Design and analysis of the W7-X divertor scraper element

A. Lumsdaine; J. Tipton; J. Lore; D. McGinnis; J. Canik; J. Harris; A. Peacock; J. Boscary; J. Tretter; T. Andreeva

doi:10.1016/j.fusengdes.2013.05.075

Design and analysis of the W7-X divertor scraper element

A. Lumsdaine, J. Tipton, J. Lore, D. McGinnis, J. Canik, J. Harris, A. Peacock, J. Boscary, J. Tretter, T. Andreeva

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

Thehigh heat-flux divertor of the Wendelstein 7-X large stellarator experiment consists of 10 divertor units which are designed to carry a steady-state heat flux of 10 MW/m². However, the edge elements of this divertor are limited to only 5 MW/m², and may be overloaded in certain plasma scenarios. It is proposed to reduce this heat by placing an additional "scraper element" in each of the ten divertor locations. It will be constructed using carbon fiber composite (CFC) monoblock technology. The design of the monoblocks and the path of the cooling tubes must be optimized in order to survive the significant steady-state heat loads, provide adequate coverage for the existing divertor, be located within sub-millimeter accuracy, and take into account the boundaries to other in vessel components, all at a minimum cost. Computational fluid dynamics modeling has been performed to examine the thermal transfer through the monoblock swirl tube channels for the design of the monoblock orientation. An iterative physics modeling and computer aided design process is being performed to optimize the placement of the scraper element within the severe spatial restrictions.

Original language	English
Pages (from-to)	1773-1777
Number of pages	5
Journal	Fusion Engineering and Design
Volume	88
Issue number	9-10
DOIs	https://doi.org/10.1016/j.fusengdes.2013.05.075
State	Published - Oct 2013

Funding

This work is supported in part by US DOE Contract Number DE-AC05-00OR22725 .

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725

Keywords

Computational fluid dynamics
Divertor
High heat flux
Plasma facing components
Stellarator

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.fusengdes.2013.05.075

Cite this

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abstract = "Thehigh heat-flux divertor of the Wendelstein 7-X large stellarator experiment consists of 10 divertor units which are designed to carry a steady-state heat flux of 10 MW/m2. However, the edge elements of this divertor are limited to only 5 MW/m2, and may be overloaded in certain plasma scenarios. It is proposed to reduce this heat by placing an additional {"}scraper element{"} in each of the ten divertor locations. It will be constructed using carbon fiber composite (CFC) monoblock technology. The design of the monoblocks and the path of the cooling tubes must be optimized in order to survive the significant steady-state heat loads, provide adequate coverage for the existing divertor, be located within sub-millimeter accuracy, and take into account the boundaries to other in vessel components, all at a minimum cost. Computational fluid dynamics modeling has been performed to examine the thermal transfer through the monoblock swirl tube channels for the design of the monoblock orientation. An iterative physics modeling and computer aided design process is being performed to optimize the placement of the scraper element within the severe spatial restrictions.",

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author = "A. Lumsdaine and J. Tipton and J. Lore and D. McGinnis and J. Canik and J. Harris and A. Peacock and J. Boscary and J. Tretter and T. Andreeva",

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AU - Tipton, J.

AU - Lore, J.

AU - McGinnis, D.

AU - Canik, J.

AU - Harris, J.

AU - Peacock, A.

AU - Boscary, J.

AU - Tretter, J.

AU - Andreeva, T.

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N2 - Thehigh heat-flux divertor of the Wendelstein 7-X large stellarator experiment consists of 10 divertor units which are designed to carry a steady-state heat flux of 10 MW/m2. However, the edge elements of this divertor are limited to only 5 MW/m2, and may be overloaded in certain plasma scenarios. It is proposed to reduce this heat by placing an additional "scraper element" in each of the ten divertor locations. It will be constructed using carbon fiber composite (CFC) monoblock technology. The design of the monoblocks and the path of the cooling tubes must be optimized in order to survive the significant steady-state heat loads, provide adequate coverage for the existing divertor, be located within sub-millimeter accuracy, and take into account the boundaries to other in vessel components, all at a minimum cost. Computational fluid dynamics modeling has been performed to examine the thermal transfer through the monoblock swirl tube channels for the design of the monoblock orientation. An iterative physics modeling and computer aided design process is being performed to optimize the placement of the scraper element within the severe spatial restrictions.

AB - Thehigh heat-flux divertor of the Wendelstein 7-X large stellarator experiment consists of 10 divertor units which are designed to carry a steady-state heat flux of 10 MW/m2. However, the edge elements of this divertor are limited to only 5 MW/m2, and may be overloaded in certain plasma scenarios. It is proposed to reduce this heat by placing an additional "scraper element" in each of the ten divertor locations. It will be constructed using carbon fiber composite (CFC) monoblock technology. The design of the monoblocks and the path of the cooling tubes must be optimized in order to survive the significant steady-state heat loads, provide adequate coverage for the existing divertor, be located within sub-millimeter accuracy, and take into account the boundaries to other in vessel components, all at a minimum cost. Computational fluid dynamics modeling has been performed to examine the thermal transfer through the monoblock swirl tube channels for the design of the monoblock orientation. An iterative physics modeling and computer aided design process is being performed to optimize the placement of the scraper element within the severe spatial restrictions.

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KW - Plasma facing components

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Design and analysis of the W7-X divertor scraper element

Abstract

Funding

Keywords

UN SDGs

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