Density limit of H-mode plasmas on JET-ILW

A. Huber (Corresponding Author), S. Brezinsek, G. Sergienko, M. Groth, P.C. de Vries, L. Aho-Mantila, G. Arnoux, M. Bernert, M.N.A. Beurskens, G. Calabro, M. Clever, H.G. Esser, C. Guillemaut, S. Jachmich, A. Järvinen, Ch. Linsmeier, G.F. Matthews, A.G. Meigs, Ph. Mertens, V. PhilippsM. Stamp, M. Wischmeier, S. Wiesen, JET-EFDA contributors

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

High-density discharges on JET with ITER-like Wall (ILW) have been analysed with the aim of establishing a mechanism for the H-mode density limit (DL) and compared with experiments in the JET carbon material configuration. The density limit is up to 20% higher in the JET-ILW than in the JET-C machine. The observed H-mode density limit is found close to the Greenwald limit. It is sensitive to the main plasma shape and is almost independent of the heating power. It has been observed that the transition from H-mode to L-mode is not always an abrupt event but may exhibit a series of H-L-H transitions, the so-called "dithering H-mode". It was observed that detachment, as well as the X-point MARFE itself, does not trigger the H-L transition and thus does not present a limit on the plasma density and that it is the plasma confinement which is ultimately responsible for the H-mode DL.
Original languageEnglish
Pages (from-to)445-449
JournalJournal of Nuclear Materials
Volume463
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Plasma confinement
Plasma density
Carbon
Plasmas
Heating
Experiments
plasma control
detachment
plasma density
actuators
heating
carbon
configurations

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Huber, A., Brezinsek, S., Sergienko, G., Groth, M., de Vries, P. C., Aho-Mantila, L., ... contributors, JET-EFDA. (2015). Density limit of H-mode plasmas on JET-ILW. Journal of Nuclear Materials, 463, 445-449. https://doi.org/10.1016/j.jnucmat.2014.11.055
Huber, A. ; Brezinsek, S. ; Sergienko, G. ; Groth, M. ; de Vries, P.C. ; Aho-Mantila, L. ; Arnoux, G. ; Bernert, M. ; Beurskens, M.N.A. ; Calabro, G. ; Clever, M. ; Esser, H.G. ; Guillemaut, C. ; Jachmich, S. ; Järvinen, A. ; Linsmeier, Ch. ; Matthews, G.F. ; Meigs, A.G. ; Mertens, Ph. ; Philipps, V. ; Stamp, M. ; Wischmeier, M. ; Wiesen, S. ; contributors, JET-EFDA. / Density limit of H-mode plasmas on JET-ILW. In: Journal of Nuclear Materials. 2015 ; Vol. 463. pp. 445-449.
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title = "Density limit of H-mode plasmas on JET-ILW",
abstract = "High-density discharges on JET with ITER-like Wall (ILW) have been analysed with the aim of establishing a mechanism for the H-mode density limit (DL) and compared with experiments in the JET carbon material configuration. The density limit is up to 20{\%} higher in the JET-ILW than in the JET-C machine. The observed H-mode density limit is found close to the Greenwald limit. It is sensitive to the main plasma shape and is almost independent of the heating power. It has been observed that the transition from H-mode to L-mode is not always an abrupt event but may exhibit a series of H-L-H transitions, the so-called {"}dithering H-mode{"}. It was observed that detachment, as well as the X-point MARFE itself, does not trigger the H-L transition and thus does not present a limit on the plasma density and that it is the plasma confinement which is ultimately responsible for the H-mode DL.",
author = "A. Huber and S. Brezinsek and G. Sergienko and M. Groth and {de Vries}, P.C. and L. Aho-Mantila and G. Arnoux and M. Bernert and M.N.A. Beurskens and G. Calabro and M. Clever and H.G. Esser and C. Guillemaut and S. Jachmich and A. J{\"a}rvinen and Ch. Linsmeier and G.F. Matthews and A.G. Meigs and Ph. Mertens and V. Philipps and M. Stamp and M. Wischmeier and S. Wiesen and JET-EFDA contributors",
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Huber, A, Brezinsek, S, Sergienko, G, Groth, M, de Vries, PC, Aho-Mantila, L, Arnoux, G, Bernert, M, Beurskens, MNA, Calabro, G, Clever, M, Esser, HG, Guillemaut, C, Jachmich, S, Järvinen, A, Linsmeier, C, Matthews, GF, Meigs, AG, Mertens, P, Philipps, V, Stamp, M, Wischmeier, M, Wiesen, S & contributors, JET-EFDA 2015, 'Density limit of H-mode plasmas on JET-ILW', Journal of Nuclear Materials, vol. 463, pp. 445-449. https://doi.org/10.1016/j.jnucmat.2014.11.055

Density limit of H-mode plasmas on JET-ILW. / Huber, A. (Corresponding Author); Brezinsek, S.; Sergienko, G.; Groth, M.; de Vries, P.C.; Aho-Mantila, L.; Arnoux, G.; Bernert, M.; Beurskens, M.N.A.; Calabro, G.; Clever, M.; Esser, H.G.; Guillemaut, C.; Jachmich, S.; Järvinen, A.; Linsmeier, Ch.; Matthews, G.F.; Meigs, A.G.; Mertens, Ph.; Philipps, V.; Stamp, M.; Wischmeier, M.; Wiesen, S.; contributors, JET-EFDA.

In: Journal of Nuclear Materials, Vol. 463, 2015, p. 445-449.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Density limit of H-mode plasmas on JET-ILW

AU - Huber, A.

AU - Brezinsek, S.

AU - Sergienko, G.

AU - Groth, M.

AU - de Vries, P.C.

AU - Aho-Mantila, L.

AU - Arnoux, G.

AU - Bernert, M.

AU - Beurskens, M.N.A.

AU - Calabro, G.

AU - Clever, M.

AU - Esser, H.G.

AU - Guillemaut, C.

AU - Jachmich, S.

AU - Järvinen, A.

AU - Linsmeier, Ch.

AU - Matthews, G.F.

AU - Meigs, A.G.

AU - Mertens, Ph.

AU - Philipps, V.

AU - Stamp, M.

AU - Wischmeier, M.

AU - Wiesen, S.

AU - contributors, JET-EFDA

PY - 2015

Y1 - 2015

N2 - High-density discharges on JET with ITER-like Wall (ILW) have been analysed with the aim of establishing a mechanism for the H-mode density limit (DL) and compared with experiments in the JET carbon material configuration. The density limit is up to 20% higher in the JET-ILW than in the JET-C machine. The observed H-mode density limit is found close to the Greenwald limit. It is sensitive to the main plasma shape and is almost independent of the heating power. It has been observed that the transition from H-mode to L-mode is not always an abrupt event but may exhibit a series of H-L-H transitions, the so-called "dithering H-mode". It was observed that detachment, as well as the X-point MARFE itself, does not trigger the H-L transition and thus does not present a limit on the plasma density and that it is the plasma confinement which is ultimately responsible for the H-mode DL.

AB - High-density discharges on JET with ITER-like Wall (ILW) have been analysed with the aim of establishing a mechanism for the H-mode density limit (DL) and compared with experiments in the JET carbon material configuration. The density limit is up to 20% higher in the JET-ILW than in the JET-C machine. The observed H-mode density limit is found close to the Greenwald limit. It is sensitive to the main plasma shape and is almost independent of the heating power. It has been observed that the transition from H-mode to L-mode is not always an abrupt event but may exhibit a series of H-L-H transitions, the so-called "dithering H-mode". It was observed that detachment, as well as the X-point MARFE itself, does not trigger the H-L transition and thus does not present a limit on the plasma density and that it is the plasma confinement which is ultimately responsible for the H-mode DL.

UR - https://www.sciencedirect.com/journal/journal-of-nuclear-materials/vol/463/suppl/C

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DO - 10.1016/j.jnucmat.2014.11.055

M3 - Article

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EP - 449

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -