Scanning electron microscopy analyses of an ITER plasma-facing unit mockup exposed to extreme ion fluences in Magnum-PSI

TitleScanning electron microscopy analyses of an ITER plasma-facing unit mockup exposed to extreme ion fluences in Magnum-PSI
Publication TypeJournal Article
Year of Publication2020
AuthorsM. Balden, S. Elgeti, T.W Morgan, S. Brezinsek, G. De Temmerman
JournalPhysica Scripta
Volume95
IssueT171
Pagination014026
Date Published03/2020
Abstract

A small-scale tungsten monoblock mockup was exposed to continuous Magnum-PSI plasma beams under six different conditions, including pure hydrogen, deuterium and helium (He) plasmas as well as mixed D/He plasmas with low electron temperature (1.5–5 eV), with maximum surface temperatures up to 1600 °C, and with ion fluences up to 10 30 m−2. The recrystallization in the centre of the hottest exposure spots, the absence of cracking on all monoblocks, the formation of a nanostructured fuzz layer several microns thick by pure He exposure, and the presence of various impurities from the exposure in Magnum-PSI on the surface were observed and analysed with a dedicated scanning electron microscope able to handle the entire mockup without any prior cutting.

DOI10.1088/1402-4896/ab4479
Division

PSI

Department

PMI

PID

9c76acfe55a642c8413ebaee378021f4

Alternate TitlePhys. Scr.

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