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  • Fellinger, JorisMax Planck Institute for Plasma Physics, Germany (author)

Tungsten based divertor development for Wendelstein 7-X

  • Article/chapterEnglish2023

Publisher, publication year, extent ...

  • 2023
  • printrdacarrier

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  • LIBRIS-ID:oai:DiVA.org:ri-67489
  • https://urn.kb.se/resolve?urn=urn:nbn:se:ri:diva-67489URI
  • https://doi.org/10.1016/j.nme.2023.101506DOI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion).
  • Wendelstein 7-X, the world’s largest superconducting stellarator in Greifswald (Germany), started plasma experiments with a water-cooled plasma-facing wall in 2022, allowing for long pulse operation. In parallel, a project was launched in 2021 to develop a W based divertor, replacing the current CFC divertor, to demonstrate plasma performance of a stellarator with a reactor relevant plasma facing materials with low tritium retention. The project consists of two tasks: Based on experience from the previous experimental campaigns and improved physics modelling, the geometry of the plasma-facing surface of the divertor and baffles is optimized to prevent overloads and to improve exhaust. In parallel, the manufacturing technology for a W based target module is qualified. This paper gives a status update of project. It focusses on the conceptual design of a W based target module, the manufacturing technology and its qualification, which is conducted in the framework of the EUROfusion funded WPDIV program. A flat tile design in which a target module is made of a single target element is pursued. The technology must allow for moderate curvatures of the plasma-facing surface to follow the magnetic field lines. The target element is designed for steady state heat loads of 10 MW/m2 (as for the CFC divertor). Target modules of a similar size and weight as for the CFC divertor are assumed (approx. < 0.25 m2 and < 60 kg) using the existing water cooling infrastructure providing 5 l/s and roughly maximum 15 bar pressure drop per module. The main technology under qualification is based on a CuCrZr heat sink made either by additive manufacturing using laser powder bed fusion (LPBF) or by uniaxial diffusion welding of pre-machined forged CuCrZr plates. After heat treatment, the plasma-facing side of the heat sink is covered by W or if feasible by the more ductile WNiFe, preferably by coating or alternatively by hot isostatic pressing W based tiles with a soft OFE-Cu interlayer. Last step is a final machining of the plasma-exposed surface and the interfaces to the water supply lines and supports to correct manufacturing deformations.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Richou, M.CEA Institute for Magnetic Fusion Research, France (author)
  • Ehrke, G.Max Planck Institute for Plasma Physics, Germany (author)
  • Endler, M.Max Planck Institute for Plasma Physics, Germany (author)
  • Kunkel, F.Max Planck Institute for Plasma Physics, Germany (author)
  • Naujoks, D.Max Planck Institute for Plasma Physics, Germany (author)
  • Kremeyer, Th.Max Planck Institute for Plasma Physics, Germany (author)
  • Menzel-Barbara, A.Max Planck Institute for Plasma Physics, Germany (author)
  • Sieber, Th.Max Planck Institute for Plasma Physics, Germany (author)
  • Lobsien, J-FMax Planck Institute for Plasma Physics, Germany (author)
  • Neu, R.Max Planck Institute for Plasma Physics, Germany (author)
  • Tretter, J.Max Planck Institute for Plasma Physics, Germany (author)
  • Wang, Z.Max Planck Institute for Plasma Physics, Germany (author)
  • You, J-HMax Planck Institute for Plasma Physics, Germany (author)
  • Greuner, H.Max Planck Institute for Plasma Physics, Germany (author)
  • Hunger, K.Max Planck Institute for Plasma Physics, Germany (author)
  • Junghanns, P.Max Planck Institute for Plasma Physics, Germany (author)
  • Schneider, O.Max Planck Institute for Plasma Physics, Germany (author)
  • Wirtz, M.Forschungszentrum Jülich GmbH, Germany (author)
  • Loewenhoff, Th.Forschungszentrum Jülich GmbH, Germany (author)
  • Houben, A.Forschungszentrum Jülich GmbH, Germany (author)
  • Litnovsky, A.Forschungszentrum Jülich GmbH, Germany (author)
  • Fraysinnes, P-ECEA LITEN DTCH LCA, France (author)
  • Emonot, P.CEA LITEN DTCH LCA, France (author)
  • Roccella, S.ENEA Frascati Research Centre, Itay (author)
  • Widlund, OlaRISE,Kemi och Tillämpad mekanik(Swepub:ri)OlaWid@ri.se (author)
  • Koncar, B.Jožef Stefan Institute, Slovenia (author)
  • Tekavčič, M.Jožef Stefan Institute, Slovenia (author)
  • Max Planck Institute for Plasma Physics, GermanyCEA Institute for Magnetic Fusion Research, France (creator_code:org_t)

Related titles

  • In:Nuclear Materials and Energy372352-1791

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