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arxiv: 1310.8433 · v1 · pith:SCSG2V7Gnew · submitted 2013-10-31 · ⚛️ physics.plasm-ph

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

C Giroud , G P Maddison , S Jachmich , F Rimini , M N A Beurskens , I Balboa , S Brezinsek , R Coelho
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J W Coenen L Frassinetti E Joffrin M Oberkofler M Lehnen Y Liu S Marsen K McCormick K A Meigs R Neu B Sieglin G van Rooij G Arnoux P Belo M Brix M Clever I 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 JET-EFDA Contributors
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classification ⚛️ physics.plasm-ph
keywords confinementchangeimpactloadnitrogenpowerwallelmy
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This paper reports the impact on confinement and power load of the high-shape 2.5MA ELMy H-mode scenario at JET of a change from an 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 to their counterpart in JET with a metallic wall. An unexpected and significant change is reported on the decrease of the pedestal confinement but is partially recovered with the injection of nitrogen.

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