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Performance and erosion of a tungsten brush limiter exposed at the TEXTOR tokamak
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2003 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 313, 67-71 p.Article in journal (Refereed) Published
Abstract [en]

To examine the performance of a castellated structure under plasma loading, a hemispherical solid tungsten brush limiter was exposed to the plasma in the TEXTOR-94 tokamak. Due to the thermally isolated column of W segments, IR camera showed a non-uniform temperature distribution. The maximum incident power density was calculated to be about 35-40 MW/m(2). Concerning impurity generation, the structure did not show any particular effects. During plasma exposure, only some minor cracks developed in one of the columns, however, the crack propagation was interrupted by a groove. It can be concluded that the W brush limiter had comparable performance and superior mechanical behaviour compared to a solid W limiter. To study erosion and long-range transport of W atoms, a graphite limiter was exposed simultaneously with the brush limiter. As a result, the deposited W atoms via long-range transportation were estimated to be 10(15) cm(-2) shot(-1) at 46.5 cm from the plasma centre of TEXTOR.

Place, publisher, year, edition, pages
2003. Vol. 313, 67-71 p.
Keyword [en]
tungsten, castellation, tokamak, TEXTOR, finite element method, erosion deposition
URN: urn:nbn:se:kth:diva-22407DOI: 10.1016/S0022-3115(02)01334-XISI: 000182146700010OAI: diva2:341105
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Rubel, Marek J.
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Alfvén Laboratory
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