Speakers
Description
In the Electron–Ion Collider (EIC), we plan to use 24.6 MHz normal-conducting cavities to provide 600 kV in the Hadron Storage Ring (HSR) for beam capture, acceleration, and transition crossing. The existing four 28 MHz cavities have been operating in RHIC for more than twenty years. To reduce costs, we will reuse their large outer conductor, power amplifier, and associated components for the 24.6 MHz system. We designed new inner conductors, HOM dampers, and increased the number of ferrite fast tuners to four. The cavity parameters of the fundamental mode at 24.631 MHz have been optimized. Two mechanical tuners provide a tuning range from −160 kHz to +40 kHz relative to the nominal 24.631 MHz. The four fast ferrite tuners enable approximately 20 kHz of tuning on the millisecond timescale. The HOM impedances are optimized to remain within the beamline impedance budget. The HOM power was calculated considering various hadron beam parameters—including ion species, charge, and bunch number—and the worst-case power absorbed by the HOM dampers was further evaluated. Frequency shifts arising from fabrication tolerances were estimated and will be compensated during final tuning. Multiphysics simulations were performed to analyze RF-induced thermal distributions and the water-cooling circuits.
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