This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1016/S0022-3115(02)01333-8 in citations.
Arcing at B4C-covered limiters exposed to a SOL-plasma
Arcing at B4C-covered limiters exposed to a SOL-plasma
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 im...
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Personal Name(s): | Laux, M. |
---|---|
Schneider, W. / Wienhold, P. / Jüttner, H. P. / Huber, A. / Balden, M. / Linke, J. / Kostial, H. / Mayer, M. / Rubel, M. / Herrmann, A. / Pospieszczyk, A. / Jachmich, S. / Schweer, B. / Hildebrandt, D. / Rossignol, P. J. / Bolt, H. | |
Contributing Institute: |
Institut für Plasmaphysik; IPP |
Published in: | Journal of nuclear materials, 313-316 (2003) S. 62 - 66 |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2003
|
Physical Description: |
62 - 66 |
DOI: |
10.1016/S0022-3115(02)01333-8 |
Document Type: |
Journal Article |
Research Program: |
Kernfusion und Plasmaforschung |
Series Title: |
Journal of Nuclear Materials
313-316 |
Subject (ZB): | |
Publikationsportal JuSER |
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. (C) 2003 Elsevier Science B.V. All rights reserved. |