Two-layer perceptron for fast plasma density evaluation in broadband reflectometry

Author

Nunes, F.D. ; Santos, J. ; Manso, M.E.

Author_Institution

Inst. de Telecomun., Inst. Superior Tecnico, Lisbon, Portugal

Volume

2

fYear

1998

fDate

1998

Firstpage

253

Abstract

Broadband reflectometry is a suitable diagnostic to measure plasma density profiles in nuclear fusion devices (e.g. tokamaks). To determine each value of the profile an Abel inversion integral has to be numerically solved. Unfortunately this is a computationally demanding operation that prevents the use of the diagnostic in real-time applications. In this paper we present a new approach to the evaluation of density profiles based on a two-layer perceptron that is faster than the Abel numerical integration. In addition, it has sufficient accuracy for most applications utilized in the tokamak´s real-time control

Keywords

Legendre polynomials; backpropagation; least squares approximations; multilayer perceptrons; physics computing; plasma density; plasma diagnostics; swept-frequency reflectometry; Abel inversion integral; Legendre polynomials; backpropagation; broadband reflectometry; fast plasma density evaluation; least squares approximation; nonlinear mapping; nuclear fusion devices; orthogonal functions; plasma diagnostic; supervised learning; tokamak real-time control; truncated series; two-layer perceptron; Delay; Density measurement; Frequency; Multilayer perceptrons; Plasma density; Plasma devices; Plasma measurements; Plasma waves; Reflectometry; Tokamaks;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 1998 IEEE International Conference on

Conference_Location

Lisboa

Print_ISBN

0-7803-5008-1

Type

conf

DOI

10.1109/ICECS.1998.814874

Filename

814874