Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET

C. C. Klepper, D. Borodin, M. Groth, A. Lasa, M. Airila, V. Bobkov, L. Colas, P. Jacquet, A. Kirschner, A. Terra, T. M. Biewer, E. Delabie, C. Giroud

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    Radio-frequency (RF)-enhanced surface erosion of beryllium (Be) plasma-facing components is explored, for the first time, using the ERO code. The code is applied to measured, RF-enhanced edge Be line emission at JET Be outboard limiters, in the presence of high-power, ion cyclotron-resonance heating (ICRH) in L-mode discharges. In this first modelling study, the RF sheath effect from an ICRH antenna on a magnetically connected, limiter region is simulated by adding a constant potential to the local sheath, in an attempt to match measured increases in local Be I and Be II emission of factors of 2-3. It was found that such increases are readily simulated with added potentials in the range of 100-200 V, which is compatible with expected values for potentials arising from rectification of sheath voltage oscillations from ICRH antennas in the scrape-off layer plasma. Absolute erosion values are also estimated within the uncertainties in local plasma conditions.

    Original languageEnglish
    Article number014035
    JournalPhysica Scripta
    Volume2016
    Issue numberT167
    DOIs
    Publication statusPublished - 25 Jan 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Erosion
    beryllium
    erosion
    Heating
    Antenna
    radio frequencies
    Limiter
    Plasma
    antennas
    cyclotron resonance
    sheaths
    estimates
    Estimate
    Rectification
    heating
    Expected Value
    High Power
    Voltage
    plasma layers
    ions

    Keywords

    • beryllium erosion
    • ERO
    • JET tokamak
    • physical sputtering
    • plasma edge modelling
    • plasma surface interactions
    • RF sheath potentials

    Cite this

    Klepper, C. C. ; Borodin, D. ; Groth, M. ; Lasa, A. ; Airila, M. ; Bobkov, V. ; Colas, L. ; Jacquet, P. ; Kirschner, A. ; Terra, A. ; Biewer, T. M. ; Delabie, E. ; Giroud, C. / Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET. In: Physica Scripta. 2016 ; Vol. 2016, No. T167.
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    abstract = "Radio-frequency (RF)-enhanced surface erosion of beryllium (Be) plasma-facing components is explored, for the first time, using the ERO code. The code is applied to measured, RF-enhanced edge Be line emission at JET Be outboard limiters, in the presence of high-power, ion cyclotron-resonance heating (ICRH) in L-mode discharges. In this first modelling study, the RF sheath effect from an ICRH antenna on a magnetically connected, limiter region is simulated by adding a constant potential to the local sheath, in an attempt to match measured increases in local Be I and Be II emission of factors of 2-3. It was found that such increases are readily simulated with added potentials in the range of 100-200 V, which is compatible with expected values for potentials arising from rectification of sheath voltage oscillations from ICRH antennas in the scrape-off layer plasma. Absolute erosion values are also estimated within the uncertainties in local plasma conditions.",
    keywords = "beryllium erosion, ERO, JET tokamak, physical sputtering, plasma edge modelling, plasma surface interactions, RF sheath potentials",
    author = "Klepper, {C. C.} and D. Borodin and M. Groth and A. Lasa and M. Airila and V. Bobkov and L. Colas and P. Jacquet and A. Kirschner and A. Terra and Biewer, {T. M.} and E. Delabie and C. Giroud",
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    Klepper, CC, Borodin, D, Groth, M, Lasa, A, Airila, M, Bobkov, V, Colas, L, Jacquet, P, Kirschner, A, Terra, A, Biewer, TM, Delabie, E & Giroud, C 2016, 'Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET', Physica Scripta, vol. 2016, no. T167, 014035. https://doi.org/10.1088/0031-8949/T167/1/014035

    Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET. / Klepper, C. C.; Borodin, D.; Groth, M.; Lasa, A.; Airila, M.; Bobkov, V.; Colas, L.; Jacquet, P.; Kirschner, A.; Terra, A.; Biewer, T. M.; Delabie, E.; Giroud, C.

    In: Physica Scripta, Vol. 2016, No. T167, 014035, 25.01.2016.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET

    AU - Klepper, C. C.

    AU - Borodin, D.

    AU - Groth, M.

    AU - Lasa, A.

    AU - Airila, M.

    AU - Bobkov, V.

    AU - Colas, L.

    AU - Jacquet, P.

    AU - Kirschner, A.

    AU - Terra, A.

    AU - Biewer, T. M.

    AU - Delabie, E.

    AU - Giroud, C.

    PY - 2016/1/25

    Y1 - 2016/1/25

    N2 - Radio-frequency (RF)-enhanced surface erosion of beryllium (Be) plasma-facing components is explored, for the first time, using the ERO code. The code is applied to measured, RF-enhanced edge Be line emission at JET Be outboard limiters, in the presence of high-power, ion cyclotron-resonance heating (ICRH) in L-mode discharges. In this first modelling study, the RF sheath effect from an ICRH antenna on a magnetically connected, limiter region is simulated by adding a constant potential to the local sheath, in an attempt to match measured increases in local Be I and Be II emission of factors of 2-3. It was found that such increases are readily simulated with added potentials in the range of 100-200 V, which is compatible with expected values for potentials arising from rectification of sheath voltage oscillations from ICRH antennas in the scrape-off layer plasma. Absolute erosion values are also estimated within the uncertainties in local plasma conditions.

    AB - Radio-frequency (RF)-enhanced surface erosion of beryllium (Be) plasma-facing components is explored, for the first time, using the ERO code. The code is applied to measured, RF-enhanced edge Be line emission at JET Be outboard limiters, in the presence of high-power, ion cyclotron-resonance heating (ICRH) in L-mode discharges. In this first modelling study, the RF sheath effect from an ICRH antenna on a magnetically connected, limiter region is simulated by adding a constant potential to the local sheath, in an attempt to match measured increases in local Be I and Be II emission of factors of 2-3. It was found that such increases are readily simulated with added potentials in the range of 100-200 V, which is compatible with expected values for potentials arising from rectification of sheath voltage oscillations from ICRH antennas in the scrape-off layer plasma. Absolute erosion values are also estimated within the uncertainties in local plasma conditions.

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    KW - ERO

    KW - JET tokamak

    KW - physical sputtering

    KW - plasma edge modelling

    KW - plasma surface interactions

    KW - RF sheath potentials

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    U2 - 10.1088/0031-8949/T167/1/014035

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