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13 Dec 2010

Volume 97, Issue 24, Articles (24xxxx)

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Appl. Phys. Lett. 97, 241101 (2010); http://dx.doi.org/10.1063/1.3525583 (3 pages)

Kanghee Lee and Jaewook Ahn
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Asymmetric-mode competition in a relativistic backward wave oscillator with a coaxial slow-wave structure

Xingjun Ge, Huihuang Zhong, Baoliang Qian, Jun Zhang, Lie Liu, Liang Gao, Chengwei Yuan, and Juntao He

Appl. Phys. Lett. 97, 241501 (2010); http://dx.doi.org/10.1063/1.3526726 (3 pages) | Cited 7 times

Online Publication Date: 15 December 2010

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The initial experimental results of an L-band relativistic backward wave oscillator with a coaxial slow-wave structure are presented. The asymmetric-mode-competition mechanism in the device is investigated theoretically and experimentally. It is shown that the diode voltage, guiding-magnetic field, and concentricity play a key role in the suppression and excitation of the asymmetric-mode (coaxial quasi-TE11 mode). In the experiments, the asymmetric-mode with a frequency of 2.05 GHz is suppressed and excited, which is in good agreement with the theoretical results.
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84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
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