Parameterisation of the measured mag. field map. (R. Shahoyan)
[u/mrichter/AliRoot.git] / STEER / AliMagFCheb.h
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0eea9d4d 1#ifndef ALIMAGFCHEB_H
2#define ALIMAGFCHEB_H
3/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
5
6/* $Id$ */
7
8
9// Author: ruben.shahoyan@cern.ch 20/03/2007
10//
11///////////////////////////////////////////////////////////////////////////////////
12// //
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) //
18// //
19// For the moment only the solenoid part is parameterized in the volume defined //
20// by R<500, -550<Z<550 cm //
21// //
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) //
25// //
26// If the querried point is outside the validity region no the return values //
27// for the field components are set to 0. //
28// //
29///////////////////////////////////////////////////////////////////////////////////
30
31
32#include <TSystem.h>
33#include <TNamed.h>
34#include "AliCheb3D.h"
35
36class AliMagFCheb: public TNamed
37{
38 public:
39 AliMagFCheb() {Init0();}
40 AliMagFCheb(const char* inputFile);
41 ~AliMagFCheb();
42 //
43 void AddParamSol(AliCheb3D* param);
44 void AddParamDip(AliCheb3D* param);
45 void BuildTableSol();
46 //
47 Int_t GetNParamsSol() const {return fNParamsSol;}
48 Int_t GetNSegZSol() const {return fNSegZSol;}
49 Int_t GetNSegRSol(int iz) const {return iz<fNParamsSol ? fNSegRSol[iz]:0;}
50 Int_t GetSegIDSol(int iz,int ir) const {return iz<fNParamsSol&&ir<fNSegRSol[iz] ? fSegZIdSol[iz]+ir:-1;}
51 //
52 Float_t GetMinZSol() const {return fMinZSol;}
53 Float_t GetMaxZSol() const {return fMaxZSol;}
54 Float_t GetMaxRSol() const {return fMaxRSol;}
55 AliCheb3D* GetParamSol(Int_t ipar) const {return (AliCheb3D*)fParamsSol->UncheckedAt(ipar);}
56 AliCheb3D* GetParamDip(Int_t ipar) const {return (AliCheb3D*)fParamsDip->UncheckedAt(ipar);}
57 //
58 void LoadData(const char* inpfile);
59 //
60 virtual void Print(Option_t * = "") const;
61 //
62 virtual void Field(Float_t *xyz, Float_t *b) const;
63 virtual void FieldCyl(Float_t *rphiz, Float_t *b) const;
64 //
65 //
66#ifdef _INC_CREATION_ALICHEB3D_ // see AliCheb3D.h for explanation
67 void SaveData(const char* outfile) const;
68#endif
69 //
70 protected:
71 void Init0();
72 virtual void FieldCylSol(Float_t *rphiz, Float_t *b) const;
73 //
74 protected:
75 //
76 Int_t fNParamsSol; // Total number of parameterization pieces for Sol
77 Int_t fNSegZSol; // Number of segments is Z
78 //
79 Int_t fNParamsDip; // Total number of parameterization pieces for dipole
80 //
81 Float_t* fSegZSol; //[fNSegZSol] upper boundaries of Z segments
82 Float_t* fSegRSol; //[fNParamsSol] upper boundaries of R segments
83 //
84 Int_t* fNSegRSol; //[fNSegZSol] number of R segments for each Z segment
85 Int_t* fSegZIdSol; //[fNSegZSol] Id of the first R segment of each Z segment in the fSegRSol...
86 //
87 Float_t fMinZSol; // Min Z of Sol parameterization (in CYL. coordinates)
88 Float_t fMaxZSol; // Max Z of Sol parameterization (in CYL. coordinates)
89 Float_t fMaxRSol; // Max R of Sol parameterization (in CYL. coordinates)
90 //
91 TObjArray* fParamsSol; // Parameterization pieces for Solenoid field
92 TObjArray* fParamsDip; // Parameterization pieces for Dipole field
93 //
94 ClassDef(AliMagFCheb,1) // Wrapper class for the set of Chebishev parameterizations of Alice mag.field
95 //
96 };
97
98
99//__________________________________________________________________________________________
100inline void AliMagFCheb::FieldCyl(Float_t *rphiz, Float_t *b) const
101{
102 // compute field in Cylindircal coordinates
103 if (rphiz[2]<GetMinZSol() || rphiz[2]>GetMaxZSol() || rphiz[0]>GetMaxRSol()) {for (int i=3;i--;) b[i]=0; return;}
104 FieldCylSol(rphiz,b);
105}
106
107#endif