Yin He-jun

Two-dimensional numerical simulation for gun of TWT

Summary form only given. This paper presents the numerical simulation method by software MAFIA, TAU and EGUN to calculate the electron-gun of traveling-wave tube. The simulation result are good consistency with part experiment data. The average calculation precise may be less than 5%. It proves that these electro-magnetic software are capable of simulating the electron-gun, making some research for computer simulation to satisfy practical engineering design demand in computation precise. The calculation time is compared for these software.

Effect of helical slow-wave structure parameter variations on TWT cold-test characteristics

In this paper, the quasi-periodic boundary conditions in the computer code MAFIA is used to determine the effect on dispersion and on-axis interaction impedance of helical slow-wave structure and the finite element method software-ANSYS is used to simulate the helix pressure distortion. The result is that, with the variations of axial width and height of the helical tape, only a slight effect in the phase velocity, but more effect in the interaction impedance. There is a best point on both axial width and height of the helical tape for the interaction impedance. Both dispersion and on-axis interaction impedance are increased with helix deformation, in which the radial relative deformation is less then 1%. While radial relative deformation is more then 1%, the on-axis interaction impedance is decreased.

Application of neural network to design of TWT

In this paper, the method of back-propagation network in the computer code MATLAB is used to simulate data, which be applied to the design of traveling-wave tube. Compared with the quadratic interpolation, the simulation result according by the BP network was closer to the effect on dispersion in the test.