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Multistage Depressed Collectors for Gyrotrons with Azimuthal Electric Field

Ell, Benjamin ORCID iD icon; Pagonakis, Ioannis Gr.; Wu, Chuanren ORCID iD icon; Albert, David; Gantenbein, Gerd; Illy, Stefan; Kobarg, Thorsten; Thumm, Manfred; Jelonnek, John

Abstract (englisch):

Gyrotrons are used for electron cyclotron resonance heating as well as for non-inductive current drive in fusion experimental reactors. The gyrotron operational efficiency is considered as a very important factor for future fusion power plants. Single-stage depressed collectors have been successfully used in gyrotrons. The key of a significant increase of the gyrotron efficiency is the development of an efficient multistage depressed collector (MDC) for the annular spent electron beam. The design of an MDC system for gyrotrons is not trivial due to the fact that the spent electron beam is confined by a relatively strong magnetic field in the collector region. For that reason, the electrostatic sorting used in TWT and klystron, MDCs is not applicable to the spent electron beam in gyrotrons. The separation of the spent beam electrons of a high power gyrotron based on the E×B drift concept was proposed in 2008 [1] and is considered as the most promising method. Based on this concept, a systematic investigation of many design approaches with E×B drift has been conducted during the last years [1-6]. In this work, a plurality of different designs is presented that produce an azimuthal electric field by a helical gap to separate the spent electron beam in order to achieve high collector efficiency. ... mehr

Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Vortrag
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000097201
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Veranstaltung Workshop on RF Heating Technology of Fusion Plasmas (US-EU-JPN RF Heating Technology Workshop) (2019), Freiburg im Breisgau, Deutschland, 09.09.2019 – 12.09.2019
Projektinformation EUROfusion_H2020 (EU, H2020, 633053)
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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