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

I. Borodkina, D. Borodin, S. Brezinsek, V. A. Kurnaev, A. Huber, G. Sergienko

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

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.

Original languageEnglish
Article number014027
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
StatePublished - 1 Jan 2020
Externally publishedYes
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: 20 May 201924 May 2019

Bibliographical note

Publisher Copyright:
© Institute of Plasma Physics Czech Academy of Sciences.

Keywords

  • Beryllium
  • Elm
  • Erosion
  • ITER-like wall
  • Jet
  • Pedestal

Fingerprint

Dive into the research topics of 'Estimation of ELM effects on Be and W erosion at JET-ILW'. Together they form a unique fingerprint.

Cite this