Estimation of ELM effects on Be and W erosion at JET-ILW

0531215 - ÚFP 2021 RIV GB eng J - Journal Article
Borodkina, Irina - Borodin, D. - Brezinsek, S. - Kurnaev, V.A. - Huber, A. - Sergienko, G.
Estimation of ELM effects on Be and W erosion at JET-ILW.
Physica Scripta. Roč. 2020, T171 (2020), č. článku 014027. ISSN 0031-8949. E-ISSN 1402-4896.
[17th International Conference on Plasma-Facing Materials and Components for Fusion Applications. Eindhoven, 20.05.2019-24.05.2019]
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
Keywords : Beryllium * Elm * Erosion * ITER-like wall * Jet * Pedestal
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 2.487, year: 2020
Method of publishing: Limited access
https://iopscience.iop.org/article/10.1088/1402-4896/ab45c0

An important W erosion mechanism in JET divertor is the physical sputtering by both, impurity (e.g. Be) and hydrogenic ions hitting the W divertor with energies determined by the pedestal temperature during edge-localized modes (ELMs) the so-called intra-ELM sputtering of W. The earlier developed analytical approach for the W divertor gross erosion estimation using the Langmuir probe measurements has been improved in this work taking into account the time-resolved pedestal temperature and density drop during the pedestal crash under intra-ELM conditions. The improved model allows reproducing the measured at the divertor tile particle and heat fluxes evolution at the effective magnetic connection length matched with the previous JET- ITER like wall (ILW) studies. The estimates for the tungsten sputtered flux in intra- and inter-ELM conditions for quasi-steady state plasmas executed at the end of the first year of JET-ILW operation (C30C experiment) show that Type I ELMs contribute significantly (∼85%) to the gross tungsten erosion which is in a good agreement with the divertor optical emission spectroscopy (W I 400.9 nm line). ELM filament radial propagation is considered based on the advective-diffusive model and JET-C experiment results. The estimation for the ELM-induced local Be main chamber erosion at JET-ILW reveals the increase of the Be sputtered flux by 30% under intra-ELM conditions.
Permanent Link: http://hdl.handle.net/11104/0309928