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c9cbd2f2 | 1 | #ifndef ALITPCSPACECHARGE_H |
2 | #define ALITPCSPACECHARGE_H | |
3 | ||
4 | /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
5 | * See cxx source for full Copyright notice */ | |
6 | ||
7 | //////////////////////////////////////////////////////////////////////////// | |
c9cbd2f2 | 8 | // AliTPCSpaceCharge class // |
c9cbd2f2 | 9 | // Authors: Jim Thomas, Stefan Rossegger // |
10 | //////////////////////////////////////////////////////////////////////////// | |
11 | ||
12 | #include "AliTPCCorrection.h" | |
13 | ||
14 | ||
15 | class AliTPCSpaceCharge : public AliTPCCorrection { | |
16 | public: | |
17 | AliTPCSpaceCharge(); | |
18 | virtual ~AliTPCSpaceCharge(); | |
19 | ||
20 | // initialization and update functions | |
21 | virtual void Init(); | |
22 | virtual void Update(const TTimeStamp &timeStamp); | |
23 | ||
24 | ||
25 | // common setters and getters for tangled ExB effect | |
26 | virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2) { | |
27 | fT1=t1; fT2=t2; | |
28 | const Double_t wt0=t2*omegaTau; fC0=1./(1.+wt0*wt0); | |
29 | const Double_t wt1=t1*omegaTau; fC1=wt1/(1.+wt1*wt1); | |
30 | }; | |
31 | void SetC0C1(Float_t c0,Float_t c1) {fC0=c0;fC1=c1;} // CAUTION: USE WITH CARE | |
32 | Float_t GetC0() const {return fC0;} | |
33 | Float_t GetC1() const {return fC1;} | |
34 | ||
35 | // setters and getters for conical | |
36 | void SetCorrectionFactor(Float_t correctionFactor) {fCorrectionFactor=correctionFactor;} | |
37 | Float_t GetCorrectionFactor() const {return fCorrectionFactor;} | |
38 | ||
39 | void InitSpaceChargeDistortion(); | |
40 | ||
41 | virtual void Print(const Option_t* option="") const; | |
42 | ||
43 | protected: | |
44 | virtual void GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]); | |
45 | ||
46 | private: | |
47 | Float_t fC0; // coefficient C0 (compare Jim Thomas's notes for definitions) | |
48 | Float_t fC1; // coefficient C1 (compare Jim Thomas's notes for definitions) | |
49 | Float_t fCorrectionFactor; // Space Charge Correction factor in comparison to initialized | |
50 | // look up table which was created for M_mb = 900 and IR = 3000 | |
51 | // compare Internal Note Nr: ??? | |
52 | ||
53 | Bool_t fInitLookUp; // flag to check it the Look Up table was created | |
54 | ||
55 | Double_t fLookUpErOverEz[kNZ][kNR]; // Array to store electric field integral (int Er/Ez) | |
56 | Double_t fLookUpDeltaEz[kNZ][kNR]; // Array to store electric field integral (int Delta Ez) | |
57 | ||
58 | // basic numbers for the poisson relaxation //can be set individually in each class | |
59 | enum {kRows =257}; // grid size in r direction used in the poisson relaxation // ( 2**n + 1 ) eg. 65, 129, 257 etc. | |
60 | enum {kColumns=129}; // grid size in z direction used in the poisson relaxation // ( 2**m + 1 ) eg. 65, 129, 257 etc. | |
61 | enum {kIterations=100}; // Number of iterations within the poisson relaxation | |
62 | ||
63 | ClassDef(AliTPCSpaceCharge,0); | |
64 | }; | |
65 | ||
66 | #endif |