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 journalArticleScientificpeer-review

5 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 languageEnglish
Article number014035
JournalPhysica Scripta
Volume2016
Issue numberT167
DOIs
Publication statusPublished - 25 Jan 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Erosion
beryllium
erosion
Heating
Antenna
radio frequencies
Limiter
Plasma
antennas
cyclotron resonance
sheaths
estimates
Estimate
Rectification
heating
Expected Value
High Power
Voltage
plasma layers
ions

Keywords

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

Cite this

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. / Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET. In: Physica Scripta. 2016 ; Vol. 2016, No. T167.
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Klepper, CC, Borodin, D, Groth, M, Lasa, A, Airila, M, Bobkov, V, Colas, L, Jacquet, P, Kirschner, A, Terra, A, Biewer, TM, Delabie, E & Giroud, C 2016, 'Estimates of RF-induced erosion at antenna-connected beryllium plasma-facing components in JET', Physica Scripta, vol. 2016, no. T167, 014035. https://doi.org/10.1088/0031-8949/T167/1/014035

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

In: Physica Scripta, Vol. 2016, No. T167, 014035, 25.01.2016.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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.

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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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