Relevance of collisionality in the transport model assumptions for divertor detachment multi-fluid modelling on JET

S. Wiesen, W. Fundamenski, M. Wischmeier, M. Groth, S. Brezinsek, Volker Naulin

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    A revised formulation of the perpendicular diffusive transport model in 2D multi-fluid edge codes is proposed. Based on theoretical predictions and experimental observations a dependence on collisionality is introduced into the transport model of EDGE2D–EIRENE. The impact on time-dependent JET gas fuelled ramp-up scenario modelling of the full transient from attached divertor into the high-recycling regime, following a target flux roll over into divertor detachment, ultimately ending in a density limit is presented. A strong dependence on divertor geometry is observed which can mask features of the new transport model: a smoothly decaying target recycling flux roll over, an asymmetric drop of temperature and pressure along the field lines as well as macroscopic power dependent plasma oscillations near the density limit which had been previously observed also experimentally. The latter effect is strongest for scenarios with strike points on vertical targets and vanishes in case of asymmetric divertor configurations.
    Original languageEnglish
    JournalJournal of Nuclear Materials
    Volume415
    Issue number1
    Pages (from-to)S535-S539
    ISSN0022-3115
    DOIs
    Publication statusPublished - 2011
    Event19th International Conference on Plasma Surface Interaction in Controlled Fusion - San Diego, United States
    Duration: 24 May 201028 May 2010
    https://fusion.gat.com/conferences/psi2010/

    Conference

    Conference19th International Conference on Plasma Surface Interaction in Controlled Fusion
    Country/TerritoryUnited States
    CitySan Diego
    Period24/05/201028/05/2010
    Internet address

    Keywords

    • Fusion energy

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