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Design verification of the gyrotron diamond output window for the upgrade of the ECRH system at W7-X

Aiello, Gaetano; Avramidis, Konstantinos A.; Gantenbein, Gerd; Jelonnek, John; Jin, Jianbo; Laqua, Heinrich P.; Meier, Andreas; Scherer, Theo; Strauss, Dirk; Thumm, Manfred

Abstract (englisch):
The 10 MW electron cyclotron resonance heating (ECRH) system at the stellarator Wendelstein 7-X (W7-X) currently relies on the successful operation of continuous wave (CW) 1 MW, 140 GHz gyrotrons which have chemical vapor deposition (CVD) diamond output windows cooled by the industrial silicon oil Dow Corning 200(R) 5 cSt. The window features a 1.8 mm thick diamond disk brazed to two copper cuffs with an aperture of 88 mm, which are then integrated in a steel housing. In the context of the upgrade of the ECRH system towards higher microwave power, this gyrotron design has been significantly advanced to fulfill the requirement of 1.5 MW CW operation, still at 140 GHz. A prototype of this new gyrotron is under development at Thales, France. This paper reports the computational fluid dynamics (CFD) conjugated heat transfer and structural analyses of the diamond window performed using the commercial code ANSYS V19.2 to investigate its performance at 1.5 MW operation. Furthermore, sensitivity studies were also carried out with respect to the absorbed power in the disk and the mm-wave beam radius at the window location. These analyses showed that the window design of the existing 1 MW gyrotrons still works quite well at higher power operation, thus verifying the performance of the window. ... mehr

Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Institut für Angewandte Materialien (IAM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 04.2021
Sprache Englisch
Identifikator ISSN: 0920-3796
KITopen-ID: 1000129210
Weitere HGF-Programme 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in Fusion engineering and design
Verlag Elsevier
Band 165
Seiten 112262
Projektinformation EUROfusion (EU, H2020, 633053)
Nachgewiesen in Scopus
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