Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Forschungszentrum Julich (Germany)
- Aalto Univ., Otaniemi (Finland)
- VTT Technical Research Centre of Finland (Finland)
- Max Planck Inst. for Plasma Physics, Garching (Germany)
- Alternative Energies and Atomic Energy Commission (CEA) (France)
- Culham Science Centre, Abingdon (United Kingdom). Culham Centre for Fusion Energy (CCFE), EURATOM/UKAEA Fusion Association
Radio-frequency (RF)-enhanced surface erosion of beryllium (Be) plasma-facing components is explored, for the first time, using the ERO code. We applied the code in order to measure the 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. We also estimated absolute erosion values within the uncertainties in local plasma conditions.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Contributing Organization:
- JET Contributors8
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1344255
- Alternate ID(s):
- OSTI ID: 1234979
- Journal Information:
- Physica Scripta, Vol. T167; ISSN 0031-8949
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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