Qianzhong Xue

TL;DR: In this article, a systematic stability analysis method using theoretical tools combining linear and self-consistent nonlinear theory is presented to analyze an ultra-high gain gyrotron traveling-wave (gyro-TWT) amplifier operated in the fundamental TE11 mode in the Ka-band.

TL;DR: In this paper, the mode identification principles, mode structures, and propagation characteristics of electromagnetic modes in a metal cylindrical waveguide coated with an inside layer of lossy dielectric have been investigated for gyro-traveling-wave-tube applications.

TL;DR: In this paper, two kinds of high compression electron gun with the solid or hollow beams, the derivative electron optics systems using the compact permanent magnet uniform focusing and the shared efficient interaction circuit based on the multigap ladder cavity, have been studied in detail and well designed through a mass of calculations.

TL;DR: An integrated planar three-beam electron optics system is designed for our 220-GHz cascaded folded waveguide TWT in this paper, where a uniform magnetic focusing structure is used for constraining the 3-beam array with adjacent beam separation of 8 mm.

TL;DR: In this article, a metal cylindrical waveguide coated with an inside layer of lossy dielectric which affects the propagation characteristics of a guided electromagnetic mode is investigated for gyrotron-traveling-wave tube (gyro-TWT) amplifier applications.