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Inspection of W 7-X plasma-facing components after the operation phase OP1.2b: observations and first assessments

W7-X Team; Dhard, C. P.; Äkäslompolo, S.; Balden, M.; Baldzuhn, J.; Biedermann, C.; Bräuer, T.; Brezinsek, S.; Endler, M.; Hayashi, Y.; Hwangbo, D.; Kajita, S.; Krause, M.; Kornejew, P.; Masuzaki, S.; Mayer, M.; Motojima, G.; Naujoks, D.; Otte, M.; Rohde, V.; Gantenbein, Gerd; ... mehr

Abstract:
Due to its twisted magnetic field configurations, the orientation of the plasma-facing components (PFCs) of the Wendelstein 7-X stellarator is changed from bean shape to triangular shape along the plasma axis within a module. The PFCs consist of graphite (test divertor units, baffles, head shield tiles, toroidal divertor closures) and stainless steel components (wall panels, pumping gap panels, poloidal closures). In order to document the status of these components as well as to get the first footprints of the plasma-wall interactions (PWI) that occurred during the plasma campaign, a detailed inspection of the whole plasma vessel after the plasma campaign is of vital importance. Such an inspection was carried out after the operation phase OP1.2b completed in October 2018. A number of observations were made, such as, molten stainless steel drops, melting of a long term probe, deposition on steel panels, arc traces, loosely bound particles and deposition stripes on the plasma vessel hidden behind the graphite tiles. In order to understand the possible causes, their implication and steps to avoid some of these problems for the next phase of machine operation, an assessment was made. ... mehr



Originalveröffentlichung
DOI: 10.1088/1402-4896/ab4b3f
Web of Science
Zitationen: 1
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2020
Sprache Englisch
Identifikator ISSN: 0031-8949, 1402-4896
KITopen-ID: 1000121071
HGF-Programm 31.03.02 (POF III, LK 01)
Plasma Heizsysteme
Erschienen in Physica scripta
Band 2020
Heft T171
Seiten 014033
Projektinformation EUROfusion (EU, H2020, 633053)
Nachgewiesen in Web of Science
Scopus
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