HOM absorbers for ERL cryomodules at BNL

Conference · Sun Sep 20 04:00:00 EDT 2009

OSTI ID:967353

Hahn, H; Ben-Zvi, I; Hammons, L; Xu, W

The physics needs and technical requirements for several future accelerator projects at the Relativistic Heavy Ion Collider (RHIC) all involve electron Energy Recovery Linacs (ERL). The required high-current, high-charge operating parameters make effective higher-order-mode (HOM) damping mandatory and the development of HOM dampers for a prototypical five-cell cavity is actively pursued. An experimental five-cell niobium cavity with ferrite dampers has been constructed, and effective HOM damping has been demonstrated at room and superconducting (SC) temperatures. A novel type of ferrite damper around a ceramic break has been developed for the ERL electron gun and prototype tests are also reported. Contemplated future projects are based on assembling a chain of superconducting cavities in a common cryomodule with the dampers placed in the cold space between the cavities, imposing severe longitudinal space constraints. Various damper configurations have been studied by placing them between two five-cell copper cavities. Measured and simulated copper cavity results, external Q-values of possible dampers and fundamental mode losses are presented.

• Research Organization: Brookhaven National Laboratory
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 967353
• Report Number(s): BNL--82392-2009-CP; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
CAVITIES
CERAMICS
COPPER
DAMPING
ELECTRON GUNS
ELECTRONS
ENERGY RECOVERY
FERRITE
HEAVY IONS
LINEAR ACCELERATORS
NIOBIUM
PHYSICS
SUPERCONDUCTIVITY