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Frequency Stabilization of Megawatt-Class 140 GHz Gyrotrons at W7-X Using an Off-the-Shelf PLL System

Krier, Laurent; Avramidis, Konstantinos A.; Braune, Harald; Gantenbein, Gerd; Illy, Stefan; Ioannidis, Zisis; Jelonnek, John; Laqua, Heinrich P.; Marsen, Stefan; Moseev, Dmitry; Noke, Frank; Pagonakis, Ioannis Gr.; Ruess, Tobias ORCID iD icon; Rzesnicki, Tomasz; Stange, Torsten; Thumm, Manfred; Wolf, Robert C.

Abstract (englisch):

An off-the-shelf Phase-Locked Loop (PLL) system is used to stabilize the free-running oscillation frequencies of the 140 GHz, 1 MW CW gyrotrons of the companies Thales, France, and CPI, USA, that both operate at the ECRH system of the Wendelstein 7-X (W7-X) stellarator at IPP Greifswald, Germany. Both tubes are equipped with diode-type Magnetron Injection Guns (MIGs). Considering each of both type of gyrotrons as a Voltage Controlled Oscillator (VCO), each individual gyrotron is controlled by the variation of the body voltage. The results of the experiments demonstrate the capability of the developed and implemented inexpensive off-the-shelf PLL system. It is possible to stabilize the oscillation frequency within a full -20 dB bandwidth of < 100 kHz. Applications such as Collective Thomson Scattering (CTS) systems to accurately diagnose the ions in fusion plasmas could benefit from this development in future.

Postprint §
DOI: 10.5445/IR/1000141810
Veröffentlicht am 21.10.2022
DOI: 10.1109/IRMMW-THz50926.2021.9566847
Zitationen: 1
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochfrequenztechnik und Elektronik (IHE)
Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 20.10.2021
Sprache Englisch
Identifikator ISBN: 978-1-72819-424-0
ISSN: 2162-2035
KITopen-ID: 1000141810
HGF-Programm 31.13.02 (POF IV, LK 01) Plasma Heating & Current Drive Systems
Erschienen in 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)
Veranstaltung 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz 2021), Online, 30.08.2021 – 03.09.2021
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Seiten 1–2
Projektinformation EUROfusion_H2020 (EU, H2020, 633053)
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