Design Strategies for Second Harmonic Gyrotrons in Nuclear Fusion Applications
Gyrotrons are high-power microwave sources that play an important role in the heating of plasmas for magnetically confined thermonuclear fusion applications. This paper presents a comprehensive study of two potential strategies for operating high-power megawatt-class fusion gyrotrons at the second harmonic of the electron cyclotron frequency which requires only half of the gyrotron cavity magnetic field. The first approach focuses on a coaxial cavity design that effectively suppresses fundamental competing modes, making it a robust solution for second harmonic operation. The second strategy discusses the injection of an external locking signal. Therefore, a quasi-optical mode converter was designed and tested capable of handling both, co- and counter-rotating modes.
Authors
- Zisis C. Ioannidis (ORCID: https://orcid.org/0000-0002-1233-9111)
- Konstantinos A. Avramidis (ORCID: https://orcid.org/0000-0001-9493-0468)
- M. Thumm (ORCID: https://orcid.org/0000-0003-1909-3166)
- Chuanren Wu (ORCID: https://orcid.org/0000-0002-2523-1476)
- Ioannis G. Tigelis (ORCID: https://orcid.org/0000-0002-8635-7726)
- Dimitrios V. Peponis (ORCID: https://orcid.org/0000-0001-9209-2595)
- Ioannis Chelis (ORCID: https://orcid.org/0000-0003-2997-2586)
- Lukas Feuerstein (ORCID: https://orcid.org/0000-0002-8938-034X)
- Moritz Misko
- S. Illy (ORCID: https://orcid.org/0000-0001-7242-1531)
- John Jelonnek (ORCID: https://orcid.org/0000-0002-0531-7600)
- Jinabo Jin
Institutions
- Karlsruhe Institute of Technology (DE)
- National and Kapodistrian University of Athens (GR)
Publication Details
- Published
- 2025-03-17
- DOI
- https://doi.org/10.23919/gemic64734.2025.10979097
- Citations
- 1
- Primary Topic
- Gyrotron and Vacuum Electronics Research
- Type
- article
- Field-Weighted Citation Impact
- 1.25
Funders
- Euratom Research and Training Programme