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 cyclotronresonance
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.
