Abstract-Excitation of Hybrid Space-Surface Waves in Clinotrons with Non-uniform Grating

E. M. Khutoryan, Yu. S. Kovshov, A. S. Likhachev, S. S. Ponomarenko, S. A. Kishko, K. A. Lukin, V. V. Zavertanniy, T. V. Kudinova, S. A. Vlasenko, A. N. Kuleshov, T. Idehara,

https://link.springer.com/article/10.1007/s10762-017-0453-3

Excitation of surface (slow), space (fast), and hybrid surface-space waves in BWO-clinotron with periodically non-uniform grating has been studied both theoretically and experimentally. It is shown that an interaction of electron beam with hybrid surface-space wave may be more effective than with surface wave because of higher Q-factor, and than with space wave because of higher impedance. The experimental test results of both 100-GHz CW clinotron with non-uniform three-stage grating and of 130-GHz CW clinotron with four-stage grating showed the excitation of radiation with output power more than 1 W and some specific features of electronic frequency tuning.

Abstract-Simultaneous Stabilization of Gyrotron Frequency and Power by PID Double Feedback Control on the Acceleration and Anode Voltages

https://link.springer.com/article/10.1007/s10762-017-0374-1

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• E. M. KhutoryanEmail author
• T. Idehara
• A. N. Kuleshov
• Y. Tatematsu
• Y. Yamaguchi
• Y. Matsuki
• T. Fujiwara
• In this paper, we present the results of simultaneous stabilization of both the frequency and the output power by a double PID feedback control on the acceleration and anode voltages in the 460-GHz gyrotron FU CW GVI, also known as “Gyrotron FU CW GO-1” (according to the nomenclature adopted at Osaka University). The approach used in the experiments is based on the modulation of the cyclotron frequency and the pitch factor (velocity ratio) of the electron beam by varying the acceleration and the anode voltages, respectively. In a long-term experiment, the frequency and power stabilities were made to be better than ±10−6 and ±1%, respectively.