On the asymmetries of ELM divertor power deposition in JET and ASDEX Upgrade

T. Eich, A. Kallenbach, W. Fundamenski, A. Herrmann, Volker Naulin

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    An analytical expression was derived for describing the divertor target power during ELMs based on the model discussed in [W. Fundamenski, R.A. Pitts, Plasma Phys. Control. Fus. 48 (2006) 109] where the power load arises from a Maxwellian distribution of particles released into the SOL region. The paper discusses a comparable simple extension of the model by introducing a non-zero characteristic velocity of the Maxwellian distributed particles. This way the experimentally observed temporal evolution as well as the in/out energy imbalance can be described. The extended model named free-streaming-particle (FSP) approach predicts a dependence of the ELM in/out energy balance of the pedestal Mach number as well as an inversion of the in/out balance by a change of the field line helicity as observed experimentally. From the FSP approach the value for EτIR (see text) is predicted to be 18–25% in good agreement to the experimental data. A comparison to the various discussed mechanism for the ELM in/out asymmetry is presented.
    Original languageEnglish
    JournalJournal of Nuclear Materials
    Volume390-391
    Pages (from-to)760-763
    ISSN0022-3115
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Fusion energy

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