1 #ifndef ALI_TPCGG_VOLT_ERROR_H
2 #define ALI_TPCGG_VOLT_ERROR_H
4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 ////////////////////////////////////////////////////////////////////////////
9 // AliTPCGGVoltError class //
10 // The class calculates the electric field and space point distortions //
11 // due a Gating Grid (GG) Error voltage. It uses the exact calculation //
12 // technique based on bessel functions. (original code from STAR) //
13 // The class allows "effective Omega Tau" corrections. //
15 // date: 27/04/2010 //
16 // Authors: Jim Thomas, Stefan Rossegger, Magnus Mager //
17 ////////////////////////////////////////////////////////////////////////////
19 #include "AliTPCCorrection.h"
21 class AliTPCGGVoltError : public AliTPCCorrection {
24 virtual ~AliTPCGGVoltError();
26 // initialization and update functions
28 virtual void Update(const TTimeStamp &timeStamp);
30 // common setters and getters for ExB
31 virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2) {
33 const Double_t wt0=t2*omegaTau; fC0=1./(1.+wt0*wt0);
34 const Double_t wt1=t1*omegaTau; fC1=wt1/(1.+wt1*wt1);
37 void SetC0C1(Double_t c0,Double_t c1) {fC0=c0;fC1=c1;} // CAUTION: USE WITH CARE
38 Float_t GetC0() const {return fC0;}
39 Float_t GetC1() const {return fC1;}
41 // setters and getters for GG
42 void SetDeltaVGGA(Double_t deltaVGGA) {fDeltaVGGA=deltaVGGA;}
43 void SetDeltaVGGC(Double_t deltaVGGC) {fDeltaVGGC=deltaVGGC;}
44 Double_t GetDeltaVGGA() const {return fDeltaVGGA;}
45 Double_t GetDeltaVGGC() const {return fDeltaVGGC;}
47 void InitGGVoltErrorDistortion();
49 Float_t GetIntErOverEz(const Float_t x[],const Short_t roc);
51 virtual void Print(const Option_t* option="") const;
54 virtual void GetCorrection(const Float_t x[],const Short_t roc, Float_t dx[]);
57 Float_t fC0; // coefficient C0 (compare Jim Thomas's notes for definitions)
58 Float_t fC1; // coefficient C1 (compare Jim Thomas's notes for definitions)
60 Double_t fDeltaVGGA; // Missmatch of gating grid voltage on A-side [V]
61 Double_t fDeltaVGGC; // Missmatch of gating grid voltage on C-side [V]
62 Double_t fGGVoltErrorER[kNZ][kNR]; // Array to store electric field for GGVoltError calculation
64 Bool_t fInitLookUp; // flag to check it the Look Up table was created
66 ClassDef(AliTPCGGVoltError,1);