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

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

doi:10.1088/0029-5515/53/11/113025

Journal Article

FZJ-2014-03602

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

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

2013
IAEA Vienna

Nuclear fusion 53(11), 113025 - (2013) [10.1088/0029-5515/53/11/113025]

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Please use a persistent id in citations: doi:10.1088/0029-5515/53/11/113025

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.

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