Influence of the magnetised sheath on the redeposition location of sputtered tungsten and its effect on the net erosion

N. Mellet, J. P. Gunn, B. Pégourié, Antti Hakola, M. Airila, Y. Marandet, P. Roubin

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The effect of the magnetised sheath on tungsten migration and its consequences on net erosion of tungsten plasma facing components are investigated. This study points out a strong effect of the E × B drift on the redeposition location as well as a rapid redeposition of the ejected particles that are ionised close to the surface. A plasma parameter study shows that the migration direction is changed at ≈ 10 eV from opposite to E × B drift at low electron temperature to the same direction as E × B at high electron temperature. Different models have been considered in the case of plasma parameter gradients that are also at the source of a component of the electric field parallel to the surface. New features are observed like an enhanced net erosion peak at the strike point if only the component of the electric field towards the surface is taken into account. When the component parallel to the surface that drives the particles away from or towards the surface is considered, a very different net erosion picture is obtained: a net erosion peak exists between two net deposition regions. This points out the importance of incorporating this effect in simulations.

    Original languageEnglish
    Pages (from-to)488-493
    Number of pages6
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Tungsten
    sheaths
    erosion
    Erosion
    tungsten
    Electron temperature
    Plasmas
    Electric fields
    electron energy
    electric fields
    gradients
    simulation

    Keywords

    • Impurity migration
    • Magnetised sheath
    • Net erosion
    • Redeposition
    • Tungsten

    Cite this

    @article{9d29255f0fe24f218e07ff9040465094,
    title = "Influence of the magnetised sheath on the redeposition location of sputtered tungsten and its effect on the net erosion",
    abstract = "The effect of the magnetised sheath on tungsten migration and its consequences on net erosion of tungsten plasma facing components are investigated. This study points out a strong effect of the E × B drift on the redeposition location as well as a rapid redeposition of the ejected particles that are ionised close to the surface. A plasma parameter study shows that the migration direction is changed at ≈ 10 eV from opposite to E × B drift at low electron temperature to the same direction as E × B at high electron temperature. Different models have been considered in the case of plasma parameter gradients that are also at the source of a component of the electric field parallel to the surface. New features are observed like an enhanced net erosion peak at the strike point if only the component of the electric field towards the surface is taken into account. When the component parallel to the surface that drives the particles away from or towards the surface is considered, a very different net erosion picture is obtained: a net erosion peak exists between two net deposition regions. This points out the importance of incorporating this effect in simulations.",
    keywords = "Impurity migration, Magnetised sheath, Net erosion, Redeposition, Tungsten",
    author = "N. Mellet and Gunn, {J. P.} and B. P{\'e}gouri{\'e} and Antti Hakola and M. Airila and Y. Marandet and P. Roubin",
    year = "2017",
    month = "8",
    day = "1",
    doi = "10.1016/j.nme.2017.03.009",
    language = "English",
    volume = "12",
    pages = "488--493",
    journal = "Nuclear Materials and Energy",
    issn = "2352-1791",
    publisher = "Elsevier",

    }

    Influence of the magnetised sheath on the redeposition location of sputtered tungsten and its effect on the net erosion. / Mellet, N.; Gunn, J. P.; Pégourié, B.; Hakola, Antti; Airila, M.; Marandet, Y.; Roubin, P.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 488-493.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Influence of the magnetised sheath on the redeposition location of sputtered tungsten and its effect on the net erosion

    AU - Mellet, N.

    AU - Gunn, J. P.

    AU - Pégourié, B.

    AU - Hakola, Antti

    AU - Airila, M.

    AU - Marandet, Y.

    AU - Roubin, P.

    PY - 2017/8/1

    Y1 - 2017/8/1

    N2 - The effect of the magnetised sheath on tungsten migration and its consequences on net erosion of tungsten plasma facing components are investigated. This study points out a strong effect of the E × B drift on the redeposition location as well as a rapid redeposition of the ejected particles that are ionised close to the surface. A plasma parameter study shows that the migration direction is changed at ≈ 10 eV from opposite to E × B drift at low electron temperature to the same direction as E × B at high electron temperature. Different models have been considered in the case of plasma parameter gradients that are also at the source of a component of the electric field parallel to the surface. New features are observed like an enhanced net erosion peak at the strike point if only the component of the electric field towards the surface is taken into account. When the component parallel to the surface that drives the particles away from or towards the surface is considered, a very different net erosion picture is obtained: a net erosion peak exists between two net deposition regions. This points out the importance of incorporating this effect in simulations.

    AB - The effect of the magnetised sheath on tungsten migration and its consequences on net erosion of tungsten plasma facing components are investigated. This study points out a strong effect of the E × B drift on the redeposition location as well as a rapid redeposition of the ejected particles that are ionised close to the surface. A plasma parameter study shows that the migration direction is changed at ≈ 10 eV from opposite to E × B drift at low electron temperature to the same direction as E × B at high electron temperature. Different models have been considered in the case of plasma parameter gradients that are also at the source of a component of the electric field parallel to the surface. New features are observed like an enhanced net erosion peak at the strike point if only the component of the electric field towards the surface is taken into account. When the component parallel to the surface that drives the particles away from or towards the surface is considered, a very different net erosion picture is obtained: a net erosion peak exists between two net deposition regions. This points out the importance of incorporating this effect in simulations.

    KW - Impurity migration

    KW - Magnetised sheath

    KW - Net erosion

    KW - Redeposition

    KW - Tungsten

    UR - http://www.scopus.com/inward/record.url?scp=85016209392&partnerID=8YFLogxK

    U2 - 10.1016/j.nme.2017.03.009

    DO - 10.1016/j.nme.2017.03.009

    M3 - Article

    AN - SCOPUS:85016209392

    VL - 12

    SP - 488

    EP - 493

    JO - Nuclear Materials and Energy

    JF - Nuclear Materials and Energy

    SN - 2352-1791

    ER -