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Fast Switching Ferroelectric Materials for Accelerator Applications

A. Kanareykin·E. Nenasheva·V. Yakovlev·A. Dedyk·S. Karmanenko·A. Kozyrev·V. Osadchy·D. Kosmin·P. Schoessow·A. Semenov
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Abstract

Fast switching (< 10 nsec) measurement results on the recently developed BST(M) (barium strontium titanium oxide composition with magnesium-based additions) ferroelectric materials are presented. These materials can be used as the basis for new advanced technology components suitable for high-gradient accelerators. A ferroelectric ceramic has an electric field-dependent dielectric permittivity that can be altered by applying a bias voltage. Ferroelectric materials offer significant benefits for linear collider applications, in particular, for switching and control elements where a very short response time of <10 nsec is required. The measurement results presented here show that the new BST(M) ceramic exhibits a high tunability factor: a bias field of 40-50 kV/cm reduces the permittivity by a factor of 1.3-1.5. The recently developed technology of gold biasing contact deposition on large diameter (110 cm) thin wall ferroelectric rings allowed ~few nsec switching times in witness sample experiments. The ferroelectric rings can be used at high pulsed power (tens of megawatts) for X-band components as well as at high average power in the range of a few kilowatts for the L-band phase-shifter, under development for optimization of the ILC rf coupling. Accelerator applications include fast active X-band and Ka-band high-power ferroelectric switches, high-power X-band and L-band phase shifters, and tunable dielectric-loaded accelerating structures.

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A. Kanareykin, E. Nenasheva, V. Yakovlev, A. Dedyk, S. Karmanenko, A. Kozyrev, V. Osadchy, D. Kosmin, P. Schoessow, A. Semenov. 2006-12-27. Fast Switching Ferroelectric Materials for Accelerator Applications. https://doi.org/10.1063/1.2409151

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