caa a22 4500 445306084 CHVBK 20180317142613.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s10762-010-9760-7 doi (NATIONALLICENCE)springer-10.1007/s10762-010-9760-7 Theoretical and Experimental Investigation of a Ka-band Gyro-TWT with Lossy Interaction Structure [Elektronische Daten] [Hui Wang, Hongfu Li, Yong Luo, Ran Yan] The stability analysis of a Ka-band gyrotron traveling-wave tube amplifier (gyro-TWT) operating in the circular TE01 mode at the fundamental cyclotron harmonic is presented. The small signal linear theory is used to analyze the amplification of operation mode and oscillation of parasitic modes. The optimum dielectric parameters including loss layer thickness and permittivity are given. Propagation loss of operation mode is 3dB/cm with the thickness of loss layer d = 0.7mm and relative permittivity ξ″ = 11−6j, and propagation loss per unit length of parasitic modes TE11, TE21, TE02 at each oscillation frequency (24.85GHz, 27.85GHz, 61.2GHz) is 2.5dB/cm, 6dB/cm, 7.5dB/cm, respectively, sufficient to suppress oscillations of operation and parasitic modes. Taking advantage of the optimized parameters of loaded dielectric, a high gain scheme has been demonstrated in a 34-GHz, TE01-mode gyro-TWT, producing 160kW saturated output power at 40dB stable gain and 22.8% efficiency with a 3-dB bandwidth of 5%. Springer Science+Business Media, LLC, 2010 Gyro-TWT nationallicence The small signal linear theory nationallicence Oscillation nationallicence Distributed-loss loaded nationallicence Wang Hui Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut Li Hongfu Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut Luo Yong Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut Yan Ran Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/2(2011-02-01), 172-185 1866-6892 32:2<172 2011 32 10762 https://doi.org/10.1007/s10762-010-9760-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-010-9760-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Hui Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut NATIONALLICENCE 700 1- Li Hongfu Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut NATIONALLICENCE 700 1- Luo Yong Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut NATIONALLICENCE 700 1- Yan Ran Institute of High Energy Electronics, University of Electronic Science and Technology of China, 610054, Chengdu, Sichuan, China aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/2(2011-02-01), 172-185 1866-6892 32:2<172 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer