Fast Switching Ferroelectric Materials for Accelerator Applications
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.
Cite
@article{arxiv.physics/0612240,
title = {Fast Switching Ferroelectric Materials for Accelerator Applications},
author = {A. Kanareykin and E. Nenasheva and V. Yakovlev and A. Dedyk and S. Karmanenko and A. Kozyrev and V. Osadchy and D. Kosmin and P. Schoessow and A. Semenov},
journal= {arXiv preprint arXiv:physics/0612240},
year = {2008}
}
Comments
7 pages, 6 figures, submitted to Proceedings of 2006 Advanced Accelerator Concepts Workshop