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 "TObjArray.h"
  16
  17 #include "AliTracker.h"
  18
  19 class TFile;
  20 class TTree;
  21 class TH1D;
  22 class TH2D;
  23 class TParticle;
  24 class TParticlePDG;
  25 class TTreeSRedirector;
  26
  27 class AliTRDgeometry;
  28 class AliTRDtrack;
  29 class AliTRDtracklet;
  30 class AliTRDcluster;
  31 class AliTRDseed;
  32 class AliESDEvent;
  33
  34 ///////////////////////////////////////////////////////////////////////////////
  35 //                                                                           //
  36 //  The standard TRD tracker                                                 //
  37 //  Based on Kalman filltering approach                                      //
  38 //                                                                           //
  39 ///////////////////////////////////////////////////////////////////////////////
  40
  41 class AliTRDtracker : public AliTracker {
  42
  43  public:
  44
  45   // Histograms
  46   TH1D *fHBackfit;   // Histogram for back propagation
  47   TH1D *fHClSearch;  // Cluster search
  48   TH1D *fHRefit;     // ???
  49
  50   TH1D *fHX;         // ???
  51   TH1D *fHNCl;       // ???
  52   TH1D *fHNClTrack;  // ???
  53   TH1D *fHFindCl[4]; // ???
  54   TH1D *fHMinYPos;   // ???
  55   TH1D *fHMinYNeg;   // ???
  56   TH1D *fHMinZ;      // ???
  57
  58   TH2D *fHMinD;      // ???
  59   TH1D *fHDeltaX;    // ???
  60   TH1D *fHXCl;       // ???
  61
  62   void InitLogHists();
  63   void SaveLogHists();
  64
  65   enum { kMaxLayersPerSector   = 1000
  66        , kMaxTimeBinIndex      = 216
  67        , kMaxClusterPerTimeBin = 2300
  68        , kZones                = 5
  69        , kTrackingSectors      = 18   };
  70
  71   AliTRDtracker();
  72   AliTRDtracker(const AliTRDtracker &t);
  73   AliTRDtracker(const TFile *in);
  74   virtual         ~AliTRDtracker();
  75   AliTRDtracker   &operator=(const AliTRDtracker &/*t*/) { return *this;          }
  76
  77   void             SetAddTRDseeds()               { fAddTRDseeds = kTRUE;         }
  78   void             SetNoTilt()                    { fNoTilt      = kTRUE;         }
  79
  80   Int_t            GetTimeBinsPerPlane() const    { return fTimeBinsPerPlane;     }
  81   Double_t         GetMaxChi2() const             { return fgkMaxChi2;            }
  82   Float_t          GetLabelFraction() const       { return fgkLabelFraction;      }
  83   Float_t          GetMinClustersInTrack() const  { return fgkMinClustersInTrack; }
  84   Int_t            GetLastPlane(AliTRDtrack *track);
  85   Double_t         GetTiltFactor(const AliTRDcluster *c);
  86   Bool_t           GetTrackPoint(Int_t index, AliTrackPoint& p) const;
  87   Double_t         GetX(Int_t sec, Int_t plane, Int_t localTB) const;
  88   Double_t         GetX(Int_t sec, Int_t pl) const
  89                                                   { return fTrSec[sec]->GetLayer(pl)->GetX();            }
  90   Int_t            GetGlobalTimeBin(Int_t sec, Int_t plane, Int_t localTB) const
  91                                                   { return fTrSec[sec]->CookTimeBinIndex(plane,localTB); }
  92   Double_t         GetLayerNumber(Int_t sec, Double_t x) const
  93                                                   { return fTrSec[sec]->GetLayerNumber(x);               }
  94   AliCluster      *GetCluster(Int_t index) const  { if (index >= fNclusters) return NULL;
  95                                                     return (AliCluster *) fClusters->UncheckedAt(index); }
  96
  97   static Int_t     Freq(Int_t n, const Int_t *inlist, Int_t *outlist, Bool_t down);
  98   Int_t            Clusters2Tracks(AliESDEvent *event);
  99   Int_t            PropagateBack(AliESDEvent *event);
 100   Int_t            RefitInward(AliESDEvent *event);
 101
 102   virtual void     CookLabel(AliKalmanTrack *t, Float_t wrong) const;
 103
 104   Int_t            LocalToGlobalID(Int_t lid);
 105   Int_t            GlobalToLocalID(Int_t gid);
 106
 107   Int_t            LoadClusters(TTree *cTree);
 108   void             UnloadClusters();
 109   virtual void     UseClusters(const AliKalmanTrack *t, Int_t from = 0) const;
 110   Int_t            ReadClusters(TObjArray *array, TTree *in) const;
 111   AliTRDcluster   *GetCluster(AliTRDtrack *track, Int_t plane, Int_t timebin, UInt_t &index);
 112   Int_t            FindClusters(Int_t sector, Int_t t0, Int_t t1, AliTRDtrack *track
 113                               , Int_t *clusters, AliTRDtracklet &tracklet);
 114
 115  protected:
 116
 117   //__________________________________________________________________________________________________
 118   class AliTRDpropagationLayer {
 119
 120    public:
 121
 122     AliTRDpropagationLayer(Double_t x, Double_t dx, Double_t rho
 123                          , Double_t x0, Int_t tbIndex, Int_t plane);
 124     AliTRDpropagationLayer(const AliTRDpropagationLayer &/*p*/);
 125     ~AliTRDpropagationLayer() {  if (fTimeBinIndex >= 0) {
 126                                    delete[] fClusters;
 127                                    delete[] fIndex;
 128                                  }
 129                                }
 130     AliTRDpropagationLayer &operator=(const AliTRDpropagationLayer &/*p*/)
 131                                                               { return *this; }
 132
 133     operator Int_t() const                                    { return fN;    }
 134     AliTRDcluster  *operator[](Int_t i)                       { return fClusters[i];          }
 135
 136     void     SetZmax(Int_t cham, Double_t center, Double_t w) { fZc[cham]      = center;
 137                                                                 fZmax[cham]    = w;           }
 138     void     SetYmax(Double_t w, Double_t wsensitive)         { fYmax          = w;
 139                                                                 fYmaxSensitive = wsensitive;  }
 140
 141     void     SetZ(Double_t* center, Double_t *w, Double_t *wsensitive);
 142     void     SetHoles(Bool_t* holes);
 143     void     SetHole(Double_t Zmax, Double_t Ymax
 144                    , Double_t rho = 1.29e-3, Double_t x0 = 36.66
 145                    , Double_t Yc = 0.0, Double_t Zc = 0.0);
 146
 147     Double_t GetYmax() const           { return fYmax;                  }
 148     Double_t GetZmax(Int_t c) const    { return fZmax[c];               }
 149     Double_t GetZc(Int_t c) const      { return fZc[c];                 }
 150     UInt_t   GetIndex(Int_t i) const   { return fIndex[i];              }
 151     Double_t GetX() const              { return fX;                     }
 152     Double_t GetdX() const             { return fdX;                    }
 153     Int_t    GetTimeBinIndex() const   { return fTimeBinIndex;          }
 154     Int_t    GetPlane() const          { return fPlane;                 }
 155     Bool_t   IsHole(Int_t zone) const  { return fIsHole[zone];          }
 156     Bool_t   IsSensitive() const       { return (fTimeBinIndex >= 0) ? kTRUE : kFALSE;}
 157
 158     void     Clear() {
 159       for (Int_t i = 0; i < fN; i++) fClusters[i] = NULL;
 160       fN = 0;
 161     }
 162
 163     void     InsertCluster(AliTRDcluster *c, UInt_t index);
 164     Int_t    Find(Float_t y) const;
 165     Int_t    FindNearestCluster(Float_t y, Float_t z, Float_t maxroad, Float_t maxroadz) const;
 166
 167     void     SetX(Double_t x)          { fX = x; }
 168
 169    private:
 170
 171     Int_t                     fN;                            // This is fN
 172     Int_t                     fSec;                          // Sector mumber
 173     AliTRDcluster           **fClusters;                     // Array of pointers to clusters
 174     UInt_t                   *fIndex;                        // Array of cluster indexes
 175     Double_t                  fX;                            // X coordinate of the middle plane
 176     Double_t                  fdX;                           // Radial thickness of the time bin
 177     Double_t                  fRho;                          // Default density of the material
 178     Double_t                  fX0;                           // Default radiation length
 179     Int_t                     fTimeBinIndex;                 // Plane * F(local_tb)
 180     Int_t                     fPlane;                        // Plane number
 181     Double_t                  fZc[kZones];                   // Z position of the center for 5 active areas
 182     Double_t                  fZmax[kZones];                 // Half of active area length in Z
 183     Double_t                  fZmaxSensitive[kZones];        // Sensitive area for detection Z
 184     Bool_t                    fIsHole[kZones];               // Is hole in given sector
 185     Double_t                  fYmax;                         // Half of active area length in Y
 186     Double_t                  fYmaxSensitive;                // Half of active area length in Y
 187
 188     Bool_t                    fHole;                         // kTRUE if there is a hole in the layer
 189     Double_t                  fHoleZc;                       // Z of the center of the hole
 190     Double_t                  fHoleZmax;                     // Half of the hole length in Z
 191     Double_t                  fHoleYc;                       // Y of the center of the hole
 192     Double_t                  fHoleYmax;                     // Half of the hole length in Y
 193     Double_t                  fHoleRho;                      // Density of the gas in the hole
 194     Double_t                  fHoleX0;                       // Radiation length of the gas in the hole
 195
 196   };
 197
 198   //__________________________________________________________________________________________________
 199   class AliTRDtrackingSector {
 200
 201    public:
 202
 203     AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs);
 204     AliTRDtrackingSector(const AliTRDtrackingSector &/*t*/);
 205     ~AliTRDtrackingSector();
 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
 252   Bool_t   AdjustSector(AliTRDtrack *track);
 253
 254  private:
 255
 256   AliTRDtrack *RegisterSeed(AliTRDseed *seeds, Double_t *params);
 257   void     MakeSeedsMI(Int_t inner, Int_t outer, AliESDEvent *esd = 0);
 258
 259   Int_t    FollowBackProlongation(AliTRDtrack &t);
 260   Int_t    FollowProlongation(AliTRDtrack &t);
 261   Int_t    PropagateToX(AliTRDtrack &t, Double_t xToGo, Double_t maxStep);
 262   Double_t ExpectedSigmaY2(Double_t r, Double_t tgl, Double_t pt) const;
 263   Double_t ExpectedSigmaZ2(Double_t r, Double_t tgl) const;
 264
 265   TTreeSRedirector        *fDebugStreamer;                 //!Debug streamer
 266
 267   ClassDef(AliTRDtracker,3)                                // TRD tracker
 268
 269 };
 270 #endif