Ferrite HOM Absorber for the RHIC ERL

[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.

[发布日期] 2008-10-01

[学科分类] 核物理和高能物理

[关键词] BNL;CAVITIES;COMPUTERIZED SIMULATION;CONSTRUCTION;COPPER;DAMPING;ENERGY RECOVERY;FERRITE;LINEAR ACCELERATORS;NIOBIUM;PERMEABILITY