An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW
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 effe...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2017-08-01
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| Series: | Nuclear Materials and Energy |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352179116301958 |
| _version_ | 1830483964085665792 |
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| author | I. Borodkina D. Borodin S. Brezinsek A. Kirschner I.V. Tsvetkov V.A. Kurnaev V. Bobkov C.C. Klepper A. Lasa C. Guillemaut P. Jacquet M.F. Stamp C. Giroud S. Silburn I. Balboa E. Solano |
| author_facet | I. Borodkina D. Borodin S. Brezinsek A. Kirschner I.V. Tsvetkov V.A. Kurnaev V. Bobkov C.C. Klepper A. Lasa C. Guillemaut P. Jacquet M.F. Stamp C. Giroud S. Silburn I. Balboa E. Solano |
| author_sort | I. Borodkina |
| collection | DOAJ |
| description | 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: Plasma-surface interaction, JET, ITER-like wall, Beryllium, Erosion, Oblique magnetic field, Electric field, ELM |
| first_indexed | 2024-12-21T18:00:25Z |
| format | Article |
| id | doaj.art-97e3823553304227825faba5cf82833e |
| institution | Directory Open Access Journal |
| issn | 2352-1791 |
| language | English |
| last_indexed | 2024-12-21T18:00:25Z |
| publishDate | 2017-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Nuclear Materials and Energy |
| spelling | doaj.art-97e3823553304227825faba5cf82833e2022-12-21T18:55:04ZengElsevierNuclear Materials and Energy2352-17912017-08-0112341345An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILWI. Borodkina0D. Borodin1S. Brezinsek2A. Kirschner3I.V. Tsvetkov4V.A. Kurnaev5V. Bobkov6C.C. Klepper7A. Lasa8C. Guillemaut9P. Jacquet10M.F. Stamp11C. Giroud12S. Silburn13I. Balboa14E. Solano15National Research Nuclear University Mephl, Kashirskoe sh., 31, Moscow, Russia; Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany; Corresponding author.Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, GermanyForschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, GermanyForschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, GermanyNational Research Nuclear University Mephl, Kashirskoe sh., 31, Moscow, RussiaNational Research Nuclear University Mephl, Kashirskoe sh., 31, Moscow, RussiaMax-Planck-Institut for Plasmaphysik, EURATOM-Assoziation, Garching, GermanyOak Ridge National Laboratory, Oak Ridge, TN 37831-6169, USAOak Ridge National Laboratory, Oak Ridge, TN 37831-6169, USAInstituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade Lisboa, Portugal; CCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomCCFE, Culham Science Centre, Abingdon OX14 3DB, United KingdomLaboratorio Nacional de Fusion, CIEMAT, 28040 Madrid, SpainFor 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: Plasma-surface interaction, JET, ITER-like wall, Beryllium, Erosion, Oblique magnetic field, Electric field, ELMhttp://www.sciencedirect.com/science/article/pii/S2352179116301958 |
| spellingShingle | I. Borodkina D. Borodin S. Brezinsek A. Kirschner I.V. Tsvetkov V.A. Kurnaev V. Bobkov C.C. Klepper A. Lasa C. Guillemaut P. Jacquet M.F. Stamp C. Giroud S. Silburn I. Balboa E. Solano An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW Nuclear Materials and Energy |
| title | An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW |
| title_full | An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW |
| title_fullStr | An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW |
| title_full_unstemmed | An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW |
| title_short | An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW |
| title_sort | analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at jet ilw |
| url | http://www.sciencedirect.com/science/article/pii/S2352179116301958 |
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