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

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 thes...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2010-12, Vol.13 (12), p.121002, Article 121002
Main Authors: Hahn, H., Ben-Zvi, I., Calaga, R., Hammons, L., Johnson, E. C., Kewisch, J., Litvinenko, V. N., Xu, Wencan
Format: Article
Language:English
Subjects:
ACCELERATORS
ANTENNAS
BNL
CAVITIES
CERAMICS
CONFIGURATION
Configurations
COPPER
Cryogenic temperature
CRYOGENICS
Dampers
DAMPING
ELECTRON BEAMS
ELECTRON GUNS
ENERGY RECOVERY
FERRITE
Ferrites
HEAVY IONS
Holes
Laboratories
LINEAR ACCELERATORS
NIOBIUM
PARTICLE ACCELERATORS
R&D
Relativistic Heavy Ion Collider
Research & development
Room temperature
Superconductivity
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Summary: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.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.13.121002