Speaker
Description
An optimized design of a Ferroelectric Fast Reactive Tuner (FE-FRT) capable of modulating high reactive power in 1.3 GHz superconducting radiofrequency (SRF) TESLA-type cavities at the Mainz Energy-Recovering Superconducting Accelerator (MESA) on sub-microsecond time scales is presented. To mitigate microphonics-induced detuning of up to ±25 Hz in these cavities, the FE-FRT employs low-loss ferroelectric materials with sub-microsecond response times, enabling rapid frequency control without mechanical deformation while handling substantial reactive power delivered by the cavity. The proposed design effectively dissipates the heat generated in the ferroelectric wafers internally, using the exhaust radiation-shield vapor for cooling, and incorporates electrical and mechanical optimizations to improve the FE-FRT Figure of Merit. In addition, it is shown that implementing the FE-FRT in Free-Electron Laser facilities such as MESA can reduce the required peak forward RF power by about an order of magnitude. An analytical model of an FE-FRT with a 50 Hz tuning range, validated through finite-element simulations, demonstrates the feasibility and performance of this technology for SRF cavities.
Footnotes
Superconductivity, radiofrequency, cavity, tuner, microphonics, finite-element simulations
Funding Agency
This work is supported by the BMBF under the research grants 05H24UM1.
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