#ifndef ALI_TPC_CORRECTION_H #define ALI_TPC_CORRECTION_H /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * * See cxx source for full Copyright notice */ //////////////////////////////////////////////////////////////////////////////// // // // AliTPCCorrection class // // // // This class provides a general framework to deal with space point // // distortions. An correction class which inherits from here is for example // // AliTPCExBBShape or AliTPCExBTwist // // // // General functions are (for example): // // CorrectPoint(x,roc) where x is the vector of inital positions in // // cartesian coordinates and roc represents the Read Out chamber number // // according to the offline naming convention. The vector x is overwritten // // with the corrected coordinates. // // // // An alternative usage would be CorrectPoint(x,roc,dx), which leaves the // // vector x untouched, put returns the distortions via the vector dx // // // // The class allows "effective Omega Tau" corrections to be shifted to the // // single distortion classes. // // // // Note: This class is normally used via the class AliTPCComposedCorrection // // // // date: 27/04/2010 // // Authors: Magnus Mager, Stefan Rossegger, Jim Thomas // //////////////////////////////////////////////////////////////////////////////// #include #include "TMatrixD.h" class TH2F; class TTimeStamp; class TCollection; class TTreeSRedirector; class AliExternalTrackParam; class TTree; class THnSparse; class AliESDVertex; class AliTPCCorrection : public TNamed { public: enum CompositionType {kParallel,kQueue}; AliTPCCorrection(); AliTPCCorrection(const char *name,const char *title); virtual ~AliTPCCorrection(); // functions to correct a space point void CorrectPoint ( Float_t x[],const Short_t roc); void CorrectPoint (const Float_t x[],const Short_t roc,Float_t xp[]); virtual void GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]); // functions to distort a space point void DistortPoint ( Float_t x[],const Short_t roc); void DistortPoint (const Float_t x[],const Short_t roc,Float_t xp[]); virtual void GetDistortion(const Float_t x[],const Short_t roc,Float_t dx[]); // initialization and update functions virtual void Init(); virtual void Update(const TTimeStamp &timeStamp); // convenience functions virtual void Print(Option_t* option="") const; TH2F* CreateHistoDRinXY (Float_t z=10.,Int_t nx=100,Int_t ny=100); TH2F* CreateHistoDRPhiinXY(Float_t z=10.,Int_t nx=100,Int_t nphi=100); TH2F* CreateHistoDRinZR (Float_t phi=0.,Int_t nZ=100,Int_t nR=100); TH2F* CreateHistoDRPhiinZR(Float_t phi=0.,Int_t nZ=100,Int_t nR=100); TTree* CreateDistortionTree(Double_t step=5); static void MakeDistortionMap(THnSparse * his0, TTreeSRedirector *pcstream, const char* hname, Int_t run); // normally called directly in the correction classes which inherit from this class virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2); AliExternalTrackParam * FitDistortedTrack(AliExternalTrackParam & trackIn, Double_t refX, Int_t dir,TTreeSRedirector *pcstream); void StoreInOCDB(Int_t startRun, Int_t endRun, const char *comment=0); static void MakeTrackDistortionTree(TTree *tinput, Int_t dtype, Int_t ptype, const TObjArray * corrArray, Int_t step=1, Bool_t debug=0); static void MakeLaserDistortionTree(TTree* tree, TObjArray *corrArray, Int_t itype); void FastSimDistortedVertex(Double_t orgVertex[3], Int_t nTracks, AliESDVertex &aV, AliESDVertex &avOrg, AliESDVertex &cV, AliESDVertex &cvOrg, TTreeSRedirector * const pcstream, Double_t etaCuts); static void AddVisualCorrection(AliTPCCorrection* corr, Int_t position); static Double_t GetCorrSector(Double_t sector, Double_t localX, Double_t kZ, Int_t axisType, Int_t corrType=0); static Double_t GetCorrXYZ(Double_t gx, Double_t gy, Double_t gz, Int_t axisType, Int_t corrType=0); protected: TH2F* CreateTH2F(const char *name,const char *title, const char *xlabel,const char *ylabel,const char *zlabel, Int_t nbinsx,Double_t xlow,Double_t xup, Int_t nbinsy,Double_t ylow,Double_t yup); static const Double_t fgkTPCZ0; // nominal gating grid position static const Double_t fgkIFCRadius; // Mean Radius of the Inner Field Cage ( 82.43 min, 83.70 max) (cm) static const Double_t fgkOFCRadius; // Mean Radius of the Outer Field Cage (252.55 min, 256.45 max) (cm) static const Double_t fgkZOffSet; // Offset from CE: calculate all distortions closer to CE as if at this point static const Double_t fgkCathodeV; // Cathode Voltage (volts) static const Double_t fgkGG; // Gating Grid voltage (volts) enum {kNR= 92}; // Number of R points in the table for interpolating distortion data enum {kNZ= 270}; // Number of Z points in the table for interpolating distortion data static const Double_t fgkRList[kNR]; // points in the radial direction (for the lookup table) static const Double_t fgkZList[kNZ]; // points in the z direction (for the lookup table) // Simple Interpolation functions: e.g. with tricubic interpolation (not yet in TH3) Int_t fJLow; // variable to help in the interpolation Int_t fKLow; // variable to help in the interpolation void Interpolate2DEdistortion( const Int_t order, const Double_t r, const Double_t z, const Double_t er[kNZ][kNR], Double_t &erValue ); Double_t Interpolate( const Double_t xArray[], const Double_t yArray[], const Int_t order, const Double_t x ); void Search( const Int_t n, const Double_t xArray[], const Double_t x, Int_t &low ); virtual Int_t IsPowerOfTwo ( Int_t i ) const ; // Algorithms to solve the laplace or possion equation void PoissonRelaxation2D(TMatrixD &arrayV, const TMatrixD &chargeDensity, TMatrixD &arrayErOverEz, const Int_t rows, const Int_t columns, const Int_t iterations ); protected: Double_t fT1; // tensor term of wt - T1 Double_t fT2; // tensor term of wt - T2 static TObjArray *fgVisualCorrection; // array of orrection for visualization private: ClassDef(AliTPCCorrection,2); }; #endif