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

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, M. Airila, V. Bobkov, L. Colas, P. Jacquet, A. Kirschner, A. Terra, T. M. Biewer, E. Delabie, C. Giroud

Research output: Contribution to journal › Conference article › peer-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 language	English
Article number	014035
Journal	Physica Scripta
Volume	2016
Issue number	T167
DOIs	https://doi.org/10.1088/0031-8949/T167/1/014035
State	Published - 25 Jan 2016
Externally published	Yes
Event	15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France Duration: 18 May 2015 → 22 May 2015

Bibliographical note

Publisher Copyright:
© 2016 EUROfusion.

Funding

Funders	Funder number
Horizon 2020 Framework Programme	633053

Keywords

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

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10.1088/0031-8949/T167/1/014035

Cite this

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title = "Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET",

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.",

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AU - Klepper, C. C.

AU - Borodin, D.

AU - Groth, M.

AU - Lasa, A.

AU - Airila, M.

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.

PY - 2016/1/25

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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

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KW - plasma edge modelling

KW - plasma surface interactions

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

Abstract

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Keywords

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