Fast Heat Pulse Propagation by Turbulence Spreading

Volker Naulin, Jens Juul Rasmussen, Paola Mantica, Diego del-Castillo-Negrete

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    The propagation of a cold pulse initiated by edge cooling in JET is compared to propagation of the heat wave originating from a modulation of the heating source roughly at mid radius. It is found that the propagation of the cold pulse is by far faster than what could be predicted on the basis of the heat wave propagation, and within local transport models no sufficient explanation for this behaviour can be found. Recently, modelling of the cold pulse propagation using non-local effects and a transport equation that uses fractional derivatives has been successfully applied to model the effect [1]. Here we discuss a model in which the non-locality is introduced by the process of turbulence spreading. Transport models with turbulence spreading have been proposed in [2] and conditions under which the perturbation in the turbulence profile could travel at the required high speed from edge to the core have been established [3]. Here we report on recent results in the modelling of cold pulse propagation using turbulence spreading transport models.
    Original languageEnglish
    Title of host publicationProceedings
    Volume8
    PublisherThe Japan Society of Plasma Science and Nuclear Fusion Research
    Publication date2009
    Pages55-58
    Publication statusPublished - 2009
    Event14th International Congress on Plasma Physics (ICPP2008) - Fukuoka (JP), 8-12 Sep.
    Duration: 1 Jan 2008 → …

    Conference

    Conference14th International Congress on Plasma Physics (ICPP2008)
    CityFukuoka (JP), 8-12 Sep.
    Period01/01/2008 → …
    SeriesJournal of Plasma and Fusion Research SERIES
    Number8
    ISSN1883-9630

    Keywords

    • Fusion energy

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