Design and Test of Wendelstein 7-X Water-Cooled Divertor Scraper

J. Boscary; H. Greuner; G. Ehrke; B. Boswirth; Z. Wang; E. Clark; A. Lumsdaine; J. Tretter; P. Junghanns; R. Stadler; D. McGinnis; J. Lore

doi:10.1109/TPS.2018.2804660

Design and Test of Wendelstein 7-X Water-Cooled Divertor Scraper

J. Boscary, H. Greuner, G. Ehrke, B. Boswirth, Z. Wang, E. Clark, A. Lumsdaine, J. Tretter, P. Junghanns, R. Stadler, D. McGinnis, J. Lore

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

1 Scopus citations

Abstract

Heat load calculations have indicated the possible overloading of the ends of the water-cooled divertor facing the pumping gap beyond their technological limit. The intention of the scraper is the interception of some of the plasma fluxes both upstream and downstream before they reach the divertor surface. The scraper is divided into six modules of four plasma facing components (PFCs); each module has four PFCs hydraulically connected in series by two water boxes (inlet and outlet). A full-scale prototype of one module has been manufactured. Development activities have been carried out to connect the water boxes to the cooling pipes of the PFCs by tungsten inert gas internal orbital welding. This prototype was successfully tested in the GLADIS facility with 17 MW/m² for 500 cycles. The results of these activities have confirmed the possible technological basis for a fabrication of the water-cooled scraper.

Original language	English
Pages (from-to)	1398-1401
Number of pages	4
Journal	IEEE Transactions on Plasma Science
Volume	46
Issue number	5
DOIs	https://doi.org/10.1109/TPS.2018.2804660
State	Published - May 2018

Funding

Manuscript received June 23, 2017; revised January 3, 2018; accepted January 30, 2018. Date of current version May 8, 2018. This work was supported in part by the Federal Ministry of Education and Research of the Federal Republic of Germany under Grant 03FUS0014A and in part by UT-Battelle, LLC with the U.S. Department of Energy under Contract DE-AC05-00OR22725. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this paper, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/ doe-public-access-plan). The review of this paper was arranged by Senior Editor E. Surrey. (Corresponding author: J. Boscary.) J. Boscary, H. Greuner, B. Böswirth, Z. Wang, J. Tretter, P. Junghanns, and R. Stadler are with the Max Planck Institute for Plasma Physics, 85748 Garching, Germany (e-mail: [email protected]).

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
UT-Battelle
Bundesministerium für Bildung und Forschung	03FUS0014A

Keywords

Divertor
Wendelstein 7-X
plasma facing component (PFC)
scraper
stellarator

UN SDGs

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

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10.1109/TPS.2018.2804660

Cite this

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abstract = "Heat load calculations have indicated the possible overloading of the ends of the water-cooled divertor facing the pumping gap beyond their technological limit. The intention of the scraper is the interception of some of the plasma fluxes both upstream and downstream before they reach the divertor surface. The scraper is divided into six modules of four plasma facing components (PFCs); each module has four PFCs hydraulically connected in series by two water boxes (inlet and outlet). A full-scale prototype of one module has been manufactured. Development activities have been carried out to connect the water boxes to the cooling pipes of the PFCs by tungsten inert gas internal orbital welding. This prototype was successfully tested in the GLADIS facility with 17 MW/m2 for 500 cycles. The results of these activities have confirmed the possible technological basis for a fabrication of the water-cooled scraper.",

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AU - Clark, E.

AU - Lumsdaine, A.

AU - Tretter, J.

AU - Junghanns, P.

AU - Stadler, R.

AU - McGinnis, D.

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Design and Test of Wendelstein 7-X Water-Cooled Divertor Scraper

Abstract

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Keywords

UN SDGs

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