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Thermal and mechanical analyses of W7-X plasma facing components for operation phase 2

W7-X Team; Wang, Zhongwei; Boscary, Jean; Schauer, Felix; Gantenbein, Gerd; Huber, Martina; Illy, Stefan; Jelonnek, John; Kobarg, Thorsten; Lang, Rouven; Leonhardt, Wolfgang; Mellein, Daniel; Papenfuß, Daniel; Scherer, Theo; Thumm, Manfred; Wadle, Simone; Weggen, Jörg

Abstract (englisch):
After the successful short pulse operation phase 1 (OP1) of the stellarator Wendelstein 7-X with maximal plasma energies of 200 MJ, the upcoming long pulse OP2 aims at stepwise higher energies up to 18 GJ. With the knowledge of partly unexpected experimental heat load distributions on plasma facing components (PFC), their allowable loads were re-evaluated which consequently lead to some adaptation work.
The divertor target modules TM5 h and TM6 h were loaded more than expected during OP1. This triggered a detailed transient and stationary analysis which revealed a high sensitivity of the thermal response to the heating power distribution.
At the baffles, cracks were detected just before assembly for OP1 at the braze joints between CuCrZr heat sinks which carry the graphite tiles, and the stainless steel (SS) cooling pipes. Due to large temperature differences between parts of the pipes and support structure the braze becomes heavily stressed during the high thermal loads in OP2. Multiple optimization analyses led to the decision to release thermomechanical stresses by loosening the connections between the heat sinks and steel structures of the modules.
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DOI: 10.1016/j.fusengdes.2020.111882
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 12.2020
Sprache Englisch
Identifikator ISSN: 0920-3796
KITopen-ID: 1000127863
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in Fusion engineering and design
Verlag Elsevier
Band 161
Seiten Article: 111882
Nachgewiesen in Scopus
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