Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO

F. Subba, L. Aho-Mantila, R. Ambrosino, D.P. Coster, V. Pericoli-Ridolfini, A. Uccello, R. Zanino

    Research output: Contribution to journalArticleScientificpeer-review

    4 Citations (Scopus)

    Abstract

    The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully from ITER to a fusion power plant. We used the SOLPS code to produce a preliminary analysis of two such configurations, the X-Divertor (XD) and the Super X-Divertor (SX), and compare them to the SN solution. Considering the nominal power flowing into the SOL (PSOL = 150 MW), we estimated the amplitude of the acceptable DEMO operational space. The acceptability criterion was chosen as plasma temperature at the target lower than 5eV, providing low sputtering and at least partial detachment, while the operational space was defined in terms of the electron density at the outboard mid-plane separatrix and of the seeded impurity (Ar only in the present study) concentration. It was found that both the XD and the SXD extend the DEMO operational space, although the advantages detected so far are not dramatic. The most promising configuration seems to be the XD, which can produce acceptable target temperatures at moderate outboard mid-plane electron density (nomp=4.5*1019 m-3) and Zeff = 1.3.
    Original languageEnglish
    Pages (from-to)967-972
    Number of pages6
    JournalNuclear Materials and Energy
    Volume12
    DOIs
    Publication statusPublished - 1 Aug 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Carrier concentration
    configurations
    Sputtering
    Power plants
    Fusion reactions
    Impurities
    Plasmas
    Temperature
    backups
    plasma temperature
    power plants
    detachment
    acceptability
    fusion
    sputtering
    impurities
    temperature

    Keywords

    • advanced divertor
    • DEMO
    • detachment
    • numerical modeling

    Cite this

    Subba, F., Aho-Mantila, L., Ambrosino, R., Coster, D. P., Pericoli-Ridolfini, V., Uccello, A., & Zanino, R. (2017). Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. Nuclear Materials and Energy, 12, 967-972. https://doi.org/10.1016/j.nme.2017.04.003
    Subba, F. ; Aho-Mantila, L. ; Ambrosino, R. ; Coster, D.P. ; Pericoli-Ridolfini, V. ; Uccello, A. ; Zanino, R. / Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 967-972.
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    abstract = "The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully from ITER to a fusion power plant. We used the SOLPS code to produce a preliminary analysis of two such configurations, the X-Divertor (XD) and the Super X-Divertor (SX), and compare them to the SN solution. Considering the nominal power flowing into the SOL (PSOL = 150 MW), we estimated the amplitude of the acceptable DEMO operational space. The acceptability criterion was chosen as plasma temperature at the target lower than 5eV, providing low sputtering and at least partial detachment, while the operational space was defined in terms of the electron density at the outboard mid-plane separatrix and of the seeded impurity (Ar only in the present study) concentration. It was found that both the XD and the SXD extend the DEMO operational space, although the advantages detected so far are not dramatic. The most promising configuration seems to be the XD, which can produce acceptable target temperatures at moderate outboard mid-plane electron density (nomp=4.5*1019 m-3) and Zeff = 1.3.",
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    Subba, F, Aho-Mantila, L, Ambrosino, R, Coster, DP, Pericoli-Ridolfini, V, Uccello, A & Zanino, R 2017, 'Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO', Nuclear Materials and Energy, vol. 12, pp. 967-972. https://doi.org/10.1016/j.nme.2017.04.003

    Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO. / Subba, F.; Aho-Mantila, L.; Ambrosino, R.; Coster, D.P.; Pericoli-Ridolfini, V.; Uccello, A.; Zanino, R.

    In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 967-972.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - Preliminary analysis of the efficiency of non-standard divertor configurations in DEMO

    AU - Subba, F.

    AU - Aho-Mantila, L.

    AU - Ambrosino, R.

    AU - Coster, D.P.

    AU - Pericoli-Ridolfini, V.

    AU - Uccello, A.

    AU - Zanino, R.

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    AB - The standard Single Null (SN) divertor is currently expected to be installed in DEMO. However, a number of alternative configurations are being evaluated in parallel as backup solutions, in case the standard divertor does not extrapolate successfully from ITER to a fusion power plant. We used the SOLPS code to produce a preliminary analysis of two such configurations, the X-Divertor (XD) and the Super X-Divertor (SX), and compare them to the SN solution. Considering the nominal power flowing into the SOL (PSOL = 150 MW), we estimated the amplitude of the acceptable DEMO operational space. The acceptability criterion was chosen as plasma temperature at the target lower than 5eV, providing low sputtering and at least partial detachment, while the operational space was defined in terms of the electron density at the outboard mid-plane separatrix and of the seeded impurity (Ar only in the present study) concentration. It was found that both the XD and the SXD extend the DEMO operational space, although the advantages detected so far are not dramatic. The most promising configuration seems to be the XD, which can produce acceptable target temperatures at moderate outboard mid-plane electron density (nomp=4.5*1019 m-3) and Zeff = 1.3.

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