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  B4C-limiter experiments at TEXTOR

Pospieszczyk, A., Schweer, B., Philipps, V., Huber, A., Sergienko, G., Samm, U., et al. (2003). B4C-limiter experiments at TEXTOR. Journal of Nuclear Materials, 313-316, 223-229. doi:10.1016/S0022-3115(02)01577-5.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-2349-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-FE90-4
Genre: Journal Article

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 Creators:
Pospieszczyk, A.1, Author
Schweer, B.1, Author
Philipps, V.1, Author
Huber, A.1, Author
Sergienko, G.1, Author
Samm, U.1, Author
Reimer, H.2, Author              
Freisinger, M.1, Author
Rubel, M.1, Author
Hermann, A.3, Author              
Kötterl, S.4, Author              
Laux, M.5, Author              
Renner, H.6, Author              
Bolt, H.4, Author              
Affiliations:
1Institut für Plasmaphysik, Forschungszentrum Jülich GmbH, EURATOM-KFA Association, Trilateral Euregio Cluster, D-52425, Jülich, Germany; Institute for High Temperatures of the RAS, Association IVTAN, 127412, Moscow, Russia; Alfven Laboratory, Royal Institute of Technology, Association EURATOM-VR, 10405, Stockholm, Sweden, ou_persistent22              
2W7-X: Assembly (AS), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856312              
3Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
4Material Research (MF), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856328              
5W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              
6W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856314              

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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 Abstract: In the TEXTOR tokamak the five top and five bottom poloidal carbon limiter blocks have been replaced by inertially cooled copper blocks coated with a 170 μm VPS-B4C layer. Similar limiter blocks have been inserted through lock systems, extensively diagnosed in situ as well as ex situ. During the thermal load by the plasma, the surface temperature rose and decayed extremely fast which can be explained by a different thermal conductivity and heat capacity of the coating. For heat loads below 8 MW m-2 no severe cracking or delamination of the B4C-coating were observed. Due to the insulating behaviour of the layer, distinct craters developed on both limiter types, which reached down to the copper surface and are assumed to be caused by electrical arcs. An oscillation of the evolution of the surface temperature has been observed under certain conditions, which is clearly correlated to the use of the coated test limiter. Particle fluxes as well as hydrogen inventory turned out to be very similar to those from a low-Z surface in a carbon surrounding. No significant impact of the plasma on the coating and vice versa was observed.

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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: 223 - 229 Identifier: -