An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW

JET Contributors

doi:10.1016/j.nme.2017.03.031

An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW

JET Contributors

Fusion Engineering

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

16 Scopus citations

Abstract

For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux.

Original language	English
Pages (from-to)	341-345
Number of pages	5
Journal	Nuclear Materials and Energy
Volume	12
DOIs	https://doi.org/10.1016/j.nme.2017.03.031
State	Published - Aug 2017

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014–2018 under grant agreement No 633053 and was supported by contract №14.Y26.31.0008 with the Ministry of Education and Science of the Russian Federation. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been initiated within the MEPhi – FZJ strategic partnership.

Keywords

Beryllium
ELM
Electric field
Erosion
ITER-like wall
JET
Oblique magnetic field
Plasma-surface interaction

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.nme.2017.03.031

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title = "An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW",

abstract = "For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux.",

keywords = "Beryllium, ELM, Electric field, Erosion, ITER-like wall, JET, Oblique magnetic field, Plasma-surface interaction",

author = "{JET Contributors} and I. Borodkina and D. Borodin and S. Brezinsek and A. Kirschner and Tsvetkov, {I. V.} and Kurnaev, {V. A.} and V. Bobkov and Klepper, {C. C.} and A. Lasa and C. Guillemaut and P. Jacquet and Stamp, {M. F.} and C. Giroud and S. Silburn and I. Balboa and E. Solano",

note = "Publisher Copyright: {\textcopyright} 2017",

year = "2017",

month = aug,

doi = "10.1016/j.nme.2017.03.031",

language = "English",

volume = "12",

pages = "341--345",

journal = "Nuclear Materials and Energy",

issn = "2352-1791",

publisher = "Elsevier",

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T1 - An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW

AU - JET Contributors

AU - Borodkina, I.

AU - Borodin, D.

AU - Brezinsek, S.

AU - Kirschner, A.

AU - Tsvetkov, I. V.

AU - Kurnaev, V. A.

AU - Bobkov, V.

AU - Klepper, C. C.

AU - Lasa, A.

AU - Guillemaut, C.

AU - Jacquet, P.

AU - Stamp, M. F.

AU - Giroud, C.

AU - Silburn, S.

AU - Balboa, I.

AU - Solano, E.

PY - 2017/8

Y1 - 2017/8

N2 - For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux.

AB - For simulation of plasma-facing component erosion in fusion experiments, an analytical expression for the ion velocity just before the surface impact including the local electric field and an optional surface biasing effect is suggested. Energy and angular impact distributions and the resulting effective sputtering yields were produced for several experimental scenarios at JET ILW mostly involving PFCs exposed to an oblique magnetic field. The analytic solution has been applied as an improvement to earlier ERO modelling of localized, Be outer limiter, RF-enhanced erosion, modulated by toggling of a remote, however magnetically connected ICRH antenna. The effective W sputtering yields due to D and Be ion impact in Type-I and Type-III ELMs and inter-ELM conditions were also estimated using the analytical approach and benchmarked by spectroscopy. The intra-ELM W sputtering flux increases almost 10 times in comparison to the inter-ELM flux.

KW - Beryllium

KW - ELM

KW - Electric field

KW - Erosion

KW - ITER-like wall

KW - JET

KW - Oblique magnetic field

KW - Plasma-surface interaction

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U2 - 10.1016/j.nme.2017.03.031

DO - 10.1016/j.nme.2017.03.031

M3 - Article

AN - SCOPUS:85017349283

SN - 2352-1791

VL - 12

SP - 341

EP - 345

JO - Nuclear Materials and Energy

JF - Nuclear Materials and Energy

ER -

An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW

Abstract

Funding

Keywords

UN SDGs

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