Title :
Ferrite-lined hom absorber for the e-cool erl
Author :
Hahn, H. ; Hammons, L. ; Naik, D.
Author_Institution :
Brookhaven Nat. Lab., Upton
Abstract :
An R&D Energy Recovery Linac (ERL) intended as step towards electron-cooling of RHIC-II is being constructed at this laboratory. The center piece of the project is the experimental 5-cell 703.75 MHz superconducting "ECX" cavity. Successful operation will depend on effective HOM suppression, and it is planned to achieve HOM damping exclusively with room temperature ferrite absorbers. A ferrite-lined pillbox test model with dimensions reflecting the operational unit was assembled and attached to the 5-cell copper cavity. The cavity resonances of the lowest dipole and monopole modes and their damping due to the ferrite were determined. The effective ferrite properties in a form portable to other structures were obtained from network analyzer measurements of the ferrite absorber models and their interpretation with the simulation code Microwave Studio.
Keywords :
accelerator cavities; beam handling techniques; cooling; copper; electron accelerators; ferrites; ion beams; linear accelerators; 5-cell copper cavity; E-Cool ERL; Electron-Cooling Xperiment; Energy Recovery Linac; RHIC-II; dipole modes; electron-cooling; ferrite-lined HOM absorber; ferrite-lined pillbox test model; higher order mode suppression; monopole modes; superconducting ECX cavity; Assembly; Copper; Damping; Ferrites; Laboratories; Linear particle accelerator; Resonance; Superconducting microwave devices; Temperature dependence; Testing;
Conference_Titel :
Particle Accelerator Conference, 2007. PAC. IEEE
Conference_Location :
Albuquerque, NM
Print_ISBN :
978-1-4244-0916-7
DOI :
10.1109/PAC.2007.4440540
