Impact of nitrogen seeding on confinement and power load control of a high-triangularity JET ELMy H-mode plasma with a metal wall

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    • C. Giroud
    • G. P. Maddison
    • S. Jachmich
    • F. Rimini
    • M. N. A. Beurskens
    • I. Balboa
    • S. Brezinsek
    • R. Coelho
    • J. W. Coenen
    • L. Frassinetti
    • E. Joffrin
    • M. Oberkofler
    • M. Lehnen
    • Y. Liu
    • S. Marsen
    • K. McCormick
    • A. Meigs
    • R. Neu
    • B. Sieglin
    • G. van Rooij
    • G. Arnoux
    • P. Belo
    • M. Brix
    • M. Clever
    • Ivor Coffey
    • S. Devaux
    • D. Douai
    • T. Eich
    • J. Flanagan
    • S. Grunhagen
    • A. Huber
    • M. Kempenaars
    • U. Kruezi
    • K. Lawson
    • P. Lomas
    • C. Lowry
    • I. Nunes
    • A. Sirinnelli
    • A. C. C. Sips
    • M. Stamp
    • S. Wiesen

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    This paper reports the impact on confinement and power load of the high-shape 2.5 MA ELMy H-mode scenario at JET of a change from all carbon plasma-facing components to an all metal wall. In preparation to this change, systematic studies of power load reduction and impact on confinement as a result of fuelling in combination with nitrogen seeding were carried out in JET-C and are compared with their counterpart in JET with a metallic wall. An unexpected and significant change is reported on the decrease in the pedestal confinement but is partially recovered with the injection of nitrogen.

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    DOI

    Original languageEnglish
    Article number113025
    JournalNUCLEAR FUSION
    Journal publication date27 Sep 2013
    Issue number11
    Volume53
    DOIs
    Publication statusPublished - 27 Sep 2013

    ID: 9595089