A combined technique for the global optimization of the inverse electromagnetic problem solution

Author

Borghi, C.A. ; Fabbri, M.

Author_Institution

Dept. of Electr. Eng., Bologna Univ., Italy

Volume

33

Issue

2

fYear

1997

fDate

3/1/1997 12:00:00 AM

Firstpage

1947

Lastpage

1950

Abstract

A method for finding the global optimum of the electromagnetic inverse problem solution is presented. The problem consists in the determination of the current system which produces a given magnetic field within a domain of finite extent. An infinite class of solutions exists. In order to find the solution of the synthesis problem obtained, a global optimization technique, based on the combination of the filled function (FF) method and the evolution strategy (ES) method, is developed. The FF method is utilized to find a sequence of regions containing decreasing minima. The minimization inside this region is done by means of the ES method. The technique described has been utilized for the poloidal magnetic system of a toroidal device for thermonuclear fusion experiments and for the main coil system of a nuclear magnetic resonance (NMR) device

Keywords

coils; electromagnetism; fusion reactors; inverse problems; magnetic fields; nuclear magnetic resonance; optimisation; plasma toroidal confinement; current system; evolution strategy method; filled function method; finite extent domain; global optimization; inverse electromagnetic problem solution; magnetic field; main coil system; minimization; nuclear magnetic resonance device; poloidal magnetic system; synthesis problem solution; thermonuclear fusion experiments; toroidal device; Cost function; Current density; Evolution (biology); Inverse problems; Magnetic devices; Magnetic resonance; Minimization methods; Nuclear magnetic resonance; Optimization methods; Toroidal magnetic fields;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.582674

Filename

582674