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

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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
Number of pages7
JournalPHYSICA SCRIPTA: TOPICAL ISSUES
Volume2016
DOIs
Publication statusPublished - 25 Jan 2016
MoE publication typeA1 Journal article-refereed
EventInternational Conference on Plasma-Facing Materials and Components for Fusion Applications - Aix-en-Provence, France
Duration: 18 May 201522 May 2015
Conference number: 15

Keywords

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

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