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Description
An improved TM020-mode RF cavity has been developed for the collider rings of the Super Tau-Charm Facility (STCF). By utilizing a higher TM020-mode for beam acceleration, this cavity has a lower R/Q = 83.5 Ω and a higher unloaded Q = 61300, compared with conventional TM010-mode cavities. These characteristics help reduce the required detuning frequency and significantly suppress coupled-bunch instabilities (CBIs) driven by the accelerating mode. The optimized cavity operates at 499.7 MHz and provides an effective accelerating voltage Va= 0.6 MV. An elliptical choke is employed to reduce leakage power, achieving less than 2% power loss in the accelerating mode. In addition, harmful parasitic modes other than the TM020-mode are effectively suppressed by positioning the elliptical choke at the magnetic node of the operating mode. After fabrication, the cavity prototype was precisely tuned, and low-power RF measurements were performed. The measured results show good agreement with the simulations, confirming the performance of the improved TM020-mode cavity.
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