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. (C) 2017 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

An analytical expression for ion velocities at the wall including the sheath electric field and surface biasing for erosion modeling at JET ILW / Borodkina, I.; Borodin, D.; Brezinsek, S.; Kirschner, A.; Tsvetkov, I. V.; Kurnaev, V. A.; Bobkov, V.; Klepper, C. C.; Lasa, A.; Guillemaut, C.; Jacquet, P.; Stamp, M. F.; Giroud, C.; Silburn, S.; Balboa, I.; Solano, E.; Subba, F.. - In: NUCLEAR MATERIALS AND ENERGY. - ISSN 2352-1791. - 12:(2017), pp. 341-345. [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

Subba, F.
2017

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. (C) 2017 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.
File in questo prodotto:
File Dimensione Formato  
WPPFCCP16_14720_submitted.pdf

accesso aperto

Tipologia: 1. Preprint / submitted version [pre- review]
Licenza: PUBBLICO - Tutti i diritti riservati
Dimensione 612.22 kB
Formato Adobe PDF
612.22 kB Adobe PDF Visualizza/Apri
1-s2.0-S2352179116301958-main.pdf

accesso aperto

Tipologia: 2a Post-print versione editoriale / Version of Record
Licenza: Creative commons
Dimensione 988.62 kB
Formato Adobe PDF
988.62 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2986917