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

Diagnostics and Control

Research output: Contribution to journal › Conference article › peer-review

20 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 - Jan 25 2016
Event	15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015 - Aix-en-Provence, France Duration: May 18 2015 → May 22 2015

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

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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.",

keywords = "ERO, JET tokamak, RF sheath potentials, beryllium erosion, physical sputtering, plasma edge modelling, plasma surface interactions",

author = "Klepper, {C. C.} and D. Borodin and M. Groth and A. Lasa and M. Airila and V. Bobkov and L. Colas and P. Jacquet and A. Kirschner and A. Terra and Biewer, {T. M.} and E. Delabie and C. Giroud",

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T1 - Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET

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

Y1 - 2016/1/25

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.

KW - ERO

KW - JET tokamak

KW - RF sheath potentials

KW - beryllium erosion

KW - physical sputtering

KW - plasma edge modelling

KW - plasma surface interactions

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U2 - 10.1088/0031-8949/T167/1/014035

DO - 10.1088/0031-8949/T167/1/014035

M3 - Conference article

AN - SCOPUS:84959901018

SN - 0281-1847

VL - 2016

JO - Physica Scripta

JF - Physica Scripta

IS - T167

M1 - 014035

T2 - 15th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2015

Y2 - 18 May 2015 through 22 May 2015

ER -

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

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