseStepCorrection(kFALSE)
50 ,fUseMaterialBudget(kFALSE)
52 ,fPrereadSCList(kFALSE)
54 fTPCParam = AliTPCcalibDB::Instance()->GetParameters();
55 fTPCParam->ReadGeoMatrices();
58 //________________________________________________________________
59 AliToyMCEventGenerator::AliToyMCEventGenerator(const AliToyMCEventGenerator &gen)
61 ,fTPCParam(gen.fTPCParam)
64 ,fTPCCorrection(gen.fTPCCorrection)
65 ,fTPCCorrectionAv(0x0)
67 ,fSCListFile(gen.fSCListFile)
68 ,fCorrectionFile(gen.fCorrectionFile)
69 ,fOutputFileName(gen.fOutputFileName)
72 ,fUseStepCorrection(gen.fUseStepCorrection)
73 ,fUseMaterialBudget(gen.fUseMaterialBudget)
74 ,fIsLaser(gen.fIsLaser)
75 ,fPrereadSCList(gen.fPrereadSCList)
80 //________________________________________________________________
81 AliToyMCEventGenerator::~AliToyMCEventGenerator()
83 if (HasSCList() &&!fPrereadSCList) delete fTPCCorrection;
87 //________________________________________________________________
88 Bool_t AliToyMCEventGenerator::DistortTrack(AliToyMCTrack &trackIn, Double_t t0)
95 fTPCParam = AliTPCcalibDB::Instance()->GetParameters();
96 fTPCParam->ReadGeoMatrices();
99 MakeITSClusters(trackIn/*,t0*/);
100 MakeTPCClusters(trackIn, t0);
101 MakeTRDClusters(trackIn/*,t0*/);
105 //________________________________________________________________
106 void AliToyMCEventGenerator::MakeITSClusters(AliToyMCTrack &trackIn/*, Double_t t0*/)
108 //Upgrade ITS parameters
109 const Int_t nITSLayers = 7;
110 const Double_t ITSRadii[nITSLayers] = {2.2, 2.8, 3.6, 20.0, 22.0, 41.0, 43.0};
111 const Double_t lengthITS[nITSLayers] = {22.4, 24.2, 26.8, 78.0, 83.6, 142.4, 148.6};
113 //resolution of the point is 10um
114 const Float_t sigmaY = 0.001;
115 const Float_t sigmaZ = 0.001;
119 const Double_t kMaxSnp = 0.85;
120 // const Double_t kMaxZ0 = fTPCParam->GetZLength();
121 const Double_t kMass = TDatabasePDG::Instance()->GetParticle("pi+")->Mass();
123 AliExternalTrackParam track(trackIn);
124 Double_t xyz[3] = {0.,0.,0.};
126 if (!AliTrackerBase::PropagateTrackTo(&track,ITSRadii[0],kMass,5,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget)) {
127 AliError(Form("Propagation to %.2f failed\n",ITSRadii[0]));
131 for(Int_t iLayer = 0; iLayer<nITSLayers; iLayer++){
133 if (!AliTrackerBase::PropagateTrackTo(&track,ITSRadii[iLayer],kMass,1,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget)) {
134 AliError(Form("Propagation to %.2f failed\n",ITSRadii[iLayer]));
137 // since I don't know how to extract the volumeid of the ITS layers I use the following strategy:
138 // - rotate the track to the next integer angle
139 // - use coordinates there and set as volumeid the integer angle
140 // - in the reco one can then rotate the cluster to the global frame using the angle stored in the volume id
143 // if (TMath::Abs(track.GetZ())>kMaxZ0) continue;
144 if (TMath::Abs(track.GetZ())>lengthITS[iLayer]/2) continue;
147 // smear the ideal positions with the cluster resolution
148 xyz[1]+=gRandom->Gaus(0,sigmaY);
149 xyz[2]+=gRandom->Gaus(0,sigmaZ);
151 Float_t xyzf[3]={xyz[0],xyz[1],xyz[2]};
153 SetPoint(xyzf,sigmaY,sigmaZ,point);
155 trackIn.AddITSPoint(point)->SetUniqueID(trackIn.GetUniqueID());
159 //________________________________________________________________
160 void AliToyMCEventGenerator::MakeTRDClusters(AliToyMCTrack &trackIn/*, Double_t t0*/)
163 //Uses current TRD parameters
164 const Int_t nTRDLayers = 6;
165 const Double_t distToMid = 3.2 + 30./2; //dist to middle of drift region (radiator + half drift region)
166 const Double_t TRDRadii[nTRDLayers] = {294.5 + distToMid, 307.1 + distToMid, 319.7 + distToMid, 332.3 + distToMid, 344.9 + distToMid, 357.5 + distToMid};
167 const Double_t lengthTRD[nTRDLayers] = {604.0, 634.0, 656.0, 686.0, 700.0, 700.0};
169 const Float_t sigmaY = 0.06;
170 const Float_t sigmaZ = 0.2;
174 const Double_t kMaxSnp = 0.85;
175 const Double_t kMaxZ0 = fTPCParam->GetZLength();
176 const Double_t kMass = TDatabasePDG::Instance()->GetParticle("pi+")->Mass();
178 AliExternalTrackParam track(trackIn);
179 Double_t xyz[3] = {0.,0.,0.};
181 if (!AliTrackerBase::PropagateTrackTo(&track,TRDRadii[0],kMass,5,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget)) {
182 AliError(Form("Propagation to %.2f failed\n",TRDRadii[0]));
186 for(Int_t iLayer = 0; iLayer<nTRDLayers; iLayer++){
188 if (!AliTrackerBase::PropagateTrackTo(&track,TRDRadii[iLayer],kMass,1,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget)) {
189 AliError(Form("Propagation to %.2f failed\n",TRDRadii[iLayer]));
194 if (TMath::Abs(track.GetZ())>kMaxZ0) continue;
195 if (TMath::Abs(track.GetZ())>lengthTRD[iLayer]/2) continue;
198 // smear the ideal positions with the cluster resolution
199 xyz[1]+=gRandom->Gaus(0,sigmaY);
200 xyz[2]+=gRandom->Gaus(0,sigmaZ);
202 Float_t xyzf[3]={xyz[0],xyz[1],xyz[2]};
204 SetPoint(xyzf,sigmaY,sigmaZ,point);
206 trackIn.AddTRDPoint(point)->SetUniqueID(trackIn.GetUniqueID());
210 //________________________________________________________________
211 void AliToyMCEventGenerator::MakeTPCClusters(AliToyMCTrack &trackIn, Double_t t0)
214 // make it big enough to hold all points
215 // store real number of generated points in the unique id
216 const Int_t nMaxPoints=3000;
217 static AliTrackPointArray pointArray0(nMaxPoints); //undistorted
218 static AliTrackPointArray pointArray1(nMaxPoints); //distorted
220 //Create space point of undistorted and distorted clusters along the propagated track trajectory
221 CreateSpacePoints(trackIn,pointArray0,pointArray1);
222 //Convert the space points into clusters in the local frame
223 //for undistorted and distorted clusters using the same function
224 ConvertTrackPointsToLocalClusters(pointArray0,trackIn,t0,0);
225 ConvertTrackPointsToLocalClusters(pointArray1,trackIn,t0,1);
229 //________________________________________________________________
230 void AliToyMCEventGenerator::CreateSpacePoints(AliToyMCTrack &trackIn,
231 AliTrackPointArray &arrUdist,
232 AliTrackPointArray &arrDist)
235 // sample the track from the inner to the outer wall of the TPC
236 // a graph is filled in local coordinates for later
239 Double_t kMaxSnp = 0.85;
240 if (fIsLaser) kMaxSnp=0.99;
241 const Double_t kMaxZ0 = fTPCParam->GetZLength();
242 const Double_t kMass = TDatabasePDG::Instance()->GetParticle("pi+")->Mass();
244 const Double_t iFCRadius = 83.5; //radius constants found in AliTPCCorrection.cxx
245 const Double_t oFCRadius = 254.5;
247 const Float_t kSigmaY=0.1;
248 const Float_t kSigmaZ=0.1;
250 AliExternalTrackParam track(trackIn);
251 //!!! TODO: make this adjustable perhaps
252 const Double_t stepSize=0.1;
253 Double_t xyz[3] = {0.,0.,0.};
254 Float_t xyzf[3] = {0.,0.,0.};
256 //!!! when does the propagation not work, how often does it happen?
257 if (!AliTrackerBase::PropagateTrackTo(&track,iFCRadius,kMass,5,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget) && !fIsLaser) {
258 AliError(Form("Propagation to IFC: %.2f failed\n",iFCRadius));
264 for (Double_t radius=iFCRadius; radius<oFCRadius; radius+=stepSize){
265 //!!! changed from return 0 to continue -> Please check
266 if (!AliTrackerBase::PropagateTrackTo(&track,radius,kMass,1,kTRUE,kMaxSnp,0,kFALSE,fUseMaterialBudget)) {
267 AliError(Form("Propagation to r=%.2f (snp=%.2f) failed\n",radius,track.GetSnp()));
272 //!!! Why is this smeared
274 xyzf[0]=Float_t(xyz[0]);
275 xyzf[1]=Float_t(xyz[1]);
276 xyzf[2]=Float_t(xyz[2]);
278 if (TMath::Abs(track.GetZ())>kMaxZ0) continue;
279 // if (TMath::Abs(track.GetX())<iFCRadius) continue;
280 // if (TMath::Abs(track.GetX())>oFCRadius) continue;
283 AliTrackPoint pUdist; // undistorted space point
284 AliTrackPoint pDist; // distorted space point
285 // Set undistorted point
286 SetPoint(xyzf,kSigmaY,kSigmaZ,pUdist);
287 arrUdist.AddPoint(npoints, &pUdist);
288 Int_t sector=pUdist.GetVolumeID();
290 // set distorted point
291 Float_t distPoint[3]={xyz[0],xyz[1],xyz[2]};
292 Float_t dxyz[3]={0.,0.,0.};
293 if (!fUseStepCorrection){
294 fTPCCorrection->DistortPoint(distPoint, sector);
296 fTPCCorrection->GetCorrectionIntegralDz(distPoint,sector,dxyz,5);
297 distPoint[0]-=dxyz[0];
298 distPoint[1]-=dxyz[1];
299 distPoint[2]-=dxyz[2];
301 SetPoint(distPoint,kSigmaY,kSigmaZ,pDist);
302 arrDist.AddPoint(npoints, &pDist);
307 arrUdist.SetUniqueID(npoints);
308 arrDist.SetUniqueID(npoints);
311 //________________________________________________________________
312 void AliToyMCEventGenerator::SetPoint(Float_t xyz[3], Float_t sigmaY, Float_t sigmaZ, AliTrackPoint &point)
315 // make AliTrackPoint out of AliTPCclusterMI
318 //covariance at the local frame
319 //assume 1mm distortion in y and z
321 Float_t cov[6]={0,0,0, sigmaY*sigmaY,0,sigmaZ*sigmaZ};
323 const Float_t alpha = -TMath::ATan2(xyz[1],xyz[0]);
324 const Float_t sin = TMath::Sin(alpha), cos = TMath::Cos(alpha);
327 newcov[0] = cov[0]*cos*cos + 2*cov[1]*sin*cos + cov[3]*sin*sin;
328 newcov[1] = cov[1]*(cos*cos-sin*sin) + (cov[3]-cov[0])*sin*cos;
329 newcov[2] = cov[2]*cos + cov[4]*sin;
330 newcov[3] = cov[0]*sin*sin - 2*cov[1]*sin*cos + cov[3]*cos*cos;
331 newcov[4] = cov[4]*cos - cov[2]*sin;
334 // voluem ID to add later ....
336 point.SetCov(newcov);
337 // abuse volume ID for the sector number
338 point.SetVolumeID(fTPCParam->Transform0to1(xyz,i));
340 // TODO: Add sampled dE/dx (use SetCharge)
343 //________________________________________________________________
344 void AliToyMCEventGenerator::ConvertTrackPointsToLocalClusters(AliTrackPointArray &arrPoints,
345 AliToyMCTrack &tr, Double_t t0, Int_t type)
351 const Int_t npoints=Int_t(arrPoints.GetUniqueID());
354 // create an array for graphs which are used for local interpolation
355 // we need a new graph if the sector changed since then the local frame will also change
356 TObjArray arrGraphsXY(72);
357 arrGraphsXY.SetOwner();
358 TObjArray arrGraphsXZ(72);
359 arrGraphsXZ.SetOwner();
361 //create initial graph
364 //row -> sector mapping
366 for (Int_t irow=0; irow<159; ++irow) rowMap[irow]=-1;
369 // Make from the list of global space points graphs in the local frame
370 // one graph per sector is needed
371 for (Int_t ipoint=0; ipoint<npoints; ++ipoint){
372 arrPoints.GetPoint(p,ipoint);
373 Float_t xyz[3] = {p.GetX(),p.GetY(),p.GetZ()};
374 Int_t index[3] = {0,0,0};
375 Int_t row = fTPCParam->GetPadRow(xyz,index);
376 // rotate space point to local frame
377 // the angle is given by the VolumeID which was set in CrateSpacePoints
378 const Int_t sec=p.GetVolumeID();
379 if (row<0 || (sec<36 && row>62) || row>95 ) continue;
380 Double_t angle=((sec%18)*20.+10.)/TMath::RadToDeg();
381 AliTrackPoint pRot=p.Rotate(angle);
382 const Int_t secrow=row+(sec>35)*63;
383 if (rowMap[secrow]==-1) rowMap[secrow]=sec;
384 // check if we need a new graph (sector change)
388 arrGraphsXY.AddAt(grXY,sec);
389 arrGraphsXZ.AddAt(grXZ,sec);
392 //add coordinates in local frame for later interpolation
393 grXY->SetPoint(grXY->GetN(), pRot.GetX(), pRot.GetY());
394 grXZ->SetPoint(grXZ->GetN(), pRot.GetX(), pRot.GetZ());
399 // create in the center of each row a space point by using the graph to interpolate
400 // the the center of the row. This is done in xy and xz
403 AliTPCclusterMI tempCl;
405 for (Int_t irow=0; irow<159; ++irow ){
406 const Int_t sec = rowMap[irow];
407 if (sec==-1) continue;
408 const Int_t secrow = irow<63?irow:irow-63;
409 Double_t localX = fTPCParam->GetPadRowRadii(sec,secrow);
410 // get graph for the current row
417 grXY=(TGraph*)arrGraphsXY.At(sec);
418 grXZ=(TGraph*)arrGraphsXZ.At(sec);
421 // if(grXY->GetN()>1 && grXZ->GetN()>1) { //causes segmentation violation if N==1
422 // splXY=new TSpline3("splXY",grXY);
423 // splXZ=new TSpline3("splXZ",grXZ);
426 //TODO: make a cluster also in the sector w only one space point?
428 // Double_t tempX=0., tempY = 0., tempZ = 0.;
430 // grXY->GetPoint(0,tempX,localY);
431 // grXZ->GetPoint(0,tempX,localZ);
437 // check we are in an active area
438 // if (splXY->FindX(localX)<1 || splXZ->FindX(localX)<1) continue;
439 if ( localX<grXY->GetX()[0] || localX>grXY->GetX()[grXY->GetN()-1] || localX<grXZ->GetX()[0] || localX>grXZ->GetX()[grXZ->GetN()-1]) continue;
441 //get interpolated value at the center for the pad row
443 // const Double_t localY=splXY->Eval(localX/*,0x0,"S"*/);
444 // const Double_t localZ=splXZ->Eval(localX/*,0x0,"S"*/);
445 const Double_t localY=grXY->Eval(localX/*,0x0,"S"*/);
446 const Double_t localZ=grXZ->Eval(localX/*,0x0,"S"*/);
447 Float_t xyz[3]={localX,localY,localZ};
449 if (!SetupCluster(tempCl,xyz,sec,t0)) continue;
450 tempCl.SetLabel(tr.GetUniqueID(), 0);
452 if (type==0) tr.AddSpacePoint(tempCl);
453 else tr.AddDistortedSpacePoint(tempCl);
454 // printf("SetupCluster %3d: (%.2f, %.2f, %.2f), %d, %.2f\n",irow,xyz[0],xyz[1],xyz[2],sec,t0);
464 //________________________________________________________________
465 Bool_t AliToyMCEventGenerator::SetupCluster(AliTPCclusterMI &tempCl, Float_t xyz[3], Int_t sec, Double_t t0)
471 // intrinsic cluster resolution is 1mm
472 const Double_t kSigmaY = 0.1;
473 const Double_t kSigmaZ = 0.1;
474 const Double_t kMaxZ0 = fTPCParam->GetZLength();
475 //TODO: Get this from the OCDB at some point?
476 const Double_t kDriftVel = fTPCParam->GetDriftV();
478 // smear the ideal positions with the cluster resolution
479 xyz[1]+=gRandom->Gaus(0,kSigmaY);
480 xyz[2]+=gRandom->Gaus(0,kSigmaZ);
486 tempCl.SetSigmaY2(kSigmaY*kSigmaY);
487 tempCl.SetSigmaZ2(kSigmaZ*kSigmaZ);
489 // transform from the local coordinates to the coordinates expressed in pad coordinates
490 Int_t index[3] = {0,sec,0};
491 fTPCParam->Transform2to3(xyz,index);
492 fTPCParam->Transform3to4(xyz,index);
493 fTPCParam->Transform4to8(xyz,index);
495 const Int_t row = index[2];
496 const Int_t nPads = fTPCParam->GetNPads(sec, row);
497 // pad is fractional, but it needs to be shifted from the center
498 // to the edge of the row
499 const Float_t pad = xyz[1] + nPads/2;
503 Float_t timeBin=Float_t(t0 + (kMaxZ0-TMath::Abs(tempCl.GetZ()))/kDriftVel);
504 tempCl.SetTimeBin(timeBin); // set time as t0 + drift time from dist z
505 tempCl.SetDetector(sec);
507 //check if we are in the active area
508 if (pad<0 || pad>=nPads) return kFALSE;
513 //________________________________________________________________
514 Bool_t AliToyMCEventGenerator::ConnectOutputFile()
517 // Create the output file name and tree and connect the event
520 fOutFile = new TFile(fOutputFileName.Data(),"recreate");
522 if (!fOutFile || !fOutFile->IsOpen()){
528 fOutTree = new TTree("toyMCtree","Tree with toyMC simulation");
529 fOutTree->Branch("event","AliToyMCEvent",&fEvent);
536 //________________________________________________________________
537 Bool_t AliToyMCEventGenerator::CloseOutputFile()
540 // close the output file
542 if (!fOutFile) return kFALSE;
551 //________________________________________________________________
552 void AliToyMCEventGenerator::FillTree()
555 if (fOutTree&&fEvent) fOutTree->Fill();
558 //________________________________________________________________
559 void AliToyMCEventGenerator::SetSpaceCharge(EEpsilon epsilon, EGasType gasType/*=kNeCO2_9010*/,
560 ECollRate collRate/*=k50kHz*/, ECorrection corrType/*=kLookup*/)
563 // Set the space charge conditions
565 fCorrectionFile="$ALICE_ROOT/TPC/Calib/maps/SC";
568 fCorrectionFile.Append("_NeCO2");
571 fCorrectionFile.Append("_NeCO2N2");
576 fCorrectionFile.Append("_eps5");
579 fCorrectionFile.Append("_eps10");
582 fCorrectionFile.Append("_eps20");
585 fCorrectionFile.Append("_eps25");
588 fCorrectionFile.Append("_eps30");
591 fCorrectionFile.Append("_eps35");
594 fCorrectionFile.Append("_eps40");
599 fCorrectionFile.Append("_50kHz");
604 fCorrectionFile.Append("_precal.lookup.root");
606 case kSpaceChargeFile:
607 fCorrectionFile.Append("_precal.root");
612 //________________________________________________________________
613 void AliToyMCEventGenerator::InitSpaceCharge()
616 // init the space charge conditions
617 // this should be called after the tree was connected
621 InitSpaceChargeList();
625 AliInfo(Form("Using space charge map file: '%s'",fCorrectionFile.Data()));
627 SetCorrectionFromFile(fCorrectionFile, fTPCCorrection);
630 AliInfo("Attaching space charge map file name to the tree");
631 fOutTree->GetUserInfo()->Add(new TObjString(fCorrectionFile.Data()));
635 //________________________________________________________________
636 void AliToyMCEventGenerator::InitSpaceChargeList()
639 // init space charge conditions from a list of files
640 // this should be called after the tree was connected
643 std::ifstream file(fSCListFile.Data());
647 TObjArray *arr=list.Tokenize("\n");
648 if (!arr->GetEntriesFast()) {
650 AliFatal(Form("No SC file initialised. SC list '%s' seems empty",fSCListFile.Data()));
654 // it is assumed that in case of an input list
655 // fCorrectionFile contains the name of the average correction
656 // to be then used in the reconstruction
658 if (fCorrectionFile.IsNull()) {
659 AliFatal("List of SC files set, but no average map is specified. Use 'SetSpaceChargeFile' to do so");
662 AliInfo("Attaching average space charge map file name to the tree");
663 fOutTree->GetUserInfo()->Add(new TObjString(fCorrectionFile.Data()));
666 // check for an average map
667 if (!fCorrectionFile.IsNull()) {
668 SetCorrectionFromFile(fCorrectionFile, fTPCCorrectionAv);
671 // case of non preread
672 // store the names of the files
673 if (!fPrereadSCList) {
674 if (fSCList) delete fSCList;
680 // load all SC files and set them to the list
681 if (!fSCList) fSCList=new TObjArray;
685 for (Int_t ifile=0; ifile<arr->GetEntriesFast(); ++ifile) {
686 TString scname=arr->At(ifile)->GetName();
687 AliTPCCorrection *sc=0x0;
688 SetCorrectionFromFile(scname, sc);
694 //________________________________________________________________
695 void AliToyMCEventGenerator::IterateSC(Int_t ipos)
698 // In case a list of SC files is set iterate over them
701 if (!HasSCList()) return;
704 if (fOutTree) ipos=fOutTree->GetEntries();
708 TObject *sc=fSCList->At(ipos%fSCList->GetEntriesFast());
709 AliInfo(Form("Event: %d - SC: %s",ipos,sc->GetName()));
710 // case SC files have been preread
711 if (fPrereadSCList) {
712 fTPCCorrection=(AliTPCCorrection*)sc;
716 // case no preread was done
717 TString &file=((TObjString*)sc)->String();
718 delete fTPCCorrection;
721 SetCorrectionFromFile(file, fTPCCorrection);
723 if (!fTPCCorrection) {
724 AliFatal(Form("Could not read SC map from SC file '%s'",file.Data()));
730 //________________________________________________________________
731 Float_t AliToyMCEventGenerator::GetSCScalingFactor(AliTPCCorrection *corr, AliTPCCorrection *averageCorr, Float_t &chi2)
734 // calculate the scaling factor
735 // between the fluctuation map and the average map
738 TLinearFitter fitter(2,"pol1");
740 for (Float_t iz=-245; iz<=245; iz+=10) {
741 Short_t roc=(iz>=0)?0:18;
742 for (Float_t ir=86; ir<250; ir+=10) {
743 for (Float_t iphi=0; iphi<TMath::TwoPi(); iphi+=10*TMath::DegToRad()){
744 Float_t x=ir*(Float_t)TMath::Cos(iphi);
745 Float_t y=ir*(Float_t)TMath::Sin(iphi);
746 Float_t x3[3] = {x,y,iz};
747 Float_t dx3[3] = {0.,0.,0.};
748 Float_t dx3av[3] = {0.,0.,0.};
750 corr->GetDistortion(x3,roc,dx3);
751 averageCorr->GetDistortion(x3,roc,dx3av);
753 Double_t dr = TMath::Sqrt(dx3[0]*dx3[0] + dx3[1]*dx3[1]);
754 Double_t drav = TMath::Sqrt(dx3av[0]*dx3av[0] + dx3av[1]*dx3av[1]);
756 fitter.AddPoint(&drav,dr);
762 chi2 = fitter.GetChisquare()/fitter.GetNpoints();
763 return fitter.GetParameter(1);
766 //________________________________________________________________
767 void AliToyMCEventGenerator::SetSCScalingFactor()
770 // if running with a SC list calculate the scaling factor
771 // between the fluctuation map and the average map
774 if ( !(HasSCList() && fTPCCorrection && fTPCCorrectionAv && fEvent) ) return;
776 // loop over several z, r and phi bins and find a factor that minimises
777 // the distortions between the current map and the average map
780 Float_t factor = GetSCScalingFactor(fTPCCorrection, fTPCCorrectionAv, chi2);
782 fEvent->SetSCscale(factor);
783 fEvent->SetSCscaleChi2(chi2);
786 //________________________________________________________________
787 void AliToyMCEventGenerator::SetCorrectionFromFile(TString file, AliTPCCorrection* &corr)
790 // read the correction from file and set it to corr
794 TString corrName("map");
796 // allow for specifying an object name for the AliTPCCorrection in the file name
797 // separated by a ':'
798 TObjArray *arr=file.Tokenize(":");
799 if (arr->GetEntriesFast()>1) {
800 file=arr->At(0)->GetName();
801 corrName=arr->At(1)->GetName();
806 TFile f(file.Data());
807 if (!f.IsOpen()||f.IsZombie()) {
808 printf("E-AliToyMCEventGenerator::Could not open SC file '%s'",file.Data());
812 corr=(AliTPCSpaceCharge3D*)f.Get(corrName.Data());
813 if (corr) corr->SetName(f.GetName());