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0116859c | 1 | #ifndef ALI_TPC_EXB_TWIST_H |
2 | #define ALI_TPC_EXB_TWIST_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 | // AliTPCExBTwist class // | |
10 | // The class calculates the space point distortions due to a mismatch // | |
11 | // of the E and B field axis (original code from STAR) // | |
12 | // The class allows "effective Omega Tau" corrections. // | |
13 | // // | |
14 | // date: 27/04/2010 // | |
15 | // Authors: Jim Thomas, Magnus Mager, Stefan Rossegger // | |
16 | //////////////////////////////////////////////////////////////////////////// | |
17 | ||
18 | #include "AliTPCCorrection.h" | |
19 | ||
20 | class AliTPCExBTwist : public AliTPCCorrection { | |
21 | public: | |
22 | AliTPCExBTwist(); | |
23 | virtual ~AliTPCExBTwist(); | |
24 | ||
e527a1b9 | 25 | // initialization and update functions |
26 | virtual void Init(); | |
27 | virtual void Update(const TTimeStamp &timeStamp); | |
28 | ||
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; |
0116859c | 33 | const Float_t wt1=t1*omegaTau; |
34 | fC1=wt1/(1.+wt1*wt1); | |
35 | const Float_t wt2=t2*omegaTau; | |
36 | fC2=wt2*wt2/(1.+wt2*wt2); | |
37 | }; | |
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;} | |
41 | ||
42 | // setters and getters for twist | |
43 | void SetXTwist(Float_t xTwist) {fXTwist=xTwist;} | |
44 | void SetYTwist(Float_t yTwist) {fYTwist=yTwist;} | |
45 | Float_t GetXTwist() const {return fXTwist;} | |
46 | Float_t GetYTwist() const {return fYTwist;} | |
47 | ||
48 | virtual void Print(Option_t* option="") const; | |
49 | ||
50 | protected: | |
51 | virtual void GetCorrection(const Float_t x[],const Short_t roc,Float_t dx[]); | |
52 | ||
53 | private: | |
54 | Float_t fC1; // coefficient C1 (compare Jim Thomas's notes for definitions) | |
55 | Float_t fC2; // coefficient C2 (compare Jim Thomas's notes for definitions) | |
56 | ||
57 | Float_t fXTwist; // Twist of E to B field in X-Z [rad] | |
58 | Float_t fYTwist; // Twist of E to B field in Y-Z [rad] | |
59 | ||
60 | ClassDef(AliTPCExBTwist,1); | |
61 | }; | |
62 | ||
63 | #endif |