1 #ifndef ALI_TPC_EX_BB_SHAPE_H
2 #define ALI_TPC_EX_BB_SHAPE_H
4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 ////////////////////////////////////////////////////////////////////////////
9 // AliExBBShape class //
10 // The class calculates the space point distortions due to the B field //
11 // shape imperfections using a second order technique based on integrals //
12 // over Bz (e.g. int By/Bz) obtained via the AliMagF class //
13 // The class allows "effective Omega Tau" corrections. //
15 // date: 27/04/2010 //
16 // Authors: Magnus Mager, Jim Thomas, Stefan Rossegger //
17 ////////////////////////////////////////////////////////////////////////////
19 #include "AliTPCCorrection.h"
23 class AliTPCExBBShape : public AliTPCCorrection {
26 virtual ~AliTPCExBBShape();
28 // initialization and update functions
30 virtual void Update(const TTimeStamp &timeStamp);
32 // common setters and getters for ExB
33 virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2) {
35 const Float_t wt1=t1*omegaTau; fC1=wt1/(1.+wt1*wt1);
36 const Float_t wt2=t2*omegaTau; fC2=wt2*wt2/(1.+wt2*wt2);
38 void SetC1C2(Float_t c1,Float_t c2) {fC1=c1;fC2=c2;} // CAUTION: USE WITH CARE
39 Float_t GetC1() const {return fC1;}
40 Float_t GetC2() const {return fC2;}
42 // setters and getters for the magentic field map
43 void SetBField(const AliMagF *bField) {fBField=(AliMagF*)bField;}
44 AliMagF* GetBField() const {return fBField;}
46 virtual void GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]);
47 void GetBxAndByOverBz(const Float_t x[],const Short_t roc,Float_t BxByOverBz[]);
49 virtual void Print(Option_t* option="") const;
52 Float_t fC1; // coefficient C1 (compare Jim Thomas's notes for definitions)
53 Float_t fC2; // coefficient C2 (compare Jim Thomas's notes for definitions)
55 AliMagF *fBField; // pointer to magnetic field
57 AliTPCExBBShape & operator =(const AliTPCExBBShape);
58 AliTPCExBBShape(const AliTPCExBBShape&); //dummy copy contructor
60 ClassDef(AliTPCExBBShape,2);