[1] M Thumm. State-of-the-art of high-power gyro-devices and free electron masers. Journal of Infrared, Millimeter, and Terahertz Waves, 41, 1-140(2020).
[2] K R Chu. Overview of research on the gyrotron traveling-wave amplifier. IEEE Transactions on Plasma Science, 30, 903-908(2002).
[3] C H Du, P K Liu. Millimeter-wave gyrotron traveling-wave tube amplifiers(2014).
[4] K R Chu, H Y Chen, C L Hung et al. Theory and experiment of ultrahigh-gain gyrotron traveling wave amplifier. IEEE Transactions on Plasma Science, 27, 391-404(1999).
[5] R Yan, Y Tang, Y Luo. Design and experimental study of a high-gain W-band gyro-TWT with nonuniform periodic dielectric loaded waveguide. IEEE Transactions on Electron Devices, 61, 2564-2569(2014).
[6] J R Sirigiri, M A Shapiro, R J Temkin. High-power 140-GHz quasioptical gyrotron traveling-wave amplifier. Physical review letters, 90, 258302(2003).
[7] E A Nanni, S Jawla, S M Lewis et al. Photonic-band-gap gyrotron amplifier with picosecond pulses. Applied Physics Letters, 111, 233504(2017).
[8] D Liu, X Tang, Y Yan et al. Design of confocal waveguide interaction structure for a 220 GHz gyro-TWT. Journal of ElEctromagnEtic WavEs and applications, 31, 650-662(2017).
[9] C An, D Zhang, J Zhang et al. Theoretical analysis and PIC simulation of a 220-GHz second-harmonic confocal waveguide gyro-TWT amplifier. IEEE Transactions on Electron Devices, 66, 4016-4021(2019).
[10] E Wang, X Zeng, B Liu et al. Experimental study of high-power gyrotron traveling-wave tube with periodic lossy material loading. IEEE Transactions on Plasma Science, 40, 1846-1853(2012).
[11] C H Du, T H Chang, P K Liu et al. Design of a W-band gyro-TWT amplifier with a lossy ceramic-loaded circuit. IEEE transactions on electron devices, 60, 2388-2394(2013).
[12] M Thottappan. Design and efficiency enhancement studies of periodically dielectric loaded W-band gyro-TWT amplifier. IEEE Transactions on Electron Devices, 67, 2925-2932(2020).
