Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session BP11: Poster Session I: HEDP; General Stellarator; Wendelstein 7-X; Heating, Current Drive, and Energetic Ions (9:30am-12:30pm)
Monday, November 5, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.BP11.70
Abstract: BP11.00070 : Light impurity exhaust with the Wendelstein 7-X island divertor*
Presenter:
Thierry Kremeyer
(Univ of Wisconsin, Madison)
Authors:
Thierry Kremeyer
(Univ of Wisconsin, Madison)
Florian Effenberg
(Univ of Wisconsin, Madison)
Jeffrey H Harris
(Oak Ridge National Lab)
Marcin Jakuboski
(Max-Planck Institut für Plasmaphysik, Greifswald)
Ralf König
(Max-Planck Institut für Plasmaphysik, Greifswald)
Petra Kornejew
(Max-Planck Institut für Plasmaphysik, Greifswald)
Maciej Krychowiak
(Max-Planck Institut für Plasmaphysik, Greifswald)
Oliver Schmitz
(Univ of Wisconsin, Madison)
Victoria R Winters
(Univ of Wisconsin, Madison)
the W7-X team
(Max-Planck Institut für Plasmaphysik, Greifswald)
Preventing impurity accumulation in improved energy confinement regimes to maintain stationary plasma conditions is of great importance in fusion research. This is important for helium, the ash of the fusion process as well for impurities used for radiative edge cooling. A set of ORNL Filterscopes [1] was used to observe line integrated intensities of the impurity lines while a set of WISP gauges [2] was used to monitor the partial neutral pressure in the divertor pump gap of the island divertor at W7-X. The results from experiments utilizing short injections of moderate flux densities of He, N and Ne will be discussed. The response of these injections in the line-averaged density and in the partial neutral pressure in the pump gaps will be discussed. In particular the effective confinement time τp* will be analysed for hydrogen as well as for He.
References
[1] Colchin, R J et al, Rev. Sci. Instrum. 74 (2003)
[2] Flesch, K et al, Rev. Sci. Instrum. 87 (2016)
*This work was funded by U.S. DoE grant DE-SC00014210
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.BP11.70
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