Open AccessFerrite HOM Absorber for the RHIC ERL
Author(s) -
Horst Hahn,
E. Choi,
L. Hammons
Publication year - 2008
Language(s) - English
Resource type - Reports
DOI - 10.2172/939995
Subject(s) - ferrite (magnet) , materials science , superconductivity , nuclear engineering , debye , linear particle accelerator , composite material , permeability (electromagnetism) , damper , copper , nuclear magnetic resonance , physics , optics , condensed matter physics , metallurgy , thermodynamics , chemistry , engineering , beam (structure) , biochemistry , membrane
A superconducting Energy Recovery Linac is under construction at Brookhaven National Laboratory to serve as test bed for RHIC upgrades. The damping of higher-order modes in the superconducting five-cell cavity for the Energy-Recovery linac at RHIC is performed exclusively by two ferrite absorbers. The ferrite properties have been measured in ferrite-loaded pill box cavities resulting in the permeability values given by a first-order Debye model for the tiled absorber structure and an equivalent permeability value for computer simulations with solid ring dampers. Measured and simulated results for the higher-order modes in the prototype copper cavity are discussed. First room-temperature measurements of the finished niobium cavity are presented which confirm the effective damping of higher-order modes in the ERL. by the ferrite absorbers
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