Speaker
Description
SRF technology enables particle accelerators to operate with greater average beam currents and higher duty cycles. In these regimes parasitic excitation of the cavity High Order Mode (HOM) spectrum becomes the limiting factor due to extra RF losses and instabilities appearing in the beam. We discussed the practical limitations imposed by HOMs for large accelerator projects, such as the Large Hadron Collider (LHC) and the KEK-B factory. A new compact HOM damper concept is proposed providing good HOM suppression. The idea is based on an oversized coaxial line with radial sections, which is directly connected to the axial region of the SRF cavity. Such radially sectioned coaxial works as a filter for the operating mode, while being transparent for the HOMs. Implementations of this design for the accelerating and crab cavities developed for the upgrade of the Main Injector (MI) at Fermilab and the Electron Ion Collider (EIC) at Brookhaven, respectively, are presented in detail.
Funding Agency
This work was supported by the U.S. Department of Energy, Office of Science. This manuscript has been authored by Fermi Forward Discovery Group, LLC under Contract No. DE-AC02-07CH11359 with the U.S
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