Oscillatory vapour shielding of liquid metal walls in nuclear fusion devices

TitleOscillatory vapour shielding of liquid metal walls in nuclear fusion devices
Publication TypeJournal Article
Year of Publication2017
AuthorsG.G van Eden, V. Kvon, M.CM van de Sanden, T.W Morgan
JournalNature Communications
Volume8
Pagination192
Date Published08/2017
Abstract

Providing an efficacious plasma facing surface between the extreme plasma heat exhaust and the structural materials of nuclear fusion devices is a major challenge on the road to electricity production by fusion power plants. The performance of solid plasma facing surfaces may become critically reduced over time due to progressing damage accumulation. Liquid metals, however, are now gaining interest in solving the challenge of extreme heat flux hitting the reactor walls. A key advantage of liquid metals is the use of vapour shielding to reduce the plasma exhaust. Here we demonstrate that this phenomenon is oscillatory by nature. The dynamics of a Sn vapour cloud are investigated by exposing liquid Sn targets to H and He plasmas at heat fluxes greater than 5 MW m−2. The observations indicate the presence of a dynamic equilibrium between the plasma and liquid target ruled by recombinatory processes in the plasma, leading to an approximately stable surface temperature.

DOI10.1038/s41467-017-00288-y
Division

PSI

Department

PMI

PID

1e2cf6044a6f47c20361bf3a9375d6e0

Alternate TitleNat. Comm.
LabelOA

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