caa a22 4500 477123961 CHVBK 20180405111644.0 cr unu---uuuuu 170330e19971001xx s 000 0 eng 10.1007/BF02678349 doi (NATIONALLICENCE)springer-10.1007/BF02678349 Nonlinear analysis of a multi-cavity gyro-twystron [Elektronische Daten] [C. Kou, M. Wu, Fouriers Tseng] To preserve high gain, high efficiency and high power merits of gyroklystron, a gyro-twystron is designed using an electron beam with α(v⊥/vz) greater than unity. With a multi-cavity section of high gain, the length of the waveguide output section can be made shorter than the threshold length of the absolute instability without losing total system gain. Numerical simulations are carried out to analyze a ka-band gyro- twystron consisting of three TE111 mode cavities and an output section of a TE11 mode waveguide. Stability study is performed to ensure the tube without self-excited oscillations. With α=1.5, the 3-dB linear and saturated gain bandwidth in excess of 2 % can be obtained by stagger tuning for an 80 kV, 3 A electron beam with 5 % axial velocity spread. The maximum saturated gain is more than 55 dB at 33 % efficiency. By tapering the magnetic field of the last 2 cm of the interaction region, the efficiency can be increased to 43 % without degrading the bandwidth, which corresponds to an output power of 103 kW. Plenum Publishing Corporation, 1997 gyro-twystron nationallicence Kou C. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut Wu M. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut Tseng Fouriers Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/10(1997-10-01), 1857-1883 0195-9271 18:10<1857 1997 18 10762 https://doi.org/10.1007/BF02678349 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02678349 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kou C. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Wu M. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut NATIONALLICENCE 700 1- Tseng Fouriers Department of Physics, National Tsing Hua University, Hsinchu, Taiwan, Republic of China aut NATIONALLICENCE 773 0- International Journal of Infrared and Millimeter Waves Kluwer Academic Publishers-Plenum Publishers 18/10(1997-10-01), 1857-1883 0195-9271 18:10<1857 1997 18 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer