| Paper |
Title |
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| THP030 |
Investigation of Ferroelectrics for High-Power RF Phase Shifters in Accelerator Systems
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637 |
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- Y. W. Kang, J. L. Wilson
ORNL, Oak Ridge, Tennessee
- A. E. Fathy
University of Tennessee, Knoxville, Tennessee
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High power vector modulators enable independent control of RF power to each accelerating cavity, allowing a fan-out configuration to be used to power many cavities from a single high-power klystron. Previously, ferrite materials have been used in high-power phase shifters and vector modulators. It is shown that ferroelectric materials such as barium-strontium titanate (BST) can also be used in such tunable structures. Since ferroelectrics are controlled by an electric, rather than magnetic field, tuning can be faster than tuning a ferrite-loaded device. A BST-loaded coaxial structure is investigated theoretically and experimentally. Good high voltage performance is critical since DC biasing voltages of up to 80 kV can be impressed on the BST sections for tuning. It can also be seen that matching structures around the BST can improve performance over a wider range of amplitudes and phases.
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