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

M. Van Berkel (Corresponding Author), T. Kobayashi, G. Vandersteen, H.J. Zwart, H. Igami, S. Kubo, N. Tamura, H. Tsuchiya, M.R. de Baar

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    Abstract

    The heat flux is one of the key parameter 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 electron cyclotron resonance heating block-wave modulation at the Large Helical Device showing the merit of the newly developed methodology.

    Original languageEnglish
    Article number096036
    Number of pages11
    JournalNuclear Fusion
    Volume58
    Issue number9
    Early online date5 Jul 2018
    DOIs
    Publication statusPublished - 24 Jul 2018

    Keywords

    • Perturbative experiments
    • Transport
    • Diffusion coefficient

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