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Thisisrpreprintofrpinteuded for publication ina journalorpmceedings. Since changes may be made before publication, this preprint is made available with the understandmg titat it will not be cited or reproduced without the permission of the author.

Recent high-voltage breakdown experiments of pericdc metallic-dielectric insulating structures have suggested several interesting high-gradient applications. One such area is the employment of high-gradient insulators in high-current, electron-beam, accelerating induction modules. For this application, the understandhg of the rf characteristics of the insulator plays an important role in estimating beam-cavity interactions. In this paper, we examine the rf properties of the insulator comparing simulation results with experiment. Different insulator designs are examined to determine their rf transmission properties in gap geometries.

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