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  Arcing at B4C-covered limiters exposed to a SOL-plasma

Laux, M., Schneider, W., Wienhold, P., Jüttner, B., Huber, A., Balden, M., et al. (2003). Arcing at B4C-covered limiters exposed to a SOL-plasma. Journal of Nuclear Materials, 313-316, 62-66. doi:10.1016/S0022-3115(02)01333-8.

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 Creators:
Laux, M.1, Author           
Schneider, W.2, Author           
Wienhold, P.3, Author           
Jüttner, B.3, Author           
Huber, A.4, Author
Balden, M.5, Author           
Linke, J.4, Author
Kostial, H.4, Author
Mayer, M.5, Author           
Rubel, M.4, Author
Herrmann, A.6, Author           
Pospieszczyk, A.4, Author
Jachmich, S.4, Author
Schweer, B.4, Author
Hildebrandt, D.3, Author           
Bolt, H.5, Author           
Affiliations:
1W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
2Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856309              
3Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
4Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM Assoc., Trilateral Euregio Cluster, 52425, Jülich, Germany; Institut für Physik, Humboldt-Universität zu Berlin, 10115, Berlin, Germany; Paul-Drude-Institut für Festkörperelektronik, 10117, Berlin, Germany; Alfven Laboratory, Royal Institute of Technology, 10405, Stockholm, Sweden, ou_persistent22              
5Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856328              
6Experimental Plasma Physics 1 (E1), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856295              

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Free keywords: 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
 Abstract: 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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Journal of Nuclear Materials
  Alternative Title : J. Nucl. Mater.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier Science B.V. All rights reserved
Pages: - Volume / Issue: 313-316 Sequence Number: - Start / End Page: 62 - 66 Identifier: -