Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor

J.P. Coad, Jari Likonen, M. Rubel, Elizaveta Vainonen-Ahlgren, D.E. Hole, T. Sajavaara, Tommi Renvall, G.F. Matthews, JET-EFDA Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    78 Citations (Scopus)

    Abstract

    In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.
    Original languageEnglish
    Pages (from-to)350-366
    Number of pages17
    JournalNuclear Fusion
    Volume46
    Issue number2
    DOIs
    Publication statusPublished - 2006
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    boxes
    erosion
    tiles
    gases
    markers
    tracers
    methane
    deposits
    asymmetry
    injection
    impurities
    carbon

    Keywords

    • JET
    • plasma
    • fusion energy
    • fusion reactors
    • ITER
    • Tokamak
    • divertor
    • divertor plasma

    Cite this

    Coad, J. P., Likonen, J., Rubel, M., Vainonen-Ahlgren, E., Hole, D. E., Sajavaara, T., ... JET-EFDA Contributors (2006). Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. Nuclear Fusion, 46(2), 350-366. https://doi.org/10.1088/0029-5515/46/2/018
    Coad, J.P. ; Likonen, Jari ; Rubel, M. ; Vainonen-Ahlgren, Elizaveta ; Hole, D.E. ; Sajavaara, T. ; Renvall, Tommi ; Matthews, G.F. ; JET-EFDA Contributors. / Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. In: Nuclear Fusion. 2006 ; Vol. 46, No. 2. pp. 350-366.
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    title = "Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor",
    abstract = "In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.",
    keywords = "JET, plasma, fusion energy, fusion reactors, ITER, Tokamak, divertor, divertor plasma",
    author = "J.P. Coad and Jari Likonen and M. Rubel and Elizaveta Vainonen-Ahlgren and D.E. Hole and T. Sajavaara and Tommi Renvall and G.F. Matthews and {JET-EFDA Contributors}",
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    Coad, JP, Likonen, J, Rubel, M, Vainonen-Ahlgren, E, Hole, DE, Sajavaara, T, Renvall, T, Matthews, GF & JET-EFDA Contributors 2006, 'Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor', Nuclear Fusion, vol. 46, no. 2, pp. 350-366. https://doi.org/10.1088/0029-5515/46/2/018

    Overview of material re-deposition and fuel retention studies at JET with the Gas Box divertor. / Coad, J.P.; Likonen, Jari; Rubel, M.; Vainonen-Ahlgren, Elizaveta; Hole, D.E.; Sajavaara, T.; Renvall, Tommi; Matthews, G.F.; JET-EFDA Contributors.

    In: Nuclear Fusion, Vol. 46, No. 2, 2006, p. 350-366.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Coad, J.P.

    AU - Likonen, Jari

    AU - Rubel, M.

    AU - Vainonen-Ahlgren, Elizaveta

    AU - Hole, D.E.

    AU - Sajavaara, T.

    AU - Renvall, Tommi

    AU - Matthews, G.F.

    AU - JET-EFDA Contributors,

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    N2 - In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.

    AB - In the period 1998—2001 the JET tokamak was operated with the MkII Gas Box divertor. On two occasions during that period a number of limiter and divertor tiles were retrieved from the torus and then examined ex situ with surface sensitive techniques. Erosion and deposition patterns were determined in order to assess the material erosion, material migration and fuel inventory on plasma facing components. Tracer techniques, e.g. injection of 13C labelled methane and tiles coated with a low-Z and high-Z marker layer, were used to enhance the volume of information on the material transport. The results show significant asymmetry in the distribution of fuel and plasma impurity species between the inner (net deposition area) and the outer (net erosion) divertor channels. No significant formation of highly hydrogenated carbon films has been found in the Gas Box structure. The important processes for material migration, and the influence of operation scenarios on the morphology of the deposits are discussed. Comparison is also made with results obtained following previous divertor campaigns.

    KW - JET

    KW - plasma

    KW - fusion energy

    KW - fusion reactors

    KW - ITER

    KW - Tokamak

    KW - divertor

    KW - divertor plasma

    U2 - 10.1088/0029-5515/46/2/018

    DO - 10.1088/0029-5515/46/2/018

    M3 - Article

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    JO - Nuclear Fusion

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    SN - 0029-5515

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    ER -