First divertor physics studies in Wendelstein 7-X

Autor: Tom Wauters, Daniel Dunai, A. LeViness, Victoria Winters, P. Kornejew, Adnan Ali, U. Wenzel, Fabio Pisano, R. Brakel, J. H. Harris, Ye. O. Kazakov, J. Cosfeld, R. König, M. Krychowiak, M. Sleczka, Hans-Stephan Bosch, T. Ngo, Kenneth Hammond, A. Puig Sitjes, M. Vecsei, G. Kocsis, Yasuhiro Suzuki, Tamás Szepesi, J.C. Schmitt, Matthias Otte, E. Wang, V. Moncada, P. Drewelow, S. Brezinsek, A. Knieps, Suguru Masuzaki, Juri Romazanov, M. Kobayashi, D. Zhang, Joris Fellinger, Oliver Schmitz, J. Oelmann, Boyd Blackwell, T. Kremeyer, Malte Henkel, G. Anda, S. Sereda, B. Schweer, Olaf Neubauer, A. Goriaev, S. A. Bozhenkov, Y. Feng, H. Frerichs, T. Sunn Pedersen, Yu Gao, G. A. Wurden, Dorothea Gradic, O. P. Ford, G. Schlisio, Dag Hathiramani, T. Dittmar, S. Lazerzon, S. Wiesen, S. Zoletnik, Florian Effenberg, J. Baldzuhn, P. Drews, Holger Niemann, J. Geiger, T. Barbui, Andreas Dinklage, J. W. Coenen, A. Kirschner, Carsten Killer, M. Rack, G. Fuchert, J. Cai, Barbara Cannas, M. Endler, Jeremy Lore, Y. Li, M. W. Jakubowski, Marcin Rasinski, C. Li, S. C. Liu, Yunfeng Liang, Christoph Biedermann, L. Rudischhauser, V. Perseo
Přispěvatelé: Max Planck Institut für Plasma Physik and Excellence Cluster, KFKI Research Institute for Particle and Nuclear Physics (KFKI-RMKI), University of Wisconsin, Madison, Australian National University, GeoForschungsZentrum (GFZ), Università degli Studi di Cagliari = University of Cagliari (UniCa), Laboratory for Plasma Physics, LPP-ERM/KMS, TEC Partner, Brussels, Belgium, Computer Science and Mathematics Division, Oak Ridge National Laboratory, National Institute for Fusion Science, Toki, Japan, Princeton, Thermadiag, ZA, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), International Center for Climate and Global Change Research and School of Forestry and Wildlife Sciences, Auburn University, University of Szczecin, Szczecin, Poland, Los Alamos National Laboratory (LANL), W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society
Rok vydání: 2019
Předmět:
Zdroj: Nuclear Fusion
Nuclear fusion 59(9), 096014-(2019). doi:10.1088/1741-4326/ab280f
Nuclear Fusion, 2019, 59, pp.096014. ⟨10.1088/1741-4326/ab280f⟩
ISSN: 0029-5515
0741-3335
1748-0221
1741-4326
DOI: 10.1088/1741-4326/ab280f
Popis: International audience; The Wendelstein 7-X (W7-X) optimized stellarator fusion experiment,which went into operation in 2015, has been operating since 2017 with anun-cooled modular graphite divertor. This allowed first divertor physicsstudies to be performed at pulse energies up to 80 MJ, as opposed to 4MJ in the first operation phase, where five inboard limiters wereinstalled instead of a divertor. This, and a number of other upgrades tothe device capabilities, allowed extension into regimes of higher plasmadensity, heating power, and performance overall, e.g. setting a newstellarator world record triple product. The paper focuses on the firstphysics studies of how the island divertor works. The plasma heat loadsarrive to a very high degree on the divertor plates, with only minorheat loads seen on other components, in particular baffle structuresbuilt in to aid neutral compression. The strike line shapes andlocations change significantly from one magnetic configuration toanother, 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 alsolarge, up to about 1.5 m2, which bodes well for futureoperation phases. Peak local heat loads onto the divertor were ingeneral benign and project below the 10 MW m?2 limit of thefuture water-cooled divertor when operated with 10 MW of heating power,with the exception of low-density attached operation in the high-iotaconfiguration. The most notable result was the complete (in all 10divertor units) heat-flux detachment obtained at high-density operationin hydrogen.
Databáze: OpenAIRE
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