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, 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 RooijG. 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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Abstract

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

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Giroud, C., Maddison, G. P., Jachmich, S., Rimini, F., Beurskens, M. N. A., Balboa, I., Brezinsek, S., Coelho, R., Coenen, J. W., Frassinetti, L., Joffrin, E., Oberkofler, M., Lehnen, M., Liu, Y., Marsen, S., McCormick, K., Meigs, A., Neu, R., Sieglin, B., ... Wiesen, S. (2013). Impact of nitrogen seeding on confinement and power load control of a high-triangularity JET ELMy H-mode plasma with a metal wall. NUCLEAR FUSION, 53(11), [113025]. https://doi.org/10.1088/0029-5515/53/11/113025