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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 | //////////////////////////////////////////////////////////////////////////// | |
8 | // // | |
9 | // AliTPCSpaceCharge class // | |
10 | // date: 19/06/2010 // | |
11 | // Authors: Jim Thomas, Stefan Rossegger // | |
12 | //////////////////////////////////////////////////////////////////////////// | |
13 | ||
14 | #include "AliTPCCorrection.h" | |
15 | ||
16 | ||
17 | class AliTPCSpaceCharge : public AliTPCCorrection { | |
18 | public: | |
19 | AliTPCSpaceCharge(); | |
20 | virtual ~AliTPCSpaceCharge(); | |
21 | ||
22 | // initialization and update functions | |
23 | virtual void Init(); | |
24 | virtual void Update(const TTimeStamp &timeStamp); | |
25 | ||
26 | ||
27 | // common setters and getters for tangled ExB effect | |
28 | virtual void SetOmegaTauT1T2(Float_t omegaTau,Float_t t1,Float_t t2) { | |
29 | fT1=t1; fT2=t2; | |
30 | const Double_t wt0=t2*omegaTau; fC0=1./(1.+wt0*wt0); | |
31 | const Double_t wt1=t1*omegaTau; fC1=wt1/(1.+wt1*wt1); | |
32 | }; | |
33 | void SetC0C1(Float_t c0,Float_t c1) {fC0=c0;fC1=c1;} // CAUTION: USE WITH CARE | |
34 | Float_t GetC0() const {return fC0;} | |
35 | Float_t GetC1() const {return fC1;} | |
36 | ||
37 | // setters and getters for conical | |
38 | void SetCorrectionFactor(Float_t correctionFactor) {fCorrectionFactor=correctionFactor;} | |
39 | Float_t GetCorrectionFactor() const {return fCorrectionFactor;} | |
40 | ||
41 | void InitSpaceChargeDistortion(); | |
42 | ||
43 | virtual void Print(const Option_t* option="") const; | |
44 | ||
45 | protected: | |
46 | virtual void GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]); | |
47 | ||
48 | private: | |
49 | Float_t fC0; // coefficient C0 (compare Jim Thomas's notes for definitions) | |
50 | Float_t fC1; // coefficient C1 (compare Jim Thomas's notes for definitions) | |
51 | Float_t fCorrectionFactor; // Space Charge Correction factor in comparison to initialized | |
52 | // look up table which was created for M_mb = 900 and IR = 3000 | |
53 | // compare Internal Note Nr: ??? | |
54 | ||
55 | Bool_t fInitLookUp; // flag to check it the Look Up table was created | |
56 | ||
57 | Double_t fLookUpErOverEz[kNZ][kNR]; // Array to store electric field integral (int Er/Ez) | |
58 | Double_t fLookUpDeltaEz[kNZ][kNR]; // Array to store electric field integral (int Delta Ez) | |
59 | ||
60 | // basic numbers for the poisson relaxation //can be set individually in each class | |
61 | enum {kRows =257}; // grid size in r direction used in the poisson relaxation // ( 2**n + 1 ) eg. 65, 129, 257 etc. | |
62 | enum {kColumns=129}; // grid size in z direction used in the poisson relaxation // ( 2**m + 1 ) eg. 65, 129, 257 etc. | |
63 | enum {kIterations=100}; // Number of iterations within the poisson relaxation | |
64 | ||
65 | ClassDef(AliTPCSpaceCharge,0); | |
66 | }; | |
67 | ||
68 | #endif |