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

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

doi:10.1088/0031-8949/T167/1/014035

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

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

Research output: Contribution to journal › Article › Scientific › peer-review

17 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 language	English
Article number	014035
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014035
Publication status	Published - 25 Jan 2016
MoE publication type	A1 Journal article-refereed

Keywords

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

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10.1088/0031-8949/T167/1/014035

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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., & JET Contributors (2016). Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET. Physica Scripta, 2016(T167), Article 014035. https://doi.org/10.1088/0031-8949/T167/1/014035

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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.

AU - JET Contributors

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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 - JET tokamak

KW - physical sputtering

KW - plasma edge modelling

KW - plasma surface interactions

KW - RF sheath potentials

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

Abstract

Keywords

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