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Properties of boron layers deposited during boronisations in W7-X

Mayer, M. ; Balden, M.; Bräuer, T.; Cipciar, D.; Dhard, C. P.; Drews, P.; Elgeti, S.; Höschen, D.; Killer, C.; D. Naujoks; Sandri, N.; Schmid-Dencker, J.-H.; Vanó, L.; Viebke, H.; Volzke, O.; W7-X Team 1
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Boronisation was first used for wall conditioning in W7-X during the OP 1.2b operational period, which was characterized by the use of the fine-grain graphite Test Divertor Unit (TDU) and inertial cooling only. After this period, deposited layers were observed on all inner surfaces. Deposited layers were analyzed on 21 inner wall tiles using ion beam analysis methods, the deposited layers consisted mostly of boron with additional carbon and oxygen. During the operational period OP 2.1 with an actively water cooled divertor made of carbon fiber reinforced carbon, different materials were exposed during two individual boronisations using the multi-purpose manipulator. Deposited boronisation layers on the samples were analyzed using nuclear reaction analysis. The deposited layer thicknesses showed some variation depending on substrate material and surface roughness, but a systematic dependence on material and/or roughness was not observed. Under the typical boronisation condi-tions at W7-X, one A × h (Ampere times hour) of boronisation results in a boronisation layer with a thickness of about 30 ± 15 × 1015 B-atoms/cm2 (about 3 ± 1.5 nm) at the position of the multi-purpose manipulator. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000175580
Veröffentlicht am 25.10.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2024
Sprache Englisch
Identifikator ISSN: 2352-1791
KITopen-ID: 1000175580
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Nuclear Materials and Energy
Verlag Elsevier
Band 41
Seiten Art.-Nr.: 101778
Projektinformation EUROfusion (EU, EU 9. RP, 101052200)
Schlagwörter W7-X, Boronisation, Wall conditioning, Ion beam analysis, Multi-purpose manipulator
Nachgewiesen in Dimensions
Scopus
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