Simulation of Open-loop Plasma Vertical Movement Response in the Damavand Tokamak Using Closed-loop Subspace System Identification

TL;DR

This paper presents a closed-loop subspace system identification method to accurately model the vacuum-plasma response in the Damavand tokamak, facilitating robust control design with high fidelity.

Contribution

It introduces a worst-case identification technique for plasma response modeling in tokamaks, achieving over 90% model fitness and outperforming physical-based models.

Findings

Model fitness exceeds 90% around the operating point

The method outperforms physical-based models in goodness of fit

Provides a control-relevant model suitable for robust controller design

Abstract

A formulation of a multi-input single-output closed-loop subspace method for system identification is employed for the purpose of obtaining control-relevant model of the vacuum-plasma response in the Damavand tokamak. Such a model is particularly well suited for robust controller design. The accuracy of the estimate of the plant dynamics is estimated by different experiments. The method has been described in this paper is a worst-case identification technique, that aims to minimize the error between the identified model and the true plant. The fitness of the identified model around defined operating point is more than 90% and compared with physical-based model it has better root mean square measure of the goodness of fit.