Dresden 2026 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 14: RF Cavities II
AKBP 14.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, SCH/A117
Design of a fast reactive tuner for 1.3 GHz TESLA cavities at MESA — •Ricardo Monroy-Villa1, Ilan Ben-Zvi2, Florian Hug1, and Timo Stengler1 — 1Institute for Nuclear Physics, Johannes Gutenberg-Universität Mainz, Mainz, Germany — 2Physics and Astronomy Department, Stony Brook University, New York, USA
We present a state-of-the-art design of a Ferroelectric Fast Reactive Tuner (FE-FRT), capable of modulating high reactive power in TESLA-type cavities on a microsecond time scale. The Mainz Energy-Recovering Superconducting Accelerator employs 1.3 GHz superconducting radio-frequency (SRF) cavities, achieving quality factors of the order of 10^10. However, detuning of 25 Hz induced by microphonics has led to the use of strong coupling for the fundamental power coupler, requiring high-power amplifiers, orders of magnitude above the intrinsic dissipation. Current solutions to mitigate microphonics rely on piezoelectric tuners, which are not fast enough for the spectral range of the microphonics. A novel alternative is the FE-FRT, a technology made possible by low-loss ferroelectric materials, which offer sub-microsecond response times. Analytical results are provided along with their validation through finite-element simulations. The FE-FRT can handle substantial reactive power while offering a tuning range of 50 Hz in SRF cavities, resulting in a reduction in peak forward RF power by about an order of magnitude.
Keywords: Ferroelectric fast reactive tuner; Detuning; SRF cavities; RF superconductivity; Microphonics