Home > Publications database > First divertor physics studies in Wendelstein 7-X > print

001     864231
005     20240711113849.0
024 7 _ |a 10.1088/1741-4326/ab280f
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024 7 _ |a 0029-5515
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024 7 _ |a 1741-4326
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024 7 _ |a 2128/23407
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037 _ _ |a FZJ-2019-04065
082 _ _ |a 620
100 1 _ |a Sunn Pedersen, T.
|0 0000-0002-9720-1276
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|e Corresponding author
245 _ _ |a First divertor physics studies in Wendelstein 7-X
260 _ _ |a Vienna
|c 2019
|b IAEA
336 7 _ |a article
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336 7 _ |a ARTICLE
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520 _ _ |a The Wendelstein 7-X (W7-X) optimized stellarator fusion experiment, which went into operation in 2015, has been operating since 2017 with an un-cooled modular graphite divertor. This allowed first divertor physics studies to be performed at pulse energies up to 80 MJ, as opposed to 4 MJ in the first operation phase, where five inboard limiters were installed instead of a divertor. This, and a number of other upgrades to the device capabilities, allowed extension into regimes of higher plasma density, heating power, and performance overall, e.g. setting a new stellarator world record triple product. The paper focuses on the first physics studies of how the island divertor works. The plasma heat loads arrive to a very high degree on the divertor plates, with only minor heat loads seen on other components, in particular baffle structures built in to aid neutral compression. The strike line shapes and locations change significantly from one magnetic configuration to another, in very much the same way that codes had predicted they would. Strike-line widths are as large as 10 cm, and the wetted areas also large, up to about 1.5 m2, which bodes well for future operation phases. Peak local heat loads onto the divertor were in general benign and project below the 10 MW m−2 limit of the future water-cooled divertor when operated with 10 MW of heating power, with the exception of low-density attached operation in the high-iota configuration. The most notable result was the complete (in all 10 divertor units) heat-flux detachment obtained at high-density operation in hydrogen.
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700 1 _ |a Krychowiak, M.
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700 1 _ |a Gradic, D.
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700 1 _ |a Killer, C.
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700 1 _ |a Niemann, H.
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700 1 _ |a Szepesi, T.
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700 1 _ |a Wenzel, U.
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700 1 _ |a Baldzuhn, J.
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700 1 _ |a Barbui, T.
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700 1 _ |a Biedermann, C.
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700 1 _ |a Blackwell, B. D.
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700 1 _ |a Bosch, H.-S.
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700 1 _ |a Bozhenkov, S.
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700 1 _ |a Brakel, R.
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700 1 _ |a Brezinsek, S.
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700 1 _ |a Cai, J.
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700 1 _ |a Cannas, B.
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700 1 _ |a Coenen, J. W.
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700 1 _ |a Endler, M.
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700 1 _ |a Feng, Y.
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700 1 _ |a Fellinger, J.
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700 1 _ |a Ford, O.
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700 1 _ |a Frerichs, H.
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700 1 _ |a Gao, Y.
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700 1 _ |a Geiger, J.
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700 1 _ |a Goriaev, A.
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700 1 _ |a Hammond, K.
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700 1 _ |a Harris, J.
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700 1 _ |a Hathiramani, D.
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700 1 _ |a Henkel, M.
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700 1 _ |a Kazakov, Ye. O.
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700 1 _ |a Kirschner, Andreas
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700 1 _ |a Knieps, A.
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700 1 _ |a Kobayashi, M.
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700 1 _ |a Kocsis, G.
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700 1 _ |a Kornejew, P.
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700 1 _ |a Kremeyer, T.
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700 1 _ |a Lazerzon, S.
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700 1 _ |a LeViness, A.
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700 1 _ |a Li, C.
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700 1 _ |a Li, Y.
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700 1 _ |a Liang, Y.
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700 1 _ |a Liu, Shaocheng
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700 1 _ |a Lore, J.
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700 1 _ |a Masuzaki, S.
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700 1 _ |a Moncada, V.
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700 1 _ |a Neubauer, O.
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700 1 _ |a Ngo, T. T.
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700 1 _ |a Oelmann, J.
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700 1 _ |a Otte, M.
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700 1 _ |a Perseo, V.
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700 1 _ |a Pisano, F.
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700 1 _ |a Puig Sitjes, A.
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700 1 _ |a Rack, M.
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700 1 _ |a Romazanov, J.
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700 1 _ |a Schlisio, G.
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700 1 _ |a Schmitt, J. C.
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700 1 _ |a Schmitz, O.
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700 1 _ |a Schweer, B.
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700 1 _ |a Sereda, S.
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700 1 _ |a Sleczka, M.
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700 1 _ |a Suzuki, Y.
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700 1 _ |a Vecsei, M.
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700 1 _ |a Wang, E.
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700 1 _ |a Wiesen, S.
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700 1 _ |a Winters, V.
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700 1 _ |a Wurden, G. A.
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773 _ _ |a 10.1088/1741-4326/ab280f
|g Vol. 59, no. 9, p. 096014 -
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|t Nuclear fusion
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856 4 _ |u https://juser.fz-juelich.de/record/864231/files/Sunn_Pedersen_2019_Nucl._Fusion_59_096014.pdf
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856 4 _ |y Published on 2019-07-22. Available in OpenAccess from 2020-07-22.
|u https://juser.fz-juelich.de/record/864231/files/Pedersen_paper_IAEA_NF2019v11.pdf
856 4 _ |y Published on 2019-07-22. Available in OpenAccess from 2020-07-22.
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