Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 38, Issue 7, Pages 824-837Publisher
SPRINGER
DOI: 10.1007/s10762-017-0378-x
Keywords
Gyrotron; Second harmonic; Mode competition; Reflection; Frequency tunability
Funding
- Russian Foundation for Basic Research [15-02-01798a]
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Effect of delayed reflection on operation of a second-harmonic terahertz (THz)-band gyrotron is studied. Theoretical analyses, numerical calculations, and experimental observations for the 0.394-THz Fukui University (FU) and continuous wave (CW) IIB gyrotron are presented. The reflections decrease starting current and expand frequency tunability range owing to excitation of high-order axial modes. They also increase frequency stability, i.e., reduce frequency change due to variation of the magnetic field. In addition, the reflections strongly affect mode competition causing suppress of the second-harmonic mode by the fundamental one and vice versa or, in the case of cooperative mode interaction, mutual power increase.
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