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Computational Investigation of Experimental Interaction Impedance Obtained by Perturbation for Helical Traveling Wave Tube Structures
- Source :
- IEEE Transactions on Electron Devices. 45(9)
- Publication Year :
- 1998
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1998.
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Abstract
- 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 (3-D) 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 3-D simulation code MAFIA. It is shown that a more accurate value of interaction impedance can be obtained by using 3-D computational methods rather than performing costly and time consuming experimental cold-test measurements.
- Subjects :
- Electronics And Electrical Engineering
Subjects
Details
- Language :
- English
- ISSN :
- 00189383
- Volume :
- 45
- Issue :
- 9
- Database :
- NASA Technical Reports
- Journal :
- IEEE Transactions on Electron Devices
- Notes :
- RTOP 632-50-05
- Publication Type :
- Report
- Accession number :
- edsnas.19990032169
- Document Type :
- Report
- Full Text :
- https://doi.org/10.1109/16.711375