Ferroelectric based technologies for high power RF and accelerator applications

Abstract

We present recent results on development of BST based ferroelectric compositions synthesized for use in high power technology components for X-band and Ka-band RF systems and offer significant advantages for high power RF manipulation in the 300¿1000 MHz frequency range as well. These low loss ferroelectric materials can be used as key elements of both tuning and phase shifting components. Fast, electrically-controlled ferroelectric RF switches and phase shifters are under development for different accelerator applications in X, Ka and L - frequency bands either. The exact design of such a devise depends on the electrical parameters of particular ferroelectric material to be used, namely its dielectric constant, loss tangent and tunability. We have identified BST based ferroelectric-oxide compounds as suitable materials for a fast electrically-controlled 700 MHz, 50 kW tuner for Brookhaven National Lab and for high-power fast RF phase shifters to be used for SNS, Oakridge National Lab vector modulation applications. The bulk ferroelectric based phase shifter will allow coupling adjustment and control of the power consumption during the process of SC cavity filling, which is of great importance for the Intl. Linear Collider (ILC) program. New methods were developed in order to measure parameters of large ferroelectric components. The results of measurements are presented.