Multi-frequency gyrotron with multi-cavity configurations

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04509
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: University of Fukui
• Principal Investigator: Yuusuke Yamaguchi 福井大学, 遠赤外領域開発研究センター, 助教 (10466675)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: テラヘルツ発振 / 超多周波数発振

Outline of Final Research Achievements

We have developed a high-frequency gyrotron that provides a large number of oscillation frequencies in the terahertz range. In this study, the number of oscillation modes (frequencies) has been increased by adopting a two-stage and then a three-stage cavity resonator in a gyrotron. The oscillation experiments showed that oscillation in many modes, which could not be obtained with a single resonator, was possible. 22 modes were observed in the two-stage resonator and 28 modes were observed in the three-stage resonator in the frequency range of 110 to 220 GHz. In addition, continuous frequency tunability was realized with backward wave oscillation, and the occupancy rate in the same frequency range was about 27% for the two-stage resonator and about 30% for the three-stage resonator. The output power is more than several watts making it applicable to a wide range of applications. This improvement in frequency tunability enhances the versatility of the gyrotron as a terahertz source.

Free Research Field

高周波工学

Academic Significance and Societal Importance of the Research Achievements

テラヘルツ帯（0.1 ～ 10 THz）の電磁波の需要が高まる中，同周波数帯で高出力かつ連続発振可能な電子管（ジャイロトロン）に注目が集まりつつある．これまで，ジャイロトロンは単一の空胴共振器にて設計，運用されてきた．本研究では，ジャイロトロンに複数の共振器を組み込むことで，より多くの周波数での発振を可能とした．
これまでは，周波数の異なる電磁波を得るために，複数のジャイロトロンを用いる必要があったが，本研究の成果により，単一のジャイロトロンで多くの周波数の電磁波を供給できるようになる．これは，同周波数帯の電磁波の応用研究の促進に，大きく寄与するものである．