[u/mrichter/AliRoot.git] / TRD / AliTRDclusterizerV1.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
// TRD cluster finder for the slow simulator. 
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TF1.h>
#include <TTree.h>
#include <TH1.h>
#include <TFile.h>

#include "AliRun.h"
#include "AliRunLoader.h"
#include "AliLoader.h"

#include "AliTRD.h"
#include "AliTRDclusterizerV1.h"
#include "AliTRDmatrix.h"
#include "AliTRDgeometry.h"
#include "AliTRDdigitizer.h"
#include "AliTRDdataArrayF.h"
#include "AliTRDdataArrayI.h"
#include "AliTRDdigitsManager.h"
#include "AliTRDparameter.h"

ClassImp(AliTRDclusterizerV1)

//_____________________________________________________________________________
AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer()
{
  //
  // AliTRDclusterizerV1 default constructor
  //

  fDigitsManager = 0;

}

//_____________________________________________________________________________
AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title)
                    :AliTRDclusterizer(name,title)
{
  //
  // AliTRDclusterizerV1 default constructor
  //

  fDigitsManager = new AliTRDdigitsManager();
  fDigitsManager->CreateArrays();

}

//_____________________________________________________________________________
AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
:AliTRDclusterizer(c)
{
  //
  // AliTRDclusterizerV1 copy constructor
  //

  ((AliTRDclusterizerV1 &) c).Copy(*this);

}

//_____________________________________________________________________________
AliTRDclusterizerV1::~AliTRDclusterizerV1()
{
  //
  // AliTRDclusterizerV1 destructor
  //

  if (fDigitsManager) {
    delete fDigitsManager;
    fDigitsManager = NULL;
  }

}

//_____________________________________________________________________________
AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
{
  //
  // Assignment operator
  //

  if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
  return *this;

}

//_____________________________________________________________________________
void AliTRDclusterizerV1::Copy(TObject &c)
{
  //
  // Copy function
  //

  ((AliTRDclusterizerV1 &) c).fDigitsManager = 0;

  AliTRDclusterizer::Copy(c);

}

//_____________________________________________________________________________
Bool_t AliTRDclusterizerV1::ReadDigits()
{
  //
  // Reads the digits arrays from the input aliroot file
  //

  if (!fRunLoader) {
    printf("<AliTRDclusterizerV1::ReadDigits> ");
    printf("No input file open\n");
    return kFALSE;
  }
  AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
  if (!loader->TreeD()) loader->LoadDigits();

  // Read in the digit arrays
  return (fDigitsManager->ReadDigits(loader->TreeD()));

}

//_____________________________________________________________________________
Bool_t AliTRDclusterizerV1::MakeClusters()
{
  //
  // Generates the cluster.
  //

  Int_t row, col, time;

  if (fTRD->IsVersion() != 1) {
    printf("<AliTRDclusterizerV1::MakeCluster> ");
    printf("TRD must be version 1 (slow simulator).\n");
    return kFALSE; 
  }

  // Get the geometry
  AliTRDgeometry *geo = fTRD->GetGeometry();

  // Create a default parameter class if none is defined
  if (!fPar) {
    fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
    printf("<AliTRDclusterizerV1::MakeCluster> ");
    printf("Create the default parameter object.\n");
  }

  Float_t timeBinSize = fPar->GetTimeBinSize();
  // Half of ampl.region
  const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.; 

  Float_t omegaTau = fPar->GetOmegaTau();
  if (fVerbose > 0) {
    printf("<AliTRDclusterizerV1::MakeCluster> ");
    printf("OmegaTau = %f \n",omegaTau);
    printf("<AliTRDclusterizerV1::MakeCluster> ");
    printf("Start creating clusters.\n");
  } 

  AliTRDdataArrayI *digits;
  AliTRDdataArrayI *track0;
  AliTRDdataArrayI *track1;
  AliTRDdataArrayI *track2; 

  // Threshold value for the maximum
  Int_t maxThresh = fPar->GetClusMaxThresh();   
  // Threshold value for the digit signal
  Int_t sigThresh = fPar->GetClusSigThresh();   

  // Iteration limit for unfolding procedure
  const Float_t kEpsilon = 0.01;             

  const Int_t   kNclus   = 3;  
  const Int_t   kNsig    = 5;
  const Int_t   kNtrack  = 3 * kNclus;

  Int_t   iType          = 0;
  Int_t   iUnfold        = 0;

  Float_t ratioLeft      = 1.0;
  Float_t ratioRight     = 1.0;

  Float_t padSignal[kNsig];   
  Float_t clusterSignal[kNclus];
  Float_t clusterPads[kNclus];   
  Int_t   clusterDigit[kNclus];
  Int_t   clusterTracks[kNtrack];   

  Int_t chamBeg = 0;
  Int_t chamEnd = AliTRDgeometry::Ncham();
  if (fTRD->GetSensChamber()  >= 0) {
    chamBeg = fTRD->GetSensChamber();
    chamEnd = chamBeg + 1;
  }
  Int_t planBeg = 0;
  Int_t planEnd = AliTRDgeometry::Nplan();
  if (fTRD->GetSensPlane()    >= 0) {
    planBeg = fTRD->GetSensPlane();
    planEnd = planBeg + 1;
  }
  Int_t sectBeg = 0;
  Int_t sectEnd = AliTRDgeometry::Nsect();

  // Start clustering in every chamber
  for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
    for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
      for (Int_t isect = sectBeg; isect < sectEnd; isect++) {

        if (fTRD->GetSensSector() >= 0) {
          Int_t sens1 = fTRD->GetSensSector();
          Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
          sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect())) 
                 * AliTRDgeometry::Nsect();
          if (sens1 < sens2) {
            if ((isect < sens1) || (isect >= sens2)) continue;
	  }
          else {
            if ((isect < sens1) && (isect >= sens2)) continue;
	  }
	}

        Int_t idet = geo->GetDetector(iplan,icham,isect);

        Int_t nClusters      = 0;
        Int_t nClusters2pad  = 0;
        Int_t nClusters3pad  = 0;
        Int_t nClusters4pad  = 0;
        Int_t nClusters5pad  = 0;
        Int_t nClustersLarge = 0;

        if (fVerbose > 0) {
          printf("<AliTRDclusterizerV1::MakeCluster> ");
          printf("Analyzing chamber %d, plane %d, sector %d.\n"
                ,icham,iplan,isect);
	}

        Int_t   nRowMax     = fPar->GetRowMax(iplan,icham,isect);
        Int_t   nColMax     = fPar->GetColMax(iplan);
        Int_t   nTimeBefore = fPar->GetTimeBefore();
        Int_t   nTimeTotal  = fPar->GetTimeTotal();  

        Float_t row0        = fPar->GetRow0(iplan,icham,isect);
        Float_t col0        = fPar->GetCol0(iplan);
        Float_t rowSize     = fPar->GetRowPadSize(iplan,icham,isect);
        Float_t colSize     = fPar->GetColPadSize(iplan);

        // Get the digits
        digits = fDigitsManager->GetDigits(idet);
        digits->Expand();
        track0 = fDigitsManager->GetDictionary(idet,0);
        track0->Expand();
        track1 = fDigitsManager->GetDictionary(idet,1);
        track1->Expand();
        track2 = fDigitsManager->GetDictionary(idet,2); 
        track2->Expand();

        // Loop through the chamber and find the maxima 
        for ( row = 0;  row <  nRowMax;    row++) {
	  //          for ( col = 2;  col <  nColMax;    col++) {
          for ( col = 4;  col <  nColMax-2;    col++) {
            for (time = 0; time < nTimeTotal; time++) {

              Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col  ,time));
              Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time));
              Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
 
	      // Look for the maximum
              if (signalM >= maxThresh) {
                if (((signalL >= sigThresh) &&
                     (signalL <  signalM))  ||
                    ((signalR >= sigThresh) &&
                     (signalR <  signalM))) {
                  // Maximum found, mark the position by a negative signal
                  digits->SetDataUnchecked(row,col-1,time,-signalM);
		}
	      }

            }  
          }    
        }      

        // Now check the maxima and calculate the cluster position
        for ( row = 0;  row <  nRowMax  ;  row++) {
          for (time = 0; time < nTimeTotal; time++) {
            for ( col = 1;  col <  nColMax-1;  col++) {

              // Maximum found ?             
              if (digits->GetDataUnchecked(row,col,time) < 0) {

                Int_t iPad;
                for (iPad = 0; iPad < kNclus; iPad++) {
                  Int_t iPadCol = col - 1 + iPad;
                  clusterSignal[iPad]     = TMath::Abs(digits->GetDataUnchecked(row
                                                                               ,iPadCol
                                                                               ,time));
                  clusterDigit[iPad]      = digits->GetIndexUnchecked(row,iPadCol,time);
                  clusterTracks[3*iPad  ] = track0->GetDataUnchecked(row,iPadCol,time) - 1;
		  clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1;
		  clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1;
                }

		// Count the number of pads in the cluster
                Int_t nPadCount = 0;
                Int_t ii        = 0;
                while (TMath::Abs(digits->GetDataUnchecked(row,col-ii  ,time))
                                                                  >= sigThresh) {
                  nPadCount++;
                  ii++;
                  if (col-ii   <        0) break;
		}
                ii = 0;
                while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time))
                                                                  >= sigThresh) {
                  nPadCount++;
                  ii++;
                  if (col+ii+1 >= nColMax) break;
		}

                nClusters++;
                switch (nPadCount) {
                case 2:
                  iType = 0;
                  nClusters2pad++;
                  break;
                case 3:
                  iType = 1;
                  nClusters3pad++;
                  break;
                case 4:
                  iType = 2;
                  nClusters4pad++;
                  break;
                case 5:
                  iType = 3;
                  nClusters5pad++;
                  break;
                default:
                  iType = 4;
                  nClustersLarge++;
                  break;
		};

		// Don't analyze large clusters
                //if (iType == 4) continue;

                // Look for 5 pad cluster with minimum in the middle
                Bool_t fivePadCluster = kFALSE;
                if (col < nColMax-3) {
                  if (digits->GetDataUnchecked(row,col+2,time) < 0) {
                    fivePadCluster = kTRUE;
	  	  }
                  if ((fivePadCluster) && (col < nColMax-5)) {
                    if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) {
                      fivePadCluster = kFALSE;
		    }
		  }
                  if ((fivePadCluster) && (col >         1)) {
                    if (digits->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;
                  iType   = 3;
                  iUnfold = 0;
		}

		// Unfold the 5 pad cluster
                if (fivePadCluster) {
                  for (iPad = 0; iPad < kNsig; iPad++) {
                    padSignal[iPad] = TMath::Abs(digits->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;
                  iType   = 3;
                  iUnfold = 1;
                }

                Float_t clusterCharge = clusterSignal[0]
                                      + clusterSignal[1]
                                      + clusterSignal[2];
                
		// The position of the cluster
                clusterPads[0] = row + 0.5;
		// Take the shift of the additional time bins into account
                clusterPads[2] = time - nTimeBefore + 0.5;

                if (fPar->LUTOn()) {

  		  // Calculate the position of the cluster by using the
		  // lookup table method
                  clusterPads[1] = col + 0.5
                                 + fPar->LUTposition(iplan,clusterSignal[0]
                                                          ,clusterSignal[1]
					                  ,clusterSignal[2]);

		}
		else {

  		  // Calculate the position of the cluster by using the
		  // center of gravity method
                  clusterPads[1] = col + 0.5 
                                 + (clusterSignal[2] - clusterSignal[0]) 
		                 / clusterCharge;

		}

                Float_t q0 = clusterSignal[0];
		Float_t q1 = clusterSignal[1];
                Float_t q2 = clusterSignal[2];
                Float_t clusterSigmaY2 = (q1*(q0+q2)+4*q0*q2) /
                                         (clusterCharge*clusterCharge);

                // Correct for ExB displacement
                if (fPar->ExBOn()) { 
                  Int_t   local_time_bin = (Int_t) clusterPads[2];
                  Float_t driftLength    = local_time_bin * timeBinSize + kAmWidth;
                  Float_t colSize        = fPar->GetColPadSize(iplan);
                  Float_t deltaY         = omegaTau*driftLength/colSize;
                  clusterPads[1]         = clusterPads[1] - deltaY;
                }
                                       
                if (fVerbose > 1) {
                  printf("-----------------------------------------------------------\n");
                  printf("Create cluster no. %d\n",nClusters);
                  printf("Position: row = %f, col = %f, time = %f\n",clusterPads[0]
			                                            ,clusterPads[1]
                                                                    ,clusterPads[2]);
                  printf("Indices: %d, %d, %d\n",clusterDigit[0]
			                        ,clusterDigit[1]
                                                ,clusterDigit[2]);
                  printf("Total charge = %f\n",clusterCharge);
                  printf("Tracks: pad0 %d, %d, %d\n",clusterTracks[0]
			                            ,clusterTracks[1]
                                                    ,clusterTracks[2]);
                  printf("        pad1 %d, %d, %d\n",clusterTracks[3]
			                            ,clusterTracks[4]
                                                    ,clusterTracks[5]);
                  printf("        pad2 %d, %d, %d\n",clusterTracks[6]
			                            ,clusterTracks[7]
                                                    ,clusterTracks[8]);
                  printf("Type = %d, Number of pads = %d\n",iType,nPadCount);
                }

		// Calculate the position and the error
                Float_t clusterPos[3];
                clusterPos[0] = clusterPads[1] * colSize + col0;
                clusterPos[1] = clusterPads[0] * rowSize + row0;
                clusterPos[2] = clusterPads[2];
                Float_t clusterSig[2];
                clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize;
                clusterSig[1] = rowSize * rowSize / 12.;

                // Add the cluster to the output array 
                fTRD->AddCluster(clusterPos
                                ,idet
                                ,clusterCharge
                                ,clusterTracks
				,clusterSig
                                ,iType);

              }
            } 
          }   
        }     

	// Compress the arrays
        digits->Compress(1,0);
        track0->Compress(1,0);
        track1->Compress(1,0);
        track2->Compress(1,0);

        // Write the cluster and reset the array
	WriteClusters(idet);
	fTRD->ResetRecPoints();

        if (fVerbose > 0) {
          printf("<AliTRDclusterizerV1::MakeCluster> ");
          printf("Found %d clusters in total.\n"
                ,nClusters);
          printf("                                    2pad:  %d\n",nClusters2pad);
          printf("                                    3pad:  %d\n",nClusters3pad);
          printf("                                    4pad:  %d\n",nClusters4pad);
          printf("                                    5pad:  %d\n",nClusters5pad);
          printf("                                    Large: %d\n",nClustersLarge);
	}

      }    
    }      
  }        

  if (fVerbose > 0) {
    printf("<AliTRDclusterizerV1::MakeCluster> ");
    printf("Done.\n");
  }

  return kTRUE;

}

//_____________________________________________________________________________
Float_t AliTRDclusterizerV1::Unfold(Float_t eps, Int_t plane, Float_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.
  //

  Int_t   irc               = 0;
  Int_t   itStep            = 0;      // Count iteration steps

  Float_t ratio             = 0.5;    // Start value for ratio
  Float_t prevRatio         = 0;      // Store previous ratio

  Float_t newLeftSignal[3]  = {0};    // Array to store left cluster signal
  Float_t newRightSignal[3] = {0};    // Array to store right cluster signal
  Float_t newSignal[3]      = {0};

  // Start the iteration
  while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {

    itStep++;
    prevRatio = ratio;

    // Cluster position according to charge ratio
    Float_t maxLeft  = (ratio*padSignal[2] - padSignal[0]) 
                     / (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
    Float_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2]) 
                     / ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);

    // Set cluster charge ratio
    irc = fPar->PadResponse(1.0,maxLeft ,plane,newSignal);
    Float_t ampLeft  = padSignal[1] / newSignal[1];
    irc = fPar->PadResponse(1.0,maxRight,plane,newSignal);
    Float_t ampRight = padSignal[3] / newSignal[1];

    // Apply pad response to parameters
    irc = fPar->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
    irc = fPar->PadResponse(ampRight,maxRight,plane,newRightSignal);

    // Calculate new overlapping ratio
    ratio = TMath::Min((Float_t)1.0,newLeftSignal[2] / 
                          (newLeftSignal[2] + newRightSignal[0]));

  }

  return ratio;

}
Commit	Line	Data
f7336fa3	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
88cb7938	16	/* $Id$ */
f7336fa3	17
	18	///////////////////////////////////////////////////////////////////////////////
	19	// //
	20	// TRD cluster finder for the slow simulator.
	21	// //
	22	///////////////////////////////////////////////////////////////////////////////
	23
	24	#include <TF1.h>
94de3818	25	#include <TTree.h>
793ff80c	26	#include <TH1.h>
a819a5f7	27	#include <TFile.h>
f7336fa3	28
793ff80c	29	#include "AliRun.h"
88cb7938	30	#include "AliRunLoader.h"
88cb7938	31	#include "AliLoader.h"
793ff80c	32
793ff80c	33	#include "AliTRD.h"
f7336fa3	34	#include "AliTRDclusterizerV1.h"
	35	#include "AliTRDmatrix.h"
	36	#include "AliTRDgeometry.h"
	37	#include "AliTRDdigitizer.h"
6f1e466d	38	#include "AliTRDdataArrayF.h"
793ff80c	39	#include "AliTRDdataArrayI.h"
793ff80c	40	#include "AliTRDdigitsManager.h"
17b26de4	41	#include "AliTRDparameter.h"
f7336fa3	42
	43	ClassImp(AliTRDclusterizerV1)
	44
	45	//_____________________________________________________________________________
	46	AliTRDclusterizerV1::AliTRDclusterizerV1():AliTRDclusterizer()
	47	{
	48	//
	49	// AliTRDclusterizerV1 default constructor
	50	//
	51
17b26de4	52	fDigitsManager = 0;
db30bf0f	53
f7336fa3	54	}
	55
	56	//_____________________________________________________________________________
	57	AliTRDclusterizerV1::AliTRDclusterizerV1(const Text_t* name, const Text_t* title)
	58	:AliTRDclusterizer(name,title)
	59	{
	60	//
	61	// AliTRDclusterizerV1 default constructor
	62	//
	63
6f1e466d	64	fDigitsManager = new AliTRDdigitsManager();
17b26de4	65	fDigitsManager->CreateArrays();
f7336fa3	66
	67	}
	68
8230f242	69	//_____________________________________________________________________________
dd9a6ee3	70	AliTRDclusterizerV1::AliTRDclusterizerV1(const AliTRDclusterizerV1 &c)
73ae7b59	71	:AliTRDclusterizer(c)
8230f242	72	{
	73	//
	74	// AliTRDclusterizerV1 copy constructor
	75	//
	76
dd9a6ee3	77	((AliTRDclusterizerV1 &) c).Copy(*this);
8230f242	78
	79	}
	80
f7336fa3	81	//_____________________________________________________________________________
	82	AliTRDclusterizerV1::~AliTRDclusterizerV1()
	83	{
8230f242	84	//
	85	// AliTRDclusterizerV1 destructor
	86	//
f7336fa3	87
6f1e466d	88	if (fDigitsManager) {
6f1e466d	89	delete fDigitsManager;
abaf1f1d	90	fDigitsManager = NULL;
f7336fa3	91	}
	92
	93	}
	94
dd9a6ee3	95	//_____________________________________________________________________________
	96	AliTRDclusterizerV1 &AliTRDclusterizerV1::operator=(const AliTRDclusterizerV1 &c)
	97	{
	98	//
	99	// Assignment operator
	100	//
	101
	102	if (this != &c) ((AliTRDclusterizerV1 &) c).Copy(*this);
	103	return *this;
	104
	105	}
	106
8230f242	107	//_____________________________________________________________________________
43da34c0	108	void AliTRDclusterizerV1::Copy(TObject &c)
8230f242	109	{
	110	//
	111	// Copy function
	112	//
	113
17b26de4	114	((AliTRDclusterizerV1 &) c).fDigitsManager = 0;
8230f242	115
	116	AliTRDclusterizer::Copy(c);
	117
	118	}
	119
f7336fa3	120	//_____________________________________________________________________________
	121	Bool_t AliTRDclusterizerV1::ReadDigits()
	122	{
	123	//
	124	// Reads the digits arrays from the input aliroot file
	125	//
	126
88cb7938	127	if (!fRunLoader) {
17b26de4	128	printf("<AliTRDclusterizerV1::ReadDigits> ");
f7336fa3	129	printf("No input file open\n");
	130	return kFALSE;
	131	}
88cb7938	132	AliLoader* loader = fRunLoader->GetLoader("TRDLoader");
88cb7938	133	if (!loader->TreeD()) loader->LoadDigits();
abaf1f1d	134
f7336fa3	135	// Read in the digit arrays
88cb7938	136	return (fDigitsManager->ReadDigits(loader->TreeD()));
f7336fa3	137
	138	}
	139
	140	//_____________________________________________________________________________
793ff80c	141	Bool_t AliTRDclusterizerV1::MakeClusters()
f7336fa3	142	{
	143	//
	144	// Generates the cluster.
	145	//
	146
	147	Int_t row, col, time;
	148
3e1a3ad8	149	if (fTRD->IsVersion() != 1) {
17b26de4	150	printf("<AliTRDclusterizerV1::MakeCluster> ");
f7336fa3	151	printf("TRD must be version 1 (slow simulator).\n");
	152	return kFALSE;
	153	}
	154
	155	// Get the geometry
3e1a3ad8	156	AliTRDgeometry *geo = fTRD->GetGeometry();
f7336fa3	157
17b26de4	158	// Create a default parameter class if none is defined
	159	if (!fPar) {
	160	fPar = new AliTRDparameter("TRDparameter","Standard TRD parameter");
5443e65e	161	printf("<AliTRDclusterizerV1::MakeCluster> ");
5443e65e	162	printf("Create the default parameter object.\n");
17b26de4	163	}
	164
	165	Float_t timeBinSize = fPar->GetTimeBinSize();
a819a5f7	166	// Half of ampl.region
	167	const Float_t kAmWidth = AliTRDgeometry::AmThick()/2.;
	168
17b26de4	169	Float_t omegaTau = fPar->GetOmegaTau();
47517f42	170	if (fVerbose > 0) {
17b26de4	171	printf("<AliTRDclusterizerV1::MakeCluster> ");
47517f42	172	printf("OmegaTau = %f \n",omegaTau);
17b26de4	173	printf("<AliTRDclusterizerV1::MakeCluster> ");
47517f42	174	printf("Start creating clusters.\n");
47517f42	175	}
f7336fa3	176
8230f242	177	AliTRDdataArrayI *digits;
793ff80c	178	AliTRDdataArrayI *track0;
	179	AliTRDdataArrayI *track1;
	180	AliTRDdataArrayI *track2;
f7336fa3	181
3e1a3ad8	182	// Threshold value for the maximum
17b26de4	183	Int_t maxThresh = fPar->GetClusMaxThresh();
3e1a3ad8	184	// Threshold value for the digit signal
17b26de4	185	Int_t sigThresh = fPar->GetClusSigThresh();
f7336fa3	186
f7336fa3	187	// Iteration limit for unfolding procedure
8230f242	188	const Float_t kEpsilon = 0.01;
f7336fa3	189
8230f242	190	const Int_t kNclus = 3;
8230f242	191	const Int_t kNsig = 5;
3e1a3ad8	192	const Int_t kNtrack = 3 * kNclus;
3e1a3ad8	193
db30bf0f	194	Int_t iType = 0;
	195	Int_t iUnfold = 0;
	196
	197	Float_t ratioLeft = 1.0;
	198	Float_t ratioRight = 1.0;
	199
3e1a3ad8	200	Float_t padSignal[kNsig];
	201	Float_t clusterSignal[kNclus];
	202	Float_t clusterPads[kNclus];
	203	Int_t clusterDigit[kNclus];
	204	Int_t clusterTracks[kNtrack];
f7336fa3	205
f7336fa3	206	Int_t chamBeg = 0;
793ff80c	207	Int_t chamEnd = AliTRDgeometry::Ncham();
3e1a3ad8	208	if (fTRD->GetSensChamber() >= 0) {
3e1a3ad8	209	chamBeg = fTRD->GetSensChamber();
6f1e466d	210	chamEnd = chamBeg + 1;
f7336fa3	211	}
f7336fa3	212	Int_t planBeg = 0;
793ff80c	213	Int_t planEnd = AliTRDgeometry::Nplan();
3e1a3ad8	214	if (fTRD->GetSensPlane() >= 0) {
3e1a3ad8	215	planBeg = fTRD->GetSensPlane();
f7336fa3	216	planEnd = planBeg + 1;
	217	}
	218	Int_t sectBeg = 0;
793ff80c	219	Int_t sectEnd = AliTRDgeometry::Nsect();
f7336fa3	220
3e1a3ad8	221	// Start clustering in every chamber
f7336fa3	222	for (Int_t icham = chamBeg; icham < chamEnd; icham++) {
	223	for (Int_t iplan = planBeg; iplan < planEnd; iplan++) {
	224	for (Int_t isect = sectBeg; isect < sectEnd; isect++) {
	225
3e1a3ad8	226	if (fTRD->GetSensSector() >= 0) {
	227	Int_t sens1 = fTRD->GetSensSector();
	228	Int_t sens2 = sens1 + fTRD->GetSensSectorRange();
793ff80c	229	sens2 -= ((Int_t) (sens2 / AliTRDgeometry::Nsect()))
793ff80c	230	* AliTRDgeometry::Nsect();
dd9a6ee3	231	if (sens1 < sens2) {
9d0b222b	232	if ((isect < sens1) \|\| (isect >= sens2)) continue;
dd9a6ee3	233	}
dd9a6ee3	234	else {
9d0b222b	235	if ((isect < sens1) && (isect >= sens2)) continue;
dd9a6ee3	236	}
9d0b222b	237	}
9d0b222b	238
8230f242	239	Int_t idet = geo->GetDetector(iplan,icham,isect);
f7336fa3	240
db30bf0f	241	Int_t nClusters = 0;
	242	Int_t nClusters2pad = 0;
	243	Int_t nClusters3pad = 0;
	244	Int_t nClusters4pad = 0;
	245	Int_t nClusters5pad = 0;
	246	Int_t nClustersLarge = 0;
3e1a3ad8	247
47517f42	248	if (fVerbose > 0) {
17b26de4	249	printf("<AliTRDclusterizerV1::MakeCluster> ");
47517f42	250	printf("Analyzing chamber %d, plane %d, sector %d.\n"
	251	,icham,iplan,isect);
	252	}
f7336fa3	253
5443e65e	254	Int_t nRowMax = fPar->GetRowMax(iplan,icham,isect);
	255	Int_t nColMax = fPar->GetColMax(iplan);
	256	Int_t nTimeBefore = fPar->GetTimeBefore();
	257	Int_t nTimeTotal = fPar->GetTimeTotal();
	258
	259	Float_t row0 = fPar->GetRow0(iplan,icham,isect);
	260	Float_t col0 = fPar->GetCol0(iplan);
	261	Float_t rowSize = fPar->GetRowPadSize(iplan,icham,isect);
	262	Float_t colSize = fPar->GetColPadSize(iplan);
f7336fa3	263
3e1a3ad8	264	// Get the digits
8230f242	265	digits = fDigitsManager->GetDigits(idet);
3e1a3ad8	266	digits->Expand();
793ff80c	267	track0 = fDigitsManager->GetDictionary(idet,0);
3e1a3ad8	268	track0->Expand();
793ff80c	269	track1 = fDigitsManager->GetDictionary(idet,1);
3e1a3ad8	270	track1->Expand();
793ff80c	271	track2 = fDigitsManager->GetDictionary(idet,2);
3e1a3ad8	272	track2->Expand();
	273
	274	// Loop through the chamber and find the maxima
	275	for ( row = 0; row < nRowMax; row++) {
95d99e62	276	// for ( col = 2; col < nColMax; col++) {
95d99e62	277	for ( col = 4; col < nColMax-2; col++) {
3e1a3ad8	278	for (time = 0; time < nTimeTotal; time++) {
3e1a3ad8	279
a819a5f7	280	Int_t signalL = TMath::Abs(digits->GetDataUnchecked(row,col ,time));
	281	Int_t signalM = TMath::Abs(digits->GetDataUnchecked(row,col-1,time));
	282	Int_t signalR = TMath::Abs(digits->GetDataUnchecked(row,col-2,time));
3e1a3ad8	283
3e1a3ad8	284	// Look for the maximum
db30bf0f	285	if (signalM >= maxThresh) {
	286	if (((signalL >= sigThresh) &&
	287	(signalL < signalM)) \|\|
	288	((signalR >= sigThresh) &&
	289	(signalR < signalM))) {
3e1a3ad8	290	// Maximum found, mark the position by a negative signal
	291	digits->SetDataUnchecked(row,col-1,time,-signalM);
	292	}
	293	}
	294
	295	}
	296	}
	297	}
	298
	299	// Now check the maxima and calculate the cluster position
	300	for ( row = 0; row < nRowMax ; row++) {
db30bf0f	301	for (time = 0; time < nTimeTotal; time++) {
db30bf0f	302	for ( col = 1; col < nColMax-1; col++) {
3e1a3ad8	303
	304	// Maximum found ?
	305	if (digits->GetDataUnchecked(row,col,time) < 0) {
f7336fa3	306
9d0b222b	307	Int_t iPad;
8230f242	308	for (iPad = 0; iPad < kNclus; iPad++) {
3e1a3ad8	309	Int_t iPadCol = col - 1 + iPad;
	310	clusterSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row
	311	,iPadCol
	312	,time));
	313	clusterDigit[iPad] = digits->GetIndexUnchecked(row,iPadCol,time);
	314	clusterTracks[3*iPad ] = track0->GetDataUnchecked(row,iPadCol,time) - 1;
	315	clusterTracks[3*iPad+1] = track1->GetDataUnchecked(row,iPadCol,time) - 1;
	316	clusterTracks[3*iPad+2] = track2->GetDataUnchecked(row,iPadCol,time) - 1;
f7336fa3	317	}
f7336fa3	318
db30bf0f	319	// Count the number of pads in the cluster
	320	Int_t nPadCount = 0;
	321	Int_t ii = 0;
	322	while (TMath::Abs(digits->GetDataUnchecked(row,col-ii ,time))
	323	>= sigThresh) {
	324	nPadCount++;
	325	ii++;
	326	if (col-ii < 0) break;
	327	}
	328	ii = 0;
	329	while (TMath::Abs(digits->GetDataUnchecked(row,col+ii+1,time))
	330	>= sigThresh) {
	331	nPadCount++;
	332	ii++;
	333	if (col+ii+1 >= nColMax) break;
	334	}
	335
	336	nClusters++;
	337	switch (nPadCount) {
	338	case 2:
	339	iType = 0;
	340	nClusters2pad++;
	341	break;
	342	case 3:
	343	iType = 1;
	344	nClusters3pad++;
	345	break;
	346	case 4:
	347	iType = 2;
	348	nClusters4pad++;
	349	break;
	350	case 5:
	351	iType = 3;
	352	nClusters5pad++;
	353	break;
	354	default:
	355	iType = 4;
	356	nClustersLarge++;
	357	break;
	358	};
	359
	360	// Don't analyze large clusters
	361	//if (iType == 4) continue;
	362
	363	// Look for 5 pad cluster with minimum in the middle
	364	Bool_t fivePadCluster = kFALSE;
3e1a3ad8	365	if (col < nColMax-3) {
3e1a3ad8	366	if (digits->GetDataUnchecked(row,col+2,time) < 0) {
db30bf0f	367	fivePadCluster = kTRUE;
	368	}
	369	if ((fivePadCluster) && (col < nColMax-5)) {
	370	if (digits->GetDataUnchecked(row,col+4,time) >= sigThresh) {
	371	fivePadCluster = kFALSE;
	372	}
	373	}
	374	if ((fivePadCluster) && (col > 1)) {
	375	if (digits->GetDataUnchecked(row,col-2,time) >= sigThresh) {
	376	fivePadCluster = kFALSE;
	377	}
	378	}
	379	}
	380
	381	// 5 pad cluster
	382	// Modify the signal of the overlapping pad for the left part
	383	// of the cluster which remains from a previous unfolding
	384	if (iUnfold) {
	385	clusterSignal[0] *= ratioLeft;
	386	iType = 3;
	387	iUnfold = 0;
	388	}
	389
	390	// Unfold the 5 pad cluster
	391	if (fivePadCluster) {
	392	for (iPad = 0; iPad < kNsig; iPad++) {
	393	padSignal[iPad] = TMath::Abs(digits->GetDataUnchecked(row
	394	,col-1+iPad
	395	,time));
f7336fa3	396	}
db30bf0f	397	// Unfold the two maxima and set the signal on
db30bf0f	398	// the overlapping pad to the ratio
17b26de4	399	ratioRight = Unfold(kEpsilon,iplan,padSignal);
db30bf0f	400	ratioLeft = 1.0 - ratioRight;
	401	clusterSignal[2] *= ratioRight;
	402	iType = 3;
	403	iUnfold = 1;
f7336fa3	404	}
f7336fa3	405
3e1a3ad8	406	Float_t clusterCharge = clusterSignal[0]
	407	+ clusterSignal[1]
	408	+ clusterSignal[2];
	409
db30bf0f	410	// The position of the cluster
3e1a3ad8	411	clusterPads[0] = row + 0.5;
3e1a3ad8	412	// Take the shift of the additional time bins into account
	413	clusterPads[2] = time - nTimeBefore + 0.5;
	414
17b26de4	415	if (fPar->LUTOn()) {
db30bf0f	416
	417	// Calculate the position of the cluster by using the
	418	// lookup table method
5443e65e	419	clusterPads[1] = col + 0.5
5443e65e	420	+ fPar->LUTposition(iplan,clusterSignal[0]
17b26de4	421	,clusterSignal[1]
17b26de4	422	,clusterSignal[2]);
db30bf0f	423
	424	}
	425	else {
	426
	427	// Calculate the position of the cluster by using the
	428	// center of gravity method
	429	clusterPads[1] = col + 0.5
	430	+ (clusterSignal[2] - clusterSignal[0])
	431	/ clusterCharge;
	432
	433	}
	434
5443e65e	435	Float_t q0 = clusterSignal[0];
	436	Float_t q1 = clusterSignal[1];
	437	Float_t q2 = clusterSignal[2];
	438	Float_t clusterSigmaY2 = (q1(q0+q2)+4q0*q2) /
	439	(clusterCharge*clusterCharge);
a819a5f7	440
a819a5f7	441	// Correct for ExB displacement
17b26de4	442	if (fPar->ExBOn()) {
a819a5f7	443	Int_t local_time_bin = (Int_t) clusterPads[2];
a819a5f7	444	Float_t driftLength = local_time_bin * timeBinSize + kAmWidth;
17b26de4	445	Float_t colSize = fPar->GetColPadSize(iplan);
a819a5f7	446	Float_t deltaY = omegaTau*driftLength/colSize;
	447	clusterPads[1] = clusterPads[1] - deltaY;
	448	}
	449
47517f42	450	if (fVerbose > 1) {
3e1a3ad8	451	printf("-----------------------------------------------------------\n");
	452	printf("Create cluster no. %d\n",nClusters);
	453	printf("Position: row = %f, col = %f, time = %f\n",clusterPads[0]
	454	,clusterPads[1]
	455	,clusterPads[2]);
	456	printf("Indices: %d, %d, %d\n",clusterDigit[0]
	457	,clusterDigit[1]
	458	,clusterDigit[2]);
	459	printf("Total charge = %f\n",clusterCharge);
	460	printf("Tracks: pad0 %d, %d, %d\n",clusterTracks[0]
	461	,clusterTracks[1]
	462	,clusterTracks[2]);
	463	printf(" pad1 %d, %d, %d\n",clusterTracks[3]
	464	,clusterTracks[4]
	465	,clusterTracks[5]);
	466	printf(" pad2 %d, %d, %d\n",clusterTracks[6]
	467	,clusterTracks[7]
	468	,clusterTracks[8]);
db30bf0f	469	printf("Type = %d, Number of pads = %d\n",iType,nPadCount);
f7336fa3	470	}
f7336fa3	471
5443e65e	472	// Calculate the position and the error
	473	Float_t clusterPos[3];
	474	clusterPos[0] = clusterPads[1] * colSize + col0;
	475	clusterPos[1] = clusterPads[0] * rowSize + row0;
	476	clusterPos[2] = clusterPads[2];
	477	Float_t clusterSig[2];
	478	clusterSig[0] = (clusterSigmaY2 + 1./12.) * colSize*colSize;
	479	clusterSig[1] = rowSize * rowSize / 12.;
	480
f7336fa3	481	// Add the cluster to the output array
5443e65e	482	fTRD->AddCluster(clusterPos
3e1a3ad8	483	,idet
	484	,clusterCharge
	485	,clusterTracks
5443e65e	486	,clusterSig
3e1a3ad8	487	,iType);
f7336fa3	488
f7336fa3	489	}
3e1a3ad8	490	}
	491	}
	492	}
f7336fa3	493
3e1a3ad8	494	// Compress the arrays
	495	digits->Compress(1,0);
	496	track0->Compress(1,0);
	497	track1->Compress(1,0);
	498	track2->Compress(1,0);
f7336fa3	499
3e1a3ad8	500	// Write the cluster and reset the array
793ff80c	501	WriteClusters(idet);
3e1a3ad8	502	fTRD->ResetRecPoints();
793ff80c	503
47517f42	504	if (fVerbose > 0) {
17b26de4	505	printf("<AliTRDclusterizerV1::MakeCluster> ");
47517f42	506	printf("Found %d clusters in total.\n"
	507	,nClusters);
	508	printf(" 2pad: %d\n",nClusters2pad);
	509	printf(" 3pad: %d\n",nClusters3pad);
	510	printf(" 4pad: %d\n",nClusters4pad);
	511	printf(" 5pad: %d\n",nClusters5pad);
	512	printf(" Large: %d\n",nClustersLarge);
	513	}
f7336fa3	514
3e1a3ad8	515	}
	516	}
	517	}
f7336fa3	518
47517f42	519	if (fVerbose > 0) {
17b26de4	520	printf("<AliTRDclusterizerV1::MakeCluster> ");
47517f42	521	printf("Done.\n");
47517f42	522	}
f7336fa3	523
	524	return kTRUE;
	525
	526	}
	527
	528	//_____________________________________________________________________________
17b26de4	529	Float_t AliTRDclusterizerV1::Unfold(Float_t eps, Int_t plane, Float_t* padSignal)
f7336fa3	530	{
	531	//
	532	// Method to unfold neighbouring maxima.
	533	// The charge ratio on the overlapping pad is calculated
	534	// until there is no more change within the range given by eps.
	535	// The resulting ratio is then returned to the calling method.
	536	//
	537
17b26de4	538	Int_t irc = 0;
3e1a3ad8	539	Int_t itStep = 0; // Count iteration steps
f7336fa3	540
3e1a3ad8	541	Float_t ratio = 0.5; // Start value for ratio
3e1a3ad8	542	Float_t prevRatio = 0; // Store previous ratio
f7336fa3	543
3e1a3ad8	544	Float_t newLeftSignal[3] = {0}; // Array to store left cluster signal
3e1a3ad8	545	Float_t newRightSignal[3] = {0}; // Array to store right cluster signal
17b26de4	546	Float_t newSignal[3] = {0};
f7336fa3	547
3e1a3ad8	548	// Start the iteration
f7336fa3	549	while ((TMath::Abs(prevRatio - ratio) > eps) && (itStep < 10)) {
	550
	551	itStep++;
	552	prevRatio = ratio;
	553
3e1a3ad8	554	// Cluster position according to charge ratio
	555	Float_t maxLeft = (ratio*padSignal[2] - padSignal[0])
	556	/ (padSignal[0] + padSignal[1] + ratio*padSignal[2]);
	557	Float_t maxRight = (padSignal[4] - (1-ratio)*padSignal[2])
	558	/ ((1-ratio)*padSignal[2] + padSignal[3] + padSignal[4]);
f7336fa3	559
3e1a3ad8	560	// Set cluster charge ratio
17b26de4	561	irc = fPar->PadResponse(1.0,maxLeft ,plane,newSignal);
	562	Float_t ampLeft = padSignal[1] / newSignal[1];
	563	irc = fPar->PadResponse(1.0,maxRight,plane,newSignal);
	564	Float_t ampRight = padSignal[3] / newSignal[1];
f7336fa3	565
3e1a3ad8	566	// Apply pad response to parameters
17b26de4	567	irc = fPar->PadResponse(ampLeft ,maxLeft ,plane,newLeftSignal );
17b26de4	568	irc = fPar->PadResponse(ampRight,maxRight,plane,newRightSignal);
f7336fa3	569
3e1a3ad8	570	// Calculate new overlapping ratio
26edf6a4	571	ratio = TMath::Min((Float_t)1.0,newLeftSignal[2] /
db30bf0f	572	(newLeftSignal[2] + newRightSignal[0]));
f7336fa3	573
	574	}
	575
	576	return ratio;
	577
	578	}
	579