First Nitrogen-seeding Experiments in JET with the ITER-like Wall

M. Oberkofler, D. Douai, T. Dittmar, E. Joffrin, S. Brezinsek, J.W. Coenen, S. Grünhagen, A. Drenik, Leena Aho-Mantila, R. Neu, M. Stamp, A. Meigs, G. Calabro, U. Kruezi, A. Martin Rojo, B. Sieglin, M. Brix, S. Marsen, EFDA-JET contributors

    Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

    49 Citations (Scopus)

    Abstract

    In this contribution we present results from the first N2 seeding experiments in JET performed after installation of the ITER-like Wall. Gas balance measurements for seeded L-mode discharges indicate very strong N2 retention as well as a potential increase in D2 retention. The possible influence of ammonia production on this apparent retention is discussed. Plasma parameters and impurity content were monitored throughout the seeded discharges as well as during subsequent clean-up discharges. These experiments give first insight into phenomena related to the use of nitrogen as seeding gas in JET with the ITER-like Wall, such as ammonia production and nitrogen legacy.
    Original languageEnglish
    Pages (from-to)S258-S261
    JournalJournal of Nuclear Materials
    Volume438
    Issue numberSupplement
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA4 Article in a conference publication
    Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
    Duration: 21 May 201225 May 2012

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