TRD/AliTRDtracker.h

   1 #ifndef ALITRDTRACKER_H
   2 #define ALITRDTRACKER_H
   3
   4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   5  * See cxx source for full Copyright notice                               */
   6
   7 /* $Id$ */
   8
   9 ////////////////////////////////////////////////////////////////////////////
  10 //                                                                        //
  11 //  The TRD tracker                                                       //
  12 //                                                                        //
  13 ////////////////////////////////////////////////////////////////////////////
  14
  15 #include "AliTracker.h"
  16 #include "TObjArray.h"
  17
  18 class TFile;
  19 class TTree;
  20 class TH1D;
  21 class TH2D;
  22 class TParticle;
  23 class TParticlePDG;
  24
  25 class AliTRDgeometry;
  26 class AliTRDtrack;
  27 class AliTRDtracklet;
  28 class AliTRDcluster;
  29 class AliTRDseed;
  30 class AliESDEvent;
  31 class TTreeSRedirector;
  32
  33 ///////////////////////////////////////////////////////////////////////////////
  34 //                                                                           //
  35 //  The standard TRD tracker                                                 //
  36 //  Based on Kalman filltering approach                                      //
  37 //                                                                           //
  38 ///////////////////////////////////////////////////////////////////////////////
  39
  40 class AliTRDtracker : public AliTracker {
  41
  42   // Histograms
  43   TH1D *fHBackfit;  // Histogram for back propagation
  44   TH1D *fHClSearch; // Cluster search
  45   TH1D *fHRefit;
  46
  47   TH1D *fHX;
  48   TH1D *fHNCl;
  49   TH1D *fHNClTrack;
  50   TH1D *fHFindCl[4];
  51   TH1D *fHMinYPos;
  52   TH1D *fHMinYNeg;
  53   TH1D *fHMinZ;
  54
  55   TH2D *fHMinD;
  56   TH1D *fHDeltaX;
  57   TH1D *fHXCl;
  58
  59   void InitLogHists();
  60   void SaveLogHists();
  61
  62  public:
  63
  64   enum { kMaxLayersPerSector   = 1000
  65        , kMaxTimeBinIndex      = 216
  66        , kMaxClusterPerTimeBin = 2300
  67        , kZones                = 5
  68        , kTrackingSectors      = 18   };
  69
  70   AliTRDtracker();
  71   AliTRDtracker(const AliTRDtracker &t);
  72   AliTRDtracker(const TFile *in);
  73   virtual         ~AliTRDtracker();
  74   AliTRDtracker   &operator=(const AliTRDtracker &/*t*/) { return *this;          }
  75
  76   void             SetAddTRDseeds()               { fAddTRDseeds = kTRUE;         }
  77   void             SetNoTilt()                    { fNoTilt      = kTRUE;         }
  78
  79   Int_t            GetTimeBinsPerPlane() const    { return fTimeBinsPerPlane;     }
  80   Double_t         GetMaxChi2() const             { return fgkMaxChi2;            }
  81   Float_t          GetLabelFraction() const       { return fgkLabelFraction;      }
  82   Float_t          GetMinClustersInTrack() const  { return fgkMinClustersInTrack; }
  83   Int_t            GetLastPlane(AliTRDtrack *track);
  84   Double_t         GetTiltFactor(const AliTRDcluster *c);
  85   Bool_t           GetTrackPoint(Int_t index, AliTrackPoint& p) const;
  86   Double_t         GetX(Int_t sec, Int_t plane, Int_t localTB) const;
  87   Double_t         GetX(Int_t sec, Int_t pl) const
  88                                                   { return fTrSec[sec]->GetLayer(pl)->GetX();            }
  89   Int_t            GetGlobalTimeBin(Int_t sec, Int_t plane, Int_t localTB) const
  90                                                   { return fTrSec[sec]->CookTimeBinIndex(plane,localTB); }
  91   Double_t         GetLayerNumber(Int_t sec, Double_t x) const
  92                                                   { return fTrSec[sec]->GetLayerNumber(x);               }
  93   AliCluster      *GetCluster(Int_t index) const  { if (index >= fNclusters) return NULL;
  94                                                     return (AliCluster *) fClusters->UncheckedAt(index); }
  95
  96   static Int_t     Freq(Int_t n, const Int_t *inlist, Int_t *outlist, Bool_t down);
  97   Int_t            Clusters2Tracks(AliESDEvent *event);
  98   Int_t            PropagateBack(AliESDEvent *event);
  99   Int_t            RefitInward(AliESDEvent *event);
 100
 101   virtual void     CookLabel(AliKalmanTrack *t, Float_t wrong) const;
 102
 103   Int_t            LocalToGlobalID(Int_t lid);
 104   Int_t            GlobalToLocalID(Int_t gid);
 105
 106   Int_t            LoadClusters(TTree *cTree);
 107   void             UnloadClusters();
 108   virtual void     UseClusters(const AliKalmanTrack *t, Int_t from = 0) const;
 109   Int_t            ReadClusters(TObjArray *array, TTree *in) const;
 110   AliTRDcluster   *GetCluster(AliTRDtrack *track, Int_t plane, Int_t timebin, UInt_t &index);
 111   Int_t            FindClusters(Int_t sector, Int_t t0, Int_t t1, AliTRDtrack *track
 112                               , Int_t *clusters, AliTRDtracklet &tracklet);
 113
 114  protected:
 115
 116   class AliTRDpropagationLayer {
 117
 118   public:
 119
 120     AliTRDpropagationLayer(Double_t x, Double_t dx, Double_t rho
 121                          , Double_t x0, Int_t tbIndex, Int_t plane);
 122     AliTRDpropagationLayer(const AliTRDpropagationLayer &/*p*/);
 123     ~AliTRDpropagationLayer() {  if (fTimeBinIndex >= 0) {
 124                                    delete[] fClusters;
 125                                    delete[] fIndex;
 126                                  }
 127                                }
 128     AliTRDpropagationLayer &operator=(const AliTRDpropagationLayer &/*p*/)
 129                                                               { return *this; }
 130
 131     operator Int_t() const                                    { return fN;    }
 132     AliTRDcluster  *operator[](Int_t i) {return fClusters[i];}
 133
 134     void     SetZmax(Int_t cham, Double_t center, Double_t w) { fZc[cham]      = center;
 135                                                                 fZmax[cham]    = w;           }
 136     void     SetYmax(Double_t w, Double_t wsensitive)         { fYmax          = w;
 137                                                                 fYmaxSensitive = wsensitive;  }
 138
 139     void     SetZ(Double_t* center, Double_t *w, Double_t *wsensitive);
 140     void     SetHoles(Bool_t* holes);
 141     void     SetHole(Double_t Zmax, Double_t Ymax
 142                    , Double_t rho = 1.29e-3, Double_t x0 = 36.66
 143                    , Double_t Yc = 0.0, Double_t Zc = 0.0);
 144
 145     Double_t GetYmax() const           { return fYmax;                  }
 146     Double_t GetZmax(Int_t c) const    { return fZmax[c];               }
 147     Double_t GetZc(Int_t c) const      { return fZc[c];                 }
 148     UInt_t   GetIndex(Int_t i) const   { return fIndex[i];              }
 149     Double_t GetX() const              { return fX;                     }
 150     Double_t GetdX() const             { return fdX;                    }
 151     Int_t    GetTimeBinIndex() const   { return fTimeBinIndex;          }
 152     Int_t    GetPlane() const          { return fPlane;                 }
 153     Bool_t   IsHole(Int_t zone) const  { return fIsHole[zone];          }
 154     Bool_t   IsSensitive() const       { return (fTimeBinIndex >= 0)? kTRUE : kFALSE;}
 155
 156     void     Clear() {
 157       for (Int_t i = 0; i < fN; i++) fClusters[i] = NULL;
 158       fN = 0;
 159     }
 160
 161     void     InsertCluster(AliTRDcluster *c, UInt_t index);
 162     Int_t    Find(Float_t y) const;
 163     Int_t    FindNearestCluster(Float_t y, Float_t z, Float_t maxroad, Float_t maxroadz) const;
 164
 165     void     SetX(Double_t x)          { fX = x; }
 166
 167
 168   private:
 169
 170     Int_t                     fN;                            // This is fN
 171     Int_t                     fSec;                          // Sector mumber
 172     AliTRDcluster           **fClusters;                     // Array of pointers to clusters
 173     UInt_t                   *fIndex;                        // Array of cluster indexes
 174     Double_t                  fX;                            // X coordinate of the middle plane
 175     Double_t                  fdX;                           // Radial thickness of the time bin
 176     Double_t                  fRho;                          // Default density of the material
 177     Double_t                  fX0;                           // Default radiation length
 178     Int_t                     fTimeBinIndex;                 // Plane * F(local_tb)
 179     Int_t                     fPlane;                        // Plane number
 180     Double_t                  fZc[kZones];                   // Z position of the center for 5 active areas
 181     Double_t                  fZmax[kZones];                 // Half of active area length in Z
 182     Double_t                  fZmaxSensitive[kZones];        // Sensitive area for detection Z
 183     Bool_t                    fIsHole[kZones];               // Is hole in given sector
 184     Double_t                  fYmax;                         // Half of active area length in Y
 185     Double_t                  fYmaxSensitive;                // Half of active area length in Y
 186
 187     Bool_t                    fHole;                         // kTRUE if there is a hole in the layer
 188     Double_t                  fHoleZc;                       // Z of the center of the hole
 189     Double_t                  fHoleZmax;                     // Half of the hole length in Z
 190     Double_t                  fHoleYc;                       // Y of the center of the hole
 191     Double_t                  fHoleYmax;                     // Half of the hole length in Y
 192     Double_t                  fHoleRho;                      // Density of the gas in the hole
 193     Double_t                  fHoleX0;                       // Radiation length of the gas in the hole
 194
 195   };
 196
 197   class AliTRDtrackingSector {
 198
 199    public:
 200
 201     AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs);
 202     AliTRDtrackingSector(const AliTRDtrackingSector &/*t*/);
 203     ~AliTRDtrackingSector() {
 204       for (Int_t i = 0; i < fN; i++) delete fLayers[i];
 205     }
 206
 207     AliTRDtrackingSector &operator=(const AliTRDtrackingSector &/*t*/){ return *this;}
 208
 209     Int_t    GetNumberOfLayers() const             { return fN;}
 210     Int_t    GetNumberOfTimeBins() const;
 211     Int_t    GetLayerNumber(Double_t x) const;
 212     Int_t    GetInnerTimeBin() const;
 213     Int_t    GetOuterTimeBin() const;
 214     Int_t    GetLayerNumber(Int_t tb) const        { return fTimeBinIndex[tb];}
 215     Double_t GetX(Int_t pl) const                  { return fLayers[pl]->GetX();}
 216     AliTRDpropagationLayer* GetLayer(Int_t i)      { return fLayers[i];}
 217
 218     void     MapTimeBinLayers();
 219     Int_t    Find(Double_t x) const;
 220     void     InsertLayer(AliTRDpropagationLayer *pl);
 221     Int_t    CookTimeBinIndex(Int_t plane, Int_t localTB) const;
 222
 223   private:
 224
 225     Int_t                   fN;                              // Total number of layers
 226     AliTRDgeometry         *fGeom;                           // Geometry
 227     AliTRDpropagationLayer *fLayers[kMaxLayersPerSector];    // Layers
 228     Int_t                   fTimeBinIndex[kMaxTimeBinIndex]; // Time bin index
 229     Int_t                   fGeomSector;                     // Sector# in AliTRDgeometry
 230
 231   };
 232
 233   AliTRDgeometry          *fGeom;                          // Pointer to TRD geometry
 234   AliTRDtrackingSector    *fTrSec[kTrackingSectors];       // Array of tracking sectors;
 235   Int_t                    fNclusters;                     // Number of clusters in TRD
 236   TObjArray               *fClusters;                      // List of clusters for all sectors
 237   Int_t                    fNseeds;                        // Number of track seeds
 238   TObjArray               *fSeeds;                         // List of track seeds
 239   Int_t                    fNtracks;                       // Number of reconstructed tracks
 240   TObjArray               *fTracks;                        // List of reconstructed tracks
 241   Int_t                    fTimeBinsPerPlane;              // Timebins per plane in track prolongation
 242
 243   static const Double_t    fgkMaxChi2;                     // Max increment in track chi2
 244   static const Float_t     fgkMinClustersInTrack;          // Min number of clusters in track
 245   static const Float_t     fgkLabelFraction;               // Min fraction of same label
 246   static const Double_t    fgkMaxSnp;                      // Maximal snp for tracking
 247   static const Double_t    fgkMaxStep;                     // Maximal step for tracking
 248
 249   Bool_t                   fAddTRDseeds;                   // Something else
 250   Bool_t                   fNoTilt;                        // No tilt, or what?
 251   Bool_t                   fHoles[5][18];                  // Holes
 252
 253   Bool_t   AdjustSector(AliTRDtrack *track);
 254
 255  private:
 256
 257   AliTRDtrack *RegisterSeed(AliTRDseed *seeds, Double_t *params);
 258   void     MakeSeedsMI(Int_t inner, Int_t outer, AliESDEvent *esd = 0);
 259
 260   Int_t    FollowBackProlongation(AliTRDtrack &t);
 261   Int_t    FollowProlongation(AliTRDtrack &t);
 262   Int_t    PropagateToX(AliTRDtrack &t, Double_t xToGo, Double_t maxStep);
 263   Double_t ExpectedSigmaY2(Double_t r, Double_t tgl, Double_t pt) const;
 264   Double_t ExpectedSigmaZ2(Double_t r, Double_t tgl) const;
 265
 266   TTreeSRedirector        *fDebugStreamer;                 //!Debug streamer
 267
 268   ClassDef(AliTRDtracker,2)                                        // TRD tracker
 269
 270  };
 271 #endif