Intra-ELM tungsten sputtering in JET ITERlike wall: Analytical studies of Be impurity and ELM type influence

JET Contributors

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4 Scopus citations

Abstract

The W source strength in JET H-mode discharges depends on the W sputtering in the inter and the intra-ELM phase due to impinging hydrogenic ions (D or H) and impurities (mainly Be). The analytical approach for interpretation of the Langmuir probe measurements is applied to model the ELM ion parallel transport and the W sputtering flux in intra-ELM and inter-ELM conditions in JET-ITER-like wall (ILW) hydrogen and deuterium plasmas. The impact of the Be ion charge and the Be concentration in the impinging ion flux on the W sputtering was estimated. Be2+ concentrations of 0.5% and 1% in the impinging ion flux increases the W sputtering fluence per ELM by 20%-30% and 35%-55% correspondingly with respect to pure deuterium plasma; the charge state of Be ions has no substantial effect on W sputtering in the intra-ELM phase. The analysis of JET ELMy H-mode discharges in hydrogen with different types of ELMs is presented. The W sputtering source under inter- and intra-ELM conditions is estimated using the analytical approach and validated by optical emission spectroscopy in these discharges. The intra-ELM W sputtering flux increases 2-4 times in comparison to the inter-ELM flux.

Original languageEnglish
Article number014065
JournalPhysica Scripta
Volume2017
Issue numberT170
DOIs
StatePublished - 1 Dec 2017
Externally publishedYes
Event16th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2017 - Neuss/Dusseldorf, Germany
Duration: 16 May 201719 May 2017

Bibliographical note

Publisher Copyright:
© 2017 Forschungszentrum Jülich.

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014–2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been initiated within the FZJ—MEPhI strategic partnership. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2014-2018 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work has been initiated within the FZJ-MEPhI strategic partnership.

FundersFunder number
Euratom research and training program 2014-2018
Horizon 2020 Framework Programme
H2020 Euratom633053

    Keywords

    • ELM
    • JET ITER-like wall
    • Langmuir probe
    • Physical sputtering
    • Spectroscopy
    • Tungsten

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