Higher Order Mode Radiations of Weakly Relativistic Oversized Backward Wave Oscillator Higher Order Mode Radiations of Weakly Relativistic Oversized Backward Wave Oscillator
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Higher order mode radiations of oversized K-band backward wave oscillator (BWO) are examined experimentally. By injecting an annular beam in the weakly relativistic region less than 100 kV, a beam mode with harmonic number <i>n </i>= 1 excites BWO radiations based on the TM<sub>01 </sub>surface wave. The same beam mode excites higher order modes leading to radiations in the U- and E-bands. The power levels of the higher order modes are hundreds of times smaller than that of BWO due to the surface wave. For a beam mode with <i>n </i>= 2, higher order mode radiations are in the F- and D-bands, up to about 100 GHz, which is about four times higher than the frequency of the TM<sub>01 </sub>surface wave. The power level of higher order mode radiation by the <i>n </i>= 2 beam mode decreases by a factor of hundreds from that of the <i>n </i>= 1 beam mode.
- Plasma and Fusion Research
Plasma and Fusion Research 8(0), 2401085-2401085, 2013
Japan Society of Plasma Science and Nuclear Fusion Research