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High-efficiency, long-pulse operation of MW-level dual-frequency gyrotron, 84/126GHz, for the TCV Tokamak

Alberti, Stefano; Avramidis, Konstantinos A.; Bin, William; Bertinetti, Andrea; Dubray, Jérémie; Fasel, Damien; Garavaglia, Saul; Genoud, Jérémy; Goodman, Timothy; Hogge, J. P.; Isoz, Pierre François; Lavanchy, Pierre; Legrand, François; Marletaz, Blaise; Masur, Jonathan; Moro, Alessandro; Pagonakis, Ioannis Gr.; Silva, Miguel; Siravo, Ugo; Toussaint, Matthieu

Abstract (englisch):
The first unit of the dual-frequency gyrotron, 84126GHz/1MW/2s, for the upgrade of the TCV ECH system has been delivered and is presently being commissioned. During a first phase, long-pulse operation (TRF gt 0.5 mathrm{s}) has been achieved and powers in excess of 0.93MW/1.1s and 1MW/1.2s have been measured in the evacuated RF-load at the two frequencies, 84GHz (TE {17,5} mode) and 126GHz (TE {26,7} mode), respectively. Considering the different rf losses in the experimental setup, the power level generated in the gyrotron cavity is in excess of 1.1MW and 1.2MW, with a corresponding electronic efficiency of 35% and 36%. These values are in excellent agreement with the design parameters and would likely lead to a gyrotron total efficiency higher than 50% in case of implementation of a depressed collector. The gyrotron behavior is remarkably reliable and robust with the pulse length extension to 2s presently only limited by external auxiliary systems.

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Postprint §
DOI: 10.5445/IR/1000100042
Veröffentlicht am 22.10.2020
Originalveröffentlichung
DOI: 10.1109/IRMMW-THz.2019.8874423
Scopus
Zitationen: 1
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Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2019
Sprache Englisch
Identifikator ISBN: 978-1-5386-8285-2
ISSN: 2162-2027
KITopen-ID: 1000100042
HGF-Programm 31.03.02 (POF III, LK 01) Plasma Heizsysteme
Erschienen in 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), Paris, F, September 1-6, 2019
Veranstaltung 44th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2019), Paris, Frankreich, 01.09.2019 – 06.09.2019
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Seiten Article no: 8874423
Serie Conference Proceeding
Projektinformation EUROfusion (EU, H2020, 633053)
Vorab online veröffentlicht am 21.10.2019
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