NDLI: Computational investigation of experimental interaction impedance obtained by perturbation for helical traveling-wave tube structures

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Computational investigation of experimental interaction impedance obtained by perturbation for helical traveling-wave tube structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dayton Jr., James A. Kory, Carol L.
Copyright Year	1997
Description	Conventional methods used to measure the cold-test interaction impedance of helical slow-wave structures involve perturbing a helical circuit with a cylindrical dielectric rod placed on the central axis of the circuit. It has been shown that the difference in resonant frequency or axial phase shift between the perturbed and unperturbed circuits can be related to the interaction impedance. However, because of the complex configuration of the helical circuit, deriving this relationship involves-several approximations. With the advent of accurate three- dimensional helical circuit models, these standard approximations can be fully investigated. This paper addresses the most prominent approximations made in the analysis for measured interaction impedance by Lagerstrom and investigates their accuracy using the three-dimensional simulation code MAFIA. It is shown that a more accurate value of interaction impedance can be obtained by using three-dimensional computational methods rather than performing costly and time consuming experimental cold-test measurements.
File Size	947881
Page Count	34
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19990004615
Archival Resource Key	ark:/13960/t7gr1v87b
Language	English
Publisher Date	1997-01-01
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Frequency Shift Traveling Wave Tubes Phase Shift Resonant Frequencies Dimensional Analysis Cylindrical Bodies Computerized Simulation Dielectrics Perturbation Impedance Three Dimensional Models Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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