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

    5 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 languageEnglish
    Pages (from-to)445-449
    JournalJournal of Nuclear Materials
    Volume463
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

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

    Cite this

    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.
    @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 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",
    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",
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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

    U2 - 10.1016/j.jnucmat.2014.11.055

    DO - 10.1016/j.jnucmat.2014.11.055

    M3 - Article

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    SP - 445

    EP - 449

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -