3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
9 // Author: ruben.shahoyan@cern.ch 20/03/2007
11 ///////////////////////////////////////////////////////////////////////////////////
13 // Wrapper for the set of mag.field parameterizations by Chebyshev polinomials //
14 // To obtain the field in cartesian coordinates/components use //
15 // Field(float* xyz, float* bxyz); //
16 // For cylindrical coordinates/components: //
17 // FieldCyl(float* rphiz, float* brphiz) //
19 // For the moment only the solenoid part is parameterized in the volume defined //
20 // by R<500, -550<Z<550 cm //
22 // The region R<423 cm, -343.3<Z<481.3 for 30kA and -343.3<Z<481.3 for 12kA //
23 // is parameterized using measured data while outside the Tosca calculation //
24 // is used (matched to data on the boundary of the measurements) //
26 // If the querried point is outside the validity region no the return values //
27 // for the field components are set to 0. //
29 ///////////////////////////////////////////////////////////////////////////////////
34 #include "AliCheb3D.h"
35 #include "AliCheb3DCalc.h"
37 class AliMagFCheb: public TNamed
41 AliMagFCheb(const char* inputFile);
42 AliMagFCheb(const AliMagFCheb &src);
43 AliMagFCheb& operator= (const AliMagFCheb &rhs);
47 void AddParamSol(AliCheb3D* param);
48 void AddParamDip(AliCheb3D* param);
51 Int_t GetNParamsSol() const {return fNParamsSol;}
52 Int_t GetNSegZSol() const {return fNSegZSol;}
53 Int_t GetNSegRSol(int iz) const {return iz<fNParamsSol ? fNSegRSol[iz]:0;}
54 Int_t GetSegIDSol(int iz,int ir) const {return iz<fNParamsSol&&ir<fNSegRSol[iz] ? fSegZIdSol[iz]+ir:-1;}
56 Float_t GetMinZSol() const {return fMinZSol;}
57 Float_t GetMaxZSol() const {return fMaxZSol;}
58 Float_t GetMaxRSol() const {return fMaxRSol;}
59 AliCheb3D* GetParamSol(Int_t ipar) const {return (AliCheb3D*)fParamsSol->UncheckedAt(ipar);}
60 AliCheb3D* GetParamDip(Int_t ipar) const {return (AliCheb3D*)fParamsDip->UncheckedAt(ipar);}
62 void LoadData(const char* inpfile);
64 virtual void Print(Option_t * = "") const;
66 virtual void Field(Float_t *xyz, Float_t *b) const;
67 virtual void FieldCyl(Float_t *rphiz, Float_t *b) const;
70 #ifdef _INC_CREATION_ALICHEB3D_ // see AliCheb3D.h for explanation
71 void SaveData(const char* outfile) const;
76 virtual void FieldCylSol(Float_t *rphiz, Float_t *b) const;
80 Int_t fNParamsSol; // Total number of parameterization pieces for Sol
81 Int_t fNSegZSol; // Number of segments is Z
83 Int_t fNParamsDip; // Total number of parameterization pieces for dipole
85 Float_t* fSegZSol; //[fNSegZSol] upper boundaries of Z segments
86 Float_t* fSegRSol; //[fNParamsSol] upper boundaries of R segments
88 Int_t* fNSegRSol; //[fNSegZSol] number of R segments for each Z segment
89 Int_t* fSegZIdSol; //[fNSegZSol] Id of the first R segment of each Z segment in the fSegRSol...
91 Float_t fMinZSol; // Min Z of Sol parameterization (in CYL. coordinates)
92 Float_t fMaxZSol; // Max Z of Sol parameterization (in CYL. coordinates)
93 Float_t fMaxRSol; // Max R of Sol parameterization (in CYL. coordinates)
95 TObjArray* fParamsSol; // Parameterization pieces for Solenoid field
96 TObjArray* fParamsDip; // Parameterization pieces for Dipole field
98 ClassDef(AliMagFCheb,1) // Wrapper class for the set of Chebishev parameterizations of Alice mag.field
103 //__________________________________________________________________________________________
104 inline void AliMagFCheb::FieldCyl(Float_t *rphiz, Float_t *b) const
106 // compute field in Cylindircal coordinates
107 if (rphiz[2]<GetMinZSol() || rphiz[2]>GetMaxZSol() || rphiz[0]>GetMaxRSol()) {for (int i=3;i--;) b[i]=0; return;}
108 FieldCylSol(rphiz,b);