Ferroelectric based technologies for accelerator component applications

We present recent results on development of BST(M) ferroelectric compositions synthesized for use in advanced technology components for X-band and Ka- band RF systems in high gradient accelerators 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. We have identified BST ferroelectric-oxide compounds as suitable materials for a fast electrically-controlled 700 MHz, 50 kW tuner for ERL (BNL) and for high-power fast RF phase shifters to be used for SNS vector modulation applications. We have also developed large diameter (11 cm) BST(M)-based ferroelectric rings planned to be used at high average power (10 kW range) for L-band phase- shifters intended for the ILC. This phase shifter will allow coupling adjustment and control of the power consumption during the process of SC cavity filling.