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EMC3-EIRENE simulation of first wall recycling fluxes in W7-X with relation to H-alpha measurements

W7-X Team; Winters, V. R.; Reimold, F.; König, R.; Krychowiak, M.; Romba, T.; Biedermann, C.; Bozhenkov, S.; Drewelow, P.; Endler, M.; Feng, Y.; Frerichs, H.; Fuchert, G.; Geiger, J.; Gao, Y.; Harris, J. H.; Jakubowski, M.; Kornejew, P.; Kremeyer, T.; ... mehr

Abstract:

In the Wendelstein 7-X stellarator, the main locations of particle sources are expected to be the carbon divertors, baffles and graphite heat shield first wall. In this paper, the heat shield is implemented in EMC3-EIRENE to understand the expected areas and magnitudes of the recycling flux to this component. It is found that in the simulation the heat shield is not a significant source of recycling neutrals. The areas of simulated recycling flux are shown to correlate well with footprints of plasma-wetting seen in post-experimental campaign in-vessel inspection photos. EMC3-EIRENE reconstruction of line-integrated H-alpha measurements at the heat shield indicate that the majority of emission does not come from local recycling neutrals. Rather, the H-alpha signals at the heat shield are dominated by ionization of neutrals which have leaked from the divertor/baffle region into the midplane. The magnitude of the H-alpha line emission from the synthetic reconstruction is consistent with the experiment, indicating that a large overestimation of heat shield recycling would occur if these measurements were assumed to be from local recycling sources. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000131712
Veröffentlicht am 23.04.2021
Originalveröffentlichung
DOI: 10.1088/1361-6587/abe39c
Scopus
Zitationen: 13
Web of Science
Zitationen: 13
Dimensions
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2021
Sprache Englisch
Identifikator ISSN: 0741-3335, 1361-6587
KITopen-ID: 1000131712
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Plasma physics and controlled fusion
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 63
Heft 4
Seiten Art.-Nr. 045016
Projektinformation EUROfusion_H2020 (EU, H2020, 633053)
Vorab online veröffentlicht am 04.03.2021
Nachgewiesen in Dimensions
Web of Science
Scopus
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