Speakers
Description
Ferrite fast tuner enables accelerating voltage phase modulation in sub-millisecond during the gamma jump coordinating with magnet lattice to keep longitudinal stability of the beam. Due to the three times higher beam current in hardon storage ring (HSR) of Electron-Ion Collider (EIC) than that in RHIC, the beam loading induced frequency detuning will be also multiplied. Hence a higher performance of the fast tuner is required for 24.6 MHz accelerating cavity in EIC. The existing ferrite tuner in 28 MHz cavity in RHIC has a tuning range of 4 kHz with DC bias from 5 to 55 Amps and power dissipation up to 2 kW. To improve this ferrite tuner design for 24.6 MHz cavity, we characterized the permeability and hysteresis loops of the M4C21 Nickl-Zinc ferrite toroid with and without DC current bias. A full RF simulation of the cavity coupled with the tuner was performed. The equivalent circuit models and transmission line theory are applied to interpret and improved the frequency tuning range and power dissipation.
Funding Agency
Work supported by Brookhaven Science Associates, LLC under U.S. DOE contract No. DE-SC0012704, by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-SC0002769, and by DOE Contract No. DE
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