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"
36 class AliMagFCheb: public TNamed
40 AliMagFCheb(const char* inputFile);
41 AliMagFCheb(const AliMagFCheb &src);
42 AliMagFCheb& operator= (const AliMagFCheb &rhs);
46 void AddParamSol(AliCheb3D* param);
47 void AddParamDip(AliCheb3D* param);
50 Int_t GetNParamsSol() const {return fNParamsSol;}
51 Int_t GetNSegZSol() const {return fNSegZSol;}
52 Int_t GetNSegRSol(int iz) const {return iz<fNParamsSol ? fNSegRSol[iz]:0;}
53 Int_t GetSegIDSol(int iz,int ir) const {return iz<fNParamsSol&&ir<fNSegRSol[iz] ? fSegZIdSol[iz]+ir:-1;}
55 Float_t GetMinZSol() const {return fMinZSol;}
56 Float_t GetMaxZSol() const {return fMaxZSol;}
57 Float_t GetMaxRSol() const {return fMaxRSol;}
58 AliCheb3D* GetParamSol(Int_t ipar) const {return (AliCheb3D*)fParamsSol->UncheckedAt(ipar);}
59 AliCheb3D* GetParamDip(Int_t ipar) const {return (AliCheb3D*)fParamsDip->UncheckedAt(ipar);}
61 void LoadData(const char* inpfile);
63 virtual void Print(Option_t * = "") const;
65 virtual void Field(Float_t *xyz, Float_t *b) const;
66 virtual void FieldCyl(Float_t *rphiz, Float_t *b) const;
69 #ifdef _INC_CREATION_ALICHEB3D_ // see AliCheb3D.h for explanation
70 void SaveData(const char* outfile) const;
75 virtual void FieldCylSol(Float_t *rphiz, Float_t *b) const;
79 Int_t fNParamsSol; // Total number of parameterization pieces for Sol
80 Int_t fNSegZSol; // Number of segments is Z
82 Int_t fNParamsDip; // Total number of parameterization pieces for dipole
84 Float_t* fSegZSol; //[fNSegZSol] upper boundaries of Z segments
85 Float_t* fSegRSol; //[fNParamsSol] upper boundaries of R segments
87 Int_t* fNSegRSol; //[fNSegZSol] number of R segments for each Z segment
88 Int_t* fSegZIdSol; //[fNSegZSol] Id of the first R segment of each Z segment in the fSegRSol...
90 Float_t fMinZSol; // Min Z of Sol parameterization (in CYL. coordinates)
91 Float_t fMaxZSol; // Max Z of Sol parameterization (in CYL. coordinates)
92 Float_t fMaxRSol; // Max R of Sol parameterization (in CYL. coordinates)
94 TObjArray* fParamsSol; // Parameterization pieces for Solenoid field
95 TObjArray* fParamsDip; // Parameterization pieces for Dipole field
97 ClassDef(AliMagFCheb,1) // Wrapper class for the set of Chebishev parameterizations of Alice mag.field
102 //__________________________________________________________________________________________
103 inline void AliMagFCheb::FieldCyl(Float_t *rphiz, Float_t *b) const
105 // compute field in Cylindircal coordinates
106 if (rphiz[2]<GetMinZSol() || rphiz[2]>GetMaxZSol() || rphiz[0]>GetMaxRSol()) {for (int i=3;i--;) b[i]=0; return;}
107 FieldCylSol(rphiz,b);