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 AliESD;
  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
  58   TH1D *fHXCl;
  59
  60   void InitLogHists();
  61   void SaveLogHists();
  62
  63  public:
  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        { 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(AliESD *event);
  98   Int_t    PropagateBack(AliESD *event);
  99   Int_t    RefitInward(AliESD *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   Bool_t   Transform(AliTRDcluster *cluster);
 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   class AliTRDpropagationLayer {
 118
 119   public:
 120
 121     AliTRDpropagationLayer(Double_t x, Double_t dx, Double_t rho
 122                            , Double_t x0, Int_t tbIndex, Int_t plane);
 123     AliTRDpropagationLayer(const AliTRDpropagationLayer &/*p*/);
 124     ~AliTRDpropagationLayer() {
 125       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) {
 137       fZc[cham] = center;
 138       fZmax[cham]    = w;
 139     }
 140     void SetYmax(Double_t w, Double_t wsensitive) {
 141       fYmax          = w;
 142       fYmaxSensitive = wsensitive;
 143     }
 144
 145     void SetZ(Double_t* center, Double_t *w, Double_t *wsensitive);
 146     void SetHoles(Bool_t* holes);
 147     void SetHole(Double_t Zmax, Double_t Ymax
 148                  , Double_t rho = 1.29e-3, Double_t x0 = 36.66
 149                  , Double_t Yc = 0.0, Double_t Zc = 0.0);
 150
 151     Double_t GetYmax() const           { return fYmax;                  }
 152     Double_t GetZmax(Int_t c) const    { return fZmax[c];               }
 153     Double_t GetZc(Int_t c) const      { return fZc[c];                 }
 154     UInt_t   GetIndex(Int_t i) const   { return fIndex[i];              }
 155     Double_t GetX() const              { return fX;                     }
 156     Double_t GetdX() const             { return fdX;                    }
 157     Int_t    GetTimeBinIndex() const   { return fTimeBinIndex;          }
 158     Int_t    GetPlane() const          { return fPlane;                 }
 159     Bool_t   IsHole(Int_t zone) const  { return fIsHole[zone];          }
 160     Bool_t   IsSensitive() const       { return (fTimeBinIndex >= 0)? kTRUE : kFALSE;}
 161
 162     void     Clear() {
 163       for (Int_t i = 0; i < fN; i++) fClusters[i] = NULL;
 164       fN = 0;
 165     }
 166
 167     void     InsertCluster(AliTRDcluster *c, UInt_t index);
 168     Int_t    Find(Float_t y) const;
 169     Int_t    FindNearestCluster(Float_t y, Float_t z, Float_t maxroad, Float_t maxroadz) const;
 170
 171     void SetX(Double_t x) {fX = x;}
 172
 173
 174   private:
 175
 176     Int_t                     fN;                            // This is fN
 177     Int_t                     fSec;                          // Sector mumber
 178     AliTRDcluster           **fClusters;                     // Array of pointers to clusters
 179     UInt_t                   *fIndex;                        // Array of cluster indexes
 180     Double_t                  fX;                            // X coordinate of the middle plane
 181     Double_t                  fdX;                           // Radial thickness of the time bin
 182     Double_t                  fRho;                          // Default density of the material
 183     Double_t                  fX0;                           // Default radiation length
 184     Int_t                     fTimeBinIndex;                 // Plane * F(local_tb)
 185     Int_t                     fPlane;                        // Plane number
 186     Double_t                  fZc[kZones];                   // Z position of the center for 5 active areas
 187     Double_t                  fZmax[kZones];                 // Half of active area length in Z
 188     Double_t                  fZmaxSensitive[kZones];        // Sensitive area for detection Z
 189     Bool_t                    fIsHole[kZones];               // Is hole in given sector
 190     Double_t                  fYmax;                         // Half of active area length in Y
 191     Double_t                  fYmaxSensitive;                // Half of active area length in Y
 192
 193     Bool_t                    fHole;                         // kTRUE if there is a hole in the layer
 194     Double_t                  fHoleZc;                       // Z of the center of the hole
 195     Double_t                  fHoleZmax;                     // Half of the hole length in Z
 196     Double_t                  fHoleYc;                       // Y of the center of the hole
 197     Double_t                  fHoleYmax;                     // Half of the hole length in Y
 198     Double_t                  fHoleRho;                      // Density of the gas in the hole
 199     Double_t                  fHoleX0;                       // Radiation length of the gas in the hole
 200
 201   };
 202
 203   class AliTRDtrackingSector {
 204
 205    public:
 206
 207     AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs);
 208     AliTRDtrackingSector(const AliTRDtrackingSector &/*t*/);
 209     ~AliTRDtrackingSector() {
 210       for (Int_t i = 0; i < fN; i++) delete fLayers[i];
 211     }
 212
 213     AliTRDtrackingSector &operator=(const AliTRDtrackingSector &/*t*/){ return *this;}
 214
 215     Int_t    GetNumberOfLayers() const             { return fN;}
 216     Int_t    GetNumberOfTimeBins() const;
 217     Int_t    GetLayerNumber(Double_t x) const;
 218     Int_t    GetInnerTimeBin() const;
 219     Int_t    GetOuterTimeBin() const;
 220     Int_t    GetLayerNumber(Int_t tb) const        { return fTimeBinIndex[tb];}
 221     Double_t GetX(Int_t pl) const                  { return fLayers[pl]->GetX();}
 222     AliTRDpropagationLayer* GetLayer(Int_t i)      { return fLayers[i];}
 223
 224     void     MapTimeBinLayers();
 225     Int_t    Find(Double_t x) const;
 226     void     InsertLayer(AliTRDpropagationLayer *pl);
 227     Int_t    CookTimeBinIndex(Int_t plane, Int_t localTB) const;
 228
 229   private:
 230
 231     Int_t                   fN;                              // Total number of layers
 232     AliTRDgeometry         *fGeom;                           // Geometry
 233     AliTRDpropagationLayer *fLayers[kMaxLayersPerSector];    // Layers
 234     Int_t                   fTimeBinIndex[kMaxTimeBinIndex]; // Time bin index
 235     Int_t                   fGeomSector;                     // Sector# in AliTRDgeometry
 236
 237   };
 238
 239   AliTRDgeometry          *fGeom;                          // Pointer to TRD geometry
 240   AliTRDtrackingSector    *fTrSec[kTrackingSectors];       // Array of tracking sectors;
 241   Int_t                    fNclusters;                     // Number of clusters in TRD
 242   TObjArray               *fClusters;                      // List of clusters for all sectors
 243   Int_t                    fNseeds;                        // Number of track seeds
 244   TObjArray               *fSeeds;                         // List of track seeds
 245   Int_t                    fNtracks;                       // Number of reconstructed tracks
 246   TObjArray               *fTracks;                        // List of reconstructed tracks
 247   Int_t                    fTimeBinsPerPlane;              // Timebins per plane in track prolongation
 248
 249   static const Double_t    fgkMaxChi2;                     // Max increment in track chi2
 250   static const Float_t     fgkMinClustersInTrack;          // Min number of clusters in track
 251   static const Float_t     fgkLabelFraction;               // Min fraction of same label
 252   static const Double_t    fgkMaxSnp;                      // Maximal snp for tracking
 253   static const Double_t    fgkMaxStep;                     // Maximal step for tracking
 254
 255   Bool_t                   fAddTRDseeds;                   // Something else
 256   Bool_t                   fNoTilt;                        // No tilt, or what?
 257   Bool_t                   fHoles[5][18];                  // Holes
 258
 259   Bool_t   AdjustSector(AliTRDtrack *track);
 260
 261  private:
 262
 263   AliTRDtrack *RegisterSeed(AliTRDseed *seeds, Double_t *params);
 264   void     MakeSeedsMI(Int_t inner, Int_t outer, AliESD *esd = 0);
 265
 266   Int_t    FollowBackProlongation(AliTRDtrack &t);
 267   Int_t    FollowProlongation(AliTRDtrack &t);
 268   void     CookdEdxTimBin(AliTRDtrack &t);
 269   Int_t    PropagateToX(AliTRDtrack &t, Double_t xToGo, Double_t maxStep);
 270   Double_t ExpectedSigmaY2(Double_t r, Double_t tgl, Double_t pt) const;
 271   Double_t ExpectedSigmaZ2(Double_t r, Double_t tgl) const;
 272
 273   TTreeSRedirector        *fDebugStreamer;                 //!Debug streamer
 274
 275   ClassDef(AliTRDtracker,2)                                        // TRD tracker
 276
 277  };
 278 #endif