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Arcing at B4C-cover...
Arcing at B4C-covered limiters exposed to a SOL-plasma
- Article/chapterEnglish2003
Publisher, publication year, extent ...
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-22406
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-22406URI
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https://doi.org/10.1016/S0022-3115(02)01333-8DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20100525
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Plasma sprayed B4C-layers considered as wall coatings for the W7X stellarator have been studied during and after exposure to TEXTOR and after arcing experiments in vacuum. Arcing through the B4C layer occurred favoured by high power fluxes and not restricted to less stable phases. But this arcing implies an especially noisy scrape-off layer (SOL). Instead of moving retrograde in the external magnetic field, the arc spot on the B4C-layer sticks to the same location for its whole lifetime. Consequently, the arc erodes the entire B4C layer, finally burning down to the Cu substrate. In the neighbourhood of craters the surface contains Cu originating from those craters. This material, hauled to the surface by the arc, is subject to subsequent erosion, transport, and redeposition by the SOL-plasma. The behaviour of arcs on B4C is Most probably caused by the peculiar temperature dependences of the electrical and heat conductivity of B4C.
Subject headings and genre
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scrape-off layer
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plasma facing materials
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boron carbide
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arcing
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erosion/deposition
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limiter
Added entries (persons, corporate bodies, meetings, titles ...)
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Schneider, W.
(author)
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Wienhold, P.
(author)
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Juttner, B.
(author)
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Huber, A.
(author)
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Balden, M.
(author)
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Linke, J.
(author)
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Kostial, H.
(author)
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Mayer, M.
(author)
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Rubel, Marek J.KTH,Alfvénlaboratoriet(Swepub:kth)u1vrej8y
(author)
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Herrmann, A.
(author)
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Pospieszczyk, A.
(author)
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Jachmich, S.
(author)
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Schweer, B.
(author)
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Hildebrandt, D.
(author)
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Bolt, H.
(author)
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KTHAlfvénlaboratoriet
(creator_code:org_t)
Related titles
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In:Journal of Nuclear Materials313, s. 62-660022-31151873-4820
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- By the author/editor
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Laux, M.
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Schneider, W.
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Wienhold, P.
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Juttner, B.
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Huber, A.
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Balden, M.
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show more...
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Linke, J.
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Kostial, H.
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Mayer, M.
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Rubel, Marek J.
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Herrmann, A.
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Pospieszczyk, A.
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Jachmich, S.
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Schweer, B.
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Hildebrandt, D.
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Bolt, H.
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- Articles in the publication
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Journal of Nucle ...
- By the university
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Royal Institute of Technology