| Paper |
Title |
Page |
| MOPP093 |
Fast L-band Waveguide Phase Shifter
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769 |
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- S. Kazakov, S. V. Shchelkunov
Omega-P, Inc., New Haven, Connecticut
- J. L. Hirshfield
Yale University, Physics Department, New Haven, CT
- A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio
- E. Nenasheva
Ceramics Ltd., St. Petersburg
- V. P. Yakovlev
Fermilab, Batavia, Illinois
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During the operation of accelerators it is often important to rapidly change the parameters of the RF system, such as cavity resonant frequency, coupling, or electrical length. For this purpose a fast L-band planar phase shifter has been designed, that has advantages compared to the coaxial scheme considered before by the authors (EPAC 06). The phase shifter is based on a new ferroelectric ceramic, whose permittivity changes with application of an external voltage. The switching time depends on only the external HV circuit and can by less than a few microseconds. The conceptual design and electrical parameters of the new phase shifter are presented, as are first results of low power measurements on a 1/3 model.
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| TUPP046 |
Tunable Ferroelectric Based Technologies for Accelerator Components
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1646 |
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- A. Kanareykin
Euclid TechLabs, LLC, Solon, Ohio
- S. Kazakov
KEK, Ibaraki
- E. Nenasheva
Ceramics Ltd., St. Petersburg
- A. Tagantsev
EPFL, Lausanne
- V. P. Yakovlev
Fermilab, Batavia, Illinois
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Low loss ferroelectric materials can be used as key elements in RF tuning and phase shifting components to provide fast, electronic control. These devices are under development for different accelerator applications in X, Ka and L - frequency bands. The exact design of these devices depends on the electrical parameters of the particular ferroelectric material to be used- its dielectric constant, loss tangent and tunability. BST based ferroelectric-oxide compounds have been found to be suitable materials for a fast electrically-controlled tuner for BNL and for high-power fast RF phase shifters to be used for SNS vector modulation applications. We present recent results on the development of BST based ferroelectric compositions synthesized for use in high power technology components. The BST(M) ferroelectrics have been tested using a transverse dc bias field. The tunability factor vs. dc field magnitude has been evaluated and the feasibility of transverse bias tuning for ferroelectric based accelerator components has been demonstrated.
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