Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 41, Issue 6, Pages 697-710Publisher
SPRINGER
DOI: 10.1007/s10762-020-00695-1
Keywords
Gyrotron; Mode competition; Reflection; Collective Thomson scattering; Plasma diagnostics; Multi-frequency oscillation
Funding
- JSPS KAKENHI [25247094, 17H03509]
- International Collaboration Program of Research Center for Development of Far-Infrared Region, University of Fukui
- Russian Foundation for Basic Research [1802-00839]
- Ministry of Science and Higher Education of Russia
- Grants-in-Aid for Scientific Research [17H03509, 25247094] Funding Source: KAKEN
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Equi-distantly distributed multi-peak frequency spectrum was observed in a high-power 300-GHz band gyrotron for the case of strong reflection off the vacuum window. An oscillation mode different from the design mode can oscillate by adjusting the magnetic field in the cavity. However, a large fraction of the output wave is reflected by the vacuum window. The reflected wave returns to the cavity through an internal mode converter. The azimuthal rotating direction of the reflected wave is opposite to that of the oscillating mode. A theoretical calculation of mode competition between the oscillating co-rotating mode and the counter-rotating mode originating from the reflected wave very well reproduces the observed frequency spectrum. The multi-peak frequency spectrum stems from periodic amplitude oscillation caused by the mode competition between the co-rotating mode and the counter-rotating mode. The frequency interval between the peaks is not simply decided by the round-trip time between the cavity and the vacuum window but determined by the period of the amplitude oscillation.
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