Abstract

The coupled bunch mode n=16 longitudinal instability observed in the Fermilab Booster has been successfully damped by installing a set of passive higher-order mode (HOM) dampers in the 17 Booster RF cavities. The Booster is a fast cycling 8 GeV proton synchrotron with harmonic number 84. The dampers remove energy from two cavity modes at 165 and 217 MHz. The addition of these dampers to the RF cavities has reduced the longitudinal emittance of high current beams at extraction by a factor of 3. The mode dampers will be described along with beam spectra and data showing the longitudinal emittance reduction. >

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