R&D ERL: HOM Absorbers

Technical Report · Fri Jan 01 04:00:00 EST 2010

DOI:https://doi.org/10.2172/1013446· OSTI ID:1013446

Hahn, H; Ben-Zvi, I; Calaga, R; Hammons, L; Litvinenko, V N; Xu, W

Several future accelerator projects at the Relativistic Heavy Ion Collider (RHIC) are based on Energy Recovery Linacs (ERL) with high-charge high-current electron beams. Their stable operation mandates effective higher-order-mode (HOM) damping. The development of HOM dampers for these projects is pursued actively at this laboratory. A strong HOM damping was experimentally demonstrated both at room- and at superconducting- (SC) temperatures in a prototype R&D five-cell niobium SRF cavity with ferrite dampers. A novel type of ferrite damper over a ceramic break for a R&D SRF electron gun also was developed. For future SRF linacs longer cryomodules comprising of multiple superconducting cavities with reasonably short transitions between them are planned. In such a configuration, the dampers, located closer to the cavities, will be at cryogenic temperatures; this will impose additional constraints and complications. Two room-temperature mock-up five-cell copper cavities were used to study various damper configurations. This paper presents results of simulations and measurements for several configurations.

• Research Organization: Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
• Sponsoring Organization: DOE - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1013446
• Report Number(s): BNL--90923-2010-IR; KB0202011
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
CERAMICS
CONFIGURATION
COPPER
CRYOGENICS
DAMPING
ELECTRON BEAMS
ELECTRON GUNS
ENERGY RECOVERY
FERRITE
HEAVY IONS
LINEAR ACCELERATORS
NIOBIUM
RF SYSTEMS
SUPERCONDUCTING CAVITY RESONATORS
relativistic heavy ion collider