Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET

G. P. Maddison; C. Giroud; G. K. McCormick; J. A. Alonso; B. Alper; G. Arnoux; P. C. Da Silva Aresta Belo; M. N.A. Beurskens; A. Boboc; S. Brezinsek; I. Coffey; S. Devaux; T. Eich; W. Fundamenski; D. Harting; A. Huber; S. Jachmich; I. Jenkins; E. Joffrin; M. A.H. Kempenaars; M. Lehnen; T. Loarer; P. J. Lomas; A. G. Meigs; P. D. Morgan; V. Riccardo; F. G. Rimini; M. F. Stamp; G. Telesca; H. Thomsen

doi:10.1088/0029-5515/51/4/042001

Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET

G. P. Maddison, C. Giroud, G. K. McCormick, J. A. Alonso, B. Alper, G. Arnoux, P. C. Da Silva Aresta Belo, M. N.A. Beurskens, A. Boboc, S. Brezinsek, I. Coffey, S. Devaux, T. Eich, W. Fundamenski, D. Harting, A. Huber, S. Jachmich, I. Jenkins, E. Joffrin, M. A.H. KempenaarsM. Lehnen, T. Loarer, P. J. Lomas, A. G. Meigs, P. D. Morgan, V. Riccardo, F. G. Rimini, M. F. Stamp, G. Telesca, H. Thomsen

Laboratory for Plasma Physics

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Abstract

In anticipation of revised operational limits accompanying upgrade of the JET tokamak to an all-metal, ITER-like wall, systematic studies have been conducted of moderating divertor heat load in type I ELMy H-mode by enhanced deuterium fuelling and seeding with the extrinsic impurities neon or nitrogen. These were found to differ mainly in the roughly ten times higher level of nitrogen than neon presently required to approach outboard detachment, and in their effects upon ELMs. With either species up to input power of ≈17 MW, strongly reduced target loads between ELMs, compatible with the new wall, were sustained for longer than 10 energy confinement times while losing <10% of normalized energy confinement and keeping density above 90% of the Greenwald value. At the highest nitrogen levels, ELMs were also markedly decreased in size, yielding a regime still with reasonable confinement plus attenuated exhaust both between and during ELMs.

Original language	English
Article number	042001
Journal	Nuclear Fusion
Volume	51
Issue number	4
DOIs	https://doi.org/10.1088/0029-5515/51/4/042001
Publication status	Published - Apr 2011

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Maddison, G. P., Giroud, C., McCormick, G. K., Alonso, J. A., Alper, B., Arnoux, G., Da Silva Aresta Belo, P. C., Beurskens, M. N. A., Boboc, A., Brezinsek, S., Coffey, I., Devaux, S., Eich, T., Fundamenski, W., Harting, D., Huber, A., Jachmich, S., Jenkins, I., Joffrin, E., ... Thomsen, H. (2011). Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET. Nuclear Fusion, 51(4), Article 042001. https://doi.org/10.1088/0029-5515/51/4/042001

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title = "Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET",

abstract = "In anticipation of revised operational limits accompanying upgrade of the JET tokamak to an all-metal, ITER-like wall, systematic studies have been conducted of moderating divertor heat load in type I ELMy H-mode by enhanced deuterium fuelling and seeding with the extrinsic impurities neon or nitrogen. These were found to differ mainly in the roughly ten times higher level of nitrogen than neon presently required to approach outboard detachment, and in their effects upon ELMs. With either species up to input power of ≈17 MW, strongly reduced target loads between ELMs, compatible with the new wall, were sustained for longer than 10 energy confinement times while losing <10% of normalized energy confinement and keeping density above 90% of the Greenwald value. At the highest nitrogen levels, ELMs were also markedly decreased in size, yielding a regime still with reasonable confinement plus attenuated exhaust both between and during ELMs.",

author = "Maddison, {G. P.} and C. Giroud and McCormick, {G. K.} and Alonso, {J. A.} and B. Alper and G. Arnoux and {Da Silva Aresta Belo}, {P. C.} and Beurskens, {M. N.A.} and A. Boboc and S. Brezinsek and I. Coffey and S. Devaux and T. Eich and W. Fundamenski and D. Harting and A. Huber and S. Jachmich and I. Jenkins and E. Joffrin and Kempenaars, {M. A.H.} and M. Lehnen and T. Loarer and Lomas, {P. J.} and Meigs, {A. G.} and Morgan, {P. D.} and V. Riccardo and Rimini, {F. G.} and Stamp, {M. F.} and G. Telesca and H. Thomsen",

year = "2011",

month = apr,

doi = "10.1088/0029-5515/51/4/042001",

language = "English",

volume = "51",

journal = "Nuclear Fusion",

issn = "0029-5515",

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Maddison, GP, Giroud, C, McCormick, GK, Alonso, JA, Alper, B, Arnoux, G, Da Silva Aresta Belo, PC, Beurskens, MNA, Boboc, A, Brezinsek, S, Coffey, I, Devaux, S, Eich, T, Fundamenski, W, Harting, D, Huber, A, Jachmich, S, Jenkins, I, Joffrin, E, Kempenaars, MAH, Lehnen, M, Loarer, T, Lomas, PJ, Meigs, AG, Morgan, PD, Riccardo, V, Rimini, FG, Stamp, MF, Telesca, G & Thomsen, H 2011, 'Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET', Nuclear Fusion, vol. 51, no. 4, 042001. https://doi.org/10.1088/0029-5515/51/4/042001

TY - JOUR

T1 - Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET

AU - Maddison, G. P.

AU - Giroud, C.

AU - McCormick, G. K.

AU - Alonso, J. A.

AU - Alper, B.

AU - Arnoux, G.

AU - Da Silva Aresta Belo, P. C.

AU - Beurskens, M. N.A.

AU - Boboc, A.

AU - Brezinsek, S.

AU - Coffey, I.

AU - Devaux, S.

AU - Eich, T.

AU - Fundamenski, W.

AU - Harting, D.

AU - Huber, A.

AU - Jachmich, S.

AU - Jenkins, I.

AU - Joffrin, E.

AU - Kempenaars, M. A.H.

AU - Lehnen, M.

AU - Loarer, T.

AU - Lomas, P. J.

AU - Meigs, A. G.

AU - Morgan, P. D.

AU - Riccardo, V.

AU - Rimini, F. G.

AU - Stamp, M. F.

AU - Telesca, G.

AU - Thomsen, H.

PY - 2011/4

Y1 - 2011/4

N2 - In anticipation of revised operational limits accompanying upgrade of the JET tokamak to an all-metal, ITER-like wall, systematic studies have been conducted of moderating divertor heat load in type I ELMy H-mode by enhanced deuterium fuelling and seeding with the extrinsic impurities neon or nitrogen. These were found to differ mainly in the roughly ten times higher level of nitrogen than neon presently required to approach outboard detachment, and in their effects upon ELMs. With either species up to input power of ≈17 MW, strongly reduced target loads between ELMs, compatible with the new wall, were sustained for longer than 10 energy confinement times while losing <10% of normalized energy confinement and keeping density above 90% of the Greenwald value. At the highest nitrogen levels, ELMs were also markedly decreased in size, yielding a regime still with reasonable confinement plus attenuated exhaust both between and during ELMs.

AB - In anticipation of revised operational limits accompanying upgrade of the JET tokamak to an all-metal, ITER-like wall, systematic studies have been conducted of moderating divertor heat load in type I ELMy H-mode by enhanced deuterium fuelling and seeding with the extrinsic impurities neon or nitrogen. These were found to differ mainly in the roughly ten times higher level of nitrogen than neon presently required to approach outboard detachment, and in their effects upon ELMs. With either species up to input power of ≈17 MW, strongly reduced target loads between ELMs, compatible with the new wall, were sustained for longer than 10 energy confinement times while losing <10% of normalized energy confinement and keeping density above 90% of the Greenwald value. At the highest nitrogen levels, ELMs were also markedly decreased in size, yielding a regime still with reasonable confinement plus attenuated exhaust both between and during ELMs.

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DO - 10.1088/0029-5515/51/4/042001

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AN - SCOPUS:79953723197

SN - 0029-5515

VL - 51

JO - Nuclear Fusion

JF - Nuclear Fusion

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M1 - 042001

ER -

Moderation of divertor heat loads by fuelling and impurity seeding in well-confined ELMy H-mode plasmas on JET

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