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[u/mrichter/AliRoot.git] / TPC / AliTPCGGVoltError.h
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b1f0a2a5 1#ifndef ALI_TPCGG_VOLT_ERROR_H
2#define ALI_TPCGG_VOLT_ERROR_H
0116859c 3
4/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
6
7////////////////////////////////////////////////////////////////////////////
8// //
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. //
14// //
15// date: 27/04/2010 //
16// Authors: Jim Thomas, Stefan Rossegger, Magnus Mager //
17////////////////////////////////////////////////////////////////////////////
18
19#include "AliTPCCorrection.h"
20
21class AliTPCGGVoltError : public AliTPCCorrection {
22public:
23 AliTPCGGVoltError();
24 virtual ~AliTPCGGVoltError();
25
e527a1b9 26 // initialization and update functions
27 virtual void Init();
28 virtual void Update(const TTimeStamp &timeStamp);
29
0116859c 30 // common setters and getters for ExB
31 virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2) {
534fd34a 32 fT1=t1; fT2=t2;
b1f0a2a5 33 const Double_t wt0=t2*omegaTau; fC0=1./(1.+wt0*wt0);
34 const Double_t wt1=t1*omegaTau; fC1=wt1/(1.+wt1*wt1);
0116859c 35 };
36
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;}
40
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;}
46
47 void InitGGVoltErrorDistortion();
48
49 Float_t GetIntErOverEz(const Float_t x[],const Short_t roc);
50
b1f0a2a5 51 virtual void Print(const Option_t* option="") const;
0116859c 52
53protected:
54 virtual void GetCorrection(const Float_t x[],const Short_t roc, Float_t dx[]);
55private:
56
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)
59
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
63
1b923461 64 Bool_t fInitLookUp; // flag to check it the Look Up table was created
65
0116859c 66 ClassDef(AliTPCGGVoltError,1);
67};
68
69#endif