Ferrite HOM Absorber for the RHIC ERL

Hahn,H. ; Choi, E.M. ; Hammons, L.

Brookhaven National Laboratory

关键词: Copper;    Permeability;    Cavities;    43 Particle Accelerators;    Computerized Simulation;   

DOI  :  10.2172/939995
RP-ID  :  BNL--81608-2008-IR
RP-ID  :  DE-AC02-98CH10886
RP-ID  :  939995

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.