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Application of tung...
Application of tungsten for plasma limiters in TEXTOR
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Tanabe, T. (författare)
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Wada, M. (författare)
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Ohgo, T. (författare)
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visa fler...
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Philipps, V. (författare)
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- Rubel, Marek J. (författare)
- KTH,Alfvénlaboratoriet
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Huber, A. (författare)
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von Seggern, J. (författare)
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Ohya, K. (författare)
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Pospieszczyk, A. (författare)
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Schweer, B. (författare)
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(creator_code:org_t)
- 2000
- 2000
- Engelska.
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Ingår i: Journal of Nuclear Materials. - 0022-3115 .- 1873-4820. ; 283, s. 1128-1133
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
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- Three different types of W limiters were exposed in the TEXTOR plasma and the response of the plasma and materials performance of the limiters were investigated. 1. A W bulk limiter operated with preheating above 800 K withstood a plasma heat load of about similar to 20 MW/m(2) for a few seconds with some slight surface melting during the highest heat load shot. However, it was severely damaged when operated at around 500 K. 2. A C/W twin test limiter, half made of bulk W and the other half of graphite (EK-98) gave very useful information on how low- and high-Z materials behave under conditions of simultaneous utilization as PFM such as cross-contamination and the influence of a large mass difference on hydrogen reflection and deposition. 3. Two sets of main poloidal W limiters made of vacuum vapor sprayed (VPS)-W deposited on graphite (IG-430U) with a Re interlayer could absorb about 60% of the total convection heat and the ohmic plasma with a density as high as 5 x 10(13) cm(-3) was sustained. Most of the VPS-W coated limiters tolerated a heal load of similar to 20 MW/m(2). This series of W limiters experiments in TEXTOR has shown that W is applicable as a PFM, if its central accumulation is avoided by NBI and/or ICRH heating. Nevertheless, some concerns still remain, including difficulty of plasma startup, W behavior in higher temperature plasmas, and materials' selection.
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Tanabe, T.
-
Wada, M.
-
Ohgo, T.
-
Philipps, V.
-
Rubel, Marek J.
-
Huber, A.
-
visa fler...
-
von Seggern, J.
-
Ohya, K.
-
Pospieszczyk, A.
-
Schweer, B.
-
visa färre...
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Journal of Nucle ...
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