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Effect of conductive perturber diameter on nonresonant measurement of interaction impedance for helical slow-wave structures

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3 Author(s)
Jung, Sun-Shin ; Vacuum Electrophys. Lab., Seoul Nat. Univ., South Korea ; Soukhov, Andrei V. ; Gun-Sik Park

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

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 9 )