Density limit of H-mode plasmas on JET-ILW

A. Huber; S. Brezinsek; G. Sergienko; M. Groth; P. C. De Vries; Leena Aho-Mantila; G. Arnoux; M. Bernert; M. N.A. Beurskens; G. Calabrò; M. Clever; H.G. Esser; C. Guillemaut; S. Jachmich; Aaro Järvinen; Ch. Linsmeier; G. F. Matthews; A.G. Meigs; Ph. Mertens; V. Philipps; M. Stamp; M. Wischmeier; S. Wiesen; JET-EFDA contributors

doi:10.1016/j.jnucmat.2014.11.055

Density limit of H-mode plasmas on JET-ILW

A. Huber^*
, S. Brezinsek
, G. Sergienko
, M. Groth
, P. C. De Vries
, Leena Aho-Mantila
, G. Arnoux
, M. Bernert
, M. N.A. Beurskens
, G. Calabrò
, M. Clever
, H.G. Esser
, C. Guillemaut
, S. Jachmich
, Aaro Järvinen
, Ch. Linsmeier
, G. F. Matthews
, A.G. Meigs
, Ph. Mertens
, V. Philipps

M. Stamp, M. Wischmeier, S. Wiesen, JET-EFDA contributors

^*Corresponding author for this work

Not published at VTT

Research output: Contribution to journal › Article › Scientific › peer-review

12 Citations (Scopus)

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 language	English
Article number	48649
Pages (from-to)	445-449
Journal	Journal of Nuclear Materials
Volume	463
DOIs	https://doi.org/10.1016/j.jnucmat.2014.11.055
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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10.1016/j.jnucmat.2014.11.055

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Huber, A., Brezinsek, S., Sergienko, G., Groth, M., De Vries, P. C., Aho-Mantila, L., Arnoux, G., Bernert, M., Beurskens, M. N. A., Calabrò, G., Clever, M., Esser, H. G., Guillemaut, C., Jachmich, S., Järvinen, A., Linsmeier, C., Matthews, G. F., Meigs, A. G., Mertens, P., ... JET-EFDA contributors (2015). Density limit of H-mode plasmas on JET-ILW. Journal of Nuclear Materials, 463, 445-449. Article 48649. https://doi.org/10.1016/j.jnucmat.2014.11.055

@article{c4f8fbaa9a8745f3bc497f06636ae38b,

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 Leena Aho-Mantila and G. Arnoux and M. Bernert and Beurskens, \{M. N.A.\} and G. Calabr{\`o} and M. Clever and H.G. Esser and C. Guillemaut and S. Jachmich and Aaro J{\"a}rvinen and Ch. Linsmeier and Matthews, \{G. F.\} and A.G. Meigs and Ph. Mertens and V. Philipps and M. Stamp and M. Wischmeier and S. Wiesen and \{JET-EFDA contributors\}",

note = "Funding Information: This work, supported by the European Communities under the contract of Association between EURATOM and FZJ, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: {\textcopyright} 2014 EURATOM.",

year = "2015",

doi = "10.1016/j.jnucmat.2014.11.055",

language = "English",

volume = "463",

pages = "445--449",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

publisher = "Elsevier",

}

Huber, A, Brezinsek, S, Sergienko, G, Groth, M, De Vries, PC, Aho-Mantila, L, Arnoux, G, Bernert, M, Beurskens, MNA, Calabrò, 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 & JET-EFDA contributors 2015, 'Density limit of H-mode plasmas on JET-ILW', Journal of Nuclear Materials, vol. 463, 48649, pp. 445-449. https://doi.org/10.1016/j.jnucmat.2014.11.055

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, Leena

AU - Arnoux, G.

AU - Bernert, M.

AU - Beurskens, M. N.A.

AU - Calabrò, G.

AU - Clever, M.

AU - Esser, H.G.

AU - Guillemaut, C.

AU - Jachmich, S.

AU - Järvinen, Aaro

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 - JET-EFDA contributors

N1 - Funding Information: This work, supported by the European Communities under the contract of Association between EURATOM and FZJ, was carried out within the framework of the European Fusion Development Agreement. The views and opinions expressed herein do not necessarily reflect those of the European Commission. Publisher Copyright: © 2014 EURATOM.

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.scopus.com/pages/publications/84937727111

U2 - 10.1016/j.jnucmat.2014.11.055

DO - 10.1016/j.jnucmat.2014.11.055

M3 - Article

SN - 0022-3115

VL - 463

SP - 445

EP - 449

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

M1 - 48649

ER -

Density limit of H-mode plasmas on JET-ILW

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