Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET

JET-EFDA collaborators

    Research output: Contribution to journalArticleScientificpeer-review

    82 Citations (Scopus)

    Abstract

    Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.
    Original languageEnglish
    Pages (from-to)S42-S47
    Number of pages5
    JournalJournal of Nuclear Materials
    Volume438
    DOIs
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed
    Event20th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Aachen, Aachen, Germany
    Duration: 21 May 201225 May 2012

    Fingerprint

    Tungsten
    erosion
    Sputtering
    Erosion
    tungsten
    sputtering
    Metals
    metals
    Beryllium
    plasma temperature
    inoculation
    beryllium
    Nitrogen
    signatures
    Spectroscopy
    Impurities
    Plasmas
    Heating
    nitrogen
    impurities

    Cite this

    @article{f880c84b6e9341de86214356fcfd5a8b,
    title = "Tungsten divertor erosion in all metal devices: Lessons from the ITER like wall of JET",
    abstract = "Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50{\%} redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.",
    author = "{van Rooij}, G.J. and J.W. Coenen and Leena Aho-Mantila and S. Brezinsek and M. Clever and R. Dux and K. Krieger and S. Marsen and M. Groth and G.F. Matthews and A. Meigs and R. Neu and S. Potzel and T. P{\"u}tterich and J. Rapp and M.F. Stamp and {JET-EFDA collaborators}",
    year = "2013",
    doi = "10.1016/j.jnucmat.2013.01.007",
    language = "English",
    volume = "438",
    pages = "S42--S47",
    journal = "Journal of Nuclear Materials",
    issn = "0022-3115",
    publisher = "Elsevier",

    }

    Tungsten divertor erosion in all metal devices : Lessons from the ITER like wall of JET. / JET-EFDA collaborators.

    In: Journal of Nuclear Materials, Vol. 438, 2013, p. S42-S47.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Tungsten divertor erosion in all metal devices

    T2 - Lessons from the ITER like wall of JET

    AU - van Rooij, G.J.

    AU - Coenen, J.W.

    AU - Aho-Mantila, Leena

    AU - Brezinsek, S.

    AU - Clever, M.

    AU - Dux, R.

    AU - Krieger, K.

    AU - Marsen, S.

    AU - Groth, M.

    AU - Matthews, G.F.

    AU - Meigs, A.

    AU - Neu, R.

    AU - Potzel, S.

    AU - Pütterich, T.

    AU - Rapp, J.

    AU - Stamp, M.F.

    AU - JET-EFDA collaborators

    PY - 2013

    Y1 - 2013

    N2 - Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.

    AB - Tungsten erosion in the outer divertor of the JET ITER like wall was quantified by spectroscopy. Effective sputtering yields of typically 10−4 were measured in L-mode at ∼30 eV attached divertor conditions and beryllium was identified as the main cause of sputtering. The signature of prompt redeposition was observed in the analysis of WI 400.9 nm and WII 364 nm line ratios and indicative of >50% redeposition fractions. Inter- and intra-ELM sputtering were compared for an example of 10 Hz ELMs with 13 MW NBI heating, in which intra-ELM sputtering was found to dominate by a factor of 5. Nitrogen seeding initially increased the tungsten sputtering threefold due to higher extrinsic impurity levels and effectively reduced the tungsten sputtering when the divertor plasma temperature was decreased from the initial 25 eV down to 15 eV.

    U2 - 10.1016/j.jnucmat.2013.01.007

    DO - 10.1016/j.jnucmat.2013.01.007

    M3 - Article

    VL - 438

    SP - S42-S47

    JO - Journal of Nuclear Materials

    JF - Journal of Nuclear Materials

    SN - 0022-3115

    ER -