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 journalConference articlepeer-review

17 Scopus citations

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
StatePublished - Jan 25 2016
Event15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France
Duration: May 18 2015May 22 2015

Funding

FundersFunder number
Horizon 2020 Framework Programme633053

    Keywords

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

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