Higher-order-mode absorbers for energy recovery linac cryomodules at Brookhaven National Laboratory

Journal Article · Fri Dec 03 04:00:00 EST 2010 · Physical Review Special Topics - Accelerators and Beams

DOI:https://doi.org/10.1103/PhysRevSTAB.13.121002· OSTI ID:1014337

Hahn, H; Ben-Zvi, I; Calaga, R; Hammons, L; Johnson, E C; Kewisch, J; Litvinenko, V N; Xu, W

Several future accelerator projects at Brookhaven for the Relativistic Heavy Ion Collider (RHIC) are based on energy recovery linacs (ERLs) 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. Strong HOM damping was experimentally demonstrated both at room and at superconducting (SC) temperatures in a prototype research and development (R&D) five-cell niobium superconducting rf (SRF) cavity with ferrite dampers. Two room-temperature mock-up five-cell copper cavities were used to study various damper configurations with emphasis on capacitive antenna dampers. An innovative type of ferrite damper over a ceramic break for an R&D SRF electron gun also was developed. For future SRF linacs longer cryomodules comprised of multiple superconducting cavities with reasonably short intercavity transitions 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. This paper presents the results of simulations and measurements of several damper configurations.

• Research Organization: Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider
• Sponsoring Organization: DOE - OFFICE OF SCIENCE
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1014337
• Report Number(s): BNL--94538-2011-JA; KB0202011
• Journal Information: Physical Review Special Topics - Accelerators and Beams, Journal Name: Physical Review Special Topics - Accelerators and Beams Journal Issue: 12 Vol. 13; ISSN 1098-4402
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
ANTENNAS
BNL
CAVITIES
CERAMICS
CONFIGURATION
COPPER
CRYOGENICS
DAMPING
ELECTRON BEAMS
ELECTRON GUNS
ENERGY RECOVERY
FERRITE
HEAVY IONS
LINEAR ACCELERATORS
NIOBIUM
relativistic heavy ion collider