Journal Article

FZJ-2020-00787

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Erosion and deposition investigations on Wendelstein 7-X first wall components for the first operation phase in divertor configuration

Dhard, C. P. (Corresponding author) ; Mayer, M. ; Brezinsek, S.FZJ* ; Masuzaki, S. ; Motojima, G. ; König, R.FZJ* ; Pedersen, T. S. ; Neu, R. ; Hathiramani, D. ; Krause, M. ; Ehrke, G. ; Ruset, C. ; Schwarz-Selinger, T. ; Balden, M. ; Burwitz, V. V. ; Coenen, J. W.FZJ* ; Linsmeier, C.FZJ* ; Naujoks, D. ; Neubauer, O.FZJ* ; Rack, M. ; Tokitani, M. ; Oelmann, J.FZJ* ; Li, C. ; Rasinski, M.FZJ* ; Höschen, D.FZJ* ; Yajima, M.

2019
Elsevier New York, NY [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/24149  doi:10.1016/j.fusengdes.2018.12.031

Abstract: In the stellarator Wendelstein 7-X with its twisted 3D magnetic field geometry, studies of material migration with respect to first wall components become very important in view of the envisioned long-pulse operation. A variety of erosion/deposition samples were installed on the plasma-facing components exposed at three different nominal heat load levels between 0.1 and 10 MW/m2. After the first successful operation phase in divertor configuration, all the probes at higher and lower load levels were removed, whereas at the intermediate load levels, 352 out of 30 000 screws have been exchanged at selected locations along the toroidal and poloidal directions. The exchanged probes have been analyzed by various measurement techniques. At the higher load levels where the probes were installed within the divertor, heavy erosion has been observed presumably at the strike line positions. Both, erosion and deposition phenomena have been found on the screw heads. The optical reflection measurement profile of the whole plasma vessel show the deposition patterns at similar locations in all the five modules. At the low load level, the Si-wafer probes are under investigation.

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Contributing Institute(s):

1. Plasmaphysik (IEK-4)

Research Program(s):

1. 174 - Plasma-Wall-Interaction (POF3-174) (POF3-174)

Appears in the scientific report 2019

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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