螺旋慢波结构参数变化对行波管冷试验特性的影响

IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839) Pub Date : 2004-09-06 DOI:10.1109/IVESC.2004.1414289

Li Shi, Liu Wei, Su Xiao-bao, Yin He-jun

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摘要

本文利用计算机代码MAFIA中的拟周期边界条件来确定螺旋慢波结构对色散和轴向相互作用阻抗的影响，并利用有限元软件ansys模拟螺旋压力畸变。结果表明，随着螺旋带轴向宽度和轴向高度的变化，对相速度的影响较小，而对相互作用阻抗的影响较大。在螺旋带的轴向宽度和轴向高度上都有一个最佳的相互作用阻抗点。当径向相对变形小于1%时，螺旋变形增加了色散和轴上相互作用阻抗。当径向相对变形大于1%时，轴向相互作用阻抗减小。

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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.

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IVESC 2004. The 5th International Vacuum Electron Sources Conference Proceedings (IEEE Cat. No.04EX839)

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