Design Method of Focusing Magnetic Field for Restraining Dynamic Defocusing of High Efficiency TWT

In order to suppress the dynamic defocusing problem of the electron beam that often occurs in high-efficiency space TWT, this paper provides an effective focusing magnetic field design method and takes a traveling wave tube of a certain band as an example to introduce and explain. Under the premise of not affecting other working indexes, the focusing magnetic field designed by this method effectively suppresses its dynamic defocusing problem.