+
/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
* *
///////////////////////////////////////////////////////////////////////////////
// //
-// TRD cluster finder base class //
+// TRD cluster finder //
// //
///////////////////////////////////////////////////////////////////////////////
-#include <TROOT.h>
+#include <TF1.h>
#include <TTree.h>
+#include <TH1.h>
#include <TFile.h>
#include <TObjArray.h>
#include "AliRunLoader.h"
#include "AliLoader.h"
+#include "AliRawReader.h"
#include "AliLog.h"
+#include "AliAlignObj.h"
#include "AliTRDclusterizer.h"
#include "AliTRDcluster.h"
-#include "AliTRDrecPoint.h"
+#include "AliTRDReconstructor.h"
#include "AliTRDgeometry.h"
+#include "AliTRDdataArrayF.h"
+#include "AliTRDdataArrayI.h"
+#include "AliTRDdataArrayS.h"
+#include "AliTRDdigitsManager.h"
+#include "AliTRDrawData.h"
#include "AliTRDcalibDB.h"
+#include "AliTRDrecoParam.h"
#include "AliTRDCommonParam.h"
+#include "AliTRDtransform.h"
+#include "AliTRDSignalIndex.h"
+#include "AliTRDrawStreamBase.h"
+#include "AliTRDfeeParam.h"
+
+#include "Cal/AliTRDCalROC.h"
+#include "Cal/AliTRDCalDet.h"
ClassImp(AliTRDclusterizer)
,fRunLoader(NULL)
,fClusterTree(NULL)
,fRecPoints(NULL)
+ ,fDigitsManager(NULL)
+ ,fAddLabels(kTRUE)
+ ,fRawVersion(2)
+ ,fIndexesOut(NULL)
+ ,fIndexesMaxima(NULL)
+ ,fTransform(new AliTRDtransform(0))
+ ,fLUTbin(0)
+ ,fLUT(NULL)
{
//
// AliTRDclusterizer default constructor
//
+ fRawVersion = AliTRDfeeParam::Instance()->GetRAWversion();
+
}
//_____________________________________________________________________________
-AliTRDclusterizer::AliTRDclusterizer(const Text_t* name, const Text_t* title)
+AliTRDclusterizer::AliTRDclusterizer(const Text_t *name, const Text_t *title)
:TNamed(name,title)
,fRunLoader(NULL)
,fClusterTree(NULL)
,fRecPoints(NULL)
+ ,fDigitsManager(new AliTRDdigitsManager())
+ ,fAddLabels(kTRUE)
+ ,fRawVersion(2)
+ ,fIndexesOut(NULL)
+ ,fIndexesMaxima(NULL)
+ ,fTransform(new AliTRDtransform(0))
+ ,fLUTbin(0)
+ ,fLUT(NULL)
{
//
// AliTRDclusterizer constructor
//
+ fDigitsManager->CreateArrays();
+
+ fRawVersion = AliTRDfeeParam::Instance()->GetRAWversion();
+
+ FillLUT();
+
}
//_____________________________________________________________________________
,fRunLoader(NULL)
,fClusterTree(NULL)
,fRecPoints(NULL)
+ ,fDigitsManager(NULL)
+ ,fAddLabels(kTRUE)
+ ,fRawVersion(2)
+ ,fIndexesOut(NULL)
+ ,fIndexesMaxima(NULL)
+ ,fTransform(NULL)
+ ,fLUTbin(0)
+ ,fLUT(0)
{
//
// AliTRDclusterizer copy constructor
//
+ FillLUT();
+
}
//_____________________________________________________________________________
// AliTRDclusterizer destructor
//
- if (fRecPoints) {
- fRecPoints->Delete();
- delete fRecPoints;
- }
+ if (fRecPoints)
+ {
+ fRecPoints->Delete();
+ delete fRecPoints;
+ }
+
+ if (fDigitsManager)
+ {
+ delete fDigitsManager;
+ fDigitsManager = NULL;
+ }
+
+ if (fIndexesOut)
+ {
+ delete fIndexesOut;
+ fIndexesOut = NULL;
+ }
+
+ if (fIndexesMaxima)
+ {
+ delete fIndexesMaxima;
+ fIndexesMaxima = NULL;
+ }
+
+ if (fTransform)
+ {
+ delete fTransform;
+ fTransform = NULL;
+ }
+
+ if (fLUT)
+ {
+ delete [] fLUT;
+ fLUT = NULL;
+ }
}
// Assignment operator
//
- if (this != &c) {
- ((AliTRDclusterizer &) c).Copy(*this);
- }
+ if (this != &c)
+ {
+ ((AliTRDclusterizer &) c).Copy(*this);
+ }
return *this;
}
// Copy function
//
- ((AliTRDclusterizer &) c).fClusterTree = NULL;
- ((AliTRDclusterizer &) c).fRecPoints = NULL;
+ ((AliTRDclusterizer &) c).fClusterTree = NULL;
+ ((AliTRDclusterizer &) c).fRecPoints = NULL;
+ ((AliTRDclusterizer &) c).fDigitsManager = NULL;
+ ((AliTRDclusterizer &) c).fAddLabels = fAddLabels;
+ ((AliTRDclusterizer &) c).fRawVersion = fRawVersion;
+ ((AliTRDclusterizer &) c).fIndexesOut = NULL;
+ ((AliTRDclusterizer &) c).fIndexesMaxima = NULL;
+ ((AliTRDclusterizer &) c).fTransform = NULL;
+ ((AliTRDclusterizer &) c).fLUTbin = 0;
+ ((AliTRDclusterizer &) c).fLUT = NULL;
}
detRecPoints->AddLast(c);
}
else {
- AliError("Attempt to write a cluster with unexpected detector index\n");
+ AliError(Form("Attempt to write a cluster with unexpected detector index: got=%d expected=%d\n"
+ ,c->GetDetector()
+ ,det));
}
}
fClusterTree->Fill();
delete detRecPoints;
-
+
return kTRUE;
}
}
+//_____________________________________________________________________________
+void AliTRDclusterizer::ResetHelperIndexes(AliTRDSignalIndex *indexesIn)
+{
+ //
+ // Reset the helper indexes
+ //
+
+ if (fIndexesOut)
+ {
+ // carefull here - we assume that only row number may change - most probable
+ if (indexesIn->GetNrow() <= fIndexesOut->GetNrow())
+ fIndexesOut->ResetContent();
+ else
+ fIndexesOut->ResetContentConditional(indexesIn->GetNrow()
+ , indexesIn->GetNcol()
+ , indexesIn->GetNtime());
+ }
+ else
+ {
+ fIndexesOut = new AliTRDSignalIndex(indexesIn->GetNrow()
+ , indexesIn->GetNcol()
+ , indexesIn->GetNtime());
+ }
+
+ if (fIndexesMaxima)
+ {
+ // carefull here - we assume that only row number may change - most probable
+ if (indexesIn->GetNrow() <= fIndexesMaxima->GetNrow())
+ {
+ fIndexesMaxima->ResetContent();
+ }
+ else
+ {
+ fIndexesMaxima->ResetContentConditional(indexesIn->GetNrow()
+ , indexesIn->GetNcol()
+ , indexesIn->GetNtime());
+ }
+ }
+ else
+ {
+ fIndexesMaxima = new AliTRDSignalIndex(indexesIn->GetNrow()
+ , indexesIn->GetNcol()
+ , indexesIn->GetNtime());
+ }
+
+}
//_____________________________________________________________________________
-AliTRDcluster* AliTRDclusterizer::AddCluster(Double_t *pos, Int_t timebin
- , Int_t det, Double_t amp
- , Int_t *tracks, Double_t *sig
- , Int_t iType, Float_t center)
+Bool_t AliTRDclusterizer::ReadDigits()
{
//
- // Add a cluster for the TRD
+ // Reads the digits arrays from the input aliroot file
//
- AliTRDcluster *c = new AliTRDcluster();
-
- c->SetDetector(det);
- c->SetQ(amp);
- c->SetX(pos[2]);
- c->SetY(pos[0]);
- c->SetZ(pos[1]);
- c->SetSigmaY2(sig[0]);
- c->SetSigmaZ2(sig[1]);
- c->SetLocalTimeBin(timebin);
- c->SetCenter(center);
+ if (!fRunLoader) {
+ AliError("No run loader available");
+ return kFALSE;
+ }
- if (tracks) {
- c->AddTrackIndex(tracks);
+ AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
+ if (!loader->TreeD()) {
+ loader->LoadDigits();
}
- switch (iType) {
- case 0:
- c->Set2pad();
- break;
- case 1:
- c->Set3pad();
- break;
- case 2:
- c->Set4pad();
- break;
- case 3:
- c->Set5pad();
- break;
- case 4:
- c->SetLarge();
- break;
- };
-
- RecPoints()->Add(c);
- return c;
+ // Read in the digit arrays
+ return (fDigitsManager->ReadDigits(loader->TreeD()));
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::ReadDigits(TTree *digitsTree)
+{
+ //
+ // Reads the digits arrays from the input tree
+ //
+
+ // Read in the digit arrays
+ return (fDigitsManager->ReadDigits(digitsTree));
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::ReadDigits(AliRawReader *rawReader)
+{
+ //
+ // Reads the digits arrays from the ddl file
+ //
+
+ AliTRDrawData raw;
+ fDigitsManager = raw.Raw2Digits(rawReader);
+
+ return kTRUE;
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::MakeClusters()
+{
+ //
+ // Creates clusters from digits
+ //
+
+ // Propagate info from the digits manager
+ if (fAddLabels == kTRUE)
+ {
+ fAddLabels = fDigitsManager->UsesDictionaries();
+ }
+
+ Bool_t fReturn = kTRUE;
+ for (Int_t i = 0; i < AliTRDgeometry::kNdet; i++)
+ {
+
+ AliTRDdataArrayS *digitsIn = (AliTRDdataArrayS *) fDigitsManager->GetDigits(i);
+ // This is to take care of switched off super modules
+ if (!digitsIn->HasData())
+ {
+ continue;
+ }
+ digitsIn->Expand();
+ AliTRDSignalIndex* indexes = fDigitsManager->GetIndexes(i);
+ if (indexes->IsAllocated() == kFALSE)
+ {
+ fDigitsManager->BuildIndexes(i);
+ }
+
+ Bool_t fR = kFALSE;
+ if (indexes->HasEntry())
+ {
+ if (fAddLabels)
+ {
+ for (Int_t iDict = 0; iDict < AliTRDdigitsManager::kNDict; iDict++)
+ {
+ AliTRDdataArrayI *tracksIn = 0;
+ tracksIn = (AliTRDdataArrayI *) fDigitsManager->GetDictionary(i,iDict);
+ tracksIn->Expand();
+ }
+ }
+ fR = MakeClusters(i);
+ fReturn = fR && fReturn;
+ }
+
+ if (fR == kFALSE)
+ {
+ WriteClusters(i);
+ ResetRecPoints();
+ }
+
+ // No compress just remove
+ fDigitsManager->RemoveDigits(i);
+ fDigitsManager->RemoveDictionaries(i);
+ fDigitsManager->ClearIndexes(i);
+
+ }
+
+ return fReturn;
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::Raw2Clusters(AliRawReader *rawReader)
+{
+ //
+ // Creates clusters from raw data
+ //
+
+ return Raw2ClustersChamber(rawReader);
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::Raw2ClustersChamber(AliRawReader *rawReader)
+{
+ //
+ // Creates clusters from raw data
+ //
+
+ // Create the digits manager
+ if (!fDigitsManager)
+ {
+ fDigitsManager = new AliTRDdigitsManager();
+ fDigitsManager->CreateArrays();
+ }
+
+ fDigitsManager->SetUseDictionaries(fAddLabels);
+
+ AliTRDrawStreamBase *pinput = AliTRDrawStreamBase::GetRawStream(rawReader);
+ AliTRDrawStreamBase &input = *pinput;
+
+ AliInfo(Form("Stream version: %s", input.IsA()->GetName()));
+
+ Int_t det = 0;
+ while ((det = input.NextChamber(fDigitsManager)) >= 0)
+ {
+ Bool_t iclusterBranch = kFALSE;
+ if (fDigitsManager->GetIndexes(det)->HasEntry())
+ {
+ iclusterBranch = MakeClusters(det);
+ }
+ if (iclusterBranch == kFALSE)
+ {
+ WriteClusters(det);
+ ResetRecPoints();
+ }
+ fDigitsManager->RemoveDigits(det);
+ fDigitsManager->RemoveDictionaries(det);
+ fDigitsManager->ClearIndexes(det);
+ }
+
+ delete fDigitsManager;
+ fDigitsManager = NULL;
+
+ delete pinput;
+ pinput = NULL;
+ return kTRUE;
+
+}
+
+//_____________________________________________________________________________
+Bool_t AliTRDclusterizer::MakeClusters(Int_t det)
+{
+ //
+ // Generates the cluster.
+ //
+
+ // Get the digits
+ // digits should be expanded beforehand!
+ // digitsIn->Expand();
+ AliTRDdataArrayS *digitsIn = (AliTRDdataArrayS *) fDigitsManager->GetDigits(det);
+
+ // This is to take care of switched off super modules
+ if (!digitsIn->HasData())
+ {
+ return kFALSE;
+ }
+
+ AliTRDSignalIndex *indexesIn = fDigitsManager->GetIndexes(det);
+ if (indexesIn->IsAllocated() == kFALSE)
+ {
+ AliError("Indexes do not exist!");
+ return kFALSE;
+ }
+
+ AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
+ if (!calibration)
+ {
+ AliFatal("No AliTRDcalibDB instance available\n");
+ return kFALSE;
+ }
+
+ // ADC thresholds
+ // There is no ADC threshold anymore, and simParam should not be used in clusterizer. KO
+ Float_t adcThreshold = 0;
+
+ if (!AliTRDReconstructor::RecoParam())
+ {
+ AliError("RecoParam does not exist\n");
+ return kFALSE;
+ }
+
+ // Threshold value for the maximum
+ Float_t maxThresh = AliTRDReconstructor::RecoParam()->GetClusMaxThresh();
+ // Threshold value for the digit signal
+ Float_t sigThresh = AliTRDReconstructor::RecoParam()->GetClusSigThresh();
+
+ // Iteration limit for unfolding procedure
+ const Float_t kEpsilon = 0.01;
+ const Int_t kNclus = 3;
+ const Int_t kNsig = 5;
+
+ Int_t iUnfold = 0;
+ Double_t ratioLeft = 1.0;
+ Double_t ratioRight = 1.0;
+
+ Double_t padSignal[kNsig];
+ Double_t clusterSignal[kNclus];
+
+ Int_t icham = indexesIn->GetChamber();
+ Int_t iplan = indexesIn->GetPlane();
+ Int_t isect = indexesIn->GetSM();
+
+ // Start clustering in the chamber
+
+ Int_t idet = AliTRDgeometry::GetDetector(iplan,icham,isect);
+ if (idet != det)
+ {
+ AliError("Strange Detector number Missmatch!");
+ return kFALSE;
+ }
+
+ // TRD space point transformation
+ fTransform->SetDetector(det);
+
+ Int_t ilayer = AliGeomManager::kTRD1 + iplan;
+ Int_t imodule = icham + AliTRDgeometry::Ncham() * isect;
+ UShort_t volid = AliGeomManager::LayerToVolUID(ilayer,imodule);
+
+ Int_t nColMax = digitsIn->GetNcol();
+ Int_t nTimeTotal = digitsIn->GetNtime();
+
+ // Detector wise calibration object for the gain factors
+ const AliTRDCalDet *calGainFactorDet = calibration->GetGainFactorDet();
+ // Calibration object with pad wise values for the gain factors
+ AliTRDCalROC *calGainFactorROC = calibration->GetGainFactorROC(idet);
+ // Calibration value for chamber wise gain factor
+ Float_t calGainFactorDetValue = calGainFactorDet->GetValue(idet);
+
+ Int_t nClusters = 0;
+
+ AliTRDdataArrayF *digitsOut = new AliTRDdataArrayF(digitsIn->GetNrow()
+ ,digitsIn->GetNcol()
+ ,digitsIn->GetNtime());
+
+ ResetHelperIndexes(indexesIn);
+
+ // Apply the gain and the tail cancelation via digital filter
+ TailCancelation(digitsIn
+ ,digitsOut
+ ,indexesIn
+ ,fIndexesOut
+ ,nTimeTotal
+ ,adcThreshold
+ ,calGainFactorROC
+ ,calGainFactorDetValue);
+
+ Int_t row = 0;
+ Int_t col = 0;
+ Int_t time = 0;
+ Int_t iPad = 0;
+
+ fIndexesOut->ResetCounters();
+ while (fIndexesOut->NextRCTbinIndex(row, col, time))
+ {
+
+ Float_t signalM = TMath::Abs(digitsOut->GetDataUnchecked(row,col,time));
+
+ // Look for the maximum
+ if (signalM >= maxThresh)
+ {
+
+ if (col + 1 >= nColMax || col-1 < 0)
+ continue;
+
+ Float_t signalL = TMath::Abs(digitsOut->GetDataUnchecked(row,col+1,time));
+ Float_t signalR = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time));
+
+ if ((TMath::Abs(signalL) <= signalM) &&
+ (TMath::Abs(signalR) < signalM))
+ {
+ if ((TMath::Abs(signalL) >= sigThresh) ||
+ (TMath::Abs(signalR) >= sigThresh))
+ {
+ // Maximum found, mark the position by a negative signal
+ digitsOut->SetDataUnchecked(row,col,time,-signalM);
+ fIndexesMaxima->AddIndexTBin(row,col,time);
+ }
+ }
+
+ }
+
+ }
+
+ // The index to the first cluster of a given ROC
+ Int_t firstClusterROC = -1;
+ // The number of cluster in a given ROC
+ Int_t nClusterROC = 0;
+
+ // Now check the maxima and calculate the cluster position
+ fIndexesMaxima->ResetCounters();
+ while (fIndexesMaxima->NextRCTbinIndex(row, col, time))
+ {
+
+ // Maximum found ?
+ if (digitsOut->GetDataUnchecked(row,col,time) < 0.0)
+ {
+
+ for (iPad = 0; iPad < kNclus; iPad++)
+ {
+ Int_t iPadCol = col - 1 + iPad;
+ clusterSignal[iPad] = TMath::Abs(digitsOut->GetDataUnchecked(row,iPadCol,time));
+ }
+
+ // Count the number of pads in the cluster
+ Int_t nPadCount = 0;
+ Int_t ii;
+ // Look to the left
+ ii = 0;
+ while (TMath::Abs(digitsOut->GetDataUnchecked(row,col-ii ,time)) >= sigThresh)
+ {
+ nPadCount++;
+ ii++;
+ if (col-ii < 0) break;
+ }
+ // Look to the right
+ ii = 0;
+ while (TMath::Abs(digitsOut->GetDataUnchecked(row,col+ii+1,time)) >= sigThresh)
+ {
+ nPadCount++;
+ ii++;
+ if (col+ii+1 >= nColMax) break;
+ }
+ nClusters++;
+
+ // Look for 5 pad cluster with minimum in the middle
+ Bool_t fivePadCluster = kFALSE;
+ if (col < (nColMax - 3))
+ {
+ if (digitsOut->GetDataUnchecked(row,col+2,time) < 0)
+ {
+ fivePadCluster = kTRUE;
+ }
+ if ((fivePadCluster) && (col < (nColMax - 5)))
+ {
+ if (digitsOut->GetDataUnchecked(row,col+4,time) >= sigThresh)
+ {
+ fivePadCluster = kFALSE;
+ }
+ }
+ if ((fivePadCluster) && (col > 1))
+ {
+ if (digitsOut->GetDataUnchecked(row,col-2,time) >= sigThresh)
+ {
+ fivePadCluster = kFALSE;
+ }
+ }
+ }
+
+ // 5 pad cluster
+ // Modify the signal of the overlapping pad for the left part
+ // of the cluster which remains from a previous unfolding
+ if (iUnfold)
+ {
+ clusterSignal[0] *= ratioLeft;
+ iUnfold = 0;
+ }
+
+ // Unfold the 5 pad cluster
+ if (fivePadCluster)
+ {
+ for (iPad = 0; iPad < kNsig; iPad++)
+ {
+ padSignal[iPad] = TMath::Abs(digitsOut->GetDataUnchecked(row
+ ,col-1+iPad
+ ,time));
+ }
+ // Unfold the two maxima and set the signal on
+ // the overlapping pad to the ratio
+ ratioRight = Unfold(kEpsilon,iplan,padSignal);
+ ratioLeft = 1.0 - ratioRight;
+ clusterSignal[2] *= ratioRight;
+ iUnfold = 1;
+ }
+
+ // The position of the cluster in COL direction relative to the center pad (pad units)
+ Double_t clusterPosCol = 0.0;
+ if (AliTRDReconstructor::RecoParam()->LUTOn())
+ {
+ // Calculate the position of the cluster by using the
+ // lookup table method
+ clusterPosCol = LUTposition(iplan,clusterSignal[0]
+ ,clusterSignal[1]
+ ,clusterSignal[2]);
+ }
+ else
+ {
+ // Calculate the position of the cluster by using the
+ // center of gravity method
+ for (Int_t i = 0; i < kNsig; i++)
+ {
+ padSignal[i] = 0.0;
+ }
+ padSignal[2] = TMath::Abs(digitsOut->GetDataUnchecked(row,col ,time)); // Central pad
+ padSignal[1] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-1,time)); // Left pad
+ padSignal[3] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+1,time)); // Right pad
+ if ((col > 2) &&
+ (TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time)) < padSignal[1]))
+ {
+ padSignal[0] = TMath::Abs(digitsOut->GetDataUnchecked(row,col-2,time));
+ }
+ if ((col < nColMax - 3) &&
+ (TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time)) < padSignal[3]))
+ {
+ padSignal[4] = TMath::Abs(digitsOut->GetDataUnchecked(row,col+2,time));
+ }
+ clusterPosCol = GetCOG(padSignal);
+ }
+
+ // Store the amplitudes of the pads in the cluster for later analysis
+ Short_t signals[7] = { 0, 0, 0, 0, 0, 0, 0 };
+ for (Int_t jPad = col-3; jPad <= col+3; jPad++)
+ {
+ if ((jPad < 0) ||
+ (jPad >= nColMax-1))
+ {
+ continue;
+ }
+ signals[jPad-col+3] = TMath::Nint(TMath::Abs(digitsOut->GetDataUnchecked(row,jPad,time)));
+ }
+
+ // Transform the local cluster coordinates into calibrated
+ // space point positions defined in the local tracking system.
+ // Here the calibration for T0, Vdrift and ExB is applied as well.
+ Double_t clusterXYZ[6];
+ clusterXYZ[0] = clusterPosCol;
+ clusterXYZ[1] = clusterSignal[0];
+ clusterXYZ[2] = clusterSignal[1];
+ clusterXYZ[3] = clusterSignal[2];
+ clusterXYZ[4] = 0.0;
+ clusterXYZ[5] = 0.0;
+ Int_t clusterRCT[3];
+ clusterRCT[0] = row;
+ clusterRCT[1] = col;
+ clusterRCT[2] = 0;
+
+ Bool_t out = kTRUE;
+ if (fTransform->Transform(clusterXYZ, clusterRCT, ((UInt_t) time), out, 0)) {
+
+ // Add the cluster to the output array
+ // The track indices will be stored later
+ Float_t clusterPos[3];
+ clusterPos[0] = clusterXYZ[0];
+ clusterPos[1] = clusterXYZ[1];
+ clusterPos[2] = clusterXYZ[2];
+ Float_t clusterSig[2];
+ clusterSig[0] = clusterXYZ[4];
+ clusterSig[1] = clusterXYZ[5];
+ Double_t clusterCharge = clusterXYZ[3];
+ Char_t clusterTimeBin = ((Char_t) clusterRCT[2]);
+ AliTRDcluster *cluster = new AliTRDcluster(idet
+ ,clusterCharge
+ ,clusterPos
+ ,clusterSig
+ ,0x0
+ ,((Char_t) nPadCount)
+ ,signals
+ ,((UChar_t) col)
+ ,((UChar_t) row)
+ ,((UChar_t) time)
+ ,clusterTimeBin
+ ,clusterPosCol
+ ,volid);
+ cluster->SetInChamber(!out);
+
+ // Temporarily store the row, column and time bin of the center pad
+ // Used to later on assign the track indices
+ cluster->SetLabel( row,0);
+ cluster->SetLabel( col,1);
+ cluster->SetLabel(time,2);
+
+ RecPoints()->Add(cluster);
+
+ // Store the index of the first cluster in the current ROC
+ if (firstClusterROC < 0)
+ {
+ firstClusterROC = RecPoints()->GetEntriesFast() - 1;
+ }
+
+ // Count the number of cluster in the current ROC
+ nClusterROC++;
+
+ } // if: Transform ok ?
+
+ } // if: Maximum found ?
+
+ }
+
+ delete digitsOut;
+
+ if (fAddLabels)
+ {
+ AddLabels(idet, firstClusterROC, nClusterROC);
+ }
+
+ // Write the cluster and reset the array
+ WriteClusters(idet);
+ ResetRecPoints();
+
+ return kTRUE;
}
//_____________________________________________________________________________
-Double_t AliTRDclusterizer::CalcXposFromTimebin(Float_t timebin, Int_t idet
- , Int_t col, Int_t row)
+Bool_t AliTRDclusterizer::AddLabels(Int_t idet, Int_t firstClusterROC, Int_t nClusterROC)
{
//
- // Calculates the local x position in the detector from the timebin,
- // depends on the drift velocity and t0
+ // Add the track indices to the found clusters
//
- AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
+ const Int_t kNclus = 3;
+ const Int_t kNdict = AliTRDdigitsManager::kNDict;
+ const Int_t kNtrack = kNdict * kNclus;
+
+ Int_t iClusterROC = 0;
+
+ Int_t row = 0;
+ Int_t col = 0;
+ Int_t time = 0;
+ Int_t iPad = 0;
+
+ // Temporary array to collect the track indices
+ Int_t *idxTracks = new Int_t[kNtrack*nClusterROC];
+
+ // Loop through the dictionary arrays one-by-one
+ // to keep memory consumption low
+ AliTRDdataArrayI *tracksIn = 0;
+ for (Int_t iDict = 0; iDict < kNdict; iDict++) {
+
+ // tracksIn should be expanded beforehand!
+ tracksIn = (AliTRDdataArrayI *) fDigitsManager->GetDictionary(idet,iDict);
+
+ // Loop though the clusters found in this ROC
+ for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
+
+ AliTRDcluster *cluster = (AliTRDcluster *)
+ RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
+ row = cluster->GetLabel(0);
+ col = cluster->GetLabel(1);
+ time = cluster->GetLabel(2);
+
+ for (iPad = 0; iPad < kNclus; iPad++) {
+ Int_t iPadCol = col - 1 + iPad;
+ Int_t index = tracksIn->GetDataUnchecked(row,iPadCol,time) - 1;
+ idxTracks[3*iPad+iDict + iClusterROC*kNtrack] = index;
+ }
+
+ }
+
+ }
+
+ // Copy the track indices into the cluster
+ // Loop though the clusters found in this ROC
+ for (iClusterROC = 0; iClusterROC < nClusterROC; iClusterROC++) {
+
+ AliTRDcluster *cluster = (AliTRDcluster *)
+ RecPoints()->UncheckedAt(firstClusterROC+iClusterROC);
+ cluster->SetLabel(-9999,0);
+ cluster->SetLabel(-9999,1);
+ cluster->SetLabel(-9999,2);
+
+ cluster->AddTrackIndex(&idxTracks[iClusterROC*kNtrack]);
+
+ }
+
+ delete [] idxTracks;
+
+ return kTRUE;
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDclusterizer::GetCOG(Double_t signal[5]) const
+{
+ //
+ // Get COG position
+ // Used for clusters with more than 3 pads - where LUT not applicable
+ //
+
+ Double_t sum = signal[0]
+ + signal[1]
+ + signal[2]
+ + signal[3]
+ + signal[4];
+
+ Double_t res = (0.0 * (-signal[0] + signal[4])
+ + (-signal[1] + signal[3])) / sum;
+
+ return res;
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDclusterizer::Unfold(Double_t eps, Int_t plane, Double_t *padSignal)
+{
+ //
+ // Method to unfold neighbouring maxima.
+ // The charge ratio on the overlapping pad is calculated
+ // until there is no more change within the range given by eps.
+ // The resulting ratio is then returned to the calling method.
+ //
+
+ AliTRDcalibDB *calibration = AliTRDcalibDB::Instance();
if (!calibration) {
- AliError("Cannot find calibration object");
- return -1;
+ AliError("No AliTRDcalibDB instance available\n");
+ return kFALSE;
}
- AliTRDCommonParam *parCom = AliTRDCommonParam::Instance();
- if (!parCom) {
- AliError("Could not get common parameters\n");
- return kFALSE;
+
+ Int_t irc = 0;
+ Int_t itStep = 0; // Count iteration steps
+
+ Double_t ratio = 0.5; // Start value for ratio
+ Double_t prevRatio = 0.0; // Store previous ratio
+
+ Double_t newLeftSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store left cluster signal
+ Double_t newRightSignal[3] = { 0.0, 0.0, 0.0 }; // Array to store right cluster signal
+ Double_t newSignal[3] = { 0.0, 0.0, 0.0 };
+
+ // Start the iteration
+ while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
+
+ itStep++;
+ prevRatio = ratio;
+
+ // Cluster position according to charge ratio
+ Double_t maxLeft = (ratio*padSignal[2] - padSignal[0])
+ / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
+ Double_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
+ / ((1.0 - ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
+
+ // Set cluster charge ratio
+ irc = calibration->PadResponse(1.0,maxLeft ,plane,newSignal);
+ Double_t ampLeft = padSignal[1] / newSignal[1];
+ irc = calibration->PadResponse(1.0,maxRight,plane,newSignal);
+ Double_t ampRight = padSignal[3] / newSignal[1];
+
+ // Apply pad response to parameters
+ irc = calibration->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
+ irc = calibration->PadResponse(ampRight,maxRight,plane,newRightSignal);
+
+ // Calculate new overlapping ratio
+ ratio = TMath::Min((Double_t) 1.0
+ ,newLeftSignal[2] / (newLeftSignal[2] + newRightSignal[0]));
+
}
- Float_t vdrift = calibration->GetVdrift(idet,col,row);
- Float_t t0 = calibration->GetT0(idet,col,row);
- Float_t samplingFrequency = parCom->GetSamplingFrequency();
+ return ratio;
- timebin -= t0;
+}
- return timebin / samplingFrequency * vdrift;
+//_____________________________________________________________________________
+void AliTRDclusterizer::TailCancelation(AliTRDdataArrayS *digitsIn
+ , AliTRDdataArrayF *digitsOut
+ , AliTRDSignalIndex *indexesIn
+ , AliTRDSignalIndex *indexesOut
+ , Int_t nTimeTotal
+ , Float_t adcThreshold
+ , AliTRDCalROC *calGainFactorROC
+ , Float_t calGainFactorDetValue)
+{
+ //
+ // Applies the tail cancelation and gain factors:
+ // Transform digitsIn to digitsOut
+ //
+
+ Int_t iRow = 0;
+ Int_t iCol = 0;
+ Int_t iTime = 0;
+
+ Double_t *inADC = new Double_t[nTimeTotal]; // ADC data before tail cancellation
+ Double_t *outADC = new Double_t[nTimeTotal]; // ADC data after tail cancellation
+ indexesIn->ResetCounters();
+ while (indexesIn->NextRCIndex(iRow, iCol))
+ {
+ Float_t calGainFactorROCValue = calGainFactorROC->GetValue(iCol,iRow);
+ Double_t gain = calGainFactorDetValue
+ * calGainFactorROCValue;
+
+ for (iTime = 0; iTime < nTimeTotal; iTime++)
+ {
+ // Apply gain gain factor
+ inADC[iTime] = digitsIn->GetDataUnchecked(iRow,iCol,iTime);
+ inADC[iTime] /= gain;
+ outADC[iTime] = inADC[iTime];
+ }
+
+ // Apply the tail cancelation via the digital filter
+ if (AliTRDReconstructor::RecoParam()->TCOn())
+ {
+ DeConvExp(inADC,outADC,nTimeTotal,AliTRDReconstructor::RecoParam()->GetTCnexp());
+ }
+
+ indexesIn->ResetTbinCounter();
+ while (indexesIn->NextTbinIndex(iTime))
+ {
+ // Store the amplitude of the digit if above threshold
+ if (outADC[iTime] > adcThreshold)
+ {
+ digitsOut->SetDataUnchecked(iRow,iCol,iTime,outADC[iTime]);
+ indexesOut->AddIndexTBin(iRow,iCol,iTime);
+ }
+ } // while itime
+
+ } // while irow icol
+
+ delete [] inADC;
+ delete [] outADC;
+
+ return;
+
+}
+
+//_____________________________________________________________________________
+void AliTRDclusterizer::DeConvExp(Double_t *source, Double_t *target
+ , Int_t n, Int_t nexp)
+{
+ //
+ // Tail cancellation by deconvolution for PASA v4 TRF
+ //
+
+ Double_t rates[2];
+ Double_t coefficients[2];
+
+ // Initialization (coefficient = alpha, rates = lambda)
+ Double_t r1 = 1.0;
+ Double_t r2 = 1.0;
+ Double_t c1 = 0.5;
+ Double_t c2 = 0.5;
+
+ if (nexp == 1) { // 1 Exponentials
+ r1 = 1.156;
+ r2 = 0.130;
+ c1 = 0.066;
+ c2 = 0.000;
+ }
+ if (nexp == 2) { // 2 Exponentials
+ r1 = 1.156;
+ r2 = 0.130;
+ c1 = 0.114;
+ c2 = 0.624;
+ }
+
+ coefficients[0] = c1;
+ coefficients[1] = c2;
+
+ Double_t dt = 0.1;
+
+ rates[0] = TMath::Exp(-dt/(r1));
+ rates[1] = TMath::Exp(-dt/(r2));
+
+ Int_t i = 0;
+ Int_t k = 0;
+
+ Double_t reminder[2];
+ Double_t correction = 0.0;
+ Double_t result = 0.0;
+
+ // Attention: computation order is important
+ for (k = 0; k < nexp; k++) {
+ reminder[k] = 0.0;
+ }
+
+ for (i = 0; i < n; i++) {
+
+ result = (source[i] - correction); // No rescaling
+ target[i] = result;
+
+ for (k = 0; k < nexp; k++) {
+ reminder[k] = rates[k] * (reminder[k] + coefficients[k] * result);
+ }
+
+ correction = 0.0;
+ for (k = 0; k < nexp; k++) {
+ correction += reminder[k];
+ }
+
+ }
}
}
//_____________________________________________________________________________
-TObjArray* AliTRDclusterizer::RecPoints()
+TObjArray *AliTRDclusterizer::RecPoints()
{
//
// Returns the list of rec points
return fRecPoints;
}
+
+//_____________________________________________________________________________
+void AliTRDclusterizer::FillLUT()
+{
+ //
+ // Create the LUT
+ //
+
+ const Int_t kNlut = 128;
+
+ fLUTbin = AliTRDgeometry::kNplan * kNlut;
+
+ // The lookup table from Bogdan
+ Float_t lut[AliTRDgeometry::kNplan][kNlut] = {
+ {
+ 0.0070, 0.0150, 0.0224, 0.0298, 0.0374, 0.0454, 0.0533, 0.0611,
+ 0.0684, 0.0755, 0.0827, 0.0900, 0.0975, 0.1049, 0.1120, 0.1187,
+ 0.1253, 0.1318, 0.1385, 0.1453, 0.1519, 0.1584, 0.1646, 0.1704,
+ 0.1762, 0.1821, 0.1879, 0.1938, 0.1996, 0.2053, 0.2108, 0.2160,
+ 0.2210, 0.2260, 0.2310, 0.2361, 0.2411, 0.2461, 0.2509, 0.2557,
+ 0.2602, 0.2646, 0.2689, 0.2732, 0.2774, 0.2816, 0.2859, 0.2901,
+ 0.2942, 0.2983, 0.3022, 0.3061, 0.3099, 0.3136, 0.3172, 0.3207,
+ 0.3242, 0.3278, 0.3312, 0.3347, 0.3382, 0.3416, 0.3450, 0.3483,
+ 0.3515, 0.3547, 0.3579, 0.3609, 0.3639, 0.3669, 0.3698, 0.3727,
+ 0.3756, 0.3785, 0.3813, 0.3842, 0.3870, 0.3898, 0.3926, 0.3952,
+ 0.3979, 0.4005, 0.4032, 0.4057, 0.4082, 0.4108, 0.4132, 0.4157,
+ 0.4181, 0.4205, 0.4228, 0.4252, 0.4275, 0.4299, 0.4322, 0.4345,
+ 0.4367, 0.4390, 0.4412, 0.4434, 0.4456, 0.4478, 0.4499, 0.4520,
+ 0.4541, 0.4562, 0.4583, 0.4603, 0.4623, 0.4643, 0.4663, 0.4683,
+ 0.4702, 0.4722, 0.4741, 0.4758, 0.4774, 0.4790, 0.4805, 0.4824,
+ 0.4844, 0.4863, 0.4883, 0.4902, 0.4921, 0.4940, 0.4959, 0.4978
+ },
+ {
+ 0.0072, 0.0156, 0.0235, 0.0313, 0.0394, 0.0478, 0.0561, 0.0642,
+ 0.0718, 0.0792, 0.0868, 0.0947, 0.1025, 0.1101, 0.1172, 0.1241,
+ 0.1309, 0.1378, 0.1449, 0.1518, 0.1586, 0.1650, 0.1710, 0.1770,
+ 0.1830, 0.1891, 0.1952, 0.2011, 0.2070, 0.2125, 0.2177, 0.2229,
+ 0.2280, 0.2332, 0.2383, 0.2435, 0.2484, 0.2533, 0.2581, 0.2627,
+ 0.2670, 0.2714, 0.2757, 0.2799, 0.2842, 0.2884, 0.2927, 0.2968,
+ 0.3008, 0.3048, 0.3086, 0.3123, 0.3159, 0.3195, 0.3231, 0.3266,
+ 0.3301, 0.3335, 0.3370, 0.3404, 0.3438, 0.3471, 0.3504, 0.3536,
+ 0.3567, 0.3598, 0.3628, 0.3657, 0.3686, 0.3715, 0.3744, 0.3772,
+ 0.3800, 0.3828, 0.3856, 0.3884, 0.3911, 0.3938, 0.3965, 0.3991,
+ 0.4016, 0.4042, 0.4067, 0.4092, 0.4116, 0.4140, 0.4164, 0.4187,
+ 0.4211, 0.4234, 0.4257, 0.4280, 0.4302, 0.4325, 0.4347, 0.4369,
+ 0.4391, 0.4413, 0.4434, 0.4456, 0.4477, 0.4497, 0.4518, 0.4538,
+ 0.4558, 0.4578, 0.4598, 0.4618, 0.4637, 0.4656, 0.4675, 0.4694,
+ 0.4713, 0.4732, 0.4750, 0.4766, 0.4781, 0.4797, 0.4813, 0.4832,
+ 0.4851, 0.4870, 0.4888, 0.4906, 0.4925, 0.4942, 0.4960, 0.4978
+ },
+ {
+ 0.0075, 0.0163, 0.0246, 0.0328, 0.0415, 0.0504, 0.0592, 0.0674,
+ 0.0753, 0.0832, 0.0914, 0.0996, 0.1077, 0.1154, 0.1225, 0.1296,
+ 0.1369, 0.1442, 0.1515, 0.1585, 0.1652, 0.1714, 0.1776, 0.1839,
+ 0.1902, 0.1965, 0.2025, 0.2085, 0.2141, 0.2194, 0.2247, 0.2299,
+ 0.2352, 0.2405, 0.2457, 0.2507, 0.2557, 0.2604, 0.2649, 0.2693,
+ 0.2737, 0.2780, 0.2823, 0.2867, 0.2909, 0.2951, 0.2992, 0.3033,
+ 0.3072, 0.3110, 0.3146, 0.3182, 0.3218, 0.3253, 0.3288, 0.3323,
+ 0.3357, 0.3392, 0.3426, 0.3459, 0.3492, 0.3524, 0.3555, 0.3586,
+ 0.3616, 0.3645, 0.3674, 0.3703, 0.3731, 0.3759, 0.3787, 0.3815,
+ 0.3843, 0.3870, 0.3897, 0.3925, 0.3950, 0.3976, 0.4002, 0.4027,
+ 0.4052, 0.4076, 0.4101, 0.4124, 0.4148, 0.4171, 0.4194, 0.4217,
+ 0.4239, 0.4262, 0.4284, 0.4306, 0.4328, 0.4350, 0.4371, 0.4393,
+ 0.4414, 0.4435, 0.4455, 0.4476, 0.4496, 0.4516, 0.4536, 0.4555,
+ 0.4575, 0.4594, 0.4613, 0.4632, 0.4650, 0.4669, 0.4687, 0.4705,
+ 0.4723, 0.4741, 0.4758, 0.4773, 0.4789, 0.4804, 0.4821, 0.4839,
+ 0.4857, 0.4875, 0.4893, 0.4910, 0.4928, 0.4945, 0.4961, 0.4978
+ },
+ {
+ 0.0078, 0.0171, 0.0258, 0.0345, 0.0438, 0.0532, 0.0624, 0.0708,
+ 0.0791, 0.0875, 0.0962, 0.1048, 0.1130, 0.1206, 0.1281, 0.1356,
+ 0.1432, 0.1508, 0.1582, 0.1651, 0.1716, 0.1780, 0.1845, 0.1910,
+ 0.1975, 0.2038, 0.2099, 0.2155, 0.2210, 0.2263, 0.2317, 0.2371,
+ 0.2425, 0.2477, 0.2528, 0.2578, 0.2626, 0.2671, 0.2715, 0.2759,
+ 0.2803, 0.2846, 0.2890, 0.2933, 0.2975, 0.3016, 0.3056, 0.3095,
+ 0.3132, 0.3168, 0.3204, 0.3239, 0.3274, 0.3309, 0.3344, 0.3378,
+ 0.3412, 0.3446, 0.3479, 0.3511, 0.3543, 0.3574, 0.3603, 0.3633,
+ 0.3662, 0.3690, 0.3718, 0.3747, 0.3774, 0.3802, 0.3829, 0.3857,
+ 0.3883, 0.3910, 0.3936, 0.3962, 0.3987, 0.4012, 0.4037, 0.4061,
+ 0.4085, 0.4109, 0.4132, 0.4155, 0.4177, 0.4200, 0.4222, 0.4244,
+ 0.4266, 0.4288, 0.4309, 0.4331, 0.4352, 0.4373, 0.4394, 0.4414,
+ 0.4435, 0.4455, 0.4475, 0.4494, 0.4514, 0.4533, 0.4552, 0.4571,
+ 0.4590, 0.4608, 0.4626, 0.4645, 0.4662, 0.4680, 0.4698, 0.4715,
+ 0.4733, 0.4750, 0.4766, 0.4781, 0.4796, 0.4812, 0.4829, 0.4846,
+ 0.4863, 0.4880, 0.4897, 0.4914, 0.4930, 0.4946, 0.4963, 0.4979
+ },
+ {
+ 0.0081, 0.0178, 0.0270, 0.0364, 0.0463, 0.0562, 0.0656, 0.0744,
+ 0.0831, 0.0921, 0.1013, 0.1102, 0.1183, 0.1261, 0.1339, 0.1419,
+ 0.1499, 0.1576, 0.1648, 0.1715, 0.1782, 0.1849, 0.1917, 0.1984,
+ 0.2048, 0.2110, 0.2167, 0.2223, 0.2278, 0.2333, 0.2389, 0.2444,
+ 0.2497, 0.2548, 0.2598, 0.2645, 0.2691, 0.2735, 0.2780, 0.2824,
+ 0.2868, 0.2912, 0.2955, 0.2997, 0.3038, 0.3078, 0.3116, 0.3152,
+ 0.3188, 0.3224, 0.3259, 0.3294, 0.3329, 0.3364, 0.3398, 0.3432,
+ 0.3465, 0.3497, 0.3529, 0.3561, 0.3591, 0.3620, 0.3649, 0.3677,
+ 0.3705, 0.3733, 0.3761, 0.3788, 0.3816, 0.3843, 0.3869, 0.3896,
+ 0.3922, 0.3948, 0.3973, 0.3998, 0.4022, 0.4047, 0.4070, 0.4094,
+ 0.4117, 0.4139, 0.4162, 0.4184, 0.4206, 0.4227, 0.4249, 0.4270,
+ 0.4291, 0.4313, 0.4334, 0.4354, 0.4375, 0.4395, 0.4415, 0.4435,
+ 0.4455, 0.4474, 0.4493, 0.4512, 0.4531, 0.4550, 0.4568, 0.4586,
+ 0.4604, 0.4622, 0.4639, 0.4657, 0.4674, 0.4691, 0.4708, 0.4725,
+ 0.4742, 0.4758, 0.4773, 0.4788, 0.4803, 0.4819, 0.4836, 0.4852,
+ 0.4869, 0.4885, 0.4901, 0.4917, 0.4933, 0.4948, 0.4964, 0.4979
+ },
+ {
+ 0.0085, 0.0189, 0.0288, 0.0389, 0.0497, 0.0603, 0.0699, 0.0792,
+ 0.0887, 0.0985, 0.1082, 0.1170, 0.1253, 0.1336, 0.1421, 0.1505,
+ 0.1587, 0.1662, 0.1733, 0.1803, 0.1874, 0.1945, 0.2014, 0.2081,
+ 0.2143, 0.2201, 0.2259, 0.2316, 0.2374, 0.2431, 0.2487, 0.2541,
+ 0.2593, 0.2642, 0.2689, 0.2735, 0.2781, 0.2826, 0.2872, 0.2917,
+ 0.2961, 0.3003, 0.3045, 0.3086, 0.3125, 0.3162, 0.3198, 0.3235,
+ 0.3270, 0.3306, 0.3342, 0.3377, 0.3411, 0.3446, 0.3479, 0.3511,
+ 0.3543, 0.3575, 0.3605, 0.3634, 0.3663, 0.3691, 0.3720, 0.3748,
+ 0.3775, 0.3803, 0.3830, 0.3857, 0.3884, 0.3911, 0.3937, 0.3962,
+ 0.3987, 0.4012, 0.4036, 0.4060, 0.4084, 0.4107, 0.4129, 0.4152,
+ 0.4174, 0.4196, 0.4218, 0.4239, 0.4261, 0.4282, 0.4303, 0.4324,
+ 0.4344, 0.4365, 0.4385, 0.4405, 0.4425, 0.4445, 0.4464, 0.4483,
+ 0.4502, 0.4521, 0.4539, 0.4558, 0.4576, 0.4593, 0.4611, 0.4629,
+ 0.4646, 0.4663, 0.4680, 0.4697, 0.4714, 0.4730, 0.4747, 0.4759,
+ 0.4769, 0.4780, 0.4790, 0.4800, 0.4811, 0.4827, 0.4843, 0.4859,
+ 0.4874, 0.4889, 0.4905, 0.4920, 0.4935, 0.4950, 0.4965, 0.4979
+ }
+ };
+
+ if (fLUT) {
+ delete [] fLUT;
+ }
+ fLUT = new Double_t[fLUTbin];
+
+ for (Int_t iplan = 0; iplan < AliTRDgeometry::kNplan; iplan++) {
+ for (Int_t ilut = 0; ilut < kNlut; ilut++ ) {
+ fLUT[iplan*kNlut+ilut] = lut[iplan][ilut];
+ }
+ }
+
+}
+
+//_____________________________________________________________________________
+Double_t AliTRDclusterizer::LUTposition(Int_t iplane, Double_t ampL
+ , Double_t ampC, Double_t ampR) const
+{
+ //
+ // Calculates the cluster position using the lookup table.
+ // Method provided by Bogdan Vulpescu.
+ //
+
+ const Int_t kNlut = 128;
+
+ Double_t pos;
+ Double_t x = 0.0;
+ Double_t xmin;
+ Double_t xmax;
+ Double_t xwid;
+
+ Int_t side = 0;
+ Int_t ix;
+
+ Double_t xMin[AliTRDgeometry::kNplan] = { 0.006492, 0.006377, 0.006258
+ , 0.006144, 0.006030, 0.005980 };
+ Double_t xMax[AliTRDgeometry::kNplan] = { 0.960351, 0.965870, 0.970445
+ , 0.974352, 0.977667, 0.996101 };
+
+ if (ampL > ampR) {
+ x = (ampL - ampR) / ampC;
+ side = -1;
+ }
+ else if (ampL < ampR) {
+ x = (ampR - ampL) / ampC;
+ side = +1;
+ }
+
+ if (ampL != ampR) {
+
+ xmin = xMin[iplane] + 0.000005;
+ xmax = xMax[iplane] - 0.000005;
+ xwid = (xmax - xmin) / 127.0;
+
+ if (x < xmin) {
+ pos = 0.0000;
+ }
+ else if (x > xmax) {
+ pos = side * 0.5000;
+ }
+ else {
+ ix = (Int_t) ((x - xmin) / xwid);
+ pos = side * fLUT[iplane*kNlut+ix];
+ }
+
+ }
+ else {
+
+ pos = 0.0;
+
+ }
+
+ return pos;
+
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff