Heat flux reconstruction and effective diffusion estimation from perturbative experiments using advanced filtering and confidence analysis

TitleHeat flux reconstruction and effective diffusion estimation from perturbative experiments using advanced filtering and confidence analysis
Publication TypeJournal Article
Year of Publication2018
AuthorsM. van Berkel, T. Kobayashi, G. Vandersteen, H.J Zwart, H. Igami, S. Kubo, N. Tamura, H. Tsuchiya, M.R de Baar, LHDExperiment Group
JournalNuclear Fusion
Volume58
Issue9
Pagination096036
Abstract

The heat flux is one of the key theoretical concepts used to quantify and understand transport in fusion devices. In this paper, a new method is introduced to calculate the heat flux including its confidence with high accuracy based on perturbed measurements such as the electron temperature. The new method is based on ideal filtering to optimally reduce the noise contributions on the measurements and piece-wise polynomial approximations to calculate the time derivative. Both methods are necessary to arrive at a heat flux and effective diffusion coefficient with high accuracy. The new methodology is applied to a measurement example using ECRH block-wave modulation at the Large Helical Device showing the merit of the newly developed methodology.

DOI10.1088/1741-4326/aad13e
Division

FP

Department

IMT

PID9aecc9fdfa64362d2e98948e554ac487
Alternate TitleNucl. Fusion
LabelOA
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