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 i...

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Bibliographic Details
Main Authors: Li Shi, Liu Wei, Su Xiao-bao, Yin He-jun
Format: Conference Proceeding
Language:English
Subjects:
Boundary conditions
Circuit simulation
Computational modeling
Computer simulation
Dielectric measurements
Dispersion
Finite element methods
Frequency measurement
Impedance
Resonant frequency
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Summary: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.
DOI:10.1109/IVESC.2004.1414289