Title :
Effect of conductive perturber diameter on nonresonant measurement of interaction impedance for helical slow-wave structures
Author :
Jung, Sun-Shin ; Soukhov, Andrei V. ; Park, Gun-Sik
Author_Institution :
Vacuum Electrophys. Lab., Seoul Nat. Univ., South Korea
fDate :
9/1/2002 12:00:00 AM
Abstract :
The measurement accuracy of the interaction impedance for a helical slow-wave structure (SWS) using the nonresonant perturbation method has been studied using conductive wire perturbers with different diameters. Data obtained by the measurement were compared with a rigorous numerical analysis. It is shown that the measured values of the interaction impedance for the helical SWS converge to those obtained by using a three-dimensional finite-element computational method when the diameter of the perturber is reduced to less than 10% of the helix diameter
Keywords :
electric impedance measurement; microwave measurement; slow wave structures; 3D finite-element computational method; TWT; conductive perturber diameter; conductive wire perturbers; helical slow-wave structure; interaction impedance; measurement accuracy; nonresonant perturbation measurement; traveling-wave tube; Boundary conditions; Conductivity measurement; Dielectric measurements; Impedance measurement; Laboratories; Physics; Power system harmonics; Propagation constant; Tellurium; Wire;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2002.802335
