Preliminary test results on tungsten tile with castellation structures in KSTAR

TitlePreliminary test results on tungsten tile with castellation structures in KSTAR
Publication TypeJournal Article
Year of Publication2014
AuthorsS.H Hong, E.N Bang, S.T Lim, J.Y Lee, S.J Yang, A. Litnovsky, M. Hellwig, D. Matveev, M. Komm, M.A van den Berg, T. Lho, C.R Park, G.H Kim
JournalFusion Engineering and Design
Volume89
Issue7-8
Pagination1704–1708
KeywordsCastellation, Plasma–surface interaction, Tungsten
Abstract

A bulk tungsten tile with conventional and shaped castellation structures was exposed to various plasmas in KSTAR during 2012 campaign, in order to verify the functions of the shaped castellation designed for ITER divertor. The thermal response of the tile during the campaign was measured by thermocouples. The tungsten tile was collected after the campaign and the castellation structures were examined. The deposition inside the gap was studied to identify the contributions of ions and charge exchange neutrals. The shaped castellation shows a penetration depth of ions smaller than that of conventional one by a factor of ∼2, thus less deposition inside the gap which is consistent with the prediction made by SPICE2 code. It seems that blister formation and cracking have occurred during plasma shots.

DOI10.1016/j.fusengdes.2014.01.033
Division

PSI

Department

PSI-FI

PID

895e9df64048c1e30d50b2e968b6faac

Alternate TitleFusion Eng. Des.

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