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Multifaceted Simulations Reproducing Experimental Results from the 1.5-MW 140-GHz Preprototype Gyrotron for W7-X

Avramidis, Konstantinos A. 1; Ioannidis, Zisis C. 1; Illy, Stefan 1; Jin, Jianbo 1; Ruess, Tobias ORCID iD icon 1; Aiello, Gaetano ORCID iD icon 2; Thumm, Manfred 1; Jelonnek, John 1
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)
2 Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

A multifaceted simulation procedure, addressing the electron beam properties, the beam-wave interaction, and the internal losses, has been used for the simulation of the experimental operation of a 1.5-MW 140-GHz short-pulse preprototype gyrotron. The preprototype is related to the development of 1.5-MW gyrotrons for the upgrade of the electron cyclotron resonance heating system at the stellarator W7-X. A very good reproduction of experimental results has been achieved by simulation, without resorting to arbitrary speculations. This validated the numerical tools as well as the design and fabrication of the short-pulse preprototype, which fully reached the target of efficient 1.5-MW operation in millisecond pulses. Special attention has been given to simulating the possibility of parasitic after-cavity interaction in the gyrotron launcher. Also, parasitic backward-wave excitation in the gyrotron cavity has been demonstrated by simulation, at a frequency and voltage range in agreement with experimentally observed parasitic oscillations. This offers an additional possibility with respect to the origin of deleterious parasitic oscillations in high-power gyrotrons, which are usually attributed mainly to the gyrotron beam tunnel.

Postprint §
DOI: 10.5445/IR/1000133833
Veröffentlicht am 19.11.2021
DOI: 10.1109/TED.2021.3075653
Zitationen: 4
Web of Science
Zitationen: 3
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0018-9383, 0096-2430, 0197-6370, 1557-9646, 2379-8653, 2379-8661
KITopen-ID: 1000133833
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in IEEE Transactions on Electron Devices
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Band 68
Heft 6
Seiten 3063-3069
Projektinformation EUROfusion_H2020 (EU, H2020, 633053)
Nachgewiesen in Scopus
Web of Science
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