First divertor physics studies in Wendelstein 7-X

Sunn Pedersen, T.; König, R.; Jakubowski, M.; Krychowiak, M.; Gradic, D.; Killer, C.; Niemann, H.; Szepesi, T.; Wenzel, U.; Ali, A.; Anda, G.; Baldzuhn, J.; Barbui, T.; Biedermann, C.; Blackwell, B. D.; Bosch, H. -S.; Bozhenkov, S.; Brakel, R.; Brezinsek, S.; Cai, J.; Cannas, B.; Coenen, J. W.; Cosfeld, J.; Dinklage, A.; Dittmar, T.; Drewelow, P.; Drews, P.; Dunai, D.; Effenberg, F.; Endler, M.; Feng, Y.; Fellinger, J.; Ford, O.; Frerichs, H.; Fuchert, G.; Gao, Y.; Geiger, J.; Goriaev, A.; Hammond, K.; Harris, J.; Hathiramani, D.; Henkel, M.; Kazakov, Ye O.; Kirschner, A.; Knieps, A.; Kobayashi, M.; Kocsis, G.; Kornejew, P.; Kremeyer, T.; Lazerzon, S.; LeViness, A.; Li, C.; Li, Y.; Liang, Y.; Liu, S.; Lore, J.; Masuzaki, S.; Moncada, V.; Neubauer, O.; Ngo, T. T.; Oelmann, J.; Otte, M.; Perseo, V.; Pisano, F.; Puig Sitjes, A.; Rack, M.; Rasinski, M.; Romazanov, J.; Rudischhauser, L.; Schlisio, G.; Schmitt, J. C.; Schmitz, O.; Schweer, B.; Sereda, S.; Sleczka, M.; Suzuki, Y.; Vecsei, M.; Wang, E.; Wauters, T.; Wiesen, S.; Winters, V.; Wurden, G. A.; Zhang, D.; Zoletnik, S.

doi:10.1088/1741-4326/ab280f

Title: First divertor physics studies in Wendelstein 7-X

Journal Article · Mon Jul 22 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab280f· OSTI ID:1648980

^[1]; König, R. ^[2];

^[3]; Krychowiak, M. ^[2];

^[2];

^[2]; Niemann, H. ^[2]; Szepesi, T. ^[4];

^[2]; Ali, A. ^[2]; Anda, G. ^[4]; Baldzuhn, J. ^[2]; Barbui, T. ^[5]; Biedermann, C. ^[2]; Blackwell, B. D. ^[6];

^[2];

^[2]; Brakel, R. ^[2];

^[7]; Cai, J. ^[7] more »

Max Planck Inst. for Plasma Physics, Greifswald (Germany); Univ. of Greifswald (Germany)
Max Planck Inst. for Plasma Physics, Greifswald (Germany)
Max Planck Inst. for Plasma Physics, Greifswald (Germany); Univ. of Szczecin (Poland)
Wigner Research Center for Physics, Budapest (Hungary)
Univ. of Wisconsin, Madison, WI (United States)
Australian National Univ., Canberra, ACT (Australia)
Forschungszentrum Juelich (Germany)
Univ. of Cagliari (Italy)
Lab. for Plasma Physics, LPP-ERM/KMS, TEC Partner, Brussels (Belgium); Ghent Univ. (Belgium)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lab. for Plasma Physics, LPP-ERM/KMS, TEC Partner, Brussels (Belgium)
National Inst. for Fusion Science, Toki (Japan)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Thermadiag, ZA Le Pontet, Meyreuil (France)
CEA, IRFM, Saint Paul-lez-Durance (France)
Auburn Univ., AL (United States)
Univ. of Szczecin (Poland)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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. We report 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); EUROfusion Consortium

Contributing Organization:: The W-7X Team

Grant/Contract Number:: AC05-00OR22725; 633053; SC0014210

OSTI ID:: 1648980

Journal Information:: Nuclear Fusion, Vol. 59, Issue 9; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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Impact of a resonant magnetic perturbation field on impurity radiation, divertor footprint, and core plasma transport in attached and detached plasmas in the Large Helical Device Kobayashi, M.; Seki, R.; Masuzaki, S. Nuclear Fusion, Vol. 59, Issue 9 https://doi.org/10.1088/1741-4326/ab26e6	journal	July 2019
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